JP2022067708A - Medical paste kneading injector - Google Patents

Abstract

To provide a medical paste kneading injector with which paste raw materials are easily stirred.SOLUTION: A medical paste kneading injector has: a cylinder 20 having a discharge port 32 at one end in an axial direction; a shaft 40 capable of moving in the axial direction in the cylinder 20 and can rotate around an axis line L2; and a plurality of agitation blades 50 that are provided for an outer peripheral surface 43 of an end part 42 on the one end side of the shaft 40 separate in the rotation direction and protrude outward from the outer peripheral surface 43 of the shaft 40. Diameter D3 of the end part 42 on the one end side of the shaft 40 is smaller than inner diameter dimension D1 of the discharge port 32; and width D4 of a connection end 53 connected to the outer peripheral surface 43 of the shaft 40 of the agitation blades 50 is smaller than the inner diameter dimension D1 of the discharge port 32.SELECTED DRAWING: Figure 2

Description

The present invention relates to a medical paste kneading injector.

Conventionally, a medical paste kneading injector for kneading and injecting a medical paste has been known. For example, the medical paste kneading injector described in Patent Document 1 below includes a cylinder and a shaft inserted into the cylinder. A nozzle portion is formed at the tip of the cylinder. A stirring portion is provided at the tip of the shaft. The cylinder is filled with a powdery paste raw material and a liquid. The paste raw material and the liquid are kneaded by reciprocating and rotating the shaft in the axial direction. The well-kneaded paste is delivered from the nozzle portion of the cylinder to the required portion.

Japanese Unexamined Patent Publication No. 2009-11473

In the medical paste kneading injector having the above configuration, if the paste raw material and the liquid are not sufficiently kneaded, it may be difficult to extrude the paste from the cylinder. Therefore, there has been a demand for making it easier to stir the paste raw material.

The present invention has been completed based on the above circumstances, and an object of the present invention is to provide a medical paste kneading injector that makes it easy to stir the paste raw material.

The medical paste kneading injector of the present invention has a cylinder having a discharge port at one end in the axial direction, a shaft capable of moving in the axial direction and rotating around the axis in the cylinder, and the shaft. It has a plurality of stirring blades provided on the outer peripheral surface of the end portion on one end side apart from each other in the rotational direction and protrudes outward from the outer peripheral surface of the shaft, and the diameter of the end portion on the one end side of the shaft is large. The width of the connecting end of the stirring blade, which is smaller than the inner diameter of the discharge port and is connected to the outer peripheral surface of the shaft, is smaller than the inner diameter of the discharge port.

According to the present invention, since the diameter of the end portion on one end side of the shaft is smaller than the inner diameter of the discharge port, it is easy to stir the paste raw material around the discharge port. Further, since a wide region communicating in the axial direction is formed on the connecting end side of the plurality of stirring blades, the powdery paste raw material is easily stirred in the axial direction of the cylinder. Therefore, the paste raw material can be more easily agitated.

Partial notch side view showing the medical paste kneading injector in this embodiment Front view showing a medical paste kneading injector Rear view showing the cap Partially enlarged side view showing the front end of the shaft Front view showing the shaft Partially enlarged side sectional view of a medical paste kneading injector showing a state in which the front end of the shaft is arranged at the front end of the cylinder.

Preferred embodiments of the present invention are shown below.

In the medical paste kneading injector of the present invention, the width of the stirring blade may be smaller than the inner diameter of the discharge port in the total length of the stirring blade in the protruding direction from the outer peripheral surface of the shaft. According to such a configuration, it is possible to secure a wider region communicating in the axial direction even on the protruding end side of the stirring blade, so that the powdery paste raw material can be more easily stirred.

<Example>
Hereinafter, an embodiment embodying the present invention will be described in detail with reference to FIGS. 1 to 6.

In the medical paste kneading injector (hereinafter referred to as kneading injector M) in this embodiment, for example, a powder containing calcium phosphate as a main component and a liquid for curing are kneaded, and the kneaded paste is used as a bone defect in the human body. It is an instrument for supplementing parts and the like. As shown in FIG. 1, the kneading injector M has a cap 10, a cylinder 20, and a shaft 40. Hereinafter, in each component, the cap 10 side will be referred to as the front side, and the side opposite to the cap 10 will be referred to as the rear side.

As shown in FIG. 1, the cylinder 20 has a nozzle portion 21 and a main body portion 24. Powder and liquid are stored inside the cylinder 20. The inside of the cylinder 20 is sealed by the sealing member 25. The seal member 25 is fixed to the rear end portion of the cylinder 20 by the fixing member 26.

The main body 24 has a cylindrical shape. The inner diameter of the main body 24 is constant along the axis L1 of the cylinder 20. A tapered portion 27 is provided at the front end portion of the main body portion 24. The cross section of the tapered portion 27 orthogonal to the axis L1 is a circular shape coaxial with the main body portion 24. The inner diameter of the tapered portion 27 becomes smaller toward the front side. A flange portion 29 is provided at the rear end portion of the main body portion 24. A fixing member 26 is removable from the flange portion 29.

As shown in FIG. 1, the nozzle portion 21 is provided at the front end portion of the cylinder 20. As shown in FIG. 2, the nozzle portion 21 has a cylindrical shape coaxial with the main body portion 24. A plurality of protrusions 31 are provided on the front end surface of the nozzle portion 21. The protrusions 31 are arranged at equal intervals in the circumferential direction.

As shown in FIG. 2, the inner peripheral surface 22 and the outer peripheral surface 23 of the nozzle portion 21 have a cylindrical shape parallel to the axis L1 of the cylinder 20. The nozzle portion 21 is a male screw having a screw (not shown) cut on the outer peripheral surface 23.

The front end of the nozzle portion 21 (one end of the cylinder 20 in the axis L1 direction) has a discharge port 32. As shown in FIG. 2, the discharge port 32 has a circular shape. The inner diameter dimension D1 of the discharge port 32 is equal to the inner diameter dimension of the nozzle portion 21. The inner diameter dimension D1 of the discharge port 32 is smaller than the inner diameter dimension of the main body portion 24.

The cap 10 is attached to the nozzle portion 21 as shown in FIG. The discharge port 32 is closed by the cap 10. The cap 10 has an outer peripheral portion 11 and a central portion 12. The rear surface of the central portion 12 is located behind the rear surface of the outer peripheral portion 11.

As shown in FIG. 3, the outer peripheral portion 11 has a cylindrical portion 13 and a wall-shaped portion 14. Three tubular portions 13 are provided. The three tubular portions 13 are concentric cylindrical shapes. The innermost cylindrical portion 13A is externally fitted to the nozzle portion 21. The inner tubular portion 13A is a female screw having a screw (not shown) cut on the inner peripheral surface. The outermost tubular portion 13B has a plurality of ribs 15. The ribs 15 are arranged on the outer peripheral surface of the outer tubular portion 13B at equal intervals in the circumferential direction. The rib 15 extends in the front-rear direction (see FIG. 1).

As shown in FIG. 3, a plurality of wall-shaped portions 14 are provided. The plurality of wall-shaped portions 14 are radial. The wall-shaped portion 14 connects three tubular portions.

As shown in FIG. 3, the rear surface of the central portion 12 has a circular shape coaxial with the outer peripheral portion 11. The central portion 12 fits into the discharge port 32 of the cylinder 20. The outer diameter dimension D2 of the central portion 12 is substantially equal to the inner diameter dimension D1 of the discharge port 32.

As shown in FIG. 1, the shaft 40 has a long circular rod shape along the axis L2. The shaft 40 penetrates the through hole formed in the seal member 25. The axis L2 of the shaft 40 is arranged on the same straight line as the axis L1 of the cylinder 20 in a state where the shaft 40 is inserted into the cylinder 20. The shaft 40 is movable in the front-rear direction in the cylinder 20. The shaft 40 is rotatable about the axis L2 of the shaft 40 in the cylinder 20. A handle 41 is provided at the rear end of the shaft 40.

As shown in FIG. 2, the diameter (external dimension) D3 of the front end portion (end portion on one end side) 42 of the shaft 40 is smaller than the inner diameter dimension D1 of the discharge port 32. The front surface of the shaft 40 is tapered as shown in FIG. The diameter of the shaft 40 decreases toward the front end.

The front surface of the shaft 40 has a central surface 44 and a peripheral surface 45. The central surface 44 is formed at the center of the shaft 40. The central surface 44 is orthogonal to the axis L2 of the shaft 40. The peripheral surface 45 is inclined with respect to the axis L2 of the shaft 40. The peripheral surface 45 is inclined outward in the radial direction from the outer peripheral edge of the central surface 44 toward the rear side. As shown in FIG. 5, the central surface 44 has a circular shape centered on the axis L2 of the shaft 40. The peripheral surface 45 is formed around the central surface 44. The peripheral surface 45 is an annular shape when viewed from the front.

As shown in FIG. 4, the front end portion 42 of the shaft 40 is provided with a stirring blade 50. The stirring blade 50 projects outward from the outer peripheral surface 43 of the front end portion 42 of the shaft 40. The stirring blade 50 has a triangular shape in a side view. The rear surface 57 of the stirring blade 50 is orthogonal to the axis L2 of the shaft 40. The front surface 58 of the stirring blade 50 is inclined with respect to the axis L2 of the shaft 40. The front surface 58 of the stirring blade 50 has the same slope as the peripheral surface 45 of the shaft 40. The front surface 58 of the stirring blade 50 is continuous with the peripheral surface 45 of the shaft 40. The dimension L3 in the front-rear direction of the connecting end 53 connected to the outer peripheral surface of the shaft 40 of the stirring blade 50 is smaller than the protruding dimension B of the stirring blade 50. As shown in FIG. 6, the front surface 58 of the stirring blade 50 has the same gradient as the inclination of the tapered portion 27 of the cylinder 20.

As shown in FIG. 5, four stirring blades 50 are provided. The stirring blade 50 has a plate shape having a pair of parallel plate surfaces 51. The four stirring blades 50 are arranged radially around the shaft 40. The four stirring blades 50 are arranged at equal intervals in the circumferential direction (rotational direction) of the shaft 40. The angle of the adjacent stirring blades 50 is 90 degrees. The protruding end (tip in the protruding direction of the shaft 40 from the outer peripheral surface 43) 56 of the stirring blade 50 is close to the inner peripheral surface 20A of the cylinder 20 (see FIG. 6). The protruding end 56 of the stirring blade 50 is curved along the inner peripheral surface 20A of the cylinder 20 when viewed from the front.

As shown in FIG. 2, the width (dimension in the rotation direction) D4 of the connecting end 53 of the stirring blade 50 is smaller than the inner diameter dimension D1 of the discharge port 32. The width D4 of the connecting end 53 is the distance between the lines where the pair of plate surfaces 51 intersect with the outer peripheral surface 43 of the shaft 40. The width D4 of the connecting end 53 is smaller than half the outer diameter dimension D3 of the shaft 40. The width D4 of the connecting end 53 is equal to the thickness dimension of the stirring blade 50. The width D4 of the connecting end 53 is equal to the width of the protruding end 56 of the stirring blade 50.

As shown in FIG. 5, four regions 60 are formed around the front end portion 42 of the shaft 40. The four regions 60 have the same shape when viewed from the front. The four regions 60 are symmetrical with respect to the axis L2 of the shaft 40. When viewed from the front, each region 60 has a fan shape when the shaft 40 is inserted into the cylinder 20.

As shown in FIG. 5, each region 60 is partitioned by a first edge 61, a pair of second edges 62, and a third edge 63 when viewed from the front. The first edge 61 is formed by the outer peripheral surface 43 of the front end portion 42 of the shaft 40. The first edge 61 is an arcuate curved surface centered on the axis L2 of the shaft 40. The pair of second edges 62 is formed by the plate surface 51 of the stirring blade 50. The second edge 62 is a flat surface. The third edge 63 is formed by the inner peripheral surface 20A of the cylinder 20. The third edge 63 is an arcuate curved surface centered on the axis L1 of the cylinder 20. The third edge 63 is parallel to the first edge 61.

Next, an example of using the kneading injector M will be described.

First, shake off the powder. Hold the cap 10 side of the cylinder 20 in which the powder is stored and shake it down vigorously. This secures a space for the liquid on the front end side of the cylinder 20.

Next, the liquid is charged into the cylinder 20. Specifically, the cylinder 20 is gripped with the cap 10 facing upward, and the cap 10 is turned counterclockwise to remove it. A syringe tip (not shown) containing the curing liquid is inserted into the nozzle portion 21 of the cylinder 20, and the curing liquid is charged. After that, the cap 10 is turned clockwise and attached to the nozzle portion 21. The cap 10 is tightened until the rotation stops.

Next, the paste is kneaded. Specifically, first, the extrusion stopper (not shown) is removed. Next, the rear portion of the cylinder 20 is grasped, and the front end portion 42 of the shaft 40 is pushed to the tapered portion 27 of the cylinder 20 while rotating the handle 41 left and right (see FIG. 6). At this time, since a wide area 60 is secured between the four stirring blades 50, it is difficult for powder to collect in front of the front surface of the shaft 40. The powder spreads over the entire main body 24 and is agitated by the rotating stirring blade 50.

Then, the front surface 58 of the stirring blade 50 is pressed against the tapered portion 27 of the cylinder 20, and the handle 41 is rotated left and right in small steps several times. As a result, the powder is scraped off from the tapered portion 27. Since a wide area 60 is secured between the stirring blades 50 of the kneading injector M, the powder does not easily stay between the tapered portion 27 and the stirring blades 50. Therefore, the powder can be easily scraped off from the tapered portion 27.

Next, while rotating the handle 41 left and right, the front end portion 42 of the shaft 40 is pulled back to the rear end portion of the cylinder 20. At this time, since a wide region 60 is secured between the four stirring blades 50, it is difficult for powder to collect on the rear side of the stirring blades 50. The powder spreads over the entire main body 24 and is agitated by the rotating stirring blade 50.

Then, the rear surface 57 of the stirring blade 50 is pressed against the seal member 25, and the handle 41 is rotated left and right in small steps several times. As a result, the powder is scraped off from the sealing member 25. Since a wide area 60 is secured between the stirring blades 50 of the kneading injector M, the powder does not easily stay between the sealing member 25 and the stirring blades 50. Therefore, the powder can be easily scraped off from the sealing member 25.

Such an operation of the shaft 40 is repeated. After that, the shaft 40 is moved in the front-rear direction without applying rotation, and it is confirmed that the paste is sufficiently kneaded.

Next, prepare to extrude the paste. Specifically, the handle 41 is pulled to the rear side, and an extrusion stopper (not shown) is attached to the kneading injector M. After that, the fixing member 26 and the cap 10 are removed. This completes the preparation for extruding the paste. When the paste is ready to be extruded, fill the affected area with the paste.

Next, the actions and effects of the examples configured as described above will be described.

The kneading injector M includes a cylinder 20, a shaft 40, and four stirring blades 50. The cylinder 20 has a discharge port 32 at the front end. The shaft 40 can move in the axial direction in the cylinder 20 and rotate about the axis L2. The four stirring blades 50 are provided on the outer peripheral surface 43 of the front end portion 42 of the shaft 40 apart from each other in the rotational direction. The four stirring blades 50 project outward from the outer peripheral surface 43 of the shaft 40. The diameter D3 of the front end portion 42 of the shaft 40 is smaller than the inner diameter dimension D1 of the discharge port 32. The width D4 of the connecting end 53 connected to the outer peripheral surface 43 of the shaft 40 of the stirring blades 50 is smaller than the inner diameter dimension D1 of the discharge port 32. According to this configuration, since the diameter D3 of the front end portion 42 of the shaft 40 is smaller than the inner diameter dimension D1 of the discharge port 32, it is easy to stir the paste raw material around the discharge port 32. Further, the region on the connecting end side of the stirring blade tends to be narrow, but according to this embodiment, the region on the connecting end 52 side can be widened, so that the powdery paste raw material is easily stirred in the axial direction of the cylinder 20. Therefore, the paste raw material can be easily agitated.

The width of the stirring blade 50 is smaller than the inner diameter dimension D1 of the discharge port 32 in the total length in the protruding direction from the outer peripheral surface 43 of the shaft 40. According to this configuration, the region 60 between the four stirring blades 50 can be widened even on the protruding end 56 side of the stirring blade 50, so that the powdery paste raw material can be more easily stirred.

<Other Examples>
The present invention is not limited to the examples described in the above description and drawings, and for example, the following examples are also included in the technical scope of the present invention.
(1) In the above embodiment, the width of the stirring blade 50 is constant in the protruding direction of the stirring blade 50. Not limited to this, the width of the stirring blade may be changed in the protruding direction. For example, the width dimension of the stirring blade may be smaller or larger toward the protruding end.
(2) In the above embodiment, four stirring blades 50 are provided. Not limited to this, the number of stirring blades may be changed.
(3) In the above embodiment, the four stirring blades 50 are aligned in the front-rear direction. Not limited to this, the stirring blades may be provided with the positions shifted in the front-rear direction.
(4) In the above embodiment, the four stirring blades 50 have the same shape. Not limited to this, the shape of the stirring blade may be different for each stirring blade.

D1 ... Inner diameter dimension of discharge port D3 ... Diameter of one end side of shaft D4 ... Width of connecting end L2 ... Shaft axis M ... Kneading injector (medical paste kneading injector)
20 ... Cylinder 32 ... Discharge port 40 ... Shaft 42 ... Front end (end on one end side)
43 ... Outer peripheral surface 50 ... Stirring blade 53 ... Connecting end

Claims (2)

A cylinder with a discharge port at one end in the axial direction,
A shaft capable of moving in the axis direction and rotating around the axis in the cylinder,
It has a plurality of stirring blades provided on the outer peripheral surface of the end portion on the one end side of the shaft apart from each other in the rotational direction and projecting outward from the outer peripheral surface of the shaft.
The diameter of the end portion on the one end side of the shaft is smaller than the inner diameter dimension of the discharge port, and the width of the connecting end of the stirring blade connected to the outer peripheral surface of the shaft is larger than the inner diameter dimension of the discharge port. Also a small medical paste kneading injector. The medical paste kneading injector according to claim 1, wherein the width of the stirring blade is smaller than the inner diameter of the discharge port in the total length of the stirring blade in the protruding direction from the outer peripheral surface of the shaft.

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