Forceps

Abstract

A forceps, in particular surgical forceps, having at least one handle and a pressure lever which is mounted in a pivotal manner relative to the handle and further having a jaw consisting of two jaw parts, one of which is provided on the handle. A lever arm is to be arranged between the handle and the pressure lever, wherein the lever arm has the second jaw part and pressure can be applied to the lever arm by the pressure lever.

Claims

1. A surgical forceps (1) comprising at least one handle part (2) and a pressure lever (3) which is mounted pivotably relative to the handle part, and further comprising a jaw consisting of two jaw parts (7.1, 7.2), wherein one of the jaw parts (7.1) is provided on the handle part (2) and wherein a lever arm (4) which has the second jaw part (7.2) and is pressurized by the pressure lever (3) is arranged between the handle part (2) and the pressure lever (3) and the lever arm (4) is mounted pivotably in relation to the handle part (2), wherein a rolling body (5) is arranged between the pressure lever (3) and the lever arm (4) and a force exerted on the pressure lever (3) is transmitted via the rolling body (5) to the lever arm (4), the rolling body (5) is guided in a slotted guide (9), the slotted guide (9) for guiding the rolling body (5) is provided in the handle part (2) and/or in a housing cover (8) and the lever arm (4) has a concave receptacle (20) for the rolling body (5) with an internal radius which is larger than an external radius of the rolling body (5) in the region of the rolling surfaces, wherein, by exerting a force on the pressure lever (3), the latter pivots about a fulcrum/pivot point (13.2) and exerts a force on the rolling body (5) which is guided in the slotted guide (9) in the direction of the lever arm (4), as a result of which the lever arm (4) begins to pivot about a fulcrum/pivot point (13.1) and the jaw part (7.2) of the lever arm (4) moves in the direction of the jaw part (7.1) of the handle part (2), and the mounting between handle part (2) and pressure lever (3) and between the handle part (2) and the lever arm (4) is a free mounting.

2. The forceps (1) as claimed in claim 1, wherein a fulcrum/pivot point (13.1) of the lever arm (4) is located on a side facing away from the jaw part (7.2).

3. The forceps (1) as claimed in claim 1, wherein a fulcrum/pivot point (13.2) of the pressure lever (3) is located on a side of the pressure lever (3) which faces the jaw parts (7.1, 7.2).

4. The forceps (1) as claimed in claim 1, wherein the handle part (2) is at least partially a part of a housing.

5. The forceps (1) as claimed in claim 1, wherein the handle part (2) has, at a jaw-side end, a concave receptacle (11.2) for the pressure lever (3).

6. The forceps (1) as claimed in claim 1, wherein the handle part (2) has, at an end facing away from the jaw, a concave receptacle (11.1) for the lever arm (4).

7. The forceps (1) as claimed in claim 1, wherein the handle part (2) has, at the jaw-side end, a recess which is suitable for receiving the lever arm (4).

8. The forceps (1) as claimed in claim 7, wherein the recess for receiving the lever arm (4) is designed as a closed channel (10) in the direction of a longitudinal axis (L) of the handle part (2).

9. The forceps (1) as claimed in claim 1, wherein the handle part (2) has a hook-in recess (12) which is suitable for receiving a spring (6).

10. The forceps (1) as claimed in claim 1, wherein the housing cover (8) is suitable for closing the housing.

11. The forceps (1) as claimed in claim 1, wherein the jaw parts (7.1, 7.2) are aligned substantially parallel to each other.

12. The forceps (1) as claimed in claim 1, wherein the jaw parts (7.1, 7.2) are suitable for receiving tool elements (16.1, 16.2) which are exchangeable.

13. The forceps (1) as claimed in claim 12, wherein at least one of the tool elements (16.1, 16.2) for cutting implants has receiving pins (18.1, 18.2) for receiving and securing the implant (15).

14. The forceps (1) as claimed in claim 13, wherein the tool elements (16.1, 16.2) for cutting implants (15) have spring pressers (17.1, 17.2).

15. The forceps (1) as claimed in claim 14, wherein the spring pressers (17.1, 17.2) are secured in the tool elements (16.1, 16.2) for cutting implants (15) by means of screws in the tool elements (16.1, 16.2), which screws secure the tool elements (16.1, 16.2) in the handle part (2) and/or lever arm (4).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Further advantages, features and details of the invention emerge from the following description of preferred exemplary embodiments and with reference to the drawings; in the latter

(2) FIG. 1 shows a typical embodiment of a forceps according to the invention with a closed jaw;

(3) FIG. 2 shows the exemplary embodiment according to FIG. 1 without the housing cover and with a closed jaw;

(4) FIG. 3 shows the exemplary embodiment according to FIG. 2 with an open jaw;

(5) FIG. 4 shows a side view of a handle part according to the invention of the forceps according to FIG. 1;

(6) FIG. 5 shows a view from the proximal side of the handle part according to FIG. 4;

(7) FIG. 6 shows a top view of the handle part according to FIG. 1;

(8) FIG. 7 shows a side view of a pressure lever according to the invention of the forceps according to FIG. 1;

(9) FIG. 8 shows a side view of a pressure lever according to the invention of the forceps according to FIG. 1;

(10) FIG. 9 shows a view from the proximal side of the lever arm according to FIG. 8;

(11) FIG. 10 shows a side view of a housing cover according to the invention of the forceps according to FIG. 1;

(12) FIG. 11 shows a view from the proximal side of the housing cover according to FIG. 10;

(13) FIG. 12 shows a typical exemplary embodiment of a surgical implant;

(14) FIG. 13 shows a top view of a tool element for the lever arm of a forceps according to the invention;

(15) FIG. 14 shows a front view of the tool element according to FIG. 13;

(16) FIG. 15 shows a side view of the tool element according to FIG. 13;

(17) FIG. 16 shows a top view of a tool element for the handle part of a forceps according to the invention;

(18) FIG. 17 shows a front view of the tool element according to FIG. 16;

(19) FIG. 18 shows a side view of the tool element according to FIG. 16;

(20) FIG. 19 shows a cutting pattern of the tool elements for an implant.

DETAILED DESCRIPTION

(21) FIG. 1 shows a typical embodiment of a forceps 1 according to the invention with a closed jaw. A forceps according to the invention comprises here a pressure lever 3 next to a handle part 2 with a jaw part 7.1. Said pressure lever 3 is mounted pivotably in relation to the handle part 2.

(22) FIG. 2 shows the forceps 1 according to FIG. 1 without a housing cover 8. A fulcrum/pivot point 13.2 about which the pressure lever 3, in a typical exemplary embodiment, turns or pivots is illustrated there. Said fulcrum/pivot point is located on that side of the pressure lever 3 which faces the jaw parts 7.1 and 7.2.

(23) Furthermore, a forceps according to the invention comprises a lever arm 4 with a second jaw part 7.2. In a typical exemplary embodiment, said jaw part is arranged between the handle part 2 and the pressure lever 3 and can be pressurized by the pressure lever 3.

(24) In FIG. 2, said lever arm 4 is illustrated in a state used in the forceps 1. It is furthermore shown that the lever arm 4 also has a fulcrum/pivot point 13.1 in relation to the handle part 2, about which the lever arm is mounted pivotably in relation to the handle part 2. Said fulcrum/pivot point 13.1 is located on that side of the lever arm 4 which faces away from the jaw part 7.2 in order to permit as high a transmission ratio as possible and, in addition, as parallel an arrangement as possible.

(25) Furthermore, it can be gathered from FIG. 2 and FIG. 3, which shows the forceps 1 according to the invention without a housing cover 8 in the open state, that both the mounting between the pressure lever 3 and the handle part 2 and the mounting between the lever arm 4 and the handle part 2 involve a free mounting. This makes easy dismantling of the forceps 1 by a user possible.

(26) Furthermore, it is shown in FIGS. 2 and 3 that a rolling body 5 is arranged between the pressure lever 3 and the lever arm 4. A compressive force exerted on the pressure lever 3 can be transmitted to the lever arm 4 via the rolling body 5.

(27) In order to transmit this force from the pressure lever 3 to the lever arm 4 in as loss-free a manner as possible via the rolling body 5, the rolling body is guided in a slotted guide 9. For this purpose, the slotted guide 9 is provided in the handle part 2 and/or the housing cover 8. The handle part 2 and the position of the slotted guide in the handle part 2 are illustrated in more detail in FIGS. 4 and 6. The housing cover 8 and the position of the slotted guide 9 in the housing cover are illustrated in more detail in FIGS. 10 and 11. Furthermore, the lever arm 4 has a concave receptacle 20 for the rolling body 5, the receptacle likewise contributing to as loss-free a transmission force as possible. In order to assist a rolling movement, the concave receptacle 20 for the rolling body has, in a typical exemplary embodiment, an internal radius which is larger than the external radius of the rolling body 5 in the region of the rolling surface.

(28) It is furthermore apparent from FIGS. 4, 5 and 6 that the handle part 2 at least partially has a housing which serves for receiving various individual parts of the forceps 1. The handle part 2 has a concave receptacle 11.2 on that side of the housing which faces the jaw part 7.1. The concave receptacle 11.2 is suitable for receiving the jaw-side end of the pressure lever 3 with the fulcrum/pivot point 13.2. In a typical exemplary embodiment, the concave receptacle 11.2 has an internal radius which is larger than the external radius of the pressure lever 3 about the fulcrum/pivot point 13.2.

(29) The handle piece 2 has a further concave receptacle 11.1 on that side of the housing which faces away from the jaw part 7.1. The receptacle 11.1 is suitable for receiving that end of the lever arm 4 which is opposite the jaw part 7.2 and has the fulcrum/pivot point 13.1. In a typical exemplary embodiment, the concave receptacle 11.1 has an internal radius which is larger than the external radius of the lever arm 4 about the fulcrum/pivot point 13.1.

(30) Furthermore, on that side of the housing which faces the jaw part 7.1, the handle part 2 has a recess which is suitable for accommodating the lever arm 4. In a typical exemplary embodiment, the recess for receiving the lever arm 3 is designed in the form of a closed channel 10 in the direction of a longitudinal axis L of the handle part 2. When the forceps 1 is assembled, the lever arm 4 is therefore introduced into the closed channel 10 from the jaw side.

(31) Furthermore, the handle part 2 has a hook-in recess 12 for a spring 6, which hook-in recess is suitable for bringing the forceps 1 from a use position with a closed jaw into a use position with an open jaw. The housing of the forceps 1, which housing is at least partially formed by the handle part 1, is, as illustrated in FIG. 1, closed by the housing cover 8. A fixed connection of the handle part to the housing cover can take place here via screws and/or a plug-in connection. The connection preferably takes place via screws which are not illustrated specifically in the figures.

(32) In an embodiment according to the invention of the forceps, the jaw parts 7.1 and 7.2 of the forceps 1 are also aligned virtually parallel to each other in the open state. Furthermore, the jaw parts 7.1 and 7.2 are suitable for receiving tool elements 16.1 and 16.2. In a typical exemplary embodiment, the tool elements 16.1 and 16.2 are exchangeable. The tool elements 16.1 and 16.2 are preferably inserts which are suitable for cutting surgical implants 15. FIG. 12 illustrates an embodiment of such an implant 15. A sufficiently high transmission ratio in order even to cut high-strength titanium implants is achieved by the arrangement of the fulcrum/pivot points 13.1 and 13.2.

(33) In an embodiment according to the invention of the forceps 1, the tool elements 16.1 and 16.2 are secured by screw connections in the receptacles 14.1 and 14.2 which are arranged in the jaw parts 7.1 and 7.2 of the handle part 2 and of the lever arm 4. In order neatly and effectively to sever the surgical implant 15, in a typical exemplary embodiment the cutting edges of the tool elements 16.1 and 16.2 are adapted to each other and to the surgical implant 15.

(34) Furthermore, as illustrated in FIGS. 16 to 18, at least one of the tool elements 16.1 and/or 16.2 has receiving pins 18.1 and 18.2 which prevent slipping of the surgical implant 15 and therefore secure the surgical implant 15. Furthermore, it can be ensured by the receiving pins 18.1 and 18.2 that the web width at the cut edge of the surgical implant 15 has adequate strength.

(35) In a typical exemplary embodiment, the tool elements 16.1 and 16.2 also have recesses which serve as receptacles 19.1 and 19.2 for spring pressers 17.1 and 17.2. The spring pressers 17.1 and 17.2 prevent the implant 15 from bending during cutting. This is illustrated in FIG. 19 which shows the cutting pattern for a typical exemplary embodiment.

(36) In order to enable the jaw of the forceps 1 to completely close, the spring pressers 17.1 and 17.2 are preferably produced from a firm, but elastic and therefore deformable silicone. In a typical exemplary embodiment, the spring pressers 17.1 and 17.2 are secured in the tool elements 16.1 and 16.2 by the screw connections which secure the tool elements 16.1 and 16.2 in the receptacles 14.1 and 14.2 of the jaw parts 7.1 and 7.2.

(37) The operation of the forceps 1 with tool elements 16.1 and 16.2 for cutting surgical implants 15 is illustrated below. The tool elements 16.1 and 16.2 for cutting surgical implants are illustrated in FIGS. 14 to 18. The associated cutting pattern is illustrated in FIG. 19:

(38) In order to cut an implant 15, the latter is inserted into the open jaw of the forceps 1. By means of the receiving pins 18.1 and 18.2, as ideal a positioning of the implant 15 as possible between the tool elements 16.1 and 16.2 in the jaw part of the forceps 1 is achieved.

(39) By exertion of a force on the pressure lever 3, the latter pivots about the fulcrum/pivot point 13.2 and exerts a force on the rolling body 5. The latter is thereby guided in the slotted groove 9 in the direction of the lever arm 4. As a result, the lever arm 4 begins to pivot about the fulcrum/pivot point 13.1. The jaw part 7.2 of the lever arm 4 thereby moves in the direction of the jaw part 7.1 of the handle part 2.

(40) The implant 15 is secured between the tool elements 16.1 and 16.2 by the spring pressers 17.1 and 17.2 and the receiving pins 18.1 and 18.2. By means of the compression, a force F then acts on the implant 15 and the latter is thereby severed at the designated cut edge.