Combined syringe and needle shield

• US 5,160,326 A
• Filed: 06/19/1991
• Issued: 11/03/1992
• Est. Priority Date: 06/28/1988
• Status: Expired due to Fees

• Current Assignee: Sherwood Services AG
• Original Assignee: Sherwood Medical Company (Medtronic Plc)
• Inventors: Ranford, Alan B., Talonn, Daniel A.
• Primary Examiner(s): NOT, DEFINED
• Assistant Examiner(s): Polutta, Mark O.
• Application Number:
  US07/717,592
• Time in Patent Office: 503 Days
• Field of Search: 609/194-198, 609/192, 609/263, 609/110, 128/919, 128/763, 128/770
• US Class Current: 604/198
• CPC Class Codes: A61M 2005/3104 Caps for syringes without needle
• CPC Class Codes: A61M 5/3202 Devices for protection of the needle before use, e.g. caps A61M5/50 takes precedence; for infusion spikes A61M5/1626; protectors for sharps A61B50/3001
• CPC Class Codes: A61M 5/3271 with guiding tracks for controlled sliding of needle protective sleeve from needle exposing to needle covering position
• CPC Class Codes: A61M 5/3272 having projections following labyrinth paths
• CPC Class Codes: Y10S 128/919 Syringe, means to protect user

Abstract

A safety device including a protective needle shield which is movable between a retracted position wherein a needle is exposed and an extended position wherein the needle is protected. The needle shield including an inwardly directed and longitudinally oriented key member thereon and an elongate barrel member includes a collar member operatively associated therewith such that the key member is movably received in a keyway on the collar member as the needle shield is moved between the retracted and extended positions. The collar member also includes a locking slot thereon to receive a portion of the key member as the needle shield is rotated about the barrel member in the extended position of the needle shield.

Claims

1. A needle shielding device for use with a barrel, wherein a needle may be attached to the distal end of the barrel, the improvement comprising:

shield retaining means mounted on said barrel in use and including at least one locking slot and a keyway on an outer surface thereon and said keyway being longitudinally oriented therealong and includes distal and proximal ends thereon, and

an elongated needle shield having an inner surface and being movable over said barrel and retaining means between a retracted position in which the needle is exposed and an extended position in which the needle is exposed and an extended position in which said shield covers said needle, said shield including at least one elongated key extending inwardly on its interior surface, said key adapted to slide through said keyway between said retracted and extended positions and wherein said key is an elongate and longitudinally oriented member extending inwardly from said inner surface of said shield and includes distal and proximal ends thereon.

2. The needle shielding device according to claim 1, wherein said locking slot comprises a pair of opposing walls at least one of which includes a ramp surface over which said key can ride when said shield is rotated about said barrel, and a protrusion proximally of said locking slot for preventing said shield from being retracted after said key has been rotated into said locking slot.

3. The needle shielding device according to claim 2, wherein each of said opposing walls includes a ramp surface so that said key can be rotated in either direction into said locking slot when said shield is in said extended position.

4. The needle shielding device according to claim 1, wherein said shield includes a detent on said interior surface and said shield retaining means includes a surface adapted to abut against said detent to releasably retain said shield in said retracted position.

5. The needle shielding device according to claim 1, wherein said shield retaining means includes at least one detent on said outer surface adapted to abut against said proximal end of said key when said shield is in said extended position.

6. The needle shielding device according to claim 1, wherein said needle incudes a hub at a proximal end thereof and a protective needle sheath having a proximal end thereon and wherein said shield includes an end wall at the distal end thereof, said end wall including an aperture large enough to permit said hub of said needle to pass therethrough for mounting and removing said needle on said barrel but not large enough to permit said proximal end of said sheath to pass therethrough.

7. The needle shielding device according to claim 1, wherein said shield includes an inwardly extending rim adapted to abut against the proximal end of said shield retaining means to limit the forward movement of the shield beyond said extended position.

11. The needle shielding device according to claim 1, wherein said shield retaining means is a collar member separate from said barrel and wherein there is provided interlocking means on said collar member and said barrel for preventing rotation of said collar member about said barrel.

8. A needle shielding device for use with a barrel, wherein a needle may be attached to the distal end of the barrel, the improvement comprising:

shield retaining means operatively mounted on said barrel and including at least one locking slot and a keyway on an outer surface thereon and said keyway being longitudinally oriented therealong and includes distal and proximal ends thereon, and

an elongated needle shield having an inner surface and being movable over said barrel and retaining means between a retracted position in which the needle is exposed and an extended position in which the needle is exposed and an extended position in which said shield covers said needle, said shield including at least one elongated key extending inwardly on its interior surface, said key adapted to slide through said keyway between said retracted and extended positions and wherein said key is an elongate and longitudinally oriented member extending inwardly from said inner surface of said shield and includes distal and proximal ends thereon; and

wherein the distance between said distal and proximal ends of said key on said shield is greater than the distance between said distal and proximal ends of said keyway on said shield retaining means.

9. The needle shielding device according to claim 8, wherein said keyway is formed by projections extending radially outwardly from the exterior surface of said shield retaining means.

10. The needle shielding device according to claim 8, wherein said key and said keyway also prevent rotation of said shield about said barrel when said shield is in any position other than said extended position.

12. A needle shielding device comprising:

a barrel having a distal end and a needle operatively associated with said distal end of said barrel,

collar means mounted on said barrel in use, said collar means including at least one longitudinally oriented keyway having distal and proximal ends thereon,

an elongated needle shield having an inner surface and distal and proximal ends thereon and being movable over said barrel and collar means between a retracted position wherein said needle is exposed and an extended position wherein said needle is protected, and

at least one elongated key member oriented longitudinally along and inwardly from said inner surface of said shield and said key member including distal and proximal ends and wherein said key is slidably received through said keyway as said shield is moved between said retracted and extended positions.

14. The needle shielding device of claim 12 wherein said collar means includes a locking slot spaced apart from said keyway and said proximal end of said key is rotatable into said locking slot when said shield is in said extended position.

15. The needle shielding device of claim 12 wherein said shield includes a reduced diameter distal end thereon and said needle includes a proximal end thereon and a protective needle sheath removably received thereover, said distal end of said shield including an aperture therein to allow said needle to pass therethrough while preventing the passage of said needle sheath therethrough.

16. The needle shielding device of claim 12 wherein said key member slides in said keyway between said retracted and extended positions and said projections on said collar means prevent the rotation of said shield about said barrel as said shield is moved to said extended position.

17. The needle shield device of claim 12 wherein said collar means includes a locking slot spaced from said keyway on said collar means and a rotation preventing means is positioned between said keyway and said locking slot to prevent said shield from being rotated from said locking slot after said key is received in said locking slot.

18. The needle shielding device of claim 12 wherein said distal end of said shield includes a detent on said inner surface and said collar means includes a cooperating means thereon to contact said detent and releasably retain said shield in said retracted position.

19. The needle shielding device of claim 12 wherein said collar means is a cylindrical member fixedly positioned about a portion of said barrel.

13. A needle shielding device comprising:

a barrel having a distal end and a needle operatively associated with said distal end of said barrel,

collar means operatively mounted on said barrel, said collar means including at least one longitudinally oriented keyway having distal and proximal ends thereon,

an elongate needle shield having an inner surface and distal and proximal ends thereon and being movable over said barrel and collar means between a retracted position wherein said needle is exposed and an extended position wherein said needle is protected,

at least one elongated key member oriented longitudinally along and inwardly from said inner surface of said shield and said key member including distal and proximal ends and wherein said key is slidably received through said keyway as said shield is moved between said retracted and extended positions, and

wherein the distance between said distal and proximal ends of said key is greater than the distance between said distal and proximal ends of said keyway.

20. A needle shielding device comprising:

a barrel having a distal end and a shield attached to said distal end,

collar means operatively mounted on said barrel and including at least one longitudinally oriented keyway formed by a plurality of radially outwardly extending projections thereon, said keyway including distal and proximal ends thereon,

an elongate needle shield having an inner surface and distal and proximal ends and being movable over said barrel and said collar means between a retracted position wherein said needle is exposed and an extended position wherein said needle is protected,

at least one elongated key member oriented longitudinally along and extending from said inner surface of said shield between said distal and proximal ends of said shield, said key member having distal and proximal ends thereon and adapted to be movably received in said keyway as said shield is moved between said retracted position and said extended position, and

wherein the distance between said proximal and distal ends of said collar means is less than the distance between said distal and proximal ends of said key.

21. The needle shielding device of claim 20 wherein a locking slot is radially spaced apart from said keyway and said key member is rotatable into said locking slot when said shield is in said extended position.

22. The needle shielding device of claim 21 wherein a ramp member is positioned between said keyway and said locking slot to retain said proximal end of said key member in said locking slot when said shield is rotated about said barrel.

23. The needle shielding device of claim 20 wherein said projections on said collar means prevents the rotation of said shield about said barrel until said shield reaches said extended position whereupon said proximal end of said key member is rotatable from said keyway into said locking slot.

24. The needle shielding device of claim 20 wherein said collar means is a cylindrical member fixedly attached to said distal end of said barrel and includes a locking slot formed by a plurality of ramp-shaped members is located on said collar means in a location radially spaced apart from said keyway to receive said proximal end of said key therein upon rotation of said shield in said extended position about said barrel.