Trocar device with detachable handle and associated methods

Patent metadata

Field	Value
Publication number	US-9615838-B2
Application number	US-201615004299-A
Country	US
Kind code	B2
Filing date	Jan 22, 2016
Priority date	Jan 13, 2015
Publication date	Apr 11, 2017
Grant date	Apr 11, 2017

Abstract

The present disclosure provides methods for forming or enlarging holes in bone tissue and methods for fixing medical plates to bodies. The present disclosure also provides for products produced by the methods of the present disclosure and for apparatuses used to perform the methods of the present disclosure.

First claim

What is claimed:

1. A trocar insertion system comprising:
a driver handle ( 202 ) with a driving shaft ( 206 ) affixed thereto;
a first mating feature on a proximal end ( 220 ) of the driving shaft ( 206 ) opposite the driver handle ( 202 );
an elongated blade fixture ( 112 ) having proximal and distal ends with a second mating feature on the distal end;
a spring retention feature ( 119 ) located on the elongated blade fixture ( 112 ) between the proximal and distal ends,
a collar feature ( 116 ) located on the elongated blade fixture ( 112 ) between the spring retention feature ( 119 ) and the distal end;
a spring housing cap ( 110 ) slidably fitted around the elongated blade fixture ( 112 ) between the spring retention feature ( 119 ) and the collar feature ( 116 );
a trocar compression spring ( 108 ) slidably fitted around the elongated blade fixture ( 112 ) between proximal end and the spring retention feature ( 119 );
a spring housing ( 106 ) comprising a hollow body with proximal and distal ends, wherein
the distal end is fixedly attached to the spring housing cap ( 110 ),
the trocar compression spring ( 108 ) and spring retention feature ( 119 ) are enclosed within an interior volume of the spring housing ( 106 ),
the trocar compression spring ( 108 ) is configured to be compressed between the spring retention feature ( 119 ) and a spring catching feature ( 107 ) located at the proximal end of the spring housing ( 106 ), and,
at least a portion of the elongated blade fixture ( 112 ) is slidably disposed within the spring housing ( 106 ) with central longitudinal axes of the elongated blade fixture ( 112 ) and the spring housing ( 106 ) being coaxially aligned;

wherein the first mating feature and second mating feature are detachably engaged such that the driving shaft ( 206 ) and the elongated blade fixture ( 112 ) are detachably connected in coaxial alignment;

wherein:
the driving shaft ( 206 ) comprises a hollow tube;
the driving shaft ( 206 ) further comprises:
a first aperture and a second aperture through walls of the hollow tube on opposite sides of a central longitudinal axis of the hollow tube,
a third aperture through the wall of the hollow tube in a position between a location of the first and second apertures and a proximal end of the hollow tube, and,
a groove ( 222 ) through the wall of the hollow tube at the proximal end;

the trocar insertion system further comprises:
a spring stop pin fixed within the first and second apertures and passing through the central longitudinal axis of the hollow tube;
a control pin fixed within the third aperture and partially extending into an interior volume of the hollow tube;
a spring pressure pin ( 226 ) comprising a cylinder configured to slide within the interior volume of the hollow tube, positioned within the interior volume of the hollow tube with a longitudinal axis of the cylinder aligned with the hollow tube longitudinal axis,
wherein the spring pressure pin ( 226 ) has a reduced diameter in a portion of the middle of side walls,
wherein the reduction in diameter is at least as large as a portion of the control pin that partially extends into the interior volume of the hollow tube,
and wherein the spring pressure pin ( 226 ) is positioned such that the portion of the control pin that partially extends into the interior volume of the hollow tube is slidably contained within the volume of the reduced diameter portion of the spring pressure pin ( 226 ) between two non-reduced-diameter end regions of the spring pressure pin ( 226 ), and,

a handle compression spring ( 224 ) positioned within an interior volume of the hollow tube between the spring stop pin and the spring pressure pin ( 226 );
a fourth aperture located on the elongated blade fixture ( 112 ) between the collar feature ( 116 ) and the distal end, and the distal end of the elongated blade fixture ( 112 ) is configured to slidably fit within the interior of the proximal end of the hollow tube;
a trocar locator pin fixed within the fourth aperture and partially extending outward from a surface of the elongated blade fixture ( 112 );

the driving shaft ( 206 ) and elongated blade fixture ( 112 ) are detachably connected by a detachable engagement of the trocar locator pin within the groove ( 222 ) of the driving shaft ( 206 ); and,
the handle compression spring ( 224 ) is at least partially compressed by the spring pressure pin ( 226 ), which is slidably contained between the distal end of the elongated blade fixture ( 112 ) and the handle compression spring ( 224 ).

2. The trocar insertion system according to claim 1 , wherein the first mating feature and second mating feature comprise a pair of helical threads that can detachably engage together.

3. The trocar insertion system according to claim 1 , wherein the first and second mating features comprise a ball detent mechanism arrangement wherein one of the driving shaft ( 206 ) and elongated blade fixture ( 112 ) can be received within the other such that a spring-loaded ball falls partially into an aperture in order to detachably connect the driving shaft ( 206 ) and elongated blade fixture ( 112 ).

4. The trocar insertion system according to claim 1 , wherein the second mating feature comprises a protruding part and the first mating feature comprises a depression adapted to receive the protruding part in a snap joint configuration.

5. The trocar insertion system according to claim 1 , wherein an exterior of the spring housing ( 106 ) is configured to engage with an aperture ( 302 ) of a medical plate ( 300 ) such that the spring housing ( 106 ) is retained within the aperture ( 302 ) and the proximal end of the elongated blade fixture ( 112 ) passes through the aperture ( 302 ) when a force is applied to the distal end of the elongated blade fixture ( 112 ) relative to the medical plate ( 300 ).

6. The trocar insertion system according to claim 1 , wherein an exterior of the spring housing ( 106 ) comprises a cylinder with a tapered diameter at the proximal end of the elongated blade fixture ( 112 ).

7. The trocar insertion system according to claim 1 , wherein the proximal end of the elongated blade fixture ( 112 ) comprises a shape suitable for anchoring into body tissue.

8. The trocar insertion system according to claim 1 , wherein the proximal end of the elongated blade fixture ( 112 ) comprises a bone awl.

9. The trocar insertion system according to claim 1 , wherein the proximal end of the elongated blade fixture ( 112 ) comprises a shape suitable for forming pilot holes in bone.

10. A device comprising:
an elongated blade fixture ( 112 ) having proximal and distal ends with a mating feature on the distal end;
a spring retention feature ( 119 ) located on the elongated blade fixture ( 112 ) between the proximal and distal ends;
a collar feature ( 116 ) located on the elongated blade fixture ( 112 ) between the spring retention feature ( 119 ) and the distal end;
a spring housing cap ( 110 ) slidably fitted around the elongated blade fixture ( 112 ) between the spring retention feature ( 119 ) and the collar feature ( 116 );
a trocar compression spring ( 108 ) slidably fitted around the elongated blade fixture ( 112 ) between proximal end and the spring retention feature ( 119 );
a spring housing ( 106 ) comprising a hollow body configured to slidably fit around the elongated blade fixture ( 112 ) and attach to the spring housing cap ( 110 ); and,
wherein the elongated blade fixture further comprises a lumen.

11. The device of claim 10 , wherein:
the spring housing ( 106 ) further comprises proximal and distal ends, wherein:
the distal end is attached to the spring

Assignees

• Eca Medical Instr

Inventors

• Nino John
• Ivinson David

Classifications

• A61B17/1728 Primary

  for holes for bone plates or plate screws · CPC title

• A61B17/1604

  Chisels; Rongeurs; Punches; Stamps · CPC title

• A61B17/34

  Trocars; Puncturing needles · CPC title

• A61B17/3494

  with safety means for protection against accidental cutting or pricking, e.g. limiting insertion depth, pressure sensors (for the peridural space A61B17/3401) · CPC title

• A61B2017/0046

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