Skin pricker blood sampling device
First Claim
1. A skin pricker comprising an elongate housing having an interior and forward and rearward ends, a lancet within the housing, spring urged towards the forward end thereof, means for releasing the lancet along a firing path from a cocked rearward position to cause momentary projection of its needle tip through an aperture at said forward end, and means for preventing re-exposure of the tip after such momentary projection, characterised in that the preventing means includes a projection on the interior of the housing or on the lancet which initially co-operates with a longitudinal channel in the lancet or on the housing having a non-return rear end for escape of the projection from the channel as the lancet tip approaches exposure, subsequent co-operation of the projection with the lancet if re-cocking is attempted causing the lancet to be misaligned from the firing path.
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Accused Products
Abstract
A skin pricker has a housing (1) for a lancet (5) which, when released from a rearward cocked position, is propelled forwards by a spring momentarily to project its tip (3). During the forward motion a peg (12) within the housing (1) passes along a slot (10) in the lancet and, just before the tip (3) projects, snaps through a neck (11) at the rear end of the slot. If the lancet (5) is then pushed back, the peg (12) cannot re-enter the slot (10): instead it wedges the lancet sideways and, before it can be re-cocked, traps the lancet behind an abutment (13) ensuring that the tip (3) cannot be re-exposed.
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Citations
11 Claims
- 1. A skin pricker comprising an elongate housing having an interior and forward and rearward ends, a lancet within the housing, spring urged towards the forward end thereof, means for releasing the lancet along a firing path from a cocked rearward position to cause momentary projection of its needle tip through an aperture at said forward end, and means for preventing re-exposure of the tip after such momentary projection, characterised in that the preventing means includes a projection on the interior of the housing or on the lancet which initially co-operates with a longitudinal channel in the lancet or on the housing having a non-return rear end for escape of the projection from the channel as the lancet tip approaches exposure, subsequent co-operation of the projection with the lancet if re-cocking is attempted causing the lancet to be misaligned from the firing path.
Specification