Surgical cutting instrument

A surgical cutting instrument including a nose body, said nose body having a forward end and a rearward end, an opening in said nose body extending through said nose body from said forward end to said rearward end, a shaft support tube having a rearward end extending into the opening from the forward end of said nose body, said shaft support tube having a forward end, means for fixing said rearward end of said shaft support tube in said opening in said nose body, a cutter for cutting, said cutter having a non-cutting drive shaft, said drive shaft extending coaxially through said shaft support tube, an annular passageway being formed between said drive shaft and shaft support tube, said cutter being located forward of the forward end of said shaft support tube, an inlet passageway in said nose body for directing a fluid through said nose body to said opening, a hole in said shaft support tube for directing a fluid from said inlet passageway to said annular passageway, a seal means for sealing is positioned to seal between said drive shaft and said shaft support tube rearwardly of said hole, a bearing means being fixed to said shaft support tube between the forward end of said shaft support tube and said drive shaft, said bearing means providing opening means therethrough, said annular passageway being aligned with said opening means for directing a fluid outwardly therethrough onto said cutter, the forward end of said shaft support tube is formed having a triangular cross-section of three sides, said bearing means including a bearing plate on the inner surface of each side coacting with said drive shaft.

A surgical cutting instrument including a nose body, said nose body having a forward end and a rearward end, an opening in said nose body extending through said nose body from said forward end to said rearward end, a shaft support tube having a rearward end extending into the opening from the forward end of said nose body, said shaft support tube having a forward end, means for fixing said rearward end of said shaft support tube in said opening in said nose body, a cutter for cutting, said cutter having a non-cutting drive shaft, said drive shaft extending coaxially through said shaft support tube, an annular passageway being formed between said drive shaft and shaft support tube, said cutter being located forward of the forward end of said shaft support tube, an inlet passageway in said nose body for directing a fluid through said nose body to said opening, a hole in said shaft support tube for directing a fluid from said inlet passageway to said annular passageway, a seal means for sealing is positioned to seal between said drive shaft and said shaft support tube rearwardly of said hole, a bearing means being fixed to said shaft support tube between the forward end of said shaft support tube and said drive shaft, said bearing means providing opening means therethrough, said annular passageway being aligned with said opening means for directing a fluid outwardly therethrough onto said cutter, the forward end of said shaft support tube is formed having a triangular cross-section of three sides and three angular corners, said bearing means including a bearing member in each angular corner coacting with said drive shaft.

A surgical cutting instrument including a nose body, said nose body having a forward end and a rearward end, an opening in said nose body extending through said nose body from said forward end to said rearward end, a shaft support tube having a rearward end extending into the opening from the forward end of said nose body, said shaft support tube having a forward end, means for fixing said rearward end of said shaft support tube in said opening in said nose body, a cutter for cutting, said cutter having a non-cutting drive shaft, said drive shaft extending coaxially through said shaft support tube, an annular passageway being formed between said drive shaft and shaft support tube, said cutter being located forward of the forward end of said shaft support tube, an inlet passageway in said nose body for directing a fluid through said nose body to said opening, a hole in said shaft support tube for directing a fluid from said inlet passageway to said annular passageway, a seal means for sealing is positioned to seal between said drive shaft and said shaft support tube rearwardly of said hole, a bearing means being fixed to said shaft support tube between the forward end of said shaft support tube and said drive shaft, said bearing means providing opening means therethrough, said annular passageway being aligned with said opening means for directing a fluid outwardly therethrough onto said cutter, said bearing means includes a jewel bearing material for a bearing surface.

A surgical cutting instrument including a nose body, said nose body having a forward end and a rearward end, an opening in said nose body extending through said nose body from said forward end to said rearward end, a shaft support tube having a rearward end extending into the opening from the forward end of said nose body, said shaft support tube having a forward end, means for fixing said rearward end of said shaft support tube in said opening in said nose body, a cutter for cutting, said cutter having a non-cutting drive shaft, said drive shaft extending coaxially through said shaft support tube, an annular passageway being formed between said drive shaft and shaft support tube, said cutter being located forward of the forward end of said shaft support tube, an inlet passageway in said nose body for directing a fluid through said nose body to said opening, a hole in said shaft support tube for directing a fluid from said inlet passageway to said annular passageway, a seal means for sealing is positioned to seal between said drive shaft and said shaft support tube rearwardly of said hole, a bearing means being fixed to said shaft support tube between the forward end of said shaft support tube and said drive shaft, said bearing means providing opening means therethrough, said annular passageway being aligned with said opening means for directing a fluid outwardly therethrough onto said cutter, said bearing means comprises projection members, cut-out sections being equally spaced around said shaft support tube, a projection member being placed in each cut-out section extending into said shaft support tube to coact with said drive shaft, means fixing said projection members to said shaft support tube.