JP6445272B2 - Medical paste kneading injector - Google Patents

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 moving, a handle portion provided at an end portion of the shaft portion, an extrusion stopper (a connecting member) for pushing the partitioning tool into the cylinder together with the shaft portion, and the like are provided. The extrusion stopper is attached to the outer peripheral surface of the shaft portion between the partition member and the handle portion in a detachable state. Specifically, the stopper for extrusion uses a resin pipe material having a through hole that fits to the outer peripheral surface of the shaft portion, and cuts one portion of the circumference of the pipe material in the axial direction to have a substantially C-shaped cross section. It is formed to become.

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

JP 2008-113903 A JP 2010-178872 A

  In the medical paste kneading and injector, the extrusion stopper needs to be removed from the outer peripheral surface of the shaft portion when kneading the bone paste. However, since the conventional extrusion stopper has a simple shape in which a part of the pipe material is notched in the axial direction, the outer surface is slippery and has a structure in which it is difficult to apply force at the time of attachment / detachment. Further, the extrusion stopper is relatively firmly fitted in such a manner that the entire axial direction is fitted into the outer peripheral surface of the shaft portion. For this reason, the conventional medical paste kneading injector has a problem that it is difficult to remove the extrusion stopper from the outer peripheral surface of the shaft portion.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a medical paste kneading and injecting device capable of easily attaching and detaching an extrusion stopper to and from an outer peripheral surface of a shaft portion. is there.

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 stirring portion provided in a portion located in the cylinder, a handle portion fixed to a portion located at the other end of the shaft portion and located outside the cylinder, and a distance between the partition member and the handle portion A medical paste kneading and injection device provided with an extrusion stopper that functions as a spacer for holding the shaft and is detachably attached to the outer peripheral surface of the shaft portion. A stopper body loading cavity which is fitted to the outer peripheral surface of the shaft portion is formed and arranged so as to extend along the longitudinal direction of the shaft portion, projecting from the outer surface of the stopper body finger hook and a section, wherein the finger grips when said stopper extrusion shoved the shaft portion in the cylinder in a state attached to the outer peripheral surface of the shaft portion, the tip is separated from the inner peripheral surface of the cylinder projecting so as not to contact the inner circumferential surface of the cylinder Te, and there is a medical paste kneading injector, wherein Rukoto arranged site located at least in the cylinder of the stopper body.

  According to the invention described in Means 1, the stopper recess is formed in the stopper main body, and the stopper for extrusion is mounted by fitting the recess into the outer peripheral surface of the shaft portion. By mounting this pushing stopper, the distance between the partition and the handle portion is maintained. For this reason, it becomes possible by pushing a handle part to push a partition tool into the other end side of a cylinder with a shaft part, and to discharge a medical paste from a cylinder outside. Further, a finger hooking portion projects from the outer surface of the stopper main body, and the pushing stopper can be easily removed from the outer peripheral surface of the shaft portion by hooking the finger on the finger hooking portion and applying a force. As a result, the workability of the medical paste kneading and injector can be improved, and the medical paste kneading work can be performed quickly.

  The finger-hanging portion may have any shape as long as it can hook a finger, but may be a rib formed so as to extend along the axial direction, for example. With such a shape, it is possible to reliably hook a finger on the finger-hanging portion and to apply a force with certainty. Moreover, the extrusion stopper itself can be reinforced as a whole.

  The fitting recess has a first fitting recess formed at a position including at least one axial end in the stopper body, and a second fitting recess formed at a position including at least the other axial end, The first fitting recess and the second fitting recess may be provided apart from each other in the axial direction. Here, when the entire stopper along the axial direction of the shaft portion is fitted to the outer peripheral surface of the shaft portion as in the conventional extrusion stopper, a large force is required when the extrusion stopper is attached or detached. On the other hand, when the stopper for extrusion is configured so as to sandwich the outer peripheral surface of the shaft portion by the first fitting recess and the second fitting recess provided at positions apart from both ends of the stopper body as in the present invention, The stopper for extrusion can be easily attached and detached with an appropriate force.

  The stopper body may have chamfered corners at both ends in the axial direction. If it does in this way, since the corner | angular part of a stopper main body becomes difficult to catch on the end surface of a partition tool, or the end surface of a handle part at the time of attachment / detachment of the stopper for extrusion, attachment / detachment of the stopper for extrusion can be performed easily.

  On the outer surface side of the stopper for extrusion, a flat portion having a flat surface serving as a character printing space is provided, and the finger-hanging portion is formed by projecting both end edges of the flat portion in the width direction perpendicular to the axial direction. May be. If it does in this way, since a finger | toe can be reliably hooked on a finger hook part, attachment / detachment of the stopper for extrusion can be performed easily. In addition, in the printing space of the flat portion, for example, a message such as an appropriate usage method of the stopper for extrusion and information such as a product name can be written. Furthermore, since the printing surface is a flat surface, printed messages and information can be easily read, and an effect of facilitating the printing operation can be expected. Moreover, since it has a flat surface, the stopper for extrusion can also be mounted stably by, for example, turning the flat surface downward after removing the stopper for extrusion.

  The shape of the handle portion is not particularly limited, but for example, the handle portion is formed in a truncated cone shape so that the diameter increases from the fixed end side facing one end of the shaft portion toward the free end side on the opposite side. May be. In this case, the extrusion stoppers may be mounted in a state where the end surfaces located at both ends of the extrusion stopper are in contact with the end surface of the fixed end of the handle portion and the end surface of the partitioning tool. Thus, by making the handle portion a truncated cone, the operability can be improved, and the medical paste can be kneaded efficiently. In addition, when the extrusion stopper is installed, the end surface of the extrusion stopper comes into contact with the end surface of the fixed end of the handle portion and the end surface of the partition member. Can be pushed in securely.

  As the stopper for extrusion, any material can be used as long as it has a certain degree of strength. For example, it may be formed using the same resin material as that of the shaft portion. As this resin material, a polyolefin resin such as polycarbonate, polyethylene, or polypropylene can be used. In this case, the extrusion stopper 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 which has arrange | positioned the flat part below. The perspective view which shows the stopper for extrusion which has arrange | positioned the flat part above. Explanatory drawing which shows the mounting method of the stopper for extrusion. Sectional drawing which shows the medical paste kneading injection device at the time of paste injection. The perspective view which shows the stopper for extrusion of another embodiment without a flat part. The perspective view which shows the stopper for extrusion of another embodiment which formed the finger hook part in the outer surface of the clamping piece.

  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 of the present 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 around 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 D1 of the shaft portion 22 in the main body 31. It opens at the end surface 37 and the outer peripheral surface 38 of the main body 31 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 forming a flat surface. Are formed in a prismatic shape. A 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. 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 incorrectly. 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 1 mm to 5 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 functions as a spacer for maintaining a distance between the partition 21 and the handle portion 24, and is attached to the outer peripheral surface 68 of the shaft portion 22 in a detachable state. As shown in FIGS. 8 and 9, the extrusion stopper 5 includes a stopper main body 71 in which fitting recesses (concave inner surfaces 76 a and 76 b) to be fitted to the outer peripheral surface 68 of the shaft portion 22 are formed. , And a finger hooking portion 72 protruding from the outer surface 73 of the stopper main body 71. In the stopper main body 71, the extrusion stopper 5 is mounted in a state where the end surfaces 81a and 81b located at both ends in the axial direction D1 are in contact with the end surface 37 of the fixed end 35 of the handle portion 24 and the end surface 21b of the partition member 21. (See FIGS. 10 and 11, etc.). The extrusion stopper 5 of the present embodiment is formed using the same resin material as the shaft portion 22 and the handle portion 24, specifically, polycarbonate.

  In the stopper main body 71 of the extrusion stopper 5, two pairs of sandwiching pieces 74 a and 74 b that sandwich the outer peripheral surface 68 of the shaft portion 22 are formed at both ends separated in the axial direction D <b> 1. More specifically, in the stopper main body 71, a pair of first clamping pieces 74a are provided at a position including one end in the axial direction D1, and a pair of second clamping pieces 74b are provided at a position including the other end in the axial direction D1. Yes. The inner surfaces 76a of the pair of first sandwiching pieces 74a and the inner surfaces 76b of the pair of second sandwiching pieces 74b are formed in an arc shape curved with the same curvature as the outer peripheral surface 68 of the shaft portion 22, and the angle of the arc is a semicircle. Has a large concave surface. Moreover, each clamping piece 74a, 74b has flexibility, and the shaft part 22 is engage | inserted by these inner surface 76a, 76b by bending the front end side of each clamping piece 74a, 74b. As a result, the inner surfaces 76a and 76b of the sandwiching pieces 74a and 74b are fitted to the outer peripheral surface 68 of the shaft portion 22. Thus, in the extrusion stopper 5 of the present embodiment, the inner surfaces 76a of the pair of first clamping pieces 74a in the stopper main body 71 constitute the first fitting recesses, and the inner surfaces 76b of the pair of second clamping pieces 74b. The 2nd fitting recessed part is comprised. The inner surface 76a of the first sandwiching piece 74a and the inner surface 76b of the second sandwiching piece 74b are provided away from each other in the axial direction D1.

  In the stopper main body 71, the inner surface 78 of the connection support part 77 located closer to the center part side in the axial direction than the sandwiching pieces 74a, 74b is a semicircular arc-shaped concave surface curved with the same curvature as the outer peripheral surface 68 of the shaft part 22. It has become. When the extrusion stopper 5 is mounted, the outer peripheral surface 68 of the shaft portion 22 is disposed along the inner surface 78 of the connection support portion 77, but the outer peripheral surface of the shaft portion 22 is disposed on the inner surface 78 of the connection support portion 77. 68 only touches and does not have the function of fitting the outer peripheral surface 68. Furthermore, in the stopper main body 71 of the present embodiment, the corners 75 at the both ends in the axial direction D1 (the corners outside the tips of the sandwiching pieces 74a and 74b) are chamfered.

  The finger hook portion 72 is a rib formed on the outer surface 73 of the stopper main body 71 so as to extend along the axial direction. Both of these ribs are formed over the entire length of the stopper body 71. Moreover, these ribs have a cross-sectional shape that becomes thinner toward the tip. As shown in FIG. 9, a flat portion 80 having a flat surface 79 serving as a character printing space is provided on the outer surface 73 side of the extrusion stopper 5. The finger hook portion 72 is formed by projecting both end edges of the flat portion 80 in the width direction orthogonal to the axial direction D1. It can be understood that the pair of ribs are integrally formed on both side edges of the flat portion 80. The extrusion stopper 5 mounted on the outer peripheral surface 68 of the shaft portion 22 pushes the partition member 21 into the cylinder 2 together with the shaft portion 22 to discharge the medical paste from the cylinder 2 (see FIG. 11).

  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 pushing stopper 5 from the outer peripheral surface 68 of the shaft portion 22 by putting a finger on and pulling the finger hanging portion 72 of the stopper main body 71.

  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, thereby rotating the piston 3 in the circumferential direction D2 around the axis of the cylinder 2 and the axial direction. The reciprocating motion of the piston 3 of 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 is unlikely to 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. At this time, the operator inserts the inner surface 76b of the second sandwiching piece 74b into the outer peripheral surface 68 of the shaft portion 22 with the pushing stopper 5 inclined, and then moves the inner surface 76a of the first sandwiching piece 74a to the shaft. By fitting the outer peripheral surface 68 of the portion 22, the extrusion stopper 5 is attached.

  Next, the operator removes the fixing member 4 from the flange portion 12 and the divider 21. Further, as shown in FIG. 11, 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 stopper body 71 of the extrusion stopper 5 is formed with the first sandwiching piece 74a and the second sandwiching piece 74b having concave inner surfaces 76a and 76b. ing. The extrusion stopper 5 is mounted by fitting the inner surfaces 76a, 76b of the sandwiching pieces 74a, 74b to the outer peripheral surface 38 of the shaft portion 22. Since the distance between the partition 21 and the handle portion 24 is maintained by the pushing stopper 5, pressing the handle portion 24 pushes the partition 21 together with the shaft portion 22 into the other end of the cylinder 2 to create a medical paste. Can be discharged from the cylinder 2. Further, a finger hook portion 72 projects from the outer surface 73 of the stopper main body 71, and the pushing stopper 5 can be easily removed from the outer peripheral surface 38 of the shaft portion 22 by applying a force by hooking the finger on the finger hook portion 72. Can be removed. As a result, the workability of the medical paste kneading injector 1 can be improved, and the medical paste kneading work can be performed quickly.

  (2) In the medical paste kneading and injector 1 of the present embodiment, the finger hook portion 72 of the extrusion stopper 5 is a rib formed so as to extend along the axial direction D1. The rib has a cross-sectional shape that becomes thinner toward the tip. With such a shape, a finger can be reliably hooked on the finger hook portion 72 and a force can be reliably applied. Further, the extrusion stopper 5 itself can be reinforced as a whole, and the strength of the extrusion stopper 5 can be increased.

  (3) In the medical paste kneading and injector 1 of the present embodiment, two pairs of sandwiching pieces 74a and 74b are formed at both ends of the stopper main body 71 of the extrusion stopper 5 that are separated in the axial direction D1. Then, the outer peripheral surface 38 of the shaft portion 22 is fitted to the inner surface 76a (first fitting recess) of the first clamping piece 74a and the inner surface 76b (second fitting recess) of the second clamping piece 74b. The stopper 5 is attached to the shaft portion 22. Here, when the stopper 5 for extrusion is formed so that the stopper body 71 as a whole along the axial direction D1 of the shaft portion 22 is fitted to the outer peripheral surface 38 of the shaft portion 22, a large force is required at the time of attaching and detaching. . On the other hand, as in the present embodiment, the extrusion stopper 5 is formed so that the outer peripheral surface 38 of the shaft portion 22 is sandwiched between the inner surfaces 76a and 76b of the holding pieces 74a and 74b provided at both ends of the stopper main body 71. Then, the stopper 5 for extrusion can be easily attached and detached with an appropriate force.

  (4) In the medical paste kneader / injector 1 of the present embodiment, the stopper body 71 has chamfered corners 75 at both ends in the axial direction. In this way, when the extrusion stopper 5 is attached and detached, as shown in FIG. 10, even when the stopper portion 71 is inclined with respect to the axial direction D <b> 1 as shown in FIG. 21b and the end surface 37 of the fixed end 35 of the handle portion 24 are less likely to get caught. As a result, the extrusion stopper 5 can be easily attached and detached, so that the bone paste can be kneaded and injected quickly.

  (5) In the medical paste kneading and injector 1 of the present embodiment, a flat portion 80 having a flat surface 79 serving as a character printing space is provided on the outer surface 73 side of the extrusion stopper 5. The finger hook portion 72 is formed by projecting both end edges of the flat portion 80 in the width direction orthogonal to the axial direction D1. If it does in this way, since a finger | toe can be reliably hooked on the finger hook part 72, the stopper 5 for extrusion can be attached or detached easily. In addition, in the printing space of the flat surface 79 of the flat portion 80, for example, a message such as an appropriate usage method of the extrusion stopper 5 and information such as a product name can be written. Furthermore, since the printing surface is the flat surface 79, it is possible to expect the effect that the printed message and information are easy to read and the printing operation is easy. The extrusion stopper 5 is a component that is used many times by repeatedly attaching and detaching. However, when a message of an appropriate usage method is written on the flat surface 79, the problem that the extrusion stopper 5 is accidentally discarded should be avoided. Can do. Further, since the flat surface 79 is provided, for example, the extrusion stopper 6 can be stably placed by turning the flat surface 79 downward after the extrusion stopper 5 is removed.

  (6) In the medical paste kneading and injector 1 of the present embodiment, the handle portion 24 has a large diameter from the fixed end 35 side facing the one end 28 side of the shaft portion 22 toward the opposite free end 36 side. It is formed in a truncated cone shape. Thus, by making the handle portion 24 into a truncated cone shape, the operability can be improved, and the medical paste can be kneaded efficiently. Further, when the extrusion stopper 5 is mounted, the end surfaces 81 a and 81 b of the extrusion stopper 5 abut on the end surface 37 on the fixed end 35 side of the handle portion 24 and the end surface 21 b of the partition member 21. For this reason, the partition 21 can be reliably pushed into the cylinder 2 together with the shaft portion 22 by pushing the handle portion 24.

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

  In the medical paste kneader / injector 1 of the above embodiment, the flat portion 80 having the flat surface 79 serving as a character printing space is formed on the outer surface 73 side of the extrusion stopper 5. Is not to be done. As shown in FIG. 12, an extrusion stopper 5 </ b> A having no flat portion 80 may be used. Also in the stopper 5A for extrusion, the stopper main body 71A in which inner surfaces 76a and 76b of the holding pieces 74a and 74b to be fitted to the outer peripheral surface 68 of the shaft portion 22 are formed, and the outer surface 73 of the stopper main body 71A project. And a finger-hanging portion 72. Even in this case, the pushing stopper 5 </ b> A can be easily detached from the outer peripheral surface 38 of the shaft portion 22 by applying a force by hooking a finger on the finger-hanging portion 72.

  In the above embodiment, the finger hook portion 72 formed on the outer surface 73 side of the extrusion stoppers 5 and 5A is formed so as to extend along the axial direction D1 of the stopper main bodies 71 and 71A. Is not to be done. For example, as shown in FIG. 13, in the stopper main body 71B, a finger hook portion 72A is provided on the outer surface 73 of the portion corresponding to each sandwiching piece 74a, 74b, and the connecting support portion 77 located on the center portion side in the axial direction D1. The extrusion stopper 5B may be formed on the outer surface 73 of the portion without providing the finger hook portion 72A. Even in this case, the pushing stopper 5B can be easily detached from the outer peripheral surface 38 of the shaft portion 22 by applying a force by hooking the finger on the finger hanging portion 72A.

  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, but the shape of the main body 31 may be changed as appropriate. Specifically, the handle portion may have an elliptical frustum shape or a truncated pyramid-shaped main body portion. Further, the shape of the main body portion of the handle portion is not limited to the frustum shape, and may be a columnar shape, a prismatic shape, a circular shape as long as each end surface 81a, 81b of the extrusion stopper 5 has a contact portion. Other shapes such as a plate shape and a rod shape may be used.

  In the medical paste kneading and injector 1 of the above embodiment, the handle portion 24 is fixed to the shaft portion 22 by being fitted into the guide groove 32 formed in the main body portion 31. The fixing method is not limited to this. For example, a plurality of elastic engaging claws are provided at the end of the shaft portion, and a through-hole having a stepped portion that engages with the plurality of engaging claws of the shaft portion is formed in the main body portion of the handle portion. And you may comprise so that a handle | steering-wheel part may be fixed to a shaft part by engaging the engaging claw of a shaft part with the step part of a main-body part. Furthermore, you may comprise so that a handle | steering-wheel part may be fixed to a shaft part using fixing members, such as a screw.

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

  (1) In the means 1, the handle portion is formed in a truncated cone shape so that the diameter increases from a fixed end side facing the one end side of the shaft portion toward a free end side opposite thereto, A medical paste kneading / injecting device, wherein the extrusion stopper is mounted in a state where the end faces located at both ends of the extrusion stopper are in contact with the end face of the fixed end and the end face of the partitioning tool.

  (2) The medical paste kneading / injecting device according to means 1, wherein the extrusion stopper is formed using the same resin material as that of the shaft portion.

DESCRIPTION OF SYMBOLS 1 ... Medical paste kneading injector 2 ... Cylinder 5, 5A, 5B ... Extrusion stopper 10 ... Opening 13 ... Nozzle part 21 ... Partitioning tool 22 ... Shaft part 23 ... Stirring part 24 ... Handle part 26 ... Through-hole 28 ... Shaft One end of the part 29 ... The other end of the shaft part 68 ... The outer peripheral surface of the shaft part 71, 71A, 71B ... The stopper main body 72, 72A ... The finger hook part 73 ... The outer surface 75 ... The corner part 76a ... The first nipping that becomes the first fitting recess Inner surface 76b of the piece: Inner surface of the second clamping piece serving as the second fitting recess 79 ... Flat surface 80 ... Flat portion D1 ... Axial direction

Claims (5)

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 handle portion fixed to the other end of the shaft portion and located outside the cylinder;
A medical paste kneading and injecting device that functions as a spacer for maintaining a gap between the partition and the handle portion, and includes an extrusion stopper that is attached to the outer peripheral surface of the shaft portion in a removable state,
The stopper for extrusion is formed on the outer surface of the stopper main body and a stopper main body which is disposed so as to be formed to extend along the longitudinal direction of the shaft portion. With a protruding finger rest,
The finger hook portion, when the stopper extrusion shoved the shaft portion in the cylinder in a state attached to the outer peripheral surface of the shaft portion, among the tip is separated from the inner peripheral surface of the cylinder of the cylinder projecting so as not to contact with the peripheral surface, and a medical paste kneading injector, wherein Rukoto arranged site located at least in the cylinder of the stopper body.   The medical paste kneading and injecting device according to claim 1, wherein the finger hanging portion is a rib formed so as to extend along the axial direction.   The fitting recess includes a first fitting recess formed at a position including at least one end in the axial direction in the stopper main body and a second fitting recess formed at a position including at least the other end in the axial direction. The medical paste kneading / injecting device according to claim 1, wherein the first fitting recess and the second fitting recess are provided apart from each other in the axial direction.   The medical paste kneading and injecting device according to any one of claims 1 to 3, wherein the stopper body has chamfered corners at both ends in the axial direction.   A flat portion having a flat surface serving as a character printing space is provided on the outer surface side of the stopper for extrusion, and both end edges of the flat portion protrude in the width direction perpendicular to the axial direction. The medical paste kneading / injecting device according to claim 1, wherein the medical paste kneading / injecting device is formed by:

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