JP3122308U6 - Endoscopic forceps with 3 hinges - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an endoscopic forceps having three hinges that can be configured in a bipolar manner in a structurally simple and robust manner.
SOLUTION: A pipe 2 and a movable rod 3 disposed in the pipe are provided at the distal end of a movable rod 3 and have pivotable first and second holding portions 4, 5 supported by three hinges. The first holding portion is pivotally supported by the third shaft 6 on the second holding portion and the first shaft 9 is pivotally supported by the rod, and the second holding portion is pivotally supported by the second shaft 7 on the pipe. In the endoscopic forceps, the pipe and the rod are connected to a high frequency power source, the pipe, the rod and the holding portion are formed of a conductive metal, the first and second axes are made conductive, the third axis is made insulating, and the second An insulator 11 that surrounds the distal end of the first holding portion from the side is provided at the opening of the hawk-like end portion 10 formed in the holding portion.
[Selection] Figure 1

Description

  This invention relates to an endoscopic forceps of the type described in the superordinate concept of claim 1.

  This type of forceps is known, for example, from US6063103A (see FIGS. 15 and 22). When the three axes are properly arranged in a triangular shape, a forceps dynamic characteristic with sufficient force for surgical use and sufficient opening angle of both gripping portions is obtained.

  Increasingly, modern external science that minimizes infringement requires bipolar forceps, ie, forceps that have their mouths connected to different poles of a high frequency power supply. Thus, the tissue held between the holding portions can be coagulated by energization between the holding portions. However, conventionally, in the case of forceps having this type of structure, a bipolar structure mode has not been realized. This type of structure is extremely complex in the range of three hinges. In the case of the parts engaging with each other in the form of filigree, it is considered that it is necessary to insulate the holding parts from each other with a large number of thin insulating layers. Will be induced.

Disadvantageously, known structures of this kind, such as those known from the cited publications mentioned at the outset, are very unsuitable for insulation purposes. The hawk-like end is formed in the first holding portion. That is, the hawk-like end faces inward with respect to the enclosed area of the second holding portion and faces outward with respect to the portion surrounding the hawk-like end of the pipe and towards the other pole, and thus inward. Must be insulated to the outside as well. Since it is necessary to increase the thickness of the insulating material for the insulation of the applied voltage, the critical axial range of the holding portion subjected to a high load is significantly reduced in strength.
US6063103A

  The object of the present invention is to construct a forceps of the type described above in a bipolar manner in a structurally simple and robust manner.

  In accordance with the present invention, the holding portion is connected to a pipe or a rod that can be energized through a long shaft without the need for a supplementary electric wire, in a simple and robust manner via the second hinge or the first hinge, Are combined. In the case of the structure according to the present invention, the hawk-like end portion is formed in the second holding portion that is conductively coupled to the pipe. That is, the outer portion of the hawk-like end can be configured without being insulated from the pipe. The insulator is only required on the inner surface of the fork end between the fork end and the enclosed part of the first holding part, so that it has sufficient thickness, i.e. large insulation. It can be configured to have a breaking strength. The insulator is not only arranged laterally between the two holding parts, but also in the distal direction, i.e. the distal part at the other pole, in the region of the first holding part in the hawk-like end. Surrounding in the direction of the shaft, thus also a high dielectric breakdown strength is obtained. A bipolar structure can be configured in a desired manner, and a structure with excellent insulation and robustness and high use reliability can be obtained.

  The insulator can be arranged movably with respect to both holding parts, or fixed in a shape-bonded state to one holding part. The features of claim 2 are preferably realized. Thus, the insulator is fixed with respect to the second holding part by pivoting on the two hinges which pivot the second second holding part, thus the insulator always takes a unique position. Always provide the necessary insulation path.

  The third hinge can be configured to be electrically insulated with respect to both holding portions in a suitable manner. In this case, it is preferable to realize the feature of claim 3. In this case, the holding part is preferably made of ceramic according to claim 4 and is therefore supported side by side in a structurally simple manner by an integral insulating shaft having a high mechanical strength.

  The insulator is also preferably composed of ceramic according to claim 5 and thus has good electrical and mechanical properties.

  The feature of claim 6 is preferably realized. Thus, in all pivot positions, the area of the first hinge between the first holding part and the rod is insulated from the pipe so that a high breakdown strength is obtained.

  Next, the best mode for carrying out the present invention will be described.

  An embodiment of an endoscopic forceps according to the present invention will be described with reference to FIGS. 1 and 2 schematically showing. The illustrated endoscopic forceps 1 has a long shaft (only a distal end is shown) composed of a pipe 2 and a rod 3 provided in the pipe. The rod 3 is provided in the pipe 2 and can be moved in the longitudinal direction with respect to the pipe by a handle (not shown) provided at the proximal end of the pipe 2.

  At the distal ends of the shafts 2 and 3, a first holding portion 4 and a second holding portion 5 are pivotally supported by three hinges.

  As shown in FIGS. 1 and 2, the first holding portion 4 and the second holding portion 5 are axially supported by a third hinge in the form of a third shaft 6. The second holding part 5 is supported by a side plate 8 protruding to the side of the pipe 2 by a second hinge in the form of a second shaft 7. The proximal end of the first holding portion 4 is pivotally supported on the distal end of the rod 3 by a first hinge comprising a first shaft 9.

  FIG. 1 shows the forceps in a state where the first and second holding portions 4 and 5 are closed. When the rod 3 is slid in the distal direction with respect to the pipe 2 from this state, both holding parts 4 and 5 are opened. When the rod 3 is pulled back, both holding parts are closed. For details on dynamics, see the publication cited at the beginning.

  In order to construct the illustrated forceps 1 to be bipolar, the pipe 2, the rod 3, the second shaft 7, the first shaft 9, and the holding portions 4, 5 of both are made of a conductive metal. Although not shown, preferably, in the region of the proximal end of the shaft, the pipe 2 and the rod 3 can be connected to different poles of the high-frequency power supply by means of suitable connection devices. The current flows from the pole provided on the rod 3 to the first holding portion 4 via the first shaft 9. The current flows from the pipe 2 to the second holding portion 5 through the second shaft 7. With both holding parts, for example, when the blood vessel is gripped and compressed and then a current is applied, the blood vessel is closed by electrocoagulation.

  In the case of the structure of the forceps 1 shown in the drawing, care is taken so that both electrodes are thoroughly insulated from each other as a whole. This is particularly difficult in the range of the three axes 6,7,9.

  As can be seen in particular in FIG. 2, the second holding part 5 is configured as a hawk-like end 10 in the range of the third axis 6, in this case the hawk opening of this hawk-like end 10 is In this range, the first holding portion 4 is surrounded from both sides. The hawk-like end portion 10 abuts on the side plate 8 of the pipe 2 on the outer surface thereof. Since the second holding part 5 and the pipe 2 are connected to the same pole, insulation at this point is not necessary.

  In order to insulate the two holding parts 4 and 5 from each other, the third shaft 6 for joining the two holding parts is made of an insulating material, and in the preferred embodiment, is made of a high strength electrically insulating ceramic. To do.

  The fork opening formed from the fork-like end 10 of the second holding portion 5 is provided with an insulator 11 (shown with crossed diagonal lines), preferably also made of ceramic. This insulator 11 is provided on both sides between the first holding portion 4 and the hawk-like end portion 10 in the transition range between the hawk-like end portion 10 and the first holding portion 4. The shaft 6 is pivotally supported.

  The insulator 11 is closed in the distal direction of the first holding part 4, as shown in FIG. 2, and again in this case in particular in the other, ie the second holding part 5. Good insulation is achieved with respect to the coupled second shaft 7.

  In the case of the preferred embodiment shown, the insulator 11 extends beyond the second shaft 7 on the distal side and is supported on this second shaft 7. Since the second holding portion 5 and the insulator 11 are pivotally supported by both shafts 7 and 6, they are fixed together at the positions shown in the figure for common movement.

  An insulating sleeve 12 that covers the inner surface of the pipe 2 and covers the end surface of the pipe 2 in the range between the side plate 8 and the pipe 2 is provided. The insulating sleeve 12 is in the range of the hinge connection between the first holding part 4 and the rod 3 connected to the other pole, and in all pivot positions between the pipe 2 and the first holding part. Provide sufficient breakdown strength.

  The three hinges (6, 7, 9) of the holding part of the illustrated forceps 1 have shafts 6, 7, 9 penetrating therethrough, respectively. These hinges can also be configured in another type of structure (not shown). Each of these hinges can be composed of two separate shaft pieces, in this case, for example in the case of the second shaft 7, on each side, the shaft piece being an insulator from the side plate 8 via a hawk-like end 10. 11 bite.

It is an axial sectional view of the distal end range of the forceps along line 1-1 of FIG. 2 showing an embodiment of the endoscopic forceps according to the present invention. FIG. 2 is a cross-sectional view taken along a line 2-2 that is folded in a multiple of the range of the axis of the embodiment shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Forceps 2 Pipe 3 Rod 4 1st holding part 5 2nd holding part 6 3rd axis | shaft (hinge)
7 Second axis (hinge)
8 Side plate 9 1st axis (hinge)
10 Hawk-shaped end 11 Insulator 12 Insulation sleeve

Claims (6)

  A long shaft (2, 3) comprising a pipe (2) and a rod (3) movable in the pipe direction with respect to the pipe (2); and a second shaft disposed at the distal end of the shaft (2, 3). An endoscopic forceps (1) having a forceps holding portion formed from one holding portion (4) and a second holding portion (5), wherein the swiveling holding portions (4, 5) are divided into three pieces. The hinge (6, 7, 9) is pivotally supported on an axis perpendicular to the pipe direction, and the first holding portion (4) is pivotally supported on the second holding portion (5) by the third hinge (6). And the first hinge (9) is pivotally supported on the rod (3), the second holding portion (5) is pivotally supported on the pipe (2) by the second hinge (7), and the third hinge (6) In range, one of the holding parts is the other holding at the fork opening of the fork-like end (10). In the type surrounding the pipe, the pipe (2) and the rod (3) can be connected to both poles of the bipolar high frequency power supply, and the pipe (2), the rod (3) and the holding part (4, 5) are electrically conductive. It is made of metal, the first hinge (9) and the second hinge (7) are configured to be conductive, the third hinge (6) is configured to be electrically insulating, and the hawk-like end (10 ) Is configured in the second holding part (5), and the fork opening of the fork part (10) has an insulator (11) surrounding the distal end of the first holding part (4) from the side. ) Is provided.   The forceps according to claim 1, wherein the insulator (11) is pivotally supported by the third and second hinges (6, 7).   The forceps according to claim 1, characterized in that the third hinge (6) has an integral insulative third shaft (6).   The forceps according to claim 3, wherein the third shaft (6) is made of ceramic.   The forceps according to claim 1, wherein the insulator (11) is made of ceramic.   The forceps according to claim 1, characterized in that an insulating sleeve (12) covering the inner surface of the pipe and a portion of the pipe end surface is provided in the distal end area of the pipe (2).

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