Medical forceps

Abstract

To provide medical forceps in which movement of portions other than rotating parts arranged at a tip is small.SOLUTION: Medical forceps (1) comprise a first shaft part (10), a second shaft part (20), a first rotating part (30), a second rotating part (40), and a pin (70). The pin (70) penetrates a first through hole (31A) and a second through hole (41A). The second shaft part (20) includes a first drive part for rotating the first rotating part (30) around the first through hole (31A) when the second shaft part (20) slides with respect to the first shaft part (10), and a second drive part for rotating the second rotating part (40) around the second through hole (41A) in a direction opposite to that of the first rotating part when the second shaft part (20) slides with respect to the first shaft part (10).SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present disclosure relates to medical forceps.

Background Art

[0002] Medical forceps for collecting a part of human or animal tissue or removing foreign matter attached to human or animal tissue are known (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In medical forceps, tissue collection or foreign matter removal may be performed through a narrow space. Therefore, for medical forceps, when collecting the target tissue or holding foreign matter, it may be required that the movement of parts other than the rotating part (jaw part) arranged at the tip is small.

[0005] One of the objects of the present disclosure is to provide medical forceps in which the movement of parts other than the rotating part arranged at the tip is small.

Means for Solving the Problems

[0006] The medical forceps according to the present disclosure include a first shaft portion extending in a first direction, a second shaft portion extending in the first direction and arranged to be slidable relative to the first shaft portion in the first direction, a first base portion located between the first shaft portion and the second shaft portion, and a first exposed portion exposed outside the space between the first shaft portion and the second shaft portion, and a first rotating portion including the first exposed portion; a second base portion located between the first shaft portion and the second shaft portion, and a second exposed portion exposed outside the space between the first shaft portion and the second shaft portion, and a second rotating portion including the second exposed portion; and a pin extending in a second direction perpendicular to the first direction and in which the first shaft portion and the second shaft portion overlap, passing through the first rotating portion and the second rotating portion and fixed to the first shaft portion. A first through hole penetrating the first base portion in the second direction is formed in the first base portion. A second through hole penetrating the second base portion in the second direction is formed in the second base portion. The pin passes through the first through hole and the second through hole. The second shaft portion includes a first driving portion that rotates the first rotating portion around the first through hole when the second shaft portion slides relative to the first shaft portion, and a second driving portion that rotates the second rotating portion around the second through hole in a direction opposite to the first rotating portion when the second shaft portion slides relative to the first shaft portion.

Advantages of the Invention

[0007] According to the above medical forceps, it is possible to provide medical forceps in which the movement of portions other than the rotating portion disposed at the tip is small.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

DETAILED DESCRIPTION OF THE INVENTION

[0009] [Overview of the Embodiment] The medical forceps according to the present disclosure include a first shaft portion extending in a first direction, a second shaft portion extending in the first direction and disposed slidably relative to the first shaft portion in the first direction, a first base portion located between the first shaft portion and the second shaft portion, and a first exposed portion exposed outside the space between the first shaft portion and the second shaft portion, and a first rotating portion including the first base portion and the first exposed portion; a second base portion located between the first shaft portion and the second shaft portion, and a second exposed portion exposed outside the space between the first shaft portion and the second shaft portion, and a second rotating portion including the second base portion and the second exposed portion; and a pin extending in a second direction perpendicular to the first direction and in which the first shaft portion and the second shaft portion overlap, passing through the first rotating portion and the second rotating portion and fixed to the first shaft portion. A first through hole penetrating the first base portion in the second direction is formed in the first base portion. A second through hole penetrating the second base portion in the second direction is formed in the second base portion. The pin passes through the first through hole and the second through hole. The second shaft portion includes a first driving portion that rotates the first rotating portion around the first through hole when the second shaft portion slides relative to the first shaft portion, and a second driving portion that rotates the second rotating portion around the second through hole in a direction opposite to the first rotating portion when the second shaft portion slides relative to the first shaft portion.

[0010] In the medical forceps of the present disclosure, the first shaft portion, the second shaft portion, the first rotating portion, the second rotating portion, and the pin are arranged as described above. As a result, when the second shaft portion slides relative to the first shaft portion, the first rotating portion and the second rotating portion rotate in opposite directions around the through hole through which the pin passes. As a result, the rotating portion can be opened and closed only by the relative sliding of the shaft portions. Moreover, since the two rotating portions can perform a double-opening operation of rotating in opposite directions to each other, the sliding amount of the shaft portion can be minimized, and the swing of the shaft portion associated with the operation of the user sliding the shaft portion can also be minimized. Thus, according to the medical forceps of the present disclosure, it is possible to provide medical forceps in which the movement of portions other than the rotating portion disposed at the tip is small.

[0011] In the medical forceps, the first base portion may be disposed away from the first through hole in a third direction perpendicular to the first and second directions, and may include a first protrusion that protrudes in the second direction toward the second shaft portion. The second base portion may be disposed away from the second through hole on a side opposite to the first protrusion in the third direction, and may include a second protrusion that protrudes in the second direction toward the second shaft portion. The first driving portion may be a wall surface of a first groove that is formed in the second shaft portion, accommodates a region including the tip of the first protrusion, and guides the first protrusion when the second shaft portion slides relative to the first shaft portion. The second driving portion may be a wall surface of a second groove that is formed in the second shaft portion, accommodates a region including the tip of the second protrusion, and guides the second protrusion when the second shaft portion slides relative to the first shaft portion. By employing such a structure, the first rotating portion and the second rotating portion can easily rotate in opposite directions when the second shaft portion slides relative to the first shaft portion.

[0012] In the medical forceps, the first base portion may include a third protrusion that protrudes from a region corresponding to the first protrusion in the second direction toward the opposite side from the first protrusion. The second base portion may include a fourth protrusion that protrudes from a region corresponding to the second protrusion in the second direction toward the opposite side from the second protrusion. The first shaft portion may be formed with a third groove that accommodates a region including the tip of the third protrusion and guides the third protrusion when the second shaft portion slides relative to the first shaft portion, and a fourth groove that accommodates a region including the tip of the fourth protrusion and guides the fourth protrusion when the second shaft portion slides relative to the first shaft portion. In this way, the protrusions that protrude in opposite directions from the first pivot portion and the second pivot portion are guided by the respective grooves, thereby stabilizing the rotational movements of the first pivot portion and the second pivot portion.

[0013] In the above medical forceps, when viewed along the second direction, the first groove portion and the second groove portion may be arranged symmetrically with respect to a center line that extends along the first direction and is a straight line with equal distances from the first groove portion and the second groove portion. Thereby, it is possible to provide medical forceps that are easy to use in which the first rotating portion and the second rotating portion operate symmetrically with respect to each other.

[0014] In the above medical forceps, a fifth groove portion extending along the first direction may be formed in the second shaft portion. When the second shaft portion slides with respect to the first shaft portion, a part of the pin may move in the fifth groove portion in the first direction. In this way, by forming a groove portion that allows the movement of the pin in the second shaft portion, the operation of the medical forceps of the present disclosure can be easily achieved.

[0015] The above medical forceps further includes a first holding portion connected to a first base end portion that is an end portion of the first shaft portion on the side opposite to the side where the first rotating portion and the second rotating portion are arranged in the first direction, and a second holding portion connected to a second base end portion that is an end portion of the second shaft portion on the side opposite to the side where the first rotating portion and the second rotating portion are arranged in the first direction. The first holding portion may include a third shaft portion connected to the first shaft portion, and a first finger hole portion having an annular shape connected to an end portion of the third shaft portion in the longitudinal direction of the third shaft portion on the side opposite to the side connected to the first shaft portion. The second holding portion may include a fourth shaft portion connected to the second shaft portion, and a second finger hole portion having an annular shape connected to an end portion of the fourth shaft portion in the longitudinal direction of the fourth shaft portion on the side opposite to the side connected to the second shaft portion. The fourth shaft portion may be farther away from the third shaft portion as it moves away from the second shaft portion. The second shaft portion may slide with respect to the first shaft portion by changing the distance between the first finger hole portion and the second finger hole portion. In this way, by connecting the first holding portion and the second holding portion including the finger hole portions to the first shaft portion and the second shaft portion, respectively, it is possible to provide medical forceps that are easy to operate.

[0016] When the distance between the first finger hole portion and the second finger hole portion of the medical forceps is changed, a plane including the trajectories of the first finger hole portion and the second finger hole portion and a plane including the trajectories of the first pivot portion and the second pivot portion may intersect. With this configuration, when a user moves the first finger hole portion and the second finger hole portion in a certain plane, the first pivot portion and the second pivot portion can be moved in a plane different from the plane.

[0017] [Specific example of embodiment] Next, an example of a specific embodiment of the medical forceps of the present disclosure will be described with reference to the drawings. In the following drawings, the same or corresponding parts are designated by the same reference numerals, and description thereof will not be repeated.

[0018] 1 to 3, medical forceps 1 includes a first shaft portion 10, a second shaft portion 20, a first holding portion 50, a second holding portion 60, a first rotating portion 30, a second rotating portion 40, and a pin 70. The first shaft portion 10, the second shaft portion 20, the first holding portion 50, the second holding portion 60, the first rotating portion 30, the second rotating portion 40, and the pin 70 are all made of metal. The metal constituting the first shaft portion 10, the second shaft portion 20, the first holding portion 50, the second holding portion 60, the first rotating portion 30, the second rotating portion 40, and the pin 70 can be stainless steel such as JIS standard SUS304.

[0019] The first shaft portion 10 extends in the X-axis direction, which is a first direction, and includes a first distal end portion 10A, which is the distal end portion, and a first proximal end portion 10B, which is the proximal end portion. The second shaft portion 20 extends in the X-axis direction like the first shaft portion 10, and includes a second distal end portion 20A, which is the distal end portion, and a second proximal end portion 20B, which is the proximal end portion. The second shaft portion 20 is arranged to be slidable relative to the first shaft portion 10 in the X-axis direction while making contact with the first shaft portion 10. The first rotating portion 30 and the second rotating portion 40 are arranged near the first distal end portion 10A and the second distal end portion 20A.

[0020] The first holding part 50 is connected to the first base end part 10B of the first shaft part 10. In the present embodiment, the first shaft part 10 and the first holding part are integral parts, but the first shaft part 10 and the first holding part may be separate parts. The second holding part 60 is connected to the second base end part 20B of the second shaft part 20. The first holding part 50 includes a third shaft part 51 connected to the first shaft part 10, and an annular first finger hole part 52 connected to an end part of the third shaft part 51 on the side opposite to the side connected to the first shaft part 10 in the longitudinal direction of the third shaft part 51. The second holding part 60 includes a fourth shaft part 61 connected to the second shaft part 20, and an annular second finger hole part 62 connected to an end part of the fourth shaft part 61 on the side opposite to the side connected to the second shaft part 20 in the longitudinal direction of the fourth shaft part 61.

[0021] The third shaft part 51 is bent in the Y-axis direction, which is a direction perpendicular to the X-axis direction, which is the first direction, and is the second direction in which the first shaft part 10 and the second shaft part overlap, and is connected to the first shaft part 10. That is, the third shaft part 51 is bent and connected in the X-Y plane with respect to the first shaft part 10 extending in the X-axis direction. The fourth shaft part 61 is bent in the Y-axis direction, which is the second direction, and is connected to the second shaft part 20. The fourth shaft part 61 is bent and connected in the X-Y plane with respect to the second shaft part 20 extending in the X-axis direction.

[0022] The fourth shaft portion 61 is farther away from the third shaft portion 51 as it moves away from the second shaft portion 20. That is, the fourth shaft portion 61 is bent more greatly than the third shaft portion 51 with respect to the X-axis direction. Referring to FIGS. 1 and 2, by changing the distance between the first finger hole portion 52 and the second finger hole portion 62, the second shaft portion 20 slides while contacting the first shaft portion 10 with respect to the first shaft portion 10. More specifically, when the first finger hole portion 52 and the second finger hole portion 62 are moved in the direction of arrow A (see FIG. 1) to increase the distance between the first finger hole portion 52 and the second finger hole portion 62, the second shaft portion 20 slides toward the first base end portion 10B side of the first shaft portion 10 with respect to the first shaft portion 10. On the other hand, when the first finger hole portion 52 and the second finger hole portion 62 are moved in the direction of arrow B (see FIG. 2) to decrease the distance between the first finger hole portion 52 and the second finger hole portion 62, the second shaft portion 20 slides toward the first tip end portion 10A side of the first shaft portion 10 with respect to the first shaft portion 10.

[0023] Referring to FIGS. 4, 5, and 1 to 3, the first rotating portion 30 includes a first base portion 31 located between the first shaft portion 10 and the second shaft portion 20, and a first exposed portion 32 exposed outside the space between the first shaft portion 10 and the second shaft portion 20. A first through hole 31A penetrating the first base portion 31 in the Y-axis direction, which is the second direction, is formed in the first base portion 31. The first base portion 31 is arranged away from the first through hole 31A in the Z-axis direction, which is the third direction perpendicular to the X-axis direction and the Y-axis direction, and includes a first protruding portion 31C protruding in the Y-axis direction toward the second shaft portion 20. The first base portion 31 includes a first thick portion 31B protruding in the Y-axis direction toward the second shaft portion 20 because the thickness in the Y-axis direction is larger than other regions of the first base portion 31 (and further compared to other regions of the first rotating portion 30). The top surface (upper surface) of the first thick portion 31B is a stepped portion with a larger height than other regions of the first base portion 31. The first protruding portion 31C is arranged on the first thick portion 31B.

[0024] The first base portion 31 includes a third protruding portion 31D that protrudes in a direction opposite to the first protruding portion 31C along the Y-axis direction from a region that coincides with the first protruding portion 31C when viewed in the Y-axis direction. The surface of the first base portion 31 (and further the first rotating portion 30) on the side opposite to the side where the first thick portion 31B and the first protruding portion 31C are disposed in the Y-axis direction is flat in a region other than the third protruding portion 31D. A first notch portion 32B is formed in a region away from the tip 30A of the first exposed portion 32. The first notch portion 32B is formed between the tip 30A and the first through hole 31A.

[0025] Referring to FIGS. 6, 7, and 1 to 3, the second rotating portion 40 includes a second base portion 41 located between the first shaft portion 10 and the second shaft portion 20, and a second exposed portion 42 exposed outside the space between the first shaft portion 10 and the second shaft portion 20. A second through hole 41A penetrating the second base portion 41 in the Y-axis direction, which is the second direction, is formed in the second base portion 41. The second base portion 41 is disposed away from the second through hole 41A in the Z-axis direction, which is the third direction, and includes a second protruding portion 41C protruding in the Y-axis direction toward the second shaft portion 20. The surface of the second base portion 41 (and further the second rotating portion 40) on which the second protruding portion 41C is formed is flat in a region other than the second protruding portion 41C.

[0026] The second base portion 41 includes a fourth protruding portion 41D that protrudes in a direction opposite to the second protruding portion 41C along the Y-axis direction from a region that coincides with the second protruding portion 41C when viewed in the Y-axis direction. The second base portion 41 includes a second thick portion 41B that protrudes in the Y-axis direction toward the first shaft portion 10 because the thickness in the Y-axis direction is larger than other regions of the second base portion 41 (and further larger than other regions of the second rotating portion 40). The top surface (bottom surface) of the second thick portion 41B is a stepped portion with a larger height than other regions of the second base portion 41. The second protruding portion 41C is disposed on the second thick portion 41B. A second notch portion 42B is formed in a region away from the tip 40A of the second exposed portion 42. The second notch portion 42B is formed between the tip 40A and the second through hole 41A.

[0027] The wall surfaces of the first exposed portion 32 and the second exposed portion 42 that define the first notch portion 32B and the second notch portion 42B may be perpendicular to the XZ plane, as shown in FIGS. 4 to 7. This makes it easier to hold a foreign object, for example, by closing the first pivoting portion 30 and the second pivoting portion 40, as described below, so that the wall surface of the first exposed portion 32 that defines the first notch portion 32B faces the wall surface of the second exposed portion 42 that defines the second notch portion 42B. On the other hand, the wall surfaces of the first exposed portion 32 and the second exposed portion 42 that define the first notch portion 32B and the second notch portion 42B may be sharp blades. This makes it possible to cut and remove or collect a portion of human tissue, for example, by closing the first pivoting portion 30 and the second pivoting portion 40, as described below.

[0028] In this embodiment, the first rotating portion 30 and the second rotating portion 40 have the same shape. That is, the first rotating portion 30 and the second rotating portion 40 are the same part. The part that is the first rotating portion 30 can be used as the second rotating portion 40 by changing its orientation.

[0029] Next, the structure near the tip ends of the first shaft portion 10 and the second shaft portion 20 will be described in detail with reference to Figures 8 to 11. Figures 8 and 9 are enlarged perspective views of the first shaft portion 10 and the second shaft portion 20 as seen from the same perspective as Figures 1 and 2. Figures 10 and 11 are enlarged perspective views of the first shaft portion 10 and the second shaft portion 20 as seen in the opposite direction to Figures 1 and 2.

[0030] The first shaft portion 10 faces the second shaft portion 20 and includes a first contact surface 15, which is a surface that comes into contact with the second shaft portion 20. The first contact surface 15 is a surface that is perpendicular to the Y-axis direction in which the first shaft portion 10 and the second shaft portion 20 overlap, i.e., a plane that is along the XZ plane. A guide groove 16 is formed in the first contact surface 15, extending along a center line C of the first contact surface 15 in the Z-axis direction.

[0031] The second shaft portion 20 faces the first shaft portion 10 and includes a second contact surface 25 that is a surface that comes into contact with the first shaft portion 10. The second contact surface 25 is a plane that extends along the XZ plane. The first contact surface 15 of the first shaft portion 10 and the second contact surface 25 of the second shaft portion 20 come into contact with each other. A guide protrusion 26 that extends along the center line C is formed on the second contact surface 25. When the first contact surface 15 and the second contact surface 25 are in contact with each other, the guide protrusion 26 enters the guide groove 16. The combination of the guide groove 16 and the guide protrusion 26 allows the second shaft portion 20 to slide relative to the first shaft portion 10 in the X-axis direction.

[0032] The combination of the guide groove and the guide protrusion is not limited to the above combination, and for example, the guide protrusion may be formed on the first shaft portion 10, and the guide groove may be formed on the second shaft portion 20. Furthermore, the combination of the guide groove and the guide protrusion does not have to be one set, and multiple sets may be used.

[0033] The first shaft portion 10 includes a first opposing surface 19 in a region including the first tip portion 10A, which faces the second shaft portion 20 with a gap therebetween. The first opposing surface 19 is a plane along the XZ plane. The first opposing surface 19 is disposed adjacent to the first contact surface 15. In the first shaft portion 10, the region where the first opposing surface 19 is disposed has a smaller thickness in the Y-axis direction than the region where the first contact surface 15 is disposed. A step is formed between the first opposing surface 19 and the first contact surface 15.

[0034] When viewed in the Y-axis direction, first fixing hole 12 is formed in a region through which center line C of first opposing surface 19 passes. When viewed in the Y-axis direction, center line C passes through the center of first opposing surface 19 in the Z-axis direction. First fixing hole 12 is disposed in the center of first opposing surface 19 in the Z-axis direction. With reference to FIGS. 8 and 10 , first fixing hole 12 in this embodiment is a through-hole, but may also be a hole with a bottom, i.e., a recess. First fixing hole 12 is a hole that receives a region including tip portion 73 of pin 70, which will be described later, and fixes pin 70.

[0035] A third groove 13 and a fourth groove 14 are formed in the first opposing surface 19. When viewed in the Y-axis direction, the third groove 13 and the fourth groove 14 are disposed symmetrically with respect to the center line C. When viewed in the Y-axis direction, the third groove 13 and the fourth groove 14 extend so as to approach the center line C with increasing distance from the first tip portion 10A. The third groove 13 accommodates a region including the tip of a third protrusion 31D formed in the first root portion 31 of the first pivoting portion 30, and guides the third protrusion 31D when the second shaft portion 20 slides relative to the first shaft portion 10. The fourth groove 14 accommodates a region including the tip of a fourth protrusion 41D formed in the second root portion 41 of the second pivoting portion 40, and guides the fourth protrusion 41D when the second shaft portion 20 slides relative to the first shaft portion 10.

[0036] The second shaft portion 20 includes a second opposing surface 29 in a region including the second tip portion 20A, the second opposing surface 29 facing the first shaft portion 10 across a gap. The second opposing surface 29 is a plane along the XZ plane. The second opposing surface 29 is disposed adjacent to the second contact surface 25. In the second shaft portion 20, the region where the second opposing surface 29 is disposed has a smaller thickness in the Y-axis direction than the region where the second contact surface 25 is disposed. A step is formed between the second opposing surface 29 and the second contact surface 25.

[0037] When viewed in the Y-axis direction, a fifth groove portion 21 extending along the X-axis direction (extending along the center line C) is formed in a region through which the center line C of the second opposing surface 29 passes. As will be described later, when the second shaft portion 20 slides relative to the first shaft portion 10, a part of the pin 70 (a region including the head portion 71) moves in the X-axis direction within the fifth groove portion 21. When viewed in the Y-axis direction, the center line C passes through the center of the second opposing surface 29 in the Z-axis direction. The fifth groove portion 21 is disposed in the center of the second opposing surface 29 in the Z-axis direction. With reference to FIGS. 9 and 11 , the fifth groove portion 21 in this embodiment is a through hole, but may also be a bottomed groove, i.e., a recess. The cross section of the fifth groove portion 21 perpendicular to the Y-axis is smaller on the side closer to the first shaft portion 10 across the step portion 22.

[0038] The second opposing surface 29 is formed with a first groove portion 23 and a second groove portion 24. When viewed in the Y-axis direction, the first groove portion 23 and the second groove portion 24 are disposed symmetrically with respect to the center line C. When viewed along the Y-axis direction, the center line C is a straight line that extends along the X-axis direction and is equidistant from the first groove portion 23 and the second groove portion 24. When viewed along the Y-axis direction, the first groove portion 23 and the second groove portion 24 extend so as to move away from the center line C as they move away from the second tip portion 20A. The first groove portion 23 accommodates an area including the tip of a first protrusion portion 31C formed on the first root portion 31 of the first pivot portion 30, and guides the first protrusion portion 31C when the second shaft portion 20 slides relative to the first shaft portion 10. The second groove 24 accommodates an area including the tip of the second protrusion 41C formed on the second root portion 41 of the second pivoting portion 40, and guides the second protrusion 41C when the second shaft portion 20 slides relative to the first shaft portion 10. The wall surface defining the first groove 23 is a first drive portion that rotates the first pivoting portion 30 about the first through-hole 31A when the second shaft portion 20 slides relative to the first shaft portion 10. The wall surface defining the second groove 24 is a second drive portion that rotates the second pivoting portion 40 about the second through-hole 41A when the second shaft portion 20 slides relative to the first shaft portion 10. That is, the second shaft portion includes a wall surface that defines the first groove 23 as the first drive portion, and a wall surface that defines the second groove 24 as the second drive portion.

[0039] 1 to 3, the pin 70 extends in the Y-axis direction, passes through the first pivot portion 30 and the second pivot portion 40, and is fixed to the first shaft portion 10. More specifically, as shown in FIG. 12, the pin 70 includes a main body portion 72 having a solid cylindrical shape, and a head portion 71 that is connected to a base end portion, which is one end of the main body portion 72, and has a larger diameter than the main body portion 72. The end of the pin 70 opposite the head portion 71 (the end of the main body portion 72 opposite the end connected to the head portion 71) is a tip portion 73. The pin 70 passes through the first through hole 31A of the first pivot portion 30 and the second through hole 41A of the second pivot portion 40, and an area including the tip portion 73 is received in the first fixing hole 12 of the first shaft portion 10, thereby being fixed to the first shaft portion 10. At this time, the head 71 of the pin 70 is capable of contacting the step portion 22 in the fifth groove portion 21, and slides on the step portion 22 as the second shaft portion 20 slides relative to the first shaft portion 10. When viewed in the Y-axis direction, the pin 70, the fifth groove portion 21, the second through hole 41A, the first through hole 31A, and the first fixing hole 12 overlap with each other.

[0040] Next, the operation of the medical forceps 1 of this embodiment will be described. With reference to FIGS. 13-14 and 1-2, when the first pivoting portion 30 and the second pivoting portion 40 are closed (the state shown in FIGS. 13 and 1), the pin 70 is located in the region farthest from the second tip portion 20A within the fifth groove 21. The regions including the tips of the first protrusion 31C and the second protrusion 41C are located in the regions farthest from the second tip portion 20A within the first groove 23 and the second groove 24, respectively. Meanwhile, the regions including the tips of the third protrusion 31D and the fourth protrusion 41D are located in the regions closest to the first tip portion 10A within the third groove 13 and the fourth groove 14, respectively.

[0041] When first finger hole portion 52 and second finger hole portion 62 are opened in the direction of arrow A from this state (see FIG. 1), second shaft portion 20 slides relative to first shaft portion 10 along the X-axis toward second base end portion 20B. At this time, pin 70 fixed to first shaft portion 10 passes through first through hole 31A and second through hole 41A, so that the positions of the regions of first pivot portion 30 and second pivot portion 40 where first through hole 31A and second through hole 41A are fixed. Meanwhile, regions including the tips of first protrusion 31C and second protrusion 41C are guided by the wall surfaces defining first groove portion 23 and the wall surfaces defining second groove portion 24, respectively, and move within first groove portion 23 and second groove portion 24 toward second tip portion 20A. The regions including the tips of third protrusion 31D and fourth protrusion 41D are guided by the wall surfaces defining third groove 13 and the wall surfaces defining fourth groove 14, respectively, and move within third groove 13 and fourth groove 14 away from first tip 10A. As a result, first pivoting portion 30 and second pivoting portion 40 pivot in opposite directions about first through-hole 31A and second through-hole 41A, respectively, and first pivoting portion 30 and second pivoting portion 40 open. The position of pin 70 within fifth groove 21 approaches second tip 20A.

[0042] And in the state where the first moving part 30 and the second moving part 40 are in the most open state (the states in FIGS. 14 and 2), the pin 70 is located in the fifth groove part 21 in the region closest to the second tip part 20A. Also, the regions including the tips of the first protruding part 31C and the second protruding part 41C are respectively located in the regions closest to the second tip part 20A in the first groove part 23 and the second groove part 24. On the other hand, the regions including the tips of the third protruding part 31D and the fourth protruding part 41D are respectively located in the regions farthest from the first tip part 10A in the third groove part 13 and the fourth groove part 14. When the first finger hole part 52 and the second finger hole part 62 are closed in the direction of arrow B from this state (see FIG. 2), the first moving part 30 and the second moving part 40 rotate in the opposite direction to the above, and the first moving part 30 and the second moving part 40 close. In this way, by sliding the second shaft part 20 with respect to the first shaft part 10 by operating the first finger hole part 52 and the second finger hole part 62, the opening and closing of the first moving part 30 and the second moving part 40 can be achieved. When the distance between the first finger hole part 52 and the second finger hole part 62 is changed as described above, the trajectories of the first finger hole part 52 and the second finger hole part 62 are included in the X - Y plane. On the other hand, the plane including the trajectories of the first moving part 30 and the second moving part 40 is included in the X - Z plane. That is, the plane including the trajectories of the first finger hole part 52 and the second finger hole part 62 and the plane including the trajectories of the first moving part 30 and the second moving part 40 intersect (are orthogonal).

[0043] In the medical forceps 1 of the present embodiment, the first shaft portion 10, the second shaft portion 20, the first rotating portion 30, the second rotating portion 40, and the pin 70 are arranged as described above. When the second shaft portion 20 slides relative to the first shaft portion 10, the first rotating portion 30 and the second rotating portion 40 rotate in opposite directions around the through holes 31A and 41A through which the pin 70 passes. As a result, the rotating portions 30 and 40 can be opened and closed only by the relative sliding of the shaft portions 10 and 20. Moreover, since the two rotating portions 30 and 40 can perform a double-opening operation of rotating in opposite directions, the sliding amount of the shaft portions 10 and 20 can be minimized, and the vibration of the shaft portions 10 and 20 associated with the operation of the user sliding the shaft portions 10 and 20 can also be minimized. Thus, the medical forceps 1 of the present embodiment are medical forceps in which the movement of portions other than the rotating portions 30 and 40 arranged at the tip is small.

[0044] The medical forceps of the present disclosure can be applied as medical forceps for various uses that require small movement of portions other than the rotating portions 30 and 40 arranged at the tip. The medical forceps of the present disclosure are particularly suitable, for example, as ear forceps (ear forceps) for collecting internal tissues through a narrow ear canal.

[0045] It should be understood that the embodiments disclosed this time are illustrative in all respects and not restrictive in any way. The scope of the present invention is defined not by the above description but by the claims, and it is intended that all modifications within the meaning and scope equivalent to the claims be included.

Description of Reference Numerals

[0046] 1 Medical forceps, 10 First shaft portion, 10A First tip portion, 10B First base portion, 12 First fixing hole, 13 Third groove portion, 14 Fourth groove portion, 15 First contact surface, 16 Guide groove, 19 First opposing surface, 20 Second shaft portion, 20A Second tip portion, 20B Second base portion, 21 Fifth groove portion, 22 Step portion, 23 First groove portion, 24 Second groove portion, 25 Second contact surface, 26 Guide protrusion, 29 Second opposing surface, 30 First rotating portion, 30A Tip, 31 First base portion, 31A First through hole, 31B First thick portion, 31C First protruding portion, 31D Third protruding portion, 32 First exposed portion, 32B First notch portion, 40 Second rotating portion, 40A Tip, 41 Second base portion, 41A Second through hole, 41B Second thick portion, 41C Second protruding portion, 41D Fourth protruding portion, 42 Second exposed portion, 42B Second notch portion, 50 First holding portion, 51 Third shaft portion, 52 First finger hole portion, 60 Second holding portion, 61 Fourth shaft portion, 62 Second finger hole portion, 70 Pin, 71 Head portion, 72 Body portion, 73 Tip portion, A Arrow, B Arrow, C Center line.

Claims

1. a first shaft portion extending in a first direction, a second shaft portion extending in the first direction and disposed slidably relative to the first shaft portion in the first direction, a first base portion positioned between the first shaft portion and the second shaft portion, and a first exposed portion exposed outside the space between the first shaft portion and the second shaft portion, the first rotating portion including the first base portion and the first exposed portion; a second base portion positioned between the first shaft portion and the second shaft portion, and a second exposed portion exposed outside the space between the first shaft portion and the second shaft portion, the second rotating portion including the second base portion and the second exposed portion; a second direction that is perpendicular to the first direction and in which the first shaft portion and the second shaft portion overlap, the second direction extending through the first rotating portion and the second rotating portion, and a pin fixed to the first shaft portion; a first through hole is formed in the first base portion to penetrate the first base portion in the second direction; a second through hole is formed in the second base portion to penetrate the second base portion in the second direction; the pin penetrates the first through hole and the second through hole; the second shaft portion, a first driving portion that rotates the first rotating portion around the first through hole when the second shaft portion slides relative to the first shaft portion; a second driving portion that rotates the second rotating portion around the second through hole in a direction opposite to the first rotating portion when the second shaft portion slides relative to the first shaft portion, the second driving portion being included in the medical forceps.

2. the first base portion is disposed away from the first through hole in a third direction that is perpendicular to the first direction and the second direction, and includes a first protruding portion that protrudes in the second direction toward the second shaft portion; the second base portion is disposed away from the second through hole on the side opposite to the first protruding portion in the third direction, and includes a second protruding portion that protrudes in the second direction toward the second shaft portion; the first driving portion is formed on the second shaft portion, and is a wall surface of a first groove portion that accommodates a region including a tip of the first protruding portion and guides the first protruding portion when the second shaft portion slides relative to the first shaft portion; The second drive part is a wall surface of a second groove part that is formed in the second shaft part, accommodates a region including the tip of the second protruding part, and guides the second protruding part when the second shaft part slides relative to the first shaft part. The medical forceps according to claim 1.

3. The first base part includes a third protruding part that protrudes in a direction opposite to the first protruding part along the second direction from a region that coincides with the first protruding part when viewed in the second direction. The second base part includes a fourth protruding part that protrudes in a direction opposite to the second protruding part along the second direction from a region that coincides with the second protruding part when viewed in the second direction. On the first shaft part, a third groove part that accommodates a region including the tip of the third protruding part and guides the third protruding part when the second shaft part slides relative to the first shaft part; and a fourth groove part that accommodates a region including the tip of the fourth protruding part and guides the fourth protruding part when the second shaft part slides relative to the first shaft part are formed. The medical forceps according to claim 2.

4. When viewed along the second direction, the first groove part and the second groove part are arranged symmetrically with respect to a center line that extends along the first direction and is a straight line with equal distances from the first groove part and the second groove part. The medical forceps according to claim 2 or claim 3.

5. A fifth groove part that extends along the first direction is formed in the second shaft part. When the second shaft part slides relative to the first shaft part, a part of the pin moves in the fifth groove part in the first direction. The medical forceps according to claim 1.

6. In the first direction, the medical forceps include a first holding part connected to a first base end part that is an end part of the first shaft part on a side opposite to the side where the first rotating part and the second rotating part are arranged; and a second holding part connected to a second base end part that is an end part of the second shaft part on a side opposite to the side where the first rotating part and the second rotating part are arranged. The first holding part includes a third shaft part connected to the first shaft part; and a first finger hole part having an annular shape, which is connected to an end part of the third shaft part in a longitudinal direction of the third shaft part on a side opposite to the side where the third shaft part is connected to the first shaft part. The second holding part includes a fourth shaft part connected to the second shaft part; In the longitudinal direction of the fourth shaft portion, a second finger hole portion having an annular shape, which is connected to an end portion of the fourth shaft portion on a side opposite to the side connected to the second shaft portion, is included. The distance between the fourth shaft portion and the third shaft portion increases as the fourth shaft portion moves away from the second shaft portion. The medical forceps according to claim 1, wherein the second shaft portion slides with respect to the first shaft portion by changing the distance between the first finger hole portion and the second finger hole portion. **Claim 7** The medical forceps according to claim 6, wherein when the distance between the first finger hole portion and the second finger hole portion is changed, a plane including the trajectories of the first finger hole portion and the second finger hole portion intersects a plane including the trajectories of the first rotating portion and the second rotating portion.

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