A biopsy instrument for use in a biopsy gun includes a hollow outer needle defining
a lumen therethrough and an inner needle slidably engaged within the lumen. The
inner needle defines a cavity adjacent its distal end for receiving a tissue sample.
A first hub is attached to the proximal end of the inner needle, and a second hub
is attached to the proximal end of the outer needle. An elongated pin having a
first end and a second end is fixedly attached to the first hub at the first end
of the pin. The second end is in contact with the second hub so that the hub and
pin are slideable relative to each other. A stop engagement between the second
end of the pin and the second hub is configure to prevent disengagement of the
needles and to maintain a specific physical relationship between the hubs.
