1. A medical handpiece comprising:
a cutting tool having a flexible shank and a cutting bur provided at a distal end of said shank for cutting a treatment site,
a tubular casing for receiving the cutting tool therein,
wherein said casing and said cutting tool are flexible for a predetermined angular range, where the casing undergoes plastic deformation and the shank of the cutting tool undergoes elastic deformation,
a handpiece body detachably holding a proximal end of the cutting tool and transmitting power from a drive source to the cutting tool,
a plurality of bearing members disposed in the casing,
an inner flexible tubular intervening member for receiving the shank of the cutting tool therein, wherein said inner intervening member is composed of a plurality of segments, each segment being arranged between or on distal or proximal side of said bearing members, and
an outer flexible tubular intervening member arranged around said inner intervening member, wherein said outer intervening member is composed of a plurality of segments, each segment being arranged between or on distal or proximal side of said bearing members,
wherein each segment of said outer intervening member is further composed of a plurality of sub-segments, and a plurality of annular members having the outer diameter that is larger than the outer diameter of said outer intervening member are arranged between said sub-segments of the outer intervening member.
2. The medical handpiece according to claim 1, wherein said annular members are fit on the outer surface of the inner intervening member.
3. The medical handpiece according to claim 1, wherein said annular members are fit on the inner surface of the casing.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A polypropylene fiber comprising at least 100 ppm of a nucleator which does not impart visible color to said fiber; wherein said fiber is textured; wherein said polypropylene fiber exhibits a denier of at least 5 dpf; and wherein said fiber demonstrates tensile strength such that said fiber exhibits no appreciable breakage when exposed to spinning of at least about 1000 metersminute.
2. The fiber of claim 1 wherein said fiber exhibits no appreciable breakage when exposed to spinning of at least about 2000 metersminute.
3. The polypropylene fiber as recited in claim 1, wherein said nucleator is selected from the group consisting of DBS, MDBS, DMDBS, NA-11, and NA-21.