Surgery – Diagnostic testing – Liquid collection
Reexamination Certificate
1999-08-11
2001-01-09
Hindenburg, Max (Department: 3736)
Surgery
Diagnostic testing
Liquid collection
Reexamination Certificate
active
06171262
ABSTRACT:
CROSS REFERENCE TO RELATED APPLICATIONS, IF ANY
None
BACKGROUND OF THE INVENTION AND PRIOR ART
The present invention relates to a medical apparatus for safely drawing blood or other fluid from a patient wherein the apparatus includes a cannula housing into which the cannula can be withdrawn and contained after use for safe disposal.
OBJECTS OF THE INVENTION
It is the primary object of the invention to provide a blood collection device in which the cannula may be automatically retracted into a housing by a spring after use merely by turning easily manipulatable rotatable parts of the housing to permit a non-circular portion of the cannula support to pass through a non-circular opening in an end of the housing to withdraw the cannula into the housing.
It is a further object of the invention to provide a reliable blood collection device comprised of a small number of parts, each of which are easily formed in mass production.
SUMMARY OF THE INVENTION
The present invention accordingly provides a retractable blood collection device comprising:
a) an elongated tubular housing having an end wall partially closing a first end of said housing;
b) a cannula support hub slidably supported in said housing for longitudinal movement therein;
c) a cannula affixed to and supported by said hub, said cannula having a first end extending from a first side of said hub exteriorly of said housing through said housing end wall, said cannula having a second end extending from a second side of said hub in said housing, said housing having a greater length than said cannula;
d) a cannula retainer ring rotatably affixed to said first end of said housing, said retainer ring having a centrally located aperture through which a portion of said hub and cannula protrude; and
e) a compression spring in said housing seated between said hub and said first end of said housing biasing said hub for retracting said first end of said cannula into said housing to position said cannula completely in said housing.
REFERENCES:
patent: 5069225 (1991-12-01), Okamura
patent: 5423758 (1995-06-01), Shaw
Creative Plastic Technology, LLC
Hindenburg Max
Roth & Goldman
Szmal Brian
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