IP Library › Granted Patent US 12,458,454
Granted Patent B2
US 12,458,454 · App. 17/806,745 · Granted Nov 4, 2025

Gravity compensation of end effector arm for robotic surgical system

Inventors: Olivier Chappuis (Lutry, CH); Szymon Kostrzewski (Lausanne, CH)
Assignee: Globus Medical, Inc.
A61B34/30A61B34/70A61B34/25
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Quick Facts
Patent No.
US 12,458,454
App. No.
17/806,745
Granted
Nov 4, 2025
Kind
B2
Abstract

An end effector arm for use with a surgical navigation system includes a base configured to attach to an end effector coupler of a surgical robot arm and a mechanical linkage. The mechanical linkage includes a first end rotatably coupled to the base and a second end opposite the first end, the second end configured to be removably coupled to a handheld surgical tool. The end effector arm further includes a spring mechanism configured to impart a variable rotational force on the mechanical linkage based on an angle of rotation of the mechanical linkage with respect to the base.

Claims (50)

1 . An end effector arm for use with a robotic surgical system comprising:

a base configured to attach to an end effector coupler of a surgical robot arm;

a mechanical linkage including a first end rotatably coupled to the base and a second end opposite the first end, the second end configured to be removably coupled to a handheld surgical tool; and

a spring mechanism configured to impart a variable rotational force on the mechanical linkage based on an angle of rotation of the mechanical linkage, the spring mechanism comprising:

a spring including a first end and a second end, the first end of the spring coupled to one of the base and the first end of the mechanical linkage;

a cable including a first end and a second end, the first end of the cable coupled to the first end of the spring; and

a cam coupled to the other of the base and the first end of the mechanical linkage, the second end of the cable coupled to the cam, the cam including a cam guide configured to receive and maintain the second end of the cable within the cam guide during rotation of the mechanical linkage with respect to the base.

2 . The end effector arm of claim 1 , wherein rotation of the mechanical linkage in a first rotational direction with respect to the base at a linear rate causes the spring to deform at a non-linear rate.

3 . The end effector arm of claim 1 , wherein the spring comprises a compression coil spring.

4 . The end effector arm of claim 1 , wherein the spring comprises a tension coil spring.

5 . The end effector arm of claim 1 wherein the spring comprises a hydraulic spring.

6 . The end effector arm of claim 1 , wherein the spring comprises a pneumatic spring.

7 . The end effector arm of claim 1 , wherein the variable rotational force is sufficient to overcome a gravitational force on the second end of the end effector arm through a range of angles of rotation of the mechanical linkage with respect to the base.

8 . The end effector arm of claim 1 , wherein the variable rotational force is substantially equal to a gravitational force on the second end of the end effector arm through a range of angles of rotation of the mechanical linkage with respect to the base.

9 . The end effector arm of claim 1 , the mechanical linkage comprising:

a first link including the first end of the mechanical linkage and a second end; and

a second link including the second end of the mechanical linkage and a first end rotatably coupled to the second end of the first link.

10 . The end effector arm of claim 9 , wherein the variable rotational force is sufficient to overcome a first gravitational force on the first link and at least a portion of a second gravitational force on the second link through a range of angles of rotation of the mechanical linkage with respect to the base.

11 . The end effector arm of claim 1 , further comprising a locking mechanism attachable to the surgical tool and configured to selectively lock the surgical tool with respect to the base.

12 . A surgical tool guidance system comprising:

a robot arm configured to be positioned by a surgical robot, the robot arm including an end effector coupler;

an end effector arm including

a base configured to attach to the end effector coupler of the robot arm,

a mechanical linkage including a first end rotatably coupled to the base and a second end opposite the first end, and

a spring mechanism configured to impart a variable rotational force on the mechanical linkage based on an angle of rotation of the mechanical linkage; and

a handheld surgical tool configured to couple to the second end of the mechanical linkage,

wherein the spring mechanism comprising:

a spring including a first end and a second end, the first end of the spring coupled to one of the base and the first end of the mechanical linkage;

a cable including a first end coupled to a first end of the spring and a second end; and

a cam coupled to the other of the base and the first end of the mechanical linkage, the second end of the cable coupled to the cam, the cam including a cam guide configured to receive and maintain the second end of the cable within the cam guide during rotation of the mechanical linkage with respect to the base.

13 . The surgical tool guidance system of claim 12 , wherein rotation of the mechanical linkage in a first rotational direction with respect to the base at a linear rate causes the spring to deform at a non-linear rate.

14 . The surgical tool guidance system of claim 12 , wherein the variable rotational force is sufficient to overcome a gravitational force on the second end of the end effector arm through a range of angles of rotation of the mechanical linkage with respect to the base.

15 . The surgical tool guidance system of claim 12 , the mechanical linkage comprising:

a first link including the first end of the mechanical linkage and a second end; and

a second link including the second end of the mechanical linkage and a first end rotatably coupled to the second end of the first link.

16 . A surgical system comprising:

a tracking system configured to determine a pose of an anatomical structure that is to be engaged by a handheld surgical tool and to determine a pose of the surgical tool;

a surgical robot including

a robot base,

a robot arm connected to the robot base, the robot arm including an end effector coupler, and

at least one motor operatively connected to move the robot arm relative to the robot base, an end effector arm including

a base configured to attach to the end effector coupler of the robot arm,

a mechanical linkage including a first end rotatably coupled to the base and a second end opposite the first end, and

a spring mechanism configured to impart a variable rotational force on the mechanical linkage based on an angle of rotation of the mechanical linkage with respect to the base; and

a handheld surgical tool coupled to the second end of the mechanical linkage.

17 . The surgical system of claim 16 , the spring mechanism comprising:

a spring including a first end and a second end, the first end of the spring coupled to one of the base and the first end of the mechanical linkage;

a cable including a first end coupled to a first end of the spring and a second end; and

a cam coupled to the other of the base and the first end of the mechanical linkage, the second end of the cable coupled to the cam, the cam including a cam guide configured to receive and maintain the second end of the cable within the cam guide during rotation of the mechanical linkage with respect to the base.

18 . The surgical system of claim 17 , wherein rotation of the mechanical linkage in a first rotational direction with respect to the base at a linear rate causes the spring to deform at a non-linear rate.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jun 14, 2022
From: CHAPPUIS, OLIVIER; KOSTRZEWSKI, SZYMON
To: GLOBUS MEDICAL, INC.
Reel/Frame 060188/0682 →
Continuity (2)
Provisional Application 63212949 · Jun 21, 2021
Related Publication 20220401161A1 · Dec 22, 2022
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