Arthroscopic devices and methods
A medical device includes an elongated sleeve having a longitudinal axis, a proximal end and a distal end. A ceramic cutting member includes both a cutting window having sharp edges and one or more flutes with cutting burrs circumferentially spaced-apart from the cutting window. An electrode may be placed between a pair of flutes and opposite to the cutting window. A motor drive is coupled to the proximal end of the elongated sleeve to rotate the ceramic cutting member cut bone with the flute(s) and soft tissue with the cutting window. The electrode provides cautery or radiofrequency ablation of tissue when the sleeve and ceramic cutting member are not being rotated.
1. A medical device for removing tissue in a patient, comprising:
an elongated outer sleeve having a distal cut-out; and
a ceramic cutting member rotatably disposed in the elongated outer sleeve for exposure in the distal cut-out, the ceramic cutting member having a longitudinal axis that extends between a proximal end and a distal end of the ceramic cutting member,
wherein a cutting window with at least a first sharp window cutting edge is formed in the ceramic cutting member, the first sharp window cutting edge including a distal end and a proximal end and being configured to cut soft tissue as the cutting member is rotated or rotationally oscillated and engaged against soft tissue; and
wherein at least a first flute with a first burr cutting edge is formed in the ceramic cutting member, the first burr cutting edge including a distal end and a proximal end and being configured to cut bone as the cutting member is rotated or rotationally oscillated and engaged against bone, wherein the first burr cutting edge is circumferentially spaced-apart from the first sharp window cutting edge around the ceramic cutting member with the first burr cutting edge extending at least partially alongside the first sharp window cutting edge in an axial direction along the ceramic cutting member, the proximal end of the first burr cutting edge extending proximally of the distal end of the first sharp window cutting edge in the axial direction along the ceramic cutting member.
2. The medical device of claim 1 , further comprising an electrode carried on the ceramic cutting member.
3. The medical device of claim 2 , wherein said electrode is disposed circumferentially between the first flute and a second flute around the ceramic cutting member.
4. The medical device of claim 3 , wherein the cutting window is disposed circumferentially between the first flute and the second flute but is diametrically opposed to the electrode on the ceramic cutting member.
5. The medical device of claim 3 , wherein the first flute and the second flute are asymmetrically positioned relative to the longitudinal axis of the ceramic cutting member.
6. The medical device of claim 1 , further comprising an inner sleeve, the ceramic cutting member carried on a distal end of the inner sleeve, wherein the cutting window opens to a central channel in the ceramic cutting member that communicates with an interior channel in the inner sleeve, wherein the interior channel is configured to be connected to a negative pressure source to aspirate material cut by the cutting window and/or the first flute.
7. The medical device of claim 1 , wherein the first sharp window cutting edge is aligned generally with the longitudinal axis of the ceramic cutting member.
8. The medical device of claim 1 , wherein the first burr cutting edge is aligned generally with the longitudinal axis of the ceramic cutting member.
9. The medical device of claim 1 , wherein the first flute has an axial length in the range of 4 mm to 8 mm.
10. A medical device for removing tissue in a patient, comprising:
an elongated outer sleeve having a distal cut-out;
a ceramic cutting member rotatably disposed in the elongated outer sleeve for exposure in the distal cut-out, the ceramic cutting member having a longitudinal axis that extends between a proximal end and a distal end of the ceramic cutting member; and
an electrode carried on the ceramic cutting member,
wherein a cutting window with at least a first sharp window cutting edge is formed in the ceramic cutting member, the first sharp window cutting edge configured to cut soft tissue as the cutting member is rotated or rotationally oscillated and engaged against soft tissue,
wherein at least a first flute and a second flute with a first burr cutting edge and a second burr cutting edge, respectively, are formed in the ceramic cutting member, the first burr cutting edge and the second burr cutting edge configured to cut bone as the cutting member is rotated or rotationally oscillated and engaged against bone, wherein the first burr cutting edge and the second burr cutting edge are circumferentially spaced-apart from the first sharp window cutting edge around the ceramic cutting member,
wherein the cutting window is disposed circumferentially between the first flute and the second flute, and wherein electrode is also disposed circumferentially between the first flute and the second flute but is diametrically opposed to the electrode on the ceramic cutting member.
11. The medical device of claim 10 , wherein the first burr cutting edge and the second burr cutting edge are aligned generally with the longitudinal axis of the ceramic cutting member.
12. The medical device of claim 10 , wherein the first flute and the second flute are asymmetrically positioned relative to the longitudinal axis of the ceramic cutting member.
13. A medical device for removing tissue in a patient, comprising:
an elongated outer sleeve having a distal cut-out; and
a ceramic cutting member rotatably disposed in the elongated outer sleeve for exposure in the distal cut-out, the ceramic cutting member having a longitudinal axis that extends between a proximal end and a distal end of the ceramic cutting member,
wherein a cutting window with a first sharp window cutting edge is formed in the ceramic cutting member, the first sharp window cutting edge located between a distal end and a proximal end of the window in an outer surface of the ceramic cutting member, the first sharp window cutting edge being configured to cut soft tissue as the cutting member is rotated or rotationally oscillated and engaged against soft tissue,
wherein at least a first flute with a first burr cutting edge is formed in the ceramic cutting member, the first burr cutting edge including a distal end and a proximal end and being configured to cut bone as the cutting member is rotated or rotationally oscillated and engaged against bone, wherein the first burr cutting edge is circumferentially spaced-apart from the first sharp window cutting edge around the ceramic cutting member with the distal end of the window extending distally of the distal end of the first burr cutting edge in the axial direction along the ceramic cutting member and with the proximal end of the window extending proximally of the proximal end of the first burr cutting edge in the axial direction along the ceramic cutting member.
14. The medical device of claim 13 , further comprising an electrode carried on the ceramic cutting member.
15. The medical device of claim 14 , wherein said electrode is disposed circumferentially between the first flute and a second flute around the ceramic cutting member.
16. The medical device of claim 15 , wherein the cutting window is disposed circumferentially between the first flute and the second flute but is diametrically opposed to the electrode on the ceramic cutting member.
17. The medical device of claim 15 , wherein the first flute and the second flute are asymmetrically positioned relative to the longitudinal axis of the ceramic cutting member.
18. The medical device of claim 13 , wherein the first flute has an axial length in the range of 4 mm to 8 mm.
19. The medical device of claim 13 , wherein the first sharp window cutting edge is aligned generally with the longitudinal axis of the ceramic cutting member.
20. The medical device of claim 13 , wherein the first burr cutting edge is aligned generally with the longitudinal axis of the ceramic cutting member.