Surgical tool arrangement and surgical cutting accessory for use therewith
A surgical tool arrangement for performing endoscopic surgical procedures which includes a powered handpiece and a surgical cutting accessory which detachably connects to the handpiece. The cutting accessory incorporates a cutting head for resecting tissue and a suction arrangement at the distal end of the cutting accessory closely adjacent the cutting head which suction arrangement serves to evacuate tissue from the surgical site and additionally serves as a cleaning mechanism for the surgical cutting accessory. The accessory additionally incorporates a bearing arrangement for supporting the cutting element as same rotates within the housing element.
1 . A surgical cutting accessory comprising:
an outer shaft extending along a longitudinal axis from a proximal end of the outer shaft to a distal end of the outer shaft, the outer shaft having a window at the distal end of the outer shaft; and
an inner cutting shaft extending along the longitudinal axis from a proximal end of the inner cutting shaft to a distal end of the inner cutting shaft, the inner cutting shaft being disposed within the outer shaft such that the inner cutting shaft is rotatable within the outer shaft, the inner cutting shaft comprising:
a bearing portion having an outer bearing surface in operative communication with an inner surface of the outer shaft;
a suction opening extending through a wall of the inner cutting shaft into the inner cutting shaft; and
a cutting head extending along the longitudinal axis to the distal end of the inner cutting shaft such that the bearing portion is in between the proximal end of the inner cutting shaft and the cutting head,
wherein the suction opening is proximate to the cutting head and is exposed through the window of the outer shaft in at least some rotational positions of the inner cutting shaft, and
wherein the window of the outer shaft extends along the longitudinal axis such that at least part of the window and at least part of the cutting head are a first distance from the proximal end of the inner cutting shaft,
wherein the suction opening is positioned such that a distal part of the bearing portion is in between the suction opening and the cutting head.
2 . The surgical cutting accessory of claim 1 , wherein at least one of the inner surface of the outer shaft and the outer bearing surface of the bearing portion are wear-resistant.
3 . The surgical cutting accessory of claim 2 , wherein the wear resistance of the at least one of the inner surface of the outer shaft and the outer bearing surface of the bearing portion is provided through a coating of a wear-resistant material.
4 . The surgical cutting accessory of claim 1 , wherein the bearing portion is in between a proximal inner shaft portion and the cutting head, and a first diameter of the bearing portion is greater than a second diameter of the proximal inner shaft portion.
5 . The surgical cutting accessory of claim 1 , wherein the bearing portion and the cutting head are part of a single monolithic component of the inner cutting shaft.
6 . The surgical cutting accessory of claim 1 , wherein the inner surface of the outer shaft and the outer bearing surface of the bearing portion are stainless steel.
7 . The surgical cutting accessory of claim 1 , wherein the bearing portion and the cutting head are disposed in a distal portion of the outer shaft and the inner surface of the outer shaft is defined by a first radius throughout the distal portion of the outer shaft, a majority of the cutting head and a sub-portion of the distal portion of the outer shaft extending together over a single distance along the longitudinal axis.
8 . The surgical cutting accessory of claim 1 , wherein the suction opening is defined in part by an outer edge abutting the bearing portion.
9 . The surgical cutting accessory of claim 8 , wherein the bearing portion at the outer edge has a first diameter that is a maximum diameter of the inner cutting shaft.
10 . A surgical cutting accessory comprising:
an outer shaft extending along a longitudinal axis from a proximal end of the outer shaft to a distal end of the outer shaft, the outer shaft having a window at the distal end of the outer shaft; and
an inner cutting shaft extending along the longitudinal axis from a proximal end of the inner cutting shaft to a distal end of the inner cutting shaft, the inner cutting shaft being disposed within the outer shaft such that the inner cutting shaft is rotatable within the outer shaft, the inner cutting shaft comprising:
an intermediate portion spaced apart from the proximal end of the inner cutting shaft, the intermediate portion having an outer bearing surface cooperating with an inner surface of the outer shaft, a sub-portion of the outer bearing surface being exposed through the window in at least some rotational positions of the inner cutting shaft;
a suction opening; and
a cutting head extending along the longitudinal axis to the distal end of the inner cutting shaft such that the intermediate portion is in between the proximal end of the inner cutting shaft and the cutting head, the cutting head being exposed through the window such that part of the cutting head faces the outer shaft,
wherein the suction opening is exposed through the window of the outer shaft in at least some rotational positions of the inner cutting shaft.
11 . The surgical cutting accessory of claim 10 , wherein at least one of the inner surface of the outer shaft and the outer bearing surface of the intermediate portion are wear-resistant.
12 . The surgical cutting accessory of claim 11 , wherein the wear resistance of the at least one of the inner surface of the outer shaft and the outer bearing surface of the intermediate portion is provided through a coating of a wear-resistant material.
13 . The surgical cutting accessory of claim 10 , wherein the intermediate portion is in between a proximal portion of the inner cutting shaft and the cutting head, and a first diameter of the intermediate portion is greater than a second diameter of the proximal portion.
14 . The surgical cutting accessory of claim 10 , wherein the intermediate portion and the cutting head are part of a single monolithic component of the inner cutting shaft.
15 . The surgical cutting accessory of claim 10 , wherein the inner surface of the outer shaft and the outer bearing surface of the intermediate portion are stainless steel.
16 . The surgical cutting accessory of claim 10 , wherein the intermediate portion and the cutting head are disposed in a distal portion of the outer shaft, and the inner surface of the outer shaft has a first diameter throughout the distal portion of the outer shaft.
17 . The surgical cutting accessory of claim 10 , wherein the intermediate portion has a first diameter that is a maximum diameter of the inner cutting shaft.
18 . A method of operating a surgical cutting accessory comprising:
providing a surgical cutting accessory comprising:
an outer shaft extending along a longitudinal axis from a proximal end of the outer shaft to a distal end of the outer shaft, the outer shaft having a window at the distal end of the outer shaft; and
an inner cutting shaft extending along the longitudinal axis from a proximal end of the inner cutting shaft to a distal end of the inner cutting shaft, the inner cutting shaft being disposed within the outer shaft such that the inner cutting shaft is rotatable within the outer shaft, the inner cutting shaft comprising:
a bearing portion having an outer bearing surface in operative communication with an inner surface of the outer shaft;
a suction opening extending through a wall of the inner cutting shaft into the inner cutting shaft; and
a cutting head extending along the longitudinal axis to the distal end of the inner cutting shaft such that the bearing portion is in between the proximal end of the inner cutting shaft and the cutting head,
wherein the suction opening is proximate to the cutting head and is exposed through the window of the outer shaft in at least some rotational positions of the inner cutting shaft,
wherein the window of the outer shaft extends along the longitudinal axis such that at least part of the window and at least part of the cutting head are a first distance from the proximal end of the inner cutting shaft, and
wherein the suction opening is positioned such that a distal part of the bearing portion is in between the suction opening and the cutting head,
bringing the surgical cutting accessory into contact with tissue at a surgical site of a patient; and
actuating the inner cutting shaft such that the inner cutting shaft rotates about the longitudinal axis and displaces at least some tissue at the surgical site.
19 . The method of claim 18 , further comprising positioning the cutting head to remove target tissue at the surgical site such that any removed tissue collected proximate the suction opening is cut by interaction between an edge of the window and an edge of the suction opening to prevent blockage of the suction opening.