JP6855622B1 - Medical treatment tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a medical treatment tool capable of preventing a rod on a handle side and a shaft on a transmission mechanism side from falling off. A forceps 2 includes a jaw unit 10 that is inserted into a body cavity and performs a predetermined treatment, an operation unit 20 that operates the jaw unit, and a transmission mechanism 30 that transmits the movement of the operation unit to the jaw unit. When the rod is accommodated in the rod accommodating cylinder, the distance between the side surface and the inner peripheral surface of the rod accommodating cylinder is narrower than the outer diameter of the shaft engaging piece. Therefore, when the rod is accommodated in the rod accommodating cylinder, the shaft engaging piece does not fall out from the engaging piece accommodating hole. Further, when the rod slides toward the tip end side in the X-axis direction in the rod accommodating cylinder, the distance from the base end of the retaining protrusion to the tip end of the rod accommodating cylinder is smaller than the outer diameter of the shaft engaging piece. [Selection diagram] Fig. 1

Description

The present invention relates to a medical treatment tool.

Minimally invasive surgery (eg, endoscopic surgery) has become common in all surgical fields. Forceps and the like are known as medical treatment tools used for such minimally invasive surgery (for example, Patent Document 1). Such a medical treatment tool includes a jaw that is inserted into a body cavity and can be opened and closed, a handle mechanism that operates the treatment mechanism, and a transmission mechanism that transmits the movement of the handle mechanism to the jaw.

Japanese Unexamined Patent Publication No. 6-7366

By the way, in such a medical treatment tool, the transmission mechanism and the handle mechanism can be disassembled because of the ease of assembly and disassembly. Therefore, as a mechanism for transmitting the movement of the handle mechanism to the jaw, it is necessary to detachably connect the rod of the handle mechanism and the shaft of the transmission mechanism.

On the other hand, if smoke, mist or blood is generated in the body cavity during surgery, the operator's field of view cannot be secured. Therefore, it is necessary to suck smoke, mist and blood at the tip of the treatment mechanism and the transmission mechanism and to discharge them from the handle mechanism. Therefore, it is necessary to form a flow path for smoke, mist and blood in the transmission mechanism and the handle mechanism. However, when using such a medical treatment tool, the rod on the handle side and the shaft on the transmission mechanism side come off, and the jaw cannot be operated.

As a result of diligent studies by the inventors, it was found that the dropout of the rod on the handle side and the shaft on the transmission mechanism side was caused by the connection structure between the rod and the shaft in the flow path.

In view of such circumstances, the present invention intends to provide a medical treatment tool capable of preventing the rod on the handle side and the shaft on the transmission mechanism side from falling off.

The present invention includes a treatment mechanism that is inserted into a body cavity and capable of performing a predetermined movement, an operation mechanism that operates the treatment mechanism, and a transmission mechanism that transmits the movement of the operation mechanism to the treatment mechanism. The flow passage is a treatment tool formed from at least the operation mechanism to the transmission mechanism, and the transmission mechanism includes a shaft connected to the treatment mechanism and an engaging piece provided on the base end side of the shaft. The operating mechanism includes a shaft accommodating cylinder for accommodating the shaft, a handle capable of transitioning between the first state and the second state, and a handle movable in its own length direction according to the transition of the handle. A rod, a rod accommodating cylinder accommodating the rod, and a connecting member accommodated in the rod accommodating cylinder and detachably connecting the rod and the shaft, and the connecting member is engaged with the rod. An engaging piece accommodating structure for accommodating a piece, a support structure for supporting the engaging piece accommodating structure with the rod accommodating cylinder, and the locking piece provided in the engaging piece accommodating structure are engaged in the length direction. It is provided with a retaining structure for stopping and an insertion structure in which an insertion hole for inserting the engaging piece in the external space into the engaging piece accommodating portion is formed, and the rod accommodating cylinder and the connecting member are described. When a flow passage is formed and the engaging piece accommodating structure is supported by the supporting structure, the opening of the insertion hole of the rod accommodating cylinder is wide enough to restrict the passage of the engaging piece in the insertion hole. It is characterized in that it is close to the inner wall surface or the component surface of the component provided on the rod accommodating cylinder.

According to the present invention, it is possible to provide a medical treatment tool capable of preventing the rod on the handle side and the shaft on the transmission mechanism side from falling off.

(A) is a front view of the forceps with the handle and the jaw unit closed, and (B) is a front view of the forceps with the handle and the jaw unit open. It is an exploded view which shows the outline of the forceps. It is an enlarged view of a jaw unit and its vicinity. (A) is a cross-sectional view of a connecting portion between the handle unit and the transmission mechanism when the handle and the jaw unit are in the closed state. (B) is a cross-sectional view of a connecting portion between the handle unit and the transmission mechanism when the handle and the jaw unit are in the open state. It is an enlarged view of the connection part of a handle unit and a transmission mechanism. (A) is a sectional view taken along line VV'of the rod accommodating cylinder and its peripheral parts when the handle and the jaw unit are in the closed state. (B) is a sectional view taken along line VV'of the rod accommodating cylinder and its peripheral parts when the handle and the jaw unit are in the open state. It is a VI-VI'line sectional view of a rod accommodating cylinder and a connecting member. (A) to (F) are VI-VI'line sectional views of a rod accommodating cylinder and a connecting member (modification example), respectively.

As shown in FIGS. 1 and 2, the forceps 2 are used for minimally invasive surgery and the like, and are inserted into a body cavity to perform a predetermined treatment and a jaw unit 10 (treatment mechanism) and an operation for operating the jaw unit 10. It includes a unit 20 (operation mechanism) and a transmission mechanism 30 that transmits the movement of the operation unit 20 to the jaw unit 10. The jaw unit 10 can be opened and closed by a predetermined operation by the operation unit 20.

The operation unit 20 includes a fixed handle 21, a movable handle 22, and a rotating shaft 23 that rotatably attaches the movable handle 22 to the fixed handle 21. The details of the fixed handle 21 and the movable handle 22 will be described later.

The transmission mechanism 30 includes a shaft 31, a shaft accommodating cylinder 32 accommodating the shaft 31, and a shaft engaging piece 33 formed on the base end side of the shaft 31. The shaft 31 is formed in a columnar shape and extends in the X-axis direction, and is arranged coaxially with the shaft accommodating cylinder 32. The shaft accommodating cylinder 32 is formed in a cylindrical shape and extends in the X-axis direction. On the base end side of the shaft accommodating cylinder 32, a shaft large diameter tubular portion 32D having an outer diameter larger than that of the shaft accommodating cylinder 32 is formed. The shaft engaging piece 33 engages with the fixed handle 21 and projects from the shaft 31 in the radial direction (hereinafter, referred to as the R direction) around the X axis. The shape of the shaft engaging piece 33 is not particularly limited, but is formed, for example, in a spherical shape, a rectangular parallelepiped shape, or a shaft shape.

As shown in FIGS. 2 and 3, the jaw unit 10 includes a jaw 12 that can be opened and closed, and a link mechanism 13. The jaw 12 includes jaw members 12A and 12B formed in a rod shape. Each of the jaw members 12A and 12B has a grip portion 12A (treatment portion) formed at the tip portion, a link hole formed at the base end portion, and a rotation hole formed at the intermediate portion. A jaw rotation shaft 12X is inserted through the link hole. As a result, the jaw members 12A and 12B rotate around the jaw rotation shaft 12X.

Further, the link mechanism 13 includes a box-shaped case 13K that rotatably holds the jaw rotation shaft 12X, and insertion shafts 13AA and 13BA that are inserted through the link holes at the base ends of the jaw members 12A and 12B. , The rotating pieces 13AB and 13BB rotatably provided with respect to the insertion shafts 13AA and 13BA, and the connecting shaft 13C. A connecting hole is formed at the base end of the rotating pieces 13AB and 13BB. On the other hand, a tip hole 31X is formed at the tip of the shaft 31. The connecting shaft 13C is inserted into the connecting holes of the rotating pieces 13AB and 13BB and the tip hole 31X of the shaft 31. As a result, the link mechanism 13 allows the connecting shaft 13C to move in the X-axis direction, while holding the jaw rotating shaft 12X of the jaw 12. Therefore, the link mechanism 13 can switch the advancing / retreating motion of the shaft 31 to the opening / closing motion of the jaw 12.

Next, the details of the operation unit 20 and the shaft engaging piece 33 will be described.

As shown in FIGS. 2 and 4, the fixed handle 21 includes a holding cylinder 21A which is provided in a cylindrical shape and extends in the X-axis direction, a fixed cylinder 21F housed in the holding cylinder 21A, and a rod housed in the fixed cylinder 21F. The cylinder 21T, the rod 21L accommodated in the rod accommodating cylinder 21T, the grip 21G extending in the R direction from the base end side of the holding cylinder 21A, and the connecting ring 21R attached to the tip end side of the holding cylinder 21A are connected. A cap 21C that can be attached to and detached from the ring 21R is provided.

The connecting ring 21R includes a small-diameter ring portion 21RA and a large-diameter ring portion 21RB located on the proximal end side of the small-diameter ring portion 21RA. A circular small-diameter recess 21RAX is formed on the surface of the small-diameter ring portion 21RA on the tip end side. A circular large-diameter recessed portion 21RBX equal to the outer diameter of the holding cylinder 21A is formed on the surface of the large-diameter ring portion 21RB on the base end side. By abutting the holding cylinder 21A against the large diameter recessed portion 21RBX, the connecting ring 21R is pivotally supported with respect to the holding cylinder 21A. Therefore, the connecting ring 21R is rotatable around the X axis. An urging member such as a spring or a washer may be arranged between the connecting ring 21R and the holding cylinder 21A. A male screw (not shown) is formed on the outer peripheral surface of the small diameter ring portion 21RA. The cap 21C is formed in a tubular shape, and a female screw that can be screwed with respect to the male screw of the small diameter ring portion 21RA is formed on the inner peripheral surface. When the cap 21C is screwed into the small diameter ring portion 21RA with the shaft accommodating cylinder 32 passed through the cap 21C, the shaft accommodating cylinder 32 and the connecting ring 21R are connected.

In the fixed handle 21, the fixed side rotating shaft hole 21X is formed between the holding cylinder 21A and the grip 21G so as to extend in the direction of the paper surface. On the other hand, the movable handle 22 is formed so that the movable side rotation shaft hole 22X extends in the paper surface direction (direction orthogonal to the X-axis direction). As shown in FIG. 1, by inserting the rotation shaft 23 into the fixed side rotation shaft hole 21X and the movable side rotation shaft hole 22X, the movable handle 22 is around the rotation shaft 23 with respect to the fixed handle 21. It becomes rotatable. As a result, the operation unit 20 is in a closed state in which the movable handle 22 is close to the fixed handle 21 (FIG. 1 (A)) and an open state in which the movable handle 22 is separated from the fixed handle 21 (FIG. 1 (B)). )) And can be switched freely.

As shown in FIGS. 2 and 4, the fixed cylinder 21F is formed in a cylindrical shape and extends in the X-axis direction. A female screw (not shown) is formed at the base end portion of the inner peripheral surface of the fixed cylinder 21F.

As shown in FIGS. 2 and 5, the rod accommodating cylinder 21T is formed in a cylindrical shape and extends in the X-axis direction. The rod accommodating cylinder 21T includes a main body 21TB, a large diameter portion 21TD provided at the tip end portion of the main body 21TB, and a male screw 21TJ provided at the base end portion of the main body 21TB. The outer diameter of the large diameter portion 21TD is equal to the inner diameter of the small diameter recessed portion 21RAX of the connecting ring 21R. Therefore, by inserting the rod accommodating cylinder 21T into the connecting ring 21R from the small diameter ring portion 21RA side, the connecting ring 21R is pivotally supported by the rod accommodating cylinder 21T. Therefore, the connecting ring 21R is rotatable around the X axis with respect to the rod accommodating cylinder 21T. The male screw 21TJ is screwed into a female screw (not shown) formed on the inner peripheral surface of the fixed cylinder 21F. Further, two engaging slits 21TM extending in the X-axis direction are formed on the inner peripheral surface of the large diameter portion 21TD (FIG. 6). The two engaging slits 21TM are formed at positions facing each other.

As shown in FIGS. 2 and 5, the rod 21L is formed in a columnar shape, and has a rod body 21LB extending in the X-axis direction, an engaging projection 21LK provided at the base end of the rod body 21LB, and a rod. It includes a connecting member 21LR provided at the tip of the main body 21LB and a large diameter portion 21LD provided in the middle of the rod main body 21LB. The rod 21L is arranged in the hollow portion of the rod accommodating cylinder 21T. The hollow portion of the rod accommodating cylinder 21T includes a large-diameter hole portion 21TL formed on the tip end side in the X-axis direction and a small-diameter hole portion 21TS formed on the proximal end side in the X-axis direction. The large-diameter hole portion 21TL communicates with the small-diameter hole portion 21TS. The outer diameter of the rod body 21LB is smaller than the inner diameter of the small diameter hole portion 21TS. Therefore, the rod body 21LB is movable in the X-axis direction while penetrating the rod accommodating cylinder 21T. Further, the outer diameter of the large diameter portion 21LD is substantially equal to the inner diameter of the small diameter hole portion 21TS. Therefore, the structure is such that gas or liquid does not easily leak from the gap between the outer peripheral surface of the large diameter portion 21LD and the inner peripheral surface of the rod accommodating cylinder 21T.

Further, the base end portion of the rod body 21LB and the engaging projection 21LK project toward the base end side of the holding cylinder 21A in a state where the rod body 21LB penetrates the rod accommodating cylinder 21T. The engaging projection 21LK can be inserted into the engaging hole 22K formed in the movable handle 22 from the paper surface direction of FIG. Since the engaging hole 22K is provided with a retaining mechanism, the engaging projection 21LK inserted into the engaging hole 22K is restricted from moving in the X-axis direction. Therefore, by rotating the movable handle 22 with respect to the fixed handle 21, the rod 21L can move in the X-axis direction while being housed in the rod accommodating cylinder 21T.

As shown in FIGS. 5 to 6, the connecting member 21LR is formed in a rectangular parallelepiped shape. An engaging piece accommodating hole 21LRX (engaging piece accommodating structure) in which the shaft engaging piece 33 can be accommodated is opened in the tip surface 21LRA of the connecting member 21LR in the X-axis direction. The engaging piece accommodating hole 21LRX extends in the X-axis direction. On the inner wall surface on the opening side of the engaging piece accommodating hole 21LRX, a retaining projection 21LRT (removing structure) for preventing the shaft engaging piece 33 from coming off is formed. The retaining protrusions 21LRT are formed in pairs on the inner wall of the engaging piece accommodating hole 21LRX, and each project toward the central portion of the space of the engaging piece accommodating hole 21LRX. The distance CL1 between the retaining protrusions 21LRT formed in pairs is narrower than the outer diameter R1 of the shaft engaging piece 33, while being wider than the outer diameter R2 of the shaft 31. Therefore, the shaft engaging piece 33 housed in the engaging piece accommodating hole 21LRX is restricted from moving in the X-axis direction by the retaining projection 21LRT. Further, an insertion port 21LRI (insertion structure) into which the shaft engaging piece 33 can be inserted into the engaging piece accommodating hole 21LRX is formed on the side surface 21LRC (side surface in the direction of the paper in FIG. To.

When the rod 21L is accommodated in the rod accommodating cylinder 21T (FIG. 5A), the distance CL2 between the side surface 21LRC and the inner peripheral surface 21TN of the rod accommodating cylinder 21T is narrower than the outer diameter R1 of the shaft engaging piece 33. (Fig. 6). Therefore, when the rod 21L is accommodated in the rod accommodating cylinder 21T, the shaft engaging piece 33 does not fall out from the engaging piece accommodating hole 21LRX. Further, when the rod 21L slides toward the tip end side in the X-axis direction in the rod accommodating cylinder 21T, the distance CL3 from the base end of the retaining protrusion 21LRT to the tip end of the rod accommodating cylinder 21T is the outer diameter R1 of the shaft engaging piece 33. Smaller than (Fig. 5 (B)). Thereby, the shaft engaging piece 33 can be prevented from falling off from the engaging piece accommodating hole 21LRX.

In the connecting member 21LR, the four ridge lines 21LRR extending in the X-axis direction are in contact with the inner peripheral surface 21TN of the rod accommodating cylinder 21T. Therefore, the ridge line 21LRR functions as a support structure for supporting the connecting member 21LR in the hollow portion of the rod accommodating cylinder 21T. Further, the inner peripheral surface 21TN of the rod accommodating cylinder 21T and the side surfaces 21LRC to 21LRF of the connecting member 21LR are separated from each other. Therefore, a flow passage 2RX (described later) through which gas or liquid can flow is formed between the side surfaces 21LRC to 21LRF of the connecting member 21LR and the inner peripheral surface 21TN of the rod accommodating cylinder 21T.

Further, the forceps 2 are formed with a flow passage 2RX through which gas or liquid can flow. The inlet of the flow passage 2RX is a suction hole 32RX formed on the tip end side of the shaft accommodating cylinder 32 (FIG. 3). The suction holes 32RX are preferably formed in the R direction at a predetermined pitch on the peripheral surface of the shaft accommodating cylinder 32.

The flow passage 2RX in the transmission mechanism 30 is a gap between the shaft accommodating cylinder 32 and the shaft 31 (FIGS. 3 to 4), and in the operation unit 20, the inner peripheral surface 21TN of the rod accommodating cylinder 21T and the side surface of the connecting member 21LR. It is a gap between 21LRC and 21LRF (FIGS. 5 to 6). The outlets of the flow passage 2RX are the storage cylinder side communication hole 21TR (FIG. 2) formed in the middle part of the rod storage cylinder 21T in the X-axis direction and the fixed cylinder side communication formed in the middle part of the fixed cylinder 21F in the X-axis direction. It is formed of a hole 21FR (FIG. 2) and a holding cylinder side communication hole 21AR (FIG. 2) formed in the middle portion of the holding cylinder 21A in the X-axis direction. The accommodating cylinder side communication hole 21TR communicates with the gap between the side surface 21LRC to 21LRF of the connecting member 21LR and the inner peripheral surface 21TN of the rod accommodating cylinder 21T (FIGS. 4 to 5). The accommodating cylinder side communication hole 21TR, the fixed cylinder side communication hole 21FR, and the holding cylinder side communication hole 21AR communicate with each other (FIG. 4). As shown in FIG. 2, the tip of the suction pipe 2RP is inserted into the accommodating cylinder side communication hole 21TR, the fixed cylinder side communication hole 21FR, and the holding cylinder side communication hole 21AR. A suction device (not shown) is connected to the base end of the suction pipe 2RP via a tube (not shown).

Here, each component of the jaw unit 10 and the transmission mechanism 30 is preferably formed of metal (for example, stainless steel). Further, among the fixed handles 21, the holding cylinder 21A, the grip 21G, the connecting ring 21R, and the removable cap 21C are preferably formed of synthetic resin. Other parts are preferably made of metal (eg, stainless steel). The movable handle 22 is preferably formed of a synthetic resin.

Next, a method of assembling the forceps 2 will be described.

As shown in FIGS. 2 and 4, the holding cylinder 21A and the grip 21G are formed around the fixed cylinder 21F. Next, when the holding cylinder 21A of the fixed handle 21 is brought into contact with the large-diameter recessed portion 21RBX of the connecting ring 21R, the connecting ring 21R is pivotally supported with respect to the holding cylinder 21A. Therefore, the connecting ring 21R is rotatable around the X axis. The base end side of the rod accommodating cylinder 21T is inserted into the hollow portion of the fixed cylinder 21F via the hollow portion of the connecting ring 21R. The rod accommodating cylinder 21T can be attached to the fixed cylinder 21F by turning a tool such as a flat-blade screwdriver in a state of being engaged with the engaging slit 21TM. As a result, the large-diameter portion 21TD of the rod accommodating cylinder 21T comes into contact with the small-diameter recessed portion 21RAX of the connecting ring 21R. In this way, the connecting ring 21R is rotatably attached to the fixed handle 21 by the rod accommodating cylinder 21T. Next, when the rod 21L is inserted into the rod accommodating cylinder 21T, the large diameter portion 21LD is located in the small diameter hole portion 21TS, and the engaging projection 21LK moves from the small diameter hole portion 21TS to the base end side in the X-axis direction. Protrude. At this time, the connecting member 21LR protrudes from the large-diameter hole portion 21TL toward the tip end side in the X-axis direction, and the insertion port 21LRI is exposed to the external space.

As shown in FIGS. 2 and 3, the connecting shaft 13C is inserted through the base end portions of the rotating pieces 13AB and 13BB of the jaw unit 10 and the tip hole 31X of the shaft 31. As a result, the shaft 31 is connected to the jaw unit 10. Next, the cap 21C and the shaft accommodating cylinder 32 are passed in this order from the base end side of the shaft 31. Next, the shaft engaging piece 33 of the shaft 31 is passed through the insertion port 21LRI of the connecting member 21LR. As a result, the shaft engaging piece 33 is located in the engaging piece accommodating hole 21LRX. At this time, the shaft engaging piece 33 housed in the engaging piece accommodating hole 21LRX is restricted from moving in the X-axis direction by the retaining projections 21LRT formed in pairs. As a result, the shaft 31 is connected to the rod 21L.

The shaft large-diameter tubular portion 32D is brought into contact with the small-diameter ring portion 21RA. When the cap 21C is screwed into the small diameter ring portion 21RA with the shaft accommodating cylinder 32 passed through the cap 21C, the shaft accommodating cylinder 32 and the connecting ring 21R are connected to each other.

The engaging protrusion 21LK is inserted into the engaging hole 22K (FIG. 2) of the movable handle 22 from the direction of the paper surface of FIG. Next, the rotating shaft 23 is inserted into the fixed-side rotating shaft hole 21X of the fixed handle 21 and the movable-side rotating shaft hole 22X of the movable handle 22. As a result, the movable handle 22 becomes rotatable around the rotation shaft 23 with respect to the fixed handle 21.

Finally, as shown in FIG. 2, the tip of the suction pipe 2RP is fitted into the accommodating cylinder side communication hole 21TR and the holding cylinder side communication hole 21AR. In this way, the forceps 2 are assembled.

Next, how to use the forceps 2 will be described.

The operation unit 20 has a closed state in which the movable handle 22 is close to the fixed handle 21 (FIG. 1 (A)) and an open state in which the movable handle 22 is separated from the fixed handle 21 (FIG. 1 (B)). Can be switched between. When the operation unit 20 is in the closed state, the fixed handle 21 and the rod accommodating cylinder 21T are relatively separated from each other (FIG. 5 (A)), but when the operation unit 20 is in the open state, the fixed handle 21 and the rod accommodating cylinder 21 It approaches 21T. In this way, the rod 21L moves forward and backward in the X-axis direction as the operation unit 20 opens and closes. The advancing / retreating motion of the rod 21L in the X-axis direction is transmitted to the advancing / retreating motion of the shaft 31 in the X-axis direction by the connecting member 21LR. Since the shaft 31 is connected to the jaw members 12A and 12B via the rotating pieces 13AB and 13BB and the connecting shaft 13C, the forward / backward movement of the shaft 31 in the X-axis direction is performed via the link mechanism 13. Then, the jaw 12 is opened and closed.

Next, a suction device (not shown) is connected to the base end of the suction pipe 2RP via a tube (not shown). The jaw unit 10 side of the forceps 2 is inserted into the body cavity of the patient, and the handle unit is operated at a predetermined position. At this time, if smoke, mist or blood is generated in the body cavity, the suction function of the suction device is turned on. The forceps 2 is formed with a flow passage 2RX through which gas or liquid can flow, and a suction hole 32RX serving as an inlet thereof is provided at the tip of the shaft accommodating cylinder 32. Therefore, smoke, mist, blood, etc. in the vicinity of the jaw unit 10 can be sucked from the suction hole 32RX and discharged from the suction pipe 2RP to the suction device via the flow passage 2RX.

In the connecting member 21LR, the four ridge lines 21LRR extending in the X-axis direction are in contact with the inner peripheral surface 21TN of the rod accommodating cylinder 21T, and the side surface 21LRC of the connecting member 21LR on which the insertion port 21LRI is formed is , The rod accommodating cylinder 21T is close to the inner peripheral surface 21TN, and the distance CL2 is narrower than the outer diameter R1 of the shaft engaging piece 33 (FIG. 6). Therefore, the shaft engaging piece 33 does not have to fall out from the engaging piece accommodating hole 21LRX.

In the above embodiment, the connecting member 21LR is positioned in the rod accommodating cylinder 21T by bringing the four ridge lines 21LRR in the connecting member 21LR into contact with the inner peripheral surface 21TN of the rod accommodating cylinder 21T. The insertion port 21LRI may be close to the rod accommodating cylinder 21T so that the shaft engaging piece 33 does not fall out of the engaging piece accommodating hole 21LRX.

For example, as shown in FIG. 7A, the side surface 21LRC of the connecting member 21LR may be a curved surface instead of a flat surface. The connecting member 21LR having such a shape leaves the side surface 21LRC having the insertion port 21LRI in a cylindrical body whose outer diameter is equal to the inner diameter of the rod accommodating cylinder 21T, and the other peripheral portions are the side surfaces 21LRD to 21LRF, respectively. You may cut it. Further, as shown in FIG. 7B, in the cylindrical body, the side surface 21LRC having the insertion port 21LRI and the opposite side surface 21LRD are left as curved surfaces, and the other peripheral portions are the side surfaces 21LRE to 21LRF, respectively. You may cut it.

That is, in the positioning of the connecting member 21LR in the rod accommodating cylinder 21T, the portion where the connecting member 21LR abuts on the rod accommodating cylinder 21T without abutting the four ridge lines 21LRR on the inner peripheral surface 21TN of the rod accommodating cylinder 21T ( There may be at least three places as the support structure). For example, two abutting portions (support structure) are located on both sides of the insertion port 21LRI, and the third abutting portion (support structure) is on the opposite side of the insertion port 21LRI with reference to the axis of the rod accommodating cylinder 21T. It is preferably located at. If there are three such abutting portions (support structures), the connecting member 21LR can be positioned in the rod accommodating cylinder 21T. For example, as shown in FIG. 7C, in the cylindrical body, the side surface 21LRC having the insertion port 21LRI may be left as a curved surface, and the other peripheral portions may be cut so as to be the side surfaces 21LRE to 21LRF, respectively. In FIG. 7C, the ridge line 21LRR formed by the side surfaces 21LRE to 21LRF abuts on the inner peripheral surface 21TN of the rod accommodating cylinder 21T, that is, the ridge line 21LRR functions as a support structure for positioning the connecting member 21LR in the rod accommodating cylinder 21T. ..

Further, in positioning the connecting member 21LR in the rod accommodating cylinder 21T, the connecting member 21LR does not have to be in direct contact with the rod accommodating cylinder 21T. For example, as shown in FIG. 7 (D), instead of separating the side surface 21 LRD from the rod accommodating cylinder 21T, a cylinder side support ridge 21 SP for supporting the side surface 21 LRD may be provided on the inner peripheral surface of the rod accommodating cylinder 21T. .. Further, as shown in FIG. 7 (E), four cylinder-side support ridges 21SP for supporting the four ridge lines 21LRR may be provided on the inner peripheral surface of the rod accommodating cylinder 21T. The cylinder-side support ridge 21SP extends in the X-axis direction and is formed at a predetermined pitch in the circumferential direction. Further, a groove 21 SPM having a shape that can be fitted to the ridge line 21 LRR is formed at the tip of the cylinder-side support ridge 21 SP.

Further, in the above embodiment, the flow passage 2RX is formed in the gap between the rod accommodating cylinder 21T and the connecting member 21LR, but the present invention is not limited to this, and as shown in FIG. 7 (F), the rod accommodating cylinder 21T A distribution groove 21TT may be provided on the inner peripheral surface, and the distribution groove 21TT may be used as a flow passage 2RX.

In the above embodiment, the suction hole 32RX of the flow passage 2RX is formed in the shaft accommodating cylinder 32, but the present invention is not limited to this, and the suction hole of the flow passage 2RX may be provided in the jaw unit 10. In this case, the groove 12AM and the groove 12BM are formed in the movable pieces 12A and 12B constituting the jaw 12. When the jaw 12 is closed, the groove 12AM and the groove 12BM function as an integral suction hole. Further, the gas sucked from the suction hole may be sucked through the opening on the tip end side of the shaft accommodating cylinder 32.

When the rod 21L slides toward the tip end side in the X-axis direction in the rod accommodating cylinder 21T, the base end of the retaining projection 21LRT preferably stays in the rod accommodating cylinder 21T. As a result, the shaft engaging piece 33 can be reliably prevented from falling out of the engaging piece accommodating hole 21LRX.

In the operation unit 20, the movable handle 22 is movable in the X-axis direction with respect to the fixed handle 21, and the movable handle 22 is separated from the fixed handle 21 in a closed state in which the movable handle 22 is close to each other. It may be possible to switch between the open state and the open state.

The suction holes 32RX may be formed in the X direction at a predetermined pitch on the peripheral surface of the shaft accommodating cylinder 32.

In the above embodiment, the forceps 2 has been described as an example of the treatment tool, but the treatment tool of the present invention is not limited to the forceps, and can be used for other treatment tools such as a needle holder, a retractor, and scissors.

It should be noted that the present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

2 Forceps 2RP Suction pipe 2RX Flow passage 10 Jaw unit 12 Jaw 13 Link mechanism 20 Operation unit 21 Fixed handle 21A Holding cylinder 21L Rod 21LR Connecting member 21LRI Insertion port 21LRR Ridge line 21LRT Retracting protrusion 21LRX Engagement piece accommodating hole 21R Connecting ring 21SP Cylinder side Support Prop Engagement piece

Claims (5)

A treatment mechanism that is inserted into the body cavity and allows for predetermined movement,
An operation mechanism for operating the treatment mechanism and
A transmission mechanism that transmits the movement of the operation mechanism to the treatment mechanism is provided.
A treatment tool in which a gas or liquid flow path is formed from at least the operation mechanism to the transmission mechanism.
The transmission mechanism is
A shaft connected to the treatment mechanism and
With the engaging piece provided on the base end side of the shaft,
A shaft accommodating cylinder for accommodating the shaft is provided.
The operation mechanism is
A handle that can transition between the first and second states,
A rod that can move in its own length direction according to the transition of the handle,
A rod accommodating cylinder for accommodating the rod and
A connecting member that is housed in the rod accommodating cylinder and that detachably connects the rod and the shaft is provided.
The connecting member
Engaging piece housing structure housing said engaging piece,
A retaining structure provided in the engaging piece accommodating structure and locking the engaging piece in the length direction,
An insertion structure having an insertion hole for inserting the engagement piece in the external space into the engagement piece accommodating structure is provided.

A support structure provided on the connecting member and supporting the connecting member with the rod accommodating cylinder is provided.
The flow passage is formed between the rod accommodating cylinder and the connecting member.
When the connecting member is supported by the support structure, the extent to regulate the passage of the engaging piece in the insertion hole, that the opening of the insertion hole, close against the inner wall surface of the rod holding cylinder A characteristic medical treatment tool. And the inner wall surface of the rod holding cylinder, the opening of the insertion hole, the spacing, a medical treatment tool according to claim 1, wherein the narrower than the dimension of the engaging piece. The support structure includes a first support portion, a second support portion, and a third support portion arranged around the axis of the rod.
The insertion hole is opened between the first support portion and the second support portion, and the insertion hole is opened.
The medical treatment tool according to claim 1 or 2, wherein the third support portion is located on the side opposite to the insertion hole with respect to the axis of the rod. A groove is formed on the inner wall surface of the rod accommodating cylinder.
The medical treatment tool according to claim 1 or 2, wherein the groove forms a part of the flow path. The inlet of the flow passage is provided in the transmission mechanism or the treatment mechanism.
The medical treatment tool according to any one of claims 1 to 4, wherein the outlet of the flow passage is provided in the operation mechanism.

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