EUS fiducial needle stylet handle assembly

Patent metadata

Field	Value
Publication number	US-10123848-B2
Application number	US-201514950184-A
Country	US
Kind code	B2
Filing date	Nov 24, 2015
Priority date	Dec 3, 2014
Publication date	Nov 13, 2018
Grant date	Nov 13, 2018

Abstract

A safety-catch mechanism for a fiducial-deployment system, having a main handle, a stylet, a guide sleeve, and a grasping handle for moving adjacent to the guide sleeve. One of the guide sleeve or grasping handle has a threaded surface, and the other has one or more protruding tabs to rotatably engage between the threads. A safety-catch structure is located between the threads and configured to resist rotation of the grasping handle when one of the protruding tabs contacts this structure, unless the user applies a threshold amount of mechanical force to overcome this safety-catch structure, permitting distal movement of the stylet.

First claim

We claim:

1. A safety-catch mechanism for a fiducial-deployment system, comprising:
an elongate first handle member defining a central longitudinal axis and handle lumen;
a guide sleeve proximal to the first handle member;
a grasping handle proximal to the guide sleeve and engaged movably adjacent to the guide sleeve;
where one of the guide sleeve or the grasping handle includes a threaded surface on a portion thereof;
where the other of the guide sleeve or the grasping handle includes one or more protruding tabs on a portion thereof constructed and dimensioned to engage rotatably between threads of the threaded surface;
a stylet connected to the grasping handle and extending through at least a portion of the guide sleeve and the first handle member, along or generally aligned with the central longitudinal axis; and
at least one safety-catch structure disposed between threads of the threaded surface.

2. The safety-catch mechanism of claim 1 , wherein the at least one safety-catch structure is constructed and dimensioned to resist distal stylet motion when one of the protruding tabs contacts the at least one safety-catch structure and less than a threshold amount of mechanical force is applied to the grasping handle, and where said construction provides that mechanical force exceeding said threshold moves the one of the protruding tabs past the at least one safety-catch structure, thereby permitting further distal stylet movement.

3. The safety-catch mechanism of claim 1 , further comprising a fiducial deployment needle retaining a plurality of fiducials for distal deployment in a controlled serial manner, where the stylet is disposed through a lumen of said needle and is effectively but overcomeably prevented from contacting the fiducials by the safety-catch structure.

4. The safety-catch mechanism of claim 1 , wherein the at least one safety-catch structure is a bump detent.

5. The safety-catch mechanism of claim 4 , wherein the bump detent is a geometric shape selected from the group consisting of a circular face, a spherical face, a rectangular face, and a chamfered face.

6. The safety-catch mechanism of claim 1 , wherein the grasping handle includes a thumb ring.

7. The safety-catch mechanism of claim 6 , wherein the thumb ring comprises a soft-touch overmold.

8. The safety-catch mechanism of claim 1 , wherein the threaded surface is on a proximal portion of the guide sleeve and the one or more protruding tabs engaging the threads are on a distal portion of the grasping handle.

9. The safety-catch mechanism of claim 8 , wherein the threaded surface is on an outer surface of the guide sleeve, and the one or more protruding tabs engaging the threads are on an inner surface of the grasping handle.

10. The safety-catch mechanism of claim 1 , wherein the grasping handle is formed from at least two pieces.

11. The safety-catch mechanism of claim 10 , wherein the at least two pieces comprise a collar and a thumb ring.

12. The safety-catch mechanism of claim 11 , wherein the at least two pieces are attached using an attachment mechanism selected from the group consisting of an adhesive, a snap-fit, a weld, and an ultrasonic weld.

13. The safety-catch mechanism of claim 10 , wherein one of the at least two pieces includes a rib and another of the at least two pieces includes a notch, both sized such that the rib fits within the notch.

14. The safety-catch mechanism of claim 10 , wherein one of the at least two pieces includes a rib and another of the at least two pieces includes a recess, both sized such that the rib fits within the recess.

15. The safety-catch mechanism of claim 1 , wherein the threshold amount of mechanical force is about 1.5 inch-pounds.

16. The safety-catch mechanism of claim 1 , wherein the at least one safety-catch structure between threads of the threaded surface is configured as a narrowed section of threads.

17. The safety-catch mechanism of claim 1 , wherein the grasping handle is engaged movably over the guide sleeve.

18. The safety-catch mechanism of claim 1 , wherein the one or more protruding tabs are configured as circumferential threads that engage the threaded surface.

19. A safety-catch mechanism for a fiducial-deployment system, comprising:
an elongate first handle member having a central longitudinal axis and attached to a guide sleeve;
a stylet attached to a grasping handle and extending through at least a portion of the guide sleeve and the first handle member, along or generally aligned with the central longitudinal axis,
wherein the grasping handle is movably engaged to the guide sleeve,
wherein grasping handle and guide sleeve each have a portion of a safety-catch mechanism that engages another portion of the safety catch mechanism, and
wherein the safety-catch mechanism includes at least one safety-catch structure and at least one protruding tab constructed and dimensioned to traverse over and across the safety-catch structure when mechanical force exceeding a threshold moves at least one protruding tab past at least one safety-catch structure.

20. A stylet-advancement system, comprising:
an elongate first handle member having a handle lumen;
a guide sleeve proximal to the first handle member;
a grasping handle engaged movably to the guide sleeve;
a stylet connected to the grasping handle and extending through at least a portion of the guide sleeve and the first handle member,
at least one safety-catch means for preventing unintentional stylet advancement, wherein the safety-catch means includes at least one bump detent and at least one protruding tab constructed and dimensioned to traverse over and across the bump detent when mechanical force exceeding a threshold moves at least one protruding tab past at least one bump detent.

Assignees

• Cook Medical Technologies Llc

Inventors

• Lawrence Andrea C
• Widmyer Margaret R

Classifications

• A61B2090/3987

  Applicators for implanting markers · CPC title

• A61B2090/3912

  Body cavities · CPC title

• A61B2090/3966

  Radiopaque markers visible in an X-ray image · CPC title

• A61B90/39 Primary

  Markers, e.g. radio-opaque or breast lesions markers · CPC title

• A61B17/3468

  for implanting or removing devices, e.g. prostheses, implants, seeds, wires (devices for implanting seeds A61M37/0069) · CPC title