JP6636816B2 - Operating force transmitting mechanism for surgical forceps and surgical forceps provided with the operating force transmitting mechanism - Google Patents

Description

  The present invention relates to a surgical forceps used in an endoscopic operation.

  Endoscopic surgery is minimally invasive and is rapidly spreading to medical practice as a technique for reducing the physical burden on patients. Endoscopic surgery is generally performed by making four or five holes in the abdomen, inserting a trocar, inserting a laparoscope or surgical instrument, and injecting gas into the abdominal cavity to inflate the body tissue. This is a surgical method that performs treatment on the patient. Therefore, the surgical forceps used in the endoscopic surgery includes a shaft portion having a jaw openable and closable at a distal end and inserted into a trocar, and a handle portion to which the proximal end side of the shaft portion is attached to open and close the jaw. It is comprised including. The jaws have various forms based on the functions of the forceps such as grasping forceps for grasping a living tissue and a peeling forceps for peeling off an adhesion portion, and a surgical forceps provided with a jaw of an appropriate form according to the operation content is used. Can be

  Here, the handle portion has a fixed handle and a swing handle that is swingably attached to the fixed handle. Generally, a scissor-type handle operated with the thumb and the middle finger (or the index finger) is widely used. I have. The shaft portion includes a pipe having a jaw openably and closably attached to a tip thereof, and a rod having one end connected to the jaw and the other end inserted through the inside of the pipe and locked to a swing handle. Then, when the operator operates the swing handle to open and close, the operating force on the swing handle is transmitted to the jaw via the rod, and the jaw opens and closes in accordance with the operator's opening and closing operation ( See, for example, Patent Documents 1 and 2.

JP-A-5-285149 JP 2010-207263 A

  In the conventional surgical forceps as described above, when the operator opens and closes the handle, the operating force of the operator is directly transmitted to the jaws via the rod. In such an operation force transmission structure, when a surgeon closes the handle portion and the jaw closes, when the portion contacted by the jaw is a hard material such as bone, metal, or ceramic, the There is a problem that a shock load may be applied to the part. Further, as a reaction force, a shocking force sometimes acts on an operator operating the handle portion.

  The present invention has been made in view of the above-described circumstances, and suppresses an impact load on a portion where a jaw abuts, and reduces the burden on an operator, and transmits operating force of a surgical forceps. It is an object of the present invention to provide a mechanism and a surgical forceps including the operation force transmission mechanism.

The embodiment exemplifying the present invention is provided with a handle portion having a fixed handle and a swinging handle, which is opened and closed by an operator, and a jaw provided with the base end portion attached to the handle portion, extending forward and opening and closing at the tip end portion. An operating force transmission mechanism for operating forceps including a shaft portion. The shaft portion includes a pipe extending back and forth, a jaw openably and closably attached to a tip end of the pipe, and one end connected to the jaw, and the other end inserted into the pipe and locked by the swing handle, to the swing handle. And a rod for transmitting an operating force to the jaw. A plug member for inserting the pipe and the rod back and forth at the base end of the shaft portion, a connector member for supporting the pipe so as to be slidable back and forth and inserting the rod back and forth, and between the plug member and the connector member. The first elastic member 53 (e.g., the first elastic member 53 in the embodiment) and the connector member are slidably supported back and forth, and are urged in a direction to separate the plug member and the connector member. A body member that integrally holds the plug member, the elastic member, and the connector member. Then, the pipe is fixed to the plug member, and the connector member is fixed to the fixed handle to form an operating force transmitting mechanism of the surgical forceps.

  Further, it is preferable that the pipe is supported by the connector member so as to be slidable back and forth through the plug member and the connector member.

Further, the connector member is supported by the body member so as to be slidable back and forth and rotatable around the axis of the pipe, and the body member includes a knob member for rotating the body member about the axis of the pipe. Preferably, it is provided.

  Preferably, a second elastic member (for example, the second elastic member 57 in the embodiment) is provided between the body member or the knob member and the fixed handle. Preferably, the body member and the plug member are formed using a metal material, and at least one of the elastic member and the second elastic member is formed using a resin material.

  Another embodiment that exemplifies the present invention is a surgical forceps including the operating force transmission mechanism described above.

In the operating force transmitting mechanism according to the aspect of the present invention, a plug member for inserting a pipe and a rod into the base end of the shaft portion, a connector member for supporting the pipe so as to be slidable back and forth, and inserting the rod back and forth , An elastic member disposed between the plug member and the connector member; and a plug member and an elastic member that support the connector member so as to be slidable back and forth and are urged in a direction to separate the plug member and the connector member. A body member that integrally holds the member and the connector member is provided. The pipe is fixed to the plug member, and the connector member is fixed to the fixed handle. When the operator closes the handle, the operating force of the operator is transmitted from the swing handle to the jaw via the rod, and the jaw swings in the closing direction. When the jaw is in contact with a hard object such as a bone, metal, ceramic, or the like and is pinched, the jaw cannot further swing in the closing direction, and thereafter, the operating force to swing the jaw in the closing direction (acting from the rod to the jaw) Operating force) is transmitted to the pipe. At this time, in the operating force transmission mechanism of the aspect of the present invention, the elastic member is provided between the plug member to which the pipe is fixed and the connector member to which the pipe is fixed. After the jaws are brought into contact with and sandwiched by the hard object, when an operating force for swinging the jaws in the closing direction is further applied, the elastic member is elastically deformed and receives the operating force. Therefore, the impact load on the portion where the jaw abuts can be suppressed, and the burden on the operator can be reduced.

Also , a plug member, a connector member, and a body member that integrally holds the elastic member are provided. The plug member is fixed to the body member, and the connector member is supported by the body member so as to be slidable back and forth. At the base end of the member, a structure for realizing the above functions is formed as an integral structure. Thus, it is possible to provide an operation force transmitting mechanism for surgical forceps having high long-term reliability.

Further, since the configuration in which the plug member and the connector member are integrally held in the body member in a state of being urged in the direction away by the elastic member, usability provides the operating force transmission mechanism better surgical forceps be able to.

According to the configuration in which the pipe is inserted through the plug member and the connector member so as to be slidable back and forth by the connector member, the pipe member is inserted not only through the plug member but also through the connector member fixed to the fixed handle. As a result, it is possible to provide an operation force transmitting mechanism of a surgical forceps having good operability without shaking the shaft portion while having the above-described functions and effects.

Further , the plug member is supported by the body member so as to be slidable back and forth and rotatably around the axis of the pipe extending back and forth, and the body member is provided with a knob member for rotating the body member around the pipe axis. According to the configuration, it is possible to provide an operation force transmitting mechanism of a surgical forceps having a simple configuration, having the above-described functions and effects, and capable of rotating the jaw at an end to an arbitrary angular position.

  Further, according to the configuration in which the second elastic member is provided between the body member or the knob member and the fixed handle, the jaw is further swung in the closing direction after the jaw comes into contact with the hard object and is clamped. When an operating force to move is applied, the operating force is received by the two elastic members. Therefore, it is possible to provide an operation force transmission mechanism that can further reduce an impact load on a portion where the jaw abuts and a burden on an operator, and further enhance the damage prevention effect. In addition, according to the configuration in which the body member and the plug member are formed of a metal material, and at least one of the elastic member and the second elastic member is formed of a resin material, the jaw grips the hard object with a strong operation force. In this state, the knob member can be rotated with a relatively light operation force, and an operation force transmission mechanism with good operability can be provided.

  According to the surgical forceps provided with any one of the operating force transmitting mechanisms described above, a surgical forceps that suppresses an impact load on a portion where the jaw abuts and reduces the burden on the operator is provided. can do.

It is a schematic diagram of a surgical forceps provided with an operation force transmission mechanism. It is sectional drawing of a shaft part front-end | tip. It is sectional drawing of the base end side of a shaft part, and its vicinity. It is sectional drawing of the operation force transmission assembly in an operation force transmission mechanism. It is an explanatory view for explaining an operation of an operation force transmission mechanism.

  Hereinafter, embodiments for carrying out the present invention will be described. FIG. 1 is a schematic view of a surgical forceps 1 illustrating an embodiment of the present invention, FIG. 2 is a cross-sectional view of the distal end of a shaft portion 20, and FIG. Shown in First, a schematic configuration of the surgical forceps 1 will be described with reference to these drawings. In this specification, the distal end side (left side in each drawing) of the shaft portion 20 provided with the jaw 22 is referred to as the front side, and the proximal end side of the shaft portion 20 connected to the handle portion 10 (same as the right side). ) Will be described as the rear.

  The surgical forceps 1 is roughly composed of a handle portion 10 that is opened and closed by an operator, and a shaft portion 20 whose base end is attached to the handle portion 10 and extends forward.

  The handle portion 10 is mainly composed of a fixed handle 11 and a swing handle 12 pivotally connected to the fixed handle 11 via a connecting pin 15 so as to be swingable back and forth. In the present embodiment, a so-called scissor-type handle portion 10 is shown as an example of the handle portion, and a form in which a finger hole through which an operator passes a finger is formed in the fixed handle 11 and the swing handle 12 is illustrated. The fixed handle 11 and the swing handle 12 are formed by processing a metal material such as a stainless alloy, pure titanium, or a titanium alloy.

  The shaft portion 20 includes a hollow cylindrical pipe 21 extending back and forth, a jaw 22 attached to the tip of the pipe 21 so as to be openable and closable, and a rod having one end connected to the jaw 22 and the other end inserted through the inside of the pipe 21. 23, and a rotation knob 25 provided on the base end side of the pipe 21. The rotation knob 25 is provided with an operation force transmission mechanism 50 described later in detail.

  The pipe 21 has a thin cylindrical shape having an outer diameter of about 2 to 6 mm, a thickness of about 0.2 to 0.8 mm, and a length of about 150 to 350 mm, and has a base end extending rearward from the rotation knob 25. It is arranged inside the fixed handle 11. The pipe 21 is formed using a metal pipe such as pure titanium, a titanium alloy, a stainless steel alloy, or a resin pipe such as CFRP.

  The jaw 22 is mainly composed of a first jaw member 22a and a second jaw member 22b pivotally connected to the first jaw member 22a via a pivot pin 24. Each drawing illustrates a configuration in which the first jaw member 22a is fixed to the front end of the pipe 21 to be a fixed jaw, and the second jaw member 22b is a swing jaw that swings with respect to the first jaw member 22a. . The base end of the second jaw member 22b is pivotally connected to the rod 23 via a link pin 26. Therefore, when the rod 23 moves forward, the second jaw member 22b swings clockwise relative to the first jaw member 22a to open the jaw 22, and when the rod 23 moves backward, the first jaw member 22a On the other hand, the second jaw member 22b swings counterclockwise to close the jaw 22. The first jaw member 22a and the second jaw member 22b are formed by cutting a block made of the same metal material as the pipe 21.

  The rod 23 is supported inside the pipe 21 so as to be slidable back and forth. The rod 23 has a distal end pivotally connected to the second jaw member 22 b by a link pin 26, and a proximal end projects rearward from a rear end of the pipe 21. Is arranged. At the rear end of the rod 23, an engagement body 27 having a spherical portion that engages with the engagement receiving portion 17 of the swing handle 12 is fixed. The rod 23 is formed by processing a metal wire such as a stainless alloy having a thickness of about φ1 to 2 mm.

  The fixed handle 11 accommodates and holds the rear end of the pipe 21 (and the connector member 52 of the operating force transmission mechanism 50 described later) in the shaft portion 20 and also inserts the rear end of the rod 23 through the shaft. A hole 13 is formed. The swing handle 12 is formed with a concave groove-shaped engagement receiving portion 17 that receives and engages the spherical portion of the engagement body 27.

  When the shaft portion 20 is attached to the handle portion 10, the rear end of the pipe 21 (and the connector member 52) of the shaft portion 20 is held and held in the shaft mounting hole 13, and the rear end of the rod 23 is connected to the shaft mounting hole 13. It penetrates and protrudes from the fixed handle 11, and the engagement body 27 at the rear end engages with the engagement receiving portion 17 of the swing handle 12.

  Therefore, when the swing handle 12 is swung clockwise with respect to the closing direction of the handle portion 10, that is, the swing handle 12 with respect to the fixed handle 11, the operation force is applied via the engagement portion between the engagement receiving portion 17 and the engagement body 27. Acting on the rod 23, the rod 23 slides backward. When the rod 23 slides rearward, the operating force acts on the second jaw member 22b via the link pin 26, and the jaw 22 swings in the closing direction, that is, the second jaw member 22b counterclockwise. Contrary to the above, when the handle portion 10 is opened, that is, when the swing handle 12 is swung counterclockwise, the operating force is applied to the rod 23 via the engagement portion between the engagement receiving portion 17 and the engagement body 27. Acting, the rod 23 slides forward. The operating force is transmitted to the second jaw member 22b via the link pin 26, and the jaw 22 swings clockwise in the opening direction, that is, the second jaw member 22b.

  In the surgical forceps 1 configured as above, the operation force transmission mechanism 50 is provided on the rotation knob 25 provided on the base end side of the shaft portion 20.

  The operating force transmission mechanism 50 is formed mainly of a plug member 51, a connector member 52, and a first elastic member 53 disposed between the plug member 51 and the connector member 52. In the present embodiment, a body member 54 that integrally holds a plug member 51, a connector member 52, and a first elastic member 53 is provided, and a main part of an operation force transmission mechanism 50 is configured as an integral operation force transmission assembly 55. Is exemplified. FIG. 4 is a cross-sectional view of the operating force transmission assembly 55.

  The plug member 51 as a whole has a cylindrical shape having a tapered portion having a gradually changing outer diameter at the front end, and a pipe insertion hole 51a for inserting the pipe 21 back and forth is formed at the center. The connector member 52 has a three-stage cylindrical shape having an outer diameter of a large diameter portion, a middle diameter portion, and a small diameter portion from the front, and a pipe insertion hole 52a through which the pipe 21 is inserted back and forth is formed at the center. The body member 54 has a cylindrical shape having a tapered portion having a gradually changing outer diameter at the front end, and a through hole 54a formed through the center of the body member in the front-rear direction has a large diameter portion at the front and a small diameter portion at the rear. It is a two-step hole. The plug member 51, the connector member 52, and the body member 54 are formed using a metal material such as pure titanium, a titanium alloy, and a stainless steel alloy, similarly to the pipe 21.

  Here, the outer diameter of the plug member 51 is set slightly smaller than the inner diameter of the large diameter portion of the through hole 54a of the body member. As for the outer diameter of the connector member 52, the outer diameter of the large-diameter portion at the front end is somewhat smaller than the inner diameter of the large-diameter portion of the through-hole 54a of the body member, and the outer diameter of the middle-diameter portion of the central portion is smaller than that of the small-diameter portion of the through-hole 54a. It is set slightly smaller than the inner diameter. The pipe insertion hole 51a of the plug member and the pipe insertion hole 52a of the connector member are both set slightly larger than the outer diameter of the pipe 21. In other words, the plug member 51 is fitted in the large diameter portion of the through hole 54a of the body member, and the connector member 52 is set so that the middle diameter portion is pivotally supported by the small diameter portion of the through hole 54a of the body member. Have been. The pipe 21 is set so as to be pivotally supported by the pipe insertion hole 51a of the plug member and the pipe insertion hole 52a of the connector member.

  The first elastic member 53 of the present embodiment is a member that is sandwiched between the plug member 51 and the connector member 52 and generates an urging force in a direction in which both are separated from each other. As the first elastic member 53, various metal elastic bodies such as a single or plural spring washers, a disc spring, a wave washer, a coil spring, and a coupling type spring such as a bellows type or a slit type can be used. . Further, an elastic body made of a resin such as a cylindrical rubber or an O-ring may be used. In the present embodiment, a configuration to which a spring washer made of a stainless alloy is applied will be exemplified.

  The plug member 51, the connector member 52, the first elastic member 53, and the body member 54 are integrated as follows. The connector member 52 and the first elastic member 53 are inserted into the through holes of the body member 54, and the plug member 51 is fitted. The first elastic member 53 is elastically deformed by a predetermined amount by pressing the plug member 51, and the plug member 51 is fixed to the body member 54 in that state. Thereby, the plug member 51, the connector member 52, and the first elastic member 53 are integrally held by the body member 54, and the operation force transmission assembly 55 is formed. The urging force generated by the first elastic member 53 at this time is referred to as an initial urging force in this specification. As a method of fixing the plug member 51 to the body member 54, for example, a fixing means such as welding, brazing, bonding, or the like, or a fixing means such as a set screw or a pin can be used.

  The pipe 21 on which the jaw 22 and the rod 23 are assembled is inserted into the pipe insertion holes 51a and 52a of the operating force transmission assembly 55 thus formed. Then, with the rear end of the pipe 21 protruding from the rear end of the connector member 52 by a predetermined amount, the pipe 21 is fixed to the plug member 51 by fixing means such as welding, brazing, or bonding. Then, the rotation knob 25 is formed by fixing the knob member 56 to the outer periphery of the body member 54.

  The knob member 56 is formed into a shape that allows an operator to easily perform a rotating operation by putting a finger on the outer peripheral portion of the knob member 56, and is formed by using a resin material such as a fluororesin, polyethylene, or polyimide. As a method of fixing the knob member 56 to the outer periphery of the body member 54, for example, a fixing unit that performs knurling on the outer periphery of the body member 54 and press-fits the body member 54 into the knob member 56 is exemplified. The second elastic member 57 can be formed by using a resin material such as a fluororesin, a high-molecular polyethylene resin, a silicon resin, butyl rubber, and ethylene / propylene rubber (EPDM) in an annular shape. Further, the second elastic member 57 may be made of the same metal elastic body as the first elastic member 53. In the present embodiment, a configuration in which a plate material made of fluororesin is formed in an annular shape and fixed to the rear end of the body member 54 is exemplified.

  In the illustrated rotation knob 25, the pipe 21 and the knob member 56 are integrally connected via the plug member 51 and the body member 54, and the connector member 52 is urged rearward by the first elastic member 53. The member 54 is supported so as to be slidable back and forth and rotatable around the axis of the pipe 21 extending back and forth. Then, by attaching the second elastic member 57 to the rear end side of the body member 54, the shaft portion 20 is configured.

  The shaft mounting hole 13 formed in the fixed handle 11 is a stepped hole having an inner diameter of two steps. The large diameter portion at the front is slightly larger than the outer diameter of the small diameter portion of the connector member 52, and the small diameter at the rear. The portion is set slightly larger than the outer diameter of the pipe 21 and the engaging body 27 at the rear end of the rod. The depth of the large diameter portion of the shaft mounting hole 13 is fixed when the base end side of the shaft portion 20 is fitted into the shaft mounting hole 13 and the rear end of the connector member 52 abuts against the bottom of the large diameter portion. It is set so that a predetermined gap is formed between the front end surface of the handle 11 and the rear end surface of the second elastic member 57. The position of the body member 54 in the front-rear direction with respect to the fixed handle 11 at this time is referred to as an initial position, and the interval (gap) between the front end surface of the fixed handle 11 and the rear end surface of the second elastic member 57 is referred to as an initial interval.

  A cleaning liquid circulation hole 14 is formed to communicate with the large diameter portion of the shaft mounting hole 13 and to distribute the cleaning liquid, and a cleaning liquid connection port 18 is attached here. A female screw is formed so as to communicate with the large diameter portion of the shaft mounting hole 13, and a set screw 16 for fixing the connector member 52 is screwed into the female screw. A cleaning liquid flow hole for flowing the cleaning liquid is also formed in the connector member 52 and the pipe 21 in alignment with the cleaning liquid flow hole 14 (see FIGS. 2 and 4), and a tube is connected to the cleaning liquid connection port 18. Then, the inside of the shaft portion 20 can be cleaned by flowing the cleaning liquid.

  The surgical forceps 1 is configured by connecting and fixing the shaft portion 20 configured as described above and the handle portion 10. That is, the connector member 52 and the engaging body 27 projecting rearward from the rotation knob 25 are inserted into the shaft mounting hole 13 of the fixed handle 11, and the rear end of the connector member 52 contacts the bottom surface of the large diameter portion of the shaft mounting hole 13. In the contact state, the connector member 52 is fixed by the set screw 16. Then, the engagement receiving portion 17 of the swing handle 12 is engaged with the spherical portion of the engagement body 27 projecting rearward from the shaft mounting hole 13, and the fixed handle 11 and the swing handle 12 are connected by the connection pin 15.

  In the surgical forceps 1 assembled in this manner, the pipe 21 and the knob member 56 are integrally connected via the plug member 51 and the body member 54, and the connector member 52 is pressed by the first elastic member 53 with the initial urging force. In the pressed state, it is supported by the body member 54 so as to be rotatable around the axis of the pipe 21. For this reason, the shaft portion 20 does not rotate against the surgeon's will, and the jaw 22 at the distal end of the shaft portion is moved to the desired angular position by rotating the knob member 56 with a finger. Can be adjusted.

  Further, after the pipe 21 is fixed to the plug member 51 in front of the rotation knob 25, the pipe 21 extends rearward in the rotation knob and is rotatably supported by the connector member 52 so that the connector member 52 is rotatable. It is configured to be fixed to. Therefore, the operation forceps having good operability without the backlash and wobble of the shaft portion 20 with the pipe 21 stably supported is configured.

  Next, the operation of the operating force transmitting mechanism 50 in the surgical forceps 1 configured as described above will be described with reference to FIG. FIG. 5 is an explanatory diagram for explaining a situation in which each part of the operating force transmission mechanism 50 changes when the handle portion 10 is closed from the opened state of the jaw 22, and FIG. 5B is a state where the first jaw member 22a and the second jaw member 22b are in contact with each other and the jaw 22 is closed, and FIG. 5C is a state where the jaw 22 is further closed from the state shown in FIG. 5B. This shows a state in which an operation force is applied in the direction.

  FIG. 5A shows the operation force transmission when the jaw 22 at the tip of the shaft portion 20 is open (or when nothing is gripped between the first jaw member 22a and the second jaw member 22b). The mechanism 50 is shown. At this time, the rod 23 is freely slidable. Therefore, when the handle portion 10 is opened and closed, the operating force on the swing handle 12 is transmitted to the second jaw member 22b via the rod 23, and the jaw 22 is opened and closed. In such a state, the first elastic member 53 is not elastically deformed, and the length A of the first elastic member 53 in the front-rear direction is the same as the length when the operation force transmitting assembly 55 is assembled (referred to as an initial set length). It is. The rotation knob 25 is at the initial position, and the interval B between the front end surface of the fixed handle 11 and the rear end surface of the second elastic member 57 is the same as the initial interval.

  FIG. 5B illustrates a state in which the first jaw member 22a and the second jaw member 22b are in contact with each other and the jaw 22 is closed (or a hard object is sandwiched between the first jaw member 22a and the second jaw member 22b). The operating force transmission mechanism 50 is shown in a state (shown). At this time, the rod 23 can slide in the direction in which the jaw 22 opens, that is, the direction in which the rod 23 moves to the left, but cannot slide in the direction in which the jaw 22 closes, that is, in the direction in which the rod 23 moves to the right. When the handle 10 is operated in the closing direction in such a state, an operation force for moving the rod 23 to the right is transmitted to the pipe 21 via the link pin 26 and the pivot pin 24, and is transmitted via the plug member 51. It acts on the first elastic member 53. Therefore, the first elastic member 53 is elastically deformed, and the length A of the first elastic member 53 in the front-rear direction is reduced from the initially set length according to the operation force. In addition, the rotation knob 25 moves rightward with the elastic deformation of the first elastic member 53, and the interval B between the front end surface of the fixed handle 11 and the rear end surface of the second elastic member 57 decreases from the initial interval.

  FIG. 5C shows the operation force transmission mechanism 50 when a large operation force for further operating the handle portion 10 in the closing direction is applied from the state shown in FIG. 5B. At this time, when the length A of the first elastic member 53 in the front-rear direction becomes a predetermined compression length (in other words, the operation force becomes equal to or more than a predetermined value), the front end surface of the fixed handle 11 and the rear end of the second elastic member 57 The distance B from the end face becomes zero, and the second elastic member 57 receives the operating force.

  As described above, in the surgical forceps 1 including the operation force transmission mechanism 50, the operation force for swinging the jaw 22 in the closing direction is applied while the jaw 22 sandwiches a hard object such as bone, metal, or ceramic. At this time, the first elastic member 53 is deformed and elastically receives the operation force. Therefore, the impact load on the portion where the jaw 22 abuts is suppressed, and the burden on the operator is reduced. Further, since a sudden increase in stress (generation of impact stress) is suppressed in each member constituting the operating force transmission system, wear and breakage of each member constituting the operation force transmission system can be suppressed, and long-term reliability can be reduced. A surgical forceps having high flexibility is provided.

  Further, the plug member 51, the connector member 52, and the first elastic member 53 constituting the operation force transmission mechanism 50 are housed and held in the body member 54 to form an integral operation force transmission assembly 55, so that the operation force transmission assembly 55 is simple and compact. An operation forceps having a long-term reliability with a simple configuration is provided.

  Further, since the plug member 51 and the connector member 52 are held by the body member 54 in a state where the plug member 51 and the connector member 52 are urged by the first elastic member 53, the plug member 51 and the connector member 52 can be held even when the jaw 22 is open. A frictional force according to the initial urging force of the first elastic member 53 acts. Therefore, even in the situation where the jaws 22 open and close freely, the knob member 56 is held rotatably with a turning resistance corresponding to the initial urging force. Therefore, the shaft portion 20 does not rotate freely against the surgeon's will, and the knob member 56 is rotated by an appropriate operation force to move the jaw 22 to a desired angular position. Can be adjusted.

  On the other hand, when the handle portion 10 is closed with the jaw 22 closed (or a hard object is sandwiched between the first jaw member 22a and the second jaw member 22b), the following occurs. First, the rotation resistance according to the urging force of the first elastic member 53 acts on the knob member 56 until the first elastic member 53 is compressed from the initially set length and the above-described interval B becomes zero. That is, the turning resistance acting on the knob 56 gradually increases in accordance with the operation force from the time when the jaw 22 is opened.

  In a state where the above-described interval B is zero and the second elastic member 57 is compressed, the knob member 56 is subjected to a frictional force corresponding to the urging force of the first elastic member 53 and a urging force of the second elastic member 57. The rotation resistance combined with the frictional force acts. Here, in the illustrated operating force transmission mechanism 50, the second elastic member 57 is formed using a resin material. In general, the friction coefficient of the resin material is smaller than the friction coefficient of the metal material, and in this embodiment, a plate material having a relatively low friction coefficient among the resin materials is used. Therefore, compared with the case where neither the first elastic member 53 nor the second elastic member 57 is present, as compared with the case where both are made of a metal material, even when a large operating force is applied to the jaw 22, the weight is lighter. The knob member 56 can be rotated by the operation force. Accordingly, even when the jaw 22 grips a hard object, the jaw 22 can be adjusted to a desired angular position with a relatively light operating force, and a highly convenient surgical forceps can be provided.

  By providing the second elastic member 57 with a predetermined clearance provided between the body member 54 of the operating force transmitting mechanism 50 and the fixed handle 11, the first elastic member 53 is further elastically deformed. The second elastic member 57 receives the load when a large operation force that swings the valve 22 in the closing direction is applied. Therefore, even if the first elastic member 53 is excessively compressed and loses elasticity, the body member 54 and the fixed handle 11 do not come into contact with each other to generate an impact stress. Therefore, it is possible to reliably reduce the impact load and the burden on the surgeon on the portion where the jaw 22 contacts, and to prevent damage to each member constituting the operating force transmission system as compared with the case where the elastic member has one stage. A surgical forceps having improved effects and further improved long-term reliability is provided.

  In the above-described embodiment, a scissor-type handle having finger holes is illustrated as the handle portion 10. However, other types of handles such as a scissor-type handle without finger holes and a stepler-type handle may be used. The same configuration can be obtained, and the same effect can be obtained. Further, one of the jaws 22 (the first jaw member 22a) is fixed to the pipe 21 and the other (the second jaw member 22b) is oscillated, but the first jaw member 22a and the second jaw member 22b are The jaws that swing together may be used.

  Also, as the operation force transmission mechanism 50, the plug member 51 is fixed to the body member 54 and the connector member 52 is slidably supported back and forth, but the connector member 52 is fixed to the body member 54 (or The body member and the connector member may be integrally formed, and the plug member may be supported on the body member 54 so as to be slidable back and forth. At this time, the rotation knob can be configured by fixing the knob member 56 to the plug member 51.

Further, the load (spring constant, elastic modulus, Young's modulus, etc.) when the first elastic member 53 is deformed by a unit length is k ₁ , and the load (same as above) when the second elastic member 57 is deformed by a unit length is k 1 _Although the configuration in which the relationship between them is k ₁ <k _{2 when 2} is described, the configuration may be such that k ₁ > k ₂ .

  Further, when the handle portion 10 is further closed in a state where the jaw 22 is closed or a hard object is sandwiched between the first jaw member 22a and the second jaw member 22b, the first elastic member 53 and Although the configuration in which the operation force in the compression direction acts on the second elastic member 57 has been described, a configuration in which the operation force in the tension direction acts on at least one of the second elastic members 57 may be employed.

DESCRIPTION OF SYMBOLS 1 Surgical forceps 10 Handle part 11 Fixed handle 12 Swing handle 20 Shaft part 21 Pipe 22 Jaw (22a first jaw member, 22b second jaw member)
23 rod 25 rotation knob 50 operating force transmission mechanism 51 plug member (51a pipe insertion hole)
52 connector member (52a pipe insertion hole)
53 first elastic member 54 body member 55 operating force transmission assembly 56 knob member

Claims (6)

A surgical device having a handle portion having a fixed handle and a swinging handle and operated by an operator to open and close, and a shaft portion having a base end portion attached to the handle portion and extending forward and provided with a jaw opening and closing at a distal end portion. An operating force transmission mechanism for forceps,
The shaft portion includes a pipe extending back and forth, the jaw openably and closably attached to a tip end of the pipe, and one end connected to the jaw and the other end inserted through the pipe and locked to the swing handle. A rod for transmitting an operating force to the swing handle to the jaw,
At the base end of the shaft portion,
A plug member for inserting the pipe and the rod back and forth,
A connector member that supports the pipe so as to be slidable back and forth and allows the rod to be inserted back and forth,
An elastic member disposed between the plug member and the connector member ;
A body that supports the connector member so as to be slidable back and forth, and integrally holds the plug member, the elastic member, and the connector member in a state where the plug member and the connector member are urged in a direction to separate the connector member and the connector member. And a member,
The operating force transmission mechanism for surgical forceps, wherein the pipe is fixed to the plug member, and the connector member is fixed to the fixed handle . The operating force transmitting mechanism for a surgical forceps according to claim 1 , wherein the pipe is inserted through the plug member and the connector member and is supported by the connector member so as to be slidable back and forth. The connector member is supported by the body member so as to be slidable back and forth and rotatable around an axis of the pipe,
The operating force transmitting mechanism for surgical forceps according to claim 1 or 2 , wherein the body member is provided with a knob member for rotating the body member with respect to the connector member. The operating force transmission mechanism for a surgical forceps according to any one of claims 1 to 3, further comprising a second elastic member provided between the body member or the knob member and the fixed handle. The surgery according to claim 4 , wherein the body member and the plug member are formed using a metal material, and at least one of the elastic member and the second elastic member is formed using a resin material. Operating force transmission mechanism for forceps. A surgical forceps provided with the operation force transmitting mechanism of the surgical forceps according to claim 1 .

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