Autoclavable dental handpiece with disposable high speed turbine

Claim 2

A high-speed dental/medical handpiece, the handpiece including: a body comprising a sleeve and a head at an end of said sleeve, said head having an opening; said sleeve carrying at least an air input tube, said air input tube being operatively connectable to a source of air, said body being made of an autoclavable material; and a cartridge removably received in said opening of said head of said body to removably receive a dental bit; said cartridge including a hollow cartridge body, a cap which closes said cartridge body, and a turbine; said cap and body cooperating to define a chamber which receives said turbine; said cartridge including an air input opening which is in communication with said air input line to provide operating air to drive said turbine and an exhaust outlet to exhaust said operating air from said chamber; said cartridge including a retainer to hold said cartridge in said body head during operation of said high-speed handpiece.

Claim 3

The handpiece of claim 1 wherein said body is made of metal and said cartridge is made of plastic and is disposable.

Claim 4

The handpiece of claim 1 wherein said sleeve carries an optic tube, said optic tube being operably connectable to a source of light and extending through said sleeve to provide light to a workarea in a patient's mouth where the bit is being used; said optic tube being removable from said handpiece.

Claim 5

The handpiece of claim 3 wherein said sleeve carries a water supply tube, said cartridge including a bore having an inlet in communication with said water supply tube and an outlet, said water supply tube being operably connectable to a source of water; said cartridge water bore being positioned to direct water to said bit.

Claim 6

The handpiece of claim 4 wherein said sleeve defines a forward end adjacent said handpiece body head, said handpiece body including a manifold received near said forward end of said sleeve; said manifold having: a first bore in fluid communication with said air supply tube and positioned to be in communication with said air inlet of said cartridge to place said cartridge chamber in communication with said air supply tube; a second bore in communication with said water supply tube and positioned to be in communication with said second bore in said cartridge to place said bore in communication with said water supply tube; a first longitudinally extending channel in communication with said exhaust outlet of said chamber; said sleeve defining an exhaust air flow path; and a second longitudinally extending channel which receives said optic tube.

Claim 7

The handpiece of claim 5 wherein said first and second channels in said manifold define grooves formed in an outer surface of said manifold.

Claim 8

The handpiece of claim 5 wherein said handpiece includes a connector at a back end thereof for connecting said handpiece to the sources of light, water, and air; said connector including a bore which receives said optic tube and a guide tube extending forwardly from said connector bore through at least a part of said sleeve, said optic tube slidingly extending through said connector bore and guide tube to be received in said manifold second opening, said optic tube being frictionally held in place by said guide tube.

Claim 9

The handpiece of claim 3 wherein said cartridge body is at least partially made of a material through which light can pass, said optic tube being in abutting contact with said cartridge body to deliver light into said cartridge body; said cartridge body having a bottom surface surrounding said bit, said light exiting from said cartridge body through said bottom surface and around said bit.

Claim 10

The handpiece of claim 8 wherein said cartridge body directs a portion of the light transmitted by the optic tube directly at the bit to provide a spot light at the bit; said cartridge body including a sloped surface positioned such that light from said optic tube is directed thereat, said sloped surface having an angle such that said sloped surface will reflect the light to the bit.

Claim 11

The handpiece of claim 8 wherein said cartridge includes a cut out in a bottom portion of the body, said sloped surface defining an upper surface of said cutout.

Claim 12

The handpiece of claim 8 wherein said cartridge includes a cut out in an upper portion of said body, said sloped surface defining at least a part of a rear wall of said cut out.

Claim 13

The handpiece of claim 1 wherein said turbine includes turbine blades, said turbine blades being substantially in the shape of an air foil.

Claim 14

The handpiece of claim 1 including an upper bearing and a lower bearing housed in said cartridge chamber; said turbine being positioned between said upper and lower bearings and having a bore; said upper and lower bearings each having a bore; said bores of said turbine and bearings being generally axially aligned with each other; said bore of said turbine being sized to frictionally receive said dental bit and said bores of said bearings being sized to rotatably receive said dental bit.

Claim 15

The handpiece of claim 13 wherein said turbine and bearing bores each have inner surfaces, said bore surfaces being in contact with said dental bit.

Claim 16

The handpiece of claim 13 wherein said bearings comprise bushings.

Claim 17

The handpiece of claim 15 wherein said bearings are made of a self-lubricating material.

Claim 18

The handpiece of claim 15 wherein the bearings are made from plastic.

Claim 19

The handpiece of claim 1 wherein the cartridge includes a shoulder near a bottom thereof, said cartridge shoulder being in abutting relationship with a bottom surface of said head of said handpiece body.

Claim 20

The handpiece of claim 18 wherein said cartridge is frictionally received in the head of the handpiece body.

Claim 21

The handpiece of claim 19 wherein said dental bit is frictionally held in said turbine.

Claim 22

The handpiece of claim 1 wherein said retainer comprises a shoulder formed at a bottom of said cartridge; said head of said handpiece body including a surface surrounding said handpiece body head opening, said shoulder abutting said surface of said handpiece body head.

Claim 23

A high-speed medical/dental handpiece, the handpiece including: a body comprising a sleeve and a head at an end of said sleeve; said sleeve carrying at least an air input tube, said air input tube being operatively connectable to a source of air, said body being made of an autoclavable material; and a disposable cartridge removably received in said head of said body to removably receive a dental bit; said disposable cartridge including a hollow cartridge body, a cap which closes said cartridge body, and a turbine; said cap and body cooperating to define a chamber which receives said turbine; said cartridge including an air input opening which is in communication with said air input line to provide operating air to drive said turbine and an exhaust outlet to exhaust said operating air from said chamber; said cartridge body including a base and an wall extending upwardly from said base, said wall defining a surface of said chamber; said base having a diameter, at a widest part, greater than the outer diameter of said wall; said cartridge body wall having an outer diameter slightly smaller than an inner diameter of said head to be frictionally received in said head; said cartridge body base and said cartridge body wall defining a shoulder which abuts a bottom surface of said head.

Claim 24

A high-speed medical/dental handpiece, the handpiece including: a body comprising a sleeve and a head at an end of said sleeve; said sleeve carrying at least an air input tube, said air input tube being operatively connectable to a source of air, said body being made of an autoclavable material; and a disposable cartridge removably received in said head of said body to removably receive a dental bit; said disposable cartridge including a hollow cartridge body, a cap which closes said cartridge body, and a turbine; said cap and body cooperating to define a chamber which receives said turbine; said cartridge including an air input opening which is in communication with said air input line to provide operating air to drive said turbine and an exhaust outlet to exhaust said operating air from said chamber; said cartridge body including a base and an wall extending upwardly from said base, said wall defining a surface of said chamber; said base having a diameter, at a widest part, greater than the outer diameter of said wall; said cartridge body wall having an outer diameter slightly smaller than an inner diameter of said head to be frictionally received in said head; said cartridge body base and said cartridge body wall defining a shoulder which abuts a bottom surface of said head.

Claim 25

The handpiece of claim 22 wherein said cap includes an upper portion and a cylindrical lower portion; said upper portion having a diameter greater than the diameter of said cylindrical lower portion, said upper portion and lower portions defining a shoulder which abuts a top surface of said wall of said cartridge body; said cylindrical lower portion being sized to be frictionally received within said cartridge body.

Claim 26

The handpiece of claim 23 wherein said cartridge cap is fixed to said cartridge body.

Claim 27

The handpiece of claim 23 wherein said cartridge cap and cartridge body are locked together; said cartridge cap including one of a rib and a groove on an outer surface of said lower portion, said cartridge body including the other of the detent and the groove on an inner surface of said cartridge body wall; said detent being received in said groove to snappingly lock said cap and body together.

Claim 28

The handpiece of claim 23 wherein said cartridge body base includes an upper surface defining a floor of said chamber; said floor defining a bore at the center thereof; said bore having a bottom surface defining a hole therethrough; said hole being positioned centrally of said bore; and said cap cylindrical lower portion defines a cartridge cap bore, said cartridge cap bore and said cartridge body bore being axially aligned; and said cartridge including bearings received in said bores; said turbine including an upper boss and a lower boss, said turbine bosses being received in said bearings.

Claim 29

The handpiece of claim 26 wherein said bearings are made of a self-lubricating material.

Claim 30

The handpiece of claim 26 wherein said cartridge includes washers positioned between said turbine and said bearings, said washers vertically positioning said turbine in said cartridge to substantially prevent axial movement of said turbine relative to said cartridge.

Claim 31

The handpiece of claim 26 wherein said turbine has a bore and said bearings have bores aligned with said turbine bore, said bit having a shaft which is extendible through said turbine bore and said bearing bores.

Claim 32

The handpiece of claim 29 wherein said turbine floats between said bearings; said bit shaft being rotatably receivable in said bearings and frictionally receivable in said turbine; said bit shaft defining its axis of rotation.

Claim 33

The handpiece of claim 29 wherein said bearings are self-aligning.

Claim 34

The handpiece of claim 31 wherein said cartridge body bore and said cap bore are defined by curved surfaces and said bearings having arcuate outer surfaces; said bearings being independently pivotal about a vertical axis in said bores, such that the bearing bores may be independently aligned with the turbine bore.

Claim 35

The handpiece of claim 26 wherein said bearings define air flow paths to facilitate cooling of said bearing and said bit.

Claim 36

The handpiece of claim 33 wherein a portion of said air exits said cartridge through said cartridge cap and a portion of said air exits said cartridge about a shaft of said bit, said cartridge cap including air outlets through which a portion of said air that passes though said bearings exit.

Claim 37

The handpiece of claim 33 wherein said bearings include a ring having an outer surface and an inner surface and a plurality of spaced apart radially inwardly extending bosses; said bosses extending above and below said ring and having an outer surface substantially flush with the outer surface of said ring and an inner surface spaced from the inner surface of said ring, the inner surface of said bosses being arcuate, said bosses being of a length sufficient to act as a bearing surface and locator for said bit, said bosses and said inner surface of said ring cooperating to define said air flow paths of said bearing.

Claim 38

A high-speed medical/dental handpiece, the handpiece including: a body comprising a sleeve and a head at an end of said sleeve, said sleeve having a forward end adjacent said head; said sleeve carrying at least an air input tube, said air input tube being operatively connectable to a source of air, said body being made of an autoclavable material; and a disposable cartridge removably received in said head of said body to removably receive a dental bit; said disposable cartridge including a hollow cartridge body, a cap which closes said cartridge body, and a turbine; said cap and body cooperating to define a chamber which receives said turbine; said cartridge including an air input opening which is in communication with said air input line to provide operating air to drive said turbine and an exhaust outlet to exhaust said operating air from said chamber; a optic tube in said sleeve, said optic tube being operably connectable to a source of light and extending through said sleeve to provide light to a workarea in a patient's mouth where the bit is being used; said optic tube being removable from said handpiece; a water supply tube in said sleeve, said cartridge including a bore having an inlet in communication with said water supply tube and an outlet, said water supply tube being operably connectable to a source of water; said cartridge water bore being positioned to direct water to said bit; a manifold received near said forward end of said sleeve; said manifold having a first bore in fluid communication with said air supply tube and positioned to be in communication with said air inlet of said cartridge to place said cartridge chamber in communication with said air supply tube; a second bore in communication with said water supply tube and positioned to be in communication with said bore in said cartridge to place said bore in communication with said water supply tube; a first longitudinally extending channel in communication with said exhaust outlet of said chamber; said sleeve defining an exhaust air flow path; and a second longitudinally extending channel which receives said optic tube; a cutout at said forward end of said sleeve, said cutout being defined by side walls and opening into said handpiece body head; said manifold having a forward surface flush with said forward end of said sleeve; said cartridge including a heel which is received in said cutout; said heel having a back surface substantially adjacent said forward surface of said manifold such that cartridge air inlet, exhaust outlet, and water bore are in fluid communication with said manifold first bore, first opening, and second bore, respectively.

Claim 39

A high-speed medical/dental handpiece, the handpiece including: a body comprising a sleeve and a head at an end of said sleeve, said sleeve having a forward end adjacent said head; said sleeve carrying at least an air input tube, said air input tube being operatively connectable to a source of air, said body being made of an autoclavable material; and a disposable cartridge removably received in said head of said body to removably receive a dental bit; said disposable cartridge including a hollow cartridge body, a cap which closes said cartridge body, and a turbine; said cap and body cooperating to define a chamber which receives said turbine; said cartridge including an air input opening which is in communication with said air input line to provide operating air to drive said turbine and an exhaust outlet to exhaust said operating air from said chamber; a optic tube in said sleeve, said optic tube being operably connectable to a source of light and extending through said sleeve to provide light to a workarea in a patient's mouth where the bit is being used; said optic tube being removable from said handpiece; a water supply tube in said sleeve, said cartridge including a bore having an inlet in communication with said water supply tube and an outlet, said water supply tube being operably connectable to a source of water; said cartridge water bore being positioned to direct water to said bit; a manifold received near said forward end of said sleeve; said manifold having a first bore in fluid communication with said air supply tube and positioned to be in communication with said air inlet of said cartridge to place said cartridge chamber in communication with said air supply tube; a second bore in communication with said water supply tube and positioned to be in communication with said bore in said cartridge to place said bore in communication with said water supply tube; a first longitudinally extending channel in communication with said exhaust outlet of said chamber; said sleeve defining an exhaust air flow path; and a second longitudinally extending channel which receives said optic tube; a cutout at said forward end of said sleeve, said cutout being defined by side walls and opening into said handpiece body head; said manifold having a forward surface flush with said forward end of said sleeve; said cartridge including a heel which is received in said cutout; said heel having a back surface substantially adjacent said forward surface of said manifold such that cartridge air inlet, exhaust outlet, and water bore are in fluid communication with said manifold first bore, first opening, and second bore, respectively.

Claim 40

The handpiece of claim 36 wherein said cartridge water bore extends, at least in part, diagonally downwardly toward a bottom surface of said cartridge.

Claim 41

The handpiece of claim 37 wherein said cartridge bottom surface includes a recess defined by an annular sloped surface, said water bore outlet being at said sloped surface.

Claim 42

The handpiece of claim 36 wherein said heel includes a sloped surface against which at least a part of the light from said optic tube is directed, said sloped surface reflecting light directly at the bit.

Claim 43

A cartridge adapted to be removably received in ahead of a body of a high-speed handpiece of a medical/dental instrument and to receive a bit; said cartridge including: a cartridge body having a base, a wall extending upwardly from said base, and a hole formed centrally of said base through which a dental bit can pass, said base and wall defining an upwardly opening chamber, said chamber having a floor; a cap mounted to the cartridge body to close the chamber; a turbine received in said cartridge body chamber, said turbine including a turbine body having plurality of blades and a bore extending axially through said turbine; and upper and lower bearings received in said chamber; said turbine being positioned between said bearings to float between said bearings in said cartridge when the bit is not received in the cartridge.

Claim 44

A cartridge adapted to be removably received in ahead of a body of a high-speed handpiece of a medical/dental instrument and to receive a bit; said cartridge including: a cartridge body having a base, a wall extending upwardly from said base, and a hole formed centrally of said base through which a dental bit can pass, said base and wall defining an upwardly opening chamber, said chamber having a floor; a cap mounted to the cartridge body to close the chamber; a turbine received in said cartridge body chamber, said turbine including a turbine body having plurality of blades and a bore extending axially through said turbine; and upper and lower bearings received in said chamber; said turbine being positioned between said bearings to float between said bearings in said cartridge when the bit is not received in the cartridge.

Claim 45

The cartridge of claim 40 wherein said cap includes an upper portion and a cylindrical lower portion; said upper portion having a diameter greater than the diameter of said cylindrical lower portion, said cap upper portion and cap lower portion defining a shoulder which abuts said wall of said cartridge body; said cylindrical lower portion diameter being sized to be frictionally received within said cartridge body; said lower portion being sized such that the distance between said cap lower portion and said chamber floor is slightly greater than the height of said turbine blades.

Claim 46

The cartridge of claim 41 including a cartridge body bore formed in said chamber floor and a cartridge cap bore formed in said cap cylindrical lower portion; said cartridge cap bore and said cartridge body bore being axially aligned; said turbine including at least one of an upper boss and a lower boss which is at least partially received in a respective one of said upper and lower bearings.

Claim 47

The cartridge of claim 42 wherein said turbine includes two bosses, said bearings being received in said cap and body bores, said bearings defining bores which receive said turbine bosses.

Claim 48

The cartridge of claim 41 wherein said turbine defines recesses in upper and lower surfaces thereof, said bearings being received in said recesses of said turbine.

Claim 49

The cartridge of claim 42 including washers associated with upper and lower surfaces of said turbine to vertically position said turbine in said cartridge to substantially prevent axial movement of said turbine relative to said cartridge.

Claim 50

The cartridge of claim 42 wherein said bearings have bores aligned with said turbine bore.

Claim 51

The cartridge of claim 46 wherein said bearings are self-aligning.

Claim 52

The cartridge of claim 47 wherein said cartridge body bore and said cap bore are defined by curved surfaces and said bearings have arcuate outer surfaces; said bearings being independently pivotal about a vertical axis in said bores, such that the bearing bores may be independently aligned with the turbine bore.

Claim 53

The cartridge of claim 40 wherein said cartridge body includes a heel; said heel including an air input bore and a water supply bore; said air input bore communicating with said enclosure to supply operating air to said turbine; said cartridge including an air exhaust bore to exhaust operating air from said enclosure; said water bore being formed to direct water to said bit.

Claim 54

The cartridge of claim 49 wherein said cartridge body base includes a bottom surface, said bottom surface defining a counterbored area, said counterbored area being defined by a sloped wall; said water bore having an exit in said sloped wall.

Claim 55

The cartridge of claim 49 wherein at least said cartridge body is made from a light transmitting plastic to form a portion of an optic system.

Claim 56

The cartridge of claim 51 wherein said cartridge body includes a sloped surface against which light is directed by a light source, said sloped surface directing at least some of said light from said light source directly to a work area to provide a spot light effect at said work area.

Claim 57

The cartridge of claim 52 wherein said cartridge body includes a slot formed at least partially in said heel, said sloped surface defining a surface of said slot; said slot extending from a top of said cartridge body, said sloped surface defining at least in part, a bottom of said slot.

Claim 58

The cartridge of claim 53 including a second slot co-linear with said first slot and which extends upwardly from said base of said cartridge body, said second slot having a sloped upper surface.

Claim 59

The cartridge of claim 52 wherein said cartridge body includes a slot formed at least partially in said heel, said sloped surface defining a surface of said slot; said slot extending upwardly from a bottom of said cartridge body, said sloped surface defining a top of said slot.

Claim 60

A high-speed dental/medical handpice, the handpiece including: a body comprising a sleeve and a head at an end of said sleeve; said head defining a chamber; said sleeve carrying an air input tube connectable to a source of air to deliver air to said chamber, a water supply tube connectable to a source of water, and an optic tube connectable to a source of light; and a turbine and independently received in said chamber; wherein said optic tube is removably and independently received in said handpiece to facilitate replacement of said optic tube within said sleeve.

Claim 61

A high-speed dental/medical handpice, the handpiece including: a body comprising a sleeve and a head at an end of said sleeve; said head defining a chamber; said sleeve carrying an air input tube connectable to a source of air to deliver air to said chamber, a water supply tube connectable to a source of water, and an optic tube connectable to a source of light; and a turbine and independently received in said chamber; wherein said optic tube is removably and independently received in said handpiece to facilitate replacement of said optic tube within said sleeve.

Claim 62

The handpiece of claim 56 wherein said handpiece includes a connector at a back end thereof for connecting said handpiece to said sources of light, water, and air; said connector including a bore which slidingly receives said optic tube and a guide tube extending forwardly from said connector bore through at least a part of said sleeve, said optic tube slidingly extending through said connector bore and said guide tube.

Claim 63

The handpiece of claim 56 wherein a portion of said head is made of light transmitting material, said optic tube extending though said sleeve to abut said portion of said head, said portion of said head being formed to direct light toward a workarea.

Claim 64

The handpiece of claim 58 wherein said head of said handpiece includes said head of said body and a disposable cartridge; said disposable cartridge being removably and frictionally received in said body head; said cartridge including a cartridge body; said light transmitting portion of said head comprising said cartridge body.

Claim 67

In a high speed medical/dental handpiece including: a body comprising a sleeve and a head at an end of said sleeve; said head defining a chamber, a turbine rotatably received in said chamber, an opening in a bottom of said head to allow for a dental bit to be inserted into said chamber, an air supply tube extending through said sleeve and being connectable to a source of air to deliver air to said chamber to rotatably drive said turbine, a water supply tube extending through said sleeve and being operably connectable to a supply of water to direct water towards the bit driven by said turbine, and an optic system for delivering light to a workarea; the improvement comprising: said optic system, said optic system delivering said light from said head bottom surface, the light delivered from said head bottom surface surrounding said opening in said head bottom surface.

Claim 68

In a high speed medical/dental handpiece including: a body comprising a sleeve and a head at an end of said sleeve; said head defining a chamber, a turbine rotatably received in said chamber, an opening in a bottom of said head to allow for a dental bit to be inserted into said chamber, an air supply tube extending through said sleeve and being connectable to a source of air to deliver air to said chamber to rotatably drive said turbine, a water supply tube extending through said sleeve and being operably connectable to a supply of water to direct water towards the bit driven by said turbine, and an optic system for delivering light to a workarea; the improvement comprising: said optic system, said optic system delivering said light from said head bottom surface, the light delivered from said head bottom surface surrounding said opening in said head bottom surface.

Claim 69

The improvement of claim 61 wherein at least a portion of said head is made of light transmitting material; said optic system including an optic tube extending through said sleeve and being in abutting relationship with said light transmitting portion of said head, said bottom surface of said head being made of said light transmitting material.

Claim 70

The improvement of claim 62 wherein said water supply tube defines at least a part of a water supply path, said head having a bottom surface, said water supply path having an exit in said head bottom surface; said bottom surface including a countersunk area defined by a sloping annular wall concentric with said bit; said water path exit being formed in said annular wall to direct said water at said bit.

Claim 71

The improvement of claim 62 wherein said at least a portion of said head made from light transmitting material includes a sloped surface against which at least a part of the light from said optic tube is directed, said sloped surface reflecting light directly at the bit.

Claim 72

The improvement of claim 64 wherein said at least a portion of said head includes a slot, said sloped surface defining a surface of said slot.

Claim 73

The improvement of claim 65 wherein said slot extends upwardly from a bottom of said head, said sloped surface defining an upper surface of said slot.

Claim 74

The improvement of claim 61 wherein said head includes a pair of bearings; the improvement further including said turbine floating between said bearings; said bearings and said turbine receiving a shaft of a bit such that the bit shaft defines an axis of rotation for said turbine and said bit.

Claim 75

The improvement of claim 61 wherein said turbine includes a turbine body and turbine blades extending from said body, said turbine blades defining an airfoil and including a leading surface and a generally planar trailing surface.

Claim 76

The improvement of claim 68 wherein said leading surface of said turbine blade includes a generally planar section and an arcuate section, said arcuate section being defined by a radius, wherein the ratio of the length of said trailing surface to said radius is about 6.

Claim 77

The improvement of claim 68 wherein said turbine blade is spaced from said turbine body, said turbine including a buttress which connects said turbine blade to said turbine body.

Claim 78

The improvement of claim 61 wherein said head includes a pair of bearings between which said turbine is positioned, aid bearings defining air flow paths to facilitate cooling of said bearing and said bit.

Claim 79

The improvement of claim 71 wherein a portion of said air exits said cartridge through said cartridge cap and a portion of said air exits said cartridge about a shaft of said bit, said cartridge cap including air outlets through which a portion of said air that passes though said bearings exit.

Claim 80

The improvement of claim 71 wherein said bearings include a ring having an outer surface and an inner surface and a plurality of spaced apart radially inwardly extending bosses; said bosses extending above and below said ring and having an outer surface substantially flush with the outer surface of said ring and an inner surface spaced from the inner surface of said ring, the inner surface of said bosses being arcuate, said bosses being of a length sufficient to locate a shaft of said bit, said bosses and said inner surface of said ring cooperating to define said air flow paths of said bearing.

Claim 81

A high-speed medical/dental handpiece including a body comprising a sleeve and a head at an end of said sleeve; said head defining a chamber having a floor, a turbine rotatably received in said chamber, an opening in said chamber floor to allow for a bit to be inserted into said chamber, upper and lower bearings in said chamber; and a turbine received in said chamber; said bit having a shaft, said bit shaft being passed through said lower bearing, said turbine, and at least partially into said upper bearing; said bit shaft rotatably supporting said turbine between said bearings.

Claim 82

A high-speed medical/dental handpiece including a body comprising a sleeve and a head at an end of said sleeve; said head defining a chamber having a floor, a turbine rotatably received in said chamber, an opening in said chamber floor to allow for a bit to be inserted into said chamber, upper and lower bearings in said chamber; and a turbine received in said chamber; said bit having a shaft, said bit shaft being passed through said lower bearing, said turbine, and at least partially into said upper bearing; said bit shaft rotatably supporting said turbine between said bearings.

Claim 83

The handpiece of claim 74 wherein said turbine floats axially and/or laterally in said chamber when said bit shaft is not received in said chamber.

Claim 84

The handpiece of claim 74 wherein said bit shaft defines an axis of rotation for said bit and for said turbine.

Claim 85

A high speed dental/medical handpiece including a body comprising a sleeve and a head at an end of said sleeve; said head receiving a bit; said head including an optic system, said optic system including a prism on a lower surface of said head to focus light towards said bit.

Claim 86

A high speed dental/medical handpiece including a body comprising a sleeve and a head at an end of said sleeve; said head receiving a bit; said head including an optic system, said optic system including a prism on a lower surface of said head to focus light towards said bit.

Claim 87

The handpiece of claim 77 wherein a bottom portion of said handpiece head is made of a light transmitting material, said prism being formed in said light transmitting portion of said handpiece.

Claim 88

The handpiece of claim 78 wherein said handpiece includes a disposable cartridge, said cartridge comprising a portion of said handpiece head; said disposable cartridge including said light transmitting material.

Claim 89

A high-speed medical/dental handpiece operable at speeds in excess of 50,000 rpm, said handpiece including a body comprising a sleeve and a head at an end of said sleeve; said head defining a chamber having a floor, a turbine rotatably received in said chamber, an upper bearing above said turbine and a lower bearing below said turbine, said upper and lower bearings being plastic sleeve bearings.

Claim 90

A high-speed medical/dental handpiece operable at speeds in excess of 50,000 rpm, said handpiece including a body comprising a sleeve and a head at an end of said sleeve; said head defining a chamber having a floor, a turbine rotatably received in said chamber, an upper bearing above said turbine and a lower bearing below said turbine, said upper and lower bearings being plastic sleeve bearings.

Claim 91

The high-speed handpiece of claim 80 wherein the plastic sleeve bearings are made from a high-heat plastic.

Claim 92

The high-speed handpiece of claim 81 wherein the plastic sleeve bearings are made from a self-lubricating plastic.

Claim 93

The high-speed handpiece of claim 81 wherein the plastic sleeve bearings are made from a phenolic resin.