US20160206327A1 - Surgical handpiece with a drive spindle having a distal bore to which locking elements are mounted and an adjacent proximal bore defined by faces shaped to transfer torque to the attached cutting accessory - Google Patents
Surgical handpiece with a drive spindle having a distal bore to which locking elements are mounted and an adjacent proximal bore defined by faces shaped to transfer torque to the attached cutting accessory Download PDFInfo
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- US20160206327A1 US20160206327A1 US14/947,465 US201514947465A US2016206327A1 US 20160206327 A1 US20160206327 A1 US 20160206327A1 US 201514947465 A US201514947465 A US 201514947465A US 2016206327 A1 US2016206327 A1 US 2016206327A1
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- spindle
- bore
- distal
- proximal
- surgical tool
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/16—Bone cutting, breaking or removal means other than saws, e.g. Osteoclasts; Drills or chisels for bones; Trepans
- A61B17/1613—Component parts
- A61B17/162—Chucks or tool parts which are to be held in a chuck
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/16—Bone cutting, breaking or removal means other than saws, e.g. Osteoclasts; Drills or chisels for bones; Trepans
- A61B17/1613—Component parts
- A61B17/1615—Drill bits, i.e. rotating tools extending from a handpiece to contact the worked material
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/16—Bone cutting, breaking or removal means other than saws, e.g. Osteoclasts; Drills or chisels for bones; Trepans
- A61B17/1613—Component parts
- A61B17/1622—Drill handpieces
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/16—Bone cutting, breaking or removal means other than saws, e.g. Osteoclasts; Drills or chisels for bones; Trepans
- A61B17/1613—Component parts
- A61B17/1622—Drill handpieces
- A61B17/1624—Drive mechanisms therefor
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/16—Bone cutting, breaking or removal means other than saws, e.g. Osteoclasts; Drills or chisels for bones; Trepans
- A61B17/1613—Component parts
- A61B17/1628—Motors; Power supplies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
- B23B31/02—Chucks
- B23B31/10—Chucks characterised by the retaining or gripping devices or their immediate operating means
- B23B31/107—Retention by laterally-acting detents, e.g. pins, screws, wedges; Retention by loose elements, e.g. balls
- B23B31/10741—Retention by substantially radially oriented pins
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B45/00—Hand-held or like portable drilling machines, e.g. drill guns; Equipment therefor
- B23B45/008—Gear boxes, clutches, bearings, feeding mechanisms or like equipment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
- B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
- B25F5/001—Gearings, speed selectors, clutches or the like specially adapted for rotary tools
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/16—Bone cutting, breaking or removal means other than saws, e.g. Osteoclasts; Drills or chisels for bones; Trepans
- A61B17/1613—Component parts
- A61B17/1631—Special drive shafts, e.g. flexible shafts
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/32—Surgical cutting instruments
- A61B17/320016—Endoscopic cutting instruments, e.g. arthroscopes, resectoscopes
- A61B17/32002—Endoscopic cutting instruments, e.g. arthroscopes, resectoscopes with continuously rotating, oscillating or reciprocating cutting instruments
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B2017/0046—Surgical instruments, devices or methods, e.g. tourniquets with a releasable handle; with handle and operating part separable
- A61B2017/00464—Surgical instruments, devices or methods, e.g. tourniquets with a releasable handle; with handle and operating part separable for use with different instruments
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B2017/00477—Coupling
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B2017/00681—Aspects not otherwise provided for
- A61B2017/00734—Aspects not otherwise provided for battery operated
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/32—Surgical cutting instruments
- A61B17/320016—Endoscopic cutting instruments, e.g. arthroscopes, resectoscopes
- A61B17/32002—Endoscopic cutting instruments, e.g. arthroscopes, resectoscopes with continuously rotating, oscillating or reciprocating cutting instruments
- A61B2017/320032—Details of the rotating or oscillating shaft, e.g. using a flexible shaft
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T279/00—Chucks or sockets
- Y10T279/34—Accessory or component
- Y10T279/3406—Adapter
- Y10T279/3418—Adapter for particular tool or workpiece
Landscapes
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Surgery (AREA)
- Engineering & Computer Science (AREA)
- Oral & Maxillofacial Surgery (AREA)
- General Health & Medical Sciences (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Dentistry (AREA)
- Veterinary Medicine (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Medical Informatics (AREA)
- Molecular Biology (AREA)
- Animal Behavior & Ethology (AREA)
- Orthopedic Medicine & Surgery (AREA)
- Public Health (AREA)
- Mechanical Engineering (AREA)
- Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
- Surgical Instruments (AREA)
Abstract
A surgical handpiece with a rotating spindle for receiving the coupling head of a cutting accessory. The spindle has a proximal bore with faces shaped to transfer torque to the cutting accessory. A distal bore extends forward from and the proximal bore to the distal end of the spindle. The distal bore is shaped so the outer perimeter of the bore is located radially outwardly from the proximal bore. One or more openings are formed in the spindle open into the distal bore. The openings are forward of the proximal end of the distal bore. A locking member is able to move in and out of each opening so as to move in and out of the distal bore. The locking members, when seated in the distal bore releasable hold the cutting accessory seated in the distal and proximal bores to the spindle.
Description
- This application claims priority from U.S. patent application Ser. No. 13/795,064 filed 12 Mar. 2013, now U.S. Pat. No. 9,192,394. U.S. patent application Ser. No. 13/795,064 claims priority from U.S. patent application Ser. No. 11/471,266 filed 20 Jun. 2006, now U.S. Pat. No. 8,419,760. U.S. patent application Ser. No. 11/471,266 claims priority under 35 U.S.C. Sec. 119 from U.S. Provisional Pat. App. No. 60/693,638 filed 25 Jun. 2005. The above-identified priority applications are incorporated herein by reference.
- This invention relates to a surgical handpiece able to accept different rotating attachments and cutting accessories. More particularly, this invention is related to a surgical handpiece with a clutch for transferring rotational moment from a drive assembly that is compact in size. This invention is further related to a surgical handpiece with a coupling head for receiving different attachments or accessories that minimizes attachment/accessory rotational wobble.
- In modern surgery, an important instrument available to medical personnel is the powered surgical tool. Often, this tool is a handpiece in which a motor is housed. Secured to the handpiece is a cutting accessory designed for application to a surgical site on a patient in order to accomplish a specific medical task. Some powered surgical handpieces are provided with drills or reamers for cutting bores or other void spaces in tissue. The ability to use powered surgical tools on a patient lessens the physical strain of surgeons and other medical personnel when performing procedures on a patient. Moreover, most surgical procedures can be performed more quickly, and more accurately, with powered surgical tools than with the manual equivalents that preceded them.
- One such type of tool is the surgical rotary handpiece. A rotary handpiece has spindle that rotates in response to actuation of the handpiece motor. Attached to the front end of the spindle is a coupling assembly. The coupling assembly releasably holds a device to the spindle so that the device rotates in unison with the spindle. Generally, two types of devices are releasably coupled to a handpiece spindle. One type of device is the actual cutting accessory, for example, the drill or the reamer. The cutting accessory has a shaft. The proximal end, the rear end, of the shaft is releasably held to the spindle by the coupling head.
- The second type of device coupled to a rotary handpiece is a front end attachment. The attachment has a housing with opposed front and rear ends. An input shaft extends from the attachment rear end. The attachment front end has its own output spindle and complementary coupling assembly. Sometimes a gear assembly is located between the input shaft and the output spindle of an attachment. The gear assembly contains gears that typically increase the torque/decrease the speed of the rotational motion applied to the attached cutting accessory through the attachment output spindle. When the attachment is attached to the handpiece, the attachment housing is often statically coupled to the handpiece housing. The handpiece coupling assembly holds the attachment input shaft to the handpiece spindle. The actual cutting accessory is locked to the attachment spindle. The attachment speed reduces or speed increases the rotational moment output by the handpiece that is applied to the cutting accessory. Typically an attachment is used to speed reduce/torque increase the rotational moment of the attached cutting accessory.
- Other attachments provide a means to attaching a cutting accessory to the handpiece spindle so the two components rotate at the same speed. An attachment of this variety typically does not have a gear assembly.
- It is known to provide surgical handpieces with internal torque increasing/speed reducing gear assemblies. Some of these assemblies have plural output heads. This gear assembly receives the rotational moment from the motor output shaft and simultaneously rotates the plural output heads at different speeds. A clutch selectively connects the drill output spindle for rotation to one of the gear assembly output heads. The output speed/torque producing capability of the handpiece spindle is set by setting the clutch to selectively set the gear assembly-to-drill spindle connection. In some circumstances, these assemblies eliminate the need to employ a front head torque increasing/speed reducing attachment.
- Known handpiece gear and clutch assemblies are relatively long in length. A disadvantage of this type of structure is that it increases the overall length of the handpiece. This runs contrary to a goal of efficient handpiece design, namely, the handpiece should be made as short as possible. This is because it easier for a surgeon to accurately position the working end of the cutting accessory that is relatively close to his/her hand than one further away. To provide this feature it is, therefore, desirable to construct a handpiece that has an overall length, especially from the motor forward, that is as compact as possible.
- Moreover, a surgical handpiece is typically designed to be held at or near its center of gravity. This design reduces the physical stress to which the surgeon is exposed when he/she holds and needs to precisely position the tool in order to accomplish a given surgical procedure. The positioning of any mass away from a surgical handpiece's center of gravity/hand hold makes it more difficult for the surgeon to hold and precisely position the handpiece. Known gear and clutch assemblies, because of their lengths and masses, are typically off center from the center of gravity of the handpieces with which they are integral. During a surgical procedure, it may be necessary for the surgeon to precisely control a tool's position for an extended period. The off-center mass of a gear and clutch assembly can add to the physical stress to which the surgeon is exposed when so holding the tool.
- Other disadvantages are associated with known coupling assemblies used to releasably hold cutting accessories and attachments to the handpiece spindles. Known coupling assemblies are effective for transmitting torque, rotational moment, from a handpiece spindle to the attached accessory/attachment and hold the accessory/attachment firmly to the spindle. Nevertheless, many coupling assemblies allow that shaft of the attached accessory/attachment to radially shift position, relative to the axis of the associated handpiece spindle.
- The looseness of this fit allows the accessory/attachment to wobble when coupled to the handpiece. Wobble present in the shaft adjacent the surgical handpiece is amplified at the distal free end of the attachment, the end applied to the surgical site. Some attachments, for example reamers and drills used to perform certain procedures have lengths of 10 cm or more. The wobble, the radial shifting, at the distal end of these attachments can therefore be quite significant. The presence of this movement can appreciably add to the overall control the surgeon must exert in order to ensure that the working end of the attachment remains accurately position at the surgical site to which the attachment is applied.
- This invention is related to a new and useful surgical rotary handpiece. The handpiece of this invention has both a clutch assembly that is compact in length and a coupling assembly that limits the wobble of the shaft of the complementary accessory/attachment fitted to the handpiece.
- The clutch of the surgical rotary handpiece of this invention has moveable pins that selectively connect one of a plurality of the gear assembly drive heads to the handpiece output spindle for simultaneous rotation. A shifter positions the movable pins. A shift ring displaces the shifter. The moveable pins and members that transfer the motion from the shift ring to the shifter overlap. Collectively, these features combine to form a clutch of short axial length.
- The coupling assembly of the handpiece of this invention is partially integral with the handpiece spindle. Internal to the spindle is a bore in which a coupling head of the attachment/accessory shaft is seated. The most proximal end of the surfaces of the spindle that define the bore and the most distal end of the coupling head are formed with complementary geometric features that force the transfer of torque, rotation movement, from the spindle to the shaft.
- Extending forward, the coupling head is formed with a stabilizing body. This spindle bore is shaped so that the body is tightly fitted in the adjacent section of the bore. In some preferred versions of the invention, the stabilizing body and complementary bore-defining shaft inner wall have circular cross sectional profiles. Owing to the tight fit of the shaft in the bore, wobble of the shaft is minimized.
- The accessory/attachment stabilizing body is formed with an indentation. In one version of the invention, this indentation is an annular groove that extends around the stabilizing body. The coupling assembly has retractable pins that extend into the spindle bore. The pins seat in the complementary stabilizing body indentation to releasably lock the accessory/attachment to the housing spindle.
- The invention is pointed out with particularity in the claims. The above and further features of this invention may be better understood by reference to the following detailed description taken in conjunction with the accompanying drawings in which:
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FIG. 1 is a side view of a surgical rotary handpiece of this invention to which a surgical accessory of this invention is attached; -
FIG. 2 is a cross sectional view of the front end of the handpiece along the longitudinal axis; -
FIG. 2A is an enlarged cross sectional view of the distal end of the handpiece ofFIG. 2 ; -
FIG. 3 is an exploded view of the distal front end of the handpiece; -
FIG. 4 is an exploded view of the gear train of the surgical handpiece of this invention; -
FIG. 5 is a cross sectional view of the gear train; -
FIG. 6 is a plan view of the spindle of the surgical handpiece of this invention; -
FIG. 7 is a cross sectional view of the spindle taken along line 7-7 ofFIG. 6 ; -
FIG. 8 is a perspective view of the output coupler; -
FIG. 9 is a cross sectional view of the output coupler; -
FIG. 10 is an end view of a rotary housing of the surgical handpiece of this invention; -
FIG. 11 is a plan view of the rotary housing; -
FIG. 12 is a cross section view of the rotary housing taken along line 12-12 ofFIG. 11 ; -
FIG. 13 is an exploded view of the components forming the clutch; -
FIG. 14 is a perspective view of the inner shifter of the clutch of this invention; -
FIG. 15 is a cross sectional view of the inner shifter; -
FIG. 16 is a perspective view of the shifter housing; -
FIG. 17 is a cross sectional view of the shifter housing; -
FIG. 18 is a perspective view of the shift ring; -
FIG. 19 is a cross sectional view of the shift ring; -
FIG. 20 is a perspective view of the shift ring nut; -
FIG. 21 is a cross sectional view of the shift ring nut; -
FIG. 22 is an exploded view of the coupling assembly; -
FIG. 23 is a side view of the coupling assembly actuating ring; -
FIG. 24 is a cross sectional view of the actuating ring; -
FIG. 25 is a perspective view of the actuating sleeve; -
FIG. 26 is a cross sectional view of the actuating sleeve; -
FIG. 27 is a plan view of a cutting accessory with the coupling head of this invention; -
FIG. 27A is a perspective view of the coupling head of the cutting accessory; -
FIG. 28 depicts how a coupling assembly pin seats in a groove of the coupling head according to this invention; -
FIG. 29 is a lateral cross section view illustrating how the coupling assembly pins seat in the coupling head indentation; -
FIG. 30 is a cross sectional view illustrating the position of the coupling assembly when in the load state; -
FIG. 31 is a lateral cross section view illustrating the position of the coupling assembly pins when in the load state; -
FIG. 32 is a plan view of an attachment with the coupling head of this invention; -
FIG. 33 is an exploded view of a section of an alternative clutch assembly of this invention; and -
FIG. 34 is a cross sectional view of a portion of the assembly ofFIG. 33 . -
FIGS. 1 and 2 illustrate a rotarysurgical handpiece 20 constructed in accordance with the invention.Handpiece 20 has ahousing 22 in which in amotor 24 is seated. In one version of thehandpiece 20,motor 24 is a DC motor. In other versions of the invention,motor 24 may be an AC motor, or a pneumatic or hydraulically driven motor. Integral with themotor 24 is rotatingoutput shaft 26.Handpiece housing 22 is shaped to have a generallycylindrical head 28 in which motor 24 is fitted. Extending downwardly fromhead 28,handpiece housing 22 is shaped to have ahandle 30 generally in the form of a pistol grip. - At least one
trigger switch 32 extends distally forward from the front face ofhandle 30. (“Distal”, it shall be understood means toward the surgical site to which thehandpiece 20 is directed. “Proximal”, means away from the surgical site.) A control circuit internal to thehousing 22, (not illustrated and not part of this invention) monitors the actuation of thetrigger switch 32. Based on the extent to which thetrigger switch 32 is actuated, the control circuit selectively energizes themotor 24 to cause the output shaft to rotate at the desired speed. - A
gear train 36 is connected to the exposed distally located front end of themotor shaft 26.Gear train 36 includes gears that reduce the speed and increase the torque of the rotational moment output byshaft 26. Thegear train 36 has two rotating drive heads 86 and 92 (FIG. 4 ). Owing to the arrangement of the gears forminggear train 36, the rotation ofmotor shaft 26 causes driveheads Gear train 36 thus functions as a speed reduction assembly that outputs rotational force at two separate speeds. - With reference to
FIGS. 2, 2A and 3 it can be seen that aspindle 42 is rotatably mounted to thehousing head 28 forward ofgear train 36. A clutch 44 selectively connects one of the two gear train drive heads 86 or 92 to spindle 42 so that the spindle and connected drive head rotate in unison. - A
coupling assembly 46 releasably holds a surgical attachment or a surgical cuttingaccessory 48, seen inFIG. 27 to thespindle 42. The particular cuttingaccessory 48 is an acetabular reamer. Again, it should be appreciated that this is exemplary, not limiting. Cuttingaccessory 48 has a distal endtissue working head 50, in the example, an acetabular reamer head. Extending proximally fromtissue working head 50, cuttingaccessory 48 has an elongatedshaft 52. Acoupling head 54 is attached to the proximal end ofshaft 52. Couplinghead 54 is formed with geometric features that facilitate the rotational coupling of cuttingaccessory 48 to spindle 42 and minimize wobble of the accessory relative to thehandpiece 30. -
Surgical handpiece 20 of this invention is constructed so that the distal end ofspindle 42 is formed with a bore 120 (FIG. 7 ) for receiving the attachment/accessory coupling head 54. Couplingassembly 46 locks theaccessory coupling head 54 inspindle bore 120. As a consequence of this engagement, thecoupling head 54, and therefore the whole of cuttingaccessory 48, rotates in unison with thespindle 42. -
Gear train 36, now described by reference toFIGS. 3-5 , includes a first set of three (3) planet gears 62 (two shown). Planet gears 62 are each rotatably mounted to a generally disc shapedplanet carrier 64. Planet gears 62 andplanet carrier 64, as with the remaining planet gears and planet carriers ofgear train 36 are housed in a generally tubularly shapedring gear 66.Ring gear 66 has a smoothed shaped outer wall and a toothed inner wall, (teeth not illustrated). The teeth of planet gears 62, as well as the teeth of the remaining planet gears 74 and 82, engage the teeth ofring gear 66. -
Ring gear 66 is statically mounted in thehandpiece housing head 28 forward ofmotor 24. To facilitate the static mounting ofring gear 66, the ring gear is formed with two proximally extendingfeet 68. The feet seat in openings formed in an internalstructural web 70 of the housing to block rotation of the ring gear (openings not identified). - Planet gears 62 seat over and engage a
gear pinion 71 disposed over motor shaft 26 (identified inFIG. 2 ). Thus, the rotation ofmotor shaft 26 results in the rotation of planet gears 62 andplanet carrier 64. - A
first sun gear 72 is integrally mounted to, concentric with and extends distally forward fromplanet carrier 64.Sun gear 72 engages a second set of three (3) planet gears 74 (two shown). Planet gears 74 are rotatably disposed around asecond planet carrier 76. Atubular post 78 is integrally attached, concentric with and extends distally forward fromsecond planet carrier 76. A set of teeth disposed around the proximal end base ofpost 78 form asecond sun gear 80. -
Second sun gear 80 engages a third set of planet gears, four (4) planet gears 82 (one shown). Planet gears 82 are rotatably attached to and disposed around athird planet carrier 84. Afirst drive head 86 is formed integrally with and extends axially forward from the third planet carrier. Thefirst drive head 86 has a generally circular outer profile. The outer surface ofdrive head 86 is further shaped to have a plurality of longitudinally extending inwardly concaved,notches 88. Thenotches 88, which are circumferentially spaced apart, are located around the whole of the circumference ofdrive head 86.Planet carrier 84 is further formed to have an axially extending throughbore 90.Bore 90 extends completely through both theplanet carrier 84 and drivehead 86. - A second drive head,
drive head 92, is positioned distally forward of and is concentric withdrive head 86. Drivehead 92 has the same outer diameter asdrive head 86. Drivehead 92 is further shaped tonotches 94 that have the same profile ofnotches 88 of thefirst drive head 86. A tubularly shapedstem 96 extends proximally rearward fromdrive head 92. In many versions of the invention,second drive head 92 and stem 96 are integrally formed. Whengear train 36 is assembled, post 78 of thesecond planet carrier 76 is disposed inbore 90 ofthird planet carrier 84 and drivehead 86.Stem 96 similarly is disposed inbore 90. More particularly, stem 96 is dimensioned to be tightly press fit overpost 78. Thus,drive head 92 rotates in unison with thesecond planet carrier 76. Collectively, post 78 and stem 96 are shaped so that there is a longitudinal separation between drive heads 86 and 92. - Drive
head 86 and stem 96 are further collectively shaped so that the outer surface of the stem is spaced inwardly of theadjacent bore 90 defining inner wall of the drive head. This arrangement allowsstem 96 to rotate freely relative to thedrive head 88. Adjacent the proximal end ofstem 96, a bearingassembly 97 extends betweenpost 78 and an adjacent inner circular wall internal toplanet carrier 84. More particularly, the planet carrier internal wall against which the outer race of bearingassembly 97 seats defines anelongated groove 99 that is concentric with and has a large outer diameter than planet carrier bore 90. A retainingring 100 disposed proximal to the bearingassembly 97 holds the bearing assembly in position. Retainingring 100 is snap fitted in agroove 101 also formed in the interior ofplanet carrier 84. Theplanet carrier 84 is formed so thatgroove 101 is between the proximal end opening ofbore 90 andgroove 99 and is of greater diameter thangroove 99. - Drive
head 92 has anose 91.Nose 91 extends forward of the portion of the drive head formed withnotches 94. An O-ring 89 is disposed overnose 91. O-ring 89 is fitted over thedrive head nose 91 portion immediately distal to the portion of the nose that definesnotches 94. - A bearing
assembly 95 rotatably holdsplanet carrier 84 to thestatic ring gear 66. Bearingassembly 95 has an outer race (not illustrated) seated in the perimeter of acounterbore 67 that forms the open end ofring gear 66. The inner race of bearing assembly 95 (not illustrated) seats against anannular step 98 formed in the outer perimeter of thethird planet carrier 84. A retainingring 87 holds bearingassembly 95 and, by extension, the moving components ofgear train 36, inring gear 66. Retainingring 87 is snap fitted in agroove 93 formed in the inner wall of thering gear 66 that definescounterbore 67. - The structure of the
spindle 42 is now described by reference toFIGS. 6 and 7 . Generally,spindle 42 is formed from a single piece of metal that has circular sections of different diameters. At the most proximal end,spindle 42 has ahead 102.Spindle 42 is further formed so that, internal to head 102 is abore 104 with a hexagonal cross-sectional profile. The specific cross-section profile ofbore 104 is not relevant to the basic structure of this invention. What is relevant is thatbore 104 is shaped to closely slip fit receive the proximal end of the cuttingaccessory coupling head 54 fitted to the cuttingaccessory 48. The close fitting is required because the inner surfaces of thespindle 42, face surfaces 105, that definebore 104 are the surfaces that transmit the torque to the cuttingaccessory 48. - Extending distally from
head 102,spindle 42 has acollar 106.Collar 106 is shaped to have an outer diameter greater than that ofhead 102. Immediately forward, proximal, of the distal end of thecollar 106, the collar is shaped to have agroove 108 that extends circumferentially around the outer surface of the collar.Collar 106 is further formed to define anopening 110 that extends laterally through the collar.Opening 110 is located to extend through an arcuate section of thecollar 106 that defines the base ofgroove 108.Opening 110 extends from a base of arecess 111 cut into the outer surface ofcollar 106. -
Spindle 42 is further formed to have astem 112 that projects distally forward fromcollar 106.Stem 112 has a number of sections with different outer diameters. Aproximal section 113adjacent collar 106 has a diameter approximately equal to that ofsleeve head 102.Stem section 113 is formed to have two diametrically opposed receivingslots 114. Each receivingslot 114 is in a plane that, relative to the longitudinal axis ofspindle 42, extends diagonally forward. In some versions of the invention, eachslot 114 is in a plane that, relative to the longitudinal axis of thespindle 42, is at an angle of approximately 45°. Thus, as seen inFIG. 6 , when viewing aslot 114 from the front, aslot 114 appears to have a curved profile. - Forward of
section 113, thestem 112 is further formed to have acircumferential groove 116. Forward ofgroove 116stem 112 has anintermediate section 115.Section 115 has a diameter slightly less than that ofproximal section 113. The reduced diameter ofstem section 115 allows below discussed wave spring 177 (FIG. 22 ) to freely flex. - Forward of
section 115, spindle stem 112 is formed with adistal end section 117.Stem section 117 has an outer diameter between the diameters ofsections FIG. 2A ) tightly fits overstem section 117. Agroove 118 extends circumferentially around the outer surface ofstem 112.Groove 118 is located immediately proximal to the distal end ofstem section 117, which is also the distal end ofspindle 42. -
Spindle 42 is further formed to have abore 120 that extends from the distal end, throughstem 112 andcollar 106 to bore 104.Bore 120 is concentric and contiguous withbore 104. In preferred versions of the invention, bore 120 has a circular cross sectional profile, though that need not always be the case.Bore 120 is dimensioned to facilitate the close slip fitting of acoupling head 54 of the cuttingaccessory 48 as discussed below. - A
pin 121, seen inFIG. 13 , is fitted inspindle opening 110 so as to be directed to the longitudinal center axis of thespindle 42.Pin 121 extends intobore 120 - A generally tubular shaped
outer coupler 124 is tightly fitted to thespindle 42, now described by reference toFIGS. 8 and 9 .Outer coupler 124 has a constant outer diameter. Theouter coupler 124 is further formed to have a proximal end bore 126 that extends distally forward from the proximal end of the coupler. In one version of the invention, proximal end bore 126 extends approximately half way through the length of the coupler.Output coupler 124 also has a distal end bore 128 that extends rearward from the distal end of the coupler. Distal end bore 128 has a diameter that facilitates the compression fitting ofsleeve head 102 in thebore 128. - Between the proximal end and distal end bores 126 and 128, respectively,
output coupler 124 is formed to have a circularvoid space 127. The outer perimeter ofvoid space 127 is defined by acircular flange 129 that extends inwardly from the inner walls ofcoupler 124 that define bores 126 and 128 andspace 127. The distally-directed laterally extend annular face offlange 129 is the surface against which the proximally directed face ofsleeve head 102 abuts.Outer coupler 124 is further formed to have four longitudinally extendingslots 134. Eachslot 134 extends from the outer surface of thecoupler 124 into the proximal end bore 126.Slots 134 are equangularly spaced apart from each other around the perimeter of theouter coupler 124. -
Outer coupler 124 itself is shaped to have an outer diameter that is slightly greater than the outer diameter ofspindle collar 106. When thespindle head 102 is fit in theouter coupler 124, the distal end face of the outer coupler forms an annular step around the proximal end of thespindle collar 106. - Returning to
FIG. 2 , it can be seen that, whensurgical handpiece 20 of this invention is assembled, thespindle 42 andouter coupler 124 sub-assembly are fitted in thehousing 32 so that gear train drive heads 86 and 92 are disposed in the proximal end bore 126 of the outer coupler.Outer coupler 124 is shaped so that the inner wall that defines the proximal end bore 126 is spaced away from the drive heads 86 and 92.Drive head nose 91 seats in outer couplervoid space 127. O-ring 93 abuts the adjacent inner face ofcoupler flange 129. -
Gear train 36,outer coupler 124 andspindle 42 are substantially disposed in arotary housing 130 that extends distally forward from the front ofhandpiece housing 22. Therotary housing 130, now described by reference toFIGS. 10-12 , is formed from a single piece of metal that has a number of circular cross-sectional sections. The most proximal section of therotary housing 130 is abase 132. The outer surface ofrotary section base 132 adjacent the proximal end of the rotary section is formed with threading 137 (seen inFIG. 11 only).Base 132 is formed with an open endedbore 136.Bore 136 is dimensioned to facilitate the loose slip fitting of the base over geartrain ring gear 66. When handpiece 20 is assembled, base threading 137 engagescomplementary threading 138 formed around an inner wall of housing 28 (FIG. 2 ). This threaded engagement holdsrotary housing 130 to thehandpiece housing 22. - Extending distally of the threaded section,
rotary housing base 132 is formed with asection 140 with a smooth outer wall. Forward ofbase section 140, therotary housing 130 has aflange 142 that extends radially outward ofbase 132.Flange 142 is the structural component of therotary housing 130 that stops proximal movement of the rotary housing when the housing is screw fitted to thehandpiece housing 22.Rotary housing 130 is further formed to define fourslots 144 that extend throughbase section 140 andflange 142.Slots 144 are equangularly spaced apart. Theslots 144 function as spaces for receiving a fastening tool (not illustrated) used to screw secure therotary housing 130 to thehandpiece housing 22 during manufacture. - Forward of
flange 142,rotary housing 130 forms aclutch sleeve 146.Clutch sleeve 146 has a diameter slightly less than that ofbase 132. Theclutch sleeve 146 is formed to have four equangularly spaced apartslots 148.Slots 148 extend diagonally downwardly around the outer circumference of theclutch sleeve 146. Four equangularly spaced apart holes 150 are also formed in theclutch sleeve 146.Holes 150 are in a common circumferential section of the clutch sleeve located proximal to the proximal ends ofslots 148.Holes 150 are provided to facilitate manufacture and disassembly of thehandpiece 20. - A
groove 152 is formed in theclutch sleeve 146 to extend circumferentially around the outer surface of the sleeve.Groove 152 is located proximally rearward of the forward distal end of theclutch sleeve 146. The outer surface of theclutch sleeve 146 located distal to groove 152 and extending to the distal end of the clutch sleeve is provided with threading 154 (seen inFIG. 11 only). - Projecting distally forward of
clutch sleeve 146,rotary housing 130 has acoupling neck 156. Couplingneck 156 has a diameter less than that ofclutch sleeve 146. Thecoupling neck 156 is formed to define four equangularly spaced apartslots 158.Slots 158 extend longitudinally along thecoupling neck 156 and are generally located in the most distal portion of thecoupling neck 158. - A
head 160 forms the most distal section ofrotary housing 130.Head 160 extends forward from and has a diameter less than that ofcoupling neck 156.Head 160 is formed with an inwardly directedcircumferential lip 162.Lip 162 defines the open distal end of the rotary housing, (distal end opening not identified). -
Rotary housing 130 is further formed so that extending axially, distally forward frombore 136 there is abore 166 that extends to the distal end of the housing.Bore 166 has sections of different diameters. The diameters of the different bore sections (not identified) are generally sized relative to each other in the same manner the outer diameters of theclutch sleeve 146 andcoupling neck 156, andhead 160 correspond to each other. Therotary housing 130 is further formed to have agroove 168 that extends inwardly from a housing inner wall that defines one of the sections ofbore 166. Specifically, groove 168 is formed in the housingclutch sleeve 146 so as to be immediately distal to the circular slice of thesleeve 146 in whichouter circumference groove 152 is formed. -
Bearing assemblies FIGS. 2A and 13 , rotatably hold the spindle and outer coupler sub-assembly to therotary housing 130. The outer race of bearing assembly 172 (outer race not illustrated) seats against the bore 166-defining inner wall of the housingclutch sleeve 146. The proximal end of the bearing race seats against the stepped inner annular surface of the rotary housing between theclutch sleeve 146 and thecoupling neck 156. The proximally-directed face of the outer race of bearingassembly 172 abuts a retainingring 174 disposed inbore 166. Retainingring 174 is snap fitted inrotary housing groove 168. - The inner race of bearing assembly 172 (not illustrated) is press fit over
spindle collar 106. When thehandpiece 20 of this invention is assembled, the proximal end of the inner race of bearing assembly is disposed against the annular portion of the distally directed face of the adjacentouter coupler 124. As discussed above, the outer race of bearingassembly 172 is blocked from distal movement by the adjacent inner walls of therotary housing 130. Thus, the abutment of theouter coupler 124 against the inner race of bearingassembly 172 by extension blocks distal movement of the spindle and outer coupler sub-assembly. -
Bearing assembly 173 extends between the distal front end ofspindle stem 112 and the adjacent inner wall of therotary housing head 160. The outer race of bearing assembly 173 (race not illustrated) seats against the inner wall of therotary housing 130 within thehousing head 160. The bearing assembly outer race also abuts the proximally directed surface ofrotary housing lip 162. The distally directed face of the inner race of bearing assembly 173 seats against a retainingring 175. Retainingring 175 is snap fitted intogroove 118 ofspindle stem 112. Thus, collectively,rotary housing lip 162 and retainingring 175 block forward movement of bearingassembly 173. -
Washers ring 178 cooperate to prevent proximal movement of bearingassembly 173. Twowashers 176 are provided. The more distal of the twowashers 176 is disposed against the proximally-directed face of the bearingassembly 173.Washer 177, which is flexible wave washer, is sandwiched between the distal andproximal washers 176. The retainingring 178 seats inspindle groove 116. The retainingring 178 extends above the outer surface of the surroundingspindle sleeve 112. When handpiece 20 is assembled, the exposed portion of the retainingring 178 blocks proximal movement ofwashers assembly 173.Wave washer 177 is provided to ensure that, in the event of manufacturing variations, thedistal washer 176 is disposed against the bearingassembly 173. -
Washers 176 are L-shaped. The short vertical sections of thewashers 176, (not identified) are disposed around the outer surface of thespindle stem 112. Thewasher 176 closest to bearingassembly 173 is positioned so its vertical section is against the inner race of the bearing assembly. This arrangement holds thewasher 176 off the inner race of the bearingassembly 173. Thewasher 176adjacent retaining ring 178 is positioned so that its vertical section abuts the retaining ring. - When the spindle and outer coupler sub-assembly is so positioned, gear train drive heads 86 and 92 are both seated in the outer coupler proximal end bore 126.
Slots 134 are formed in theouter coupler 124 so as to extend over the drive heads 86 and 92. Also, the components of this invention are dimensioned so that when thespindle 42 is seated in therotary housing 130, the most distal end of the spindle projects a slight distance forward of the surrounding distal end of the rotary housing. - The construction of the clutch 44 is now described by reference to
FIGS. 2A and 13 . The clutch includes a circularinner shifter 180 disposed inside the rotary housingclutch sleeve 146 over theouter coupler 124. As best seen inFIGS. 14 and 15 , inner shifter has aproximal end base 181. Extending distally forward frombase 181, theinner shifter 180 is shaped to have ahead 182.Head 182 has an outer diameter less than that ofbase 181. A constant diameter bore 183 extends axially through theinner shifter 180 from the proximal end ofbase 181 to the distal end ofhead 182. -
Inner shifter 180 is shaped so that when theouter coupler 124 is seated inbore 183, the shifter is able to move longitudinally along the length of the outer coupler.Clutch 44 includes four equangularly spaced apart torque pins 184 that extend radially inwardly from theinner shifter base 181. Eachtorque pin 184 is seated in a laterally extending opening 185 formed in theinner shifter base 181. Eachtorque pin 184 extends through an associated one of theouter coupler slots 134. Torque pins 184 are of sufficient length so end tips of the pins can seat innotches - A
shifter housing 186 disposed over theinner shifter 180 longitudinally moves theinner shifter 180 over theouter coupler 124. Theshifter housing 186, now described by reference toFIGS. 16 and 17 , is generally in the form of a constant outer diameter, ring shaped structure. Shifterhousing 186 is further formed to, at the proximal end, have an inwardly extendinglip 188. Agroove 190 extends inwardly from the annular inner wall of theshifter housing 186 that defines thecenter opening 192 through the housing.Groove 190 is located proximal to the distal end face of theshifter housing 186. Theshifter housing 186 is further formed to define, on the outer surface, two diametrically opposedspherical indentations 194. - Shifter
housing 186 is disposed in the rotary housingclutch sleeve 146.Inner shifter head 182 is positioned inside theshifter housing 186. A bearingassembly 196 is disposed between the outer circumferential wall of theinner shifter head 182 and the adjacent inner wall of theshifter housing 186. The proximal end of bearingassembly 196 abuts the adjacent distally-directed annular surface of theinner shifter base 181 that projects radially beyondhead 182. The outer perimeter of the distally directed face of bearingassembly 196 abuts a retainingring 198 fitted to theshifter housing 186. Specifically, retainingring 198 is snap fitted inshifter housing groove 190. Thus, the capture of the opposed ends of bearingassembly 196 by theinner shifter base 181 and retainingring 198 lock theinner shifter 180 andshifter housing 186 together for longitudinal movement.Bearing assembly 196 allows theinner shifter 180 andshifter housing 186 to axially rotate relative to each other. - A
shift ring 202 rotatably mounted over the rotary housingclutch sleeve 146 is manually actuated to set the longitudinal position of theshifter housing 186 and, by extension, theinner shifter 180. Seen best inFIGS. 18 and 19 , theshifter ring 202 is generally in the form of a tubular member.Indentations 204 formed in the outer surface of theshifter ring 202 facilitate the finger grasping of the ring. Theshifter ring 202 is further shaped to define an axially extending throughbore 206.Bore 206 is dimensioned to allow theshift ring 202 to rotate over the underlying rotary housingclutch sleeve 146. At the proximal end, shifter ring defines afirst counterbore 208 that defines the proximal end opening intobore 206. Asecond counterbore 210 is located between the first counter bore 208 and bore 206. Thesecond counterbore 210 has a diameter between that ofbore 206 andcounterbore 208. - At the distal end,
shift ring 202 is formed to have athird counterbore 212. Thethird counterbore 212 forms the distal end opening intobore 206. The second andthird counterbores shift ring 202 that defines bore 206 is further formed to define two longitudinally extending, diametrically opposedconcave grooves 214. Eachgroove 214 extends from thesecond counterbore 210 to thethird counterbore 212. - When handpiece 20 of this invention is assembled,
ball bearings 216 transfer the rotational motion ofshift ring 202 into axial motion that displaces theshifter housing 186. Eachball bearing 216 is seated in opposed ones of the rotary housingclutch sleeve slots 148. Twoball bearings 216 are provided; there are fourslots 148. Theadditional slots 148 aid component orientation during assembly of thehandpiece 20. Inside therotary sleeve 130, each ball bearing 216 seats in a separate one of theindentations 194 formed in theshifter housing 186. Outside ofrotary housing 130, each ball bearing 216 seats in a separate one of thegrooves 214 formed inshift ring 202. - When handpiece 20 of this invention is assembled,
rotary housing flange 142 seats in the shift ringfirst counterbore 208. O-rings 218 extend between the outer circumferential face ofrotary housing 130 and the inner walls ofshift ring 202. A first O-ring 218 is seated in the annular space of shift ringsecond counterbore 210. The second O-ring 218 is seated is seated in the shift ringthird counterbore 212. Both O-rings 218 extend over the smooth outer surface of the rotary housingclutch sleeve 146. - A
shift ring nut 220 holds theshift ring 202 to the rest of thehandpiece 20.Shift ring nut 220, best seen inFIGS. 20 and 21 , is generally tubularly shaped. Theshift ring 220 is formed to have a base 222 with a generally constant outer diameter. Forward ofbase 222shift ring nut 220 has ahead 224. Extending distally forward, the outer diameter of theshift ring head 224 tapers inwardly. Theshift ring 220 is further formed to define twoopposed flats 226 in the proximal end of the outer surface ofbase 222.Flats 226 receive a fastening tool used to screw secure theshift nut 220 to therotary housing 130 during assembly. -
Bore 228 extends axially through theshift ring nut 220 from the proximal end to the distal end. The shift ring is further formed to have an inwardly steppedannular lip 230 that extends inwardly from the inner circular wall that defines bore 228. The inner round face oflip 230 is formed with threading 231 (seen inFIG. 20 ). Theshift ring nut 220 is screw secured to the rotary housing by engaging shift ring nut threading 231 with threading 154 on the rotary housingclutch sleeve 146. - An understanding of the
coupling assembly 46 of the surgical handpiece of this invention is now obtained by initial reference toFIGS. 2A, 3 and 22 . Specifically,coupling assembly 46 includes two cylindrical retaining pins 240 each of which is seated in one of thespindle slots 114. When pins 240 are in the most forward position inslots 114, the pins seat in a groove (indentation) 306 formed in thecoupling head 54 of the attachment/accessory attached to thehandpiece 20.Pins 240 thus hold the attachment/accessory to thetool spindle 42. - An
inner washer 242 andouter washer 248 are the components ofcoupling assembly 46 that releasably hold retaining pins inslots 114 and attachment/accessory indentation 306.Inner washer 242 is shaped to have along any one slice thereof an L-shaped cross sectional profile. More specifically, the inner washer hascylindrical base 244 that extends over thespindle stem 112. Thespindle 42 andinner washer 242 are dimensioned relative to each other such that the inner washer can freely move longitudinally over the spindle.Inner washer 242 is further shaped to have alip 246 that extends perpendicularly outwardly from the distal front end ofbase 244. -
Inner washer 242 nests in theouter washer 248, also disposed over thespindle stem 112. The outer washer is shaped to have flat, circularly shapedhead 250. Extending proximally rearwardly from the outer perimeter of thehead 250 and formed integrally with the head is a cylindrically shapedskirt 252. Theouter washer 248 is positioned over thespindle stem 112 so that thewasher head 250 is generally aligned with the distal ends of thespindle slots 114. The distal end of theinner washer 242 is disposed in the annular space defined by the outer wall of thespindle stem 112 and the inner wall ofskirt 252 of theouter washer 248. - A
coil spring 254 disposed around the spindle stem 112 normally urges theinner washer 242 towards theouter washer 248. The proximal end ofspring 254 seats against awasher 256 seated over the most distal portion of thespindle collar 106. The proximally-directed face ofwasher 256 abuts a retainingring 258. Retainingring 258 is snap fitted inspindle groove 108 and projects beyond the outer surface of thespindle collar 106. The retaining ring 259 thus stops proximal movement ofwasher 256 and, by extension,spring 254. Awasher 257 is disposed between the proximally directed face of retainingring 258 and the adjacent distally directed face of the inner race of bearingassembly 172. -
Spring 254 thus urges theinner washer 254 forward. This movement of theinner washer 254 first compression traps the retaining pins 240 trapped between the inner andouter washers spring 254 continues to urgewashers spindle slots 114. The distal forward movement of this sub-assembly is stopped by the abutment of retainingpins 240 against the inner surfaces of thestem sleeve 112 that define the distal perimeters ofslots 114. When pins 240 are so positioned, each pin extends intospindle bore 120. - An
actuating ring 262 selectively moveswashers accessory indentation 306 in which they are seated. Theactuating ring 262 extends circumferentially around the outer perimeter of the distal end of the rotaryhousing coupling neck 156. Now described in detail by reference toFIGS. 23 and 24 , theactuating ring 262, which is generally ring shaped, is formed to have aproximal end base 264. The outer circumferential surface of theactuating ring base 264 is provided with threading, (not illustrated). Actuatingring 262 is further formed so that extending distally forward ofbase 264 there is aneck 266.Neck 266 has an outer diameter less than that of thebase 264. The inner wall that defines the through bore through the actuating ring 262 (bore and inner wall not identified) is of a constant diameter along the length of the sleeve. - Four equangularly spaced apart pins 268 are mounted in
radial openings 270 formed in theactuating ring neck 266.Pins 268 are directed inwardly towards the axial center of theactuating ring 262. When handpiece 20 of this invention is assembled, pins 268 extend throughslots 158 formed in the rotaryhousing coupling neck 156. The seating ofpins 268 in therotary housing slots 158 limits the range of proximal and distal movement of theactuating ring 262.Pins 268 are of sufficient length that, when theactuating ring 262 is moved proximally rearward, the free ends of the pins press against the distally directed face ofhead 250 of theouter washer 248. - An
actuator sleeve 272 functions as a handhold that allows the surgical personnel to move theactuating ring 262. As seen inFIGS. 25 and 26 , theactuator sleeve 272 is formed so as to have along the outer surface thereof four spaced aparttabs 274.Tabs 274 function as finger holds that allow personnel to hold and rearwardly depress theactuator sleeve 272. In the sleeve ofFIG. 1 , a singlecircumferential lip 274 a performs the same function astabs 274. - The
actuator sleeve 272 has an axially extending bore that extends completely through the sleeve. The bore has a firstproximal end section 276. Forward of section 278 the bore has asecond section 280.Section 280 has a diameter less than that of bore section 278. The inner wall of theactuator sleeve 272 that definesbore section 280 has threading, (not illustrated). Forward ofbore section 280, actuatingsleeve 272 is formed to have abore section 282. (Betweenbore sections Bore section 282 has an outer diameter less than that ofbore section 280.Bore section 284, is the most distal section of the actuating sleeve through bore.Bore section 284 has a diameter less than that ofbore section 282. - When the
handpiece 20 is assembled, theactuator sleeve 272 is secured to and over theactuating ring 262. Specifically, the threaded surface that definesbore section 280 of theactuator sleeve 272 is screw secured to the threading on outer surface of the actuating ring base orring base 264. - A
coil spring 286 normally holds theactuating ring 262 distally forward, away from theouter washer 248.Spring 286 is disposed between the rotaryhousing coupling neck 156 and theshift ring nut 220. The proximal end ofcoil spring 282 seats against the outer annular step surface between the rotary housing couplingclutch sleeve 146 and thecoupling neck 156. The distal end ofspring 286 seats against the proximally directed face of theactuating ring base 264.Spring 286 urges actuating ring forward so as that pins 268 are normally spaced away fromouter washer 248. - A
torque ring 288 is press fit over therotary housing head 160.Torque ring 288 is formed with two opposed laterally extendingtabs 290. When thehandpiece 20 is assembled the whole of thetorque ring 290 is normally disposed inbore section 284 of theactuating sleeve 272.Torque ring 288 is shaped so thattabs 290 do not abut, and therefore do not restrict the movement of theactuating sleeve 272. When an attachment is fitted tohandpiece 20, at least one torque ring tab may seat in a complementary notch formed in an exposed static component of the attachment. This engagement prevents the static elements of the attachment from rotating relative to thehandpiece 20. In alternative versions of the invention,torque ring 288 has asingle tab 290 or three ormore tabs 290. - The cutting
accessory 48 constructed in accordance with this invention is now described by reference toFIGS. 27 and 27A . The cuttingaccessory 48 has an elongatedshaft 52. Thecoupling head 54 is integrally attached to the proximal end of theshaft 52. Couplinghead 54 has the features that both receive the torque generated by thehandpiece 20, facilitate the lock the cutting accessory 300 to the handpiece and inhibit the generation of accessory wobble. - The
tissue working head 50 is attached to the distal end of theshaft 52. In the illustrated version of the invention, thetissue working head 50 is an acetabular reamer. It is understood that this is exemplary not limiting. In other versions of the invention, the tissue working head may be other members such as a drill head or a bur. Also, it should be understood that in some versions of the invention, the tissue working head may be releasably attached to theshaft 52. For example, a reamer head is often removably attached to theshaft 52 employed to rotate the reamer. - The
coupling head 54, the most proximal end of theaccessory 48, is formed to have three longitudinally spaced apart sections. The first, most proximal section of thecoupling head 54 is aboss 302.Boss 302 is dimensioned to closely slip fit in spindle bore 104 and receive the torque output by thespindle 42. In the illustrated versions of the invention, bore 104 has a hexagonal cross sectional profile. Therefore, in this version of the invention,coupling head boss 302 has a hexagonal shape and is dimensioned to be of marginally smaller size thanbore 104. The individual outerfacial surfaces 303 of boss receive the torque that is transmitted by the complementary adjacentinner faces 105 ofspindle 42. - The second, intermediate section of
coupling head 54 is thebody 304.Coupling head body 304 is shaped to closely slip fit inspindle bore 120. In the illustrated version of the invention, spindle bore 120 has a circular cross sectional shape.Coupling head body 304 has an identical circular cross section shape with a diameter marginally less than that of spindle bore 120. Thecoupling head body 304, it is further understood, occupies a cross sectional area greater than that occupied by thecoupling head boss 302. Thecoupling head body 304 is further formed to have agroove 306 that extends circumferentially around the outer surface of the body.Groove 306 is positioned at approximately midway between the proximal and distal ends of the body. More particularly,groove 306 is positioned so that, when thecoupling head 54 is seated in thehandpiece spindle 42, the proximal surface of thehead body 304 that defines the groove is approximately aligned with the proximal interior surfaces ofspindle 42 that definespindle slots 114. - The proximal end of the
coupling head body 304 is further formed to define a number of circumferentially spaced apart,slots 308. The base of eachslot 308 is defined by aflat face 310 that is recessed relative to the surrounding curved outer surface of the rest of thecoupling head body 304. Eachface surface 310 is coplanar with and extends distally forward from a separate one of the faces forming the hexagonalcoupling head boss 302. The proximal end sections of the portions of thecoupling head 304 betweenslots 308 are formed with beveled faces 312. Each pair of beveled faces 312 meets at apoint 314. -
Shoulder 305 is the most distal section of thecoupling head 54. Theshoulder 305, which is contiguous withcoupling head body 304, has a diameter greater than that of the body. In some versions of the invention, especially in coupling heads integral with an attachment 320 (FIG. 32 ) as described below,shoulder 305 is physically separate from the rest of thecoupling head 54. In these versions of the invention,shoulder 305 is press fit over the associated shaft to rotate in unison with the shaft. -
Surgical handpiece 20 of this invention is prepared for operation by inserting cuttingaccessory 48 into thehandpiece spindle 42. This process begins by the insertion of the cuttingaccessory coupling head 54 inspindle bore 120. Eventually points 314 of thecoupling head body 304 press against pins 240. The manual force of this action is enough to overcome the opposite force imposed byspring 254. Thus, the continued application of this force results in the pushing ofpins 240 diagonally outwardly and rearwardly.Pins 240 thus ride up over the outer surface of thecoupling head body 304. - As
coupling head 54 is continued to be inserted into thespindle 42, one of the beveled faces 312 of thecoupling head body 304 abutsspindle pin 121. The continued insertion of thecoupling head 54 results in the rotation of the coupling head untilpin 121 seats in thebody slot 308 with which thebeveled face 312 is adjacent. This rotational movement of thecoupling head 54 ensures that, as the coupling head is continued to be inserted into thespindle 42, thecoupling head boss 302 is aligned with and seats in the spindle bore 104. - Once the
accessory coupling head 52 is so seated,spring 254 pushes the sub-assembly ofpins 240 andwashers pins 240 moving diagonally forward inspindle slots 114, toward the coaxial longitudinal center axes of theaccessory coupling head 54 and the spindle bore 120. This results in the seating of pins incoupling head groove 306, as seen inFIGS. 28 and 29 . This seating ofpins 240 ingroove 306latches coupling head 54 and, therefore, cuttingaccessory 48, to thehandpiece spindle 42. -
Clutch 44 is then set to couple thespindle 42 to one of the gear train drive heads 86 or 92 so that the spindle rotates with the selected drive head. Specifically, the clutch 44 is set so that torque pins 184 seat in thenotches drive head shift ring 202. The rotation ofshift ring 202 results in the helical movement ofball bearings 216 inrotary housing slots 148. The longitudinal displacement ofball bearings 216 results in an identical longitudinal displacement of theshifter housing 186. The longitudinal movement of theshifter housing 186 causes a like movement of theinner shifter 180. - Since torque pins 184 are integral with
inner shifter 180, longitudinal displacement of the inner shifter results in the selective seating of the pins in either thenotches 88 of the proximally locateddrive head 86 ornotches 94 of the distally locateddrive head 92. -
Handpiece 20 of this invention is now ready for operating. The depression oftrigger switch 32 results in the actuation ofmotor 24.Motor shaft 26 rotates.Gear train 36 reduces the rotation moment output by shaft to two different speeds. Specifically, the gears internal to the gear traincause drive head 86 to rotate at a first reduced speed. Drivehead 92 is caused to rotate at a second reduced speed less than the first reduced speed. - Depending on the setting of the clutch 44, the torque pins 184 are seated in the
notches drive head outer coupler slots 134. Consequently, the rotation of the torque pins results in a like movement of theouter coupler 124 and, therefore spindle 42. Since thecoupling head boss 302 is relatively closely fitted in the spindle bore 104, and these components have non-circular cross sectional profiles, rotary motion of thespindle 42 is transferred byboss 302 to thecoupling head 54 and the rest of the cuttingaccessory 48. - When it is time to remove the cutting
accessory 48,actuator sleeve 272 is pushed rearwardly. This movement of theactuator sleeve 272 results in a diagonal rearward and outward movement ofpins 240.Pins 240 thus retract out of thecoupling head groove 306 and spindle bore 120, as seen inFIGS. 30 and 31 . This allows the cuttingaccessory 48 to be removed and a new accessory to be removably coupled to thehandpiece 20. -
Clutch 44 ofsurgical handpiece 20 of this invention is constructed so that torque pins 184 directly transfer the rotational motion output by adrive head clutch pin 184 extends laterally through theoutput coupler 124, which is an extension ofspindle 42. Thus, theclutch pins 184 do not occupy a significant amount of longitudinal space. Also, theshifter housing indentations 194 in whichball bearings 216 are spaced relatively close to the clutch pins 184. In some versions of this invention, the distance from the center of theindentions 194 to the center of the clutch pins is 2.0 cm or less. In more preferred versions of this invention this distance is 1.0 cm or less. Collectively, these features of the invention make it possible to provide an inner shifter and shifter housing assembly that has an overall length of 3.0 cm and, more preferably, 2.0 cm or less. In most preferred versions of this invention, the overall length of this sub-assembly is 1.0 cm or less. - Thus, the clutch 44 of this invention is relatively compact in length. This makes it possible to provide a handpiece with gear train and clutch assembly that likewise has a reduced axial length. Moreover, employing the clutch 44 of this invention reduces the extent to which the mass of components forming the
handpiece 20 are distributed away from the center of gravity. By centering the component mass near the center line of the center of gravity, the stress to which a surgeon is exposed when precisely positioning thehandpiece 20 is reduced. - When an attachment/cutting accessory coupling head is fitted to the
spindle 42 of the handpiece of this invention, there is a relatively long and close interface between the inner wall of thespindle 42 that defines bore 120 and the outer surface of thecoupling head body 304. In some versions of this invention, this interface has a length of 0.6 inches or more. In more preferred versions of the invention, this interface has a length of 1.0 inches or more. This interface is located distal to where the spindle transfer torque to thecoupling head boss 302. This construction minimizes the wobble of the coupling head in the spindle when both components are rotated. The minimization of the coupling head wobble results in a like reduction of the wobble present at the cutting accessorytissue working head 50. - Moreover, when coupling
head 54 is fitted in spindle bore 120, thecoupling head shoulder 305 abuts the distal end opening of the spindle that defines the bore. Thus collectively, pins 240 andshoulder 305 prevent longitudinal wobble of thecoupling head 54 in the spindle. Since the distal end of therotating spindle 120 is spaced slightly forward of the static components of thehandpiece 20, the presence ofshoulder 305 does not inhibit rotation of the cuttingaccessory 48. To further ensure that there is no contact between theshoulder 305 and the static components of thehandpiece 20, the shoulder is dimensioned so it does not subtend area subtended by the static components. Thus, the outer diameter ofshoulder 305 is less than the distal end opening into the rotary housing defined bylip 162. -
FIG. 32 illustrates anattachment 320 constructed in accordance with this invention.Attachment 320 includes ahousing 322. Aninput shaft 324 is extends rearwardly from thehousing 322. Input shaft is shaped to have a proximalend coupling head 326 with the same features as cuttingaccessory coupling head 54. Internal to the housing is acoupling assembly 328 represented by a phantom rectangle.Coupling assembly 328 is designed to releasably hold the proximal end of a cutting accessory (not illustrated) for rotation. The exact structure of thecoupling assembly 328 is not relevant to this invention.Coupling assembly 328 may include the features ofcoupling assembly 46. Alternatively,coupling assembly 328 may be provided with features to hold coupling heads other than the describedcoupling head 54 for rotation. These include coupling heads with trinkle fittings, Hudson® fittings and modified trinkle fittings that are known in the surgical art. -
Input shaft 324 rotatescoupling assembly 328. In some versions of the invention,input shaft 324 and the spindle ofcoupling assembly 328 are the same component. In these versions of the invention,attachment 320 thus serves as a means for connecting an accessory with a head different fromcoupling head 54 to the handpiece. In these versions of the invention, the attachment rotates at the speed at which thehandpiece spindle 42 rotates. In other versions of the invention, there is a speed reducer or speed increases gear assembly internal to theattachment housing 322 for transferring the rotational moment received by theinput shaft 326 to the coupling head. The Applicants' Assignee's U.S. Pat. No. 5,993,454, DRILL ATTACHMENT FOR A SURGICAL DRILL, issued 30 Nov. 1999 and incorporated herein by reference, shows one such assembly. This type of attachment may be provided with a spindle and coupling assembly substantially identical to thespindle 42 andcoupling assembly 46 of this invention. - The foregoing is directed to one specific version of the invention. It should be appreciated that alternative versions of the handpiece, cutting accessory and attachment of this invention may have features different from what have been described.
- For example, there is no requirement that all handpieces of this invention include both the described clutch and coupling assembly. Some versions of the invention may have only the clutch or only the coupling assembly.
- The gear train and drive heads of this invention may be of different design. For example, in some versions of the invention, the gear train may have three or more drive heads, each or which, in response to the single input rotational moment, operates at a different rotational speed. In some versions of the invention, the gear train has gears that cause one or more drive heads to rotate at speeds faster than those at which the
motor shaft 26 rotates. - The means by which the
motor 22 rotatesshaft 26 may likewise vary from what has been described. - Similarly, the structure of the clutch 44 may differ from what has been described. For instance, some versions of the invention may have few or more laterally extending members, clutch pins or other torque transmitting components, for simultaneously engaging a gear
train drive head spindle 42. In some versions of the invention, clutch 44 may even include a single one of these members. - In some versions of the invention, the inner shifter and/or outer shifter may be arranged so that the points at which longitudinal motion are transferred to this sub assembly (
indentions 194 in the described embodiment) are within the longitudinal slice in which the lateral member that transfers torque from one of the drive heads to the spindle is located. Such construction can further reduce the overall longitudinal length of the clutch. - Also in some versions of the invention, the clutch pins may be integrally attached to the spindle. In these versions of the invention, the spindle itself is displaced in order to cause the clutch pins to engage the appropriate gear train drive head.
- Similarly, in other versions of the invention, means other than a rotating shift ring may be employed to set the position of the clutch pins. In some versions of the invention, a switch member moveable mounted to the handpiece housing to move longitudinally is the surgeon-actuated component that is displaced to set the position of the clutch pins.
- As seen in
FIGS. 33 and 34 , it is possible to provide the clutch assembly of this with a tactile and audible feedback assembly for indicating the switching of the clutch between the clutch states. In the illustrated feedback assembly, the feedback is provided by adetent ball 340.Detent ball 340 is seated in abore 342 formed in the base 181 a ofinner shifter 180 a. The detent ball is positioned to extend inwardly, towards theouter coupler 124 a. Aspring 344 is also seated on inner shifter bore 342 so as to urgeball 340 inwardly, toward theouter coupler 124. Shifterhousing 186, it is understood, is disposed over theinner shifter 180 a. Thus, the inner annular wall of theshifter housing 186 functions as the static surface against which the outer end ofspring 344 abuts. - The
outer coupler 124 a has the same basic geometry of the first described outer coupler 124 (FIGS. 8 and 9 ).Outer coupler 124 a is also formed to have two parallel arcuately extendgrooves 348.Grooves 348 are formed in the outer surface of theouter coupler 124 a between twoadjacent slots 134 formed in the coupler. A first one of thegrooves 348 is located adjacent the distal ends of theslots 134. The second groove is located adjacent the proximal end of theslots 134. - As the clutch is actuated,
inner shifter base 181 a moves between the opposed ends of theouter coupler slots 134. This movement of the inner shifter causesdetent ball 340 to move out of a first one of thegrooves 348 into thesecond groove 348. The spring resistance overcomes moving theball 340 out of thefirst groove 348 provides an initial tactile feedback that the clutch is being moved from a first state. When theinner shifter base 181 a is moved to the position wherein theclutch pins 184 engage the second one of the drive heads 86 or 92, thedetent ball 340 seats in thegroove 348 aligned with the drive head. This results in an audible mechanical. Also, the individual actuating the shift ring 202 (FIG. 1 ) is exposed to an additional resistance when try urge the ball out of the groove. - Thus, the feedback assembly of the clutch of this version of the invention provides feedback both when the clutch is moved from the first setting and when the clutch sets in the second setting.
- Also, the structure of the
coupling assembly 46 and complementary attachment/cutting accessory coupling head may vary from what has been described. There is no requirement that in all versions of the invention the surfaces of the spindle that output torque and complementarycoupling head boss 302 have a hexagonal or even a polygonal cross sectional profile. It is believed that a polygonal cross sectional geometry is the most efficient for ensuring torque transfer to the coupling head. - Similarly, the
coupling head body 304 may have a geometry different from what has been described and illustrated. There is no requirement that in all versions of the invention this component and the complementary spindle bore have circular cross-sectional profiles. In some versions of the invention, these components may even have one or more planar faces. It is believed though such geometry is an optimal geometry for reducing coupling head wobble. Similarly, there is no requirement that in all versions of the invention, the indentation defined by the coupling head body for receiving the locking member associated with the handpiece coupling assembly be an annular groove. In some versions of the invention, one or more indentations are provided in the coupling head body for receiving the complementary locking member integral with the complementary handpiece coupling assembly. - In some versions of the invention, the coupling body may not have any geometric features for receiving a complementary coupling assembly locking members. Also, there may be versions of the invention wherein the geometric features for facilitating the engagement of the handpiece coupling assembly with the coupling head project beyond the surface of the coupling head body.
- Similarly, there may be versions of the invention in which the coupling head body has a diameter that is identical with that of the distally adjacent attachment/accessory shaft. In still other versions of the invention, the attachment/accessory shaft may have a diameter greater than that of the coupling head.
- Likewise, an accessory/attachment coupling head of this invention may be constructed with geometric features different from
slots 308 and beveled faces 312 to facilitate the alignment of the coupling head in the spindle bore. Some versions of the invention may not even be provided with any of these features. - Other coupling assemblies may, instead of holding an attachment/accessory coupling head to the spindle serve only to cause the coupling head to be driven by the spindle.
- Therefore, it is an object of the appended claims to cover all such variations and modifications that come within the true spirit and scope of the invention.
Claims (21)
1. A surgical tool comprising:
a housing;
a motor disposed in said housing, said motor having a rotating shaft;
a spindle rotatably mounted to said housing, said spindle being connected to said motor shaft to be rotated by said motor shaft, said spindle having a distal end and being shaped to define: a distal bore that extends proximally from the distal end the spindle, the distal bore having an outer perimeter and proximal end; a proximal bore that is contiguous with the distal bore and extends proximally from the distal end of the distal bore, the proximal bore being defined by plural spindle inner faces that are located inwardly of the outer perimeter of the distal bore and that are shaped to transmit torque to the proximal end of the cutting accessory seated in the distal and proximal bores; and at least one opening into the distal bore that is located forward of the proximal end of the distal bore; and
a coupling assembly attached to said housing or said spindle for removably holding the cutting accessory in the spindle bore, said coupling assembling including at least one locking member that is positioned to move in and out of the at least one opening of into the distal bore so as move in and out of the distal bore, so that when said at least one locking member is disposed in the distal bore, said at least one locking member holds the proximal end of the cutting accessory in the distal and proximal bores of said spindle.
2. The surgical tool of claim 1 , further including a pin is statically mounted to said spindle so as to project into the distal bore of said spindle.
3. The surgical tool of claim 1 , wherein a pin is statically mounted to said spindle so as to project into the distal bore and said pin is mounted to said spindle so as to be located distal to the proximal end of the distal bore and proximal to the at least one opening formed in the distal bore.
4. The surgical tool of claim 1 , wherein said spindle is shaped so that the plurality of faces that define the proximal bore of said spindle are shaped so that the proximal bore, in cross section, is in the shape of polygon.
5. The surgical tool of claim 1 , further including a gear train that connects said rotating shaft of said motor to said spindle.
6. The surgical tool of claim 1 , further including a gear train that connects said rotating shaft of said motor to said motor and said gear train is configured to reduce the rotational speed of spindle relative to the rotation speed of said motor shaft.
7. The surgical tool of claim 1 , further including:
a gear train assembly mounted in said housing, said gear train assembly having a plurality of drive heads that are connected to said motor shaft to rotate at different speeds upon actuation of said motor shaft; and
a clutch assembly that selectively connects a single one of said gear train drive heads to said spindle so that said spindle is rotated by the said drive head to which said spindle is connected.
8. The surgical tool of claim 1 , wherein said:
said spindle is formed with a plurality of openings into the distal bore; and
said coupling assembly includes a plurality of locking members, each said locking member being positioned to move out of a separate one of the openings into the distal bore.
9. The surgical tool of claim 1 , wherein said coupling assembly at least one locking member is a pin.
10. The surgical tool of claim 1 , wherein: a longitudinal axis extends proximally to distally through the spindle; and said spindle is formed so that the at least one opening into the distal bore is in the form of a slot that is centered on a plane that is angled relative to the longitudinal axis of the spindle, the angle being selected so that the at least one locking member that moves in and out of the slot moves diagonally relative to the longitudinal axis of said spindle.
11. The surgical tool of claim 1 , wherein said spindle is further formed so that the distal bore has a circular cross sectional profile.
12. A surgical tool comprising:
a housing;
a motor disposed in said housing, said motor having a rotating shaft;
a spindle rotatably mounted to said housing, said spindle being connected to said motor shaft to be rotated by said motor shaft, said spindle shaped to have: a plurality of inner faces that define a proximal bore internal to the spindle, the inner faces shaped to transfer torque to a define a cutting accessory seated in the proximal bore; a distal bore that extends forward from the proximal bore to a distal end of the spindle so as to define a distal opening in the spindle for receiving the cutting accessory and, wherein, the distal bore has an outer perimeter that is located radially outwardly of the proximal bore; and at least one opening into the distal bore, the at least one opening being spaced distally away from the proximal bore;
a pin that is statically mounted to said spindle so as to extend in the distal bore, said pin being located distal to the proximal bore and proximal to the at least one opening into the distal bore; and
a coupling assembly attached to said housing or said spindle for removably holding the cutting accessory in the spindle bore, said coupling assembling including at least one locking member that is positioned to move in and out of the at least one opening of into the distal bore so as move in and out of the distal bore, so that when said at least one locking member is disposed in the distal bore, said at least one locking member holds the proximal end of the cutting accessory in the distal and proximal bores of said spindle.
13. The surgical tool of claim 12 , wherein said spindle is shaped so that the plurality of inner faces that define the proximal bore of said spindle are shaped so that the proximal section of the spindle bore, in cross section, is in the shape of a polygon.
14. The surgical tool of claim 12 , wherein said spindle is shaped so that the plurality of inner faces that define the proximal bore of said spindle are shaped so that the proximal section of the spindle bore, in cross section, is in the shape of a hexagon.
15. The surgical tool of claim 12 , further including a gear train that connects said rotating shaft of said motor to said spindle.
16. The surgical tool of claim 12 , further including a gear train that connects said rotating shaft of said motor to said motor and said gear train is configured to reduce the rotational speed of spindle relative to the rotation speed of said motor shaft.
17. The surgical tool of claim 12 , further including:
a gear train assembly mounted in said housing, said gear train assembly having a plurality of drive heads that are connected to said motor shaft to rotate at different speeds upon actuation of said motor shaft; and
a clutch assembly that selectively connects a single one of said gear train drive heads to said spindle so that said spindle is rotated by the said drive head to which said spindle is connected.
18. The surgical tool of claim 12 , wherein said:
said spindle is formed with a plurality of openings into the distal bore; and
said coupling assembly includes a plurality of locking members, each said locking member being positioned to move out of a separate one of the openings into the distal bore.
19. The surgical tool of claim 12 , wherein said coupling assembly at least one locking member is a pin.
20. The surgical tool of claim 12 , wherein: a longitudinal axis extends proximally to distally through the spindle; and said spindle is formed so that the at least one opening into the distal bore is in the form of a slot that is centered on a plane that is angled relative to the longitudinal axis of the spindle, the angle being selected so that the at least one locking member that moves in and out of the slot moves diagonally relative to the longitudinal axis of said spindle.
21. The surgical tool of claim 12 , wherein said spindle is further formed so that the distal bore has a circular cross sectional profile.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/947,465 US20160206327A1 (en) | 2005-06-25 | 2015-11-20 | Surgical handpiece with a drive spindle having a distal bore to which locking elements are mounted and an adjacent proximal bore defined by faces shaped to transfer torque to the attached cutting accessory |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US69363805P | 2005-06-25 | 2005-06-25 | |
US11/471,266 US8419760B2 (en) | 2005-06-25 | 2006-06-20 | Cutting accessory for a powered surgical handpiece, the cutting accessory including features to facilitate the alignment of the accessory with the handpiece, hold the accessory to the handpiece, facilitate the transfer of torque to the accessory and reduce the wobble of the accessory |
US13/795,064 US9192394B2 (en) | 2005-06-25 | 2013-03-12 | Surgical handpiece with a compact clutch |
US14/947,465 US20160206327A1 (en) | 2005-06-25 | 2015-11-20 | Surgical handpiece with a drive spindle having a distal bore to which locking elements are mounted and an adjacent proximal bore defined by faces shaped to transfer torque to the attached cutting accessory |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US13/795,064 Division US9192394B2 (en) | 2005-06-25 | 2013-03-12 | Surgical handpiece with a compact clutch |
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US20160206327A1 true US20160206327A1 (en) | 2016-07-21 |
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Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
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US11/471,266 Active 2031-01-28 US8419760B2 (en) | 2005-06-25 | 2006-06-20 | Cutting accessory for a powered surgical handpiece, the cutting accessory including features to facilitate the alignment of the accessory with the handpiece, hold the accessory to the handpiece, facilitate the transfer of torque to the accessory and reduce the wobble of the accessory |
US13/795,064 Active 2026-09-09 US9192394B2 (en) | 2005-06-25 | 2013-03-12 | Surgical handpiece with a compact clutch |
US14/947,465 Abandoned US20160206327A1 (en) | 2005-06-25 | 2015-11-20 | Surgical handpiece with a drive spindle having a distal bore to which locking elements are mounted and an adjacent proximal bore defined by faces shaped to transfer torque to the attached cutting accessory |
Family Applications Before (2)
Application Number | Title | Priority Date | Filing Date |
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US11/471,266 Active 2031-01-28 US8419760B2 (en) | 2005-06-25 | 2006-06-20 | Cutting accessory for a powered surgical handpiece, the cutting accessory including features to facilitate the alignment of the accessory with the handpiece, hold the accessory to the handpiece, facilitate the transfer of torque to the accessory and reduce the wobble of the accessory |
US13/795,064 Active 2026-09-09 US9192394B2 (en) | 2005-06-25 | 2013-03-12 | Surgical handpiece with a compact clutch |
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EP (1) | EP1919377B1 (en) |
JP (3) | JP5174658B2 (en) |
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WO2024035819A1 (en) | 2022-08-09 | 2024-02-15 | Stryker Corporation | Surgical handpiece for driving orthopedic pins and related accessories |
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2006
- 2006-06-20 JP JP2008518361A patent/JP5174658B2/en active Active
- 2006-06-20 WO PCT/US2006/024200 patent/WO2007002230A1/en active Application Filing
- 2006-06-20 AU AU2006262239A patent/AU2006262239B2/en active Active
- 2006-06-20 US US11/471,266 patent/US8419760B2/en active Active
- 2006-06-20 EP EP06773719A patent/EP1919377B1/en active Active
- 2006-06-20 CA CA002612972A patent/CA2612972A1/en not_active Abandoned
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2012
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2013
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2015
- 2015-11-20 US US14/947,465 patent/US20160206327A1/en not_active Abandoned
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WO2024035819A1 (en) | 2022-08-09 | 2024-02-15 | Stryker Corporation | Surgical handpiece for driving orthopedic pins and related accessories |
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AU2006262239B2 (en) | 2013-01-17 |
JP5174658B2 (en) | 2013-04-03 |
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JP2008543503A (en) | 2008-12-04 |
US8419760B2 (en) | 2013-04-16 |
WO2007002230A1 (en) | 2007-01-04 |
EP1919377A1 (en) | 2008-05-14 |
AU2006262239A1 (en) | 2007-01-04 |
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Owner name: STRYKER CORPORATION, MICHIGAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:WIEBE, JAMES B., III;REEL/FRAME:044082/0947 Effective date: 20050719 |
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