KR101725419B1 - Peristaltic device for medicine injection - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interlock device for injecting a liquid such as a drug into a body and is capable of preventing drug from flowing backward and injecting a drug at a constant speed. A driving unit having an actuator that reciprocates; A power transmission unit having a latch gear that rotates only in one direction in accordance with the expansion and contraction movement of the actuator, and a drive gear coaxially coupled to the rotation shaft of the latch gear and rotated together with the latch gear; And an interlocking portion having an interlocking cam that presses the drug tube in one direction while rotating by rotation of the driving gear.

Description

[0001] PERSTALTIC DEVICE FOR MEDICINE INJECTION [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interlocking device for injecting a liquid such as a drug into a body, and relates to an interlocking device capable of preventing backflow of a drug and injecting a drug at a constant speed.

A pumping device used in a grafting drug injector is a device that is implanted into a patient's body to supply a certain drug into the spinal cord or vein. Such a drug injector needs to inject the drug into the patient's body at a constant rate. For example, depending on the condition of the patient or the composition of the drug, it may be necessary to inject a very small amount at a rate of a few micro liters per minute, and the drug infusion rate needs to be controlled to a bolus unit dose of several milliliters per minute .

The method of pumping a drug can be variously used such as a microactuator, electrophoresis, electroosmosis, capillary flow method, etc. However, an interlocking device for precisely controlling a drug injection amount according to a prescription by a doctor is needed.

1 to 3 show an example of a conventional interlocking device.

1, the interlocking device includes a drive gear 12 that is condensed on a drive shaft that rotates on a drive motor 10, a driven gear 20 and a driven gear 20 that are engaged with and engaged with the drive gear 12 The camshaft 34 is decelerated at a speed proportional to the rotation speed of the drive gear 12 by the reduction gear 30 coupled to the camshaft 34 and the cam 32 is rotated by being condensed on the camshaft 34. In this embodiment, the cam 32 is made of a resilient material while eccentrically moving, and presses the drug tube 40 through which the drug passes, at a constant speed. In this example, three cams 32 (32a, 32b, 32c) and drug tubes 40 (40a, 40b, 40c) are provided.

2, the cam 32 is eccentrically rotated about the camshaft 34 and comprises a pressing portion 32, which is a major axis portion of the camshaft 34, and a non-pressing portion 32 ', which is a minor axis portion. That is, when the pressing portion 32, which is the longer half of the cam 32, moves toward the drug tube 40, the pressing portion 32 presses the drug tube 40 and the non-pressing portion 32 ' Passes through the drug tube 40 without being pressed.

The three cams 32a, 32b, and 32c are provided at intervals of 120 degrees. When the camshaft 34 rotates, the displacement of the drug tube 40 by the cam is shown in FIG. Since the cam 32 pressurizes the drug tube 40 in the rotating direction, the rotation speed of the cam is adjusted to set the dosage.

However, the above-described conventional interlocking device uses a rotating motor as a driving motor and transmits the power through the rotation shaft of the rotating motor, the gear shaft, and the cam shaft, so that the mechanism is complicated. Therefore, a simple and miniaturized interlocking mechanism is needed.

It is an object of the present invention to provide an interlocking device for injecting a small-sized drug by removing a driving shaft of a motor by rotating a gear shaft using an actuator.

According to an aspect of the present invention, there is provided a driving apparatus comprising: a driving motor; a driving unit having an actuator for reciprocatingly reciprocating by the driving motor; A power transmission unit having a latch gear that rotates only in one direction in accordance with the expansion and contraction movement of the actuator, and a drive gear coaxially coupled to the rotation shaft of the latch gear and rotated together with the latch gear; And an interlocking portion having an interlocking cam that presses the drug tube in one direction while rotating by rotation of the driving gear.

The actuator includes: a rod coupled to the driving motor and linearly reciprocating; And a click member coupled to an end of the rod and pushing the gear teeth of the latch gear one by one in accordance with a linear reciprocating motion of the rod.

Wherein the click member is a clamping member made up of a first click member and a second click member, one end of which is rotatably coupled to an end of the rod, wherein one end of each of the first and second click members is the same And a spring is provided on the rotation shaft so that the other ends of the first and second click members are biased in a direction in which the other ends of the first and second click members are brought close to each other.

The gear teeth of the latch gear may have a tooth shape inclined in one direction and the other end of the second click member may have a projection corresponding to a tooth shape of the latch gear.

And the driving motor is an osmotic pump capable of linearly reciprocating the actuator.

Preferably, the power transmitting unit and the interlocking unit further include a deceleration unit, and the deceleration unit includes a reduction gear meshing with the driving gear; And a rotation shaft connecting the reduction gear and the interlocking cam so as to rotate together.

Wherein the reduction gear is fixed to a reduction gear rotation shaft which rotates together, the rotation gear is provided with a rotation member and rotates together, and at least one interlocking cam is mounted on an end of the rotation member, The inserted interlocking cam can press the drug tube.

The interlocking cam may be rotatably coupled to an end of the rotating member.

As described above, the drug can be injected at an accurate speed by using the small linear motion actuator, and the rotation axis of the motor can be removed, thereby making it possible to miniaturize the device.

1 is a cross-sectional view showing an example of an interlocking device for drug injection according to the prior art,
Fig. 2 is a view showing the shape of a cam used in the interlocking device of Fig. 1,
Fig. 3 is a graph showing the degree to which the drug tube is pressurized by the interlocking device of Fig. 1,
FIG. 4 is a perspective view illustrating an interlocking device for drug injection according to the present invention, FIG.
FIG. 5 is a perspective view showing an actuator of the interlocking device for drug injection according to the present invention,
FIG. 6 is a perspective view showing a latch gear of the interlocking device for drug injection according to the present invention, FIG.
Fig. 7 is a cross-sectional view showing an interlocking portion that rotates together with the reduction gear and the reduction gear meshed with the latch gear of Fig. 6; and
FIG. 8 is a plan view showing a drug tube that is pressed against the interlocking portion of FIG. 7 to interlock drugs.

 Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the embodiments of the present invention can be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. The shape and the size of the elements in the drawings may be exaggerated for clarity and the same elements are denoted by the same reference numerals in the drawings.

And throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "electrically connected" with another part in between. Also, when a component is referred to as being "comprising" or "comprising", it is to be understood that this does not exclude other components, unless the context otherwise requires, do.

4, an embodiment of the interlocking device for drug injection according to the present invention includes a driving motor 111 and a driving unit 111 having an actuator 112 that performs an elastic reciprocating motion by a driving motor 111 110); A latch gear 122 which rotates by one click in the predetermined direction in accordance with one time stretching and contracting motion of the actuator 112 and a driving gear 120 coaxially connected to the latch gear 122 A power transmission portion having a power transmission portion; A reduction gear 130 meshing with the driving gear 120; And an interlocking cam 132 that is coaxially coupled to the reduction gear 130 and rotates together to press the drug tube (not shown) in one direction.

As shown in FIG. 5, the drive motor 111 may be a power source, such as a servo motor, an osmotic pump, or a solenoid pump, which can linearly reciprocate the actuator 112. In this embodiment, the driving motor 111 uses an osmotic pump in consideration of energy consumption and size. Since the detailed configuration of the osmotic pressure pump is well known in the art, a detailed description thereof will be omitted.

The actuator 112 includes a rod 113 and a click member 114, 115 coupled to the drive motor 111. The click members 114 and 115 are jaw-like members rotatably coupled to the ends of the rod 113 and are made up of a first click member 114 and a second click member 115. One end of each of the first and second click members 114, 115 is rotatably coupled coaxially. Thus, each of the other ends can be moved away from or close to each other by rotation, so that it acts like a forceps. A spring (not shown) is provided on the rotary shaft of the first and second click members 114 and 115 to bias the other end portions of the first and second click members 114 and 115 toward each other .

Operation of the power transmitting portion will be described with reference to Figs. 5 and 6. Fig.

The above-described first and second click members are disposed on the same plane as the latch gear 122. During one linear motion of the actuator 112, the first and second click members 114 and 115 push out one of the gear teeth of the latch gear. In FIG. 3, a straight arrow indicates a movement path of the click member, and a rotation direction of the drive gear is indicated by a curved arrow.

The gear teeth of the latch gear 122 have a tooth shape inclined in one direction. The other end of the second click member 115 is formed with a protrusion corresponding to the tooth shape of the latch gear 122, and can be inserted between the teeth of the latch gear 122. The other end of the first and second click members 114 and 115 moves to the side of the latch gear 122 and the projection of the second click member 115 moves to the side of the latch gear 122 by the movement of the actuator 112. [ The latch gear 122 is pushed out of engagement with the tooth profile. At this time, the first click member 114 is opened on the inclination of the latch gear 122, so that the rotation of the latch gear 122 is not disturbed. Conversely, when the other end of the first and second click members 114 and 115 is moved in the direction away from the latch gear 122 by the motion of the actuator 112, the projection of the second click member 115 is engaged with the latch gear 122). ≪ / RTI > At this time, a reverse rotational force is generated by the frictional force between the second click member 115 and the toothed inclined portion of the latch gear 112, but the teeth of the first click member 114 and the latch gear 122 are frictionally reciprocated in the reverse direction of the inclination The frictional force is canceled and the latch gear 122 is prevented from rotating in the reverse direction.

The latch gear 122 is rotatably coupled to the latch gear rotating shaft 121 by a latch gear bearing 124 and the driving gear 120 fixed to the latch gear 122 is coupled together by the rotation of the latch member 122 Rotate.

When the rotation speed of the drive gear 120 by the drive motor 111 is significantly different from the speed at which the drug pipe is driven, the rotational speed needs to be changed to precisely control the speed at which the drug pipe is driven. To this end, the drive gear 120 is engaged with the reduction gear 130 having a different gear ratio.

As shown in Fig. 7, the reduction gear rotation shaft 131 is fixed to the reduction gear 130 and rotates together. The housings 134 and 137 are provided with a bearing 133 for rotatably supporting the reduction gear rotating shaft 131. The rotation shaft 131 is provided with a rotation plate 136 and a rotation member 135 to rotate together and a plurality of interlocking cams 132 are mounted on an end of the rotation member 135 on the rotation plate 136. On the other hand, a tray on which a drug tube can be mounted can be mounted on the housings 134 and 137.

As shown in Fig. 8, the drug tube 140 is partially fixed on a tray (not shown) so that the interlocking cam 132 can be pressed while rotating. As the rotation member 135 rotates, the interlocking cam rotates while pressing the drug tube 140 in the direction of the arrow. Thus, the drug 142 flows like a squeeze in the drug tube 140. The interlocking cam 132 is rotatably engaged with the rotating member 135 to minimize friction while rotating when the interlocking cam 132 and the drug tube 140 are pressed.

The operation of the above-described latch gear 122 and the first and second click members 114 and 115 results in the rotation member 135 rotating only in one direction and not rotating in the reverse direction, Direction and does not flow backward.

Meanwhile, the speed of the actuator 112 may be adjusted to control the speed at which the interlocking member 132 presses the drug tube 140 to adjust the amount of the drug.

The term drug in the context of the present invention does not mean only a liquid medicine for treating a disease but includes all liquids which are injected into a human body without limiting its use for treatment,

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. It will be clear to those who have knowledge of.

110: driving part 111: driving motor
112: actuator 113: rod
114: first click member 115: second click member
120: drive gear 122: latch gear
121: Latch gear rotating shaft 130: Reduction gear
131: Reduction gear rotation axis 132: Interlocking cam
134, 137: Housing 136: Rotating plate
140: Drug tube 142: drug

Claims (10)

A driving unit having a driving motor and an actuator for reciprocatingly and reciprocatingly moving by the driving motor;
A latch gear which has a gear tooth having a tooth shape inclined in one direction and which rotates only in one direction in accordance with a reciprocating movement of the actuator; and a drive gear which is coaxially coupled to the first rotation shaft of the latch gear and rotates together with the latch gear A power transmission portion having a gear;
And an interlocking portion having an interlocking cam for pressing the drug tube in one direction while being rotated by rotation of the driving gear,
The actuator includes:
A rod coupled to the drive motor and reciprocating linearly;
A first click member that is rotatably coupled to an end of the rod at one end about a second rotation axis and the other end for applying a frictional force in a direction opposite to a tilt of the latch gear; And
One end of the rod is rotatably coupled to the end of the rod about the second rotation axis and the other end is provided with a protrusion corresponding to a tooth shape of the latch gear to push the gear teeth of the latch gear one by one in accordance with the linear reciprocating motion of the rod And a second click member that rotates,
And a spring is provided on the second rotation shaft to bias the other ends of the first and second click members toward each other. delete delete delete delete The method according to claim 1,
Wherein the driving motor is an osmotic pump capable of linearly reciprocating the actuator. The method according to any one of claims 1 to 6,
Further comprising a deceleration section between the power transmission section and the interlocking section. The method of claim 7,
Wherein,
A reduction gear meshing with the drive gear;
Wherein the reduction gear and the interlocking cam are connected to each other so as to rotate together,
And an interlocking device for drug injection. The method of claim 8,
The reduction gear is fixed to a reduction gear rotation shaft which rotates together,
Wherein the reduction gear rotating shaft is provided with a rotating member and rotates together,
Wherein one or more interlocking cams are mounted on an end of the rotating member so that the interlocking cam mounted on the end of the rotating member rotates to press the drug tube
Interlocking device for drug injection. The interlock as claimed in claim 9, wherein the interlocking cam is rotatably coupled to an end of the rotating member.

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