Disposable soft tissue biopsy apparatus
First Claim
1. A soft tissue biopsy apparatus incorporating a cannula means and a needle means for obtaining a tissue specimen comprising:
- an elongate housing having an opening at the front end thereof;
a hollow cannula means positioned within said housing, and reciprocally movable therewithin, one end of said cannula means extending through said opening for insertion into tissue from which a specimen is to be taken;
a needle means positioned within said cannula means and reciprocally movable therewithin, said needle means also having an end extending through said opening for insertion into the tissue and a sampling means adjacent said end in which a tissue specimen is capturable;
slide means to which the needle means is operably connected and capable of moving said needle means independently of said cannula means;
cocking means manually operable by a user of the apparatus for moving the slide means to a selected position prior to insertion of said cannula means and needle means into the tissue, whereby rearward movement of said slide means shifts said needle means and said cannula means from a first position to a second position;
release means operable by the user after insertion of said cannula means and needle means into the tissue for initially returning said needle means to its first position and for then moving said cannula means relative to said needle means towards said first position, and movement of the cannula means into a position causing the end of the cannula means to cover the sampling means of the needle means whereby the tissue specimen is captured between said cannula means and needle means;
spring means providing a force biasing the cannula means and needle means to their respective first positions, and a motive force for moving the respective means upon operation of the release means;
said cannula means including a cannula assembly and the needle means including a stylet assembly;
said cannula assembly including a cannula, a pedestal at one end to which the cannula is connected and from the other end of which a concentric, hollow extension of the cannula extends; and
the stylet assembly including a stylet, a base to which one end of the stylet is attached, and means interlocking with the pedestal to limit movement of the cannula assembly.
8 Assignments
0 Petitions
Accused Products
Abstract
Soft tissue biopsy apparatus (10) for obtaining a tissue specimen. An elongate housing (12) has an opening (20) at one end (14). A hollow cannula (26) is positioned within the housing, is reciprocally movable therewithin, and one end (28) of the needle extends through the opening for insertion into tissue (T) from which a specimen is to be taken. A needle (44) is positioned within the cannula, is reciprocally movable therewithin, and also has an end (46) extending through the opening for insertion into the tissue. This needle has a recess (50) adjacent its outer end in which a tissue specimen is captured. The needle is connected to a slide (68) by which the needle is moved independently of the cannula. A sleeve (110) installed over the housing is manually operable to move the slide to a selected and cocked position prior to insertion of the cannula/needle into the tissue. Movement of the slide moves the second needle from a first position to a second position while the cannula remains stationary. A release mechanism (114) operable by the user after insertion of the assembly into the tissue initially returns the needle to its first position and then moves the cannula from a first position to a second position. Movement of the cannula to its second position causes the end of the said cannula to cover the end of the needle to capture the tissue speciment within the recess.
-
Citations
26 Claims
-
1. A soft tissue biopsy apparatus incorporating a cannula means and a needle means for obtaining a tissue specimen comprising:
-
an elongate housing having an opening at the front end thereof; a hollow cannula means positioned within said housing, and reciprocally movable therewithin, one end of said cannula means extending through said opening for insertion into tissue from which a specimen is to be taken; a needle means positioned within said cannula means and reciprocally movable therewithin, said needle means also having an end extending through said opening for insertion into the tissue and a sampling means adjacent said end in which a tissue specimen is capturable; slide means to which the needle means is operably connected and capable of moving said needle means independently of said cannula means; cocking means manually operable by a user of the apparatus for moving the slide means to a selected position prior to insertion of said cannula means and needle means into the tissue, whereby rearward movement of said slide means shifts said needle means and said cannula means from a first position to a second position; release means operable by the user after insertion of said cannula means and needle means into the tissue for initially returning said needle means to its first position and for then moving said cannula means relative to said needle means towards said first position, and movement of the cannula means into a position causing the end of the cannula means to cover the sampling means of the needle means whereby the tissue specimen is captured between said cannula means and needle means; spring means providing a force biasing the cannula means and needle means to their respective first positions, and a motive force for moving the respective means upon operation of the release means; said cannula means including a cannula assembly and the needle means including a stylet assembly; said cannula assembly including a cannula, a pedestal at one end to which the cannula is connected and from the other end of which a concentric, hollow extension of the cannula extends; and the stylet assembly including a stylet, a base to which one end of the stylet is attached, and means interlocking with the pedestal to limit movement of the cannula assembly. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
-
Specification