Patent US2322526A successfully refreshed from Google Patents.
EP0243803A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Medical instrument for removing bone tissue
Assignee: Waldemar Link GmbH and Co KG
•
Filing: 1987-04-15
•
Granted: —
•
Expires: 2007-04-15
Abstract
Abstract There is provided an improved rongeur having a jaw mechanism comprised of a barrel member (29) having a honed cutting edge (47) on one extremity thereof and having a shaft member (49) located within and arranged for reciprocal motion. On the shaft member there is provided a plate member (57) attached at one extremity to trap bone against the cuting edge. A lever mechanism is provided having paired handle levers (13,15) joined by a pivot (19) and having the barrel and shaft member attached to the handle levers between the handle portion and the pivot. On the shaft member there is further provided a cavity (79) arranged to slide within the barrel progressively as the cutting operation proceeds, gradually drawing severed bone (85) within the capturing cavity. Stop surfaces (37, 63) are located in the cutting area at a position relative to the cuting edge (47, 71) to avoid direct force contact on the cutting edges when the shaft member is reciprocated to its full extent within the barrel member.
Inventors
- 👤 Daniel K. Farley
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 16:17
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/16; A61B17/1604; A61B17/1606; A61B17/1608; A61B17/1611
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
231 words
A medical instrument for cutting and removing bone comprising: a rigid barrel member having a first working area defined at one extremity thereof, said first working area including a first cutting surface and a flat stop surface; a shaft member positioned coaxially within said barrel member and arranged for reciprocal motion therein, said shaft member having a plate member mounted at one extremity thereof transverse to the axis of said shaft member and having a defined cavity proximate to said plate member, said plate member having a second working area comprising a second cutting surface and a second flat stop surface, said first and second flat stop surfaces being disposed in a face confronting relationship and making full contact when said shaft member is reciprocated to its full extent within said barrel member,for stopping the extent of reciprocation of said shaft member, said first and second cutting surfaces being disposed in a cutting relation and substantially avoiding direct force contact when said shaft member is reciprocated to its said full extent within said barrel member; lever means for reciprocally translating said shaft member within said barrel (a) to cause said plate to reciprocate with respect to said barrel trapping said bone between said first and second cutting surfaces and (b) to cause said cavity to reciprocate with respect to said barrel capturing bone severed by said cutting surfaces within said cavity.
Claim 2
Dependent Claim
231 words
A medical instrument for cutting and removing bone comprising: a rigid barrel member having a first working area defined at one extremity thereof, said first working area including a first cutting surface and a flat stop surface; a shaft member positioned coaxially within said barrel member and arranged for reciprocal motion therein, said shaft member having a plate member mounted at one extremity thereof transverse to the axis of said shaft member and having a defined cavity proximate to said plate member, said plate member having a second working area comprising a second cutting surface and a second flat stop surface, said first and second flat stop surfaces being disposed in a face confronting relationship and making full contact when said shaft member is reciprocated to its full extent within said barrel member,for stopping the extent of reciprocation of said shaft member, said first and second cutting surfaces being disposed in a cutting relation and substantially avoiding direct force contact when said shaft member is reciprocated to its said full extent within said barrel member; lever means for reciprocally translating said shaft member within said barrel (a) to cause said plate to reciprocate with respect to said barrel trapping said bone between said first and second cutting surfaces and (b) to cause said cavity to reciprocate with respect to said barrel capturing bone severed by said cutting surfaces within said cavity.
Claim 3
Dependent Claim
19 words
2 . A medical instrument according to claim 1 wherein said first cutting surface is a first cutting edge.
Claim 4
Dependent Claim
18 words
3 . A medical instrument according to claim 2 wherein said second cutting surface is a cutting edge.
Claim 5
Dependent Claim
81 words
A medical instrument according to claim 2 wherein said barrel member includes an outside face forming the outer surface of said barrel member and an inside face spaced from said outside face and defining the containing area of said barrel member, said first cutting surface including: a first cutting edge disposed on said outside face at a first portion of the extremity thereof; and a bevel surface extending between said first cutting edge and said inside face of said barrel member.
Claim 6
Dependent Claim
39 words
A medical instrument according to claim 4 wherein said first flat stop surface is formed of a flat surface extending between a second portion of the extremity of said outside face and said inside face of said barrel member.
Claim 7
Dependent Claim
17 words
A medical instrument according to claim 5, wherein said flat surface is orthogonal to said outside face.
Claim 8
Dependent Claim
40 words
A medical instrument according to claim 6 wherein said barrel member includes a uniform cross-sectional shape at said one extremity of said barrel member, said shape being somewhat rectangular formed of three straight sides and a protruding curved fourth side.
Claim 9
Dependent Claim
24 words
A medical instrument according to claim 7,wherein said first cutting edge is disposed on said protruding curved fourth cross section of said barrel member.
Claim 10
Dependent Claim
79 words
9 . A medical instrument accoraino to claim 3 wherein raid plate member includes an outside face forming the outer surface of said plate member and an inside face confronting said barrel member, said inside face includes a cavity formed into said plate member to form said second cutting surface, said second cutting surface including a second cutting edge formed by the intersection of a portion of said outside face and a portion of the surface defining said cavity.
References Cited (Backward Citations)
US4574803A
Cited
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.