Biopsy needle

Claim 1

A biopsy needle comprising: a. tubular cannula means including a longitudinal cannula with a knife sharp edge, said tubular cannula means including handle means for handily supporting said tubular cannula means, said handle means including a truncated conical member secured about an upper portion of said tubular cannula means and opposing vertically oriented handle wings extending outward from said truncated conical member, a rim cylindrical member positioned on said truncated conical member, and means for interlocking extending outward on said rim, said interlocking means including a button projection; b. stylet means for engaging into said tubular cannula means and protruding forward of said tubular cannula means for piercing through skin, flesh, muscle and bone, including a sharpened angled edge and cap means having supporting positive detent interlocking means for engaging or twisting with said interlocking means of said sample means oriented by said engagement of said interlocking means within said positive detent interlocking means on said cap means, said cap means supporting said stylet means; and c. said beveled edge of said tubular cannula means and said edge of said stylet means being substantially aligned on a vertical axis with respect to each other, said knife-sharp edge of said cannula has an angular tip relationship so that the offset of the cannual wall satisfies 1/2(tan (bevel angle) tan(tip angle) (I.D. cannula tube)) whereby said tubular cannula means and said stylet means engage in predetermined oriented relationship with said interlocking means and said positive detent interlocking means thereby provide a positive detent interlocking between said sample means and said protruding means for taking a biopsy sample.