Blood sampling device
First Claim
1. A blood sampling device comprising a barrel containing a spring-loaded lancet releasable by a trigger from a primed rearward position, momentarily to project its tip from the forward end of the barrel, the lancet having a distortable or detachable appendage to engage the barrel and hold the lancet against a drive spring, wherein,the appendage extends rearwardly from the lancet and latches to a detent provided by the internal structure of the barrel, the release of the lancet is by the trigger integral with the barrel being pressed in transversely to the barrel to unlatch the appendage, and the barrel is an integral molding with two halves hinged together to encase the lancet and the spring.
1 Assignment
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Accused Products
Abstract
A blood sampling device has a lancet (2) captive within a housing (1), to be released from a rearward primed position by pressing a trigger (18) on the side of the housing. A spring (3) shoots the lancet (2) forwards, momentarily to project its tip. The lancet (2) is initially held by a hooked tongue (25, 28) that latches behind a transverse web (10, 11) within the housing, the trigger action dislodging that engagement. The tongue (25) either springs back after release and so will abut the trigger (18) or the front of the web (10) if pushed back in an attempt to re-latch, or it will stay permanently deformed and thus be unable to re-engage the web (10). Alternatively, the trigger (18) may slice off the hook (28), making re-use impossible.
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Citations
15 Claims
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1. A blood sampling device comprising a barrel containing a spring-loaded lancet releasable by a trigger from a primed rearward position, momentarily to project its tip from the forward end of the barrel, the lancet having a distortable or detachable appendage to engage the barrel and hold the lancet against a drive spring, wherein,
the appendage extends rearwardly from the lancet and latches to a detent provided by the internal structure of the barrel, the release of the lancet is by the trigger integral with the barrel being pressed in transversely to the barrel to unlatch the appendage, and the barrel is an integral molding with two halves hinged together to encase the lancet and the spring.
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11. A blood sampling device comprising a barrel containing a spring-loaded lancet releasable by a trigger from a primed rearward position, momentarily to project its tip from the forward end of the barrel, the lancet having a distortable or detachable appendage to engage the barrel and hold the lancet against a drive spring, wherein,
the appendage extends rearwardly from the lancet and latches to a detent provided by the internal structure of the barrel, the release of the lancet is by the trigger integral with the barrel being pressed in transversely to the barrel to unlatch the appendage, and the trigger, when actuated, has a snap engagement with the barrel to retain the trigger in its actuated position against subsequent reactivation.
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12. A blood sampling device comprising a barrel containing a spring-loaded lancet releasable by a trigger from a primed rearward position, momentarily to project its tip from the forward end of the barrel, the lancet having a distortable or detachable appendage to engage the barrel and hold the lancet against a drive spring, wherein,
the appendage extends rearwardly from the lancet and latches to a detent provided by the internal structure of the barrel, the release of the lancet is by the trigger integral with the barrel being pressed in transversely to the barrel to unlatch the appendage, and the appendage has resilient flexure so that, after clearing the detent and trigger, the appedage resumes its original position and will engage a portion of the trigger forward of the detent if the lancet is urged back towards its primed position.
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13. A blood sampling device comprising a barrel containing a spring-loaded lancet releasable by a trigger from a primed rearward position, momentarily to project its tip from the forward end of the barrel, the lancet having a distortable or detachable appendage to engage the barrel and hold the lancet against a drive spring, wherein,
the appendage extends rearwardly from the lancet and latches to a detent provided by the internal structure of the barrel, the release of the lancet is by the trigger integral with the barrel being pressed in transversely to the barrel to unlatch the appendage, and the appendage has resilient flexure so that, after clearing the detent, the appendages resumes its original position and, in the absence of any prior obstruction by the trigger, will engage the forward side of the detent if the lancet is urged back towards its primed position so that it cannot be reprimed.
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14. A blood sampling device comprising a barrel containing a spring-loaded lancet releasable by a trigger from a primed rearward position, momentarily to project its tip from the forward end of the barrel, the lancet having a distortable or detachable appendage to engage the barrel and hold the lancet against a drive spring, wherein,
the appendage extends rearwardly from the lancet and latches to a detent provided by the internal structure of the barrel, the release of the lancet is by the trigger integral with the barrel being pressed in transversely to the barrel to unlatch the appendage, and the appendage has a weakness at its root causing appendage to stay bent after clearing the detent, so that if the lancet is urged back to its primed position, the appendage will not re-latch to the detent.
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15. A blood sampling device comprising a barrel containing a spring-loaded lancet releasable by a trigger from a primed rearward position, momentarily to project its tip from the forward end of the barrel, the lancet having a distortable or detachable appendage to engage the barrel and hold the lancet against a drive spring, wherein,
the appendage extends rearwardly from the lancet and latches to a detent provided by the internal structure of the barrel, the release of the lancet is by the trigger integral with the barrel being pressed in transversely to the barrel to unlatch the appendage, the appendage has a narrow neck and a head which engages behind the detent over which the neck lies, and the trigger has a portion formed as a blade which initially registers with the neck and, when the trigger is pressed in, severs the neck to cause the head to fall free and the lancet to be sprung forwards.
Specification