JP4322725B2 - Extrusion device for medical paste injector and medical paste injection device - Google Patents

Description

The present invention relates to an extrusion device for a medical paste injector used for injecting a paste used in the medical field into the body or a medical paste injection device in which a medical paste injector is attached to the extrusion device.

At present, in the medical field including dentistry, for example, calcium phosphate bone paste is injected into the body to make up for a defect in a living bone or a tooth, or an artificial bone made of metal, ceramics, or the like is adhered to a living bone. Yes.
The paste injection has a cylindrical shape in which a nozzle portion is formed at the tip, and a cylinder that puts the paste inside, and a piston that is slidably provided in the cylinder and pushes the paste from the nozzle portion The injector is used. Such medical paste injectors include, for example, a syringe type in which a piston rod projects from the center of the piston, and a piston that is not provided with a piston rod but is pushed by a pressing shaft of an extrusion device to be described later. There are various types and sizes.
The present applicant has already filed a patent application in which a stirring function is added to such a medical paste injector (see Patent Document 1).
JP 2000-237208 A

An extrusion device (generally a handgun type called an “injection gun”) is used as an auxiliary tool for moving a piston of a medical paste injector with a light force.
However, the conventional extrusion device has a structure in which the piston is pushed by applying its own pressing shaft to the axial center of the piston or the piston rod, so that, for example, an extrusion device compatible with a medical paste injector without a piston rod is used. When trying to set a medical paste injector having a piston rod, there is a problem that can only be applied to a specific medical paste injector such that the push shaft of the extrusion device and the piston rod do not fit each other. .

The medical paste injector according to claim 1, which has a cylindrical shape in which a nozzle portion is formed at the tip and puts a paste inside, and a piston that pushes out the paste in the cylinder from the nozzle portion. On the other hand, an extrusion device used to push out the paste by pushing the piston of the medical paste injector,
A support portion that supports the cylinder; a pressing shaft that presses the piston; and a drive unit that advances the pressing shaft;
The pressing shaft is formed so as to push the piston directly in the previous end of that as well as to strike the outer side of the position where the tip of its deviates from the axial center of the piston,
The driving means is formed by a motion conversion mechanism that converts the operation of gripping the handle lever into a forward movement of the pressing shaft, and a brake mechanism that stops the reverse movement of the pressing shaft, and the brake mechanism further includes a finger hook that releases the braking action. A push lever for medical paste in which a release lever of the type is formed, the release lever is arranged in front of the handle lever, and an operation direction for releasing the brake is made to coincide with a grip direction of the handle lever Providing equipment.

Further, as described in claim 2, a medical paste having a cylindrical shape in which a nozzle portion is formed at a tip thereof, a cylinder for putting a paste therein, and a piston for pushing out the paste in the cylinder from the nozzle portion. An extrusion device used to push the paste against the injector by pressing the piston of the medical paste injector,
A support for supporting the cylinder;
A pressing shaft that presses the piston;
Drive means for advancing the pressing shaft,
The pressing shaft is formed so as to push the piston directly in the previous end of that as well as to strike the outer side of the position where the tip of its deviates from the axial center of the piston,
The drive means is formed by a motion conversion mechanism that converts the operation of gripping the handle lever into a forward movement of the pressing shaft, and a brake mechanism that stops the reverse movement of the pressing shaft, and the handle lever is moved with respect to the gripping direction for the forward movement of the pressing shaft. On the other hand, the brake mechanism is formed with a release lever that releases the braking action, and the movement of the handle lever in the reverse direction is converted into the brake release movement of the release lever. An apparatus for extruding a medical paste injector that is provided with a motion converting mechanism is provided .

  Further, as described in claim 3, the push-out shaft is formed in a pipe shape, and the tip of the push-shaft hits around the axial center of the piston. provide.

According to a fourth aspect of the present invention, the medical paste injector has a cylindrical shape in which a nozzle portion is formed at the tip, and a cylinder that puts the paste inside, and the paste in the cylinder is removed from the nozzle portion. A piston to be pushed out, a piston rod protruding from the axial center of the piston, a detachable handle provided at the shaft end of the piston rod, and the cylinder being supported by the support portion with the handle removed An extrusion device for a medical paste injector according to any one of claims 1 to 3, wherein the device is an extrusion device.

Further, as described in claim 5, wherein the medical paste injector, medical according to any one of claims 1 to 4 agitation means to prepare a paste in the cylinder is provided An extrusion device for a paste injector is provided.

Further, as described in claim 6, wherein the stirring means of the medical paste injector, the handle and piston rod and medical according to claim 5, which is formed by the stirring blade provided at the tip of the piston rod An extrusion device for a paste injector is provided.

Further, as described in claim 7, the medical paste injector extruding device according to any one of claims 1 to 6 , wherein the paste is a bone paste.

In addition, as described in claim 8, the medical paste injector extruding device according to claim 7 , wherein the bone paste is a calcium phosphate bone paste.

Further, as described in claim 9, to provide a medical paste injection device formed by attaching a medical paste injector the extrusion device according to any one of claims 1 to 8.

The push-out device according to claim 1 has a piston rod because the tip of the pressing shaft comes into contact with an outer position outside the axial center of the piston, and the piston is directly pressed by the tip of the pressing shaft. It can be used for medical paste injectors because it does not interfere with the position of the piston rod and the position of the pressing shaft, while it can be used for medical paste injectors that do not have a piston rod. The shaft can be used to directly press the piston, and thus, a single extrusion device can be used for a plurality of different types of medical paste injectors.
In addition, when used for a medical paste injector having a piston rod, the pressing shaft and the piston rod do not interfere with each other, so there is no need for troublesome adjustment to adjust the length of the piston rod, and further from the piston. Since the later size is determined by the longer of the piston rod and the pressing shaft, the size can be reduced compared to the conventional device in which the length of the pressing shaft is simply added to the length of the piston rod. . Furthermore, since no load is applied to the piston rod, there is no need to consider the strength of the piston rod, and it is possible to deal with a wider range of medical paste injectors in terms of structure and material.
Also, if the release lever for releasing the brake is placed in front of the handle lever that moves the pressing shaft, and the operation direction of the release lever and the handle lever is matched, the operation of the release lever and the handle lever can be alternatively performed. Therefore, there is no risk of operating both levers at the same time.

Further, since the push-out device according to the second aspect operates the release lever for releasing the brake by the movement opposite to the normal operation of the handle lever, the release lever and the handle lever may be operated at the same time. In addition, since the release lever is operated by the handle lever, it is not necessary to provide a finger-holding space in front of the release lever, and the device can be made compact accordingly.

In addition, if the pressing shaft is formed in a pipe shape so as to contact around the axial center of the piston as in claim 3 , the force of the pressing shaft acts on the piston evenly, so that the piston moves smoothly. Become.

In addition, if a handle is provided on the piston rod of the medical paste injector as in claim 4 to make it detachable, only the handle needs to be removed when attaching to the extrusion apparatus of the present invention, which is convenient for manual operation. A handle with a good size and shape can be used without restrictions.

[Embodiment 1]
Embodiment 1 of the present invention will be described below with reference to the drawings. 1 is a perspective view of a medical paste injector, FIG. 2 is a longitudinal sectional view of the medical paste injector, FIG. 3 is an exploded longitudinal sectional view of a medical paste injector and an extrusion device, and FIG. 9A. FIG. 9B is a longitudinal sectional view of the medical paste injector, FIG. 9B is a longitudinal sectional view of the medical paste injector with the handle and cap removed, and FIG. 10 is an enlarged plan view of the medical paste injector.

  A medical paste injection apparatus (hereinafter simply referred to as “paste injection apparatus”) 1 of the present invention is a medical paste injection apparatus (hereinafter simply referred to as “paste injection apparatus”) 2 mounted on an extrusion apparatus 3 as an auxiliary tool. It is. First, the paste injector 2 will be described.

[Paste injector]
As shown in FIGS. 9 (a) and 9 (b), the paste injector 2 has a cylindrical shape in which a nozzle portion 4 is formed at the tip, and a cylinder 5 into which paste is put, and a slide inside the cylinder 5. It has a piston 6 that is movably provided and pushes out the paste from the nozzle portion 4. In the present invention, a paste stirring means is further added.

  The cylinder 5 is made of synthetic resin, and has an outward flange 7 projecting from the cylindrical end on the non-nozzle portion side. A cap 8 is fitted to the tip of the nozzle portion 4 so as to be removable. As shown in FIG. 10, the flange 7 has a basic shape in which the length of the long side is x and the length of the short side is y, and the short side of the rectangle has a radius x concentric with the cylinder 5. It is the form rounded to the circular arc of / 2.

  The piston 6 includes a high-strength main body 10 having a neck portion 9 for engaging a separate stop tool (not shown) and an elastic seal member 11 that is in close contact with the inner surface of the cylinder 5. A seal member 11 is integrally attached in front of. The main body 10 has a female screw hole 12 extending through the shaft center, and a screw shaft-shaped piston rod 13 that is also a constituent element of the stirring means is screwed into the female screw hole 12.

  The stirring means includes a piston rod 13 in the form of a screw shaft, a stirring blade 14 formed at the tip of the piston rod 13, and a handle 15 provided at the rear end of the piston rod 13. The piston rod 13 and the handle 15 are fitted into a square hole 15a penetrating the center of the handle 15 at a square shaft portion 13a formed at the shaft end of the piston rod 13, and further elastically deformed at the square shaft portion 13a of the piston rod 13. Possible claw pieces 13 b and 13 b are engaged with and connected to a step portion 15 b of a square hole 15 a of the handle 15. Therefore, if the claw pieces 13b, 13b of the square shaft portion 13a of the piston rod 13 are bent toward the center and disengaged from the step portion 15b of the handle 15, the handle 15 is detached from the piston rod 13. On the contrary, if the square hole 15a of the handle 15 is fitted into the square shaft portion 13a of the piston rod 13 and forcibly pushed in, the claw pieces 13b and 13b are rubbed against the inner periphery of the square hole 15a and finally bent. Engage with the portion 15b to return to the coupled state. Thus, the handle 15 is detachable from the piston rod 13.

Since the paste injector 2 of the present invention is configured as described above, the paste can be prepared directly in the cylinder 5 without using a mortar or the like.
That is, first, a paste raw material (for example, calcium phosphate powder) and a kneaded liquid (for example, distilled water) are put into the cylinder 5, and the cylinder 5 is sealed with the cap 8 and the piston 6 as shown in FIG. In the state of (a), a stop tool (not shown) is fitted from the outside to the neck portion 9 of the main body portion 10 of the piston 6 to completely lock the piston 6, and then the handle as shown by arrow I in FIG. 15 is rotated to move the piston rod 13 forward as indicated by a two-dot chain line in the same figure, and the handle 15 is reversely rotated to move the piston rod 13 backward as indicated by an arrow II in FIG. As the stirring blade 14 rotates, the paste raw material and the kneading liquid are sufficiently kneaded while moving forward and backward. If this operation is repeated 3 to 10 times, the required paste (for example, calcium phosphate bone paste) can be obtained.
In this state, the locking tool is removed from the neck 9 to unlock the piston 6, and the handle 15 is detached from the piston rod 13 as shown in FIG.

  The paste injector 2 of the present invention can also be manually injected with the handle 15 attached. That is, after the paste is adjusted in the cylinder 5 as described above, the stopper tool is removed to unlock the piston 6, the cap 8 of the nozzle portion 4 is removed and replaced with a predetermined tube, and the flange 7 of the cylinder 5 is replaced. If it is fixed and the handle 15 is pushed in by hand, the piston 6 moves forward integrally with the piston rod 13 and the paste in the cylinder 5 is pushed out.

[Extruding equipment]
As shown in FIG. 3, the extrusion device 3 includes a support portion 16 that supports the cylinder 5, a pressing shaft 17 that presses the piston 6, and drive means 18 that advances the pressing shaft 17. .

  The support portion 16 includes a metal support base 20 having a component space 19 therein, and a support key portion 21 in which a metal strip is bent into a square C shape. The support base 20 has a lower half portion as a grip portion 22 and has a shape suitable for holding with one hand. On the other hand, the support key portion 21 has an inner dimension in the height direction set to be substantially the same as the length x of the flange 7 of the cylinder 5, and the height of the front split portion 21 a is the flange of the cylinder 5. 7 is set slightly larger than the length y.

  The pressing shaft 17 is a metal pipe having an inner diameter larger than that of the piston rod 13 of the paste injector 2 and further longer than the piston rod 13. Therefore, the piston rod 13 of the paste injector 2 is completely contained in the pressing shaft 17. The pressing shaft 17 is slidably supported by two bearings 23, 23 provided on the center of the support key portion 21 of the support portion 16 and the rear wall 20 a of the support base 20. Note that retaining rings 17a and 17a for retaining are fitted to both ends of the pressing shaft 17.

  The drive means 18 includes a handle lever 25 pivotally mounted on the upper portion of the grip portion 22 of the support base 20 by a horizontal shaft 24 and a part of the support base 20 in the component space 19 and slightly on the outer periphery of the pressing shaft 17. The feed wheel pawl 26 that is loosely fitted with the play, the feed spring 27 that is externally attached to the pressing shaft 17 to urge the feed wheel pawl 26 backward, the lower end of the feed wheel pawl 26, and the upper end of the handle lever 25 A link 28 that mechanically connects the feed wheel pawl 26 and the handle lever 25 with both ends thereof pivotally attached, and a slight play on the outer periphery of the pressing shaft 17 outside the rear wall 20a of the support base 20 A release lever 29 that is loosely fitted and hooked on the upper edge of the rear wall 20a of the support base 20 so as to be swingable, and an outer side of the pressing shaft 17 to urge the release lever 29 backward. Consisting of the brake spring 30. Among these elements, the feed wheel pawl 26, the feed spring 27, and the link 28 constitute a motion conversion mechanism that converts an operation of gripping the handle lever 25 into a forward motion of the pressing shaft 17. Further, the release lever 29 and the brake spring 30 constitute a brake mechanism that stops the reverse movement of the pressing shaft 17.

The drive means 18 of the extrusion device 3 is configured as described above. When the handle lever 25 is gripped by the fingertip while holding the grip portion 22 of the support base 20 as shown by a two-dot chain line in FIG. And the link 28 moves forward, and the lower side of the feed claw 26 is pulled forward by the link 28.
As a result, the feed wheel pawl 26 is slightly tilted and twisted on the pressing shaft 17, so that the press shaft 17 moves forward together with the feed wheel pawl 26 due to an increase in frictional resistance accompanying the twist.
On the other hand, the release lever 29 of the brake mechanism is slightly tilted with the upper edge of the rear wall 20a of the support base 20 as a fulcrum when pressed by the brake spring 30 and is always twisted on the pressing shaft 17. Since the advancement of the pressing shaft 17 acts as a force in a direction to cancel the twisting against the twisting of the release lever 29, the release lever 29 does not function as a brake against the advancement of the pressing shaft 17. On the other hand, since the retraction of the pressing shaft 17 acts as a force in a direction that increases the twisting of the release lever 29, the release lever 29 exhibits a braking force with respect to the retraction of the pressing shaft 17.
Accordingly, when the force of the handle lever 25 grasped earlier is loosened, the feed wheel pawl 26 and the handle lever 25 are moved backward by the urging of the feed spring 27. At this time, since the line of action of the force of the feed spring 27 and the axis of the pressing shaft 17 substantially coincide with each other, the feeding wheel pawl 26 moves freely on the pressing shaft 17 without being twisted. In addition, since the brake force in the reverse direction is always applied to the pressing shaft 17 by the release lever 29, there is no possibility that the pressing shaft 17 moves backward due to the backward movement of the feed wheel claw 26.

  As described above, the pressing shaft 17 is advanced by a predetermined amount by the operation of grasping and loosening the handle lever 25 once. Therefore, if the operation is executed a plurality of times, the pressing shaft 17 can be advanced by a necessary amount. Note that reference numeral 31 in FIG. 3 denotes a feed adjusting means for adjusting the amount of advancement (feeding amount) of the pressing shaft 17 per time. The feed adjusting means 31 is a rotary dial type, and is provided on a side surface of the dial 33 with a disc-shaped dial 33 that is rotatable by a rotary shaft 32 provided in the grip portion 22 and a distance from the rotary shaft 32. Are formed by a plurality of stop pins 34, 34, 34 and a sphere 36 that engages with small holes 35, 35... (See FIG. 1) penetrating the grip portion 22 and simply fixes the movement of the dial 33. When adjusting the feed amount of the shaft 17, the dial 33 is turned with a fingertip from an adjustment window 37 provided on the rear surface of the grip portion 22, and any one stop pin 34 is caused to face in the swinging region of the handle lever 25. As a result, the handle lever 25 hits the stop pin 34 and the swinging range of the handle lever 25 is reduced accordingly, so the delivery amount of the pressing shaft 17 is naturally reduced. As shown in the figure, the dial 33 of the embodiment is provided with three stop pins 34, 34, 34. Therefore, the feed amount of the pressing shaft 17 including the setting that none of the stop pins 34, 34, 34 is used. Can be set in 4 ways. In the embodiment, one of the stop pins 34 is formed in a cylindrical shape, and a spring (not shown) is provided therein, and the sphere 36 is pressed against the small hole 35 of the grip portion 22 by the spring.

[Paste injection device]
The paste injection device 1 is obtained by mounting the paste injector 2 on the extrusion device 3. As described above, since the paste injector 2 is prepared in the cylinder 5 and the handle 15 is removed from the piston rod 13, the paste injector 2 is supported by the support key portion 21 as shown in FIG. And the end of the piston rod 13 is inserted toward the center of the pressing shaft 17. At this time, the split portion 21a of the support key portion 21 is passed with the flange 7 of the cylinder 5 oriented in a landscape orientation. When the cylinder 5 is rotated 90 degrees around the piston rod 13 in the support key portion 21, the flange 7 is engaged with the support key portion 21 and cannot be removed. Thus, the attachment of the paste injector 2 to the support portion 16 is completed, and the tip of the pressing shaft 17 is in a donut shape around the axial center of the piston 6.
In this state, when the cap 8 fitted to the nozzle portion 4 of the paste injector 2 is removed and a tube or the like is connected to the nozzle portion 4 and then the handle lever 25 is operated, the pressing shaft 17 moves forward in the above-described manner. The piston 6 is directly pressed at the tip of the shaft 17, and the paste in the cylinder 5 is pushed out from the nozzle portion 4, which is injected into the body through the tube.
When the injection of the predetermined amount is completed, first, the lower side of the release lever 29 is pushed toward the support base 20 to cancel the slight inclination of the release lever 29 with respect to the pressing shaft 17. This eliminates the frictional resistance of the release lever 29 due to twisting and the brake is released, so that the release lever 29 can be easily pulled back with the pressing shaft 17. After that, when the cylinder 5 is rotated 90 degrees, the flange 7 is oriented horizontally and disengaged from the support key portion 21, so that the paste injector 2 is detached from the support portion 16 when pulled as it is. The piston 6 of the paste injector 2 returns to its original position when the piston rod 13 is pulled.

[Embodiment 2]
4 and 5 show a second embodiment of the extrusion device 3, FIG. 4 is a longitudinal sectional view of a medical paste injection device, and FIG. 5 is an enlarged view of a main part of FIG. 4 and 5, the same reference numerals as those in FIGS. 1 to 3 indicate the same or the same functions as those in the first embodiment, and thus detailed description thereof is omitted.

  The feature of the second embodiment is the arrangement and form of the release lever 29 constituting the brake mechanism. That is, in the second embodiment, the release lever 29 is a finger-hook type, and is disposed in front of the handle lever 25 as shown in FIGS. 4 and 5, and the operation direction for releasing the brake (FIG. 5). (See arrow III) matches the grip direction of the handle lever 25 (arrow IV in FIG. 5). By doing so, the operation of the release lever 29 and the handle lever 25 becomes alternative. For example, the release lever 29 is operated to return the pressing shaft 17 at the stage where a predetermined amount of injection has been completed. There is no fear that the handle lever 25 will be gripped to leak paste. Further, simultaneous operation of the release lever 29 and the handle lever 25 may cause a trouble that the pressing shaft 17 does not move in either direction, but as long as the operation of the release lever 29 and the handle lever 25 is alternative. Such trouble does not occur.

  The feed adjusting means 31 of the second embodiment is of a push lever type, a retractable lever 38 provided at the upper rear end of the support base 20, a washer-like spring 39 for supporting the lever 38 in the raised position, The hook 38a is formed on the lower surface of the lever 38. When a finger is placed on the lever 38 and pressed in the direction indicated by the arrow V in FIG. 5, the lever 38 is lowered and the hook 38a enters the moving area of the feed wheel pawl 26. enter. As a result, the feed wheel pawl 26 comes into contact with the catch portion 38a and stops, so that the moving range of the feed wheel pawl 26 is restricted to be short. Further, when the finger is released from the lever 38, the force is restored to the original posture by the force of the spring 39, and the hooking portion 38a is disengaged from the moving area of the feed wheel pawl 26, so that the restriction is released. Therefore, there are two types of setting of the feed amount of the pressing shaft 17 of this embodiment.

[Embodiment 3]
6 to 8 show a third embodiment of the extrusion apparatus 3. FIG. 6 is a longitudinal sectional view of a medical paste injection apparatus, FIG. 7 is an enlarged view of a main part of FIG. 6, and FIG. FIG. 6 to 8, the same reference numerals as those in FIGS. 1 to 5 indicate the same or the same functions as those in the first or second embodiment, and thus detailed description thereof is omitted.

  In the third embodiment, the release lever 29 is provided in front of the handle lever 25 as in the second embodiment. On the other hand, as shown in FIG. 7, the handle lever 25 does not affect the feed wheel pawl 26 by making the shaft hole 28 a of the link 28 longer to have play (so-called long hole shape). The pressing shaft 17 is formed so as to be movable in the reverse direction (see the two-dot chain line in FIG. 7) with respect to the gripping direction for advancing the pressing shaft 17 described so far. In order to convert the movement (displacement) of the handle lever 25 in the reverse direction into the brake release movement of the release lever 29, the lower half portion of the release lever 29 is bent rearward and substantially arcuate and arcuate. In other words, the front wall 25a of the handle lever 25 is in contact with the bent bent outer surface, in other words, so that the front wall 25a of the handle lever 25 covers the lower half of the front surface of the release lever 29. Such a combination of the release lever 29 and the handle lever 25 becomes a motion conversion mechanism that converts the movement of the handle lever 25 in the direction indicated by the arrow VI in FIG. 7 into the brake release motion of the release lever 29. That is, when the handle lever 25 is swung in the direction of arrow VI in FIG. 7 in the state of the solid line in FIG. 7, the top of the front wall 25a of the handle lever 25 rises in an arc centering on the horizontal axis 24, When pushed by the movement, the release lever 29 swings in the brake release execution direction as shown by a two-dot chain line in FIG. At this time, as the force is applied to the free end (lower end) side of the handle lever 25, a stronger force can be transmitted to the release lever 29 by lever action. When the handle lever 25 is gripped in the gripping direction for moving forward the pressing shaft 17 (indicated by the arrow VII in FIG. 6), the front wall 25a of the handle lever 25 and the release lever 29 are completely separated by bending of the lower half of the release lever 29. Does not interfere. Therefore, the pressing shaft 17 can be advanced without any trouble.

  The feed adjusting means 31 of the third embodiment is a rotation type of the push lever type of the second embodiment, and as shown in FIG. 8, a rotatable cover provided at the upper rear end of the support base 20. 40 and a fixing pin 41 fixed to the cover 40. When the cover 40 is rotated in the direction indicated by the arrow VIII in FIG. 8, the fixing pin 41 moves and enters the moving region of the feed ring pawl 26. Then, as in the second embodiment, since the feed wheel pawl 26 hits the stop pin 41 and stops, the movement range of the feed wheel pawl 26 is restricted to be short. Further, when the cover 40 is returned to the original position, the stop pin 41 is removed from the moving area of the feed wheel pawl 26, so that the restriction is released. Accordingly, the setting of the delivery amount of the pressing shaft 17 of the third embodiment is also two different in length, as in the second embodiment.

  Since the extrusion device 3 according to the third embodiment has no fear of operating the release lever 29 and the handle lever 25 at the same time, the same advantages as those of the second embodiment can be obtained. Further, while the pushing device 3 of the second embodiment requires a finger-hanging space before the release lever 29, in this third embodiment, the handle lever 25 is used to operate the release lever 29. Is unnecessary, and the apparatus can be made compact accordingly.

  The embodiments of the present invention have been described above, but the present invention is of course not limited to the above embodiments. For example, in the embodiment, the driving means of the pressing shaft 17 is a manual operation method using the handle lever 25, but an electric driving source such as a motor or a solenoid or a driving source based on fluid pressure such as hydraulic pressure or pneumatic pressure may be used. Good. In the embodiment, the frictional force generated by the claw is used as the motion conversion mechanism. However, as long as the operation of gripping the handle lever 25 can be converted into the forward motion of the pressing shaft 17, mechanical elements such as gears and cams are appropriately combined. You may do it.

  In the embodiment, the pressing shaft 17 is formed of a pipe, but the pressing shaft 17 may be formed of a solid shaft. In this case, the piston 6 can be pressed in a well-balanced manner by providing a plurality of solid shafts and arranging them evenly around the axial center of the piston 6.

  In the embodiment, the paste injector 2 having the piston rod 13 is attached to the extrusion device 3 of the present invention. Of course, the paste injector 2 without the piston rod 13 can also be attached. Moreover, although the paste injector 2 of embodiment adds the stirring function, the extrusion apparatus 3 of this invention is applicable also to the paste injector 2 without such a stirring function.

It is a perspective view of a paste injection apparatus. It is a longitudinal cross-sectional view of a paste injection apparatus. It is the longitudinal cross-sectional view which decomposed | disassembled the paste injection device and the extrusion apparatus. It is a longitudinal cross-sectional view of the paste injection apparatus which shows another form. It is a principal part enlarged view of FIG. It is a longitudinal cross-sectional view of a medical paste injection device. It is a principal part enlarged view of FIG. It is the XX sectional view taken on the line of FIG. (A) is the longitudinal cross-sectional view of a paste injector, (b) is the longitudinal cross-sectional view which removed the handle and cap of the paste injector. It is an enlarged plan view of a paste injector.

DESCRIPTION OF SYMBOLS 1 ... Medical paste injection apparatus 2 ... Medical paste injection device 3 ... Extrusion apparatus 4 ... Nozzle part 5 ... Cylinder 6 ... Piston 13 ... Piston rod 15 ... Handle 16 ... Support part 17 ... Pressing shaft 18 ... Drive means 25 ... Handle Lever 29 ... Release lever

Claims (9)

A medical paste injector for a medical paste injector having a cylindrical shape in which a nozzle portion is formed at the tip and containing a paste inside, and a piston for extruding the paste in the cylinder from the nozzle portion. An extruding device used to push out the paste and extrude the paste,
A support portion that supports the cylinder; a pressing shaft that presses the piston; and a drive unit that advances the pressing shaft;
The pressing shaft is formed so as to push the piston directly in the previous end of that as well as to strike the outer side of the position where the tip of its deviates from the axial center of the piston,
The driving means is formed by a motion conversion mechanism that converts the operation of gripping the handle lever into a forward movement of the pressing shaft, and a brake mechanism that stops the reverse movement of the pressing shaft, and the brake mechanism further includes a finger hook that releases the braking action. A release lever of the type is formed, this release lever is arranged in front of the handle lever, and the operation direction for executing the brake release is made to coincide with the grip direction of the handle lever . Paste injector extrusion equipment. A medical paste injector for a medical paste injector having a cylindrical shape in which a nozzle portion is formed at the tip and containing a paste inside, and a piston for extruding the paste in the cylinder from the nozzle portion. An extruding device used to push out the paste and extrude the paste,
A support for supporting the cylinder;
A pressing shaft that presses the piston;
Drive means for advancing the pressing shaft,
The pressing shaft is formed so as to push the piston directly in the previous end of that as well as to strike the outer side of the position where the tip of its deviates from the axial center of the piston,
The drive means is formed by a motion conversion mechanism that converts the operation of gripping the handle lever into a forward movement of the pressing shaft, and a brake mechanism that stops the reverse movement of the pressing shaft, and the handle lever is moved with respect to the gripping direction for the forward movement of the pressing shaft. On the other hand, the brake mechanism is formed with a release lever that releases the braking action, and the movement of the handle lever in the reverse direction is converted into the brake release movement of the release lever. An extruding device for a medical paste injector, characterized in that a motion converting mechanism is provided . Extrusion apparatus for medical paste injector according to claim 1 or 2, characterized in that the tip has to strike around the axial center of the piston the pressing shaft formed in a pipe shape. The medical paste injector has a cylindrical shape in which a nozzle portion is formed at the tip, and has a cylinder that puts the paste inside, and a piston that pushes the paste in the cylinder from the nozzle portion, and the shaft of the piston 2. A piston rod projecting from the center of the piston rod, and a detachable handle provided at a shaft end of the piston rod, the cylinder being supported by the support portion with the handle removed. The extrusion apparatus of the medical paste injector of any one of thru | or 3. The medical paste injector, extrusion medical paste injector according to any one of claims 1 to 4, characterized in that stirring means for the preparation of a paste in the cylinder is provided apparatus. 6. The extrusion of the medical paste injector according to claim 5 , wherein the stirring means of the medical paste injector is formed by the handle, the piston rod, and a stirring blade provided at the tip of the piston rod. Equipment . The extrusion apparatus for a medical paste injector according to any one of claims 1 to 6 , wherein the paste is a bone paste. The extrusion apparatus for a medical paste injector according to claim 7, wherein the bone paste is a calcium phosphate bone paste. A medical paste injection apparatus, comprising a medical paste injector attached to the extrusion apparatus according to any one of claims 1 to 8 .

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