CN113951989B - Flexible shearing device and application method thereof - Google Patents
Flexible shearing device and application method thereof Download PDFInfo
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- CN113951989B CN113951989B CN202111189760.8A CN202111189760A CN113951989B CN 113951989 B CN113951989 B CN 113951989B CN 202111189760 A CN202111189760 A CN 202111189760A CN 113951989 B CN113951989 B CN 113951989B
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/32—Surgical cutting instruments
- A61B17/320016—Endoscopic cutting instruments, e.g. arthroscopes, resectoscopes
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/04—Surgical instruments, devices or methods, e.g. tourniquets for suturing wounds; Holders or packages for needles or suture materials
- A61B17/0467—Instruments for cutting sutures
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/04—Surgical instruments, devices or methods, e.g. tourniquets for suturing wounds; Holders or packages for needles or suture materials
- A61B17/0469—Suturing instruments for use in minimally invasive surgery, e.g. endoscopic surgery
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/32—Surgical cutting instruments
- A61B17/3201—Scissors
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Abstract
The invention discloses a flexible shearing device and a use method thereof, comprising the following steps: an actuator that intervenes in human tissue to shear the medical element; an operating mechanism for controlling the movement of the actuator to switch the actuator between a sheared state and a non-sheared state; the device also comprises a flexible connecting mechanism, wherein one end of the flexible connecting mechanism is connected with the executing mechanism, the other end of the flexible connecting mechanism is connected with the operating mechanism, and the control action of the operating mechanism is transmitted to the executing mechanism through the flexible connecting mechanism so as to control the executing state of the executing mechanism. The invention adopts a flexible connection mode and can be suitable for complex human tissue structures; the lever principle is adopted, the shearing process is labor-saving, the deformation of the flexible connecting mechanism is reduced, and the operation synchronism is improved; the length of the redundant line can be shortened by reasonably setting the knife edge position; the shearing principle is adopted instead of the extrusion principle, so that the knife edge can be protected, the shearing effect on the ductile material is improved, and the service life of the instrument is prolonged.
Description
Technical Field
The invention relates to the technical field of medical equipment, in particular to a flexible shearing device and a using method thereof.
Background
In the field of human tissue interventional repair, especially in the field of heart valve repair, some implantation apparatuses have a wire and thin rod structure, and after a specific operation is completed in the operation process, the redundant wire and thin rod structure needs to be sheared off under an interventional condition. Due to space constraints in transvascular interventions and the like, the size of the instrument required to provide the shearing operation is very small. Although the current rigid rod driven instrument structure can cope with the shearing work of medical elements in minimally invasive surgery, the current rigid instruments cannot complete the shearing work of the elements in environments such as long-distance vascular intervention surgery. Thus, a new instrument is urgently needed to solve the above-mentioned problems.
Disclosure of Invention
In order to overcome the problems, the invention provides a flexible shearing device and a using method thereof. The flexible connection mode is adopted, so that the flexible connection type shear device can be suitable for complex human tissue structures, overcomes the defects of the existing rigid instrument, and improves the shearing quality under the condition of completing the shearing task. The lever principle is adopted, so that the shearing process is labor-saving, the deformation of the flexible connecting mechanism is reduced, and the operation synchronism is improved. The length of the redundant line can be shortened by reasonably setting the knife edge position. The shearing principle is adopted instead of the extrusion principle, so that the knife edge can be protected, the shearing effect on the ductile material is improved, and the service life of the instrument is prolonged.
To achieve the above object, according to an aspect of an embodiment of the present invention, there is provided a flexible shearing device including:
an actuator that intervenes in human tissue to shear the medical element;
an operating mechanism for controlling the movement of the actuator to switch the actuator between a sheared state and a non-sheared state;
the device also comprises a flexible connecting mechanism, wherein one end of the flexible connecting mechanism is connected with the executing mechanism, the other end of the flexible connecting mechanism is connected with the operating mechanism, and the control action of the operating mechanism is transmitted to the executing mechanism through the flexible connecting mechanism so as to control the executing state of the executing mechanism.
Optionally, the executing mechanism comprises a lower cutter, an upper cutter and a base;
the lower cutter is fixedly connected to one end of the base, and a rotating shaft is arranged on the top surface of the lower cutter;
the upper knife is pivoted with the lower knife through the rotating shaft, the flexible connecting mechanism is connected with one end of the upper knife, and the operating mechanism controls the upper knife to rotate along the rotating shaft through the flexible connecting mechanism so as to control the execution state of the executing mechanism.
Optionally, the upper knife and the lower knife are respectively provided with a wire passing hole, and the medical element is positioned between the upper knife cutting edge of the upper knife and the lower knife cutting edge of the lower knife after passing through the wire passing holes;
when the medical element is sheared, the length of a force arm from the contact point between the medical element and the upper blade opening to the rotating shaft is C1;
the length of a force arm from a connecting point between the flexible connecting mechanism and one end of the upper cutter to the rotating shaft is C2;
and C1 is smaller than C2.
Optionally, the lower knife is provided with an avoidance groove for accommodating the medical element and the upper knife edge in the shearing process;
the upper blade opening and the lower blade opening are in dislocation closure, and when the medical element is sheared, the medical element is broken through dislocation closure of the upper blade opening and the lower blade opening.
Optionally, when the upper blade opening and the lower blade opening are closed, a distance between the upper blade opening and an end surface of the lower blade where the wire passing hole is located is smaller than or equal to a diameter of the medical element.
Optionally, the flexible connection mechanism comprises a flexible synchronous tube and a flexible sheath tube;
the flexible synchronous tube is arranged in the flexible sheath tube and can move in the flexible sheath tube; one end of the flexible synchronous tube is connected with the executing mechanism, and the other end of the flexible synchronous tube is connected with the operating mechanism, so that the operating mechanism synchronously controls the executing mechanism through the flexible synchronous tube, and further controls the executing state of the executing mechanism;
one end of the flexible sheath tube is connected with the actuating mechanism, and the other end of the flexible sheath tube is connected with the operating mechanism and provides support for the flexible synchronous tube.
Optionally, the flexible connection mechanism comprises a flexible synchronous tube and a flexible sheath tube;
the flexible synchronous tube is arranged in the flexible sheath tube and can move in the flexible sheath tube; one end of the flexible synchronous tube is connected with the traction arm of the upper cutter, and the other end of the flexible synchronous tube is connected with the operating mechanism, so that the operating mechanism can control the upper cutter to rotate by pulling the flexible synchronous tube, and further control the execution state of the executing mechanism;
one end of the flexible sheath tube is connected with the end part of the base, which is far away from the lower knife, and the other end of the flexible sheath tube is connected with the operating mechanism and provides support for the flexible synchronous tube.
Optionally, the operating mechanism comprises a shell, and sliding grooves are formed in the left side and the right side of the shell; the shell is also internally provided with a front seat, a rear seat and a handle mechanism;
the front seat is fixedly arranged in the shell, and one end of the front seat, which is close to the executing mechanism, is connected with the flexible sheath;
the rear seat is arranged in the shell, the flexible synchronous tube penetrates through the axial inner hole of the front seat and then is connected with one end of the rear seat, and the other end of the rear seat is connected with the handle mechanism; the rear seat can slide along sliding grooves formed in the left side and the right side of the shell, and the handle mechanism drives the rear seat to reciprocate along the sliding grooves so as to control the flexible synchronous tube to move back and forth.
Optionally, the handle mechanism comprises a connecting rod, a spanner and a tension spring;
the wrench is rotationally connected to the shell, one side of the part of the wrench, which is positioned in the shell, is connected with the tension spring, the other end of the tension spring is fixed in the shell, and the tension spring is used for controlling the handle mechanism to reset; the other side of the part of the wrench in the shell is connected with one end of a connecting rod, and the other end of the connecting rod is connected with the end part of the rear seat, which is far away from the actuating mechanism.
Optionally, the length of a force arm between an external force acting point on the wrench and a rotation connecting point of the wrench and the shell is L1,
the length of the arm of force between the connecting rod and the rotational connection point of the wrench and the shell is L2,
l1 is greater than L2.
According to a second aspect of embodiments of the present invention, there is provided a method of using a flexible shearing device, comprising:
an actuator that intervenes in human tissue to shear the medical element;
an operating mechanism for controlling the movement of the actuator to switch the actuator between a sheared state and a non-sheared state;
the device also comprises a flexible connecting mechanism, wherein one end of the flexible connecting mechanism is connected with the executing mechanism, and the other end of the flexible connecting mechanism is connected with the operating mechanism;
during shearing, the control action of the operating mechanism is transmitted to the executing mechanism through the flexible connecting mechanism so as to control the executing state of the executing mechanism.
Optionally, in the using method, the executing mechanism includes a lower cutter, an upper cutter and a base;
the lower cutter is fixedly connected to one end of the base, and a rotating shaft is arranged on the top surface of the lower cutter;
the upper knife is pivoted with the lower knife through the rotating shaft, the flexible connecting mechanism is connected with one end of the upper knife, and the operating mechanism controls the upper knife to rotate along the rotating shaft through the flexible connecting mechanism so as to control the execution state of the executing mechanism.
Optionally, in the using method, the upper knife and the lower knife are respectively provided with a wire passing hole, and the medical element passes through the wire passing holes and is positioned between the upper knife cutting edge of the upper knife and the lower knife cutting edge of the lower knife;
when the medical element is sheared, the length of a force arm from the contact point between the medical element and the upper blade opening to the rotating shaft is C1;
the length of a force arm from a connecting point between the flexible connecting mechanism and one end of the upper cutter to the rotating shaft is C2;
the C1 is smaller than the C2 so as to reduce the shearing operation force.
Optionally, in the using method, the lower knife is provided with an avoidance groove for accommodating the medical element and the upper knife edge in the shearing process;
the upper blade opening and the lower blade opening are in dislocation closure, when the medical element is sheared, the medical element is broken through the dislocation closure of the upper blade opening and the lower blade opening, and the part of the medical element to be moved out of human tissue and the upper blade opening enter the avoidance groove.
Optionally, when the upper knife edge and the lower knife edge are closed in the using method, the distance between the upper knife edge and the end face of the wire passing hole on the lower knife is smaller than or equal to the diameter of the medical element.
Optionally, in the using method, the flexible connection mechanism includes a flexible synchronization tube and a flexible sheath tube;
the flexible synchronous tube is arranged in the flexible sheath tube and can move in the flexible sheath tube; one end of the flexible synchronous tube is connected with the executing mechanism, and the other end of the flexible synchronous tube is connected with the operating mechanism, so that the operating mechanism synchronously controls the executing mechanism through the flexible synchronous tube, and further controls the executing state of the executing mechanism;
one end of the flexible sheath tube is connected with the actuating mechanism, and the other end of the flexible sheath tube is connected with the operating mechanism and provides support for the flexible synchronous tube.
Optionally, in the using method, the flexible connection mechanism includes a flexible synchronization tube and a flexible sheath tube;
the flexible synchronous tube is arranged in the flexible sheath tube and can move in the flexible sheath tube; one end of the flexible synchronous tube is connected with the traction arm of the upper cutter, and the other end of the flexible synchronous tube is connected with the operating mechanism, so that the operating mechanism can control the upper cutter to rotate by pulling the flexible synchronous tube, and further control the execution state of the executing mechanism;
one end of the flexible sheath tube is connected with the end part of the base, which is far away from the lower knife, and the other end of the flexible sheath tube is connected with the operating mechanism and provides support for the flexible synchronous tube.
Optionally, in the using method, the operating mechanism includes a casing, and sliding grooves are arranged on the left side and the right side of the casing; the shell is also internally provided with a front seat, a rear seat and a handle mechanism;
the front seat is fixedly arranged in the shell, and one end of the front seat, which is close to the executing mechanism, is connected with the flexible sheath;
the rear seat is arranged in the shell, the flexible synchronous tube penetrates through the axial inner hole of the front seat and then is connected with one end of the rear seat, and the other end of the rear seat is connected with the handle mechanism; the rear seat can slide along sliding grooves arranged on the left side and the right side of the shell;
when the flexible synchronous tube is used, the handle mechanism drives the rear seat to reciprocate along the sliding groove so as to control the flexible synchronous tube to move back and forth, and the working state of the executing mechanism is controlled.
Optionally, in the using method, the handle mechanism comprises a connecting rod, a wrench and a tension spring;
the wrench is rotationally connected to the shell, one side of the part of the wrench, which is positioned in the shell, is connected with the tension spring, the other end of the tension spring is fixed in the shell, and the tension spring is used for controlling the handle mechanism to reset; the other side of the part of the wrench in the shell is connected with one end of a connecting rod, and the other end of the connecting rod is connected with the end part of the rear seat, which is far away from the actuating mechanism.
Optionally, in the using method, the length of a force arm between an external force acting point on the wrench and a rotation connecting point of the wrench and the shell is L1,
the length of the arm of force between the connecting rod and the rotational connection point of the wrench and the shell is L2,
l1 is greater than L2 to reduce the shear operating force.
The technical scheme of the invention has the following advantages or beneficial effects:
(1) The flexible connecting mechanism is adopted to connect the actuating mechanism and the operating mechanism, so that the shearing device is suitable for complex human tissue structures, such as intervention in blood vessels to realize shearing, can be suitable for long-distance shearing operation, and overcomes the defects of the existing rigid instrument. While flexible connecting elements of suitable dimensions may be selected as desired to suit different surgical environments.
(2) The length of the shearing driving force arm is larger than the force arm of the reaction force of the medical element to the upper knife, and the lever principle is adopted, so that the driving force is reduced, and the shearing operation is easier. And further, the acting force of the driving force on the flexible connecting mechanism is reduced, the influence on the operation effect caused by excessive deformation of the flexible mechanism is avoided, and the action synchronism of the operation mechanism and the executing mechanism is improved.
(3) The upper blade opening and the lower blade opening are staggered and closed, so that the driving force required by the shearing process can be reduced relative to the extrusion breaking mode, the abrasion loss of a cutter is reduced, the service life is prolonged, and the shearing is stable and reliable.
(4) The operating mechanism adopts the lever principle to pull the flexible synchronous tube, so that the driving force is reduced, and the acting force on the flexible sheath tube is also reduced. The operation is convenient, and the deformation of the flexible sheath tube is reduced.
(5) The actuating mechanism and the operating mechanism both adopt the lever principle, and the use of the double levers can further reduce the driving external force, further reduce the deformation of the sheath tube, improve the synchronous precision of the operating action of the operating mechanism and improve the shearing effect.
(6) The length of the residual wire can be reduced by controlling the setting position of the upper knife edge, and the shearing quality is improved.
Drawings
The drawings are included to provide a better understanding of the invention and are not to be construed as unduly limiting the invention. Wherein:
FIG. 1 is a schematic view of a main structure of a shearing device according to an embodiment of the present invention;
FIG. 2 is a schematic illustration of an actuator according to an embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of an actuator in a sheared state according to an embodiment of the invention;
FIG. 4 is a schematic cross-sectional view of an actuator according to an embodiment of the invention;
FIG. 5 is a schematic illustration of the crush break principle according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of the shear fracture principle according to an embodiment of the present invention;
FIG. 7 is an exploded schematic view of an operating mechanism according to an embodiment of the present invention;
FIG. 8 is a schematic cross-sectional view of an operating mechanism according to an embodiment of the invention.
Detailed Description
Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, in which various details of the embodiments of the present invention are included to facilitate understanding, and are to be considered merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the invention. Also, descriptions of well-known functions and constructions are omitted in the following description for clarity and conciseness.
According to one aspect of an embodiment of the present invention, a flexible shearing device is provided.
In order to solve the problem of the prior art that rigid minimally invasive surgical instruments cannot cut medical components over long distances, such as cutting out portions of components of instruments that are implanted into the heart through a blood vessel, one embodiment of the present invention provides a flexible cutting device. Medical elements referred to herein include, but are not limited to, wires or rods. Specifically, as shown in fig. 1, the flexible cutting device includes an actuator 101 that intervenes in human tissue to cut medical elements; an actuator 102 for controlling the actuator movement to switch the actuator between a sheared state and a non-sheared state. The operating mechanism may include a wrench or the like to facilitate manual operation of the actuating mechanism by the healthcare worker. The device also comprises a flexible connecting mechanism 103, wherein one end of the flexible connecting mechanism is connected with the actuating mechanism, and the other end of the flexible connecting mechanism is connected with the operating mechanism. The length and the diameter of the flexible connecting mechanism can be adjusted according to the space of the intervening tissues, namely, the modularized design thought can be adopted, so that the shearing device can be suitable for various operation environments. The control action of the operating mechanism is transmitted to the actuating mechanism through the flexible connecting mechanism so as to control the actuating state of the actuating mechanism, such as switching between a shearing state and a non-shearing state.
Optionally, the actuator 101 includes a lower blade 201, an upper blade 204, and a base 203. As shown in fig. 2, the lower knife 201 is fixedly connected to the left end of the base 203, i.e., the end far away from the medical staff. The top surface of the lower blade 201 is provided with a rotation shaft 202. In one embodiment, as shown in fig. 2, the shaft is shown disposed near the middle of the top surface of the lower blade. The upper knife is pivoted with the lower knife through the rotating shaft, the flexible connecting mechanism is connected with one end of the upper knife, and the operating mechanism controls the upper knife to rotate along the rotating shaft through the flexible connecting mechanism so as to control the execution state of the executing mechanism.
Alternatively, as shown in fig. 3 and 4, the upper blade and the lower blade are provided with wire passing holes 401, 402, respectively, through which the medical element 104 passes and is located between the upper blade opening 403 of the upper blade and the lower blade opening 403 of the lower blade. The dashed line in fig. 4 is the motion track of the cutting edge on the upper cutter around the rotating shaft, and the upper cutter cutting edge can realize the dislocation closure with the lower cutting edge, and the closing gap is small enough, so that the shearing quality of the port is improved. When the medical element needs to be sheared, the length of a force arm from the contact point between the medical element and the upper blade opening to the rotating shaft is C1; the length of a force arm from a connecting point between the flexible connecting mechanism and one end of the upper cutter to the rotating shaft is C2; and C1 is smaller than C2. In a certain shearing state as shown in fig. 4, the length of the arm of force from the contact point between the medical element and the upper blade opening to the rotating shaft is C; the length of a force arm from a connecting point between the flexible connecting mechanism and one end of the upper cutter to the rotating shaft is D; the force arm of the shearing drive force arm is longer than the reaction force of the medical element to the upper knife, and the lever principle is adopted, so that the driving force is reduced, and the shearing operation is easier. The driving force is reduced, so that the force of the driving force on the flexible connecting mechanism is reduced, and the operation effect is prevented from being influenced by excessive deformation of the flexible mechanism.
Optionally, as shown in fig. 4, the lower blade is provided with a relief groove 405 for receiving the medical element and the upper blade edge during cutting. In one embodiment, the upper blade opening and the lower blade opening of the invention realize shearing in a staggered closing mode. That is, when the medical element is sheared, the medical element is broken by the dislocation and closure of the upper blade opening and the lower blade opening. Compared with the extrusion fracture mode, the method can reduce the driving force required by the shearing process, reduce the abrasion loss of the cutter and prolong the service life. In practice, shearing is a phenomenon of relative dislocation deformation of a cross section of a material along the direction of action of a pair of closely spaced, equally-sized, oppositely directed transverse external forces (i.e., forces perpendicular to the action plane). The force that can cause a shear deformation of a material is called shear force or shear force. The section where shear deformation occurs is called a shear plane. The key to determining whether to "shear" is whether the cross-section of the material is relatively dislocated. A schematic diagram of the extrusion break principle is shown in fig. 5, wherein the cutting edge 501 extrudes material 502 onto a support plate 503, by controlling the advancement of the cutting edge 501 to break. The limitation of the extrusion mode fracture material is: the required extrusion force is (1) larger, (2) the angle of taper of the cutting edge is smaller to increase the pressure, resulting in large abrasion of the cutting edge and short service life, and (3) a support structure is required to be provided for the cut material, resulting in larger volume of the operating instrument. The invention adopts the shearing line breaking principle shown in fig. 6, wherein the dislocation F distance of the cutting edges 601 and 602 is distributed on two sides of the wire, and the line breaking is completed through shearing action, so that the invention has the advantage of stable and reliable line breaking for harder wires. In addition, the cutting edge shown in fig. 6 can be in other shapes, and a wedge-shaped structure is preferably adopted instead of a mode like extrusion fracture, so that the pressure intensity of the cutting edge is reduced, and the service life is prolonged. Furthermore, the shearing principle of the invention can protect the knife edge and improve the shearing effect on the ductile material.
Optionally, when the upper blade opening and the lower blade opening are closed, a distance between the upper blade opening and an end surface of the lower blade where the wire passing hole is located is smaller than or equal to a diameter of the medical element. In practice, the length of the broken wire is an important indicator for evaluating the performance of the shearing device. As shown in fig. 4, in one embodiment of the present invention, the distance between the cutting edge of the upper blade and the end surface of the via hole on the lower blade, that is, the distance E shown in fig. 4, is reasonably controlled, so as to shorten the length of the spare wire. In use, dimension E may be designed as desired, and a preferred embodiment of the present invention chooses to have the distance be less than or equal to the diameter of the medical element. Of course other dimensions may be used. According to the shearing principle described above, the scheme of the invention can realize stable and reliable shearing operation, and through design verification, the length of the residual wire can be 0.5mm.
Alternatively, as shown in fig. 1 and 3, the flexible connection mechanism includes a flexible synchronization tube 301 and a flexible sheath tube 302; the flexible synchronous tube is arranged in the flexible sheath tube and moves in the flexible sheath tube under the control of the operating mechanism. Preferably, the flexible synchronous tube has good tensile property and can synchronously transmit the actions of the operating mechanism in a ratio of 1:1. One end of the flexible synchronous tube is connected with the executing mechanism, and the other end of the flexible synchronous tube is connected with the operating mechanism, so that the operating mechanism synchronously controls the executing mechanism by pulling the flexible synchronous tube, and the executing state of the executing mechanism is switched between shearing and non-shearing. One end of the flexible sheath tube is connected with the actuating mechanism, and the other end of the flexible sheath tube is connected with the operating mechanism and provides support for the flexible synchronous tube. In practice, flexible sheaths must not only have good flexibility in order to be able to adapt to complex human tissue environments, such as the human vascular environment. Meanwhile, the flexible sheath tube also needs to have enough compression resistance, so that the phenomenon that the action of the operation mechanism cannot be synchronously transmitted due to excessive deformation of the flexible sheath tube caused by external force generated during movement of the flexible synchronous tube is avoided, and the shearing effect is influenced.
Alternatively, as shown in fig. 3 and 4, the flexible connection mechanism includes a flexible synchronization tube and a flexible sheath tube; the flexible synchronous tube is arranged in the flexible sheath tube and can move in the flexible sheath tube; one end of the flexible synchronous tube is connected with the traction arm 406 of the upper knife, and the other end of the flexible synchronous tube is connected with the operating mechanism, so that the operating mechanism can move the flexible synchronous tube in the sheath tube by pulling the flexible synchronous tube, and further pulling the traction arm to rotate the upper knife, so that the actuating mechanism is switched between a shearing state and a non-shearing state. One end of the flexible sheath tube is connected with the end part of the base, which is far away from the lower knife, and the other end of the flexible sheath tube is connected with the operating mechanism and provides support for the flexible synchronous tube.
Alternatively, as shown in fig. 7, the operating mechanism includes a housing 701 that may be provided in a split arrangement to facilitate manufacturing and assembly. The left and right sides of the housing are provided with sliding grooves 702, and the sliding grooves can be arranged on the housing which is arranged in a left-right split manner. A front seat 703, a rear seat 704 and a handle mechanism are also arranged in the shell; the front seat is fixedly arranged in the shell, and one end of the front seat, which is close to the actuating mechanism, is connected with the flexible sheath (see figure 8); the rear seat is arranged in the shell, the flexible synchronous tube penetrates through the axial inner hole of the front seat and then is connected with one end of the rear seat, and the other end of the rear seat is connected with the handle mechanism; the rear seat can slide along sliding grooves formed in the left side and the right side of the shell, and the handle mechanism drives the rear seat to reciprocate along the sliding grooves to control the flexible synchronous tube to move back and forth, so that the actuating mechanism is pulled to be in a shearing or non-shearing state, such as controlling the upper knife and the lower knife to be in dislocation closing, or enabling the upper knife to be far away from the lower knife.
Alternatively, as shown in fig. 7 and 8, the handle mechanism includes a link 705, a wrench 706, and a tension spring 707. The wrench is rotatably coupled to the housing, and in one embodiment the rotational coupling point is located at the top of the housing. One side of the portion of the wrench 706 located in the housing is connected to a tension spring, optionally with a hook provided on the wrench, to which the tension spring is hooked. The other end of the tension spring is fixed in the shell, the tension spring is in a stretching state, and a restoring force is always provided for the spanner and used for controlling the handle mechanism to reset. The other side of the part of the wrench in the shell is connected with one end of the connecting rod. The embodiment shown in fig. 7 employs a recess in the end of the connecting rod into which the wrench is rotatably mounted. The other end of the connecting rod is connected with the end part of the rear seat far away from the actuating mechanism. In the embodiment shown in fig. 7, a groove is also provided at the other end of the connecting rod, so that the rear seat is rotatably mounted in the groove.
Optionally, the length of the arm of force between the external force action point on the wrench and the rotational connection point of the wrench and the housing is L1, and the length of the arm of force between the connecting rod and the rotational connection point of the wrench and the housing is L2, where L1 is greater than L2. The working principle of the present invention is illustrated by simplifying the stress state as shown in fig. 8. Under a certain shearing state, the length of a force arm between an external force acting point on the wrench and a rotating connecting point of the wrench and the shell is A, the length of a force arm between the connecting rod and the rotating connecting point of the wrench and the shell is B, and A is larger than B, namely, the flexible synchronous tube is pulled by adopting the lever principle, so that the driving force is reduced, and the acting force on the flexible sheath tube is also reduced. The operation is convenient, and the deformation of the flexible sheath tube is reduced. In addition, the lever structure is matched with the lever structure described above, so that the driving external force can be further reduced, the deformation of the sheath tube is further reduced, the synchronization precision of the operation action of the operating mechanism is improved, and the shearing effect is improved.
According to a second aspect of embodiments of the present invention, there is provided a method of using a flexible shearing device, comprising: an actuator that intervenes in human tissue to shear the medical element; an operating mechanism for controlling the movement of the actuator to switch the actuator between a sheared state and a non-sheared state; the device also comprises a flexible connecting mechanism, wherein one end of the flexible connecting mechanism is connected with the executing mechanism, and the other end of the flexible connecting mechanism is connected with the operating mechanism;
during shearing operation, the control action of the operating mechanism is transmitted to the executing mechanism through the flexible connecting mechanism so as to control the executing state of the executing mechanism.
Optionally, in the using method, the executing mechanism includes a lower cutter, an upper cutter and a base; the lower cutter is fixedly connected to one end of the base, and a rotating shaft is arranged on the top surface of the lower cutter; the upper knife is pivoted with the lower knife through the rotating shaft, the flexible connecting mechanism is connected with one end of the upper knife, and the operating mechanism controls the upper knife to rotate along the rotating shaft through the flexible connecting mechanism so as to control the execution state of the executing mechanism.
Optionally, in the using method, the upper knife and the lower knife are respectively provided with a wire passing hole, and the medical element passes through the wire passing holes and is positioned between the upper knife cutting edge of the upper knife and the lower knife cutting edge of the lower knife; when the medical element is sheared, the length of a force arm from the contact point between the medical element and the upper blade opening to the rotating shaft is C1; the length of a force arm from a connecting point between the flexible connecting mechanism and one end of the upper cutter to the rotating shaft is C2; the C1 is smaller than the C2 so as to reduce the shearing operation force.
Optionally, in the using method, the lower knife is provided with an avoidance groove for accommodating the medical element and the upper knife edge in the shearing process; the upper blade opening and the lower blade opening are in dislocation closure, when the medical element is sheared, the medical element is broken through the dislocation closure of the upper blade opening and the lower blade opening, and the part of the medical element to be moved out of human tissue and the upper blade opening enter the avoidance groove.
Optionally, when the upper knife edge and the lower knife edge are closed in the using method, the distance between the upper knife edge and the end face of the wire passing hole on the lower knife is smaller than or equal to the diameter of the medical element.
Optionally, in the using method, the flexible connection mechanism includes a flexible synchronization tube and a flexible sheath tube; the flexible synchronous tube is arranged in the flexible sheath tube and can move in the flexible sheath tube; one end of the flexible synchronous tube is connected with the executing mechanism, and the other end of the flexible synchronous tube is connected with the operating mechanism, so that the operating mechanism synchronously controls the executing mechanism through the flexible synchronous tube, and further controls the executing state of the executing mechanism; one end of the flexible sheath tube is connected with the actuating mechanism, and the other end of the flexible sheath tube is connected with the operating mechanism and provides support for the flexible synchronous tube.
Optionally, in the using method, the flexible connection mechanism includes a flexible synchronization tube and a flexible sheath tube; the flexible synchronous tube is arranged in the flexible sheath tube and can move in the flexible sheath tube; one end of the flexible synchronous tube is connected with the traction arm of the upper cutter, and the other end of the flexible synchronous tube is connected with the operating mechanism, so that the operating mechanism can control the upper cutter to rotate by pulling the flexible synchronous tube, and further control the execution state of the executing mechanism; one end of the flexible sheath tube is connected with the end part of the base, which is far away from the lower knife, and the other end of the flexible sheath tube is connected with the operating mechanism and provides support for the flexible synchronous tube.
Optionally, in the using method, the operating mechanism includes a casing, and sliding grooves are arranged on the left side and the right side of the casing; the shell is also internally provided with a front seat, a rear seat and a handle mechanism; the front seat is fixedly arranged in the shell, and one end of the front seat, which is close to the executing mechanism, is connected with the flexible sheath; the rear seat is arranged in the shell, the flexible synchronous tube penetrates through the axial inner hole of the front seat and then is connected with one end of the rear seat, and the other end of the rear seat is connected with the handle mechanism; the rear seat can slide along sliding grooves arranged on the left side and the right side of the shell; when the flexible synchronous tube is used, the handle mechanism drives the rear seat to reciprocate along the sliding groove so as to control the flexible synchronous tube to move back and forth, and the working state of the executing mechanism is controlled.
Optionally, in the using method, the handle mechanism comprises a connecting rod, a wrench and a tension spring; the wrench is rotationally connected to the shell, one side of the part of the wrench, which is positioned in the shell, is connected with the tension spring, the other end of the tension spring is fixed in the shell, and the tension spring is used for controlling the handle mechanism to reset; the other side of the part of the wrench in the shell is connected with one end of a connecting rod, and the other end of the connecting rod is connected with the end part of the rear seat, which is far away from the actuating mechanism.
Optionally, in the using method, the length of a force arm between the external force acting point on the wrench and the rotation connecting point of the wrench and the shell is L1, and the length of a force arm between the connecting rod and the rotation connecting point of the wrench and the shell is L2, where L1 is greater than L2, so as to reduce the shearing operation force.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives can occur depending upon design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (10)
1. A flexible shearing device comprising:
an actuator that intervenes in human tissue to shear the medical element;
an operating mechanism for controlling the movement of the actuator to switch the actuator between a sheared state and a non-sheared state;
the method is characterized in that: the device also comprises a flexible connecting mechanism, wherein one end of the flexible connecting mechanism is connected with the executing mechanism, the other end of the flexible connecting mechanism is connected with the operating mechanism, and the control action of the operating mechanism is transmitted to the executing mechanism through the flexible connecting mechanism so as to control the executing state of the executing mechanism;
the executing mechanism comprises a lower cutter and an upper cutter;
the upper knife and the lower knife are respectively provided with a wire passing hole, and the medical element passes through the wire passing holes and is positioned between the upper knife cutting edge of the upper knife and the lower knife cutting edge opening of the lower knife.
2. A shearing device as in claim 1 wherein,
the executing mechanism further comprises a base;
the lower cutter is fixedly connected to one end of the base, and a rotating shaft is arranged on the top surface of the lower cutter;
the upper knife is pivoted with the lower knife through the rotating shaft, the flexible connecting mechanism is connected with one end of the upper knife, and the operating mechanism controls the upper knife to rotate along the rotating shaft through the flexible connecting mechanism so as to control the execution state of the executing mechanism.
3. A shearing device as in claim 2 wherein,
when the medical element is sheared, the length of a force arm from the contact point between the medical element and the upper blade opening to the rotating shaft is C1;
the length of a force arm from a connecting point between the flexible connecting mechanism and one end of the upper cutter to the rotating shaft is C2;
and C1 is smaller than C2.
4. A shearing device as in claim 3 wherein,
the lower knife is provided with an avoidance groove for accommodating the medical element and the upper knife cutting edge in the shearing process;
the upper blade opening and the lower blade opening are in dislocation closure, and when the medical element is sheared, the medical element is broken through dislocation closure of the upper blade opening and the lower blade opening.
5. A shearing device as in claim 3 wherein,
when the upper blade opening and the lower blade opening are closed, the distance between the upper blade opening and the end surface of the wire passing hole on the lower blade is smaller than or equal to the diameter of the medical element.
6. A shearing device as in claim 1 wherein,
the flexible connecting mechanism comprises a flexible synchronous tube and a flexible sheath tube;
the flexible synchronous tube is arranged in the flexible sheath tube and can move in the flexible sheath tube; one end of the flexible synchronous tube is connected with the executing mechanism, and the other end of the flexible synchronous tube is connected with the operating mechanism, so that the operating mechanism synchronously controls the executing mechanism through the flexible synchronous tube, and further controls the executing state of the executing mechanism;
one end of the flexible sheath tube is connected with the actuating mechanism, and the other end of the flexible sheath tube is connected with the operating mechanism and provides support for the flexible synchronous tube.
7. A shearing device as claimed in any one of claims 2 to 5,
the flexible connecting mechanism comprises a flexible synchronous tube and a flexible sheath tube;
the flexible synchronous tube is arranged in the flexible sheath tube and can move in the flexible sheath tube; one end of the flexible synchronous tube is connected with the traction arm of the upper cutter, and the other end of the flexible synchronous tube is connected with the operating mechanism, so that the operating mechanism can control the upper cutter to rotate by pulling the flexible synchronous tube, and further control the execution state of the executing mechanism;
one end of the flexible sheath tube is connected with the end part of the base, which is far away from the lower knife, and the other end of the flexible sheath tube is connected with the operating mechanism and provides support for the flexible synchronous tube.
8. A shearing device as in claim 7 wherein,
the operating mechanism comprises a shell, and sliding grooves are formed in the left side and the right side of the shell; the shell is also internally provided with a front seat, a rear seat and a handle mechanism;
the front seat is fixedly arranged in the shell, and one end of the front seat, which is close to the executing mechanism, is connected with the flexible sheath;
the rear seat is arranged in the shell, the flexible synchronous tube penetrates through the axial inner hole of the front seat and then is connected with one end of the rear seat, and the other end of the rear seat is connected with the handle mechanism; the rear seat can slide along sliding grooves formed in the left side and the right side of the shell, and the handle mechanism drives the rear seat to reciprocate along the sliding grooves so as to control the flexible synchronous tube to move back and forth.
9. A shearing device as in claim 8 wherein,
the handle mechanism comprises a connecting rod, a spanner and a tension spring;
the wrench is rotationally connected to the shell, one side of the part of the wrench, which is positioned in the shell, is connected with the tension spring, the other end of the tension spring is fixed in the shell, and the tension spring is used for controlling the handle mechanism to reset; the other side of the part of the wrench in the shell is connected with one end of a connecting rod, and the other end of the connecting rod is connected with the end part of the rear seat, which is far away from the actuating mechanism.
10. A shearing device as in claim 9 wherein,
the length of the arm of force between the external force action point on the wrench and the rotation connection point of the wrench and the shell is L1,
the length of the arm of force between the connecting rod and the rotational connection point of the wrench and the shell is L2,
l1 is greater than L2.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111189760.8A CN113951989B (en) | 2021-10-13 | 2021-10-13 | Flexible shearing device and application method thereof |
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| CN202111189760.8A CN113951989B (en) | 2021-10-13 | 2021-10-13 | Flexible shearing device and application method thereof |
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| CN113951989B true CN113951989B (en) | 2023-06-20 |
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| CN116421243B (en) * | 2023-06-15 | 2023-09-12 | 杭州锐健马斯汀医疗器材有限公司 | medical cutter |
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| CN207996960U (en) * | 2018-03-13 | 2018-10-23 | 赛宝（江西）实业有限公司 | A kind of data wire-electrode cutting device |
| CN109706648A (en) * | 2019-03-06 | 2019-05-03 | 拓卡奔马机电科技有限公司 | A kind of automatic thread trimming device on sewing machine |
| CN110238326A (en) * | 2019-06-28 | 2019-09-17 | 惠州市兴声科技有限公司 | Wire cutting mechanism |
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|---|---|---|---|---|
| US6673087B1 (en) * | 2000-12-15 | 2004-01-06 | Origin Medsystems | Elongated surgical scissors |
| US7789825B2 (en) * | 2003-09-29 | 2010-09-07 | Ethicon Endo-Surgery, Inc. | Handle for endoscopic device |
| US8137381B2 (en) * | 2007-04-25 | 2012-03-20 | Arthrocare Corporation | Knotless suture anchor having discrete polymer components and related methods |
| DE102017002976B4 (en) * | 2017-03-28 | 2021-08-26 | Immanuel Albertinen Diakonie Ggmbh | Minimally invasive implantable device for eliminating mitral valve insufficiency in the beating heart and mitral valve implant system |
| CN109127957B (en) * | 2018-08-16 | 2021-03-05 | 上海沃恒机械设备有限公司 | Split type cutter and split type cutting tool |
| CN211325273U (en) * | 2019-11-22 | 2020-08-25 | 茵络(无锡)医疗器械有限公司 | Thread trimming device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN207996960U (en) * | 2018-03-13 | 2018-10-23 | 赛宝（江西）实业有限公司 | A kind of data wire-electrode cutting device |
| CN109706648A (en) * | 2019-03-06 | 2019-05-03 | 拓卡奔马机电科技有限公司 | A kind of automatic thread trimming device on sewing machine |
| CN110238326A (en) * | 2019-06-28 | 2019-09-17 | 惠州市兴声科技有限公司 | Wire cutting mechanism |
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Address after: 201207 Shanghai Pudong New Area free trade trial area, 1 spring 3, 400 Fang Chun road. Applicant after: Shanghai Huihe Medical Instrument Co.,Ltd. Applicant after: Shanghai Huihe Medical Technology Co.,Ltd. Address before: 201207 Shanghai Pudong New Area free trade trial area, 1 spring 3, 400 Fang Chun road. Applicant before: Shanghai Huihe Medical Instrument Co.,Ltd. Applicant before: Shanghai Huihe Medical Technology Co.,Ltd. |
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