Protected needle assembly

Details Protected needle assembly Protected needle assembly

1993-08-18

1995-12-05

Rosenbaum, C. Fred

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

128763, A61M 532, A61B 500, B65D 8100

Patent

active

054724309

ABSTRACT:
The protected needle assembly employs a retractable sheath which can be moved from an extended protected position over a hollow needle to a retracted position exposing the hollow needle. A projection carried on the sheath is disposed in a guide slot having a circumferentially directed portion for receiving the projection. In addition, a spring or resilient sleeve is provided between the movable sheath and the housing to not only bias the sheath longitudinally of the hollow needle but also in a circumferential manner. In order to release the sheath, the needle assembly is brought into contact with a patient's skin or a septum and twisted. Thereafter, an axial force on the needle assembly causes the sheath to be retracted while the hollow needle penetrates through the skin or septum. Other embodiments are provided wherein a blunt needle can be moved within a hollow needle from an extended position protecting the hollow needle and a retracted position permitting exposure of the hollow needle.

REFERENCES:
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patent: 3354881 (1967-11-01), Bloch
patent: 4775369 (1988-10-01), Schwartz
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patent: 5106379 (1992-04-01), Leap
patent: 5209739 (1993-05-01), Talalay
patent: 5242401 (1993-09-01), Colsky
patent: 5292314 (1994-03-01), D'Alessio et al.

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