CN213588454U - Intramedullary nail sighting device and bone treatment system - Google Patents

Abstract

The utility model provides an intramedullary nail sight and skeleton treatment system, the intramedullary nail sight is applicable to multiple intramedullary nail, and it includes: a handle, wherein the inner end of the handle is adapted to engage any intramedullary nail selected from the plurality of intramedullary nails; a connecting device including a fixed portion and a rotating portion rotatably coupled to the fixed portion, wherein the fixed portion is fixed to an outer end portion of a handle such that a rotation axis of the rotating portion is fixed with respect to the handle and directed to an anterior bow bending start position of the intramedullary nail in a state in which the intramedullary nail is coupled to the inner end portion; and an aiming arm having a distal aiming hole and being clamped to the rotating portion at a position corresponding to the intramedullary nail so that the distal aiming hole is aligned with a distal screw hole of the intramedullary nail in a state where the intramedullary nail is coupled to the inner end portion.

Description

Intramedullary nail sighting device and bone treatment system

Technical Field

The present invention relates to a medical instrument for orthopedic surgery, and more particularly, to an intramedullary nail sighting device suitable for implanting a plurality of intramedullary nails into a medullary cavity of a patient and aiming screw holes of the intramedullary nails, and a bone treatment system including the same.

Background

Intramedullary nail fixation is one of the surgical techniques for treating large long bone fractures. The technology has the advantages of relatively minimal invasion, less bleeding, less complication, capability of early activity and the like. However, due to the irregular shape of the marrow cavity, the intramedullary nail with a single shape is forced to be deformed by compression after being implanted into the marrow cavity, especially to be inclined at the initial position of the anterior bow bend, thereby causing the position of the distal screw hole to change, and the position of the distal screw hole cannot be positioned, thereby causing the implantation of the distal locking screw to be very difficult, resulting in prolonged operation time, increased ray use and even risk of operation failure.

The closest intramedullary nail aimer system technology available is the intraoperative adjustment technique.

The intraoperative adjustment technology is that in the operation process, X-ray imaging is used for assisting, the position of the guide sleeve is finely adjusted continuously, and the guide sleeve is aligned with a nail hole in an implant. The adjusting mechanism is divided into two types, one is a sliding mechanism, and the other is a rotating mechanism. The difference between the motion mode of the existing sliding mechanism and the deformation actually generated by the implant is larger, and larger axial deviation is easily generated after the intramedullary nail is implanted. The position of the rotation center of the existing rotation mechanism may vary due to the length variation of the implant, so that the position of the aiming hole cannot be the same as the position of the distal screw hole of the intramedullary nail which is inclined after implantation even through rotation, that is, a large axial deviation is also generated. In addition, to complete the intramedullary nail implantation procedure, both the proximal and distal screws of the intramedullary nail need to be implanted. To accomplish this, the prior art requires first attaching the intramedullary nail to the handle, then attaching the proximal sight, removing the proximal sight after the proximal screw implantation is complete, and reassembling the various components of the distal sight. The series of complicated processes undoubtedly increase the difficulty of the operation, increase the risk of errors in the operation, prolong the operation time and have more strict requirements on doctors.

Therefore, there is a need in the art for an intramedullary nail aiming system that can easily and conveniently complete an intramedullary nail implantation procedure and accurately aim the nail holes.

SUMMERY OF THE UTILITY MODEL

In order to solve the above-mentioned problems in the prior art, the present invention provides an intramedullary nail aiming device, which is suitable for various intramedullary nails and comprises:

a handle having an outer end and an inner end, wherein the inner end is adapted to engage any intramedullary nail selected from the plurality of intramedullary nails;

a connecting device including a fixing portion and a rotating portion rotatably coupled to the fixing portion, wherein the fixing portion is fixed to the outer end portion so as to position a rotation axis of the rotating portion to be directed to a front bow bending start position of the intramedullary nail in a state in which the intramedullary nail is coupled to the inner end portion; and

an aiming arm, wherein the aiming arm is clamped to the rotating portion at a position corresponding to the intramedullary nail such that a plurality of distal aiming holes of the aiming arm align with a plurality of distal screw holes of the intramedullary nail in a state in which the intramedullary nail is coupled to the inner end portion.

Optionally, the outer end of the handle is provided with a proximal aiming hole for aiming at a proximal screw hole of the intramedullary nail.

Optionally, the outer end of the handle is further provided with a guide pin hole for introducing a guide pin.

Optionally, the aiming arm further comprises a plurality of locating features corresponding to the plurality of intramedullary nails, the aiming arm being clamped to the rotating portion at the locating features corresponding to the intramedullary nails.

Optionally, the rotating portion further comprises an interface for engaging the positioning structure.

Optionally, the fixing portion further comprises a locating pin with an opening at an end, the locating pin being inserted into a receiving hole in the outer end to fix the fixing portion to the outer end.

Optionally, the rotating portion is further provided with scale marks for indicating a rotation angle thereof, and the fixed portion is provided with a window for exposing the scale marks so as to be visible from the outside.

Optionally, the attachment device further comprises a locking device rotatably coupled to the stationary portion, the locking device configured to be rotated to switch between a locked position and an unlocked position, in the locked position the locking device pressing against the aiming arm to lock the aiming arm and the rotating portion together relative to the stationary portion; in the unlocked position, the locking device is out of contact with the aiming arm, thereby enabling the aiming arm and the rotating portion to rotate relative to the fixed portion.

Optionally, the rotating portion further comprises a knob resiliently biased against the aiming arm.

Also, in order to solve the above problems in the prior art, the present invention further provides a bone treatment system, which includes the intramedullary nail aiming device and the intramedullary nail suitable for the intramedullary nail aiming device.

The invention may be embodied as exemplary embodiments in the drawings. It is to be noted, however, that the drawings are designed solely for purposes of illustration and that any changes which come within the teachings of the invention are intended to be embraced therein and are limited only by the scope of the invention as defined in the appended claims.

Drawings

The drawings illustrate exemplary embodiments of the invention. These drawings should not be construed as necessarily limiting the scope of the invention. Like numbers and/or like reference numerals may refer to like and/or like elements throughout. In the various drawings:

fig. 1 is a schematic perspective view of an intramedullary nail sight and bone treatment system according to the present invention in an assembled state;

fig. 2 is a schematic perspective view of an intramedullary nail sight and bone treatment system according to the present invention in a disassembled state;

fig. 3 is a schematic perspective view of the connecting device of the intramedullary nail sight according to the present invention in an assembled state;

fig. 4 is a schematic perspective view of the connecting device of the intramedullary nail sight according to the present invention in a disassembled state;

fig. 5 is a schematic perspective view of the connecting device of the intramedullary nail sight according to the present invention in an assembled state; and

fig. 6 is a schematic illustration of the intramedullary nail tilted after implantation and the operation of the prior art aiming mechanism.

Detailed Description

The invention will now be described in more detail with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as necessarily limited to the exemplary embodiments set forth herein. Rather, these exemplary embodiments are provided only to illustrate the present invention and to convey the concept of the invention to those skilled in the art.

As used herein, the terms "proximal P" and "distal D" are defined relative to the torso of a patient at the time of implantation surgery, with reference to the human body and the components described herein that are intended for implantation in the human body, wherein the term "proximal P" is the end closer to the cardiac site and the term "distal D" is the end farther from the cardiac site, on the basis of which the term "proximal P" and the term "distal D" together define a proximal-distal direction DP; the term "medial end M" and the term "lateral end L" are defined relative to the sagittal plane of the patient, wherein the term "medial end M" refers to the side closer to the sagittal plane and the term "lateral end L" refers to the side farther from the sagittal plane, on the basis of which the term "medial end M" and the term "lateral end L" together define a medial-lateral direction ML; the term "anterior end F" and the term "posterior end B" are defined relative to the orientation of the patient, wherein the term "anterior end F" refers to the direction in which the patient is facing and the term "posterior end B" refers to the direction in which the patient is facing away, and, based thereon, the term "anterior end F" and the term "posterior end B" together define an anterior-posterior direction FB. In the above definition, a "sagittal plane" is an imaginary vertical plane passing through the middle of the body or body structure, which divides the body or body structure into left and right halves. It is to be noted, however, that the above definition of relative orientation is given only for the purpose of better illustrating the technical solution of the present invention through the accompanying drawings, which should not be construed as limiting the scope of protection of the present invention in any way.

Referring to fig. 1-4, in accordance with one aspect of the present invention, an intramedullary nail aimer is provided that generally includes a connecting device 100 and an aiming arm 200 and a handle 300 connected by the connecting device 100. The respective constituent elements are described in detail next.

The handle 300 of the present intramedullary nail sight is described below with reference to fig. 1. As shown in fig. 1, the handle 300 is generally U-shaped, with the opening of the U-shaped structure facing in the distal direction D in the situation shown in the figure. Handle 300 includes an outer end 310 and an inner end 320 separated along a medial-lateral direction ML, where outer end 310 is for engaging connection device 100, inner end 320 is for engaging intramedullary nail 400 to be implanted, and grip 330 connects outer end 310 with inner end 320, where grip 330 is for engaging a hand of an operator (e.g., a surgeon).

Optionally, the outer end portion 310 of the handle 300 is provided with one or more proximal aiming holes 340 in the form of through holes, which proximal aiming holes 340 are aligned with the proximal screw holes 440 in the intramedullary nail 400 when the intramedullary nail 400 to be implanted is secured (e.g., by threaded connection, snap fit, friction fit, etc.) to the inner end portion 320, by "aligned" is meant that the proximal aiming holes 340 are coaxial with the proximal screw holes 440, as indicated by reference axis X1-X1' in fig. 1, whereby, after the intramedullary nail 400 is implanted in a patient (e.g., in a fractured femur of a patient), the guide sleeve may be inserted into the proximal aiming holes 340 and extended toward the proximal screw holes 440, with the guide sleeve, the proximal aiming holes 340, and the proximal screw holes 440 being coaxial, whereby the proximal screw holes 440 may travel in the guide sleeve toward the proximal screw holes 440 and eventually be screwed to bone through the proximal screw holes 440 (e.g., femur) to secure the intramedullary nail 400 within the patient at its proximal end. Thus, the guide sleeve and proximal bone screw may be guided directly using the proximal aiming hole 340 on the handle 300 during proximal fixation of the intramedullary nail. However, in the prior art, the proximal aiming device needs to be fixed to the handle, and then the guiding sleeve and the proximal bone screw are guided by the aiming hole on the proximal aiming device so as to perform the proximal fixation of the intramedullary nail, and after the proximal fixation of the intramedullary nail is completed, the proximal aiming device needs to be detached, and then the distal aiming device needs to be fixed to the handle, and then the guiding sleeve and the distal bone screw are guided by the aiming hole of the distal aiming device so as to perform the distal fixation of the intramedullary nail. Therefore, aiming device among the prior art uses loaded down with trivial details and takes time, compares with it, the utility model discloses an intramedullary nail sight uses simple and conveniently, need not relapse the dismouting, and this has greatly saved operation time, has alleviateed surgeon's burden and patient's misery.

In particular, as shown in fig. 1 and 2, a guide pin hole 350 is further formed on the outer end 310 of the handle 300. Thereby, the guide pin can be introduced into the guide pin hole 350 to provide a reference for the X-ray apparatus when the X-ray apparatus is used in the surgery, thereby ensuring that the surgery can be performed more smoothly.

Next, the aiming arm 200 of the present intramedullary nail aimer will be described with reference to fig. 1 and 2. As shown in fig. 1 and 2, the aiming arm 200 has a generally cylindrical shape extending in the proximal-distal direction DP. Aiming arm 200 has distal aiming holes 210 (four shown) in the form of through holes at its distal end, wherein distal aiming holes 210 are used to align with distal screw holes 410 in intramedullary nail 400. Further, after the physician selects an intramedullary nail 400 to be implanted for the patient according to the pre-and/or intra-operative planning, aiming arm 200 is clamped into connecting device 100 at a location corresponding to the selected intramedullary nail 400 such that each distal aiming hole 210 can be aligned with a respective distal screw hole 410, as shown by reference axes X2-X2 ', X3-X3', X4-X4 'and X5-X5' in fig. 1, after intramedullary nail 400 is secured to inner end 320 of handle 300.

In particular, as shown in fig. 1 and 2, the aiming arm 200 is provided with a plurality of locating structures (e.g., grooves or bosses) 225 distributed along its length (the proximal-distal direction DP shown in the figures), wherein each locating structure 225 corresponds to an intramedullary nail 400 and is configured to mate with the interface 125 of the rotating portion 120 of the connection device 100, as further described below, to locate the aiming arm 200 relative to the intramedullary nail 400. Thus, when a physician selects an intramedullary nail 400 to be implanted for a patient according to a pre-operative and/or intra-operative plan, aiming arm 200 is clamped into connecting device 100 at locating feature 225 corresponding to the selected intramedullary nail 400 to enable each distal aiming hole 210 to be aligned with a corresponding distal screw hole 410 after intramedullary nail 400 is secured to inner end 320 of handle 300. In addition, the plurality of locating structures 225 are provided to enable the instant intramedullary nail sight to fit a variety of intramedullary nails, that is, the plurality of locating structures 225 correspond to a variety of different sizes of intramedullary nails (specifically, different sizes along the proximal-distal direction DP), as described above, with each locating structure 225 corresponding to one size of intramedullary nail. It is noted that while 9 locating structures 225 are shown, in other embodiments, the number of locating structures 225 may vary depending on the type of intramedullary nail chosen, for example, if there are N intramedullary nails chosen, then N locating structures 225 may be provided. Accordingly, embodiments in which any number of positioning structures 225 are provided should be considered to be within the teachings of the present invention, and are therefore included within the scope of the present invention.

Optionally, the surface of aiming arm 200 is provided with the number of intramedullary nails corresponding to each locating structure 225, such as the numbers "30, 32, 34, 36, 38, 40, 42, 44, 46" shown on the upper surface of aiming arm 200. Therefore, after the physician selects the intramedullary nail to be implanted, the positioning structure 225 corresponding to the intramedullary nail can be found more conveniently according to the number of the intramedullary nail, so as to perform the subsequent operation more quickly, thereby improving the efficiency of the operation.

Optionally, the aiming arm 200 is symmetrical about an imaginary plane IP (shown in fig. 2) extending along its length (the proximal-distal direction DP shown in the figure). Thus, aiming arm 200 may be used in both left and right limb intramedullary nail implantation procedures. In particular, symbols "L" and "R" representing whether it is applied to the left or right limb implant surgery are provided on the outer surfaces of the aiming arm 200 on both sides of the imaginary plane IP, and may be set such that the symbol "L" faces the operator when the aiming arm 200 is used for the left limb implant surgery; when aiming arm 200 is used for right limb implant surgery, the symbol "R" faces the operator. For example, in the case of the right limb implanting procedure shown in fig. 1 and 2, the symbol "R" provided on the outer surface of the aiming arm 200 faces the operator in the outer end direction. Due to the arrangement of the symbols, the operator can be helped to quickly and accurately determine the arrangement direction of the aiming arm, and therefore the implantation operation can be ensured to be smoothly carried out.

In particular, as shown in fig. 1 and 2, aiming arm 200 is also provided with guide pin hole 220. Thus, the guide pin can be introduced into the guide pin hole 220 to provide a reference for the X-ray device when the X-ray device is used in the operation, thereby ensuring that the operation can be performed more smoothly.

Next, the connecting device 100 is described with reference to fig. 1 to 4. As shown, the connection device 100 includes a fixation portion 110, as shown in fig. 1-2, the fixation portion 110 configured to be secured to an outer end 310 of the handle 300. For example, the fixing part 110 may be fixed to the outer end part 310 of the handle 300 by a detachable connection means such as a screw connection, a snap connection, or the like. In particular, the fixing part 110 has fixing pins 111 provided on the outer surface thereof with openings at least at two ends thereof, wherein the end of each fixing pin 111 is divided into a plurality of petals by the opening thereof, and when the fixing pin 111 is inserted into the corresponding receiving hole 311 in the outer end portion 310, the plurality of petals at the end of the fixing pin 111 approach each other by being pressed by the hole wall of the receiving hole 311, but tend to separate from each other due to the effect of elastic restoring force, and thus the elastic restoring force presses the plurality of petals against the hole wall, so that the fixing pins 111 are securely held in the corresponding receiving holes 311. Thus, the fixing part 110 can be fixed to the outer end 310 and detached from the outer end 310 in a simple insertion and extraction manner, which greatly simplifies the assembly process of the intramedullary nail sight.

Optionally, when the physician selects a short gauge intramedullary nail as the intramedullary nail to be implanted, the receiving hole 311 may also be configured to point toward the distal screw hole of such a short gauge intramedullary nail when it is coupled to the inner end 320 of the handle 300. In this manner, the distal screw hole 410 of the intramedullary nail 400 may be targeted using the receiving bore 311 on the handle 300 when the intramedullary nail 400 is short such that the aiming arm 200 is not required to target its distal screw hole 410. In this manner, the intramedullary nail aimer may be adapted to a wide variety of intramedullary nails 400.

Further, the connection device 100 further comprises a rotating part 120, the rotating part 120 being rotatably fixed to the stationary part 110 such that the rotation axis XX 'of the rotating part 120 is fixed with respect to the stationary part 110, and the rotating part 120 being configured to grip the aiming arm 200 so as to bring the aiming arm 200 to rotate around the rotation axis XX'. In particular, the rotating portion 120 includes a body portion 121, wherein a pair of opposing body portion sidewalls 121a, 121b of the body portion 121 define an open recess 123 therebetween, the aiming arm 200 being configured to be clamped by the body portion sidewalls 121a, 121b in the recess 123. In particular, the rotary part 120 further includes a temporary fixing device 124 provided in one or both of the body part sidewalls 121a, 121b, the temporary fixing device 124 including a top bead 124a elastically biased to protrude from the body part sidewalls 121a, 121b into the groove 123. When the aiming arm 200 is inserted into the recess 123, the knob 124a will be pushed back by the aiming arm 200 so that the knob 124a will be resiliently biased against the aiming arm 200, whereby a temporary fixation of the aiming arm 200 may be achieved to facilitate adjustment by the surgeon during the procedure. In particular, the rotating portion 120 further comprises an interface (e.g. a boss provided in the recess 123, or an opening provided in the body portion side walls 121a, 121b and/or the body portion bottom wall 121 c) 125, said interface 125 being configured to mate/engage with one of the positioning structures 225 of the aiming arm 200 corresponding to the intramedullary nail 400 to be implanted, thereby ensuring that the aiming arm 200 is properly positioned with respect to the rotating portion 120, by "properly positioned" it is meant that the distal aiming hole 210 of the aiming arm 200 can be aligned with the distal screw hole 410 of the intramedullary nail 400 after the intramedullary nail 400 to be implanted is fixed to the inner end 320. Optionally, the rotating part 120 further includes a coupling part 122 extending from a body part bottom wall 121c of the body part 121 connecting the pair of body part sidewalls 121a, 121b toward a direction opposite to the groove 123, the coupling part 122 being configured to couple with the driving part 130 of the connecting device 100, so that the driving part 130 can drive the rotating part 120 to rotate around a rotation axis XX', as further described below.

Alternatively, as shown in fig. 4, the rotating part 120 is rotatably fixed to the fixing part 110 by a pair of fastening screws 140. More specifically, the fastening screw 140 includes a nut 141 and a cylindrical shank 142 protruding from the nut 141, wherein a middle portion 142a of the cylindrical shank 142 is threaded so as to engage with the corresponding threaded hole 112 in the fixing portion 110, and an end portion 142b of the cylindrical shank 142 is smooth so as to be inserted into the corresponding receiving hole 126 in the side wall 121a, 121b of the main body portion, thereby serving as a pivot shaft of the rotating portion 120. As shown in fig. 3 and 4, the fastening screw 140 is screwed into the fixing portion 110 from the outside of the fixing portion 110, and when the knob is in place, the threaded portion 142a of the cylindrical shank 142 is engaged with the threaded hole 112 of the fixing portion 110, and the smooth portion 142b thereof is inserted into the body portion side walls 121a, 121b of the rotating portion 120.

Optionally, the connection device 100 further comprises a driving portion 130, the driving portion 130 being likewise rotatably fixed to the stationary portion 110 and coupled with the rotating portion 120, such that rotation of the driving portion 130 can be converted into rotation of the rotating portion 120. Optionally, the driving part 130 includes a hand wheel 131 configured to engage with the hand of the operator, a rotating wheel 132 protruding from the hand wheel 131 and rotatably fixed to the fixing part 110, and a detour structure (e.g., detour groove or detour protrusion) 133 disposed in an end portion of the rotating wheel 132, and the coupling part 122 includes a coupling rod 122a combined to the bottom wall 121c of the body part and a coupling structure (e.g., coupling protrusion or coupling groove) 122b protruding from the coupling rod 122a, wherein the detour structure 133 is coupled/engaged with the coupling structure 122b of the coupling part 122, so that, when the operator rotates the hand wheel 131 to cause the rotating wheel 132 to rotate, the coupling structure 122b will travel along the detour structure 133, at which time, the detour configuration of the detour structure 133 will cause the distance between the coupling structure 122b and the center of the rotating wheel 132 to vary and further be fixed due to the rotation axis XX' of the coupling structure 122b, a change in the distance between the coupling structure 122b and the centre of the wheel 132 will thus be translated into a rotation of the coupling structure 122b, i.e. the rotary part 120, about the axis of rotation XX'. Therefore, according to the above configuration, the rotation portion 120 can be caused to rotate by rotating the hand wheel 131, which will also cause the aiming arm 200 to rotate in a state where the aiming arm 200 is clamped into the rotation portion 120. In addition, due to the above-described configuration of the bypass structure 133 and the coupling structure 122b received therein, the rotation of the rotating portion 120 and the aiming arm 200 is continuously and stably varied, and the rotating part 120 and the aiming arm 200 can be rotated only by rotating the driving part 130, and the driver 130 cannot be rotated by rotating the rotation part 120 and the aiming arm 200, that is, after the operator rotates the aiming arm 200 to a desired position (e.g., a position where the distal aiming hole 210 is aligned with the distal screw hole 410) by rotating the driver 130, as long as the drive portion 130 is no longer rotated, the aiming arm 200 will be locked in the current position, without deviating from the current position due to the operator's accidental contact with the aiming arm 200 or the weight of the aiming arm 200 itself, i.e., the above-described configuration achieves self-locking of the aiming arm 200, this greatly reduces the burden on the surgeon, so that the intramedullary nail implantation operation can be performed more conveniently and smoothly.

Optionally, as shown in fig. 3 and 4, the connecting device 100 further includes a limiting device 150 fixed to the fixing portion 110, wherein the limiting device 150 includes a limiting top bead 151 elastically biased out of the interior thereof, and the limiting top bead 151 is configured to be received by one of a plurality of limiting grooves 131a evenly distributed in the circumferential direction on the end surface of the runner 131, in other words, configured to be snapped into the one of the plurality of limiting grooves 131 a. Thus, the operator needs to overcome the elastic force biasing the position restricting top bead 151 into the position restricting groove 131a when rotating the rotating wheel 131, which can prevent the operator from mistakenly touching the rotating wheel 131 to deviate the aiming arm 200 from the desired position, thereby improving the stability of the present intramedullary nail aiming device.

Optionally, the connection device 100 further comprises a locking device 160, wherein the locking device 160 comprises a cam portion 161 rotatably fixed to the fixed portion 110 and a handle portion 162 extending from the cam portion 161, the cam portion 161 being switchable between two positions (i.e. a locking position and a release position) by rotating the handle portion 162, for example, the cam portion 161 pressing the aiming arm 200 to lock the aiming arm 200 and the rotating portion 120 together relative to the fixed portion 100; in the unlocked position, the cam portion 161 is out of contact with the aiming arm 200, thereby allowing the aiming arm 200 and the rotating portion 120 to rotate relative to the fixed portion 100. In this manner, the aiming arm 200 may be conveniently locked and unlocked with respect to the fixing portion 100 by rotating the locking device 160, for example, after the aiming arm 200 is rotated to a desired position (e.g., a position where the distal aiming hole 210 is aligned with the distal screw hole 410), the aiming arm 200 may be locked at the desired position by rotating the locking device 160, thereby more thoroughly preventing the aiming arm 200 from deviating from the current position due to factors such as an operator's mis-collision with the aiming arm 200 or the weight of the aiming arm 200 itself, which greatly reduces the burden on the surgeon, thereby enabling the intramedullary nail implantation procedure to be performed more conveniently and smoothly.

Optionally, as shown in fig. 5, the rotary part 120 is further provided with scale marks 127 arranged around the rotation axis XX' thereof for indicating the rotation angle thereof, more specifically, the scale marks 127 are arranged on one or both of a pair of opposed body part sidewalls 121a, 121b of the body part 121. In addition, the fixing portion 110 is provided with a window 113 for exposing the scale 127 so as to make the scale 127 visible from the outside, and particularly, a pointer 113a is provided on a side wall of the window 113. Thus, by the arrangement of the graduation marks 127, the window 113 and in particular the pointer 113a, the operator can easily know the rotation angle of the rotating part 120, i.e. the aiming arm 200, so that the rotation angle of the aiming arm 200 can be adjusted more accurately and specifically. In addition, as also shown in fig. 5, the driving part 130 is also provided with scale marks 131b indicating the rotation angle thereof, and more specifically, the scale marks 131b are provided on the outer surface of the jog dial 131 facing the operator.

Further, as shown in fig. 1, after the intramedullary nail 400 to be implanted is mounted to the inner end portion 320 of the handle 300, the rotation axis XX' of the rotating portion 120 is directed toward or passes through the anterior bow bending start position S of the intramedullary nail 400. As is well known, the natural inclination of the marrow cavity is generally present, and therefore the intramedullary nail 400 is also inclined after implantation in the marrow cavity, and the so-called anterior arch bend starting position S is, as the name implies, the starting position in which the intramedullary nail 400 is inclined after implantation in the marrow cavity, in other words, the intramedullary nail 400 will be inclined around its anterior arch bend starting position S after implantation in the marrow cavity, and the intramedullary nail 400 can be inclined around the rotation axis XX 'after implantation in the marrow cavity, since the rotation axis XX' passes through the anterior arch bend starting position S. In order to define this anterior bow start position S on intramedullary nail 400, for example, a narrowing portion, such as a portion that locally reduces the diameter of the intramedullary nail, or the like, may be machined into intramedullary nail 400 in such a way that multiple intramedullary nails 400 have the same anterior bow start position S, i.e., the proximal ends of multiple intramedullary nails 400 are approximately the same distance from their anterior bow start positions S. Further, since aiming arm 200 is clamped to rotating portion 120 at a location (e.g., locating feature 225) corresponding to the intramedullary nail 400 to be implanted, distal aiming hole 210 of aiming arm 200 can be aligned with distal screw hole 410 of intramedullary nail 400 in a state in which intramedullary nail 400 is secured to inner end 320 but not implanted in the intramedullary canal. However, as described above, after implantation in the medullary cavity, the intramedullary nail 400 may be tilted about the axis of rotation XX ', at which time the aiming arm 200 may be rotated by the rotating portion 120 also about the axis of rotation XX', which allows the distal aiming hole 210 of the aiming arm 200 to be realigned with the distal screw hole 410 of the intramedullary nail 400 without creating an axial offset between the distal aiming hole 210 and the distal screw hole 410 as in the prior art as described below. Although the arrangement of the intramedullary nail sight has been described above in relation to a selected one of the plurality of intramedullary nails to which it is adapted, it will be appreciated that the arrangement described above is applicable in relation to any of the plurality of intramedullary nails selected. That is, for any one of the intramedullary nails selected from the plurality of intramedullary nails, after the intramedullary nail and the connection device 100 are mounted to the handle 300, the rotation axis XX' of the rotating portion 120 of the connection device 100 is fixed with respect to the handle 300 and directed toward (or passed through) the anterior bow bend start position of the intramedullary nail; and further, the distal aiming hole 210 can be aligned with the distal screw hole of the intramedullary nail after the aiming arm 200 is fixed to the rotating portion 120 at a position corresponding to the intramedullary nail.

With the above-described solution, after a physician selects an intramedullary nail 400 for a patient who has encountered a fracture, or the like, for example, by preoperative and/or intraoperative planning, the instant intramedullary nail aimer may be assembled from the intramedullary nail 400 and the intramedullary nail 400 mounted thereon. Alternatively, intramedullary nail 400 may be installed prior to the present intramedullary nail sight assembly. At this time, according to the above-described solution, the rotation axis of the aiming arm 200 (i.e., the rotation axis XX' of the rotating portion 120) points or passes through the anterior bow bending start position S of the intramedullary nail 400, and the distal aiming hole 210 of the aiming arm 200 is aligned with the distal screw hole 410 of the intramedullary nail 400. However, as can be seen from the foregoing, referring to the dashed portion in fig. 6, after the intramedullary nail 400 is implanted in a patient (e.g., in the medullary cavity of a femur), the intramedullary nail 400 may tilt at the anterior bow start position S due to the natural inclination of the medullary cavity, resulting in a change in the position of the plurality of distal screw holes 410. When the intramedullary nail 400 is implanted in the medullary cavity of a patient, the orientation of the patient may be adjusted such that the intramedullary nail 400 is tilted about the rotational axis XX' of the rotating portion 120 at the anterior bow flexion starting position S after implantation in the patient. In this case, since the distal aiming hole 210 of the aiming arm 200 is aligned with the plurality of distal screw holes 410 when the intramedullary nail 400 is not implanted, and the aiming arm 200 can be rotated by the rotation part 120 around the rotation axis XX 'pointing to or passing through the anterior bow bending start position S, the distal aiming hole 210 can be simultaneously aligned with the plurality of distal screw holes 410 after the aiming arm 200 is rotated by a proper angle (during the alignment, it may be necessary to observe the positions of the aiming hole and the screw holes by using rays), without the deviation between the axial position of the aiming hole and the axial position of the distal screw hole occurring after the rotation due to the fact that the rotation axis S' of the aiming arm is not aligned with the anterior bow bending start position S as in the prior art aiming device shown by the two-dot chain line, which may cause difficulty in implanting the bone screw, even failure in implanting, or the doctor forcibly implanting the bone screw, thereby creating scratches on the surface of the intramedullary nail and consequently affecting its useful life. Generally speaking, utilize the utility model discloses an intramedullary nail sight, after the intramedullary nail is implanted in the patient, still enable each distal end aiming hole on the aiming arm and aim at each distal end screw hole on the intramedullary nail completely to make the implantation of bone screw (especially distal end bone screw) can go on smoothly, and the protection intramedullary nail is not damaged by the bone screw, thereby prolongs its life, simultaneously because the operation can go on smoothly, consequently can shorten doctor and patient and expose the time under the ray.

According to another aspect of the present invention, there is provided a bone treatment system comprising an intramedullary nail sight as described above and one or more intramedullary nails to which the intramedullary nail sight is applicable, wherein a physician may select any one of the one or more intramedullary nails as an intramedullary nail 400 to be implanted according to pre-and/or intra-operative planning, the intramedullary nail 400 to be implanted being coupled to the inner end 320 of the handle 300, the fixing portion 110 of the connecting device 100 being fixed to the outer end 310 of the handle 300 such that the rotation axis XX' of the rotating portion 120 of the connecting device 100 is fixed with respect to the handle 300 and aligned with the anterior bow bending start position S of the intramedullary nail 400 to be implanted, the aiming arm 200 being fixed to the rotating portion 120 of the connecting device 100 at a position corresponding to the intramedullary nail 400 to be implanted, such that the distal aiming hole 210 of the aiming arm 200 is aligned with the distal screw hole 410 of the intramedullary nail 400 to be implanted.

Preferred but non-limiting embodiments of an intramedullary nail sight and a bone treatment system comprising the same according to the present invention are described in detail above with the aid of the accompanying drawings. Modifications and additions to the techniques and structures, without departing from the scope and spirit of the disclosure as set forth in the following claims, are deemed to be within the scope of the invention. Accordingly, such modifications and additions as may be contemplated under the teachings of the present invention are intended to be part of this disclosure. The scope of the present disclosure is defined by the following appended claims, and includes equivalents known at the time of filing this disclosure and equivalents not yet foreseen.

Claims (10)

1. An intramedullary nail sight suitable for use with a plurality of intramedullary nails, the intramedullary nail sight comprising:

a handle (300) having an outer end (310) and an inner end (320), wherein said inner end (320) is adapted to engage any intramedullary nail (400) selected from said plurality of intramedullary nails;

a connection device (100) including a fixed portion (110) and a rotating portion (120) rotatably coupled to the fixed portion (110), wherein the fixed portion (110) is fixed to the outer end portion (310) so as to position a rotation axis (XX') of the rotating portion (120) to be directed to a front bow bending start position (S) of the intramedullary nail (400) in a state in which the intramedullary nail (400) is coupled to the inner end portion (320); and

an aiming arm (200), wherein the aiming arm (200) is clamped to the rotating portion (120) at a position corresponding to the intramedullary nail (400) such that a plurality of distal aiming holes (210) of the aiming arm (200) align with a plurality of distal screw holes (410) of the intramedullary nail (400) in a state in which the intramedullary nail (400) is coupled to the inner end (320).

2. Intramedullary nail sight according to claim 1, characterized in that the outer end (310) of the handle (300) is provided with a proximal aiming hole (340) for aiming at a proximal screw hole (440) of the intramedullary nail (400).

3. Intramedullary nail sight according to claim 1 or 2, characterized in that the outer end (310) of the handle (300) is further provided with a guide pin hole for introducing a guide pin.

4. Intramedullary nail sight according to claim 1 or 2, characterized in that the aiming arm (200) further comprises a plurality of positioning structures (225) corresponding to the plurality of intramedullary nails, the aiming arm (200) being clamped to the rotating part (120) at the positioning structures (225) corresponding to the intramedullary nail (400).

5. Intramedullary nail sight according to claim 4, characterized in that the rotating part (120) further comprises an interface (125) for engaging the positioning structure (225).

6. Intramedullary nail sight according to claim 1 or 2, characterized in that the fixing part (110) further comprises a positioning pin (111) with an opening at the end, the positioning pin (111) being inserted into a receiving hole (311) in the external extremity (310) in order to fix the fixing part (110) to the external extremity (310).

7. Intramedullary nail sight according to claim 1 or 2, characterized in that the rotating part (120) is further provided with graduation marks (127) for indicating its rotation angle and the fixed part (110) is provided with a window (113) for exposing the graduation marks (127) in order to make it visible from the outside.

8. Intramedullary nail sight according to claim 1 or 2, characterized in that the connecting device (100) further comprises a locking device (160) rotatably coupled to the fixed part (110), the locking device (160) being configured to be switched by rotation between a locking position in which the locking device (160) presses the aiming arm (200) locking the aiming arm (200) and the rotating part (120) together relative to the fixed part (110) and an unlocking position; in the release position, the locking device (160) is out of contact with the aiming arm (200), thereby enabling the aiming arm (200) and the rotating part (120) to rotate relative to the fixed part (110).

9. Intramedullary nail sight according to claim 1 or 2, characterized in that the rotating part (120) further comprises a top bead (124a) which is resiliently biased against the aiming arm (200).

10. Bone treatment system, characterized in that it comprises an intramedullary nail sight according to any one of claims 1 to 9 and an intramedullary nail to which it is applied.

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