Endoscopic rongeur-type surgical instrument

• US 20040122433A1
• Filed: 01/23/2004
• Published: 06/24/2004
• Est. Priority Date: 02/06/2001
• Status: Abandoned Application

• Current Assignee: Soprane
• Original Assignee: Soprane
• Inventors: Riou, Lionel, Loubens, Thierry, Garin, Christophe
• Application Number:
  US10/467,314
• Publication Number:
  US 20040122433A1
• Time in Patent Office: Days
• US Class Current: 606/83
• CPC Class Codes: A61B 17/1611 the two jaw elements being integral with respective elongate shaft elements
• CPC Class Codes: A61B 2010/0225 for taking multiple samples
• CPC Class Codes: A61B 2017/0046 with a releasable handle; with handle and operating part separable for prosthetic joint-implanting tools A61F2/4603
• CPC Class Codes: A61B 2017/2916 pins in guiding slots
• CPC Class Codes: A61B 2017/2919 details of linkages or pivot points
• CPC Class Codes: A61B 2090/0813 Accessories designed for easy sterilising, i.e. re-usable

Abstract

The invention relates to a rongeur-type surgical instrument comprising a fixed handle (2) which receives an elastically-loaded movable handle (4) around an axis of rotation (5), a fixed clamping jaw (3), one end of which is solidly connected to a cutting jaw, (25) and a movable clamping jaw (6). The movable clamping jaw moves in translation on the fixed clamping jaw (3) when the movable handle (4) pivots around the axis of rotation (5) in such a way that the sharp edges (45) of the free end thereof co-operate with the sharp edges (27) of the fixed clamping jaw (3). Said movable clamping jaw (6) comprises an internal channel (44) which stores the fragments of cut bone tissue (56), while the fixed clamping jaw (3) comprises transfer means (30) which co-operate with the movable clamping jaw (6) in order to enable the fragments of cut bone tissue (56) to penetrate a space (41) in the movable clamping jaw (6) which is disposed in the extension of the channel (44).

Claims

1. A surgical instrument of the rongeur type comprising a fixed handle (2) receiving, about an axis of rotation (5), an elastically loaded moving handle (4), a fixed jaw (3) secured at one of its ends to a nose (25) with a cutting profile and a moving jaw (6) guided in translation on the fixed jaw (3) as the moving handle (4) pivots about the axis of rotation (5) so that its free end with cutting edges (45) collaborate with those (27) of the fixed jaw (3), characterized in that the moving jaw (6) comprises an internal passage (44) forming a store for the cut pieces of bone tissue (56), while the fixed jaw (3) comprises transfer means (30) which collaborate with the moving jaw (6) to allow the cut pieces of bone tissue (56) to enter a space (41) belonging to the moving jaw (6) and situated in the continuation of the passage (44).

2. The surgical instrument as claimed in claim 1, characterized in that the moving jaw (6) consists of a cylindrical tube (40) comprising an open internal bore (41), of a continuation (42) and of a ring (50) which is formed of a first part (51) with a knurled surface and of a second part (52) provided with at least one oblong housing (53) in which a drive spindle (54) is fixed.

3. The surgical instrument as claimed in claim 1, characterized in that the fixed jaw (3) consists of a cylindrical tube (23) comprising an internal bore (33) of a continuation (24) in the form of an elongate mounting plate having a U-shaped solid cross section and of a cylindrical shoulder (37) secured to a stop (38).

4. The surgical instrument as claimed in claim 1, characterized in that the transfer means consist of a shoulder (30) secured to the fixed jaw (3) and which enters the space (41) of the moving jaw (6) in the operating position.

5. The surgical instrument as claimed in claim 4, characterized in that the shoulder (30) comprises an elongate part (34) which is arranged inside the bore (33) and above the internal wall (35) of the cylindrical tube (23) of the fixed jaw (3) so as to delimit a slot (55) of curved profile in which the wall of the cylindrical tube (23) of the moving jaw (6) slides in the operating position.

6. The surgical instrument as claimed in claim 2, characterized in that the continuation (42) comprises, over its entire length, an internal passage (44) in the shape of an inverted U with an open base of a cross section increasing from the edge 45 as far as the shoulder 48.

7. The surgical instrument as claimed in claim 2, characterized in that the continuation (42) at its free end comprises inclined and opposed edges (45) which are beveled.

8. The surgical instrument as claimed in claim 2, characterized in that the passage (44) comprises, near the inclined edges (45), opposed ribs (46) separated by a slit (47) so as to constitute a slideway.

9. The surgical instrument as claimed in claim 2, characterized in that the ring (50) comprises oblong housings (53) which are made parallel to the longitudinal axis of the moving jaw (6), while drive spindles (54) are fixed in each housing are directed in a direction perpendicular to the longitudinal axis so as to collaborate with the moving handle (4) for driving the translation of the moving jaw (6).

10. The surgical instrument as claimed in claim 9, characterized in that the oblong housings (53) are uniformly distributed around the periphery of the ring (50).

11. The surgical instrument as claimed in claim 2, characterized in that the ring (50) comprises just one oblong housing (53) and just one drive spindle (54) while the tube (40) is free to rotate about the ring (50), allowing the moving jaw (6) to automatically position itself according to the angular indexing of the fixed jaw (3) relative to the fixed handle (2).

12. The surgical instrument as claimed in claim 3, characterized in that the continuation (24) comprises an upper edge (28) which has, at the shoulder (30) and inside the tube (23), lateral stops (31) delimiting, on the central axis of the fixed jaw (3), a groove (32) for the longitudinal guidance of the moving jaw (6) in the operating position.

13. The surgical instrument as claimed in claim 3, characterized in that the continuation (24) comprises, at its free end, a nose (25) which in its thickness has a hollowing (26) delimiting opposed and beveled edges (27).

14. The surgical instrument as claimed in claim 3, characterized in that the continuation (24) comprises an upper edge (28) provided, near the nose (25), with a T-shaped tenon (29) allowing longitudinal guidance of the moving jaw (6) in the operating position.

15. The surgical instrument as claimed in claim 5, characterized in that the wall (35) of the cylindrical tube (23) of the fixed jaw (3) is pierced with a hole (36) which communicates with the slot (55).

16. The surgical instrument as claimed in claim 3, characterized in that the tube (23) comprises, at the shoulder (37), a nut (39) provided in its internal part with a shoulder (49) which collaborates with the stop (38) to allow the fixed jaw (3) to be fixed indexed in a given angular position on the fixed handle (2).

17. The surgical instrument as claimed in claim 1, characterized in that the fixed handle (2) comprises fixing means that allow the fixed jaw (3) to be arranged in different angular positions about its longitudinal axis.

18. The surgical instrument as claimed in claim 17, characterized in that the fixing means consist of a cylindrical sleeve tube (8) comprising at one of its ends a threaded collar (15) delimiting a shoulder (16) in which cut-outs (17) are made, at least one of which collaborates, according to the determined position, with a stop (38) secured to the fixed jaw (3), while the threaded collar (15) collaborates with a tightening nut (39) for immobilizing the fixed jaw (3) on the fixed handle (2).

19. The surgical instrument as claimed in claim 18, characterized in that the cylindrical sleeve tube (8) comprises an internal bore (9) open at both ends and communicating with a slit (10) of conical profile formed in the thickness of the upper part of the fixed handle (2).

20. The surgical instrument as claimed in claim 19, characterized in that the slit (10) is designed to accommodate a mounting plate (20) of the moving handle (4) which opens into the internal bore (9) of the sleeve tube (8) so as to be able to collaborate with one of the drive spindles (54) that drive the moving jaw (6).

21. The surgical instrument as claimed in claim 20, characterized in that the mounting plate (20) of the moving handle (4) comprises an oblong slit (22) intended to accommodate one of the spindles (54) of the moving jaw in the operating position.