EP0399700A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Locking mechanism for a surgical fastener apparatus
Assignee: United States Surgical Corp
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Filing: 1990-05-10
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Granted: —
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Expires: 2010-05-10
Abstract
Abstract An improved surgical stapling apparatus containing a locking mechanism to prevent reactuation of the apparatus, the locking mechanism comprising a resilient clip (128) having a hook (129) which is engagable with a locking notch (111) on the cam bar retainer (110). The resilient clip is initially held in a non-engagable position by means of a movable chock (130). When the stapler is actuated for the first time, the cam bar retainer pushes the chock into a subsequent position where the chock no longer blocks the resilient clip. The resilient clip then moves to a position where the hook is engagable with the locking notch. Once the cam bar retainer is retracted it can no longer be reactuated.
Inventors
- 👤 Thomas M. Tompkins
- 👤 Dominic F. Presty
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 12:37
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/068; A61B17/072; A61B17/07207
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
169 words
A loading unit for a surgical fastening apparatus, said loading unit comprising: a) a stationary carrier (120) receivable into said frame; b) a pusher assembly (110, 140) slidably mounted within said stationary carrier, said pusher assembly comprising at least one cam bar (150a, b) a cam bar retainer (110) for mounting the cam bar, said cam bar retainer having a locking notch (111), and a thrust knob (140) attached to the cam bar retainer; c) a resilient locking clip (128) fixed to the stationary carrier and having a hook (129), said locking clip being adapted to be resiliently urged from a first position wherein said hook is non-engagable with said locking notch, to a second position wherein said hook is engagable with said locking notch; and d) a blocking means (130) adapted to be movable from a location wherein said blocking means holds said locking clip in the non-engagable first position, to a location wherein said blocking means does not hold said locking clip in the non-engagable first position.
Claim 2
Dependent Claim
169 words
A loading unit for a surgical fastening apparatus, said loading unit comprising: a) a stationary carrier (120) receivable into said frame; b) a pusher assembly (110, 140) slidably mounted within said stationary carrier, said pusher assembly comprising at least one cam bar (150a, b) a cam bar retainer (110) for mounting the cam bar, said cam bar retainer having a locking notch (111), and a thrust knob (140) attached to the cam bar retainer; c) a resilient locking clip (128) fixed to the stationary carrier and having a hook (129), said locking clip being adapted to be resiliently urged from a first position wherein said hook is non-engagable with said locking notch, to a second position wherein said hook is engagable with said locking notch; and d) a blocking means (130) adapted to be movable from a location wherein said blocking means holds said locking clip in the non-engagable first position, to a location wherein said blocking means does not hold said locking clip in the non-engagable first position.
Claim 3
Dependent Claim
19 words
Apparatus as claimed in Claim 1 wherein the resilient locking clip is an integral part of the stationary carrier.
Claim 4
Dependent Claim
23 words
Apparatus as claim in Claim 1 or 2 wherein the locking notch is positioned on the distal end of the cam bar retainer.
Claim 5
Dependent Claim
22 words
Apparatus as claimed in Claim 1, 2 or 3 wherein the hook is positioned at the distal end of the resilient clip.
Claim 6
Dependent Claim
18 words
Apparatus as claimed in Claim 1, 2, 3 or 4 wherein the cam bar retainer has a backslope.
Claim 7
Dependent Claim
18 words
Apparatus as claimed in any one of the preceding claims wherein the blocking means comprises a slidable chock.
Claim 8
Dependent Claim
16 words
Apparatus as claimed in Claim 6 wherein the chock is slidably mounted on a cam bar.
Claim 9
Dependent Claim
18 words
Apparatus as claimed in Claim 6 or 7 wherein the cam bar retainer is engagable with said chock.
Claim 10
Dependent Claim
24 words
Apparatus as claimed in Claim 6, 7 or 8 wherein the chock is in slidable contact with the interior surface of the stationary carrier.
Claim 11
Dependent Claim
18 words
Apparatus as claimed in Claim 9 wherein the interior surface of the stationary carriers has a lubricant coating.
Claim 12
Dependent Claim
32 words
Apparatus as claimed in Claim 10 wherein the lubricant has sufficient viscosity to be substantially displaced by the chock when said chock is moved from the initial position to the subsequent position.
Claim 13
Dependent Claim
20 words
Apparatus as claimed in any one of the preceding claims and including a knife mounted to the cam bar retainer.
Claim 14
Dependent Claim
33 words
Surgical fastening apparatus including a loading unit as claimed in any one of the preceding claims, the loading unit providing a single use locking mechanism to prevent reactuation of the surgical fastening apparatus.
References Cited (Backward Citations)
US3079606A
Cited
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