IP Library › Granted Patent US 12,336,708
Granted Patent B2
US 12,336,708 · App. 18/269,340 · Granted Jun 24, 2025

Surgical instrument including a decoupling mechanism

Inventors: Jacob C. Baril (Norwalk, CT); Justin J. Thomas (New Haven, CT); Saumya Banerjee (Southington, CT)
Assignee: Covidien LP
A61B17/07207A61B2017/00477A61B2017/2903
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Quick Facts
Patent No.
US 12,336,708
App. No.
18/269,340
Granted
Jun 24, 2025
Kind
B2
Abstract

A surgical instrument includes a decoupling mechanism and a loading unit. The decoupling mechanism includes a driver coupling, an overstroke sled, a proximal driver, and a distal driver. The overstroke sled includes bosses configured to slidably engage slots of the driver coupling. The distal driver is coupled to a housing of the driver coupling for concomitant rotation therewith. A drive assembly of the loading unit is coupled to the distal driver such that rotation of the distal driver causes axial displacement of the drive assembly. The decoupling mechanism is transitionable between a first state, in which, rotation of the proximal driver of the decoupling mechanism rotates the driver coupling and the distal driver, thereby advancing the drive assembly, and a second state, in which, rotation of the proximal driver disengages the overstroke sled from the driver coupling to enable rotation of the overstroke sled relative to the driver coupling.

Claims (38)

1. A surgical instrument comprising:

a decoupling mechanism including:

a driver coupling having a housing defining a bore, an aperture in communication with the bore, and slots defined at one end of the bore, with the housing being rotatably movable;

an overstroke sled including bosses configured to be slidably received within the slots of the driver coupling;

a proximal driver coupled to an actuator of the surgical instrument, the proximal driver threadably coupled to the overstroke sled; and

a distal driver coupled to the housing of the driver coupling for concomitant rotation therewith; and

a loading unit including a drive assembly configured for axial displacement along a length of the loading unit, the drive assembly coupled to the distal driver of the decoupling mechanism such that rotation of the distal driver causes axial displacement of the drive assembly,

wherein the decoupling mechanism defines:

a first state, in which the bosses of the overstroke sled are received in the corresponding slots of the driver coupling such that rotation of the proximal driver imparts rotation to the driver coupling to advance the drive assembly; and

a second state, in which the bosses of the overstroke sled are disengaged from the corresponding slots of the driver coupling such that rotation of the proximal driver does not impart rotation to the driver coupling.

2. The surgical instrument according to claim 1 , wherein the driver coupling includes a spring in the bore of the driver coupling positioned to bias the overstroke sled towards the slots of the driver coupling.

3. The surgical instrument according to claim 1 , wherein the loading unit includes a knife assembly and an actuation sled coupled to the drive assembly of the loading unit for axial displacement with the drive assembly.

4. The surgical instrument according to claim 1 , wherein the distal driver is threadably coupled to the drive assembly of the loading unit such that rotation of the distal driver causes axial displacement of the drive assembly.

5. The surgical instrument according to claim 1 , wherein the overstroke sled includes a cylindrical body having an outer surface, the bosses diametrically disposed on the outer surface of the cylindrical body.

6. The surgical instrument according to claim 1 , wherein the slots of the driver coupling are diametrically arranged and extend along a portion of a length of the driver coupling.

7. The surgical instrument according to claim 1 , wherein the slots of the driver coupling are disposed adjacent the aperture of the driver coupling, the aperture dimensioned to receive the proximal driver.

8. The surgical instrument according to claim 1 , wherein the proximal driver, the overstroke sled, and the driver coupling are concentrically arranged.

9. The surgical instrument according to claim 1 , wherein the proximal and distal drivers are axially aligned.

10. A surgical instrument comprising:

a shaft assembly including a tubular shaft defining a lumen therethrough;

a decoupling mechanism movably disposed within the lumen of the tubular shaft, the decoupling mechanism including:

a driver coupling having a housing defining a bore, an aperture in communication with the bore, and slots defined at one end of the bore, with the housing being axially movable within the lumen;

an overstroke sled including bosses configured to slidably engage the slots of the driver coupling;

a proximal driver threadably coupled to the overstroke sled; and

a distal driver coupled to the housing of the driver coupling for concomitant axial displacement therewith; and

a loading unit including a drive assembly configured for axial displacement along a length of the loading unit, the drive assembly coupled to the distal driver such that the distal driver of the decoupling mechanism imparts axial displacement to the drive assembly,

wherein the decoupling mechanism defines:

a first state, in which the bosses of the overstroke sled are received in the corresponding slots of the driver coupling such that rotation of the proximal driver imparts axial displacement to the driver coupling to advance the drive assembly; and

a second state, in which the bosses of the overstroke sled are disengaged from the corresponding slots of the driver coupling such that rotation of the proximal driver does not impart axial displacement to the driver coupling.

11. The surgical instrument according to claim 10 , wherein the driver coupling includes a spring in the bore of the driver coupling positioned to bias the overstroke sled towards the slots of the driver coupling.

12. The surgical instrument according to claim 10 , wherein the loading unit includes a knife assembly and an actuation sled coupled to the drive assembly of the loading unit for axial displacement with the drive assembly.

13. The surgical instrument according to claim 10 , wherein the overstroke sled has a cylindrical body having an outer surface, the bosses diametrically disposed on the outer surface of the cylindrical body.

14. The surgical instrument according to claim 10 , wherein the slots of the driver coupling are diametrically arranged and extend along a portion of a length of the driver coupling.

15. The surgical instrument according to claim 10 , wherein the housing of the driver coupling further comprises a tab extending axially along a portion of a length of the driver coupling.

16. The surgical instrument according to claim 10 , wherein the proximal driver, the overstroke sled, and the driver coupling are concentrically arranged.

17. The surgical instrument according to claim 10 , wherein the proximal and distal drivers are axially aligned.

18. The surgical instrument according to claim 10 , wherein the housing of the driver coupling further comprises a tab aligned with the bosses of the overstroke sled.

19. The surgical instrument according to claim 10 , wherein when the drive assembly is in a distal position, rotation of the proximal driver advances the bosses of the overstroke sled through the slots of the driver coupling.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jun 23, 2023
From: BARIL, JACOB C.; THOMAS, JUSTIN J.; BANERJEE, SAUMYA
To: COVIDIEN LP
Reel/Frame 064040/0288 →
Continuity (2)
Provisional Application 63129784 · Dec 23, 2020
Related Publication 20240180554A1 · Jun 6, 2024
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