Surgery – Instruments – Cutting – puncturing or piercing
Patent
1988-10-03
1990-06-05
Thaler, Michael H.
Surgery
Instruments
Cutting, puncturing or piercing
A61B 1734
Patent
active
049310593
ABSTRACT:
A needle/stylet combination for use as a marking needle or retraction needle comprising a hollow needle including a barb slot formed in the distal portion thereof having a distal end configured to penetrate tissue, a stylet including a single resilient barb formed on the distal end thereof slidably disposed within the hollow needle, and a stylet retraction limiting structure formed on the stylet in space relationship relative to the distal end of the single resilient barb, the axial length of the spaced relationship thereof being greater than the axial length of the barb slot such that when the single resilient barb is positioned distally relative to the barb slot the hollow needle houses the single resilient barb and when the stylet member is retracted in a distal to proximal direction the proximal portion of the single resilient barb extends outwardly through the barb slot whereby the stylet retraction limiting structure engages the proximal end of the barb slot to retain the distal end of the single resilient barb within the hollow needle and as the stylet is advanced axially in the proximal to distal direction the single resilient barb re-enters the hollow needle.
REFERENCES:
patent: 2541246 (1951-02-01), Held
patent: 4592356 (1986-06-01), Gutierrez
Fisher III A. W.
Thaler Michael H.
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