JP5840472B2 - Endoscopic surgical forceps - Google Patents

Description

  The present invention relates to an endoscopic surgical forceps.

  2. Description of the Related Art Conventionally, in endoscopic surgery, endoscopic surgical forceps that are inserted into the abdominal cavity from outside the body via a bypass path such as a trocar and used for tissue cutting, grasping, peeling, and the like are known.

  As the forceps for endoscopic surgery, for example, a pair of arm-like members that are pivotally supported so as to cross each other at the distal end portion of a forceps made of a tubular member and are rotatable with respect to the shaft, and the tubular member Some of them are provided with a cam rod which is provided so as to be able to move forward and backward, and which rotates the arm-like member. The endoscopic surgical forceps are provided opposite to each other at the distal end portion of the arm-like member, and include a treatment portion used for tissue cutting, grasping, peeling, etc. An outer surface cam portion is provided on the side opposite to the treatment portion, and an elongated hole-like inner surface cam portion is provided on the treatment portion side of the rear end portion of the arm-like member.

  Further, a first pin that comes into contact with the outer surface cam portion as the cam rod advances and a second pin that comes into contact with the inner surface cam portion as the cam rod moves backward are provided at the tip of the cam rod. It has been. And the said inner surface cam part with which the said 2nd pin contact | abuts becomes the linear form which cross | intersects the axial direction of the said tubular member (for example, refer patent document 1).

  In the endoscopic surgical forceps, when the cam rod is advanced in the direction of the treatment portion, the first pin is pressed against the outer surface cam portion, and the crossing angle of the pair of arm-like members is increased. Thus, the treatment section is opened. Further, when the cam rod is retracted in the direction opposite to the treatment portion, the second pin is pressed against the inner surface cam portion, and the crossing angle of the pair of arm-like members is reduced, whereby the treatment portion is Closed.

Japanese Patent No. 4614965

  However, in the conventional forceps for endoscopic surgery, the inner surface cam portion with which the second pin abuts has a linear shape that intersects the axial direction of the tubular member. Therefore, when the cam rod is retracted in the direction opposite to the treatment portion and the second pin is pressed against the inner surface cam portion to close the treatment portion, a relatively large force is required, which makes operation difficult. There is a disadvantage that sometimes.

  It is an object of the present invention to provide an endoscopic surgical forceps that can solve such inconvenience and can be easily operated even when a treatment section is closed.

In order to achieve such an object, the present invention provides a pair of arm-like members that are pivotally supported at the distal end portion of a tubular member and pivotally supported with respect to the shaft, and are advanced and retracted in the tubular member. A cam rod that is freely provided to rotate the arm-shaped member, a treatment portion provided opposite to the distal end portion of the arm-shaped member, and a treatment portion on the opposite side of the treatment portion at the rear end portion of the arm-shaped member An outer surface cam portion provided, an inner surface cam portion provided on the treatment portion side of the rear end portion of the arm-like member, and provided on the distal end portion of the cam rod, the outer surface cam portion as the cam rod advances. In the endoscopic surgical forceps comprising a first pin to be contacted and a second pin that is provided at the tip of the cam rod and is in contact with the inner surface cam portion as the cam rod is retracted, the inner surface cam portion Is a bay that bulges toward the outer cam portion with respect to a straight line that intersects the axial direction of the tubular member. Ri Do from the surface, the arm-like member is characterized that you have opened the portion opposed to the curved surface of the inner surface cam portion.

  The endoscopic surgical forceps of the present invention can perform cutting, grasping, peeling, and the like of tissue by the treatment section. According to the endoscopic surgical forceps of the present invention, first, when opening the treatment portion, the cam rod is advanced, the first pin is brought into contact with the outer surface cam portion, and further pressed toward the distal end portion. . If it does in this way, a pressing force will act on the direction in which each rear end part of the pair of arm-like members spaces apart from each other by the first pin. As a result, each arm-like member rotates with respect to the shaft, the treatment sections move in directions away from each other, and both treatment sections are opened.

  Next, when closing the treatment portion, the cam rod is retracted, the second pin is brought into contact with the inner surface cam portion, and further pressed toward the rear end portion. If it does in this way, a pressing force will act on the direction which each rear end part of the pair of arm-like members adjoins mutually by the 2nd pin.

  At this time, in the endoscopic surgical forceps according to the present invention, the inner cam portion is formed of a curved surface that bulges toward the outer cam portion with respect to a straight line that intersects the axial direction of the tubular member. Therefore, as the cam rod is retracted, the second pin is guided by the curved surface of the inner surface cam portion and can move smoothly toward the rear end portion. As a result, the initial operation when closing the treatment section can be performed with a small force.

  Further, when the tissue or the like is cut by the treatment section, it is necessary to completely close the treatment section. At this time, in the endoscopic surgical forceps of the present invention, the inner surface cam portion is formed of a curved surface that bulges toward the outer surface cam portion side with respect to a straight line intersecting the axial direction of the tubular member. The cam portion has a larger ratio of being close to each other in the length direction toward the rear end portion side. As a result, when the operation of closing the treatment portion is completed, the second pin can reliably close the treatment portion with a small amount of movement.

  Therefore, according to the endoscopic surgical forceps of the present invention, the operation can be easily performed even when the treatment portion is closed.

Further , in the endoscopic surgical forceps according to the present invention, since the portion of the arm-shaped member facing the curved surface is opened, the cam rod is advanced, and each arm-shaped member is moved with respect to the axis. When rotated, the rear end portion of each arm-shaped member does not protrude outward from the side surface of the tubular member.

  Therefore, the endoscopic surgical forceps of the present invention having the above-described configuration can prevent the operation of other instruments from being obstructed in the abdominal cavity or the like.

The top view which cuts and shows a part of forceps for endoscopic surgery as one structural example of this invention. The top view which expands and shows the arm-shaped member of the forceps for endoscopic surgery shown in FIG. Explanatory drawing which shows the action | operation of the forceps for endoscopic surgery shown in FIG.

  Next, embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

  As shown in FIG. 1, the forceps 1 for endoscopic surgery according to the present embodiment is a pair of shafts that are pivotally supported so as to intersect with each other at the distal end portion of a tubular member 2 and are rotatable with respect to a shaft 3. Arm-like members 4a and 4b and a cam rod 5 provided in the tubular member 2 so as to freely advance and retract are provided. The arm-like members 4a and 4b have the same shape, and are supported on the shaft 3 by being combined so as to be front and back.

  Treatment portions 6a and 6b for cutting, grasping, peeling, and the like of tissues are provided at the distal ends of the arm-like members 4a and 4b so as to face each other. The arm-like members 4a and 4b are provided at the rear end portions thereof with outer cam portions 7a and 7b provided on the opposite side of the treatment portions 6a and 6b, and inner cam portions 8a provided on the treatment portions 6a and 6b side. 8b.

  Further, a first pin 9 that comes into contact with the outer surface cam portions 7a and 7b as the cam rod 5 moves forward is brought into contact with the inner surface cam portions 8a and 8b as the cam rod 5 moves backward. The second pin 10 is provided.

  The inner surface cam portions 8a and 8b have a curved surface 11 that bulges toward the outer surface cam portion 7a with respect to a straight line L that intersects the central axis C of the tubular member 2 as shown in FIG. In addition, the portion facing the curved surface 11 is an open portion 12.

  Next, the operation of the endoscopic surgical forceps 1 of this embodiment will be described. First, when the treatment portions 6a and 6b are opened, the cam rod 5 is advanced in FIG. 1, the first pin 9 is brought into contact with the outer surface cam portions 7a and 7b, and further pressed toward the distal end portion. As shown in FIG. 1, the outer surface cam portions 7a and 7b intersect each other, and the first pin 9 is pressed by the intersecting portion of the outer surface cam portions 7a and 7b.

  Therefore, as described above, the first pin 9 applies a pressing force in a direction in which the rear end portions of the pair of arm-like members 4a and 4b are separated from each other. As a result, the arm-like members 4a and 4b are rotated with respect to the shaft 3, and the treatment sections 6a and 6b are moved away from each other, so that the treatment sections 6a and 6b are opened as shown in FIG. It is.

  At this time, at the rear end portions of the arm-like members 4 a and 4 b, the portions facing the curved surface 11 of the inner surface cam portions 8 a and 8 b are open portions 12, so that the respective rear end portions are side surfaces of the tubular member 2. It does not protrude outward from. Note that a stopper (not shown) is provided in the vicinity of the side surface portion of the tubular member 2 and is regulated so that the rear end portions of the arm-like members 4a and 4b are not separated more than necessary.

  Next, when closing the treatment portions 6a and 6b, the cam rod 5 is retracted in FIG. 3 to bring the second pin 10 into contact with the inner surface cam portions 8a and 8b. At this time, as shown in FIG. 2, the inner surface cam portions 8 a and 8 b include a curved surface 11 that bulges toward the outer surface cam portion 7 a with respect to a straight line L that intersects the central axis C of the tubular member 2. The curved surface 11 moves the second pin 10 in contact with the inner surface cam portions 8a, 8b in the direction of the rear end compared to the case where the inner surface cam portions 8a, 8b are formed of surfaces corresponding to the straight line L. It has become “escape”.

  As a result, in the endoscopic surgical forceps 1 of the present embodiment, the second pin 10 can be guided to the curved surface 11 and smoothly moved toward the rear end as the cam rod 5 moves backward. The initial operation when closing the portions 6a and 6b can be performed with a small force.

  Further, when the tissue or the like is cut by the treatment units 6a and 6b, it is necessary to completely close the treatment units 6a and 6b. At this time, in the endoscopic surgical forceps 1 of the present embodiment, the inner cam portions 8a and 8b are provided with a curved surface 11, and the curved surface 11 is closer to the longitudinal direction of the tubular member 2 toward the rear end portion. Proximity is increasing. As a result, when the operation of closing the treatment portions 6a and 6b is completed, the second pin 10 can move the treatment portion with a small amount of movement compared to the case where the inner surface cam portions 8a and 8b are formed of surfaces corresponding to the straight line L. 6a and 6b can be closed reliably.

  Therefore, according to the endoscopic surgical forceps 1 of the present embodiment, the operation can be easily performed even when the treatment sections 6a and 6b are closed.

  DESCRIPTION OF SYMBOLS 1 ... Endoscopic forceps, 2 ... Tubular member, 3 ... Shaft, 4a, 4b ... Arm-like member, 5 ... Cam rod, 6a, 6b ... Treatment part, 7a, 7b ... External surface cam part, 8a, 8b ... Inner cam part, 9 ... 1st pin, 10 ... 2nd pin, 11 ... Curved surface, 12 ... Opening part.

Claims (1)

A pair of arm-like members that are pivotally supported at the distal end portion of the tubular member and are rotatably provided with respect to the shaft, and are provided in the tubular member so as to be able to advance and retreat, and rotate the arm-like member. A cam rod,
A treatment portion provided opposite to the distal end portion of the arm-like member; an outer surface cam portion provided on a side opposite to the treatment portion of a rear end portion of the arm-like member; and a rear end of the arm-like member An inner surface cam portion provided on the treatment portion side of the portion;
A first pin provided at the distal end portion of the cam rod and abutted against the outer surface cam portion as the cam rod advances, and provided at a distal end portion of the cam rod and abutted against the inner surface cam portion as the cam rod moves backward In an endoscopic surgical forceps comprising a second pin to be operated,
Inner surface cam portion, to a straight line intersecting the axial direction of the tubular member, Ri Do a curved surface bulging outer face cam portion,
The arm-like member is endoscopic forceps characterized that you have opened the portion opposed to the curved surface of the inner surface cam portion.

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