JP6967441B2 - How to manufacture the tip of a medical treatment tool - Google Patents

Description

The present invention relates to a method for manufacturing a tip portion of a medical treatment tool.

Conventionally, there is known a medical treatment tool that is inserted into a body cavity and operates a forceps on the distal end side by operating an operation portion provided on the hand side. As the structure of the tip of such a medical treatment tool, for example, a plate-shaped intermediate member (for example, a link member) is arranged in the slit of a cover member having a slit, and the pin member is caulked and fixed. , There is a structure in which a cover member and an intermediate member are rotatably connected.

Further, in Patent Document 1, in a structure in which a pin member is arranged in a through hole formed in a cover member and an intermediate member and the members are rotatably connected to each other, one end side of the pin member is formed from a through hole of each member. Disclosed is a structure in which the members are connected to each other by forming a countersunk portion having a large diameter and fixing the other end side of the pin member to the end of the through hole of the cover member by caulking or the like. There is.

Japanese Patent No. 3238638

However, as described above, when the cover member and the intermediate member are connected by caulking the pin member, for example, the crimping process is performed while pressing the pin member with a punch, so that the width of the slit of the cover member is the original. The pin member is fixed in a state narrower than the width. Therefore, there is a problem that a sufficient gap is not formed between the slit of the cover member and the intermediate member, the frictional resistance between the slit of the cover member and the intermediate member increases, and the rotational performance deteriorates. Therefore, conventionally, operation adjustment work such as wrapping with an abrasive is performed in a post-process, which requires man-hours.

Further, in the structure disclosed in Patent Document 1, when the dish portion formed on one end side of the pin member comes into contact with the dish hole of the cover member, the end surface of the dish portion of the pin member becomes the dish hole of the cover member. By denting inward from the open end, the pin member is not tightly fixed to the cover member. However, since a step is formed at the position of the countersunk hole of the cover member after caulking, there is a risk of damaging the inside of the body cavity during use.

The present invention has been made in view of the above, and is a tip portion of a medical treatment tool capable of manufacturing a tip portion of a medical treatment tool having high rotational performance and no step on the surface in a small number of steps. The purpose is to provide a manufacturing method.

In order to solve the above-mentioned problems and achieve the purpose, the method for manufacturing the tip of the medical treatment tool is a method for manufacturing the tip of the medical treatment tool in which the intermediate member is rotatably connected to the cover member. The intermediate member is arranged in the slit formed in the cover member, and the positions of the first through hole that vertically penetrates the cover member and the second through hole that vertically penetrates the intermediate member. A pin member having a countersunk portion on the lower end side and a machined portion that can be plastically deformed on the upper end side is inserted into the first through hole and the second through hole. The pin member is arranged so that the end surface of the dish portion is located below the lower opening end of the first through hole and the processed portion protrudes from the upper opening end of the first through hole. The pin member arranging step and the first through hole are plastically deformed by pressing the machined portion with a pressing member, bending the cover member so that the width of the slit is reduced, and the plastically deformed machined portion. By the caulking process of caulking so as to fill the countersunk hole formed at the upper opening end of the cover member and by separating the pressing member from the processed portion, the width of the slit is returned to the original width by the elasticity of the cover member. It is characterized by including a dish portion contacting step of bringing the dish portion into close contact with the dish hole formed at the lower opening end of the first through hole.

Further, in the method for manufacturing the tip portion of the medical treatment tool according to the present invention, in the above invention, in the pin member arranging step, the distance from the lower opening end of the first through hole to the end face of the dish portion is It is characterized in that it is equal to the elastic return amount of the cover member after caulking in the dish portion adhesion step.

According to the present invention, since the pin member can be fixed to the cover member without narrowing the width of the slit, the frictional resistance between the slit of the cover member and the intermediate member is small, and the medical treatment tool has high rotational performance. The tip of the can be manufactured in a small number of steps. Further, according to the present invention, since the position of the countersunk hole of the cover member after caulking is not dented, it is possible to manufacture the tip portion of the medical treatment tool having no step on the surface.

FIG. 1 is a cross-sectional view showing a state of an intermediate member arranging step and a pin member arranging step in the method for manufacturing a tip portion of a medical treatment tool according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing a state of a caulking process in the method for manufacturing a tip portion of a medical treatment tool according to an embodiment of the present invention. FIG. 3 is a cross-sectional view showing a state of the dish portion adhesion process in the method for manufacturing the tip portion of the medical treatment tool according to the embodiment of the present invention.

Hereinafter, embodiments of a method for manufacturing a tip portion of a medical treatment tool according to the present invention will be described with reference to the drawings. The present invention is not limited to the following embodiments, and the components in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

(Structure of the tip of medical treatment tool)
In the tip portion 1 of the medical treatment tool, as shown in FIG. 3, the cup members 20a and 20b are rotatably connected to the cover member 10 by the pin member 40. The base end side of the arm portion 22a of the cup member 20a, that is, the opposite side of the cup portion 21a of the cup member 20a is rotatably connected to the plate-shaped link member 31b by the connecting pin 33a. Further, the base end side of the arm portion 22b of the cup member 20b, that is, the opposite side of the cup portion 21b of the cup member 20b is rotatably connected to the plate-shaped link member 31a by a connecting pin (not shown).

Further, the link members 31a and 31b are rotatably connected to the connecting member 32 by the connecting pin 34. The connecting member 32 is connected to an operation wire (not shown), and when the operation wire is pushed and pulled, the arm portions 22a and 22b of the cup members 20a and 20b are driven via the link members 31a and 31b. The cup portions 21a and 21b open and close with the pin member 40 as a fulcrum.

(Composition of each part)
The configuration of each part of the tip portion 1 of the medical treatment tool will be described with reference to FIGS. 1 and 3. As shown in FIG. 3, the tip portion 1 of the medical treatment tool includes a cover member 10, cup members 20a and 20b, link members 31a and 31b, a connecting member 32, a connecting pin 33a, and a connecting pin (not shown). , A connecting pin 34, and a pin member 40.

The cover member 10 is made of an elastically deformable metal material such as stainless steel, and a slit 11 having a predetermined width is formed along a substantially cylindrical axis. Further, the cover member 10 is formed with through holes (first through holes) 12 and 13 that vertically penetrate the cover member 10. These through holes 12 and 13 are formed in a direction perpendicular to the forming direction of the slit 11.

A countersunk hole 14 is formed at the open end of the upper through hole 12. The countersunk hole 14 accommodates the machined portion 420 of the pin member 40 that has been plastically deformed after the caulking process described later. Further, a countersunk hole 15 is formed at the open end of the lower through hole 13. The dish portion 41 of the pin member 40 is accommodated in the dish hole 15 after the dish portion contacting step described later.

The cup members (intermediate members) 20a and 20b are made of metal such as stainless steel, and include cup portions 21a and 21b and arm portions 22a and 22b provided on the base end side of the cup portions 21a and 21b. There is. The cup portions 21a and 21b of the cup member are each formed in a hemispherical shape, and have a symmetrical shape or a meshing shape, respectively. In FIGS. 1 to 3, a part of the cup portion 21a is cut out and shown.

The arm portions 22a and 22b of the cup members 20a and 20b are formed in a plate shape. The combined thickness of the arm portions 22a and 22b of the cup members 20a and 20b is formed to be smaller than the width of the slit 11 of the cover member 10. As a result, a predetermined gap is formed between the arm portions 22a and 22b of the cup members 20a and 20b and the slit 11 after the intermediate member arranging step described later.

The arm portions 22a and 22b of the cup members 20a and 20b are formed with through holes (second through holes) 221a and 221b that vertically penetrate the arm portions 22a and 22b. These through holes 221a and 221b are formed in the thickness direction of the arm portions 22a and 22b.

The link members 31a and 31b are made of metal such as stainless steel and are formed in a strip-shaped plate. Through holes through which the connecting pins 33a and 34 are inserted are formed at both ends of the link member 31b, respectively. Similarly, through holes through which connecting pins and connecting pins 34 (not shown) are inserted are formed at both ends of the link member 31a, respectively. The combined thickness of the link members 31a and 31b is formed to be smaller than the width of the slit 11 of the cover member 10.

The connecting member 32 is made of metal such as stainless steel and is formed in a substantially cylindrical shape. The outer diameter of the connecting member 32 is smaller than the inner diameter of the substantially cylindrical cover member 10. At one end of the connecting member 32, a through hole through which the connecting pin 34 is inserted is formed in a direction perpendicular to the axial direction of the connecting member 32.

The connecting pin 33a is made of metal such as stainless steel and has a countersunk portion at one end. The connecting pin 33a rotatably connects the cup member 20a and the link member 31b, and the countersunk portion and the shaft portion at the other end are expanded in diameter by caulking or the like to prevent them from coming off.

The connecting pin (not shown) is made of metal such as stainless steel and has a countersunk portion at one end. The connecting pin (not shown) rotatably connects the cup member 20b and the link member 31a, and the countersunk portion and the shaft portion at the other end are expanded in diameter by caulking or the like to prevent them from coming off.

The connecting pin 34 is made of metal such as stainless steel and has a countersunk portion at one end. The connecting pin 34 rotatably connects the link members 31a and 31b and the connecting member 32, and the countersunk portion and the shaft portion at the other end are expanded in diameter by caulking or the like to prevent them from coming off.

The pin member 40 is made of metal such as stainless steel, and as shown in FIG. 1, has a countersunk portion 41 at one end (lower end side) and a plastically deformable processed portion 42 at the other end (upper end side). ing. The pin member 40 rotatably connects the cover member 10 and the cup members 20a and 20b. The shaft diameter of the pin member 40 is formed to be smaller than the through holes 12 and 13 of the cover member 10 and the through holes 221a and 221b of the cup members 20a and 20b. As a result, a predetermined gap is formed between the pin member 40 and the through holes 12, 13, 221a, 221b after the pin member arranging step described later.

It is preferable that the dish portion 41 of the pin member 40 is set to have a shape that fits exactly in the dish hole 15 of the cover member 10. The total length of the pin member 40 shown in FIG. 1 is "(depth A of the recess 511 of the jig 51) + (thickness B of the cover member 10)-(depth C of the countersunk hole 14) + (the depth of the countersunk hole 14). Volume / cross-sectional area of the machined portion 42) ”is preferable. By setting the total length of the pin member 40 to such a value, when the machined portion 42 plastically deformed in the caulking process described later becomes a machined portion 420 having a diameter larger than the shaft diameter of the pin member, a countersunk hole is formed. The shape fits within 14.

(Manufacturing method of the tip of medical treatment tool)
A method for manufacturing the tip portion 1 of the medical treatment tool according to the present embodiment will be described with reference to FIGS. 1 to 3. In the method for manufacturing the tip portion 1 of the medical treatment tool, the tip portion 1 of the medical treatment tool is manufactured by rotatably connecting the cup members 20a and 20b, which are intermediate members, to the cover member 10.

In this embodiment, the jig 51 and the punch 52 are used for caulking. The jig 51 is formed with a recess 511 having a predetermined depth. It is preferable that the depth of the recess 511 of the jig 51 is set to be equal to the elastic return amount of the cover member 10 after caulking, which will be described later. Further, the shape of the recess 511 is larger than that of the dish portion 41 of the pin member 40. In the present embodiment, the shape is a circle having a diameter slightly larger than that of the dish 41. Further, the punch 52 is provided in a caulking device (not shown).

In the method for manufacturing the tip portion 1 of the medical treatment tool according to the present embodiment, an intermediate member arranging step, a pin member arranging step, a caulking processing step, and a dish portion close contact step are sequentially performed. It should be noted that the final dish portion adhesion step is a step that is automatically performed when the caulking process is completed, without performing any separate processing.

First, in the intermediate member arranging step, as shown in FIG. 1, the arm portions 22a and 22b of the cup members 20a and 20b are arranged in the slit 11 formed in the cover member 10, and the through holes 12 and 13 of the cover member 10 are arranged. And the through holes 221a and 221b of the cup members 20a and 20b are aligned with each other.

Subsequently, in the pin member arranging step, as shown in FIG. 1, the pin member 40 is inserted into the through holes 12, 13 of the cover member 10 and the through holes 221a, 221b of the cup members 20a, 20b from the side of the through holes 13. do. Then, the pin member 40 is arranged so that the end surface 41a of the dish portion 41 is located below the lower opening end of the through hole 13 and the processed portion 42 protrudes from the upper opening end of the through hole 12.

Specifically, a set in which the pin member 40 is inserted into the through holes 12 and 13 of the cover member 10 and the through holes 221a and 221b of the cup members 20a and 20b is arranged in the jig 51. At that time, the dish portion 41 of the pin member 40 is arranged so as to fit in the recess 511 of the jig 51. As a result, the dish portion 41 of the pin member 40 can be arranged below the lower opening end of the through hole 13 by the depth of the recess 511. Further, the total length of the pin member 40 is "(depth A of the recess 511 of the jig 51) + (thickness B of the cover member 10)-(depth C of the countersunk hole 14) + (volume of the countersunk hole 14 /). Since it is the cross-sectional area of the machined portion 42) ”, the machined portion 42 naturally protrudes from the upper opening end of the through hole 12.

Subsequently, in the caulking process, as shown in FIG. 2, the punch 52 is lowered by using a caulking device (not shown), and the processed portion 42 of the pin member 40 is pressed by the punch 52 to be plastically deformed and the slit 11 is formed. The cover member 10 is bent so that the width of the cover member 10 is reduced. At this time, the processed portion 42 of the pin member 40 is plastically deformed so as to fill the countersunk hole 14, and the pin member 40 is engaged with and fixed to the cover member 10. At that time, as the width of the slit 11 is reduced, there is almost no gap between the arm portions 22a and 22b of the cup members 20a and 20b and the slit 11.

In this embodiment, caulking is performed by the radial caulking method. Specifically, the machined portion 42 of the pin member 40 is plastically deformed by lowering the punch 52 that performs a rosette-shaped axial motion, and the countersunk hole 14 of the cover member 10 is filled with the plastically deformed machined portion 42. The pin member 40 is fixed to the cover member 10 by forming a processed portion 420 that is combined and prevented from coming off.

Subsequently, in the countersunk portion adhesion step, as shown in FIG. 3, the punch 52 is raised and separated from the processed portion 420 of the pin member 40 after caulking, so that the width of the slit 11 is reduced by the elasticity of the cover member 10. Spread to the width of. As a result, the pin member 40 fixed to the dish hole 14 of the cover member 10 is pulled upward by the amount of elastic return of the cover member 10, and the dish portion 41 of the pin member 40 is brought to the dish of the cover member 10 accordingly. It adheres to the hole 15. At that time, as the width of the slit 11 increases, a gap is formed again between the arm portions 22a and 22b of the cup members 20a and 20b and the slit 11. By the above steps, the cup members 20a and 20b are rotatably connected to the cover member 10.

Here, in the pin member arranging step, as described above, "(depth A of the recess 511 of the jig 51) + (thickness B of the cover member 10)-(depth C of the dish hole 14) + (dish). By using the pin member 40 having the total length of "volume of the hole 14 / cross-sectional area of the machined portion 42)", the end surface 42a of the machined portion 420 and the upper surface 10a of the cover member 10 after the countersunk portion adhesion process become the same surface and a step is formed. Can be eliminated.

Further, in the pin member arranging step, the distance from the lower opening end of the through hole 13 of the cover member 10 to the end surface 41a of the dish portion 41 of the pin member 40 is set equal to the elastic return amount of the cover member 10 after caulking. As a result, after the dish portion close contact process, the end surface 41a of the dish portion 41 and the lower surface 10b of the cover member 10 become the same surface, and a step can be eliminated.

According to the method for manufacturing the tip portion 1 of the medical treatment tool according to the present embodiment as described above, the pin member 40 can be fixed to the cover member 10 without narrowing the width of the slit 11, so that the cover can be covered. The tip portion 1 of a medical treatment tool having a small frictional resistance between the slit 11 of the member 10 and the arm portions 22a and 22b of the cup members 20a and 20b and having high rotational performance can be manufactured in a small number of steps.

Further, according to the method for manufacturing the tip portion 1 of the medical treatment tool according to the present embodiment, the tip portion 1 of the medical treatment tool that does not require operation adjustment work such as wrapping can be manufactured, so that the man-hours can be reduced. Can be reduced. Further, according to the method for manufacturing the tip portion 1 of the medical treatment tool according to the present embodiment, there is no dent at the position of the countersunk hole 15 of the cover member 10 after caulking, so that there is no step on the surface and the product is used. It is possible to manufacture the tip portion 1 of a medical treatment tool that does not sometimes damage the inside of the body cavity.

Although the method for manufacturing the tip of the medical treatment tool according to the present invention has been specifically described above in terms of the mode for carrying out the invention, the gist of the present invention is not limited to these descriptions, and the patent. It must be broadly interpreted based on the statement of claims. Needless to say, various changes, modifications, etc. based on these descriptions are also included in the gist of the present invention.

For example, in the present embodiment, the tip portion 1 of the medical treatment tool includes hemispherical cup members 20a and 20b, but instead of the cup members 20a and 20b, for example, an elliptical spherical shape or scissors. It may be provided with flat forceps or the like. Further, although the radial caulking method is used in this embodiment, another caulking method such as high spin caulking may be used.

1 Tip of medical treatment tool 10 Cover member 10a Upper surface 10b Lower surface 11 Slit 12,13 Through hole 14,15 Countersunk hole 20a, 20b Cup member 21a, 21b Cup part 22a, 22b Arm part 221a, 221b Through hole 31a, 31b Link member 32 Connecting member 33a, 34 Connecting pin 40 Pin member 41 Dish part 41a End face 42,420 Machining part 42a End face 51 Jig 511 Depression 52 Punch

Claims (2)

A method for manufacturing a tip of a medical treatment tool in which an intermediate member inserted through a slit of a cover member is rotated about a rotation axis extending in the thickness direction of the slit with respect to the cover member.
The intermediate member is disposed within the slit formed in the cover member, and the consistent hole penetrating the second side surface side from the first side surface along said cover member in the thickness direction of the slit, said intermediate an intermediate member disposing step to position the second consistent hole penetrating along the member in the thickness direction of the slit,
Having a pan at one end, and a pin member having a plastically deformable processing unit at the other end, a through said second consistency hole from a first side of said first integrated hole second side is inserted into the side, so that the end face of the pan protrudes outward from the edge of the dish-hole formed in the open end of the end face of the first side surface side in the first integrated hole, and A pin member arranging step of arranging the pin member so that the processed portion protrudes outward from the bottom of the second countersunk hole formed at the opening end of the end surface on the second side surface side of the first through hole.
The machined portion is plastically deformed by being pressed by a pressing member, the cover member is elastically deformed so that the width of the slit is reduced, and the plastically deformed machined portion is caulked so as to fill the second countersunk hole. The caulking process and
A dish portion contacting step in which the width of the slit is widened to the original width by the elasticity of the cover member by separating the pressing member from the processed portion, and the dish portion is brought into close contact with the first dish hole.
Including
In the pin member arranging step, the distance from the edge portion of the first dish hole to the end surface of the dish portion of the pin member is equal to the elastic return amount of the cover member after caulking in the dish portion adhesion step. Moreover, the distance from the bottom of the second countersunk hole to the end face of the machined portion of the pin member is set so as to be contained in the second countersunk hole when the machined portion is plastically deformed in the caulking process. ,
A method for manufacturing the tip of a medical treatment tool. The total length of the pin member is (thickness of the cover member) + (distance from the edge portion of the first countersunk hole to the end face of the countersunk portion in the pin member arranging process)-(depth of the second countersunk hole). + (Volume of the second countersunk hole / cross-sectional area of the machined portion)
The method for manufacturing the tip of a medical treatment tool according to claim 1.

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