Reversible multiple use disposable torque limiting device

Patent metadata

Field	Value
Publication number	US-9868194-B2
Application number	US-201615065722-A
Country	US
Kind code	B2
Filing date	Mar 9, 2016
Priority date	Nov 30, 2011
Publication date	Jan 16, 2018
Grant date	Jan 16, 2018

Abstract

A torque limiting device is disclosed, comprising a hollow body with an open proximal end and open distal end forming a handle, an internal wall bisecting said hollow body into a first and a second section on one side having torque limiting movable ramps, a rotatable head section affixed movably to the internal wall with bumps extended from the backside thereof, and a tool mounted to the front side whereby when rotated in a torque limiting direction, the at least one bump stop will pass over the ramp and the application of sufficient torque requirement of said device will depress the ramp, and allow the bump stop to pass over.

First claim

What is claimed is:

1. A disposable torque limiting device comprising:
a hollow body with an open proximal end and an open distal end forming a handle, said hollow body further comprising an internal wall dividing said hollow body into a front section and a back section, at least one torque limiting movable ramp integrally formed on a front side of the internal wall; the torque limiting movable ramp pivotally connected to the internal wall via a living hinge and having an elongated ramp body projecting at an incline away from the internal wall;
a channel hole formed through said internal wall fluidly connecting said front section and said back section;

a head having a front side with a nose extended therefrom which has a tool mounted therein;
said head having an annular back side surface located between an outermost annular wall sized to movably fit inside the front section of the hollow body and an innermost cylindrical peg wall, the innermost cylindrical peg wall having a catch feature formed thereon, the annular back side surface containing at least one bump stop protruding therefrom;
a plug having a base sized to fit inside the back section of the hollow body but sized to be larger than the channel hole, the plug having an extended latch protruding from the base that is sized and shaped to fit through the channel hole and fasten to the catch feature on the innermost cylindrical peg wall to secure the tool and the head in the front section;
whereby when the handle is twisted relative to the tool, the at least one torque limiting movable ramp on the hollow body will rotate toward the at least one bump stop on the head to an engagement point where the bump stop contacts the at least one torque limiting movable ramp, at the engagement point, additional twisting of the handle will result in a twisting of the tool with a torque limited at level where the at least one bump stop pivotally deflects the elongated ramp body toward the internal wall allowing the bump stop to rotate past the at least one generally torque limiting movable ramp.

2. The device of claim 1 , wherein the at least one torque limiting movable ramp is constructed out of a plastic material with memory.

3. The device of claim 2 wherein the least one torque limiting movable ramp will return to its inclined position after the bump stop pivotally deflects the elongated ramp body toward the internal wall via spring action of the plastic material with memory.

4. The device of claim 3 wherein the least one torque limiting movable ramp requires an application of a predetermined actuation force to cause the elongated ramp body to pivotally deflect.

5. The device of claim 4 wherein when a life cycle limit of the living hinge is exceeded the elongated ramp body will become displaced by the application of less than the actuation force.

6. The device of claim 5 wherein when a life cycle limit of the living hinge is exceeded the elongated ramp body may no longer return to its inclined position away from the internal wall.

7. A torque limiting system comprising:
a hollow body divided by an internal wall into a front section and a back section;
at least one torque limiting movable ramp integrally formed on a front side of the internal wall; the torque limiting movable ramp pivotally connected to the internal wall via a living hinge and having an elongated ramp body projecting at an incline away from the internal wall;
a channel hole formed through said internal wall fluidly connecting said front section and said back section;
a head having a front side with a nose extended therefrom which has a tool mounted therein;
said head having an annular back side surface located between an outermost annular wall sized to movably fit inside the front section of the hollow body and an innermost cylindrical peg wall, the innermost cylindrical peg wall having a catch feature formed thereon, the annular back side surface containing at least one bump stop protruding therefrom;
a plug having a base sized to fit inside the back section of the hollow body but sized to be larger than the channel hole, the plug having an extended latch protruding from the base that is sized and shaped to fit through the channel hole and fasten to the catch feature on the innermost cylindrical peg wall to secure the tool and the head in the front section;
whereby when the handle is twisted relative to the tool, the at least one torque limiting movable ramp on the hollow body will rotate toward the at least one bump stop on the head to an engagement point where the bump stop contacts the at least one torque limiting movable ramp, at the engagement point, additional twisting of the handle will result in a twisting of the tool with a torque limited at level where the at least one bump stop pivotally deflects the elongated ramp body toward the internal wall allowing the bump stop to rotate past the at least one generally torque limiting movable ramp.

8. The device of claim 7 wherein the at least one torque limiting movable ramp is integral to the internal wall and is constructed out of a plastic material with memory.

9. The device of claim 8 wherein the least one torque limiting movable ramp will return to its inclined position after the bump stop pivotally deflects the elongated ramp body toward the internal wall via spring action of the plastic material with memory.

10. The device of claim 9 wherein the least one torque limiting movable ramp requires an application of a predetermined actuation force to cause the elongated ramp body to pivot pivotally deflect.

11. The device of claim 10 wherein when a life cycle limit of the living hinge is exceeded the elongated ramp body will become displaced by the application of less than the actuation force.

12. The device of claim 11 wherein when a life cycle limit of the living hinge is exceeded the elongated ramp body may no longer return to its inclined position away from the internal wall.

Assignees

• Eca Medical Instr

Inventors

• Ivinson David
• Nino John
• Norsworthy Gary

Classifications

• A61B2017/0023

  disposable · CPC title

• A61B2017/0046

  with a releasable handle; with handle and operating part separable · CPC title

• A61B2017/00871

  polymeric · CPC title

• F16D43/2026

  with a plurality of axially moving parts · CPC title

• F16D7/046

  with a plurality of axially moving parts · CPC title