Importance

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Abstract

A suction-type blood sampler has a housing (1), a lancet unit (2) having a rod (4) extending backward from the lancet unit, and a plunger (3) connected to the rod in the housing and having a seal (7) attached to a forward end of the plunger. The seal is in sliding airtight contact with an inner periphery of the housing. The lancet unit consists of a lancet body (11) having a forwardly extending needle (12) and held by a lancet retainer (18) which is in sliding contact with the inner periphery. The blood sampler further has first, second and third springs (8, 9, 10) placed between the lancet unit and the plunger. The second spring urges the lancet unit to project the needle forwards, and the third spring tends to retract it. The first spring acts to reduce air pressure in the housing when the plunger is released. The blood sampler also has an air sealing means (32) disposed in the plunger so as to exhaust air and inhibit ambient air from entering the housing, so that the skin is pierced sharply and quickly, and by introducing ambient air into the evacuated housing, just a required amount of blood can be taken accurately and without any fear that the blood will scatter when the open end of the housing is removed from the skin.

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First Claim