Exchangeable core biopsy needle
The present disclosure provides biopsy needles configured to maximize tissue sampling yield and further ensure collection of a cohesive unit of sampled tissue. The biopsy needles of the present disclosure provide a distinct tissue collection distal end configured to collect a full core of tissue sample and keep the full core intact. The distal end may include a distinct helical slot extending from an open distal end or a distinct cutting tip forming a coring feature.
1. A biopsy needle comprising:
an elongate tubular body having a longitudinal axis and comprising an open proximal end, an open distal end, an outer surface, and an inner surf ace defining a lumen extending along the longitudinal axis between the proximal and distal ends; and
a cutting tip defined on the distal end of the body, the cutting tip comprising first and second portions formed on opposing sides of the needle body and converging at a pointed end of the cutting tip:
the first portion comprising a coring element formed from a first set of bevel grinds, wherein the first set of bevel grinds comprises a first bevel grind oblique to the longitudinal axis and extending from a proximal surface of the cutting tip and terminating at the pointed end of the cutting tip, wherein the coring element defines a cutting edge configured to excise sample material upon rotational movement of the needle body about the longitudinal axis so as to capture and draw a core of sample material within the lumen of the body; and
the second portion comprising a side slot formed from a second set of bevel grinds, wherein the second set of bevel grinds opposite the first set of bevel grinds comprises a second bevel grind, a third bevel grind, and a fourth bevel grind, wherein the second bevel grind is orthogonal to the longitudinal axis and extends from the proximal surface of the cutting tip towards the third bevel grind, wherein the third bevel grind is parallel to the longitudinal axis and extends from the second bevel grind towards the pointed end of the cutting tip, and wherein the fourth bevel grind is oblique to the longitudinal axis and extends from the third bevel grind and terminates at the pointed end of the cutting tip.
2. The biopsy needle of claim 1 , wherein the first and fourth bevel grinds comprise identical angles.
3. The biopsy needle of claim 1 , wherein the cutting tip further comprises a back-cut bevel grind oblique to the outer surface of the body and proximate to the pointed end of the cutting tip for providing a smooth needle passage during needle insertion and withdrawal during a biopsy procedure.
4. The biopsy needle of claim 1 , wherein the cutting edge of the coring element extends along a length of the first bevel grind.
5. The biopsy needle of claim 4 , wherein the cutting edge extends along the entire length of the first bevel grind from the proximal surface of the cutting tip to the pointed end of the cutting tip.
6. The biopsy needle of claim 1 , wherein the lumen is configured to communicate a vacuum from the proximal end to the distal end of the body to provide a suction force to the material to be sampled.
7. The biopsy needle of claim 1 , further comprising a section of body adjacent the distal end having enhanced echogenicity or acoustic reflection.
8. The biopsy needle of claim 1 , further comprising a collet surrounding a portion of the body and having a diameter sufficient to prevent the needle body from entirely passing through a distal end of a sheath of a biopsy device.
9. The biopsy needle of claim 1 , wherein the needle body has an outer diameter in the range of 10-gauge to 30-gauge.
10. The biopsy needle of claim 1 , wherein the needle is comprised of a material selected from the group consisting of nitinol, cobalt chrome, stainless steel, a metal alloy, one or more polymers, nanotube composite, and combinations thereof.