Tissue removal devices and methods
Devices and methods for tissue removal are disclosed herein, including those in which a powered rotary tool actuates a cutting blade to sever tissue and drives an auger to transport the severed tissue proximally through the device. The severed tissue can be collected in an on-board collection chamber for subsequent use as graft material or otherwise (e.g., assay, analysis, post-processing, etc.). Devices of the type disclosed herein can reduce or eliminate the need to move the device in and out of the surgical site, reduce user input force, and provide improved ergonomics and increased user focus.
1. A tissue cutting device, comprising:
a footplate;
a blade having a cutting surface, wherein the blade is movable relative to the footplate between an open position in which a tissue opening is formed between the cutting surface and the footplate and a closed position in which the cutting surface contacts or approaches the footplate to cut tissue disposed therebetween;
an auger disposed in a lumen of the device and configured to transport tissue cut by the blade proximally through the lumen; and
an input shaft, wherein the input shaft is coupled to a blade drive assembly that converts rotational movement of the input shaft into reciprocating movement of the blade between the open and closed positions and wherein the input shaft is coupled to an auger drive assembly that converts the rotational movement of the input shaft into rotating movement of the auger.
2. The device of claim 1 , wherein the lumen is formed in the blade.
3. The device of claim 1 , wherein the lumen is formed in an outer shaft of the device, the blade being slidably disposed in the outer shaft.
4. The device of claim 1 , wherein the blade includes an elongate body portion and a basket pivotally coupled to a distal end of the body portion.
5. The device of claim 1 , wherein the blade includes a tubular cannulated body with a sharpened distal-facing surface that defines the cutting surface.
6. The device of claim 1 , further comprising a tissue collection chamber mounted to the device and in fluid communication with the lumen.
7. The device of claim 6 , wherein the tissue collection chamber is mounted to an outer shaft of the device and wherein the tissue collection chamber comprises a first prong that extends through an opening in the outer shaft to wipe tissue from the blade.
8. The device of claim 7 , wherein the tissue collection chamber comprises a second prong that extends through the opening in the outer shaft and through an opening formed in the blade to wipe tissue from the auger.
9. The device of claim 1 , wherein the auger drive assembly comprises a first plurality of gears configured to scale rotation of the auger relative to rotation of the input shaft.
10. The device of claim 1 , wherein the blade drive assembly comprises a second plurality of gears configured to convert the rotational movement of the input shaft into longitudinal reciprocating movement of the blade.
11. The device of claim 1 , wherein the blade drive assembly comprises a first linkage bar having a first end eccentrically coupled to a rotating shaft and a second end coupled to a rocker arm such that rotation of the rotating shaft alternately rotates the rocker arm clockwise and counterclockwise to alternately advance and retract the blade.
12. The device of claim 1 , wherein a shaft of the auger comprises a plurality of modular sections with different profiles configured to mix, shear, or grind tissue.
13. The device of claim 1 , further comprising an aspiration port through which vacuum suction can be applied to an interior of the lumen.
14. The device of claim 1 , further comprising an irrigation port through which fluid can be supplied to an interior of the lumen.
15. The device of claim 1 , wherein the tissue collection chamber comprises a neck portion having a longitudinal axis that extends substantially perpendicular to a longitudinal axis of the blade and a canister portion in fluid communication with the neck portion.