Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1996-04-04
1998-09-01
Yasko, John D.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604177, 604263, A61M 532
Patent
active
058004009
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention pertains to winged needles for the administration of fluids to and the withdrawal of blood samples from patients.
BACKGROUND OF THE INVENTION
Winged needles (also known as butterfly needles) have long been a popular and simple means of gaining intravascular access for administering fluids and medicines to patients. Winged needles are also used for drawing blood samples or performing hemodialysis. The winged finger grips employed in their design offers maximum sensitivity which is important for successful venipuncture. In the relaxed (wings down) position, the wings also provide means for fixing the needle securely, close to the skin puncture site where it cannot be readily jarred.
Known safety shields (see U.S. Pat. Nos. 4,676,783 (Jagger), 4,781,692 (Jagger), 4,935,011 (Hogan), 4,943,283 (Hogan) and 5,137,515 (Hogan) and the Saf-T E-Z set available from Becton Dickinson Co., add considerable bulk to the basic butterfly needle design. For example Hogan patents 4,935,011 and 4,943,283 describe shields which are slidable along a length of tubing and sized to receive a needle and associated gripping means. The bulk added by such shields significantly interferes with the best features of the butterfly needle. It impedes the delicate needle tip control required while starting the needle into a vein. It also extends behind the puncture site, thus increasing the risk of needle dislodgement even by a slight bump.
The use of winged needles is still significant (albeit declining, due to the availability of thin walled catheters) especially for intravascular procedures which do not require long dwell times. Winged needles are often preferred, for example, for giving single bolus injections of medicines and diagnostic agents.
In many countries, price precludes use of intravascular catheters. Butterfly needles cost only $0.25 to $0.50, whereas intravascular catheters may cost $1.75 to $3.00. This price differential gains universal particular importance in this era of cost controls.
The present invention preserves the central features of butterfly needles while also providing a simple and effective safety needle shield slidable along a length of tubing to prevent accidental needle stick injuries.
SUMMARY OF THE INVENTION
This invention provides a safety shield slidable along a length of tubing which is initially in a retracted position away from the needle and associated winged needle gripping means where it does not interfere with the delicate control of the needle tip during venipuncture. In one embodiment of the invention the shield may be used to detach the gripping means from the needle as the needle is withdrawn into the shield.
During venipuncture the wings of the device of this invention are folded upward to pinch and compress the needle so that it is held securely while pushed through the skin and vessel wall. The wings are then allowed to return to a relaxed, flat position. It is a feature of this invention that, in the relaxed position, there is still sufficient friction provided by the wings to prevent passive motion of the needle or of the coupling of the needle to the tubing within the winged gripping means.
A winged needle gripping means is found in the Becton Dickinson Angioset, Intima, and Saf-T Intima catheters as well as the Menlo Care Landmark catheter. However, in these devices the gripping means is not in direct contact with the needle. Instead, the needle is within a catheter which in turn is in contact with the gripping means such that the needle elements cannot be withdrawn from the gripping means by pulling on the connection tubing. The device of this invention permits the needle to be passed back through the winged gripping means by pulling on the connection tubing.
In Jagger, patent 4,676,783, the needle is retracted into a shield by pulling on a special section of tubing. However, the forward end of the shield is prevented from moving backward beyond the base of the needle. The shield adds bulk to the needle end and cannot be retracted along the connecti
REFERENCES:
patent: 4676783 (1987-06-01), Jagger et al.
patent: 4702260 (1987-10-01), Wang
patent: 4781692 (1988-11-01), Jagger et al.
patent: 4927415 (1990-05-01), Brodsky
patent: 4935011 (1990-06-01), Hogan
patent: 4943283 (1990-07-01), Hogan
patent: 5067945 (1991-11-01), Ryan et al.
patent: 5085639 (1992-02-01), Ryan
patent: 5088982 (1992-02-01), Ryan
patent: 5108376 (1992-04-01), Bonaldo
patent: 5112311 (1992-05-01), Utterberg et al.
patent: 5112312 (1992-05-01), Luther
patent: 5137515 (1992-08-01), Hogan
patent: 5154699 (1992-10-01), Ryan
patent: 5169391 (1992-12-01), Vogel
patent: 5219339 (1993-06-01), Saito
patent: 5350368 (1994-09-01), Shields
patent: 5382240 (1995-01-01), Lam
patent: 5401250 (1995-03-01), Shields
City of Hope
Yasko John D.
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