JP2019195552A - Medical paste kneading injector - Google Patents

Abstract

To provide a medical paste kneading injector that facilitates removal from a shaft of a stopper for extrusion.SOLUTION: A medical paste kneading injector includes: a cylinder; a partition tool capable of sliding in an axial direction of the cylinder at the inside of the cylinder; a shaft inserted in the through-hole penetrating the center of the partition tool, and enabling a reciprocating motion coming and going in a through-hole and a rotational motion around a shaft line; an agitation part provided at the shaft; a handle part fixed into a portion being a rear end of the shaft and positioned outside the cylinder; and a stopper 5 for extrusion removably mounted on an outer circumferential surface of the shaft. The stopper 5 for extrusion includes a stopper body part 35, a first fitting recess 33A and a second fitting recess 33B fitted to the outer circumferential surface of the shaft, and a tabular grip part 39 protruding in a direction intersecting with a direction going from one end to the other end in one end of the stopper body part 35.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a medical paste kneading injector.

  In the medical field and the like, a medical paste kneading and injection device for kneading and injecting a medical paste (for example, calcium phosphate bone paste) has been put into practical use (see Patent Document 1).

The medical paste kneading injector disclosed in Patent Document 1 is inserted into a cylinder having a nozzle portion, a partition that can slide in the cylinder in the axial direction, and a through-hole of the partition, and reciprocating and rotating. A shaft capable of moving and a handle provided at an end of the shaft are provided. The medical paste kneading and injector is further provided with an extrusion stopper.
This extrusion stopper is attached to the shaft when the bone paste is extruded from the medical paste kneading and injector.

  Here, the outline of the work flow using the medical paste kneading injector will be described. When kneading bone paste using a medical paste kneading injector, first, the extrusion stopper is removed from the outer peripheral surface of the shaft. In this state, by operating the handle portion, the rotational movement of the shaft around the axis and the reciprocating movement in the axial direction are combined. Thereby, the bone paste is kneaded by the stirring portion provided at the tip of the shaft. After the bone paste is kneaded, the extrusion stopper is mounted again on the outer peripheral surface of the shaft. Thereafter, by pushing the handle portion, the partition member is pushed into the cylinder together with the shaft, and the bone paste in the cylinder is pushed out of the cylinder.

Thus, when kneading, it is necessary to remove the extrusion stopper from the outer peripheral surface of the shaft.
Therefore, ease of removal of the extrusion stopper is one of the important points in operating the medical paste kneading and injector.

JP-A-2006-36402

However, in the technique of the above-mentioned Patent Document 1, as shown in FIG. 8, finger hooks 203 are provided on both side surfaces of the extrusion stopper 201. Therefore, depending on how to put on the finger, as shown in FIG. 9, the shaft 205 is sandwiched over the extrusion stopper 201, which may make it difficult to remove. In FIG. 9, the arrow indicates the removal direction.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a medical paste kneading and injector that can easily remove the stopper for extrusion from the shaft. The present invention can be realized as the following forms.

(1) a cylindrical main body,
A cylindrical nozzle part located on the front side of the main body part and having a smaller inner diameter than the main body part,
A cylinder having a reduced diameter portion provided between the main body portion and the nozzle portion and having an inner diameter reduced from the main body portion toward the nozzle portion;
A partition that can slide inside the cylinder in the direction of the axis of the cylinder;
A shaft that is inserted into a through-hole penetrating the center of the partitioning tool, and capable of reciprocating in the direction of the axis that goes in and out of the through-hole and rotating around the axis;
A stirring portion provided at a portion located in the cylinder at the front end of the shaft;
A handle portion fixed to a portion of the rear end of the shaft located outside the cylinder;
An extrusion stopper that functions as a spacer for maintaining a gap between the partition and the handle portion, and is attached to the outer peripheral surface of the shaft in a detachable state;
A medical paste kneading injector comprising:
The extrusion stopper is
A stopper body extending from one end to the other end, a fitting recess fitted to the outer peripheral surface of the shaft, and a direction intersecting the direction from the one end to the other end at one end of the stopper body A flat plate-like gripping part protruding to
The medical paste kneading / injecting device, wherein the extrusion stopper is attached to the shaft so that the gripping portion is located on a rear end side in the direction of the axis.

  In this configuration, a flat plate-shaped gripping part that protrudes in a direction crossing the direction from one end to the other end of the stopper main body is provided. Therefore, when removing the stopper for extrusion, even if the gripping part is held, the shaft The stopper for extrusion is easy to remove.

(2) The gripping portion is formed when the shaft is pushed into the cylinder and the stirring portion comes into contact with the inner surface of the reduced diameter portion in a state where the pushing stopper is fitted to the shaft. Further, the medical paste kneading and injecting device according to (1), wherein the grip portion and the cylinder do not interfere with each other.

  When the bone paste is extruded, an extrusion stopper enters the cylinder. In this configuration, the gripping portion and the cylinder are formed when the shaft is pushed into the cylinder with the extrusion stopper fitted to the shaft and the agitating portion contacts the inner surface of the reduced diameter portion. The position where no interference occurs. That is, even if the shaft is pushed until the stirring portion comes into contact with the inner surface of the reduced diameter portion, the grip portion and the cylinder do not interfere with each other, so that the bone paste can be pushed out from the cylinder almost completely.

(3) The grip portion includes a wide portion that is widened in a direction intersecting with a direction from the one end to the other end from a coupling portion with the stopper main body (1) or The medical paste kneading injector according to (2).

  According to this structure, since the holding part has a wide part, it is easy to hold and the operability of the kneading injector is good.

It is sectional drawing which shows the structure of the medical paste kneading injector in this embodiment. It is a side view which shows the medical paste kneading injector in this embodiment. It is a perspective view which shows the stopper for extrusion seen from the back side. It is a perspective view which shows the stopper for extrusion seen from the inner surface side. It is explanatory drawing which shows the mounting method of the stopper for extrusion. It is sectional drawing which shows the medical paste kneading injection device at the time of paste injection | pouring (The arrow in FIG. 6 shows the extrusion direction of a bone paste). It is sectional drawing which shows the state at the time of removing the stopper for extrusion from the outer peripheral surface of a shaft (in FIG. 7, the arrow shows a removal direction). It is a perspective view which shows the stopper for extrusion in the medical paste kneading injection device of a prior art example. FIG. 10 is a cross-sectional view showing a state when the extrusion stopper is removed from the outer peripheral surface of the shaft in the medical paste kneading and injector of the conventional example (in FIG. 9, the arrow indicates the removal direction).

Hereinafter, an embodiment of a medical paste kneading injector 1 will be described in detail with reference to the drawings. In the following description, the nozzle part 13 side (left side in FIG. 1) of the cylinder 2 of the medical paste kneading and injector 1 is the front side, and the handle part 24 side (right side in FIG. 1) of the medical paste kneading and injector 1 is shown. ) Is the rear side.
FIG. 1 is a cross-sectional view showing a schematic configuration of a medical paste kneading / injecting device 1 according to the present embodiment, and FIG. 2 is a side view showing the medical paste kneading / injecting device 1.

  As shown in FIGS. 1 and 2, the medical paste kneading and injector 1 of this embodiment includes a cylinder 2, a piston 3, a fixing member 4, an extrusion stopper 5, and the like. The medical paste kneading and injector 1 is an instrument for kneading and injecting bone paste (medical paste) containing, for example, calcium phosphate as a main component. The bone paste is, for example, a white paste.

  The cylinder 2 includes a cylindrical body 11 (corresponding to a “cylindrical main body”) having an opening 10 at the rear end. Bone paste is held inside the cylindrical body 11. A flange portion 12 is provided at the rear end of the cylindrical body 11, and a cylindrical nozzle portion 13 having an outer diameter and an inner diameter smaller than those of the cylindrical body 11 is provided in front of the cylindrical body 11. The cylindrical body 11 and the nozzle portion 13 are connected by a reduced diameter portion 17. The nozzle portion 13 has a screw 14 on the outer periphery thereof, and a cap 15 having a substantially cylindrical shape is screwed to the screw 14. Further, by removing the cap 15, a tube 63, an injection needle or the like can be attached to the nozzle portion 13. The cap 15 is formed to be equal to or slightly larger than the diameter of the cylindrical body 11. The flange portion 12 is formed in an oval bowl shape that protrudes outward from the opening end side of the cylindrical body 11, and the oval curved side 16 projects greatly to the outside of the cylindrical body 11.

  The piston 3 includes a partitioning tool 21, a shaft 22, a stirring part 23, and a handle part 24. The fixing member 4 is detachably fixed to the flange portion 12 of the cylindrical body 11 and engages with a partitioning member 21 arranged on the opening 10 side of the cylindrical body 11. Here, the engaging portion 4A of the fixing member 4 is engaged so as to surround the periphery of the engaging portion 21A of the partitioning tool 21. As a result, the partition 21 is fixed at the opening end of the cylindrical body 11 so that it cannot rotate and cannot move forward and backward.

  The partition member 21 is a synthetic resin part that partitions the inside and the outside of the cylinder 2 and that can slide in the cylinder 2 in the axial direction D1 of the cylinder 2. A through hole 26 is formed in the partition 21 so as to penetrate the center thereof, and a shaft 22 is inserted into the through hole 26.

  The shaft 22 is a synthetic resin round bar colored in a color different from the bone paste (for example, green). The shaft 22 is provided so as to be capable of reciprocating in the axial direction D1 of the cylinder 2 and rotating in the circumferential direction around the axis by entering and exiting the through hole 26 of the partition 21. The shaft 22 is formed such that the length in the longitudinal direction is slightly longer than the depth of the cylindrical body 11 of the cylinder 2. A stirring portion 23 having a plurality of radially projecting blades is provided at a portion of the front end 28 of the shaft 22 located inside the cylinder 2. A handle portion 24 is fixed to a portion of the rear end 29 of the shaft 22 located outside the cylinder 2. The handle portion 24 is made of a resin such as polycarbonate.

  As shown in FIGS. 1, 5, and 6, the extrusion stopper 5 functions as a spacer that keeps a distance between the partition 21 and the handle portion 24. The extrusion stopper 5 is attached to the outer peripheral surface 30 of the shaft 22 in a detachable state. As shown in FIGS. 3 and 4, the extrusion stopper 5 includes a stopper main body 35 extending from one end to the other end, and a first fitting recess 33 </ b> A (fitted to the outer peripheral surface 30 of the shaft 22 ( A concave inner surface) and a second fitting concave portion 33B (concave inner surface), and a flat plate-like gripping portion 39 projecting in a direction intersecting the direction from one end to the other end at one end of the stopper main body 35. . As shown in FIG. 6, the gripping portion 39 is formed at the inner surface of the reduced diameter portion 17 when the shaft 22 is pushed into the cylinder 2 with the extrusion stopper 5 fitted to the shaft 22. The grip part 39 and the cylinder 2 do not interfere with each other when they are in contact with each other. The grip portion 39 has a wide portion 39B that is widened from a coupling portion 39A to the stopper main body portion 35 in a direction intersecting with a direction from one end of the stopper main body portion 35 toward the other end (FIG. 3). reference). You may utilize this wide part 39B as printing spaces, such as a character. The pushing stopper 5 is in a state in which the front end surface 35A of the stopper main body portion 35 is in contact with the rear end surface 21B of the partition member 21 and the rear end surface 35B of the stopper main body portion 35 is in contact with the front end surface 24A of the handle portion 24. Thus, it is fitted on the shaft 22 (see FIG. 5 and the like). The extrusion stopper 5 of the present embodiment is formed using the same resin material as the shaft 22 and the handle portion 24, specifically, polycarbonate. In addition, on the back surface 37 of the stopper main body portion 35, the outer edge 37A other than the portion where the grip portion 39 is formed is a chamfered portion with a corner cut off. A flat portion 37B is provided on the back surface 37, and the flat portion 37B may be used as a printing space for characters and the like.

  In the stopper main body 35 of the extrusion stopper 5, first sandwiching pieces 45 </ b> A and 45 </ b> A and second sandwiching pieces 45 </ b> B and 45 </ b> B that sandwich the outer peripheral surface 30 of the shaft 22 are formed at both ends separated in the axial direction D <b> 1. . More specifically, a pair of first sandwiching pieces 45A and 45A are provided at a position including the front end in the axial direction D1 in the stopper body 35, and a pair of second sandwiching pieces 45B and 45A are disposed at a position including the rear end in the axial direction D1. 45B is provided. The inner surfaces of the pair of first clamping pieces 45A, 45A are first fitting recesses 33A. 33 A of 1st fitting recessed parts are formed in the circular arc shape curved with the same curvature as the outer peripheral surface 30 of the shaft 22, and the angle of the circular arc is a concave surface larger than a semicircle. The inner surfaces of the pair of second clamping pieces 45B, 45B are second fitting recesses 33B. The second fitting recess 33 </ b> B is formed in an arc shape curved with the same curvature as that of the outer peripheral surface 30 of the shaft 22, and the arc angle is a concave surface larger than a semicircle. The first clamping pieces 45A and 45A have flexibility, and the shaft 22 is fitted into the first fitting recess 33A by bending the distal end sides of the first clamping pieces 45A and 45A. Similarly, the second sandwiching pieces 45B and 45B have flexibility, and the shaft 22 is fitted into the second fitting recess 33B by bending the tip side of the second sandwiching pieces 45B and 45B. In this way, the first fitting recess 33A and the second fitting recess 33B are fitted to the outer peripheral surface 30 of the shaft 22. The first fitting recess 33A and the second fitting recess 33B are provided away from each other in the axial direction D1.

  In the stopper main body portion 35, a connecting support portion 47 is provided between the first clamping pieces 45A and 45A and the second clamping pieces 45B and 45B in the axial direction D1. The inner surface 48 of the connection support portion 47 is a semicircular concave surface curved with the same curvature as the outer peripheral surface 30 of the shaft 22. When the extrusion stopper 5 is mounted, the outer peripheral surface 30 of the shaft 22 is disposed along the inner surface 48 of the connection support portion 47. The outer peripheral surface 30 of the shaft 22 is only in contact with the inner surface 48 of the connection support portion 47 and does not have a function of fitting the outer peripheral surface 30 of the shaft 22.

  The extrusion stopper 5 mounted on the outer peripheral surface 30 of the shaft 22 pushes the partition 21 together with the shaft 22 into the cylinder 2 to discharge the medical paste from the cylinder 2 (see FIG. 6).

  Next, the effect of the medical paste kneading and injector 1 configured as described above will be described.

  First, the raw material powder of the paste is stored in the cylinder 2 in advance. An operator such as a doctor or a nurse removes the cap 15 screwed to the nozzle portion 13 of the cylinder 11 of the cylinder 2. Then, the operator injects a liquid for curing the raw material of the paste from the nozzle portion 13 into the cylinder 2 and fastens the cap 15 to the nozzle portion 13 again. Further, the operator removes the extrusion stopper 5 from the outer peripheral surface 30 of the shaft 22 by grasping and pulling the grip portion 39 of the extrusion stopper 5 (see FIG. 2).

  Thereafter, the operator operates the handle portion 24 to perform both the rotational motion of the piston 3 in the circumferential direction around the axis of the cylinder 2 and the reciprocating motion of the piston 3 in the axial direction D1. At this time, the shaft 22 enters and exits the through hole 26 of the partitioning tool 21, and the powder paste raw material and the liquid are kneaded by the stirring unit 23 provided at the front end 28 of the shaft 22. Thus, since the bone paste is kneaded in the cylinder 2 partitioned by the partitioning tool 21, mixing of foreign matters during kneading is avoided.

  After the kneading of the bone paste is completed, the operator pulls the shaft 22 of the piston 3 back toward the rear and fully attaches the extrusion stopper 5 to the outer peripheral surface 30 of the shaft 22 in this state (FIG. 5). reference). At this time, the operator fits the first fitting recesses 33 </ b> A of the first clamping pieces 45 </ b> A and 45 </ b> A into the outer peripheral surface 30 of the shaft 22 with the pushing stopper 5 tilted. Thereafter, the operator attaches the extrusion stopper 5 by fitting the second fitting recesses 33 </ b> B of the second holding pieces 45 </ b> B and 45 </ b> B into the outer peripheral surface 30 of the shaft 22.

  Next, the operator removes the fixing member 4 from the flange portion 12 and the divider 21. Further, as shown in FIG. 6, the operator pushes the handle portion 24 forward after removing the cap 15 of the nozzle portion 13, thereby pushing the piston 3 into the cylinder 2. At this time, the partition 21 moves together with the shaft 22 in the cylinder 2 in the axial direction D1. Then, the bone paste in the cylinder 2 is pressed out through the nozzle portion 13 as the partition member 21 moves.

  In the medical paste kneading / injecting device 1 of the present embodiment, a grip portion 39 is provided at one end of the stopper main body 35 so as to protrude in a direction intersecting with the direction from one end to the other end. Therefore, when removing the stopper 5 for extrusion from the outer peripheral surface 30 of the shaft 22, even if the grip part 39 is picked, the force does not sandwich the shaft 22, and the stopper 5 for extrusion is easily removed (see FIG. 7). . In FIG. 7, the arrow indicates the removal direction.

  The gripping portion 39 is formed when the shaft 22 is pushed into the cylinder 2 with the pushing stopper 5 fitted to the shaft 22 and the stirring portion 23 comes into contact with the inner surface of the reduced diameter portion 17. The grip portion 39 and the cylinder 2 do not interfere with each other. Therefore, even if the shaft 22 is pushed until the stirring portion 23 contacts the inner surface of the reduced diameter portion 17, the grip portion 39 and the cylinder 2 do not interfere with each other, so that the bone paste can be pushed out from the cylinder 2 almost completely ( (See FIG. 6).

  Further, in the medical paste kneading / injecting device 1 of the present embodiment, the gripping portion 39 is directed in a direction intersecting with the direction from one end to the other end of the stopper main body portion 35 from the coupling portion 39A with the stopper main body portion 35. The wide portion 39B is wide. Since the wide portion 39B makes it easy to grip the grip portion 39, the operability of the medical paste kneading and injector 1 is good. That is, it is easy to remove the extrusion stopper 5 from the outer peripheral surface 30 of the shaft 22.

  Further, in the medical paste kneading / injecting device 1 of the present embodiment, the outer edge 37 </ b> A other than the formation portion of the grip portion 39 is a chamfered portion with a corner cut off on the back surface 37 of the stopper main body portion 35. Therefore, when the extrusion stopper 5 is gripped, it is possible to prevent a finger from being accidentally placed on the outer edge 37A of the back surface 37.

In the medical paste kneading / injecting device 1 of the present embodiment, a gripping portion 39 is formed substantially perpendicular to the back surface 37 of the stopper main body portion 35. In other words, the flat grip portion 39 protrudes substantially perpendicularly to the direction from one end of the stopper main body portion 35 to the other end.
When the gripping portion 39 has an acute angle or an obtuse angle that is not substantially perpendicular to the back surface 37, the direction of the force for pulling the gripping portion 39 when removing the extrusion stopper 5 from the shaft 22 is the removal direction of the extrusion stopper 5. Because it is different, it becomes difficult to remove. In the medical paste kneading injector 1 of the present embodiment, since the grip portion 39 is substantially perpendicular to the back surface 37, the direction of the force for pulling the grip portion 39 is substantially the same as the removal direction of the extrusion stopper 5, Easy to remove.

  In the medical paste kneading and injector 1 of the present embodiment, a grip portion 39 is formed on the back surface of the second fitting recess 33B. Therefore, when removing the stopper 5 for extrusion from the shaft 22, the force which pulls the holding | grip part 39 acts on the 2nd fitting recessed part 33B easily, and is easy to remove.

<Other Embodiment (Modification)>
In addition, this invention is not restricted to said embodiment, In the range which does not deviate from the summary, it can implement in a various aspect. In the said embodiment, although the bone paste was a white paste, it is not restricted to this, Colors other than white may be sufficient.

(1) Although the extrusion stopper 5 in which the grip portion 39 having a specific shape is formed is shown in the above embodiment, the shape of the grip portion 39 can be changed as appropriate.
(2) In the above embodiment, the extrusion stopper 5 in which the first fitting recess 33A and the second fitting recess 33B having a specific shape are formed is shown. However, the shape and number of the fitting recesses may be changed as appropriate. Can do.
(3) The stopper main body portion 35 and the grip portion 39 may be formed integrally or may be joined as separate bodies.

DESCRIPTION OF SYMBOLS 1 ... Medical paste kneading injector 2 ... Cylinder 3 ... Piston 4 ... Fixing member (fixing tool)
4A ... engaging part 5 ... stopper 10 for extrusion ... opening 11 ... cylindrical body (cylindrical body part)
DESCRIPTION OF SYMBOLS 12 ... Flange part 13 ... Nozzle part 14 ... Screw 15 ... Cap 16 ... Curved side 17 ... Diameter reduction part 21 ... Partition 21A ... Engagement part 21B ... Rear end surface 22 ... Shaft 23 ... Stirring part 24 ... Handle part 24A ... Front end Surface 26 ... Through hole 28 ... Front end 29 ... Rear end 30 ... Outer peripheral surface 33A ... First fitting recess (fitting recess)
33B ... 2nd insertion recessed part (insertion recessed part)
35 ... Stopper body part 35A ... Front end face 35B ... Rear end face 37 ... Back face 37A ... Outer edge 37B ... Flat part 39 ... Gripping part 39A ... Binding part 39B ... Wide part 45A ... First sandwiching piece 45B ... Second sandwiching piece 47 ... Connection Support part 48 ... inner surface 63 ... tube 201 ... stopper for extrusion 203 ... finger hook part 205 ... shaft D1 ... axial direction (direction of axis)

Claims (3)

A tubular body,
A cylindrical nozzle part located on the front side of the main body part and having a smaller inner diameter than the main body part,
A cylinder having a reduced diameter portion provided between the main body portion and the nozzle portion and having an inner diameter reduced from the main body portion toward the nozzle portion;
A partition that can slide inside the cylinder in the direction of the axis of the cylinder;
A shaft that is inserted into a through-hole penetrating the center of the partitioning tool, and capable of reciprocating in the direction of the axis that goes in and out of the through-hole and rotating around the axis;
A stirring portion provided at a portion located in the cylinder at the front end of the shaft;
A handle portion fixed to a portion of the rear end of the shaft located outside the cylinder;
An extrusion stopper that functions as a spacer for maintaining a gap between the partition and the handle portion, and is attached to the outer peripheral surface of the shaft in a detachable state;
A medical paste kneading injector comprising:
The extrusion stopper is
A stopper body extending from one end to the other end, a fitting recess fitted to the outer peripheral surface of the shaft, and a direction intersecting the direction from the one end to the other end at one end of the stopper body A flat plate-like gripping part protruding to
The medical paste kneading / injecting device, wherein the extrusion stopper is attached to the shaft so that the gripping portion is located on a rear end side in the direction of the axis.   The gripping portion is formed at a position where the shaft is pushed into the cylinder and the stirring portion contacts the inner surface of the reduced diameter portion in a state where the pushing stopper is fitted to the shaft. The medical paste kneading and injecting device according to claim 1, wherein the gripping portion and the cylinder do not interfere with each other.   The said holding | grip part has a wide part made wide from the coupling | bond part with the said stopper main-body part toward the direction which cross | intersects the direction which goes to the other end from the said one end. Medical paste kneading injector.

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