Adjustable sample size tissue sampling device

摘要

Among other things, there is disclosed a biopsy needle capable of taking samples of varying size. In particular embodiments, a user selects one of a plurality of sample-size settings, which sets the needle to a particular cannula throw-length by moving an internal wall against which a spring engages. For a shorter throw, the wall is in a forward position and the cannula is retracted the smaller amount to compress the spring. For a longer throw, the wall is in a rearward position and the cannula is retracted a larger amount to compress the spring.

主权项

1. An adjustable-throw biopsy needle, comprising:
an elongated tissue-cutting member; a housing connected to said tissue-cutting member for propelling said tissue-cutting member forward into tissue when a tissue sample is desired, said housing including a wall within said housing movable between at least a first and second position and a spring that engages said wall, wherein said first position corresponds to a first throw-length of said tissue-cutting member with respect to said housing whereby a first size of tissue sample can be obtained, and said second position corresponds to a second throw-length of said tissue-cutting member with respect to said housing whereby a second size of tissue sample can be obtained.