Biopsy needles
First Claim
1. A biopsy needle for collecting a tissue specimen, the needle including an inner tube with a snarecoil operatively connected at a distal end thereof, an outer cannula, a stylet and a handle assembly that includes a biasing mechanism that permits a user to selectively actuate the biopsy needle so that the outer cannula and the inner tube are rapidly advanced over the stylet and beyond a distal end thereof to provide a shearing action of the tissue specimen.
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Accused Products
Abstract
In one embodiment, a biopsy needle that is particularly suited for shearing and collecting soft tissue specimens is provided and is formed of an inner tube with a snare at a distal end thereof, an outer cannula, a stylet and a handle assembly. In one aspect of the present invention, the handle assembly includes a spring loaded mechanism described in greater detail below that permits the user to selectively actuate the biopsy needle so that the outer cannula and the inner tube are rapidly advanced beyond the stylet to provide a shearing action of the soft tissue specimen. In one exemplary embodiment, the rapid advancement of the needle to achieve appropriate shear/cutting forces and to facilitate specimen transit into the needle is accomplished by the spring loaded mechanism in which there is coordination between the rapid advancement of the needle over the shaft and activation of the winding down of the snarecoil.
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Citations
39 Claims
- 1. A biopsy needle for collecting a tissue specimen, the needle including an inner tube with a snarecoil operatively connected at a distal end thereof, an outer cannula, a stylet and a handle assembly that includes a biasing mechanism that permits a user to selectively actuate the biopsy needle so that the outer cannula and the inner tube are rapidly advanced over the stylet and beyond a distal end thereof to provide a shearing action of the tissue specimen.
- 17. A biopsy needle for collecting a tissue specimen, the needle including an inner tube with a snarecoil operatively connected at a distal end thereof, an outer cannula, a stylet and a handle assembly that includes an actuatable axial drive mechanism for rapidly driving the inner tube and the outer cannula, in a longitudinal axial direction, over the stylet to a position where the inner tube and the outer cannula are advanced beyond a distal end of the stylet to provide a shearing action of the tissue specimen, and a torque generating mechanism associated at least in part with the inner tube that is actuatable to translate a torque to the inner tube relative to the outer cannula resulting in activation of a winding down of the snarecoil, the actuation of drive mechanism and the torque generating mechanism being coordinated with one another.
- 21. A biopsy needle for collecting a tissue specimen, the needle including an inner tube with a snarecoil operatively connected at a distal end thereof, an outer cannula and a handle assembly that includes a torque generating mechanism associated at least in part with the inner tube that is actuatable to translate a torque to the inner tube relative to the outer cannula resulting in activation of a winding down of the snarecoil and capture of the specimen.
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34. A needle for collecting a specimen comprising:
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a stylet;
an inner tube that slidably receives the stylet through a bore formed therethrough;
an outer cannula disposed about the inner tube, wherein during activation of the needle, the inner tube and the outer cannula travel axially over and beyond a distal end of the stylet; and
means for generating negative pressure within the needle for causing the specimen to more readily enter the needle, the means including a first seal and a second seal, the first seal being disposed between the stylet and the inner tube that generates a vacuum within a distal portion of the needle during axial travel of the inner tube and the outer cannula facilitating specimen transit into the needle, the second seal being disposed between the outer cannula and the inner tube. - View Dependent Claims (35)
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- 36. A biopsy needle for collecting a tissue specimen, the needle including an inner tube with a snarecoil operatively connected at a distal end thereof, an outer cannula and a handle assembly that includes a torque generating mechanism associated with the inner tube that is actuatable to translate a torque to the inner tube relative to the outer cannula resulting in activation of a winding down of the snarecoil, wherein the outer cannula has a first window formed therein and the inner tube has a second window which is selectively aligned with the first window when the inner tube is rotated within the outer cannula to a position where the windows at least partially overlap one another after the snarecoil is tightened to permit access to the specimen collected in the needle.
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38. A biopsy needle for collecting a tissue specimen comprising a boring tube and a biasing mechanism operatively connected to the boring tube, the biasing mechanism permitting a user to selectively actuate the needle to cause the boring tube to rapidly advance axially over a stylet and beyond a distal end thereof to provide a shearing action of the tissue specimen as a result of a distal end of the boring tube being driven into the tissue specimen, the needle further including means for generating negative pressure within the needle for causing the specimen to be drawn into the needle, the means including a first seal and a second seal, the first seal disposed between the stylet and the boring tube, the second seal being disposed between the boring tube and another element of the needle, the first and second seals generating a vacuum within the boring tube as the boring tube is axially advanced over the stylet.
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39. A biopsy needle for collecting a tissue specimen comprising an a stylet, an inner tube disposed about the stylet, an outer cannula disposed about the inner tube and a handle assembly, wherein the outer cannula has a first window formed therein and the inner tube has a second window which is selectively aligned with the first window when the inner tube is rotated within the outer cannula to a position where the windows at least partially overlap one another to permit retrieval and removal of the specimen collected in the inner tube.
Specification