Automatic retractable safety penetrating instrument

• US 5,423,760 A
• Filed: 06/15/1994
• Issued: 06/13/1995
• Est. Priority Date: 12/06/1991
• Status: Expired due to Fees

• Current Assignee: Inbae Yoon
• Original Assignee: Inbae Yoon
• Inventors: Yoon, InBae
• Primary Examiner(s): Hirsch, Paul J.
• Application Number:
  US08/260,439
• Time in Patent Office: 363 Days
• Field of Search: 604/158, 604/165, 604/170, 604/274, 604/164
• US Class Current: 604/164.11
• CPC Class Codes: A61B 17/3415 for introducing tubes or catheters, e.g. gastrostomy tubes, drain catheters A61B17/3417 takes precedence; body piercing catheter guide needles A61M25/06
• 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 2017/3458 threaded
• 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
• CPC Class Codes: A61B 2090/0811 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

Abstract

A retractable safety penetrating instrument includes a cannula, a penetrating member disposed within the cannula and a hub mounting proximal ends of the penetrating member and the cannula. The penetrating member is movable to an operative state to penetrate tissue wherein a sharp tip of the penetrating member extends beyond a distal end of the cannula, and is arranged to be moved to a retracted position with the sharp tip of the penetrating member disposed within the cannula in a safe, protected position upon penetrating through the tissue. The penetrating member is selectively movable to various extended positions following retraction such that the sharp tip of the penetrating member can be positioned in an anatomical cavity to perform various medical procedures. The cannula can include various distensible, expandable or shape changing devices automatically positioned in response to retraction of the penetrating member to stabilize or hold the instrument within an anatomical cavity. A method of performing surgical procedures includes the steps of automatically retracting a sharp tip of the penetrating member within a cannula, moving the penetrating member distally to cause the sharp tip to protrude beyond a distal end of the cannula and performing a procedural step with the penetrating member.

Claims

1. A retractable safety penetrating instrument for penetration into an anatomical cavity comprising

a cannula having a distal end, a proximal end and a lumen extending between said cannula distal and proximal ends;

a hollow needle having a sharp distal end for penetrating tissue and being slidably disposed in said cannula;

means for automatically retracting said needle from an extended position wherein said sharp distal end protrudes beyond said cannula distal end to a retracted position wherein said sharp distal end is disposed within said cannula in response to penetration into the anatomical cavity with said needle; and

a safety probe slidably disposed in said needle, said safety probe being biased to extend beyond said cannula distal end with said needle in said retracted position.

2. An automatic retractable safety penetrating instrument as recited in claim 1 wherein said safety probe extends beyond said cannula a distance corresponding to a space to be formed with the safety probe in the anatomical cavity.

3. A retractable safety penetrating instrument for penetration into an anatomical cavity comprising

a cannula having a distal end, a proximal end and a lumen extending between said cannula distal and proximal ends;

a hollow needle having a sharp distal end for penetrating tissue and a proximal end, said needle being slidably disposed in said cannula;

a hub mounting said proximal end of said needle;

means for retracting said needle relative to said hub from an extended position wherein said sharp distal end protrudes beyond said cannula distal end to a retracted position wherein said sharp distal end is disposed within said cannula; and

a safety probe slidably disposed in said needle, said safety probe being biased to extend beyond said cannula distal end with said needle in said retracted position.