Bone marrow biopsy needle and method for using the same
First Claim
1. A biopsy needle assembly comprising, in combination:
- a cannula defining an inner biopsy tissue sample and receiving bore of substantially constant internal diameterspiral ribs running uniformly along an interior surface of said bore; and
an elongated stylet having rounded side edges removably received within the inner biopsy tissue sample receiving and retaining bore of the cannula.
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Accused Products
Abstract
A biopsy needle assembly that is an improvement over the Jamshidi biopsy needle assembly is provided. The improved biopsy needle assembly includes a cannula with a uniform diameter internal surface defining an inner biopsy tissue sample receiving and retaining bore having projections thereon, and a stylet having rounded edges with at least one V-shaped groove at a distal cutting tip removably received within the bore of the cannula. The projections may be barbs, annular or spiral ribs that line the inner biopsy tissue sample receiving and retaining bore. The stylet may include a quick release knob for engaging with an improved coupling at the proximal end of the cannula. The improved coupling is substantially cylindrical with a cross handle substantially in the middle thereof. The coupling may also include internal threads engaging a syringe. The improved biopsy needle assembly permits more consistent acquisition of an adequate tissue sample for biopsy and is less painful to the patient.
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Citations
17 Claims
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1. A biopsy needle assembly comprising, in combination:
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a cannula defining an inner biopsy tissue sample and receiving bore of substantially constant internal diameter spiral ribs running uniformly along an interior surface of said bore; and an elongated stylet having rounded side edges removably received within the inner biopsy tissue sample receiving and retaining bore of the cannula. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A biopsy needle assembly comprising in combination:
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a hollow elongated cannula with a substantially uniform external configuration and having an internal surface with spiral ribs running uniformly thereon and defining an inner biopsy tissue sample receiving and retaining axial bore of substantially constant internal diameter; and a coupling of the proximal end of the cannula for engaging with one of a stylet or a syringe, the coupling being substantially cylindrical with a cross handle substantially in the middle thereof and including at a proximal end thereof a pair outwardly-extending spaced apart opposed dowels on an external surface for engaging the stylet and internal threads on an internal surface for engaging the syringe. - View Dependent Claims (16)
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17. A method of obtaining a tissue sample from the body of a patient, comprising the steps of:
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providing a biopsy needle assembly including a hollow cannula having an internal surface with spiral ribs running uniformly thereon and defining an inner tissue sample and retaining bore of substantially constant internal diameter and an elongated stylet having rounded side edges and received within the bore of the cannula in a fully inserted position; inserting the biopsy needle assembly into the patient using a cutting distal end of the stylet to penetrate the skin of the patient; removing the stylet from within the inner tissue sample receiving and retaining bore of the cannula; drawing the tissue sample into the inner tissue sample receiving and retaining bore; and extracting the tissue sample from the inner tissue sample receiving and retaining bore.
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Specification