Patent ID: 7798977
Filing Date: 2010-09-21
Classification: A61B,A61M

Abstract:
1. A disposable blood sampling device, comprising: a plunger having a first end and a second end opposite to the first end; a rubber stopper coupled to the second end of the plunger; a barrel having an axially extended tube body with a first end and a second end opposite to the first end, wherein a chamber is defined in the tube body from the first end to the second end and has a width closely fitted for the rubber stopper, and the second end has a needle connector communicated to the chamber, and a ring-shaped flange formed around the needle connector and having an inner spiral protrusion formed on an inner surface thereof; a sealing member, which is made of resilient material, having a first end and a second end opposite to the first end, wherein an outer spiral groove is formed on an outer circumferential surface of the sealing member for engaging with the inner spiral protrusion of the barrel, a blind hole is formed from the first end to the second end for receiving the needle connector, a conical hole is formed on the second end, and a sealing hole is provided to connect the blind hole and conical hole and is sealed when there is no external force applied thereto; a needle holder having a first end and a second end opposite to the first end, wherein a chamber is formed in the needle holder from the first end to the second end, the second end has a needle-holding hole communicated to the chamber, an outer circumferential surface of the needle holder has a plurality of guide notches, first longitudinal guide grooves connected to the guide notches, transversal guide grooves connected to the first longitudinal guide grooves, second longitudinal guide grooves connected to the transversal guide grooves, and an outer protrusion; a needle inserted into the needle-holding hole of the needle holder and the sealing hole of the sealing member; a protection sleeve having an axially extended tube body with a first end and a second end opposite to the first end, wherein a passage is confined by an inner wall of the tube body and is formed from the first end to the second end, the inner wall has a guide slot formed from the first end toward the second end, a longitudinal slot communicated to the guide slot for guiding the outer protrusion of needle holder and a step defined between the longitudinal slot and guide slot, an end of the longitudinal slot close to the first end of the protection sleeve has a through hole with an elastic member protruded to a center of the through hole, an inner circumferential surface of the protection sleeve close to the second end has an inner protrusion with an inner diameter smaller than an outer diameter of the outer protrusion of the needle holder; a needle sheath having an axially extended tube body with a first end and a second end opposite to the first end, wherein a chamber is formed in the needle sheath from the first end to the second end, and the first end has a lock slot fitted with an outer diameter of the needle holder; and an anticoagulant storing tube disposed in the chamber of the needle sheath and close to the second end of the needle sheath.