Full Core Biopsy Device

摘要

A biopsy device includes coaxially disposed inner and outer needles in which the outer needle tip is configured for obtaining a tissue sample. The inner surface of the outer needle includes a tissue retention feature which may include a countersink and/or a feature formed in the inner surface. The device may be introduced to a biopsy site through an introducer in which the introducer is vented and/or a certain ratio of introducer inner diameter and biopsy device outer diameter is maintained. The full core devices also permit a tighter tolerance between the I.D. and O.D. of the outer cannula and stylet, respectively, which further permits the use of a smaller gage introducer. Full devices also include a sample trap assembly operable to enlarge the sample cavity after the full core sample has been obtained.

主权项

1. A biopsy device comprising:
an outer needle hub; an outer needle coupled at a proximal end to the outer needle hub, the outer needle including:
an outer needle tip at an opposite distal end;a tissue slicing feature defined at said tip configured for cutting tissue; andan inner surface including a countersink formed at said tip; an inner needle hub; an inner needle coupled at a proximal end to said inner needle hub, the inner needle including an inner needle tip at an opposite distal end, said inner needle coaxially disposed within said outer needle; wherein the outer needle has an inner diameter and the inner needle has an outer diameter sized for a close running fit within the outer needle; a mechanism engaged between the outer needle hub and inner needle hub and operable in a retracted position to maintain the inner needle and outer needle in a predetermined position with the tip of the inner needle proximal the tip of the outer needle, and operable in an actuated position to advance the outer needle over the inner needle to obtain a tissue sample; and an introducer cannula sized to receive the outer needle of the biopsy device therethrough for introduction into a patient.