Medical instrument

Patent metadata

Field	Value
Publication number	US-12303156-B2
Application number	US-202217966776-A
Country	US
Kind code	B2
Filing date	Oct 15, 2022
Priority date	Oct 16, 2021
Publication date	May 20, 2025
Grant date	May 20, 2025

Abstract

The invention relates to a medical instrument having a hollow shaft, whose proximal end can be connected to an operating unit and having a tool tip arranged at the distal end of the shaft having a tool arranged at the distal end of the tool tip, wherein the tool has two jaw parts, which can be pivoted relative to one another and wherein the jaw parts are pivoted via actuating elements, which are mounted so as to be axially displaceable in the shaft and which can be actuated on the proximal side via the operating unit and wherein the tool tip can be pivoted via a joint mechanism relative to the longitudinal axis of the shaft.
In order to provide a medical instrument, which ensures a uniform transmission of tensile and compressive forces even via the pivot region to the tool tip, it is proposed according to the invention that the pivotable jaw parts are each coupled via an articulated drive element to the distal end of an actuating element mounted so as to be axially displaceable in the shaft such that the articulated drive element spans the region of the joint mechanism between the distal end of the shaft and the proximal end of the tool tip.

First claim

The invention claimed is:

1. A medical instrument comprising: a hollow shaft having a proximal end and a distal end, whose proximal end can be connected to an operating unit and having a tool tip arranged on the distal end of the shaft having a tool arranged on the distal end of the tool tip, wherein the tool has two jaw parts, which can be pivoted relative to one another and wherein the jaw parts are pivoted via actuating elements, which are mounted so as to be axially displaceable in the shaft and which can be actuated on the proximal end via the operating unit, and wherein the tool tip can be pivoted via a joint mechanism relative to the longitudinal axis of the shaft, characterized in that the joint mechanism defines a region between the distal end of the shaft and a proximal end of the tool tip, wherein the pivotable jaw parts are each coupled via an articulated drive element to a distal end of an actuating element mounted so as to be axially displaceable in the shaft such that the articulated drive element spans the region of the joint mechanism between the distal end of the shaft and the proximal end of the tool tip, and wherein the articulated drive element includes a roller chain.

2. The medical instrument according to claim 1 , characterized in that the articulated drive element that includes a roller chain further comprises consisting of a plurality of chain links.

3. The medical instrument according to claim 2 , characterized in that each roller chain is mounted so as to be guided in the region of the joint mechanism between the distal end of the shaft and the proximal end of the tool tip via in each case one chain wheel pair consisting of two chain wheels.

4. The medical instrument according to claim 3 , characterized in that the chain wheels of each chain wheel pair are arranged in relation to one another such that a chain wheel from above and a chain wheel from below engage at the same chain link of the respective roller chain.

5. The medical instrument according to claim 2 , characterized in that each chain link of the roller chain consists of two outer tabs spaced apart from one another, each of the outer tabs defining an inner side, two pins connecting the outer tabs to one another and in each case an intermediate tab mounted on each of the two pins and arranged between the two outer tabs, wherein all pins protrude outwards over one of the outer tabs in the same direction forming an overhang at least on one side and all pins on the same side between the intermediate tab and the inner side of an outer tab have a thickened portion enlarging the diameter, via which the intermediate tab is spaced apart from the outer tab.

6. The medical instrument according to claim 5 , characterized in that a chain wheel of each chain wheel pair engages at the overhang of the pins over the outer side of the outer tabs and the other chain wheel of the same chain wheel pair engages at the thickened portion of the pins.

7. The medical instrument according to claim 5 , characterized in that all pins forming an overhang protrude outwards over the outer tabs on both sides.

8. The medical instrument according to claim 7 , characterized in that on the inner side of the proximal end of the tool tip for each roller chain guide tracks are designed for receiving in a guided manner the overhangs of the pins facing the inner side of the tool tip and protruding over the outer tabs.

9. The medical instrument according to claim 2 , characterized in that each roller chain is mounted in the region of the tool tip on the distal side so as to be articulated at a link chain, which is designed as a bolt chain and which is, for its part, mounted with its free end on one of the jaw parts of the tool.

10. The medical instrument according to claim 9 , characterized in that each bolt chain consists of tabs connected to one another in an articulated manner via bolts, wherein all bolts forming an overhang, protrude outwards over the tabs and towards an inner side of the tool tip.

11. The medical instrument according to claim 10 , characterized in that on the inner side of the tool tip guide tracks are designed for receiving in a guided manner the overhangs of the bolts protruding over the outer tabs.

12. The medical instrument according to claim 2 , characterized in that the shaft defines an outer surface and in that in the outer surface at the distal end of the shaft are designed grooves open outwards and offset by 180° in relation to one another for receiving in a guided manner the roller chains to pivot the jaw parts.

13. The medical instrument according to claim 1 , characterized in that a pivot plane (VE 1 ) stretched by pivoting the tool tip relative to the longitudinal axis of the shaft and a pivot plane (VE 2 ) stretched by pivoting the jaw parts relative to one another are arranged offset by 90° in relation to one another.

Assignees

• Storz Karl Se & Co Kg

Inventors

• Stefan Jochen

Classifications

• A61B2017/2901

  Details of shaft · CPC title

• A61B2017/2939

  Details of linkages or pivot points · CPC title

• A61B2017/2927

  the angular position of the head being adjustable with respect to the shaft · CPC title

• A61B17/00234

  for minimally invasive surgery (A61B17/0218, A61B17/0469, A61B17/12013, A61B17/1285, A61B17/29, A61B17/320016 take precedence) · CPC title

• A61B2017/2943

  Toothed members, e.g. rack and pinion · CPC title