Protective device for cannula used to draw blood
First Claim
1. A protective device for a cannula used to draw blood, the device comprising:
- an elongated sheath open at one end and including a longitudinal slot;
stop means at the other end of the sheath;
a piston disposed in the sheath to be longitudinally slidable between an extended position against the stop means and a retracted position away from the stop means, the piston having a bore extending through it in the direction in which the piston slides;
means for securing an elongated cannula in the piston bore so the cannula extends longitudinally through the bore with one end of the cannula in the sheath and the scarf end of the cannula extending outwardly away from the sheath when the piston is in the extended position; and
a slidable sleeve disposed around the sheath and connected to the piston through the slot so that as the sleeve slides relative to the sheath and away from the stop means, the piston is moved longitudinally within the sheath to the retracted position and thus moves the scarf end of the cannula to a safely enclosed position within the sheath.
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Accused Products
Abstract
A protective device for enclosing the scarf of a cannula used to draw blood includes an elongated sheath open at one end and having stop means at the other end. A piston is disposed in the sheath to be slidable between an extended position against the stop means and a retracted position away from the stop means. The piston has a bore extending through it in the direction in which the piston slides. Means are provided for securing an elongated, double-ended cannula in the piston bore so the cannula extends longitudinally through the bore with one end of the cannula in the sheath and the other end of the cannula extending outwardly away from the sheath when the piston is in the extended position. Means are provided for sliding the piston away from the stop means to the retracted position to retract the outwardly extending end of the cannula into the sheath.
107 Citations
14 Claims
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1. A protective device for a cannula used to draw blood, the device comprising:
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an elongated sheath open at one end and including a longitudinal slot; stop means at the other end of the sheath; a piston disposed in the sheath to be longitudinally slidable between an extended position against the stop means and a retracted position away from the stop means, the piston having a bore extending through it in the direction in which the piston slides; means for securing an elongated cannula in the piston bore so the cannula extends longitudinally through the bore with one end of the cannula in the sheath and the scarf end of the cannula extending outwardly away from the sheath when the piston is in the extended position; and a slidable sleeve disposed around the sheath and connected to the piston through the slot so that as the sleeve slides relative to the sheath and away from the stop means, the piston is moved longitudinally within the sheath to the retracted position and thus moves the scarf end of the cannula to a safely enclosed position within the sheath. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A protective device for a cannula used to draw blood, the device comprising:
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an elongated sheath open at one end and including a longitudinal slot; stop means at the other end of the sheath; a piston disposed in the sheath to be longitudinally slidable between an extended position against the stop means and a retracted position away from the stop means, the piston having a bore extending through it in the direction in which the piston slides; means for securing an elongated cannula in the piston bore so the cannula extends longitudinally through the bore with one end of the cannula in the sheath and the scarf end of the cannula extending outwardly away from the sheath when the piston is in the extended position; slidable means rigidly secured to the piston and extending away from the piston through the longitudinal slot in the sheath so the slidable means and the sheath may be manipulated with one hand to move the piston away from the stop means to the retracted position so the outwardly extending scarf end of the cannula moves to a safely enclosed position within the sheath; and longitudinally extending detent means adjacent the end of the slot near the end of the sheath with the stop means for releasably holding the piston in the extended position adjacent the stop means and so the piston can be moved with one hand from the extended to the retracted position without rotating the piston relative to the sheath.
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Specification