Control handle with rotational cam mechanism for contraction/deflection of medical device

Patent metadata

Field	Value
Publication number	US-9682214-B2
Application number	US-201514981353-A
Country	US
Kind code	B2
Filing date	Dec 28, 2015
Priority date	Dec 3, 2010
Publication date	Jun 20, 2017
Grant date	Jun 20, 2017

Abstract

A medical device has a distal member with a configuration that can be changed by means of a control handle with a control assembly employing a rotational cam, a shaft, and a pulley, where the rotational cam is rotationally mounted on a portion of the control handle for rotation by a user. The rotational cam operates on the shaft to move it proximally or distally depending on the direction of rotation which in turn rotates the pulley to draw or release a puller wire to change the configuration of the distal member of the medical device. The shaft is oriented along a diameter of the control handle. The shaft has two ends which extends through two axial guide slots in the portion of the control handle to sit two opposing helical tracks formed on inner surface of the rotational cam. The guide slots are parallel with the longitudinal axis of the control handle and therefore maintain the shaft's diametrical orientation as the rotational cam is rotated to move the shaft proximally or distally. Actuation of the puller wire by means of the control assembly can result in a change of the distal member's configuration, including deflection, contraction and/or expansion.

First claim

What is claimed is:

1. A medical device comprising:
an elongated body;
a deflectable section distal the elongated body;
a member distal the deflectable section, the member having a configuration;
a control handle proximal the elongated body, the control handle having a longitudinal axis;
a deflection assembly comprising a deflection arm rotatable about a deflection axis generally transverse to the longitudinal axis of the control handle;
a control assembly comprising a rotational cam, a shaft, and a pulley, the rotational cam being in a circumferential relationship with a portion of the control handle and adapted for rotation about the longitudinal axis, the rotational cam having an inner surface with two opposing helical tracks, the portion of the control handle having two opposing linear guide slots extending in parallel with the longitudinal axis, the shaft extending along a diameter of the portion of the control handle generally perpendicular to the longitudinal axis, the shaft having two opposing ends, each of which extends through a respective guide slot and is received in a respective helical track, the pulley being mounted on the shaft;
first and second puller members responsive to rotation of the deflection assembly such that rotation of the deflection arm results in deflection of the deflectable section, and
a third puller member wrapped about the pulley,
wherein rotation of the rotational cam about the longitudinal axis by a user actuates movement of the shaft relative to the control handle along the longitudinal axis, thereby acting on the third puller member via the pulley to change the configuration of the member.

2. A medical device of claim 1 , wherein the member is contracted when the user rotates the rotational cam.

3. A medical device of claim 1 , wherein the member is expanded when the user rotates the rotational cam.

4. A medical device of claim 1 , wherein the shaft rotates about its longitudinal axis and translates along the longitudinal axis of the control handle while remaining generally perpendicular thereto when actuated by the rotational cam.

5. A medical device of claim 1 , wherein the rotational cam is outside of the portion of the control handle with which it is in a circumferential relationship.

6. A medical device of claim 1 , wherein rotation of the cam in one direction expands the member and rotation of the cam in an opposite direction contracts the member.

7. A medical device of claim 1 , wherein the ends of the shaft ride along the helical tracks as the cam is rotated.

8. A medical device of claim 1 , wherein the shaft remains generally perpendicular to the longitudinal axis as the cam is rotated.

9. A medical device of claim 1 , wherein the shaft moves within the linear guide slots as the cam is rotated.

10. A catheter of claim 1 , wherein the shaft remains generally perpendicular to the longitudinal axis as the cam is rotated.

11. A catheter of claim 1 , wherein the shaft moves within the linear guide slots as the cam is rotated.

12. A catheter of claim 1 , wherein the deflection assembly further comprises first and second pulleys in the deflection arm, at least a portion of the first puller member being wound on the first pulley, and at least a portion of the second puller member being wound on the second pulley.

13. A catheter comprising:
a catheter body;
a deflectable intermediate section distal the catheter body;
a mapping assembly distal the intermediate section, the mapping assembly having a generally circular portion;
a control handle proximal the catheter body and having a longitudinal axis, the control handle having:
a deflection control assembly comprising a deflection arm rotatable about a deflection axis generally transverse to the longitudinal axis of the control handle; and
a control assembly comprising a rotational cam, a shaft, and a pulley, the rotational cam being in a circumferential relationship with a portion of the control handle and adapted for rotation about the longitudinal axis, the rotational cam having an inner surface with two opposing helical tracks, the portion of the control handle having two opposing guide slots extending in parallel with the longitudinal axis, the shaft extending along a diameter of the portion of the control handle generally perpendicular to the longitudinal axis, the shaft having two opposing ends, each of which extends through a respective guide slot and is received in a respective helical track, the pulley being mounted on the shaft;

first and second puller members responsive to the deflection control assembly such that rotation of the deflection arm results in deflection of the intermediate section; and
a third puller member responsive to the rotational control assembly adapted to contract the generally circular portion of the mapping assembly.

14. A catheter of claim 13 , wherein a proximal end of the third puller member is anchored inside the control handle at a location distal of the shaft.

15. A catheter of claim 13 , wherein the rotational cam is outside of the portion of the control handle with which it is in a circumferential relationship.

16. A catheter of claim 13 , wherein the mapping assembly is contracted when the user rotates the rotational cam.

17. A catheter of claim 13 , wherein the mapping assembly is expanded when the user rotates the rotational cam.

18. A catheter of claim 13 , wherein the shaft rotates about its longitudinal axis and translates along the longitudinal axis of the control handle while remaining generally perpendicular thereto when actuated by the rotational cam.

19. A catheter of claim 13 , wherein rotation of the cam in one direction expands the distal member and rotation of the cam in an opposite direction contracts the distal member.

20. A catheter of claim 13 , wherein the ends of the shaft ride along the helical tracks as the cam is rotated.

21. A catheter of claim 13 , wherein the deflection control assembly further comprises first and second pulleys in the deflection arm, at least a portion of the first puller member being wound on the first pulley, and at least a portion of the second puller member being wound on the second pulley.

Assignees

• Biosense Webster Inc
• Biosense Webster Israel Ltd

Inventors

• Schultz Jeffrey W

Classifications

• A61M25/0147

  with movable mechanical means, e.g. pull wires · CPC title

• A61B18/1492

  having a flexible, catheter-like structure, e.g. for heart ablation (A61B18/1477 takes precedence) · CPC title

• A61B5/6852

  Catheters · CPC title

• A61M25/0136 Primary

  Handles therefor · CPC title

• A61M25/0052

  Localized reinforcement, e.g. where only a specific part of the catheter is reinforced, for rapid exchange guidewire port · CPC title