Bone biopsy needle assembly
First Claim
Patent Images
1. A bone biopsy needle assembly, comprising:
- (a) an elongated tubular cannula having an axially extending lumen therethrough and having distal and proximal ends;
(b) a cannula handle having proximal and distal sides positioned on the proximal end of said cannula, a proximal portion of the proximal end of the cannula retained within the cannula handle, said proximal portion of the cannula being provided with longitudinal flute knurling around the external perimeter of said cannula for allowing the cannula to be securely held within the cannula handle by injection insert molding;
wherein(c) said cannula handle extends perpendicularly to the axis of said cannula; and
wherein(d) said cannula handle is comprised of two equal generally rectangular halves extending in diametrically opposed directions to each other from said cannula axis;
(e) each of said equal halves of said cannula handle having proximally extending shoulder projections substantially parallel to the axis with one of the said shoulder projections reaching closer to the cannula axis than the other said shoulder projection, with a distally extending slot formed between one of the shoulder projections and the cannula axis;
(f) an orifice in said cannula handle in flow communication with said cannula lumen, said orifice being coaxial with said cannula lumen;
(g) a stylet handle having distal and proximal sides removably positioned on the proximal end of said cannula handle, wherein(h) said stylet handle extends perpendicularly to the axis of said cannula and includes an elongated palm contacting surface on the proximal side thereof; and
wherein(i) said stylet handle is comprised of two equal generally rectangular halves extending in diametrically opposed directions to each other from said cannula axis along the same diameter and substantially to the same extent as said equal halves of said cannula handle;
(j) an elongated stylet extending from the distal side of said stylet handle and slidably received within said cannula lumen, said stylet being retained within said stylet handle by injection insert molding and terminating in an anchor bend at a distal terminus within said stylet handle, and said stylet having a sharpened distal tip which extends distally from the distal end of said cannula and said cannula having a sharpened beveled distal end edge;
(k) and wherein the distal side of each of said equal halves of said stylet handle further includes a recess means, each of said recess means being mated exclusively to one of said shoulder projections with a distally extending tang formed between one of the recesses and the stylet axis, said tang being matingly received by the slot on the cannula handle when the shoulder projections are mated with the recess means, thus allowing relative movement between the stylet and cannula handles only in the axial direction of said cannula and assuring bevel alignment between the sharpened beveled distal end edge of the cannula and the sharpened distal tip of the stylet;
(l) whereby when said shouldered projections on said cannula handle halves are received in the exclusively mated recesses of said stylet handle halves, force may be rotatingly applied around either axial direction of said elongated stylet positioned in said elongated cannula lumen without relative rotation between said elongated stylet and said elongated cannula.
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Abstract
A bone biopsy needle assembly is disclosed for withdrawing samples of bone, bone marrow and bone marrow cavity fluids as may be required in biopsy and transplant procedures. The assembly comprises a cannula having a sharpened distal end and a stylet, also having a sharpened distal end, coaxially received in the cannula lumen. The handles of the cannula and the stylet are provided with particular features for mating reception when assembled together to assure their secure alignment during the various operations required in use.
474 Citations
10 Claims
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1. A bone biopsy needle assembly, comprising:
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(a) an elongated tubular cannula having an axially extending lumen therethrough and having distal and proximal ends; (b) a cannula handle having proximal and distal sides positioned on the proximal end of said cannula, a proximal portion of the proximal end of the cannula retained within the cannula handle, said proximal portion of the cannula being provided with longitudinal flute knurling around the external perimeter of said cannula for allowing the cannula to be securely held within the cannula handle by injection insert molding;
wherein(c) said cannula handle extends perpendicularly to the axis of said cannula; and
wherein(d) said cannula handle is comprised of two equal generally rectangular halves extending in diametrically opposed directions to each other from said cannula axis; (e) each of said equal halves of said cannula handle having proximally extending shoulder projections substantially parallel to the axis with one of the said shoulder projections reaching closer to the cannula axis than the other said shoulder projection, with a distally extending slot formed between one of the shoulder projections and the cannula axis; (f) an orifice in said cannula handle in flow communication with said cannula lumen, said orifice being coaxial with said cannula lumen; (g) a stylet handle having distal and proximal sides removably positioned on the proximal end of said cannula handle, wherein (h) said stylet handle extends perpendicularly to the axis of said cannula and includes an elongated palm contacting surface on the proximal side thereof; and
wherein(i) said stylet handle is comprised of two equal generally rectangular halves extending in diametrically opposed directions to each other from said cannula axis along the same diameter and substantially to the same extent as said equal halves of said cannula handle; (j) an elongated stylet extending from the distal side of said stylet handle and slidably received within said cannula lumen, said stylet being retained within said stylet handle by injection insert molding and terminating in an anchor bend at a distal terminus within said stylet handle, and said stylet having a sharpened distal tip which extends distally from the distal end of said cannula and said cannula having a sharpened beveled distal end edge; (k) and wherein the distal side of each of said equal halves of said stylet handle further includes a recess means, each of said recess means being mated exclusively to one of said shoulder projections with a distally extending tang formed between one of the recesses and the stylet axis, said tang being matingly received by the slot on the cannula handle when the shoulder projections are mated with the recess means, thus allowing relative movement between the stylet and cannula handles only in the axial direction of said cannula and assuring bevel alignment between the sharpened beveled distal end edge of the cannula and the sharpened distal tip of the stylet; (l) whereby when said shouldered projections on said cannula handle halves are received in the exclusively mated recesses of said stylet handle halves, force may be rotatingly applied around either axial direction of said elongated stylet positioned in said elongated cannula lumen without relative rotation between said elongated stylet and said elongated cannula. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A bone biopsy needle assembly comprising:
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(a) an elongated tubular cannula having an axially extending lumen therethrough; (b) a cannula handle positioned on the proximal end of said cannula, the proximal portion of the cannula retained within the cannula handle being provided with longitudinal flute knurling around the external perimeter of the said cannula, allowing the cannula to be securely held within the cannula handle to be securely held within the cannula handle by injection molding;
wherein(c) said cannula handle extends perpendicularly to the axis of said cannula; and
wherein(d) said cannula handle is comprised of two equal rectangular halves extending in diametrically opposed directions to each other from said cannula axis; (e) an orifice in said cannula handle in flow communication with said cannula lumen, said orifice being coaxial with said cannula lumen; (f) a stylet handle removably positioned on the proximal end of said cannula handle;
wherein(g) said stylet handle extends perpendicularly to the axis of said cannula and includes an elongated palm contacting surface on the proximal side thereof; and
wherein(h) said stylet handle is comprised of two equal rectangular halves extending in diametrically opposed directions to each other from said cannula axis along the same diameter and substantially to the same extend as said equal halves of said cannula handle; (i) an elongated stylet extending from the distal side of said stylet handle and slidably received within said cannula lumen, said stylet being retained within said stylet handle by injection molding and terminating in an anchor bend at its distal terminus within said stylet handle, and said stylet having a sharpened distal tip which extends distally from the distal end of said cannula and said cannula having a sharpened beveled distal end edge; (j) wherein the distal side of each of said equal halves of said stylet handle further includes means for being mated exclusively to the proximal side of only one of said equal halves of said cannula handle, thus assuring bevel alignment between the sharpened beveled distal end edge of the cannula and the sharpened distal tip of the stylet; (k) a recess on the proximal side of said cannula handle which is coaxial with said orifice; (l) a syringe fitting in flow communication with said orifice molded into the cannula handle proximally extending from said cannula handle in said recess to an extent no more than the proximal extent of the cannula handle; (m) an externally ribbed neck nipple of the external perimeter of the cannula at the distal terminus of the cannula handle; and (n) a stop attachment comprised of an elongated tubular externally threaded extension and an internally threaded penetration stop guide received by said neck nipple, the distal terminus of the stop attachment being less than the distal terminus of the cannula;
wherein(o) the internal diameter of a major distal portion of the threaded extension is sized to the external diameter of the cannula and the internal diameter of a proximal terminus of the threaded extension is sized to fit with the neck nipple and is fixedly attached thereto; (p) the external threading of the threaded extension releasably engages the internal threading of the penetration stop guide, said penetration stop guide terminating distally in a penetration stop means to limit the depth of penetration of the bone biopsy needle; and (q) said penetration stop guide adapted to releasably receive a tubular shroud for protecting the bone marrow biopsy needle when not in use. - View Dependent Claims (9, 10)
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Specification