Surgery – Instruments – Cutting – puncturing or piercing
Reexamination Certificate
2000-01-10
2001-06-19
Truong, Kevin (Department: 3731)
Surgery
Instruments
Cutting, puncturing or piercing
Reexamination Certificate
active
06248120
ABSTRACT:
The subject of the present invention is a puncturing device in particular for puncturing skin of a patient in order to take a blood sample for diagnostic purposes.
U.S. Pat. No. 4,139,011 discloses a device for puncturing skin of a patient comprising a housing in the form of a sleeve closed at one end and which, at the other end, narrows and has a small opening. Inside the housing there is a slidably mounted rod, which at one end terminates in a slider positioned inside the housing. At the other end there is a rod comprising an elastic arm terminating in a holding tooth, which rests on the edge of the opening in the housing. Between the rod and the bottom of the sleeve a spring is positioned and, at the other end of the slider, a puncturing insert is provided.
A device for puncturing comprising a sleeve and a push element for actuating the device positioned at one end of the sleeve is known from the U.S. Pat. No. 5,356,420. The opposite end of the sleeve is open. Inside the sleeve there is slidably displacement piston, which at the end closer to the push element terminates in a head member, and which at the end closer to the open end of the sleeve terminates in a puncturing tip. Inside the sleeve, between the end face of the push element and the piston a driving spring is located, and between the piston and the open end of the sleeve there is a return spring positioned. The piston has, at the outer circumference thereof, wings which rest on an internal projection of the sleeve.
The puncturing device according to the invention comprises a sleeve, a push element positioned at one end of the sleeve, a piston and a puncturing tip slidably mounted in the sleeve, a drive spring positioned between the face end of the push element and the piston and a return spring positioned inside the sleeve between its bottom with an opening for the puncturing tip and the piston, and characterises in that a piston comprises a flange located at its outer rim resting against the top section of the sleeve and detaching from the piston when pressure is applied to the push element.
Preferably the flange comprises a ring and fasteners which bond the ring with the piston.
The advantage of the device according to the invention is that it provides a way of a fast and substantially painless piercing of skin, especially a skin on finger, ear or heel of a patient in order to take a blood sample for diagnostic purposes. The device, due to its structure, is expandable, because after the wings are broken off, it cannot be re-used.
REFERENCES:
patent: 4139011 (1979-02-01), Benoit et al.
patent: 4203446 (1980-05-01), Hofert et al.
patent: 4527561 (1985-07-01), Burns
patent: 5356420 (1994-10-01), Czernecki et al.
Bednarek Michael D.
P. Z. “HTL” Spolka Akcyjna
Pittman Shaw
Truong Kevin
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