Retractable safety penetrating instrument for portal sleeve introduction

• US 5,569,293 A
• Filed: 05/10/1995
• Issued: 10/29/1996
• Est. Priority Date: 11/27/1991
• Status: Expired due to Fees

• Current Assignee: Inbae Yoon
• Original Assignee: Inbae Yoon
• Inventors: Yoon, InBae
• Primary Examiner(s): Tucker, Guy V.
• Application Number:
  US08/438,601
• Time in Patent Office: 538 Days
• Field of Search: 128/751, 128/752, 128/753, 128/754, 604/95, 604/158, 604/162, 604/163, 604/164, 604/165, 604/170, 604/272, 604/274, 604/280, 604/169, 606/167, 606/171, 606/185
• US Class Current: 606/185
• CPC Class Codes: A61B 17/3417 Details of tips or shafts, e.g. grooves, expandable, bendable; Multiple coaxial sliding cannulas, e.g. for dilating syringe needles A61M5/32; dilators A61M29/00
• CPC Class Codes: A61B 17/3474 Insufflating needles, e.g. Veress needles
• CPC Class Codes: A61B 17/3496 Protecting sleeves or inner probes; Retractable tips for protecting body piercing guide needles A61M25/0612
• CPC Class Codes: A61B 2017/00477 Coupling A61B2017/0046 takes precedence
• CPC Class Codes: A61B 2017/3484 Anchoring means, e.g. spreading-out umbrella-like structure
• CPC Class Codes: A61B 2090/08021 of the patient or his organs

Abstract

A retractable safety penetrating instrument for introducing a portal sleeve into a cavity in the body includes a portal sleeve and a penetrating member disposed within the portal sleeve and supported in a manner to automatically move proximally from an extended position wherein a sharp distal end of the penetrating member protrudes from the portal sleeve to a retracted position wherein the sharp distal end of the penetrating member is protected in response to distal movement of the retractable safety penetrating instrument upon penetration into a cavity in the body. A retracting mechanism moves the penetrating member proximally and is normally locked in a position preventing proximal movement of the penetrating member and is released by distal movement of an operating member to trigger retraction of the penetrating member.

Claims

1. A retractable safety penetrating instrument for forming a portal communicating with a cavity in the body to allow passage of instruments for performing least invasive medical procedures comprising

a hollow portal sleeve for providing a passage through a cavity wall and having a distal end for positioning in the body cavity, a proximal end for positioning externally of the body cavity and a lumen extending between said distal and proximal ends;

a housing mounting said proximal end of said sleeve;

a penetrating member disposed in said lumen of said sleeve and having a distal end for penetrating the cavity wall a proximal end and a longitudinal axis;

a hub mounting said proximal end of said penetrating member and having a distal wall for engaging said housing;

a rail mounted externally on said proximal end of said penetrating member, said rail including a hollow cylindrical member laterally offset from and parallel with said longitudinal axis and having an abutment wall;

a retracting mechanism for moving said penetrating member proximally relative to said sleeve from an extended position where said distal end of said penetrating member protrudes beyond said distal end of said sleeve to a retracted position to prevent contact of said distal end of said penetrating member with tissue, said retracting mechanism including means for biasing said penetrating member in a proximal direction, said biasing means including a spring disposed within said cylindrical member and mounted in compression between said distal wall of said hub and said abutment wall; and

trigger means for automatically actuating said retracting mechanism to move said penetrating member to said retracted position in response to movement of said retractable safety penetrating instrument distally upon said distal end of said sleeve entering the body cavity whereby said distal end of said penetrating member is protected from inadvertent contact with tissue in the body cavity.

2. A retractable safety penetrating instrument for forming a portal communicating with a cavity in the body to allow passage of instruments for performing least invasive medical procedures comprising

a hollow portal sleeve for providing a passage through a cavity wall and having a distal end for positioning in the body cavity, a proximal end for positioning externally of the body cavity and a lumen extending between said distal and proximal ends;

a housing mounting said proximal end of said sleeve;

a penetrating member disposed in said lumen of said sleeve and having a distal end for penetrating the cavity wall and proximal end;

a hub mounting said proximal end of said penetrating member and having a distal wall for engaging said housing;

a rail mounted externally on said proximal end of said penetrating member and having an abutment wall;

a plate extending from said rail and having an aperture therein receiving said proximal end of said penetrating member;

retracting means for moving said penetrating member proximally relative to said sleeve from an extended position where said distal end of said penetrating member protrudes beyond said distal end of said sleeve to a retracted position to prevent contact of said distal end of said penetrating member with tissue, said retracting means including means for biasing said penetrating member in a proximal direction, said biasing means including a spring mounted in compression between said distal wall of said hub and said abutment wall; and

trigger means for automatically actuating said retracting means to move said penetrating member to said retracted position in response to movement of said retractable safety penetrating instrument distally upon said distal end of said sleeve entering the body cavity whereby said distal end of said penetrating member is protected from inadvertent contact with tissue in the body cavity.

3. A retractable safety penetrating instrument as recited in claim 2 further including means for permitting said penetrating member to move proximally from said extended position during penetration of the cavity wall and to move distally thereafter, a longitudinal slot in said proximal end of said penetrating member and a pin on said rail received within said slot for providing a positive stop limiting proximal movement of said penetrating member during penetration of the cavity wall.

4. A retractable safety penetrating instrument as recited in claim 3 wherein said rail includes a hollow cylinder having an end closed by said abutment wall and said spring is disposed concentrically within said cylinder.

5. A retractable safety penetrating instrument as recited in claim 3 wherein said rail includes opposing parallel sides extending perpendicularly from said abutment wall and said spring is disposed between said opposing sides.