JPH0787839B2 - Biopsy forceps - Google Patents

Description

TECHNICAL FIELD The present invention relates to a biopsy forceps for collecting a tissue in a living body cavity.

[Conventional technology]

When collecting tissue in a body cavity as a sample for performing a pathological examination, a means for inserting a biopsy forceps from a forceps channel provided in an endoscope and operating the biopsy forceps at a proximal portion is adopted. . At this time, in cutting the tissue by opening and closing the pair of open / close blades of the forceps, the forceps must be accurately opposed to the collected tissue. If the facing position of the forceps with respect to the collected tissue is not correctly determined, the tissue at a portion deviated from the target site will be collected depending on how the forceps are pressed, how the forceps are closed, and other conditions.

In order to eliminate such drawbacks, the applicant of the present application
The forceps shown in the -26876 publication was proposed. In this conventional technique, a needle member that projects in conjunction with the opening motion of the forceps member (opening and closing blade) by the operation wire and retracts in conjunction with the closing motion is provided at the tip of the operation wire, and the needle member is collected. The forceps are prevented from being displaced by being pierced into the site of the tissue to be cut.

[Problems to be solved by the invention]

However, in the above-mentioned conventional technique, the needle member is located inside the pair of open / close blades. Therefore, the needle member is hindered by the opening / closing blade to puncture the tissue at the target site sufficiently deeply, which may cause a positional shift and fail to reliably collect the tissue. In addition, the collection amount may be reduced due to the needle member being obstructed, or the tissue at the portion where the needle member is punctured may be scratched.

An object of the present invention is to provide a biopsy forceps capable of surely collecting a tissue without causing positional displacement and collecting a sufficient amount of tissue without damaging it.

[Means and Actions for Solving Problems]

According to the present invention, an operating portion for moving the operating wire back and forth is provided at the proximal end of the sheath having the operating wire inserted therethrough, while an attachment member is provided at the distal end, and a pair of cup-shaped opening / closing blades are opened / closed on the attachment member. The opening / closing blade is freely provided and is opened / closed by a back-and-forth movement of the operation wire by a link mechanism, and further, the puncture blade is extended from the mounting member along side portions of the pair of opening / closing blades. The puncture blade can puncture the tissue without being disturbed by the opening / closing blade.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.
The biopsy forceps shown in FIG. 2 is a sheath 1 composed of a tightly wound coil.
Is equipped with. An attachment member 2 is attached to the distal end of the sheath 1 and an operation portion 3 is provided at the proximal end. The mounting member 2 has a substantially cylindrical shape, and the base end side of the mounting member 2 is externally fitted and fixed to the distal end portion of the sheath 1. Also, the mounting member 2
An accommodation groove 4 is formed on the tip side of the. A pair of opening / closing blades 6 having a cup portion 5 on the tip side are provided in the housing groove 4 so as to face the cup portion 5 and accommodate a link portion 7 on the base end side. The base portions of the pair of link portions 7 are pivotally attached to a pair of side walls 8 forming the accommodation groove 4 of the mounting member 2 by a support shaft 9 so as to be openable and closable. Then, the side wall 8
A puncture blade 11 extends from one side along the side portions of the pair of open / close blades 6. The puncture blade 11 is formed such that the width and thickness of the tip are gradually reduced, and both ends in the width direction are formed into the blade 11a over the entire length. Also,
The pair of open / close blades 6 have the edges of the cup portion 5 formed on the blades 5a as shown in FIG. And the opening and closing blade 6
Have a structure in which when the blades 5a are closed to each other, a part of the blades 5a are in sliding contact with the puncture blade 11, and the other parts are in contact with each other when the blades are completely closed. The length of the puncture blade 11 is set so that the tip of the puncture blade 11 matches the tip of the opening / closing blade 6 when the opening / closing blade 6 is closed.

Each of the link members 7 of the open / close blade 6 has a link member 12
One end of is supported by a spindle 13. The other ends of these link members 12 are pivotally attached to the connecting member 14. The distal end of the operation wire 15 inserted into the sheath 1 is connected and fixed to the connecting member 14. The operating wire 15 is pushed and pulled by the operating portion 3 provided at the proximal end of the sheath 1. That is, the operating portion 3 is composed of a main body portion 17 having a finger hanging ring 16 and a slider 18 slidably provided on the main body portion 17, and the proximal end of the operating wire 15 is connected to the slider 18. .
Therefore, the thumb is put on the finger hook ring 16 and the slider 18 is slid by the index finger and the middle finger to move the operation wire 15
By pushing and pulling, the pair of open / close blades 6 can be opened and closed via the ring member 12.

In the sheath 1, as shown in FIG. 1, a first close-wound coil 1a located on the distal end side and a second close-wound coil 1b located on the proximal end side are connected by a connecting member 19. .

Next, a case where a biological tissue is collected with the biopsy forceps will be described. First, if the biopsy forceps is inserted into the body cavity through the forceps channel (not shown) of the endoscope 21 as shown in FIG. 7, the distal end of the sheath 1 is observed under the observation of the endoscope 21. The pair of open / close blades 6 is brought close to the tissue S of the living body to be sampled. At this time, the puncture blade 11 extended from the attachment member 2 is positioned on the tissue S side. Next, when the pair of open / close blades 6 is opened by operating the operation portion 3 as shown in FIG. 6, the sheath 1 is advanced in this state to puncture the tissue S with the puncture blade 11. Then, the tissue S to be sampled becomes inside the puncture blade 11 and enters the pair of open / close blades 6. Therefore, if the open / close blade 6 is closed in this state, a part of the tissue S is punctured by the puncture blade 11. It is sheared by 11 and the opening / closing blade 6, and the remaining part is pinched by the pair of opening / closing blades 6. Therefore, the cut-out tissue S is housed between the pair of open / close blades 6 and the puncture blade 11 joined to the side portions thereof.

According to such a biopsy forceps, since the puncture blade 11 is on the side of the opening / closing blade 6, when the tissue S is punctured, the opening / closing blade 6
The tissue S can be pierced deeply without being disturbed by the. Therefore, when the opening / closing blade 6 is closed, the target tissue S does not escape, and a sufficient amount can be reliably collected. Further, since the puncture blade 11 is extended from the attachment member 2 along the axial direction of the sheath 1, the puncture blade 11 can be easily and accurately punctured to the target site by advancing the sheath 1. Further, since the puncture blade 11 is provided in a state of being joined to the side portion of the opening / closing blade 6, the outer shape formed by the opening / closing blade 6 and the puncture blade 11 can be made smooth, and the body cavity can be seen endoscopically. Do not damage the forceps channel when inserting into

Further, since the puncture blade 11 is located outside the tissue S to be sampled, the tissue S can be sampled without damaging it. Moreover, since the puncture blade 11 is located outside the pair of open / close blades 6, a large amount of tissue S can be collected. Furthermore, since the tissue S is sheared by the puncture blade 11 and the opening / closing blade 6, the sharpness is better than when the tissue S is cut by abutting a pair of blades. Particularly, when the tissue S is pulled toward the center of the lumen by using the bending function of the endoscope 21 as shown in FIG. 8, it is only the sheared portion that needs to be cut off for collection. It can be cut well.

The present invention is not limited to the above-described embodiment. For example, if the sheath 1 is formed of a so-called multi-strand coil and has a structure that is more flexible toward the tip side, the puncture blade 11 can be oriented in a desired direction. The twisting torque for changing can be satisfactorily transmitted to the tip.

Further, if a part of the side portion of the pair of open / close blades 6 opposite to the puncture blade 11 is cut out, the tissue S to be sampled will not protrude to the outside from the cutout portion, so that the collection amount is increased. Can be measured.

Further, if the structure is such that the blades 5a of the pair of open / close blades 6 are brought into sliding contact without being brought into contact with each other, the tissue S is sheared, so that the sharpness can be further improved.

〔The invention's effect〕

As described above, according to the present invention, the puncture blade is extended from the attachment member to which the pair of open / close blades are attached along the side portions of the pair of open / close blades. Therefore, when puncturing the tissue with the puncture blade, there is no possibility that it cannot be punctured sufficiently deeply due to the opening / closing blade.Therefore, the tissue should be collected surely without displacement and with a sufficient collection amount. You can Furthermore, since the tissue inside the puncture blade is collected by the pair of open / close blades, the collected tissue is not scratched.

[Brief description of drawings]

The drawings show an embodiment of the present invention. Fig. 1 is a cross-sectional view of the distal end of the sheath, Fig. 2 is a side view of the entire biopsy forceps, Fig. 3 is a plan view of a mounting member, and Fig. 4 is the same front view. Fig. 5, Fig. 5 is a cross-sectional view taken along the line RR in Fig. 3, Fig. 6 is a perspective view with a pair of open / close blades opened, and Figs. 7 and 8 are explanatory views when collecting tissue. Is. 1 ... Sheath, 2 ... Mounting member, 6 ... Opening and closing blade, 12 ...
Link member, 11 …… Puncture blade, 15 …… Operating wire.

Claims (1)

[Claims] 1. A sheath, an operating wire inserted through the sheath, an operating portion provided at a proximal end of the sheath for moving the operating wire back and forth, an attachment member provided at a distal end of the sheath, A pair of substantially cup-shaped opening / closing blades provided on the mounting member so as to be openable / closable, a link mechanism for opening / closing the pair of opening / closing blades by the forward / backward movement of the operation wire, and side portions of the pair of opening / closing blades from the mounting member. A biopsy forceps, comprising: a puncture blade extending along the puncture blade.