Patent ID: 7175643

Claim:
An automatic safe disposable blood sampling device, comprising: a case defining a shoot chamber, said shoot chamber being provided with a lancet-exiting hole at a front end thereof; a lancet disposed slidably in said shoot chamber and provided with a puncturing tip at a front portion thereof, said puncturing tip being pointed to said lancet-exiting hole in an alignment manner; a spring disposed at back of said lancet in a shooting direction of said lancet; and a locking and shooting structure provided on a side of said lancet and said case along a compression path of said spring, said locking and shooting structure comprising: an elastic arm button being an extended structure on a side of said case; a button engaging end of said elastic arm button facing a locking hole provided on a side wall of said case, the side wall having a bevel; an elastic arm being an extended structure on a side of said lancet corresponding to said side wall of said case; a free end of said elastic arm being engagable with said locking hole in a locking state, the free end employing the bevel; and a root portion of said elastic arm being provided with a notch or a shrink neck on which stress is easily concentratable, said notch or shrink neck forming a self-destructive breaking point of said elastic arm, such that the elastic arm is automatically self broken by contacting the bevel and boarding inwardly when said lancet changes from the locking state to a shooting state.