Fluid collection device with retractable needle
First Claim
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1. A needle-bearing medical device having a retractable needle with a sharpened tip for penetrating the skin of a patient for diagnostic or therapeutic purposes, the device comprising:
- a barrel;
a needle retainer positioned in the barrel and holding the needle axially to project forward from the barrel in an initial configuration;
an actuating member positioned in the barrel and operable by the user to effect automatic retraction of the needle into the barrel after use; and
fluid retention means associated with the needle for substantially preventing ejection of residual fluid from the needle during retraction of the needle.
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Abstract
A needle retraction mechanism for a needle bearing medical device is provided. The needle retainer selectively retains the needle in a projecting configuration in which the sharpened tip of the needle projects outwardly from the device. The needle retaining mechanism has an axial projection configured to provide at least one finger, and preferably a plurality of separable fingers that are joined together to form a bore.
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Citations
31 Claims
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1. A needle-bearing medical device having a retractable needle with a sharpened tip for penetrating the skin of a patient for diagnostic or therapeutic purposes, the device comprising:
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a barrel; a needle retainer positioned in the barrel and holding the needle axially to project forward from the barrel in an initial configuration; an actuating member positioned in the barrel and operable by the user to effect automatic retraction of the needle into the barrel after use; and fluid retention means associated with the needle for substantially preventing ejection of residual fluid from the needle during retraction of the needle. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A hand-held medical device, comprising a barrel;
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a needle projecting forward from the barrel and having a sharpened tip for penetrating the skin of a patient for transmitting fluid for diagnostic or therapeutic purposes; an automatic needle retraction mechanism positioned in the barrel and actuable by a user to effect retraction of the needle into the barrel after use; and fluid retention means associated with the needle for substantially preventing ejection of residual fluid from the needle during retraction of the needle. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A hand-held medical device, comprising:
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a barrel; a needle projecting forward from the barrel and having a sharpened tip for penetrating the skin of a patient; a spring connected with the needle and compressed within the barrel to exert a rearward bias upon the needle; a needle retainer for holding the needle in an initial projecting configuration from the barrel against the bias exerted by the spring; an actuating member positioned in the housing and operable by the user to release the needle retainer from holding the needle; and an actuator member configured to prevent operation of the actuating member, such that a compound operation of both the actuator member and the actuating members is required to effect retraction of the needle. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27)
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28. An automatic needle retraction mechanism for a needle-bearing medical device having a barrel, the retraction mechanism comprising:
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a spring connected to the needle and compressed within the barrel for exerting a bias upon the needle for withdrawing the needle into the barrel; a needle retainer positioned in the barrel and bonded to the needle for restraining the needle against the bias exerted by the spring; and an actuating member slidably positioned in the barrel and configured for disengaging the needle retainer from the needle upon advancement of the actuating member against the needle retainer. - View Dependent Claims (29, 30)
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31. In a medical device comprising a barrel and an actuating member slidably positioned in the barrel, a fluid seal comprising:
an integral head portion formed on the actuating member having an integral annular peripheral surface in contact with the interior of the barrel;
the barrel having a constricted portion formed therein and the actuating member being positioned in the barrel initially at a first position prior to use and slidable to a second position in the barrel to have the head located within the constricted portion of the barrel, whereby a fluid seal is provided during use.
Specification