Biopsy Method and Apparatus

摘要

A tissue sampling apparatus and method obtain a sample of tissue from a selected site and place a hemostatic plug at the selected site. The apparatus includes an external needle and an internal needle within the external needle. A chamber in the internal needle is divided by a divider member into a plug compartment for receiving a hemostatic plug, and a sample compartment for receiving a tissue sample. The divider member is resiliently biased into the plug compartment and the internal needle is movable relative to the external needle for admitting the hemostatic plug into the plug compartment and displacing the divider member into the sample compartment, and then closing the chamber. The apparatus then is advanced to the selected site where relative movement between the internal and external needles opens the chamber, allowing the divider member to expel the hemostatic plug from the plug compartment, and admitting a tissue sample into the sample compartment. Subsequent relative movement between the internal and external needles cuts the tissue sample from the surrounding tissue for removal from the selected site upon removal of the apparatus, while the expelled hemostatic plug remains at the site.

主权项

1. A tissue sampling apparatus for obtaining a sample of tissue from a selected site and for placing a hemostatic plug at the selected site, the apparatus comprising:
an external needle having an internal passage and a tissue-cutting edge; an internal needle within the internal passage, the internal needle terminating at a forward tissue-penetrating tip and having a chamber adjacent the tissue-penetrating tip, the internal needle and the external needle being selectively movable relative to one another between a first position, wherein the chamber is closed by the external needle, and a second position, wherein the chamber is open; a divider member dividing the chamber into opposite compartments, including a plug compartment for receiving a hemostatic plug, and a sample compartment for receiving a tissue sample, the divider member being movable for displacement from within one to within the other of the opposite plug and sample compartments; and a biasing mechanism enabling displacement of the divider member into the sample compartment for accommodating a hemostatic plug within the plug compartment, when the plug compartment is closed by the external needle, and effecting displacement of the divider member out of the sample compartment and into the plug compartment for expelling the hemostatic plug out of the plug compartment and for admitting a tissue sample from surrounding tissue into the sample compartment upon opening the plug compartment; whereby, upon subsequent relative movement between the internal needle and the external needle to place the internal needle and the external needle into the first position, the tissue sample within the sample compartment will be cut from the surrounding tissue for removal upon removal of the tissue sample apparatus from the selected site, while the expelled hemostatic plug will remain at the site.