Vacuum-assisted soft tissue biopsy device
Devices and methods used to obtain a tissue sample utilizing a vacuum assist are disclosed. The devices include a handle, an inner cannula, and an outer cannula. The devices include a vacuum tube in communication with a sample notch of the inner cannula. The handle is actuated to drive the inner cannula into a lesion such that the sample notch is disposed within the lesion. A vacuum is generated in the vacuum tube and the sample notch as the stylet is driven into the lesion. A tissue sample is sucked into the sample notch and the outer cannula is displaced over the sample notch to sever the tissue sample from the lesion.
1 . A biopsy device, comprising:
a shell comprising:
a stationary shoulder;
a first actuator comprising:
a first recess; and
a second recess; and
a second actuator comprising a protrusion;
an arming slide disposed within the shell, the arming slide comprising a hub catch;
a first hub comprising:
a first cantilever arm comprising a first trigger catch and configured to operatively engage with the stationary shoulder; and
a first load catch configured to engage with the hub catch;
a second hub comprising:
a second cantilever arm comprising a second trigger catch configured to operatively engage with the stationary shoulder; and
a second load catch configured to engage with the hub catch;
a vacuum member comprising:
a tube defining a vacuum chamber; and
a piston slidably disposed within the vacuum chamber;
an inner cannula coupled to the first hub and in fluid communication with the vacuum chamber; and
an outer cannula coupled to the second hub and co-axially disposed over the inner cannula.
2 . The biopsy device of claim 1 , wherein a depth of the first recess is less than a depth of the second recess.
3 . The biopsy device of claim 1 , wherein the hub catch comprises an inner cannula hub catch having a triangular shape and an outer cannula hub catch having a triangular shape.
4 . The biopsy device of claim 3 , wherein the first load catch is configured to receive the inner cannula hub catch and the second load catch is configured to receive the outer cannula hub catch.
5 . The biopsy device of claim 1 ,
wherein the piston is coupled to the first hub; and
wherein a vacuum is generated in the vacuum chamber when the first hub is displaced from a proximal position to a distal position.
6 . The biopsy device of claim 1 , wherein the inner cannula comprises:
a proximal inner cannula portion coupled to the first hub;
a distal inner cannula portion co-axially disposed over the proximal inner cannula;
a sample notch disposed in the distal inner cannula adjacent a distal end of the inner cannula; and
a trocar tip disposed in the distal end of the distal inner cannula;
wherein the sample notch is in fluid communication with the vacuum chamber and is configured to receive a tissue sample.
7 . The biopsy device of claim 1 , wherein the outer cannula comprises a beveled tip configured to sever a tissue sample.
8 . The biopsy device of claim 1 , wherein the outer cannula comprises depth markings disposed along a length of the outer cannula.
9 . The biopsy device of claim 1 , further comprising an adjustable penetration depth member, the adjustable penetration depth member comprising:
a threaded stop;
an adjustment wheel threadingly coupled to the threaded stop; and
an indicium coupled to indicia of the shell and configured to indicate a needle penetration depth.
10 . The biopsy device of claim 1 , wherein the arming slide comprises:
a finger grip; and
a return spring configured to return the arming slide from a proximal position to a distal position.
11 . The biopsy device of claim 1 ,
wherein the first hub further comprises a first drive spring configured to displace the first hub from a proximal position to a distal position; and
wherein the second hub further comprises a second drive spring configured to displace the second hub from a proximal position to a distal position.