Plunger-driven collet handle and system for fiducial deployment

Patent metadata

Field	Value
Publication number	US-10363407-B2
Application number	US-201514712559-A
Country	US
Kind code	B2
Filing date	May 14, 2015
Priority date	Jun 16, 2014
Publication date	Jul 30, 2019
Grant date	Jul 30, 2019

Abstract

Embodiments include a fiducial deployment system with a handle configured for actuation of the same, the handle including a collet mechanism actuatable for controlled, one-at-a-time deployment of fiducials. A fiducial may include one or more protuberances configured to engage one or more slots in a needle of the system. The needle may be configured to deliver a plurality of fiducials to a target location in serial fashion, one at a time. In certain embodiments, echogenic placement of fiducials may present certain advantages. The handle includes an actuation mechanism with a collet and plunger actuation member configured for incrementally or otherwise controlledly deploy one or more fiducials at a time by advancing a sty let through and/or retracting the body of a slotted needle in which fiducials are disposed with a fiducial protrusion extending into the needle slot, which also includes retaining structures that do not impede the needle lumen.

First claim

We claim:

1. A fiducial deployment system, said system comprising:
a fiducial deployment needle retaining for distal deployment, in a controlled serial manner, a plurality of fiducials;
a plunger driven collet handle configured for said fiducial needle deployment, the plunger driven collet handle comprising:
an elongate handle member of the plunger driven collet handle, said elongate handle member defining a central longitudinal axis and an inner handle wall;
a central collet member longitudinally movable in the elongate handle member, the collet member comprising:
a distal end including collet jaws that surround and define a collet lumen, and
a proximal end;
a stylet disposed longitudinally through the deployment needle, extending proximally into the elongate handle member and through the collet lumen of the collet member;
a collar member slidably engaged around the distal end of the collet member so that,
in a first state, the stylet is releasably gripped by the collet jaws as the collet jaws are more constrainedly engaged by the collar member and that,
in a second state wherein the collet jaws are less constrainedly engaged by the collar member, the collet is configured to slide proximally along the stylet; and
a plunger actuation member extending distally into the elongate handle member and affixed to the proximal end of the central collet member, said plunger actuation member longitudinally movable within at least a portion of the elongate handle member in a manner configured to advance the collet member distally and to provide reciprocal proximal movement of the collet member with the plunger actuation member.

2. The system of claim 1 , wherein the plunger actuation member is spring-urged proximally.

3. The system of claim 1 , further comprising a stopper housing defining a housing lumen.

4. The system of claim 3 , wherein the stopper housing further defines a lower stopping lip that effectively stops proximal movement of the collar member along the central longitudinal axis of the elongate handle member.

5. The system of claim 4 , wherein in the first state the collar member constrains the collet member so as to exert a clamping force on the stylet when the plunger actuation member is at rest and the collet is engaged around the collar member.

6. The system of claim 3 , further comprising a buffer plate disposed on the inner handle wall of the elongate handle member and defining at least one buffer stopping lip.

7. The system of claim 6 , wherein the at least one buffer stopping lip is configured to effectively stop distal movement of the collar member along the central longitudinal axis of the elongate handle member while permitting continued distal movement of the collet member.

8. The system of claim 7 , wherein—in the second state—the collar member is stopped by the at least one buffer stopping lip and is configured to circumferentially release the collet member, and thereby to diminish and/or remove clamping force of the collet member on the stylet when the collet member is advanced distally past the at least one buffer stopping lip.

9. The system of claim 1 , further comprising an indicator dial disposed in the elongate handle member.

10. The system of claim 9 , wherein the indicator dial includes indicia, viewable through a window in the elongate handle member, of the number of fiducials deployed by distalward movement of the collet member.

11. The system of claim 9 , wherein the indicator dial is configured to be rotationally driven by distalward movement of the plunger actuation member.

12. The system of claim 11 , wherein the plunger actuation member further defines one or more vertically protruding actuating members.

13. The system of claim 12 wherein the indicator dial further defines one or more vertically protruding biased teeth that engage the one or more vertically protruding actuating members of the plunger actuation member to rotationally drive the indicator dial.

14. A medical device handle configured for controlled incremental lengthwise stylet distal advancement through a cannula by repeated actuation, the handle comprising:
an elongate outer handle body defining a longitudinal handle lumen;
an elongate cannula attached directly or indirectly to a distal end of the handle body, the cannula defining a longitudinal cannula lumen in mechanical communication with the handle lumen;
a collet disposed in the longitudinal handle lumen and longitudinally movable in the longitudinal handle lumen, wherein the collet is proximally spring-biased by a compression spring into a collar that circumferentially encompasses jaws of the collet and is configured to compress the jaws of the collet to releasably grip a stylet;
the stylet extending distally through a longitudinal collet lumen of the collet into the longitudinal cannula lumen; and
a plunger member disposed on the proximal end of the elongate outer handle body within the longitudinal handle lumen having a portion of the plunger member mechanically engaging the collet, configured such that a first actuation of the plunger member by moving it longitudinally relative to the longitudinal handle lumen is effective to move the collet and the stylet distally by a first predetermined increment and configured such that proximal, spring-biased reciprocation of the plunger and the collet provides for a second actuation of the plunger member by moving it longitudinally relative to the longitudinal handle lumen, wherein said second actuation of the plunger member is effective to move the collet and the stylet distally by a second predetermined increment.

15. The medical device handle of claim 14 , wherein actuating of the plunger member by moving it transversely against, and/or longitudinally relative to the longitudinal handle lumen is effective to deploy one or more fiducials from a distal end of the elongate cannula.

16. The medical device handle of claim 14 , configured such that repeated distalward actuation of the plunger and corresponding repeated movement of the collet distally, combined with proximal reciprocation of the collet in a state not grasping the stylet and not moving the stylet proximally, is effective to advance an incremental distal movement of the stylet longitudinally relative to the longitudinal handle lumen.

17. The medical device handle of claim 16 , further comprising a stopper housing formed on an inner wall of the longitudinal handle lumen and configured effectively to prevent distal movement of the collar longitudinally relative to the longitudinal handle lumen.

18. The medical device handle of claim 17 , wherein the stopper housing is configured effectively to disengage the collar from a distal end of the stylet and to allow distal movement of the collet relative to the stylet.

Assignees

• Cook Medical Technologies Llc

Inventors

• Clancy Michael
• Mcgrath Darach
• Campbell Triona
• Mulcahy Patrick
• Keady Fionan
• Toomey Ciaran

Classifications

• A61B2090/034

  abutting on parts of the device itself · CPC title

• A61B2090/3987

  Applicators for implanting markers · CPC title

• A61B2090/0811

  for the position of a particular part of an instrument with respect to the rest of the instrument, e.g. position of the anvil of a stapling instrument · CPC title

• A61B2090/3925

  ultrasonic · CPC title

• A61B2090/0804

  Counting number of instruments used; Instrument detectors · CPC title