Source: http://www.google.com/patents/US6221088?dq=mirroring+data+in+a+remote+data+storage+system
Timestamp: 2017-06-28 12:49:07
Document Index: 734654849

Matched Legal Cases: ['art 214', 'art 216', 'art 214', 'art 214', 'art 214', 'art 216', 'art 216', 'art 216', 'art 216', 'art 214', 'art 214', 'art 216', 'art 216', 'art 214']

Patent US6221088 - Powered handpiece and surgical blades and methods thereof - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsA powered handpiece for driving a surgical blade to cut anatomical tissue includes a reusable handpiece body having a distal end for being coupled with a surgical blade, a drive shaft in the handpiece body for rotatably driving the surgical blade, a motor assembly for being installed in the handpiece...http://www.google.com/patents/US6221088?utm_source=gb-gplus-sharePatent US6221088 - Powered handpiece and surgical blades and methods thereofAdvanced Patent SearchTry the new Google Patents, with machine-classified Google Scholar results, and Japanese and South Korean patents.Publication numberUS6221088 B1Publication typeGrantApplication numberUS 09/450,788Publication dateApr 24, 2001Filing dateNov 30, 1999Priority dateSep 24, 1996Fee statusPaidAlso published asDE69727183D1, DE69727183T2, DE69734845D1, DE69734845T2, EP0830846A1, EP0830846B1, EP1256319A2, EP1256319A3, EP1256320A2, EP1256320A3, EP1256321A2, EP1256321A3, EP1256322A2, EP1256322A3, EP1256322B1, US5910152, US5916231, US5957945, US6010477Publication number09450788, 450788, US 6221088 B1, US 6221088B1, US-B1-6221088, US6221088 B1, US6221088B1InventorsF. Barry BaysOriginal AssigneeXomed Surgical Products, Inc.Export CitationBiBTeX, EndNote, RefManPatent Citations (33), Non-Patent Citations (8), Referenced by (53), Classifications (11), Legal Events (3) External Links: USPTO, USPTO Assignment, EspacenetPowered handpiece and surgical blades and methods thereof
US 6221088 B1Abstract
What is claimed is: 1. A surgical blade assembly for cutting anatomical tissue comprising
an elongate outer tubular member having an open distal end, an open proximal end and a lumen extending between said distal and proximal ends, and an outer member hub secured to said proximal end, said outer member hub having a configuration to be removably coupled to a powered surgical handpiece whereby said outer member is rigidly secured to the handpiece; and an elongate inner member including an inner tube movably disposed within said outer member and having a distal end for cutting anatomical tissue when said inner tube is moved within said outer member, a proximal end, a longitudinal axis and a lumen coaxial with said axis and extending between said distal and proximal ends of said inner tube, and an inner tube hub secured to said proximal end of said inner member, said distal end of said inner member being accessible to anatomical tissue via said open distal end of said outer member, said inner member hub having a configuration to be removably coupled to the powered surgical handpiece to be moved relative to said outer member to move said inner tube to cut anatomical tissue, said inner member hub having a passage coaxial with said longitudinal axis and extending entirely through said inner member hub, said inner member including a continuous suction passage formed by said lumen and said passage of said inner member hub, said suction passage extending, in its entirety, axially through said inner member from said inner member distal end of said inner tube through an open proximal end of said inner member hub for removal of cut anatomical tissue from said open proximal end of said inner member hub when said inner member hub is coupled to the powered surgical handpiece. 2. A surgical blade assembly as recited in claim 1 wherein said inner tube is rotatably disposed in said outer member.
3. A surgical blade assembly as recited in claim 2 wherein said distal end of said outer tube is configured to cooperate with said distal end of said inner member to effect a shearing action on anatomical tissue.
4. A surgical blade assembly as recited in claim 1 wherein said outer member hub includes an irrigation supply passage for supplying irrigation fluid between said outer member and said inner member to said distal end of said outer member.
5. A surgical blade assembly as recited in claim 4 and further including a seal disposed in said outer member hub proximally of said irrigation supply passage for preventing passage of irrigation fluid proximally from said outer member hub.
6. A surgical blade assembly for cutting anatomical tissue comprising
an elongate outer member having a distal end with an opening therein, an open proximal end and a lumen therethrough communicating with said opening and said open proximal end, and an outer member hub coupled with said proximal end, said outer member hub having a passage extending entirely therethrough in communication with said lumen, said outer member hub including an external flange for releasable, locking engagement with a powered surgical handpiece; and an elongate inner member including an inner tube extending through said passage to be movably disposed in said lumen and having an open distal end, an open proximal end extending proximally from said outer member hub and a lumen communicating with said distal end of said inner tube and said open proximal end of said inner tube, and an inner member hub coupled with said proximal end of said inner tube and disposed proximally of said outer member hub, said distal end of said inner tube having a cutting edge exposed by said opening in said distal end of said outer member for cutting anatomical tissue when said inner tube is moved relative to said outer member, said inner member hub including a plurality of longitudinally extending prongs having slots therebetween for releasable securement to a drive shaft of the powered surgical handpiece, said inner member hub having a longitudinal passage entirely therethrough in communication with said lumen of said inner tube, said inner member including a continuous suction passage formed by, said lumen of said inner tube and said passage, in its entirety, through said inner member hub, said suction passage extending from said distal end of said inner tube through a proximal end of said inner member hub whereby debris due to cutting is aspirated proximally from said proximal end of said inner member hub when said inner member hub is secured to the drive shaft of the powered surgical handpiece. 7. A surgical blade assembly as recited in claim 6 wherein said inner tube is rotatably disposed in said outer member.
8. A surgical blade assembly as recited in claim 6 wherein said cutting edge is aligned with said opening in said distal end of said outer member.
9. A surgical blade assembly as recited in claim 8 wherein said distal end of said outer member has a cutting edge cooperating with said cutting edge of said inner tube to cut anatomical tissue.
10. A surgical blade assembly as recited in claim 6 wherein said inner blade further includes a spring biased seal disposed distally of said prongs for providing longitudinal tolerance between said inner member and the drive shaft.
11. A surgical blade assembly as recited in claim 6 wherein said prongs terminate proximally at tapered tips.
This application is a continuation of prior application Ser. No. 09/005,012 filed Jan. 9, 1999, now U.S. Pat. No. 6,010,477 which is a divisional of prior application Ser. No. 08/775,147 filed Dec. 31, 1996 and now abandoned, which is a continuation-in-part of prior application Ser. No. 08/719,130 filed Sep. 24, 1996 and now abandoned, the disclosures of which are incorporated herein by reference.
FIG. 8. is a broken side view of a distal portion of a motor assembly of the handpiece.
A powered surgical handpiece 10 according to the present invention is illustrated in FIGS. 1 and 2 and includes a handpiece body 12 and a motor assembly 14 for being removably installed in handpiece body 12. The handpiece body 12 includes a collet assembly 16, a transfer hub assembly 18 and a motor enclosure 20. Collet assembly 16, as shown in FIG. 3, is designed to releasably couple a desired surgical blade to the handpiece body and includes an outer collet member 22, a middle collet member 24 and an inner collet member 26. Outer collet member 22, which is preferably made of stainless steel, is hollow and has a cylindrical rearward section 28 mounted to a forward end of transfer hub assembly 18 and a cylindrical forward section 30 extending distally from rearward section 28 in longitudinal or axial alignment therewith to terminate at a peripheral edge. Rearward section 28 has a uniform external diameter, smaller than a uniform external diameter of forward section 30, except for a distal portion of the rearward section 28 which is flared or of increasing external diameter in the distal direction to merge with the external diameter of the forward section 30. A plurality of longitudinally extending grooves or recesses 31 are formed in an external surface of the wall forming rearward section 28, the grooves 31 being of the same length and extending part way through the thickness of the rearward section wall. Grooves 31, which extend parallel to a longitudinal axis of the outer collet member 22, are juxtaposed to be laterally aligned with one another with little or no space between lateral or side edges of adjacent grooves 31 as shown in FIG. 1. A plurality of longitudinally extending grooves or recesses 32, similar to grooves 31, are formed in an external surface of the wall forming forward section 30 to extend part way through the thickness of the forward section wall. Grooves 32 extend parallel to the longitudinal axis of the outer collet member 22 and are juxtaposed to be laterally aligned with one another. The grooves 32 are laterally juxtaposed with a space between lateral or side edges of adjacent grooves 32 that is greater than the space between the side edges of grooves 31 as shown in FIG. 1. Grooves 32 are of the same length except for grooves 32′, spaced 90° from one another about the longitudinal axis of outer collet member 22, which-have a length less than the length of the remaining grooves 32. Set screws 33 are received in holes formed through the thickness of the forward section wall distally of and in longitudinal alignment with grooves 32′, respectively, with the set screws 33 disposed proximally of distal ends of the remaining grooves 32. The grooves 31 and 32 have rounded distal and proximal ends and serve to facilitate grasping of the handpiece body 12. Outer collet member 22 has a lumen or internal passage extending entirely therethrough with the rearward section 28 defining a rearward passage section of uniform diameter or cross-section, and the forward section 30 defining a forward passage section of uniform diameter or cross-section larger than the diameter or cross-section of the rearward passage section. The rearward section wall is of increased thickness along the distal portion of the rearward section 28 to define an internal shoulder 34 extending transverse to the longitudinal axis of the outer collet member 22 at the junction of the rearward passage section with the forward passage section. The set screws 33 protrude inwardly into the forward passage section.
Inner collet member 26 is preferably made of stainless steel and comprises an elongate, hollow cylindrical or tubular member of uniform external diameter defined by a wall of uniform thickness along a distal portion of the cylindrical member and of uniform greater thickness along the remainder of the cylindrical member to form an internal transverse shoulder 45. A lumen or internal passage is defined entirely through the inner collet member 26 and includes a rearward passage portion of uniform diameter or cross-section and a forward passage portion of uniform diameter or cross-section, larger than the uniform diameter or cross-section of the rearward passage portion, with the shoulder 45 being disposed at the junction of the forward and rearward passage portions. A plurality of semi-spherical holes 46 are formed through the wall of the distal portion of the inner collet member 26 at 120° spaced locations about a longitudinal axis of the inner collet member 26 with the holes 46 communicating with the forward passage portion. A spherical ball bearing 47, is disposed in each hole 46 such that the ball bearings 47 protrude externally beyond an external surface of the inner collet member 26 and protrude internally beyond an internal surface of the inner collet member to protrude into the forward passage portion while being prevented from passing through the holes 46 into the forward passage portion. The inner collet member 26 has an external diameter or size to be closely received in the rearward passage section of the outer collet member 22 with the external surface of the inner collet member in contact with an internal surface of the outer collet member.
Transfer hub assembly 18 is best illustrated in FIG. 4 and includes a transfer body 49 mounted to the collet assembly 16 and a drive unit 50 disposed in the transfer body 49 for driving a surgical blade inserted in collet assembly 16. Transfer body 49 is preferably made of titanium or stainless steel and includes a distal cylindrical extension 51 and a proximal cylindrical extension 52 longitudinally and laterally offset from and not aligned with one another and a midsection 53 extending diagonally or angularly between the distal and proximal cylindrical extensions. A recess extends longitudinally in the distal extension 51 to terminate proximally at an end wall 54 in the midsection 53. A recess extends longitudinally in the proximal extension 52 to terminate distally at an end wall 55 in midsection 53, the end wall 55 being disposed distally of and parallel to end wall 54. The distal and proximal extension recesses are parallel to one another and are in communication with one another in midsection 53. A tubular neck 56 extends longitudinally, distally from the distal extension 51 in longitudinal or axial alignment therewith and has an external diameter, smaller than the external diameter of the distal extension, to be closely received in the rearward section 28 of the outer collet member 22 with a distal end of neck 56 in abutment with the proximal end of inner collet member 26 and with a proximal peripheral edge of the outer collet member 22 in abutment with an external transverse shoulder at the junction of neck 56 with distal extension 51. The neck 56 is fixedly secured to the outer collet member 22, such as adhesively, with the lumen or internal passage of neck 56 longitudinally or axially aligned with the internal passage of inner collet member 26. A passageway 57 in the mid-section 53 extends longitudinally, proximally from end wall 54 in communication with the recess of distal extension 51. Passageway 57 includes a forward passageway portion or part longitudinally or axially aligned with the recess of distal extension 51 and a rearward passageway portion or part having a longitudinal axis disposed at a minimal acute angle with a longitudinal axis of the forward passageway portion. According to a preferred embodiment, the longitudinal axis of the rearward passageway portion is disposed at an angle of 15° to the longitudinal axis of the forward passageway portion. The rearward passageway portion of passageway 57 has an outlet along an external surface of midsection 53 to establish communication with the passageway 57 from externally of the handpiece body 12. The rearward passageway portion of passageway 57 receives a distal end of a suction tube 58. Suction tube 58, which is preferably made of stainless steel, has a distal tube segment terminating distally at the distal end received in passageway 57 and a proximal tube segment terminating proximally at an open proximal end for being coupled with a standard suction canister. The distal end of the suction tube is secured in passageway 57, such as adhesively, with the distal end of the suction tube located at the junction of the forward passageway portion with the rearward passageway portion. The distal segment of tube 58 is longitudinally or axially aligned with the rearward passageway portion of passageway 57. The proximal segment of tube 58 is disposed parallel with the forward passageway portion of passageway 57 and has a plurality of truncated conical configured barbs 59 adjacent the open proximal end thereof for connection with the suction canister. As shown in FIG. 4, three barbs 59 of increasing diametric size are arranged on tube 58 in order of size with the diametrically smallest barb disposed closest to the open proximal end of the suction tube. The recess of proximal extension 52 has a uniform diameter forward recess section and a uniform diameter rearward recess section, larger in diameter than the forward recess section, longitudinally or axially aligned with one another. An internal, transverse shoulder 60 is disposed in the proximal extension 52 at the junction of the forward and rearward recess sections. The transfer body 49 can have a plurality of external oblong recesses as shown in FIG. 1, the recesses extending part way through the thickness of the wall of the transfer body to facilitate manual grasping or gripping of the transfer body during use.
Drive unit 50, also shown in FIG. 4, includes a front drive shaft 61 disposed in the recess of distal extension 51 and a rear drive shaft 62 disposed in the recess of proximal extension 52. Front drive shaft 61, shown in FIG. 5, carries or is formed with a gear 63 and has a first cylindrical portion of uniform external diameter extending distally from gear 63 and a second cylindrical portion of uniform external diameter, smaller than the external diameter of the first cylindrical portion, extending distally from the first cylindrical portion in longitudinal or axial alignment therewith. An external, transverse shoulder 64 is defined on the front drive shaft 61 at the junction of the first and second cylindrical portions. Gear 63 has an external diameter or size greater than the external diameter of the first cylindrical portion and has a plurality of gear teeth 65 parallel with a longitudinal axis of the front drive shaft 61. A longitudinal bore 66 is formed entirely through the front drive shaft 61 and includes a distal bore section of uniform diameter extending part way through the second cylindrical portion and a proximal bore section of uniform diameter, smaller than the diameter of the distal bore section, extending longitudinally, proximally from the distal bore section through the remainder of the front drive shaft 61. A proximally angled or sloping internal shoulder 67 is disposed in bore 66 at the junction of the distal and proximal bore sections. A pair of apertures are formed through the wall of the front drive shaft close to a distal end thereof, the apertures being disposed at 180° spaced locations about the longitudinal axis of front drive shaft 61 to receive drive pins 68, respectively. Pins 68 protrude externally in a radial direction from the front drive shaft 61 and have inner ends flush with an internal surface of the second cylindrical portion of the front drive shaft 61 and rounded outer ends spaced from an external surface of the second cylindrical portion of drive shaft 61. The front drive shaft 61 including gear 63 is preferably made of stainless steel, and a proximal face of gear 63 is highly polished for smoothness.
Rear drive shaft 62, as illustrated in FIGS. 6 and 7, carries or is formed with a gear 69 and has a first cylindrical section of uniform external diameter extending proximally from gear 69 and a second cylindrical section of uniform external diameter, smaller than the external diameter of the first cylindrical section, extending proximally from the first cylindrical section in longitudinal or axial alignment therewith such that an external transverse shoulder 70 is defined at the junction of the first and second cylindrical sections. Gear 69 is similar to gear 63 and has a plurality of gear teeth 71 for mating with the gear teeth 65 in driving engagement. Rear drive shaft 62 has an open proximal end communicating with a longitudinal bore 72 extending distally from the open proximal end to terminate at a conical end surface in the second cylindrical section of the rear drive shaft. Opposed slots 73 are formed through the wall of the second cylindrical section of rear drive shaft 62 at 180° spaced locations about a longitudinal axis of the rear drive shaft. Slots 73 communicate with bore 72 and have open proximal ends communicating with the open proximal end of the rear drive shaft and arcuate distal edges disposed proximally of the conical end surface of bore 72. Slots 73 define a pair of opposed prongs 74 on rear drive shaft 62. Each slot 73 has a distal portion of substantially uniform width and an outwardly flared proximal portion of increasing width. Accordingly, each prong 74 terminates proximally at a triangular configured tip 75. Slots 73 have a width between parallel side edges of the prongs, and the width of the slots 73 is of a size to receive a drive pin of motor assembly 14 as explained further below. The parallel side edges of the prongs are parallel with the longitudinal axis of the rear drive shaft, and the walls forming the prongs are beveled interiorly along the tips 75. The rear drive shaft 62 including gear 69 is preferably made of stainless steel.
Front drive shaft 61 is disposed in the recess of the distal extension 51 of transfer body 49 with the proximal surface of gear 63 adjacent end wall 54 and with the front drive shaft extending into the neck 56 as shown in FIGS. 2 and 4. The bore 66 of front drive shaft 61 is axially aligned with the forward portion of passageway 57, which is disposed proximally of bore 66. A retaining ring 76, such as a stainless steel Smalley retaining ring of Smalley Steel Ring Co., Wheeling, Ill., is disposed on the second cylindrical portion of the front drive shaft 61 distally of external shoulder 64 and is secured in an internal groove or recess formed in the distal extension 51. A pair of radial shielded bearings 77 are mounted on the first cylindrical portion of front drive shaft 61, and a washer spring 78 is disposed around the front drive shaft 61 between retaining ring 76 and a distalmost bearing 77. A rotary seal 79 is disposed in an annular groove or recess extending proximally a short distance from end wall 54 in communication with the distal extension recess. Seal 79 is a two-part seal including an O-ring 79A and an annular seal ring 79B disposed between the O-ring 79A and the proximal surface of gear 63. The O-ring and seal ring are made of compressible materials; and, preferably, the O-ring 79A is made of 5-148 EPR and the seal ring 79B is made of mineral filled PTFE. The gear 63 is pre-loaded against seal 79 such that the proximal surface of gear 63 is in direct contact with the seal ring 79B and does not contact the end wall 54. Accordingly, there is a small gap or space between the proximal of gear 63 and the end wall 54 to eliminate metal to metal contact.
As shown in FIGS. 2 and 4, rear drive shaft 62 is disposed in the recess of proximal extension 52 with a distal surface of gear 69 spaced slightly from end wall 55 and with teeth 71 in driving engagement with teeth 65. Prongs 74 are disposed in the rearward recess section of the proximal extension 52. A pair of radial shielded bearings 77′ are mounted on the first cylindrical section of rear drive shaft 62. A retaining ring 76′, similar to retaining ring 76, is disposed around the second cylindrical section of rear drive shaft 62 proximally of external shoulder 70 and is fixedly secured in an internal groove or recess formed in the proximal extension 52. A washer spring 78′, similar to spring 78, is disposed around the rear drive shaft between a proximal most bearing 77′ and the retaining ring 76′.
Motor assembly 14, as shown in FIG. 2, includes an elongate, cylindrical motor housing 86, a motor 87, shown in FIG. 9, disposed within the housing 86 and an electrical connector 88 electrically connected with motor 87. Motor 87 includes a motor shaft 89 extending distally from a front end of motor housing 86 in longitudinal or axial alignment therewith. As shown in FIGS. 2 and 8, a pair of cylindrical drive pins 90 protrude from the motor shaft 89 in a radial direction at 180° spaced locations about a longitudinal axis of the motor shaft 89 for being received in slots 73 in driving engagement with prongs 74. As shown in FIG. 9, the motor housing 86 has a diametrically enlarged, open rear end with an internal thread for threaded connection to connector 88. Motor 87 is preferably a three-phase, brushless, DC motor having Hall Effect sensors, such as that of Harowe Servo Controls, Inc. of West Chester, Pa.
The motor 87 is powered by a software controlled power console via an electrical cord assembly 111 coupled with connector 88 and the power console as shown in FIG. 13. Cord assembly 111 comprises a length of shielded electrical cable or cord 113 having a first end carrying a first plug 115 for being coupled with electrical connector 88 and having a second end carrying a second plug P for being coupled to the power console. Cable 113 can be designed in many various ways and can include various types of shielded electric cable, such as that of W. L. Gore & Associates, Inc. of Phoenix, Ariz., having conductors for transmitting electricity from the power console PC to the motor 87. As shown in FIG. 14, plug 115 is designed as a male/female plug for being coupled with electrical connector 88 and has a cylindrical forward end with a planar end surface 117 for abutting base wall 94 of connector 88. A polarizing recess 119 corresponding to polarizing insert 95 is formed in the plug 115. A plurality of receptacles 121 are disposed in the plug 115 corresponding to pins 97 of electrical connector 88, and a plurality of pins 123 are disposed in the polarizing recess 119 corresponding to receptacles 98 of connector 88, the receptacles 121 and pins 123 being electrically connected with conductors of cable 113. Accordingly, the plug 115 can be plugged into the electrical connector 88 with the polarizing insert 95 of the connector received within the polarizing recess 119 of the plug with the pins 97 of the connector disposed within the receptacles 121 of the plug and the pins 123 of the plug disposed within the receptacles 98 of the connector. As shown in FIGS. 13 and 14, a locking or retaining ring 125 is concentrically disposed over the plug 115 and has an internal annular protrusion 127 disposed proximally of an annular abutment 129 of plug 115. The locking ring carries an internal seal 184 disposed proximally of protrusion 127 to keep out moisture. The locking ring 125, which is movable longitudinally relative to plug 115, is rotatable relative to plug 115 and is internally threaded along a distal end thereof for threaded engagement with the thread 83 of motor enclosure 20. Accordingly, a circumferential or annular gap or space is disposed between plug 1l5 and locking ring 125 for accommodating the proximal end of the motor enclosure 20 when the locking ring is threaded thereon. The cord assembly 111 is designed and constructed to be sterilized, such as via steam autoclave, for example, to medical standards for repeated use.
Once the motor assembly 14 has been properly installed in the handpiece body 12, the sterile plug 115 is plugged into the electrical connector 88 with a press fit with the locking ring 125 disposed in a proximal longitudinal position relative to plug 115 to allow the polarizing insert 95 to enter the polarizing recess 119 causing pins 97 of the electrical connector to enter the receptacles 121 of the plug and causing the pins 123 of the plug to enter the receptacles 98 of the connector. The locking ring 125 is then rotated in a first rotational direction relative to the plug 115 to threadedly engage the proximal end of the motor enclosure 20. As the locking ring 125 is threaded over the proximal end of the motor enclosure, the locking ring is moved longitudinally, distally relative to the plug 115 to a distal longitudinal position. The locking ring is rotated and, therefore, is moved longitudinally until the threads of the locking ring and the motor enclosure, respectively, are fully engaged. The proximal end of the motor enclosure 20 is then held between the plug 115 and the locking ring 125, with the locking ring 125 preventing withdrawal of the plug 115 from the connector 88 and, therefore, preventing withdrawal of the motor assembly 14 from the handpiece body 12. The plug P is plugged into the power console, which is utilized to supply electric power to motor 87 to rotate motor shaft 89, operation of the console being controlled by the surgeon such as via a foot switch or pedal for the console or directly from the console. Motor shaft 89 rotates rear drive shaft 62 which in turn rotates front drive shaft 61 via gears 63 and 69. Front drive shaft 61 in turn rotates a surgical blade drivingly engaged therewith to cut anatomical tissue. The front drive shaft 61 can be rotated via the motor assembly for full rotational movement along 360° continuously in the same direction and/or for oscillatory rotational movement in reverse directions along less than 360°.
FIG. 20 illustrates a surgical blade assembly 200 for use with the handpiece 10. Blade assembly 200 includes an outer blade 202, a hub 204 mounting a proximal end of the outer blade, an inner blade 206 for being disposed in the outer blade with the inner blade passing through hub 204, and a hub 208 mounting a proximal end of the inner blade. Outer blade 202 includes an elongate tubular member having an open proximal end and an open distal end or tip 210 carrying a cutting edge 212. As shown in FIG. 21, hub 204 for outer blade 202 includes a forward hub part 214 and a rearward hub part 216. Forward hub part 214 includes a distal cylindrical main body portion tapering to a smaller external diameter proximal cylindrical portion. A longitudinal passage 218 extends entirely through the forward hub part 214 and includes a forward passage section of uniform diameter, an intermediate passage section of uniform diameter greater than the diameter of the forward passage section, and a rearward passage section of uniform diameter greater than the diameter of the intermediate passage section. An internal transverse shoulder 220 is defined at the junction of the intermediate and rearward passage sections, and an annular seal 222 is disposed in the passage 218 in abutment with shoulder 220. An angular extension 224 protrudes angularly, proximally from the forward hub part 214 and has a longitudinal passage extending entirely therethrough in communication with the passage 218. Extension 224 has an open free end formed with a barb 226 for being coupled with an irrigation supply tube. Rearward hub part 216 includes a distal cylindrical section, a proximal cylindrical section having an external diameter greater than the diameter of the distal cylindrical section and an annular flange 228 disposed between the distal and proximal cylindrical sections. A longitudinal passage 230 of uniform diameter extends entirely through the rearward hub part 216. A plurality of partial spherical recesses 232 are formed along an outer forward edge or corner of flange 228 at 30° spaced locations about a longitudinal axis of rearward hub part 216. The rearward hub part 216 is assembled to the forward hub part 214 with the distal cylindrical section of the rearward hub 216 part secured in the rearward passage section of the forward hub part 214 with a distal end of the rearward hub part 216 in abutment with seal 222. The distal section of the rearward hub part can be secured in the rearward passage section of the forward hub part in many various ways, such as adhesively. With the rearward hub part 216 assembled to the forward hub part, the passages 218 and 230 are longitudinally or axially aligned to form a continuous longitudinal passage through hub 204. The open proximal end of the outer blade 202 is secured, such as adhesively, in the forward passage section of the forward hub part 214 with the lumen or internal passage of the outer blade 202 longitudinally or axially aligned with the passage through hub 204. A hole or aperture is formed in the outer blade 202 in alignment with the longitudinal passage of angular extension 224 to establish communication between the passage of the angular extension and the lumen of outer blade 202.
Inner blade 206 is illustrated in FIG. 22 and includes an elongate tubular member having an open proximal end 233 and an open distal end or tip 234 carrying a cutting edge 236 designed to cooperate with cutting edge 212 to cut anatomical tissue. Hub 208 for inner blade 206 includes a cylindrical body having a passage 238 extending longitudinally entirely therethrough. Passage 238 has a forward passage portion and a rearward passage portion larger in diameter than the forward passage portion. An internal transverse shoulder 240 is defined at the junction of the forward and rearward passage portions. As shown in FIGS. 22 and 23, a plurality of oblong slots 242 are formed in a proximal end of hub 208 at 90° spaced locations about a longitudinal axis of hub 208 with the slots 242 extending longitudinally, parallel to the longitudinal axis of hub 208 to define prongs 244. Each slot 242 has a distal portion of uniform width and a proximal portion of increasing width in the proximal direction. Accordingly, the proximal portions of slots 242 flare out from the distal portions thereof such that the prongs 244 have triangular shaped tips 246, the prongs 244 being similar to the prongs 74. The hub 208 and the prongs 244 are designed to be disposed in the handpiece 10 with the drive pins 68 of the front drive shaft 61 disposed in a pair of opposed slots 242 in driving engagement with prongs 244. An annular or cylindrical seal 248 is disposed within passage 238 at a proximal end of groove 249 along a forward surface thereof. A coil spring 250 is concentrically disposed in passage 238 and is mounted in compression between shoulder 240 and seal 248 with an end of the spring 250 being disposed in the groove 249. The open proximal end 233 of the inner blade 206 is disposed in the passage 238 to terminate proximally of seal 248 and is secured, such as adhesively, in passage 238 with the inner blade passing concentrically through spring 250. Preferably, the blades are made of stainless steel and the hubs are made of plastic, such as ABS resin, for disposability or single patient use.
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Classification606/170, 604/22International ClassificationA61B19/00, A61B17/32, A61M1/00Cooperative ClassificationA61B2217/005, A61B2217/007, A61B2090/0813, A61B17/32002, A61M1/008European ClassificationA61B17/32E2Legal EventsDateCodeEventDescriptionSep 29, 2004FPAYFee paymentYear of fee payment: 4Sep 18, 2008FPAYFee paymentYear of fee payment: 8Oct 2, 2012FPAYFee paymentYear of fee payment: 12RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services