Method, system and device for tissue removal
View Patent ↗A method and device for tissue removal. The device may be used to remove uterine fibroids and other abnormal gynecological tissue. According to one embodiment, the device includes a housing, an outer tube, and an inner tube. The outer tube is fixed to the housing and includes a side window proximate to its distal end. The side window may have sloped proximal and distal ends. The inner tube has a distal end positioned within the outer tube, the distal end being adapted to rotate and, at the same time, to move back and forth past the side window, with the rotational and translational movement of the inner tube being independently controllable. The distal end of the inner tube may have an external bevel. Suction is applied to the proximal end of the inner tube to draw tissue into the side window and to remove resected tissue through the inner tube.
1. A uterine fibroid tissue removal device, comprising:
an elongate outer tubular member having an outside diameter of no more than about 3.5 mm, the outer tubular member including a tissue receiving side window configured to receive uterine fibroid tissue to be severed from a uterus wall;
an inner tubular member positioned within the outer tubular member, the inner tubular member comprising a proximal end, an open distal end, and a tissue aspiration lumen extending therebetween;
a translational drive configured to oscillate the inner tubular member translationally along a longitudinal axis of the inner tubular member, such that the open distal end of the inner tubular member oscillates translationally across the tissue receiving side window of the outer tubular member to thereby sever uterine fibroid tissue extending therethrough; and
a rotational drive that rotates the inner tubular member at a rate of at least 5000 revolutions per minute about the longitudinal axis of the inner tubular member while the inner tubular member oscillates translationally across the tissue receiving side window, such that the device is capable of removing uterine fibroid tissue severed by the inner tubular member at a rate of at least about 1.8 gm/min.
2. The tissue removal device of claim 1 , wherein
the rotational drive comprises a rotational driving mechanism mechanically coupling a first drive shaft to the inner tubular member to transfer rotational energy from the first drive shaft to the inner tubular member to thereby rotate the inner tubular member about the longitudinal axis of the inner tubular member; and wherein
the translational drive comprises an oscillating translational driving mechanism mechanically coupling a second drive shaft to the inner tubular member to transfer translating energy from the second drive shaft to the inner tubular member to thereby oscillate translationally the inner tubular member along the longitudinal axis of the inner tubular member.
3. The tissue removal device of claim 1 , further comprising a vacuum source in communication with the tissue aspiration lumen of the inner tubular member.
4. The tissue removal device of claim 1 , wherein at least a portion of the outer tubular member is flexible.
5. The tissue removal device of claim 4 , wherein at least a portion of the inner tubular member is flexible.
6. The tissue removal device of claim 1 , further comprising a housing coupled to the outer tubular member.
7. The tissue removal device of claim 6 , wherein the outer tubular member is coupled to the housing in a non-coaxial manner.
8. The tissue removal device of claim 1 , wherein the rotational drive rotates the inner tubular member at a rate of approximately 6000 revolutions per minute, and the translational drive is configured to translationally oscillate the inner tubular member at a rate of approximately 240 cycles per minute.
9. The tissue removal device of claim 8 , wherein an advance ratio equal to a ratio of the rate of oscillation to the rate of rotation of the inner tubular member is less than 0.25.
10. The tissue removal device of claim 1 , wherein the open distal end of the inner tubular member has an external bevel.
11. The tissue removal device of claim 1 , wherein the tissue receiving side window on the outer tubular member has sloped or jagged distal and proximal ends.