JP3264359B2 - Medical forceps - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a medical forceps which is advantageous for performing an operation on an affected part through the inside of a pipe such as a laparoscopic operation.

[0002]

2. Description of the Related Art In operation, forceps having various shapes are used according to purposes such as hemostasis and collection of living tissue. For example, as shown in FIG. 5, a general hemostat has a pair of levers 51 rotatably connected at predetermined positions by a shaft 52. Then, a working part 53 for stopping the bleeding with a blood vessel therebetween or collecting the tissue with the tissue sandwiched from the shaft 52 to one end side.
Is formed, and at the other end, a grip portion 54 for the operator to insert and operate with a finger is formed, and a handle portion 55 is formed between the grip portion 54 and the shaft 52. Example).

[0003] In recent years, an operation has been performed in which a surgical instrument is inserted into a pipe provided in an endoscope to collect or resect tissue. As a forceps used in such an operation, a forceps called a Yawman or a helget shown in FIG. 6 is known. The helget forceps includes a frame 61 having a predetermined length, a fixed grip portion 62 fixed to an end of the frame 61, and a rotary grip portion configured to be rotatable with respect to the fixed grip portion 62. 63, a working unit 64 provided at the other end of the frame 61, and a transmitting unit (not shown) that converts the rotating motion of the rotating gripping unit 63 provided along the frame 61 into a linear motion and transmits the linear motion to the working unit. (Second known example).

[0004]

The forceps according to the first known example can obtain a sufficiently large working stroke.
In addition, since the operation of the grip portion is directly transmitted to the working portion, there is an advantage that the usability is good. However, when the forceps are passed through the inside of the pipe, there is a problem that the working portion cannot be opened and closed because the handle interferes with the inner surface of the pipe.

[0005] That is, a pair of levers are approximately X about the axis.
Because the forceps are intersected, when the forceps are inserted into the pipe, even if the gripper is operated to open the working unit,
The working stroke of the working unit is limited by the angle at which the handle contacts the inner surface of the pipe, and a sufficiently large working stroke cannot be obtained.

The helget forceps according to the second known example is extremely advantageous for working through the inside of the pipe, but on the other hand, the frame bends in response to the force applied when the gripping part is operated, so that the working part cannot be sufficiently operated. There is a problem that it is not possible to transmit a strong force, a problem that the force transmission mechanism is complicated and the cost is high, and furthermore, there is a problem that it is difficult to perform a sterilization process due to the complexity of the mechanism.

An object of the present invention is to provide a medical forceps which can obtain a sufficient working stroke even when it is used while being passed through a pipe, has a simple structure, and is easy to sterilize. is there.

[0008]

In order to solve the above-mentioned problems, a medical forceps according to the present invention (hereinafter, simply referred to as "forceps") comprises a pair of rotatable levers, and one of the levers is pivoted from a pivot point. In a medical forceps having a working portion provided on an end portion and a grip portion provided on the other end, a handle portion from a rotation fulcrum of each lever to a grip portion is overlapped with each other in a thickness direction. The arrangement is such that when the working section is closed, the side faces in the same direction of each handle cross each other.

In the above forceps, when the working portion is closed, the side surfaces of the handle portions of the pair of levers in the same direction cross each other. Therefore, by setting the width dimension of the pair of levers in the above state to be substantially equal to the inner diameter of the pipe,
By operating the grip, the working unit can be opened until the opposite surfaces of the respective levers are substantially parallel. For this reason,
At the time of laparoscopic surgery, a target operation can be performed through the inside of a pipe provided in the laparoscope.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the forceps will be described below with reference to the drawings. FIG. 1 is a view for explaining a forceps in a state in which a working section is closed, FIG. 2 is an enlarged view of a handle section in a state in which the working section is closed, FIG. 3 is a perspective view of FIG.
FIG. 4 is a diagram illustrating the relationship between the handle and the working unit when using forceps.

The forceps A shown in the figure is inserted through a pipe provided in a laparoscope (not shown) so as to stop bleeding and perform other desired operations. Nevertheless, the configuration is such that a sufficient working stroke can be realized by performing the same operation as that of operating a normal forceps by a practitioner.

In the drawing, a forceps A includes a pair of levers 1 and 2.
The levers 1 and 2 are configured to be rotatable with each other by being mounted on the shaft 3. A portion between the shaft 3 and one end (the left side in FIG. 1) is formed as a tip portion 4, and a working portion 5 for performing a target operation over a predetermined length range from the tip of the tip portion 4 is formed. ing. On the other end (right side in FIG. 1) from the shaft 3, a grip 6 is formed for the operator to insert a finger to perform opening and closing operations, and a handle 7 is formed between the shaft 3 and the grip 6. Have been. Further, stoppers 8 are formed in the vicinity of the gripper 6 to engage with each other and maintain the posture of the forceps A when closed.

After passing through the pipe, the working part 5 reaches the affected part in a state of being exposed in the abdominal cavity, and opens and closes in accordance with the operation of the grip part 6 to clamp a blood vessel, or to clamp a target part, or It has a function of performing a task for another purpose. For this reason, the working part 5 is formed in a shape corresponding to the intended function, and the shape of the distal end part 4 including the working part 5 is formed with a dimension that can be inserted into the pipe. In particular, in this example, the tip portion 4 is formed in a straight line.

The handle 7 comprises a shaft 3 of each of the levers 1 and 2 and a gripper 6.
As shown in FIGS. 2 and 3, they are arranged so as to overlap each other in the thickness direction (the left-right direction in FIG. 3). The dimension in the width direction (vertical direction in FIG. 3) of the handle 7 in each of the levers 1 and 2 is formed so as to be largest at a portion near the shaft 3 and to decrease toward the grip portion 6. I have. The dimension of the narrowest part in the handle 7 has a value that is about の of the dimension of the widest part. However, this ratio is not particularly limited.

The diameter of the pipe provided in the laparoscope is generally 6
It is about mm to 10 mm. Therefore, the forceps A is configured to have a size smaller than the above-described size. For example, in the forceps A applied to a laparoscope having a pipe diameter of 10 mm, even if the largest width of the levers 1 and 2 is 8 mm. Is set to When the maximum width of the levers 1 and 2 is 8 mm, the dimension of the narrowest part of the handle 7 is set to about 4 mm.

The side surfaces (the upper side surfaces 1a and 2a and the lower side surfaces 1b and 2b in the drawing) of the handle 7 of each lever 1 and 2 cross each other when the working unit 5 is closed. It is configured to be.

That is, the handle 7 of the lever 1 is located on the lower side 1b.
Are formed on the extension of the front end portion 4, and the upper side surface 1a is formed closer to the side surface 1b side in accordance with the change in the width dimension of the handle portion 7. The opposing surface 1c opposing the lever 2 is formed as a flat surface. The handle 7 is formed to be bent in a “<” shape near the grip 6.

Similarly, the handle portion 7 of the lever 2 is
a is formed on the extension of the front end portion 4, and the lower side surface 2 b is changed to the side surface 2 a in accordance with a change in the width dimension of the handle portion 7.
It is formed close to the side. The surface 2c facing the lever 1 is formed as a flat surface. And gripper 6
Is bent in the shape of a "<" in the vicinity of.

As described above, the handle 7 of the lever 1 and the lever 2
Have the same shape when the opposing surfaces 1c and 2c are arranged in the same direction, respectively, and by connecting the levers 1 and 2 by the shaft 3 with the opposing surfaces 1c and 2c facing each other,
Side faces 1a, 2a and 1b, 2b in the same direction cross each other.

That is, when the levers 1 and 2 are closed and the stopper 8 is engaged, the lower side surface 1b of the lever 1 and the upper side surface 2a of the lever 2 are located on an extension of the tip portion 4 and They are almost parallel. Since the dimension of the narrowest part in the handle 7 of each lever 1 and 2 is about 1/2 of the widest part near the shaft 3, the lever 1
The upper side surface 1a of the lever 2 is located on the side surface 1b lower than the side surface 2a which is the side surface of the lever 2 in the same direction. Similarly, the lower side surface 2b of the lever 2 is higher than the lower side surface 1b of the lever 1. It is located on the upper side surface 2a side.

As described above, the side surfaces 1a,
2a and 1b, 2b intersect with each other so that the working unit 5
When the gripper 6 is operated so as to open the lever, it is possible to provide a margin for the rotation angles of the levers 1 and 2 according to the crossed dimensions.

The forceps A of the present embodiment, when the working part 5 is closed and the stopper 8 is engaged, the tip part 4 and the handle 7
Are substantially linear, and the width of the levers 1 and 2 in the rotation direction (the size of the portion corresponding to the shaft 3 is maximized) is configured to be smaller than the inner diameter of the target pipe.

When the forceps A configured as described above is rotated in a direction in which the working unit 5 is opened from a state in which the working unit 5 shown in FIG. 1 is closed, the handle portions 7 of the levers 1 and 2 are the same. The state where the side surfaces 1a, 2a and 1b, 2b cross each other is shifted to a state in which the side surfaces 1a, 2a overlap each other as shown in FIG. 4A, and the working unit 5 is opened with this rotation. In this state, the apparent width at the handle 7 of each of the levers 1 and 2 is smaller than the width when the working unit 5 is closed.

Therefore, as shown in FIG. 2B, it is possible to open the working unit 5 with a sufficiently large size by rotating the levers 1 and 2 in the direction of the arrow. In particular, when the working unit 5 is opened with the forceps A inserted through the pipe, the levers 1 and 2 are rotated until a part of the side surfaces 1a and 2b of the handle 7 comes into contact with the inner surface of the pipe. , The working section 5 can be sufficiently opened.

Since the above-mentioned forceps A are used repeatedly, a sterilization process is performed each time the forceps A are used. Therefore, lever 1,
Preferably, the shaft 2 and the shaft 3 are made of stainless steel. In particular, it is desirable that the shaft 3 be a screw shaft and a thread portion is formed on one of the levers 1 and 2 so that the forceps A can be disassembled during the sterilization process.

As described above, the forceps A have substantially the same structure as that of the conventionally used hemostatic forceps, although they have a different shape. That is, since it does not have a complicated structure like a helget forceps, it is possible to easily perform a sterilization process.

[0027]

As described above in detail, in the forceps according to the present invention, a pair of levers are rotatably supported by a shaft, and a handle formed between the shaft and the grip portion is fixed to the handle. Since the side surfaces in the same direction are configured to intersect with each other, it is possible to obtain a rotation angle of the lever according to the overlapping dimension of the handle. Therefore, a large working stroke can be realized even when the medical instrument such as a laparoscope is inserted into a pipe provided on the medical instrument. In particular, since the force applied to the grasping portion can be directly transmitted to the working portion, a smooth operation can be performed.

Further, since the structure is simple, even in the case of performing a sterilization process, the process can be performed without bias and the reliability of the sterilization can be improved.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating forceps in a state in which a working unit is closed.

FIG. 2 is an enlarged view of a handle portion in a state where a working unit is closed.

FIG. 3 is a perspective view taken along the line III-III of FIG. 2;

FIG. 4 is a diagram illustrating a relationship between a handle and a working unit when using forceps.

FIG. 5 is a diagram illustrating a configuration of a conventional hemostat.

FIG. 6 is a diagram illustrating a configuration of a helget forceps.

[Explanation of symbols]

 A Forceps 1, 2 Lever 1a, 1b, 2a, 2b Side surface 1c, 2c Opposing surface 3 Axis 4 Tip 5 Working unit 6 Gripping unit 7 Handle 8 Stopper

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) A61B 17/28

Claims (1)

(57) [Claims] 1. A medical forceps comprising a pair of rotatable levers and having a working part provided at one end from a rotation fulcrum and a gripper provided at the other end. The handle portions between the rotation fulcrum and the grip portion are arranged so as to overlap with each other in the thickness direction, and the side faces in the same direction of each handle portion cross each other when the working portion is closed. Medical forceps.