Bone marrow biopsy needle
AssigneeMedsol Corp.
InventorsAlec Goldenberg, Melvin R. Hoagland, III
Life of this patent
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Abstract
An improved biopsy needle having an outer cannula, an inner tube, and a stylet. The distal end of the inner tube is provided with a snare in the form of a coil extending from the inner tube. The free end of the coil is adhered to the inner surface of the outer cannula. Upon rotation of the inner tube with respect to the outer cannula, the coil will decrease in diameter to either sever or hold the biopsy piece within the outer needle. After removal of the needle from the patient, rotating the inner tube in the opposite direction will cause the coil to expand to its original diameter and allow the biopsy piece to be removed from the needle.
Claims26
A biopsy needle for removal of tissue from a patient, comprising:
- an outer tube having a proximal and a distal end;
- an inner tube within said outer tube,
- said inner tube having a proximal and a distal end;
- a snare having two ends, one of said ends connected to said inner tube and the other of said ends comprising a cylindrical member and being coupled to said outer tube, said snare having a first and a second position, wherein in said first position, said snare has a first diameter and wherein in said second position, said snare has a second diameter smaller than said first diameter, said snare being moved from said first position to said second position by rotation of said inner tube with respect to said outer tube in one direction and being moved from said second position to said first position by rotation in an opposite direction.
A reusable biopsy needle, comprising:
- an outer tube having a distal end;
- an inner tube extending within said outer tube, said inner tube having at one end a portion which increases and decreases in diameter substantially free of plastic deformation with movement of said inner tube relative to said outer tube, said potion of said inner tube being coupled to said distal end of said outer tube.
A biopsy needle, comprising:
- an outer tube having a distal end;
- an inner tube extending within said outer tube, said inner tube having at one end a portion which increases and decreases in diameter substantially free of plastic deformation with movement of said inner tube relative to said outer tube;
- a cylindrical member connected to said portion of said inner tube;
- said cylindrical member being coupled to said distal end of said outer tube.
Dependencies are inferred from the claim text.