Active Stylet Safety Shield
First Claim
Patent Images
1. A biopsy needle assembly comprising:
- a cannula including a cannula handle and a cannula shaft extending outward from the handle, the cannula shaft having an axial passage extending through a proximal end of the shaft secured to the handle and a sharp distal tip of the shaft;
a stylet including a stylet handle and a stylet shaft extending outward from the stylet handle, the stylet shaft having a sharp distal tip and being adapted to be slidably received in the axial passage of the cannula shaft, the stylet handle being adapted to be releasably connected to the cannula handle when the stylet shaft is received in the cannula shaft to form a handle of the needle assembly;
a safety shield including a locking mechanism configurable between an unlocked configuration, in which the locking mechanism permits the shield to be moved axially along the stylet shaft when the shield is generally proximal of the tip of the stylet shaft, and a locked configuration, in which the locking mechanism substantially prevents axial movement of the shield when the shield is at a location covering the tip of the stylet shaft, the shield and the stylet being adapted for releasable interengagement when the stylet and cannula are connected to each other with a force greater than any force interengaging the shield and the cannula whereby the shield moves with the stylet after the stylet handle and the cannula handle are released from securement and as the stylet shaft is axially withdrawn from the cannula shaft; and
a shield release device mounted on the stylet and operable for pushing the safety shield in a direction out of the stylet handle.
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Accused Products
Abstract
A bone needle assembly has a cannula and a stylet including a shaft received in a cannula shaft. A stylet safety shield is carried by the stylet to cover a sharp tip of the stylet shaft when removed from the cannula shaft after the bone is penetrated. The stylet includes a shield release device that moves the shield somewhat out of a handle member of the stylet when the stylet is released from the cannula, so that the safety shield can be more easily grasped.
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Citations
16 Claims
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1. A biopsy needle assembly comprising:
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a cannula including a cannula handle and a cannula shaft extending outward from the handle, the cannula shaft having an axial passage extending through a proximal end of the shaft secured to the handle and a sharp distal tip of the shaft; a stylet including a stylet handle and a stylet shaft extending outward from the stylet handle, the stylet shaft having a sharp distal tip and being adapted to be slidably received in the axial passage of the cannula shaft, the stylet handle being adapted to be releasably connected to the cannula handle when the stylet shaft is received in the cannula shaft to form a handle of the needle assembly; a safety shield including a locking mechanism configurable between an unlocked configuration, in which the locking mechanism permits the shield to be moved axially along the stylet shaft when the shield is generally proximal of the tip of the stylet shaft, and a locked configuration, in which the locking mechanism substantially prevents axial movement of the shield when the shield is at a location covering the tip of the stylet shaft, the shield and the stylet being adapted for releasable interengagement when the stylet and cannula are connected to each other with a force greater than any force interengaging the shield and the cannula whereby the shield moves with the stylet after the stylet handle and the cannula handle are released from securement and as the stylet shaft is axially withdrawn from the cannula shaft; and a shield release device mounted on the stylet and operable for pushing the safety shield in a direction out of the stylet handle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of using a biopsy needle assembly comprising:
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penetrating the skin with a stylet needle and cannula needle of the biopsy needle assembly; disconnecting a stylet handle mounting the stylet needle from the cannula handle mounting the cannula needle; separating the stylet handle and needle from the cannula handle and needle so that a stylet needle safety shield at least partially disposed in the stylet handle moves with the stylet handle; urging the safety shield with a shield release device from a location interior of the stylet handle outward from the interior of the stylet handle. - View Dependent Claims (12, 13, 16)
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- 14. A method as set forth in 13 further comprising grasping the safety shield in the second position and sliding the safety shield to a location covering a sharp tip of the stylet.
Specification