Safety needle instrument with movable cannula and needle

• US 5,665,072 A
• Filed: 01/11/1995
• Issued: 09/09/1997
• 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): Manahan, Todd E.
• Application Number:
  US08/371,558
• Time in Patent Office: 972 Days
• Field of Search: 604/164, 604/165
• US Class Current: 604/164.12
• 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 17/3496 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
• 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 safety needle instrument for establishing a portal in the wall of an anatomical cavity includes a housing, an elongate cannula movable relative to the housing between an extended rest position and a retracted position and having a proximal end mounted by the housing and a distal end for introduction in the anatomical cavity, a cannula bias member for biasing the cannula distally toward the cannula extended position, a needle disposed within the cannula and movable relative thereto between an extended position and a retracted position where the needle distal end is proximally spaced from the cannula distal end, a retracting mechanism for moving the needle from the needle extended position to the needle retracted position, a handle for manually moving the needle from the needle retracted position to the needle extended position, a locking mechanism for locking the needle in the needle extended position while permitting a predetermined amount of proximal movement of the needle during penetration of the anatomical cavity wall, a needle bias member for biasing the needle distally in the needle extended position while permitting the needle to move proximally during penetration of the anatomical cavity wall, and a releasing mechanism responsive to penetration of the safety needle instrument into the anatomical cavity for triggering release of the locking means to permit the retracting means to move the needle proximally to the needle retracted position.

Claims

1. A safety needle instrument for establishing a portal in the wall of an anatomical cavity comprising

a housing;

an elongate cannula having a proximal end mounted by said housing and a distal end for introduction in the anatomical cavity, said cannula being movable relative to said housing during penetration between an extended rest position and a retracted position;

cannula bias means for biasing said cannula distally relative to said housing toward said rest position;

a needle disposed within said cannula and having a distal end for penetrating the anatomical cavity wall, said needle being movable relative to said housing between an extended position and a retracted position where said needle distal end is proximally spaced from said cannula distal end;

retracting means for moving said needle from said needle extended position to said needle retracted position;

means for manually moving said needle from said needle retracted position to said needle extended position;

locking means for locking said needle in said needle extended position while permitting a predetermined amount of proximal movement of said needle relative to said housing during penetration of the anatomical cavity wall;

needle bias means for biasing said needle distally relative to said housing in said needle extended position while permitting proximal movement of said needle during penetration of the anatomical cavity wall; and

releasing means responsive to penetration of said safety needle instrument into the anatomical cavity for triggering release of said locking means to permit said retracting means to move said needle proximally to said needle retracted position.

2. A safety needle instrument as recited in claim 1 wherein said releasing means is responsive to distally-biased movement of said cannula upon penetrating into the anatomical cavity.

3. A safety needle instrument as recited in claim 2 and further comprising a rail member mounting a proximal end of said needle, wherein said proximal end of said needle includes a flange movable within said rail member, said proximal end of said cannula carries an operating member, said locking means includes a latch spring engaging said rail member to lock said needle in said extended position and said releasing means includes a trigger responsive to distally-biased movement of said operating member for releasing said latch spring.

4. A safety needle instrument as recited in claim 1 wherein said releasing means is responsive to distally-biased movement of said needle upon penetrating into the anatomical cavity.

5. A safety needle instrument as recited in claim 1 wherein said releasing means is responsive to distally-biased movement of said cannula and said needle upon penetrating into the anatomical cavity.

6. A safety needle instrument as recited in claim 5 and further comprising a hub and a rail member movably disposed within said hub for mounting a proximal end of said needle, wherein said proximal end of said needle includes a flange movable within said rail member, said proximal end of said cannula carries an operating member, said locking means includes a latch spring disposed within said hub for engaging said rail member to lock said needle in said extended position and said releasing means includes a trigger responsive to distally-biased movement of said needle flange and said operating member for releasing said latch spring.

7. A safety needle instrument as recited in claim 1 wherein said needle distal end extends distally from a junction where a transverse dimension of said needle changes and wherein said cannula distal end is aligned with said junction when said needle and said cannula are in said respective extended positions.

8. A safety needle instrument as recited in claim 1 wherein said needle distal end extends distally from a junction where a transverse dimension of said needle changes and wherein said cannula distal end is located proximally of said junction when said needle and said cannula are in said respective extended positions.

9. A safety needle instrument as recited in claim 1 wherein said needle distal end extends distally from a junction where a transverse dimension of said needle changes and wherein said cannula distal end is located distally of said junction when said needle and said cannula are in said respective extended positions.

10. A safety needle instrument as recited in claim 1 and further comprising a hub mounting a proximal end of said needle, said hub being configured to detachably mate with said housing.

11. A safety needle instrument as recited in claim 10 and further comprising a protective sheath fixed to said hub and disposed between said cannula and said needle when said hub is mated with said housing, said protective sheath having a distal end proximally spaced from said needle distal end when said needle is extended and distally spaced from said needle distal end when said needle is retracted.

12. A safety needle instrument for establishing a portal in the wall of an anatomical cavity comprising

a housing;

an elongate cannula having a proximal end mounted by said housing and a distal end for introduction in the anatomical cavity, said cannula being movable relative to said housing between an extended rest position and a retracted position;

cannula bias means for biasing said cannula distally toward said rest position;

a needle disposed within said cannula and having a distal end for penetrating the anatomical cavity wall, said needle being movable relative to said cannula between an extended position and a retracted position where said needle distal end is proximally spaced from said cannula distal end;

retracting means for moving said needle from said needle extended position to said needle retracted position;

means for manually moving said needle from said needle retracted position to said needle extended position;

locking means for locking said needle in said needle extended position while permitting a predetermined amount of proximal movement of said needle during penetration of the anatomical cavity wall;

needle bias means for biasing said needle distally in said needle extended position while permitting proximal movement of said needle during penetration of the anatomical cavity wall;

releasing means responsive to penetration of said safety needle instrument into the anatomical cavity for triggering release of said locking means to permit said retracting means to move said needle proximally to said needle retracted position, wherein said releasing means is responsive to distally-biased movement of said needle upon penetrating into the anatomical cavity; and

a rail member mounting a proximal end of said needle, wherein said proximal end of said needle includes a flange movable within said rail member, said locking means includes a latch spring engaging said rail member to lock said needle in said extended position and said releasing means includes a trigger responsive to distally-biased movement of said needle flange for releasing said latch spring.