Granted Patent
B2
US 12,672,871 · App. 19/247,514 · Granted Jul 7, 2026
Material combinations and processing methods for a surgical instrument
Inventors:
Andrew Krasts (San Clemente, CA); Darci Darnall (Rancho Santa Margarita, CA); Eric J. Weiss (San Clemente, CA); Timothy M. Hopkins (Rancho Santa Margarita, CA)
Assignee:
Applied Medical Resources Corporation
View Patent ↗
Loading inventors, assignments & file history…
Abstract
Surface preparation for sliding surfaces can enhance wear performance for surgical instruments such as surgical staplers which include reusable mechanisms that are used multiple times with single use reload cartridges. To reduce the potential for galling wear in a metal-to-metal sliding engagement, a combination of surface hardening, surface finish, and surface coatings can be applied to metallic components of a surgical instrument. Surface hardening techniques can allow further manufacturing operations such as welding without compromising the strength of the underlying metal substrate. With stainless steel metal substrates, as surface or case hardening techniques can reduce corrosion resistance, a surface coating can be applied to inhibit surface oxidation as well as provide a barrier to metal-to-metal contact. A further lubricious coating layer such as a bone wax coating layer can enhance galling resistance.
Claims (16)
1 . A surgical instrument comprising:
an end effector comprising:
a first jaw comprising a first channel formed therein, and
a second jaw pivotably coupled to the first jaw, the second jaw comprising
a second channel formed therein; and
a firing member longitudinally slidably engaged with the end effector to pivotably move the second jaw with respect to the first jaw and actuate the end effector, the firing member being slidably engageable with the first channel and the second channel;
wherein at least a portion of each of the first jaw, the second jaw, and the firing member that are in sliding engagement comprises a sliding surface configured to resist galling, the sliding surfaces each comprising a case hardened metallic substrate, a first surface coating layer overlying the metallic substrate, and a bone wax layer overlying the first surface coating layer.
2 . The surgical instrument of claim 1 , wherein the case hardened metallic substrate comprises a metallic substrate layer having a first hardness and a metallic surface layer having a second hardness greater than the first hardness.
3 . The surgical instrument of claim 2 , wherein the hardness of the metallic surface layer is within the range of approximately 45 HRC to approximately 70 HRC.
4 . The surgical instrument of claim 3 , wherein the hardness of the metallic surface layer is approximately 55 HRC.
5 . The surgical instrument of claim 2 , wherein the metallic surface layer has a surface roughness between approximately 25 μin and 75 μin.
6 . The surgical instrument of claim 5 , wherein the metallic surface layer has a surface roughness of approximately 50 μin.
7 . The surgical instrument of claim 1 , wherein the first surface coating layer comprises an oxidation inhibition material.
8 . The surgical instrument of claim 1 , wherein the first surface coating layer comprises a dry film PTFE coating.
9 . The surgical instrument of claim 1 , wherein at least one of the first jaw, the second jaw, and the firing member comprises a stainless steel material.
10 . The surgical instrument of claim 9 , wherein the stainless steel material comprises one of a grade 17-4 stainless steel and a grade 420 stainless steel.
Continuity (4)
Provisional Application
63107321
· Oct 29, 2020
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