A - Human Necessities – 61 – M
Patent
A - Human Necessities
61
M
A61M 5/32 (2006.01) A61M 25/00 (2006.01) A61M 25/06 (2006.01)
Patent
CA 2135706
Leakage of blood from the insertion set, during and after safety-needle retraction, is suppressed by components that receive and retain flash blood for viewing -- notwithstanding forces developed within the device in retraction. One preferred such system includes a flash chamber that moves with the retracting needle, within a hollow handle, carrying a relatively high flow-impedance element which allows air exhaust from the chamber into the handle to admit flash blood -- but isolates blood in the chamber from retraction-generated increase in air pressure in the handle. Energy-absorbing components control or compensate for retraction speed, to provide quiet smooth retraction -- while yet enabling use of ample retraction force to make retraction reliable. Among several energy absorbing systems disclosed is a preferred one that includes a viscous material introduced within the hollow handle to damp the retracting motion; and an injection port to facilitate introduction of the viscous material. Needle reuse, and concomitant risk of spreading disease, are avoided through components that deter needle redeployment -- by deterring access to or forward motion of the needle, or trigger reengagement.
Cover Walter E.
Davidner Alan A.
Gowling Lafleur Henderson Llp
Phase Medical Inc.
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