Locking mechanism for a medical device

Patent metadata

Field	Value
Publication number	US-2016228682-A1
Application number	US-201615098101-A
Country	US
Kind code	A1
Filing date	Apr 13, 2016
Priority date	Sep 25, 2009
Publication date	Aug 11, 2016
Grant date	—

Abstract

A locking mechanism for a medical device to selective lock a first elongate member from longitudinal movement relative to a second elongate member of the medical device. The locking mechanism includes a flexible tubular member disposed in a bore of a handle assembly of the medical device, and an actuator, such as a cam member having a cam or eccentric surface. Pivotable movement of the actuator from a first position to a second position compresses or deforms the flexible tubular member against the first elongate member to lock the first elongate member from longitudinal movement relative to the handle assembly.

First claim

What is claimed is:

1 . A medical device assembly comprising:
an elongate tubular member having a proximal end and a distal end; a handle assembly coupled to the proximal end of the elongate tubular member, the handle assembly including a housing having a bore extending therethrough and a locking mechanism, the locking mechanism comprising:
a flexible member positioned in the bore of the housing; and
an actuator pivotably attached to the housing about a pivot axis, the actuator being pivotable between a first position and a second position; and
an elongate member extending along the flexible member, the elongate member selectively longitudinally movable with respect to the housing of the handle assembly; wherein in the first position the elongate member is longitudinally movable along the flexible member and in the second position longitudinal movement of the elongate member is restrained by the flexible member; and wherein the bore of the housing includes a first portion having a first diameter and a second portion having a second diameter greater than the first diameter, wherein the flexible member is positioned in the second portion of the bore.

2 . The medical device assembly of claim 1 , wherein the flexible member is a tubular member having a lumen extending therethrough, and wherein the elongate member extends through the lumen of the flexible member.

3 . The medical device assembly of claim 2 , wherein the lumen of the flexible member has a diameter which is substantially equal to the first diameter of the first portion of the bore of the housing.

4 . The medical device assembly of claim 2 , wherein in the first position the lumen of the flexible member has a first diameter and wherein in the second position the lumen of the flexible member has a second diameter less than the first diameter.

5 . The medical device assembly of claim 4 , wherein the flexible member includes a longitudinal slit extending through a wall of the flexible member, the slit having a width, wherein in the first position the width of the slit is greater than the width of the slit in the second position.

6 . The medical device assembly of claim 1 , wherein the flexible member is deformed against the elongate member in the second position.

7 . The medical device assembly of claim 1 , wherein the elongate member extends along a longitudinal axis;
wherein the actuator includes an eccentric surface having a variable distance from the pivot axis; and wherein in the first position the eccentric surface of the actuator is located a first distance from the longitudinal axis and in the second position the eccentric surface of the actuator is located a second distance from the longitudinal axis which is less than the first distance.

8 . The medical device assembly of claim 7 , wherein in the second position, the eccentric surface of the actuator is engaged against the flexible member, forcing the flexible member against the elongate member.

9 . The medical device assembly of claim 7 , wherein in the second position, the eccentric surface of the actuator actuates a pushing member against the flexible member, thereby forcing the flexible member against the elongate member.

10 . The medical device assembly of claim 1 , wherein the locking mechanism includes a detent which engages a portion of the housing in the second position, wherein engagement of the detent restricts pivotable movement of the actuator to the first position.

11 . The medical device assembly of claim 10 , wherein the housing of the handle assembly includes a projection extending into an arcuate opening of the actuator, and the detent is a tang of the actuator which engages the projection of the housing.

12 . A medical catheter assembly comprising:
an outer tubular member having a proximal end, a distal end and a lumen extending therethrough; an inner tubular member disposed in the lumen of the outer tubular member and extending distally therefrom; a handle assembly coupled to the proximal end of the outer tubular member, the handle assembly including a housing having a proximal end and a distal end, the housing including a bore extending therethrough; and an elongate member coupled to the inner tubular member and extending proximally therefrom through the lumen of the outer tubular member into the bore of the housing; wherein the handle assembly includes a locking mechanism including an actuator actuatable between a first position and a second position, and a flexible member positioned in the bore of the housing with the elongate member extending along the flexible member, the flexible member configured to frictionally engage the elongate member; and wherein in the first position the elongate member and the inner tubular member are longitudinally movable relative to the outer tubular member and the handle assembly, and in the second position the actuator forces the flexible member against the elongate member to restrain longitudinal movement of the elongate member relative to the handle assembly.

13 . The medical catheter assembly of claim 12 , wherein in the first position there is a first coefficient of friction between a surface of the flexible member and an outer surface of the elongate member, and in the second position there is a second coefficient of friction between the surface of the flexible tubular member and the outer surface of the elongate member, the second coefficient of friction being greater than the first coefficient of friction.

14 . The medical catheter assembly of claim 12 , wherein the flexible member is a tubular member having a lumen extending therethrough, and wherein the elongate member extends through the lumen of the flexible member.

15 . The medical catheter assembly of claim 12 , wherein the elongate member extends along a longitudinal axis;
wherein the actuator is pivotably attached to the housing about a pivot axis; wherein the actuator includes an eccentric surface having a variable distance from the pivot axis; and wherein in the first position the eccentric surface of the actuator is located a first distance from the longitudinal axis and in the second position the eccentric surface of the actuator is located a second distance from the longitudinal axis which is less than the first distance.

16 . The medical catheter assembly of claim 15 , wherein in the second position, the eccentric surface of the actuator exerts a force against the flexible member, forcing the flexible member against the elongate member.

17 . A method of selectively locking an elongate member of a medical device with respect to a handle assembly of the medical device, the method comprising:
providing a handle assembly including a housing having a bore extending through the housing, the bore of the housing including a first portion having a first diameter and a second portion having a second diameter greater than the first diameter, a flexible member positioned in the second portion of the bore of the housing, and an actuator movably attached to the housing between a first position and a second position; positioning an elongate member along the flexible member, the elongate member longitudinally movable with respect to the housing of the handle assembly with the actuator in the first position; and actuating the actuator to the second position, wherein in the second position the flexible member is compressed against the elongate member to restrain longitudinal movement of the elongate member with respect to the housing of the handle assembly.

18 . The method of claim

Assignees

• Boston Scient Scimed Inc

Inventors

• Graham Jacob
• Derosier Stephen
• Bean Jeffrey
• Golden John

Classifications

• A61M25/01

  Introducing, guiding, advancing, emplacing or holding catheters (A61M25/10 takes precedence) · CPC title

• A61M25/0097

  characterised by the hub (connectors A61M39/10) · CPC title

• A61M2025/09125

  Device for locking a guide wire in a fixed position with respect to the catheter or the human body · CPC title

• A61M25/0105

  Steering means as part of the catheter or advancing means; Markers for positioning (systems for detection of markers A61B) · CPC title

• A61M2025/0681

  Systems with catheter and outer tubing, e.g. sheath, sleeve or guide tube · CPC title