JP2016036401A - Medical paste kneading injector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a medical paste kneading injector whose handle part can be reliably operated and which can knead and inject medical paste efficiently and quickly.SOLUTION: A medical paste kneading injector 1 includes a cylinder 2, a partition tool 21 capable of sliding inside the cylinder 2 in axial direction D1, a shaft part 22 inserted into a through-hole 26 of the partition tool 21 and capable of reciprocating movement and rotational movement, an agitation part 23 provided at one end 28 of the shaft part 22, and a handle part 24 provided at the other end 29 of the shaft part 22. The handle part 24 includes a body part 31 formed in a circular truncated cone shape such that its diameter gradually increases from a fixed-end 35 side, which faces the one end side of the shaft part 22, to a free-end 36 side on the opposite side.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a medical paste kneading and injector that kneads and injects a medical paste.

  In the medical field or the like, a medical paste kneading and injection device for kneading and injecting a medical paste (for example, calcium phosphate bone paste or the like) has been put into practical use (see Patent Documents 1 and 2).

  The medical paste kneading and injector disclosed in Patent Documents 1 and 2 includes a cylinder having a nozzle portion, a partition that can slide in the cylinder in the axial direction, and a reciprocating motion and rotation inserted through the through hole of the partition. A shaft portion capable of movement, a handle portion provided at an end portion of the shaft portion, and the like are provided. In this medical paste kneader / injector, two elastic engaging claws are provided at the end of the shaft portion. Further, the handle portion is formed in a relatively thin disk shape, and a through hole having a stepped portion that engages with the two engaging claws of the shaft portion is formed in the center portion thereof. Then, by pushing the shaft portion from below into the through hole of the handle portion, the two engaging claws are elastically deformed, and by further pushing the shaft portion, the two engaging claws are stepped portions. Engage with. As a result, the handle portion and the shaft portion are integrated, and the rotation and reciprocation of the shaft portion is performed by operating the handle portion. Moreover, the stirring part is provided in the part located in a cylinder in a shaft part. In the cylinder, the medical paste is kneaded by rotating or reciprocating the stirring portion together with the shaft portion.

JP 2008-113903 A JP 2010-178872 A

  However, in the conventional medical paste kneading and injector, the handle portion attached to the shaft portion has a relatively thin disk shape and is difficult to grasp. For this reason, it was difficult to reciprocate the shaft portion during paste kneading. Furthermore, in the medical paste kneading and injector, a large force is required when pulling the shaft portion through the partition in the cylinder. In this case, the engaging claw of the shaft portion may be disengaged from the stepped portion of the handle portion. When the engaging claw of the shaft portion is disengaged, the shaft portion cannot be operated and the paste cannot be kneaded.

  In Patent Document 1, a rod-shaped handle portion is disclosed as another embodiment. However, the rod-shaped handle portion has a problem that the size becomes too large and the storage and handling become complicated.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a medical paste kneading capable of reliably operating the handle portion and efficiently and quickly kneading and injecting the medical paste. It is to provide an injector.

  And as means (means 1) for solving the above-mentioned problems, a cylinder having an opening at one end and a nozzle part at the other end, and a partitioning tool capable of sliding inside the cylinder in the axial direction of the cylinder, A shaft portion that is inserted into a through-hole penetrating the center of the partitioning tool and capable of reciprocating in and out of the through-hole in the axial direction and rotating around the axis, and one end of the shaft portion. A medical paste kneading and injection device comprising a stirring portion provided in a portion located in the cylinder and a handle portion fixed to the other end of the shaft portion and located outside the cylinder. The handle portion has a main body portion that is formed in a frustum shape so that the diameter increases from a fixed end side facing one end side of the shaft portion toward a free end side opposite thereto. For medical use There are paste kneading injector.

  Therefore, according to the invention described in the means 1, the main body portion of the handle portion is formed in a frustum shape so that the diameter increases from the fixed end side toward the free end side on the opposite side. If it does in this way, when pulling a handle part at the time of kneading of medical paste, a finger will certainly be caught on the outer peripheral surface of a main part. For this reason, a handle part can be operated, without sliding a finger | toe, and medical paste can be knead | mixed reliably. Furthermore, since the main body is a frustum shape and has a simple shape, the operator can easily hold the outer peripheral surface of the main body with a plurality of fingers without improper holding, The handle portion can be reliably operated.

  The main body may be formed in a truncated pyramid shape or a truncated cone shape. When the main body part is formed in a truncated cone shape, the outer peripheral surface of the main body part fits comfortably on the fingertips of the operator, so the operation of rotating the shaft part can be easily performed in addition to the operation of reciprocating the shaft part, The operability of the handle portion can be further improved. Moreover, when making a main-body part into a truncated pyramid shape, it is preferable to form in polygonal shape more than an octagon, for example in the cross sectional view which cross | intersects an axial direction. In this way, the main body portion can be made close to a truncated cone, so that the operability of the handle portion can be improved.

  The “frustum shape” in the present invention broadly refers to a shape that is formed so that the diameter increases from the fixed end side toward the free end side. For example, the outer periphery is formed so that the diameter increases stepwise. Including those having a step of about several millimeters on the surface.

  The outer peripheral surface of the main body in a cross-sectional view along the axial direction may have a linear taper surface that is not curved. In addition, the outer peripheral surface of the main body portion in a cross-sectional view along the axial direction may have a tapered surface that is curved in a concave shape, or may have a tapered surface that is curved in a convex shape. Even when the outer peripheral surface of the main body is formed in this way, the finger is caught on the outer peripheral surface of the main body when the handle is pulled, so that the medical paste can be reliably kneaded without sliding the finger.

  The outer diameter on the free end side of the main body is not particularly limited, but for example, it is preferably 5 mm or more larger than the outer diameter on the fixed end side. If it does in this way, the inclination angle of the outer peripheral surface of a main-body part can fully be ensured, and when pulling a handle part, a finger can be reliably hooked on the outer peripheral surface of a main-body part.

  Although the dimension of the axial direction in a main-body part is not specifically limited, For example, it is preferable that it is 0.5 to 1.5 times the outer diameter of the free end side in a main-body part. Moreover, the outer diameter of the free end side in the main body is not particularly limited, but for example, it is preferably 0.8 times or more and 1.5 times or less the outer diameter of the portion of the cylinder housing the partitioning tool. In this way, the handle portion can be formed compactly, and the handle portion can be securely mounted together with parts such as the cylinder and the shaft portion without unnecessarily increasing the size of the case for housing the medical paste kneading and injector. Can be stored in a case.

  A plurality of convex portions or a plurality of concave portions may be formed on the outer peripheral surface of the main body portion. In this case, since the convex part and the concave part of the outer peripheral surface are non-slip, when the shaft part is reciprocated or rotated, the finger is less likely to slip and the operability of the handle part can be further improved.

  Specifically, a plurality of protrusions may be formed over the entire periphery of the outer peripheral surface of the main body. The plurality of protrusions may have a diameter of 1 mm to 5 mm and a height of 0.5 mm to 5 mm, and the plurality of protrusions may be arranged with an interval of 3 mm to 10 mm. As the plurality of protrusions, in addition to the protrusions, for example, a protrusion may be provided in a lattice shape, but in this case, there is a region where the finger does not contact at the intersection (corner) of the protrusion, A sufficient fit cannot be obtained. On the other hand, when a plurality of relatively small protrusions having a diameter of 1 mm or more and 5 mm or less and a height of 0.5 mm or more and 5 mm or less are arranged at intervals of 3 mm or more and 10 mm or less, Since the protrusion fits securely, the operability of the handle portion can be further improved.

  The handle portion includes a slide coupling portion having a guide groove that opens in at least an end surface and an outer peripheral surface of the main body portion on the fixed end side and extends in an intersecting direction intersecting the axial direction of the shaft portion. The handle part may be detachably fixed to the shaft part by sliding the other end of the shaft part along. At the time of kneading or injecting the medical paste, the handle portion is operated to rotate the shaft portion or linearly move in the axial direction. Since the guide groove of the present invention is provided so as to extend in a direction different from the rotation direction or the axial direction of the shaft portion (cross direction of the axial direction), the direction along the guide groove when kneading or injecting the medical paste The handle is difficult to come off from the shaft. Further, after kneading the medical paste, the handle portion can be easily detached from the shaft portion by sliding the other end of the shaft portion along the intersecting direction in which the guide groove extends.

  More preferably, the guide groove is provided so as to extend linearly in a direction orthogonal to the axial direction. In this case, since the guide groove is provided in a direction different from the rotation direction and the axial direction of the shaft portion, the handle portion is less likely to be detached from the shaft portion when kneading or injecting the medical paste. On the other hand, since the guide groove is linear, the attaching / detaching operation can be performed relatively easily, and the guide groove itself can be formed relatively easily.

  The guide groove may be provided with a positioning projection for positioning and fixing the shaft portion at the center position of the handle portion. In addition, the other end side of the shaft portion is provided with a constricted portion that has a hollow portion and can be bent by contacting the positioning protrusion when the shaft portion is slid along the intersecting direction in which the guide groove extends. May be. Thus, by providing the positioning protrusion, the shaft portion can be reliably fixed at the center position of the handle portion. In the present invention, the center position of the handle portion is a position through which the axis of the handle portion passes. In a state where the handle portion is fixed to the shaft portion, the axis line at the center position of the handle portion matches the axis line of the shaft portion. Further, by providing the constricted portion on the other end side of the shaft portion, the other end of the shaft portion can be reliably fitted into the guide groove. Further, the constricted portion has a hollow portion and is given flexibility. In this case, if the shaft is slid along the intersecting direction of the guide groove and a certain amount of force is applied when the constricted part comes into contact with the positioning protrusion, the constricted part bends toward the cavity, thereby overcoming the positioning protrusion. Thus, the shaft portion can be smoothly moved to the center position of the handle portion.

  The constricted portion has a pair of guide wall surfaces that are in surface contact with the inner surface of the guide groove, and a hollow portion may be formed between the pair of guide wall surfaces. In this manner, the other end of the shaft portion can be reliably guided along the guide groove while the guide wall surface of the constricted portion is in surface contact, and the guide wall surface is reliably bent by contacting the positioning protrusion. be able to. In addition, when the other end of the shaft portion is positioned and fixed at the center position of the handle portion, the pair of guide wall surfaces in the constricted portion are in surface contact with the inner surface of the guide groove, so that the force in the rotation direction of the handle portion is applied to the shaft portion. Can be transmitted reliably.

  The constricted portion is formed in a prismatic shape having a pair of guide wall surfaces forming a flat surface and a pair of wall surfaces provided in a direction perpendicular to the guide wall surface and through which the hollow portion is formed, and the hollow portion is formed through the hollow portion. The width of the wall surface and the width of the guide wall surface may be different. Specifically, the width of the wall surface through which the hollow portion is formed may be formed corresponding to the width of the guide groove, and may be narrower than the width of the guide wall surface. If it does in this way, it will be avoided beforehand that a narrow part will be fitted in an incorrect direction to a guide groove. As a result, the guide wall surface of the constricted portion can reliably contact the positioning protrusion and bend the guide wall surface.

  The corner part of the other end part of the shaft part accommodated in the guide groove may be chamfered. This makes it difficult for the corner of the other end to be caught in the guide groove, and the sliding resistance when moving in the guide groove is reduced, so the other end of the shaft portion can be easily fitted into the guide groove. Can do.

  The material for forming the main body portion of the handle portion is not particularly limited, but is preferably made of a resin molded using a resin material. When the main body is formed by resin molding, the handle becomes lighter than when the main body is formed of a metal material, so that the operability of the handle can be improved.

  A hollow portion is formed in the end surface on the free end side of the main body portion, and the pressed portion is formed in the central portion of the end surface on the free end side so as to have the same protruding amount as the outer peripheral portion of the end surface on the free end side. May be provided. In this way, by forming the hollowed recess in the main body, it is possible to reliably prevent sink marks during resin molding in the main body. In addition, when the medical paste is injected, by pressing the outer peripheral portion and the pressed portion at the center portion simultaneously on the end surface on the free end side of the main body portion, the shaft portion is placed on the other end side of the cylinder in which the nozzle portion is formed. Can be pushed in easily. For this reason, the operativity of a handle part can be improved more.

  The shaft portion may be colored with a color other than white. An example of a medical paste is white bone paste. When the shaft portion is colored with a color other than white, it is possible to easily confirm the position of the shaft portion and the stirring portion at the end thereof when the bone paste is kneaded.

  The handle portion may be formed using the same resin material as the shaft portion. As this resin material, for example, a polyolefin resin such as polycarbonate, polyethylene, or polypropylene can be used. In this case, the handle portion can be manufactured at low cost and with sufficient strength.

Sectional drawing which shows the structure of the medical paste kneading injector in this Embodiment. The side view which shows the medical paste kneading injection device in this Embodiment. The perspective view which shows the constriction part of a shaft part, and a handle part. The bottom view of the handle | steering-wheel part seen from the fixed end side of the main-body part. Explanatory drawing which shows the cross section of the constriction part of a shaft part, and a handle | steering-wheel part. The side view which shows the constriction part of a shaft part, and a handle | steering-wheel part. The top view of the handle part seen from the free end side of the main-body part. The perspective view which shows the stopper for extrusion. Sectional drawing which shows the medical paste kneading injection device at the time of paste injection. The side view which shows the handle | steering-wheel part of another embodiment which has a taper surface from which an inclination angle differs in the outer peripheral surface of a main-body part. The side view which shows the handle | steering-wheel part of another embodiment which has a plane parallel to an axial direction and a taper surface in the outer peripheral surface of a main-body part. The side view which shows the handle | steering-wheel part of another embodiment which has a flange part in the outer peripheral surface of a main-body part. The side view which shows the handle | steering-wheel part of another embodiment which has a taper surface curved in the concave shape in the outer peripheral surface of a main-body part. The side view which shows the handle | steering-wheel part of another embodiment which has the taper surface curved convexly in the outer peripheral surface of a main-body part. The bottom view which shows the handle | steering-wheel part of another embodiment which has a main-body part formed in the shape of an elliptic frustum. The bottom view which shows the handle | steering-wheel part of another embodiment which has a main-body part formed in the shape of an octagonal truncated pyramid.

  Hereinafter, an embodiment in which the present invention is embodied in a medical paste kneading injector will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view showing a schematic configuration of a medical paste kneading / injecting device according to the present embodiment, and FIG. 2 is a side view showing the medical paste kneading / injecting device.

  As shown in FIGS. 1 and 2, the medical paste kneading and injector 1 according to 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 a white paste.

  The cylinder 2 has an opening 10 at one end, a cylindrical body 11 for holding bone paste therein, a flange portion 12 provided at an opening end serving as one end of the cylindrical body 11, and the other end of the cylindrical body 11. The nozzle part 13 provided is provided. 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, 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 part 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 partition 21 arranged on the opening end 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 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 of the cylinder 2. A through hole 26 is formed in the partitioning tool 21 so as to penetrate the center, and the shaft portion 22 is inserted into the through hole 26.

  The shaft portion 22 is a round bar made of a synthetic resin colored with a color other than white (for example, green) different from the bone paste, and a reciprocating motion in the axial direction D1 entering and exiting the through hole 26 of the partitioning tool 21 and the axis line. And a rotational movement in the circumferential direction D2 with respect to the center. The shaft portion 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 one end 28 of the shaft portion 22 and located inside the cylinder 2. A handle portion 24 is fixed to the other end 29 of the shaft portion 22 and a portion located outside the cylinder 2.

  As shown in FIGS. 3 to 6, the handle portion 24 includes a resin main body portion 31 and a slide coupling portion 33 having a guide groove 32 provided in the main body portion 31. The main body 31 is formed using the same resin material as the shaft 22, specifically, polycarbonate. The main body portion 31 of the present embodiment is formed in a truncated cone shape so that the diameter increases from the fixed end 35 side facing the one end 28 side of the shaft portion 22 toward the opposite free end 36 side. The outer diameter on the free end 36 side of the main body 31 is 5 mm or more larger than the outer diameter on the fixed end 35 side, and about 1.0 times the outer diameter of the cylindrical body 11 housing the partition 21 in the cylinder 2. It has become. Specifically, the outer diameter on the free end 36 side of the main body 31 is about 30 mm, and the outer diameter on the fixed end 35 side is about 20 mm. Moreover, the dimension of the axial direction in the main-body part 31 is about 30 mm substantially equal to the outer diameter by the side of the free end 36 in the main-body part 31.

  The guide groove 32 of the slide coupling portion 33 is provided so as to extend in the intersecting direction D3 (in the present embodiment, the orthogonal direction perpendicular to the axial direction D1) intersecting the axial direction of the shaft portion 22 in the main body portion 31. The main body 31 is open at the end surface 37 and the outer peripheral surface 38 on the fixed end 35 side. The handle portion 24 is detachably fixed to the shaft portion 22 by sliding the other end 29 of the shaft portion 22 along the intersecting direction D3 in which the guide groove 32 extends.

  Specifically, the guide groove 32 is formed up to the center position of the main body 31 (position where the axis passes). The guide groove 32 has a first groove portion 41 having a narrow width and a second groove portion 42 having a width wider than the first groove portion 41, and a step 43 is formed at the boundary between the first groove portion 41 and the second groove portion 42. Yes. The second groove portion 42 has a width substantially equal to the diameter (width) of the shaft portion 22, and opens to the outer peripheral surface 38. Further, the first groove portion 41 opens in the end surface 37 on the fixed end 35 side in addition to the outer peripheral surface 38. The first groove portion 41 is formed so as to extend linearly with the same width toward the center of the main body portion 31, and the second groove portion 42 also extends linearly with the same width toward the center of the main body portion 31. Is formed. A positioning projection 45 for positioning and fixing the shaft portion 22 at the center position of the handle portion 24 is provided on the inner surface 54 of the first groove portion 41 of the guide groove 32. The positioning protrusion 45 is an elongated ridge provided so as to extend in a direction orthogonal to the sliding direction (crossing direction D3) of the shaft portion 22, and its height is about 0.2 mm.

  As shown in FIGS. 3, 5, and 6, when the shaft portion 22 is slid along the intersecting direction D <b> 3 in which the hollow portion 51 is provided on the other end 29 side of the shaft portion 22 and the guide groove 32 extends. A constricted portion 52 that can be bent in contact with the positioning protrusion 45 is provided. In the shaft portion 22, the constricted portion 52 is fitted into the first groove portion 41 in the guide groove 32, and a portion on the tip side of the constricted portion 52 is fitted into the second groove portion 42.

  The constricted portion 52 has a pair of guide wall surfaces 55 in surface contact with the inner surface 54 of the first groove portion 41 of the guide groove 32 and a pair of wall surfaces 56 provided in a direction perpendicular to the guide wall surface 55. It is formed in a column shape. The cavity 51 is provided so as to penetrate a pair of wall surfaces 56 provided in a direction perpendicular to the guide wall surface 55 forming a flat surface. That is, in the constricted portion 52, the hollow portion 51 is formed between the pair of guide wall surfaces 55.

  In the present embodiment, in the constricted portion 52, the width of the wall surface 56 through which the cavity portion 51 is formed is different from the width of the guide wall surface 55. Specifically, the width of the wall surface 56 through which the cavity portion 51 is formed is formed corresponding to the width of the first groove portion 41 of the guide groove 32 and is narrower than the width of the guide wall surface 55. If it does in this way, it will be avoided that the direction of the constriction part 52 is made to fit into the 1st groove part 41 of the guide groove 32 accidentally. Then, by aligning the direction of the constricted portion 52 so that the hollow portion 51 can be seen from the opening of the guide groove 32 and aligning the position so that the guide wall surface 55 of the constricted portion 52 contacts the inner surface 54 of the guide groove 32, the shaft portion The other end 29 of 22 is fitted in the guide groove 32. Further, in the shaft portion 22, the corner portion 58 of the other end portion 57 accommodated in the guide groove 32 is chamfered.

  In the present embodiment, when the other end 29 of the shaft portion 22 is slid along the intersecting direction D <b> 3 in which the guide groove 32 extends, each guide wall surface 55 of the constricted portion 52 contacts the positioning protrusion 45. At this time, when a certain amount of force is applied, each guide wall surface 55 of the constricted portion 52 bends toward the hollow portion 51, gets over the positioning protrusion 45, and the other end 29 of the shaft portion 22 moves toward the center side of the handle portion 24. Is possible. Further, when the other end 29 of the shaft portion 22 moves to the center position of the handle portion 24, the contact with the positioning projection 45 is released, and each guide wall surface 55 of the constricted portion 52 is bent straight from the original state. Return to. As a result, the other end 29 of the shaft portion 22 is positioned and fixed at the center position of the handle portion 24.

  Thus, in the state in which the other end 29 of the shaft portion 22 is fixed to the handle portion 24, the pair of guide wall surfaces 55 in the constricted portion 52 are in surface contact with the inner surface 54 of the guide groove 32. A force is transmitted to the shaft portion 22. Further, the end surface of the other end portion 57 of the shaft portion 22 abuts against the inner surface of the guide groove 32 (second groove portion 42), so that the force when pushing the handle portion 24 is transmitted to the shaft portion 22. Further, the end portion 59 of the constricted portion 52 abuts on the step 43 of the guide groove 32 in the shaft portion 22, so that the force when pulling the handle portion 24 is transmitted to the shaft portion 22.

  In the handle portion 24, the outer peripheral surface 38 of the main body portion 31 has a tapered surface inclined with respect to the axial direction of the shaft portion 22, and a plurality of protrusions 61 are formed over the entire periphery. The plurality of protrusions 61 have a diameter of about 2 mm and a height of about 1 mm, and the plurality of protrusions 61 are arranged with an interval of about 5 mm.

  Further, as shown in FIGS. 5 and 7, the end surface 39 on the free end 36 side of the main body 31 is formed with a lightening recess 63 for preventing sink marks during resin molding. Further, a pressed portion 65 is provided at the center portion of the end surface 39 on the free end 36 side so as to have the same protruding amount as the outer peripheral portion 64 of the end surface 39. A sufficient pressing force can be obtained by simultaneously pressing the outer peripheral portion 64 and the pressed portion 65 on the end surface 39 on the free end 36 side of the main body portion 31.

  As shown in FIG. 1, the extrusion stopper 5 is a member that functions as a spacer that is attached to and detached from the outer peripheral surface 68 of the shaft portion 22 so as to maintain a distance between the partition 21 and the handle portion 24. As shown in FIG. 8, the extrusion stopper 5 protrudes from a stopper main body 71 in which a fitting recess 70 to be fitted to the outer peripheral surface 68 of the shaft portion 22 is formed, and an outer surface 73 of the stopper main body 71. And a finger-hanging portion 72. The extrusion stopper 5 is formed using the same resin material as that of the shaft portion 22 and the handle portion 24, specifically, polycarbonate.

  Two pairs of clamping pieces 74 that clamp the outer peripheral surface 68 of the shaft portion 22 are formed at both ends of the stopper main body 71 of the extrusion stopper 5 that are separated in the axial direction. In the stopper main body 71, the tip 75 of each clamping piece 74 located at the corners at both ends thereof is chamfered. The inner surface 76 of each clamping piece 74 is formed in an arc shape curved with the same curvature as the outer peripheral surface 68 of the shaft portion 22, and the arc angle is a concave surface larger than a semicircle. Further, in the stopper main body 71, the inner surface 78 of the connection support portion 77 located on the center side in the axial direction with respect to each sandwiching piece 74 has a semicircular arc-shaped concave surface curved with the same curvature as the outer peripheral surface 68 of the shaft portion 22. It has become. In the extrusion stopper 5 of the present embodiment, the fitting recess 70 is constituted by the inner surface 76 of the sandwiching piece 74 and the inner surface 78 of the connection support portion 77.

  The finger hook portion 72 is a rib formed so as to extend along the axial direction. On the outer surface 73 side of the extrusion stopper 5, a flat portion 80 having a flat surface 79 serving as a character printing space is provided, and the finger hook portion 72 is formed by projecting both end edges of the flat portion 80 in the width direction. ing. The extrusion stopper 5 mounted on the outer peripheral surface 68 of the shaft portion 22 pushes the partitioning tool 21 together with the shaft portion 22 into the cylinder 2 to discharge the medical paste from the cylinder 2 (see FIG. 9).

  Next, a method of using 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, and an operator such as a doctor or a nurse puts the cap 15 screwed on the nozzle portion 13 of the cylindrical body 11 of the cylinder 2. Remove. 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 push-out stopper 5 from the outer peripheral surface 68 of the shaft portion 22 by placing a finger on and pulling the finger-hanging portion 72 of the push-out stopper 5.

  Thereafter, the operator sandwiches the outer peripheral surface 38 of the handle portion 24 with a plurality of fingers and operates the handle portion 24 to thereby rotate the piston 3 in the circumferential direction D2 around the axis of the cylinder 2 and the axis. The reciprocating motion of the piston 3 in the direction D1 is performed in combination. At this time, the shaft portion 22 enters and exits the through hole 26 of the partition member 21, and the powder paste raw material and the liquid are kneaded by the stirring portion 23 provided on the one end 28 side of the shaft portion 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. Further, even when the handle portion 24 is operated to perform the rotational motion and the reciprocating motion of the piston 3 in combination, the guide groove 32 extends so as to extend in the intersecting direction D3 different from the axial direction D1 and the rotational direction D2. Since it is formed, the handle portion 24 does not come off the shaft portion 22.

  After the kneading of the bone paste is completed, the operator pulls back the shaft portion 22 of the piston 3 fully upward, and in this state, attaches the extrusion stopper 5 to the outer peripheral surface 68 of the shaft portion 22 again. Next, the operator removes the fixing member 4 from the flange portion 12 and the divider 21. Further, as shown in FIG. 9, the operator pushes the outer peripheral portion 64 and the pressed portion 65 on the end surface 39 on the free end 36 side of the handle portion 24 after changing the cap 15 of the nozzle portion 13 to the tube 18. As a result, the piston 3 is pushed into the cylinder 2. At this time, the partition 21 moves together with the shaft portion 22 in the cylinder 2 in the axial direction D1. Then, the bone paste in the cylinder 2 is squeezed to the outside as the partition member 21 moves, and is injected into the affected part through the tube 18 attached to the nozzle part 13.

  Further, in the medical paste kneading and injector 1 of the present embodiment, the handle portion 24 is provided so as to be detachable from the shaft portion 22. For this reason, it is also possible to remove the handle portion 24 from the shaft portion 22 after the bone paste is kneaded and to inject the bone paste into the affected area using a mechanical injection gun (not shown).

  Therefore, according to the present embodiment, the following effects can be obtained.

  (1) In the medical paste kneading and injector 1 of the present embodiment, the main body 31 of the handle portion 24 has a truncated cone so that the diameter increases from the fixed end 35 side toward the free end 36 side opposite thereto. Therefore, the outer peripheral surface 38 is an inclined tapered surface. Therefore, when the handle portion 24 is pulled when the bone paste is kneaded, the finger is reliably caught on the outer peripheral surface 38 of the main body portion 31. For this reason, the handle | steering-wheel part 24 can be operated, without sliding a finger | toe, and a bone paste can be knead | mixed reliably. Furthermore, since the main body 31 has a truncated cone shape and a simple shape, the operator can easily hold the outer peripheral surface 38 of the main body 31 with a plurality of fingers without improper holding. And the handle portion 24 can be reliably operated. Moreover, the outer peripheral surface 38 fits an operator's fingertip without a sense of incongruity by forming the main-body part 31 of the handle part 24 in a truncated cone shape. For this reason, in addition to the operation of reciprocating the shaft portion 22 using the handle portion 24, the operation of rotating the shaft portion 22 can be easily performed, and the operability of the handle portion 24 can be further improved. Therefore, when the medical paste kneading and injector 1 of the present embodiment is used, the bone paste can be reliably kneaded in a short time, and a more uniform bone paste can be supplied to the affected area.

  (2) In the medical paste kneading and injector 1 of the present embodiment, a plurality of protrusions 61 are formed on the outer peripheral surface 38 of the main body 31 in the handle portion 24 over the entire periphery. These protrusions 61 have a diameter of about 2 mm and a height of about 1 mm, and the protrusions 61 are arranged with an interval of about 5 mm. Thus, when providing the some protrusion 61 in the outer peripheral surface 38 of the main-body part 31, since each protrusion 61 fits a worker's finger tip reliably, a finger becomes difficult to slip and the operativity of the handle | steering-wheel part 24 is improved more. Can do.

  (3) In the medical paste kneading and injector 1 of the present embodiment, the guide groove 32 for fixing the handle portion 24 to the shaft portion 22 is different from the axial direction D1 and the rotational direction D2 of the shaft portion 22 (axial direction). It is provided so as to extend linearly in the intersecting direction D3) intersecting D1. For this reason, it is difficult for force to be applied in the direction along the guide groove 32 during kneading or injection of the bone paste, and the handle portion 24 is unlikely to come off the shaft portion 22. In addition, after kneading the medical paste, the handle portion 24 can be easily detached from the shaft portion 22 by sliding the other end 29 of the shaft portion 22 along the intersecting direction D3 in which the guide groove 32 extends. In particular, in the present embodiment, since the guide groove 32 is linear, the attaching / detaching operation can be performed relatively easily, and the guide groove 32 itself can be formed relatively easily.

  (4) In the medical paste kneading and injector 1 of the present embodiment, the guide groove 32 is provided with a positioning projection 45 for positioning and fixing the shaft portion 22 at the center position of the handle portion 24. Further, a constricted portion 52 having a hollow portion 51 is provided on the other end 29 side of the shaft portion 22. Thus, by providing the positioning protrusion 45 in the guide groove 32, the shaft portion 22 can be reliably fixed at the center position of the handle portion 24. Further, by providing the constricted portion 52 on the other end 29 side of the shaft portion 22, the other end 29 of the shaft portion 22 can be reliably fitted into the guide groove 32. Further, the constricted part 52 has a hollow part 51 and is given flexibility. In this case, when the shaft portion 22 is slid along the intersecting direction D3 in which the guide groove 32 extends and a certain amount of force is applied when the constricted portion 52 comes into contact with the positioning protrusion 45, the constricted portion 52 bends to cause the positioning protrusion 45 to bend. Thus, the shaft portion 22 can be smoothly moved to the center position of the handle portion 24.

  (5) In the medical paste kneading and injector 1 of the present embodiment, the constricted portion 52 of the shaft portion 22 has a pair of guide wall surfaces 55 that are in surface contact with the inner surface 54 of the first groove portion 41 of the guide groove 32. A cavity 51 is formed between the pair of guide wall surfaces 55. In this way, the other end 29 of the shaft portion 22 can be reliably guided along the guide groove 32 in a state where the guide wall surface 55 of the constricted portion 52 is in surface contact, and the guide wall surface 55 is formed on the positioning protrusion 45. The guide wall surface 55 can be reliably bent by contact. Further, in a state where the other end 29 of the shaft portion 22 is positioned and fixed at the center position of the handle portion 24, the pair of guide wall surfaces 55 in the constricted portion 52 are in surface contact with the inner surface 54 of the guide groove 32. The force in the rotational direction can be reliably transmitted to the shaft portion 22.

  (6) In the medical paste kneading and injector 1 of the present embodiment, the constricted portion 52 of the shaft portion 22 is provided in a direction perpendicular to the pair of guide wall surfaces 55 and the guide wall surface 55 forming a flat surface. It is formed in a prismatic shape having a pair of wall surfaces 56 through which 51 penetrates. The width of the wall surface 56 through which the cavity portion 51 is formed is formed corresponding to the width of the first groove portion 41 of the guide groove 32 and is narrower than the width of the guide wall surface 55. If it does in this way, it will be avoided beforehand that the narrow part 52 will be fitted to the guide groove 32 in the wrong direction. As a result, the guide wall surface 55 of the constricted portion 52 can reliably contact the positioning protrusion 45 and bend the guide wall surface 55.

  (7) In the medical paste kneading and injector 1 of the present embodiment, the corner portion 58 of the other end portion 57 accommodated in the guide groove 32 is chamfered in the shaft portion 22. In this way, the corner portion 58 of the other end portion 57 is less likely to be caught by the guide groove 32, and the sliding resistance when moving in the guide groove 32 is reduced. 32 (second groove portion 42) can be easily fitted. Further, since the corner portion 58 of the other end portion 57 of the shaft portion 22 is chamfered, the shaft portion 22 can be easily inserted into the through hole 26 of the partitioning tool 21, and a sealing material or the like in the partitioning tool 21 can be used. Damage can be avoided.

  (8) In the medical paste kneading / injecting device 1 of the present embodiment, since the thinning recess 63 is formed on the end surface 39 on the free end 36 side of the main body 31 of the handle portion 24, the resin molding in the main body 31 is performed. Time sinks can be reliably prevented. Further, in the main body portion 31 of the handle portion 24, a pressed portion 65 is provided at the center portion of the end surface 39 on the free end 36 side so as to have the same protruding amount as the outer peripheral portion 64. Therefore, the shaft portion 22 can be easily pushed into the cylinder 2 by pushing the outer peripheral portion 64 and the pressed portion 65 of the main body portion 31 when kneading or injecting the medical paste, and the handle portion 24 can be operated. The sex can be increased.

  (9) In the medical paste kneading and injector 1 of the present embodiment, the axial dimension of the main body 31 of the handle portion 24 is substantially equal to the outer diameter of the main body 31 on the free end 36 side. Further, the outer diameter of the main body portion 31 on the free end 36 side is substantially equal to the outer diameter of the cylindrical body 11 of the cylinder 2 that accommodates the partitioning tool 21 and is smaller than the outer diameter of the flange portion 12. Thus, by forming the handle portion 24 in a compact manner, the handle portion 24 together with parts such as the cylinder 2 and the shaft portion 22 can be obtained without unnecessarily increasing the size of the case for housing the medical paste kneading and injector 1. Can be securely stored in the case. The medical paste kneading / injecting device 1 is used after being sterilized, but by forming the handle portion 24 compactly as in the present embodiment, the sterilization bag together with components such as the cylinder 2 and the shaft portion 22 is used. It can be stored securely and stored.

  In addition, you may change embodiment of this invention as follows.

  In the medical paste kneading and injector 1 of the above embodiment, the main body 31 of the handle portion 24 is formed in a truncated cone shape, and the inclination angle of the outer peripheral surface 38 inclined in a tapered shape in the main body 31 is constant. However, the present invention is not limited to this. Like the handle portions 24A to 24E shown in FIGS. 10 to 14, the shapes of the outer peripheral surfaces 38A to 38E in the main body portions 31A to 31E may be changed. In the main body 31A shown in FIG. 10, the inclination angle on the fixed end 35 side is gentle on the outer peripheral surface 38A, the inclination angle is changed at the central portion in the axial direction D1, and the inclination angle on the free end 36 side is large. It has become. In the main body 31A of FIG. 10, the inclination angle is changed in two stages, but the outer peripheral surface may be formed so that the inclination angle is changed in three or more stages. Moreover, it is not necessary to incline the whole outer peripheral surface, and you may provide the part which does not incline in a part of outer peripheral surface. In the main body 31B shown in FIG. 11, a part on the free end 36 side of the outer peripheral surface 38B is formed in parallel with the axial direction D1, and the other part is a tapered surface inclined. Further, in the main body portion 31C shown in FIG. 12, a flange portion 82 protruding outward is formed on the free end 36 side of the outer peripheral surface 38C. Further, as shown in FIG. 13, the outer peripheral surface 38D of the main body 31D may have a concavely curved tapered surface, and as shown in FIG. 14, the outer peripheral surface 38E of the main body 31E is In addition, it may have a tapered surface that is curved in a convex shape.

  In the medical paste kneading and injector 1 of the above embodiment, the main body portions 31 and 31A to 31E of the handle portions 24 and 24A to 24E are formed in a truncated cone shape, but the shape of the main body portions 31 and 31A to 31E May be appropriately changed as long as the shape is a frustum. Specifically, the main body 31F may be formed in an elliptical frustum shape like a handle portion 24F shown in FIG. Furthermore, as in the handle portion 24G shown in FIG. 16, the main body portion 31G may be formed in an octagonal truncated pyramid shape, for example. 15 and 16 are bottom views of the handle portions 24F and 24G viewed from the fixed end 35 side having a small diameter in the main body portions 31F and 31G. As shown in FIGS. 15 and 16, each main body 31F, 31G is formed with a guide groove 32 for fixing the other end 29 of the shaft 22 as in the above embodiment.

  Next, in addition to the technical ideas described in the claims, the technical ideas grasped by the embodiments described above are listed below.

  (1) A medical paste kneading and injecting device characterized in that, in the means 1, a plurality of protrusions are formed on the outer peripheral surface of the handle portion.

  (2) The medical paste kneading / injecting device according to (1), wherein a plurality of protrusions are formed on the outer peripheral surface of the handle portion over the entire periphery.

  (3) In the technical idea (2), the plurality of protrusions are disposed with an interval of 3 mm or more and 10 mm or less.

  (4) In any one of the technical ideas (1) to (3), the plurality of protrusions have a diameter of 1 mm to 5 mm and a height of 0.5 mm to 5 mm. Kneading injector.

  (5) The medical paste kneading injector according to (1), wherein the outer diameter of the main body portion on the free end side is 5 mm or more larger than the outer diameter of the fixed end side.

  (6) The medical paste kneading characterized in that, in the means 1, the axial dimension of the main body is not less than 0.5 times and not more than 1.5 times the outer diameter on the free end side of the main body. Syringe.

  (7) In the means 1, the outer diameter on the free end side of the main body is 0.8 times or more and 1.5 times or less of the outer diameter of the portion of the cylinder housing the partition. A medical paste kneader and injector.

  (8) The medical paste kneading / injecting device according to the first aspect, wherein the outer peripheral surface of the main body has a tapered surface.

  (9) The medical paste kneading / injecting device characterized in that, in the means 1, the outer peripheral surface of the main body portion in a cross-sectional view along the axial direction has a linear taper surface that is not curved.

  (10) The medical paste kneading / injecting device according to (1), wherein the outer peripheral surface of the main body portion in a cross-sectional view along the axial direction has a tapered surface curved in a concave shape.

  (11) The medical paste kneading / injecting device characterized in that, in the means 1, the outer peripheral surface of the main body portion in a sectional view along the axial direction has a tapered surface curved in a convex shape.

  (12) In the means 1, the handle portion opens at least on the end surface and the outer peripheral surface of the main body portion on the fixed end side, and linearly extends in an intersecting direction orthogonal to the axial direction of the shaft portion. The handle portion is detachably fixed to the shaft portion by sliding the other end of the shaft portion along the intersecting direction in which the guide groove extends. Medical paste kneading injector.

  (13) In the technical idea (12), the guide groove is provided with a positioning projection for positioning and fixing the shaft portion at a center position of the handle portion, and the other end side of the shaft portion. Is provided with a constricted portion that has a hollow portion and can be bent in contact with the positioning protrusion when the shaft portion is slid along the intersecting direction in which the guide groove extends. A pair of guide wall surfaces forming a flat surface and a pair of wall surfaces provided in a direction perpendicular to the guide wall surface and through which the cavity portion is formed, and the cavity portion is formed to penetrate therethrough. Further, the medical paste kneading and injecting device, wherein the width of the wall surface and the width of the guide wall surface are different.

  (14) The medical paste kneading / injecting device according to the technical idea (13), wherein a width of the wall surface through which the hollow portion is formed is formed corresponding to a width of the guide groove.

  (15) The medical paste kneading and injector according to means 1, wherein the shaft portion is colored with a color other than white.

  (16) The medical paste kneading and injector according to means 1, wherein the handle portion is formed using the same resin material as the shaft portion.

DESCRIPTION OF SYMBOLS 1 ... Medical paste kneading injector 2 ... Cylinder 10 ... Opening 13 ... Nozzle part 21 ... Partitioning tool 22 ... Shaft part 23 ... Stirring part 24, 24A-24G ... Handle part 26 ... Through-hole 28 ... One end of a shaft part 29 ... Other end 31, 31A to 31G of shaft portion ... Main body portion 32 ... Guide groove 33 ... Slide coupling portion 35 ... Fixed end 36 ... Free end 37 ... Fixed end side end surface 38, 38A-38G ... Outer peripheral surface 39 ... Free end side 45 ... Positioning projection 51 ... Cavity portion 52 ... Constricted portion 55 ... Guide wall surface 57 ... Other end portion of shaft portion 58 ... Corner portion 61 ... Protrusions as a plurality of convex portions 63 ... Thickening concave portion 64 ... Outer peripheral portion 65 ... Pressed part D1 ... Axial direction D3 ... Crossing direction

Claims (8)

A cylinder having an opening at one end and a nozzle portion at the other end;
A partition that can slide inside the cylinder in the axial direction of the cylinder;
A shaft portion that is inserted into a through-hole penetrating the center of the partitioning tool, and capable of reciprocating in and out of the through-hole in the axial direction and rotating around the axis;
An agitation part provided at a portion of the shaft part located in the cylinder at one end;
A medical paste kneading injector comprising a handle portion fixed to a portion located outside the cylinder at the other end of the shaft portion,
The handle portion is
A medical paste kneading and injecting device comprising a main body portion formed in a frustum shape so that a diameter increases from a fixed end side facing the one end side of the shaft portion toward a free end side opposite thereto.   The medical paste kneading and injecting device according to claim 1, wherein the main body portion is formed in a truncated cone shape.   The medical paste kneading and injecting device according to claim 1, wherein a plurality of convex portions or a plurality of concave portions are formed on the outer peripheral surface of the main body portion. The handle portion is
A slide coupling portion having a guide groove that opens at least at an end surface and an outer peripheral surface of the main body portion on the fixed end side and extends in an intersecting direction intersecting the axial direction of the shaft portion;
4. The handle portion is detachably fixed to the shaft portion by sliding the other end of the shaft portion along the intersecting direction in which the guide groove extends. 2. A medical paste kneading injector according to item 1. The guide groove is provided with a positioning projection for positioning and fixing the shaft portion at the center position of the handle portion,
On the other end side of the shaft portion, there is a constricted portion that has a hollow portion and can be bent by contacting the positioning protrusion when the shaft portion is slid along the intersecting direction in which the guide groove extends. The medical paste kneading / injecting device according to claim 4, wherein the medical paste kneading / injecting device is provided.   The said constricted part has a pair of guide wall surface which is surface-contacted with respect to the inner surface of the said guide groove, The said cavity part is formed between the said pair of guide wall surfaces. Medical paste kneading injector.   The medical paste kneading and injecting device according to any one of claims 4 to 6, wherein a corner portion of the other end portion of the shaft portion accommodated in the guide groove is chamfered. On the end surface on the free end side of the main body portion, a thinning recess is formed,
The pressed portion is provided at the center of the end surface on the free end side so as to have the same protruding amount as the outer peripheral portion of the end surface on the free end side. 2. A medical paste kneading injector according to item 1.

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