US20040122435A1 - Bone alignment lever - Google Patents
Bone alignment lever Download PDFInfo
- Publication number
- US20040122435A1 US20040122435A1 US10/714,949 US71494903A US2004122435A1 US 20040122435 A1 US20040122435 A1 US 20040122435A1 US 71494903 A US71494903 A US 71494903A US 2004122435 A1 US2004122435 A1 US 2004122435A1
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- United States
- Prior art keywords
- retaining
- lever
- channel
- locking member
- shaft
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 210000000988 bone and bone Anatomy 0.000 title claims abstract description 98
- 210000000078 claw Anatomy 0.000 claims abstract description 58
- 230000006835 compression Effects 0.000 description 40
- 238000007906 compression Methods 0.000 description 40
- 210000000689 upper leg Anatomy 0.000 description 15
- 239000012634 fragment Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 229910001220 stainless steel Inorganic materials 0.000 description 5
- 239000010935 stainless steel Substances 0.000 description 5
- 238000004381 surface treatment Methods 0.000 description 4
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 210000000527 greater trochanter Anatomy 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001009 osteoporotic effect Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 229910000755 6061-T6 aluminium alloy Inorganic materials 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- 210000003484 anatomy Anatomy 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- 230000000881 depressing effect Effects 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 210000003414 extremity Anatomy 0.000 description 1
- 210000002414 leg Anatomy 0.000 description 1
- 210000000528 lesser trochanter Anatomy 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 210000002303 tibia Anatomy 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/88—Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices
- A61B17/8866—Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices for gripping or pushing bones, e.g. approximators
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/28—Surgical forceps
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/28—Surgical forceps
- A61B17/2812—Surgical forceps with a single pivotal connection
- A61B17/282—Jaws
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/88—Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices
- A61B17/8872—Instruments for putting said fixation devices against or away from the bone
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B2017/00367—Details of actuation of instruments, e.g. relations between pushing buttons, or the like, and activation of the tool, working tip, or the like
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/28—Surgical forceps
- A61B17/29—Forceps for use in minimally invasive surgery
- A61B2017/2926—Details of heads or jaws
- A61B2017/2932—Transmission of forces to jaw members
- A61B2017/2944—Translation of jaw members
Abstract
Description
- The present application is a continuation of the U.S. National Phase designation of co-pending International Patent Application No. PCT/JUSO2/16657, filed May 28, 2002, which is a continuation-in-part of co-pending U.S. patent application Ser. No. 09/865,507, filed May 29, 2001. The entire contents of both of these applications are expressly incorporated herein by reference thereto.
- The present invention relates to medical devices, and in particular, to medical devices for grasping and manipulating bones. More particularly, the present invention relates to a lever for grasping and manipulating the fragments of a fractured bone, for example, the proximal fragment of a fractured femur.
- Fractures of the proximal femoral shaft have proven difficult to manipulate in preparation for internal fixation. For example, when proximal shaft fractures of the femur occur, the distal end of the proximal fragment rotates anterior (flexion) and lateral (abduction) creating difficulty in accessing the piriformis fossa, the desired entry point for intramedullary nailing or other methods of internal fixation.
- Several devices for aligning fractured bones are described in the prior art. For example, U.S. Pat. No. 5,133,342 to Seaton and U.S. Pat. No. 5,733,291 to Guidera et al. describe bone alignment levers that are applied to the exterior of the patient's leg and maneuvered to align portions of a fractured bone. These external devices, however, do not provide adequate manipulation of the bone to rotate fractured bone portions such as the proximal femoral shaft back into proper alignment.
- Internal devices for aligning fractured bones are also described in the prior art. One example is U.S. Pat. No. 5,312,412 to Whipple, which describes a fixation alignment guide that includes an axially movable shaft having a bone engagement arm extending outwardly therefrom for engaging a fractured bone at a first surface location. A tubular guide through which the shaft is inserted includes jaws opposing the bone engagement arm for engaging the fractured bone at a second surface location. A ratchet mechanism and cooperating ratchet teeth are operatively associated with the guide for securing the bone engagement arm at a desired distance from the jaws to fixedly engage the fractured bone therebetween. The jaws and engagement arm are spaced apart laterally and define a large profile that requires a large incision for insertion into the patient. In addition, the ratchet mechanism and ratchet teeth only provide for incremental adjustment of the distance between the jaws and the engagement arm, and thus limit the user's ability to precisely adjust the amount of force applied to the bone.
- Another fixation alignment guide is described in U.S. Pat. No. 5,690,640 to Gotfried. This device includes a first hook for gripping the rear surface of the bone and a screw-threaded bar and handle which extend to the outside of the limb. A second hook for gripping a connector plate is movable on the bar. The two hooks are pulled together by a winged nut screwed onto the bar, thereby pressing the plate onto the bone. Similar to the Whipple device, discussed above, the two hooks require a large incision for insertion into the patient. Also, the speed at which the distance between the hooks can be adjusted is limited by the user's ability to quickly tighten or loosen the winged nut, thus limiting the ability to quickly apply or release the device in case of an emergency.
- Thus, there remains a need for a lever that provides adequate rotation of a bone, for example, the femur, requires a small incision for insertion into the patient, provides precise adjustment of the force applied to the bone, and may be quickly applied and removed from the bone.
- The present invention is directed to a lever for grasping bone tissue. The lever includes a shaft defining a channel, a claw member disposed on an end of the shaft for holding the bone tissue, and a rod threadably received in the channel. Rotation of the rod with respect to the shaft also causes the rod to move substantially axially with respect to the shaft to selectively position the distal end of the rod with respect to the claw member. The channel may include a first threaded portion and the rod may include a second threaded portion for threadably engaging the first threaded portion. The lever may include a bone engaging tip disposed on the distal end of the rod, which tip may be pointed, substantially concave, pivotable, or any other configuration known to one of ordinary skill in the art. The claw member may include a pair of spaced apart talons for grasping the bone tissue. The lever may further include an adjustment knob disposed on the rod. Additionally, a handle may be disposed on an end of the shaft.
- According to another embodiment of the invention, the lever includes a locking member defining a second channel substantially aligned with the first channel. The locking member is moveable between a first position wherein the rod is axially slidable in the first channel, and a second position wherein the rod is substantially prevented from axial sliding in the first channel. When the locking member is in the second position, the locking member threadably engages the rod such that rotation of the rod with respect to the shaft causes the rod to move substantially axially with respect to the shaft. The locking member may include a first threaded portion, the rod may include a second threaded portion, and the locking member may be resiliently biased toward the rod such that the first threaded portion engages the second threaded portion. Alternatively, the locking member may be rotatable with respect to the rod between the first and second positions such that when the locking member is in the first position the first threaded portion is disengaged from the second threaded portion, and when the locking member is in the second position the first threaded portion engages the second threaded portion. The lever may also include a retaining member for retaining the locking member in the second position.
- According to yet another embodiment of the present invention, the lever includes a handle portion and the claw member is removably and replaceably associated with the handle portion. The handle portion may include a shaft, and the claw member may be removably and replaceably associated with an end of the shaft. Alternatively, the claw member may include a shaft, and an end of the shaft may be removably and replaceably associated with the handle portion. The lever may further include a set of claw members, each of the claw members having different properties.
- The present invention is further directed to a method of using the lever to align first and second portions of a fractured bone. The method includes the steps of inserting at least a portion of the lever into an incision near the fractured bone, positioning the claw member around the first portion of the fractured bone, positioning the rod to engage the bone first portion between the rod and the claw member, and maneuvering the bone lever to align the first portion of the bone with the second portion of the bone. The method may also include the step of rotating the rod.
- The detailed description will be better understood in conjunction with the accompanying drawings, wherein like reference characters represent like elements, as follows:
- FIG. 1 is a perspective view of a bone lever according to the present invention, shown grasping a fractured femur;
- FIG. 2 is a perspective view of a first embodiment of the bone lever of FIG. 1;
- FIG. 3 is a cross-sectional view of the bone lever of FIG. 2;
- FIG. 4 is a top view of a first embodiment of a compression shaft of the bone lever of FIG. 2;
- FIG. 5 is a perspective view of a second embodiment of a bone lever according to the present invention;
- FIG. 6 is a side view of a first embodiment of a quick-release button of the bone lever of FIG. 5;
- FIG. 7 is a cross-sectional view of the quick-release button, taken along line VII-VII of FIG. 8;
- FIG. 8 is a front view of the quick-release button of FIG. 5;
- FIG. 9 is a side view of the bone lever of FIG. 5 with portions shown in phantom;
- FIG. 10 is a top view of the bone lever of FIG. 5;
- FIG. 11 is a cross-sectional view of the bone lever, taken along line XI-XI of FIG. 9;
- FIG. 12 is a perspective view of the bone lever of FIG. 5, including a second embodiment of a quick-release button;
- FIG. 13 is a cross-sectional view of the bone lever of FIG. 12;
- FIG. 14 is a perspective view of the quick-release button of FIG. 12;
- FIG. 15 is a front view of the quick-release button of FIG. 12;
- FIG. 16 is a cross-sectional view of the quick-release button, taken along line XVI-XVI of FIG. 15;
- FIG. 17 is a partially-exploded perspective view of a third embodiment of a bone lever according to the present invention;
- FIG. 17A is a partially-exploded perspective view of a variation of the bone lever of FIG. 17;
- FIG. 18 is a partially-exploded side view of the bone lever, with portions shown in cross-section;
- FIG. 19 is a perspective view of a retaining nut of FIG. 17;
- FIG. 20 is a cross-sectional view of the retaining nut of FIG. 19;
- FIG. 21 is a perspective view of a set of interchangeable claws for the bone lever of FIG. 17;
- FIG. 22 is a side view of the set of interchangeable claws of FIG. 21;
- FIG. 23 is a side view of a second embodiment of a compression shaft according to the present invention;
- FIG. 24 is a enlarged detail view of a bone engaging tip of the compression shaft of FIG. 23;
- FIG. 25 is a perspective view of a third embodiment of a compression shaft having a pivotable bone engaging tip, according to the present invention;
- FIG. 26 is an enlarged detail view of the bone engaging tip of FIG. 25;
- FIG. 27 is a side view of the compression shaft of FIG. 25, with the pivotable bone engaging tip removed;
- FIG. 28 is a enlarged cross-sectional view of an end of the compression shaft of FIG. 27;
- FIG. 29 is a perspective view of the pivotable bone engaging tip of FIG. 25;
- FIG. 30 is a side view of a fourth embodiment of a bone lever according to the present invention, shown with a retaining member in a non-retaining position;
- FIG. 31 is a side view of the bone lever of FIG. 30, shown with the retaining member in a retaining position;
- FIG. 32 is a perspective, detail view of a portion of the bone lever of FIG. 30;
- FIG. 33 is a perspective view of the retaining member of the bone lever of FIG. 30;
- FIG. 34 is a perspective view of the quick-release button of the bone lever of FIG. 30; and
- FIG. 35 is a top view of a portion of the handle of the bone lever of FIG. 30; shown with the retaining member in the retaining position.
- Referring to FIG. 1, a
bone lever 20 according to the present invention is shown grasping a portion of a fractured femur.Lever 20 is designed to pass through a percutaneous longitudinal incision in the area near the greater trochanter and grasp the proximal fragment of the fractured femur. Due to the streamlined configuration of thelever 20, the required incision is typically only four to six centimeters long and just deep enough to reach the area of the lessor trochanter, across the anterior aspect of the femur. Once inserted in the incision, thelever 20 can be manipulated to position and align the fractured fragments, for example, to align the medullary canal in preparation for intramedullary nailing. The present invention, however, is not to be limited to use with the femur, and may be used to manipulate and align any of the bones in the human and/or animal bodies. For example,lever 20 may alternatively be used on the tibia. - Referring to FIGS. 2 and 3, a first illustrative embodiment of a bone lever according to the present invention is shown as
lever 20.Lever 20 has aproximal end 22 and adistal end 24. Anelongated shaft 30 connects ahandle 40, located at theproximal end 22, to abone grappling claw 50, located at thedistal end 24.Handle 40 is sized to fit comfortably in the user's hand and may be provided with grooves, ridges, bumps, serrations, or any other surface treatment to increase a user's grip thereon. Whilehandle 40 is shown as being substantially cylindrical and oriented substantially coaxially withshaft 30, other configurations are within the scope of the present invention. For example, handle 40 may be shaped and contoured to match the anatomy of a human hand.Handle 40 may also be offset, angled, or curved with respect toshaft 30. -
Claw 50 includes a pair of spaced apart talons 52 that are curved to wrap around and grasp the femur. Eachtalon 52 includes a pointed tip 54 that assists in inserting theclaw 50 into the patient, and also increases grip on the femur.Claw 50 is not to be limited to the configuration shown, and may alternatively be, for example, offset or angled with respect toshaft 30.Shaft 30 is dimensioned such that an overall length L (shown in FIG. 3) oflever 20 is preferably between about 25 centimeters and about 50 centimeters, thus allowinglever 20 to act as a moment arm for imparting force to the femur.Shaft 30, handle 40 and claw 50 may be formed integrally, or may alternatively be formed separately and connected using various techniques known to one of ordinary skill in the art, such as, for example, welding, brazing, soldering, bonding, pinning, screwing or press fitting. In the case that these parts are formed separately,shaft 30 is preferably made of 300 series stainless steel, handle 40 is preferably made of 6061-T6 aluminum, and claw 50 is preferably made of 17-4 PH heat treated stainless steel, however, other suitable materials would be known to one of ordinary skill in the art. - As shown in FIG. 3,
shaft 30 and handle 40 define achannel 32 that may receive acompression rod 60.Compression rod 60, shown in FIG. 4, is an elongated rod that may include abone engaging tip 62 at one end, and anadjustment knob 64 located proximate thehandle 40.Bone engaging tip 62 is shown having a sharp point for engaging bone tissue, although other configurations as known by one of ordinary skill in the art are within the present invention.Adjustment knob 64 may be provided with grooves, ridges, bumps, serrations, or any other surface treatment to increase a user's grip thereon.Compression rod 60 further includes a threadedportion 66 that is received in anenlarged section 34 ofchannel 32. Threadedportion 66 is preferably a buttress screw thread, however, any type of thread known to one of ordinary skill in the art, such as an Acme thread or a Sharp-vee thread, may alternatively be used with the present invention.Compression rod 60 is preferably made of 17-4 PH heat treated stainless steel, however, other suitable materials as appropriate may alternatively be used. - Referring back to FIG. 3,
enlarged portion 34 ofchannel 32 includes a threadedportion 36 that engages threadedportion 66 ofcompression rod 60 such that rotation ofcompression rod 60moves compression rod 60 linearly with respect tochannel 32, thereby movingbone engaging tip 62 toward or away from the tips 54 oftalons 52. Thus, thedistal end 24 oflever 20 may be inserted into an incision in the patient with thetalons 52 oriented to grasp the anterior medial surface near the lesser trochanter, andadjustment knob 64 may be turned to advance thebone engaging tip 62 toward the area of the greater trochanter, thereby compressing and locking the fragment of the femur inclaw 50 between the talons 54 andbone engaging tip 62.Adjustment knob 64 may subsequently be turned in the opposite direction to release the femur fromclaw 50. - Referring to FIG. 5, a second illustrative embodiment of a bone lever is shown as
lever 120. In addition to the features oflever 20, discussed above,lever 120 includes a quick-release button 170 for disengaging and re-engaging the threaded connection betweencompression rod 160 and channel 132 (not shown). Sufficientlydepressing button 170 allows the user to freely slidecompression rod 160 in channel 132, thereby allowing rapid advancement ofbone engaging tip 162 toward or away fromtips 154 oftalons 152. The user might do this, for example, to rapidly position thebone engaging tip 162 ofcompression rod 160 in contact with the fractured fragment of the femur, or alternatively, to rapidly removebone engaging tip 162 from contact with the fragment. Oncebutton 170 is released,compression rod 160 is again threadably engaged in channel 132 (not shown), andadjustment knob 164 may be used to fine adjust the position ofbone engaging tip 162. - Referring to FIGS.6-8, quick-
release button 170 is shown, for example, as generally rectangular in shape and having a pair ofkeyways 172 formed in opposing sides thereof. A partially-threaded aperture 174 (shown in FIGS. 7 and 8) is formed throughbutton 170 and defines an elongated, almost circular cross-section substantially the same size as a cross-section of channel 132. It will be readily appreciated, however, that the present invention is not to be limited to the cross-sectional geometry ofaperture 174 shown and described.Aperture 174 includes a threadedportion 176 that corresponds to threadedportion 166 of compression rod 160 (not shown).Button 170 is preferably made of 304 series stainless steel, however, other suitable materials as suitable may be used. - As shown in FIGS.9-11,
button 170 is slidably received inslot 142, formed inhandle 140, withcompression rod 160 passing though partially-threadedaperture 174. A pair ofresilient members 144, shown as springs in FIG. 11,bias button 170 in direction D1, towards the opening inslot 142, such that threadedportion 176 engages threadedportion 166 ofcompression rod 160. Alternatively, as shown in FIG. 18, oneresilient member 344 may be used instead of two, however, any type, number and configuration of resilient members may be used with the present invention tobias button 170 in direction D1. A pair ofpins 146 preferably extend throughapertures 148 inhandle 140 and intokeyways 172, to retainbutton 170 inslot 142.Pins 146 are not required, however, andbutton 170 may alternatively be retained inslot 142 solely bycompression rod 160 passing through partially-threadedaperture 174. Whenbutton 170 is depressed in direction D2 against the force ofsprings 144, threadedportion 176 disengages threadedportion 166 andpermits compression rod 160 to slide freely in channel 132. Releasingbutton 170 returns threadedportion compression rod 160 from sliding freely in channel 132. - Referring to FIGS.12-16, a second embodiment of a quick release button is shown as
button 270. As shown in FIGS. 14-16,button 270 is shown, for example, as generally rectangular and includes a pair of opposing bosses 271 (shown in FIGS. 14 and 15) formed thereon. A throughhole 273 is formed throughbutton 270 and is aligned through both of thebosses 271. A partially-threadedaperture 274 is also formed inbutton 270, which has a slightly larger diameter than compression rod 260 (shown in FIG. 13) and includes upper and lower threadedportions aperture 274 defines alongitudinal axis 278 that is angularly disposed with respect tohorizontal axis 280 ofbutton 270 by anangle 282.Angle 282 is preferably about ten degrees, however, other angles may also be suitable as may be readily determined by one of ordinary skill in the art. - As shown in FIGS. 12 and 13,
button 270 is disposed inslot 242, formed inhandle 240, withcompression rod 260 passing though partially-threaded aperture 274 (shown in FIG. 13). A pair of dowel pins 246, shown in FIG. 12, extend throughelongated apertures 248 inhandle 240 and into opposite ends of throughhole 273 inbutton 270.Button 270 is thus retained inslot 242 and may rotate about dowel pins 246. Because theelongated apertures 248 are elongated with respect to the longitudinal axis oflever 220,button 270 may also slide inslot 242 along this longitudinal axis. Referring now to FIG. 13, because partially-threadedaperture 274 has a slightly larger diameter thancompression rod 260,button 270 may rotate through an angle corresponding toangle 282 with respect to dowelpins 246 between an engaged and a non-engaged position. In the engaged position, shown in FIG. 13, the upper and lower threadedportions aperture 274 are in threaded engagement with threadedportion 266 ofcompression rod 260. In the non-engaged position (not shown), however, upper and lower threadedportions portion 266, andcompression rod 260 is free to slide in channel 232. Thus, the user may rotatebutton 270 to the non-engaged position to provide for rapid advancement ofcompression rod 260 andbone engaging tip 262 toward or away from tips 254 ofclaw 250, or alternatively, rotatebutton 270 to the engaged position and rotateadjustment knob 262 to fine tune the position ofbone engaging tip 262. - Referring to FIGS. 17 and 18, a third illustrative embodiment of a bone lever is shown as
lever 320.Lever 320 is similar to the levers discussed above except thatclaw 350 is removably and replaceably associated withhandle 340. In the embodiment shown in FIG. 17,claw 350 may be removed from, and replaced on, the end ofshaft 330 by way of retainingnut 390.Claw 350 has akeyway 356 formed therein that receives a pair ofextensions 338 formed on the end ofshaft 330.Keyway 356 andextensions 338 cooperate to align and prevent rotation ofclaw 350 with respect to handle 340. Retainingnut 390 slides onshaft 330 and has a preferably has a reduced portion 392 (shown in FIGS. 20 and 21) that catches on ashoulder 339 formed on the end ofshaft 330 and prevents retainingnut 390 from sliding off the end ofshaft 330. Retainingnut 390 also has a threadedportion 394 formed on its inside surface that matches a threadedportion 358 formed onclaw 350. Alternatively, the configuration of retainingnut 390 and threadedportion 358 may be switched. Whenclaw 350 is aligned with the end ofshaft 330 withextensions 338 received inkeyway 356, retainingnut 390 may be threaded onto the threadedportion 358 ofclaw 350 to lockclaw 350 toshaft 330. To removeclaw 350 from the end ofshaft 330, for example to replace it with a different claw, the user simply has to turn retainingnut 390 sufficiently to disengage the threadedportions claw 350 shown in FIG. 17. For example, as shown in FIG. 17A,claw 350 andshaft 330 may be joined together and removably associated withhandle 340. Thus, one of ordinary skill in the art would appreciate thatclaw 350 and/orshaft 330 may be removably associated withhandle 340 at any number and combination of locations onlever 320. In addition, the present invention is not to be limited to the above-described structure for removing and replacingclaw 350 and/orshaft 330 onhandle 340, and various structures such as cams or quick-release pins may alternatively be used. - Referring to FIGS. 21 and 22, a set of six
different claws 350 a-f is shown, each claw having a different shape intended for a specific application.Claws talons 352 with sharply pointedtips 354.Claw 350 c, however, has a narrower width Wc thanclaw 350 a, and is therefore less invasive thanclaw 350 a.Claws broad blade 352 with aserrated tip 354. Once again, claw 350 d has a width Wd that is narrower than the width Wb ofclaw 350 b, and is therefore less invasive thanclaw 350 b.Claw 350 e has a pair of relatively long,narrow talons 352 e with sharply pointedtips 354 e, and claw 350 f has a single long, narrow talon 350 f with a sharply pointedtip 354 f. The present invention is not to be limited to the shape and configurations ofclaw 350 shown, and many other configurations may be suitable. For example, claw 350 may have three or more spaced apart talons.Claw 350 is preferably be made from 17-4 PH heat treated stainless steel, however, other suitable materials may be used. The above-described claws may be provided in a set with each claw having different properties, such as geometry, materials, etc. - Referring to FIGS. 23 and 34, a second embodiment of the compression shaft is shown. According to this embodiment of
compression shaft 460,bone engaging tip 462 is substantially concave or cup-shaped to be optimally suited for use with osteoporotic bone, which is usually soft and spongy.Bone engaging tip 462 resolves itself into the bone and forms a secure grip thereon. - Referring to FIGS. 25 and 26, a third embodiment of the compression shaft is shown.
Compression shaft 560 includes a pivotablebone engaging tip 562 that is suited for use with osteoporotic bone.Pivotable tip 562 defines a central bore 563 (shown in FIG. 29) that slides over a threaded boss 567 (shown in FIGS. 27 and 28) formed on the end of shaft 530. Central bore 563 is slightly oversized with respect to threadedboss 567 to allowpivotable tip 562 to pivot thereon. Afastener 568, such as a machine screw, may be threaded into threadedboss 567 to retainpivotable tip 562 on the end ofshaft 560.Pivotable tip 562 may alternatively be pivotally mounted to the end ofshaft 560 using various other structures such as, for example, a ball joint. As shown in FIG. 29, pivotable tip has a slightly concave bone-contactingsurface 569 that is provided with a surface treatment, such as serrations or teeth, that may dig into the bone and increase the frictional engagement between thetip 562 and the bone. The surface treatment is preferably in a star-grind pattern, as shown, however any number of configurations known to one of ordinary skill in the art may be suitable as well. All of the compression shafts described above may be used interchangeably with a bone lever as shown and described, thus permitting a single lever to be used with bones of different types and conditions. - Referring to FIGS. 30 and 31, a fourth illustrative embodiment of a bone lever is shown as
lever 620.Lever 620 is similar to the levers discussed above except that it includes a retainingmember 695 for retaining quick-release button 670 in a position wherebutton 670 engagescompression rod 660, e.g., where threaded portion 676 (best shown in FIG. 34) ofbutton 670 engages threaded portion 666 (not illustrated) ofcompression rod 660. Retainingmember 695 may be beneficial, for example, to prevent accidental depression ofbutton 670, or to increase the strength of engagement betweenbutton 670 andcompression rod 660. - Retaining
member 695 is movable between a non-retaining position, shown in FIG. 30, wherebutton 670 is depressible sufficiently to disengage the threaded connection betweencompression rod 660 andbutton 670, and a retaining position, shown in FIG. 31, where retainingmember 695 prevents movement ofbutton 670 sufficiently to prevent disengagement of the threaded connection betweencompression rod 660 andbutton 670. More specifically, as shown in FIG. 32, retainingmember 695 may be disposed in arecess 647 inhandle 640, and may slide in therecess 647 between the non-retaining position and the retaining position. One of ordinary skill in the art would appreciate, however, that retainingmember 695 is not limited to movement in a recess or to sliding, and may rotate, pivot, or employ any other type of movement between the non-retaining and retaining positions. Also, in the illustrative embodiment shown,recess 647 is located in an optionaltop plate 649 that is attached to handle 640, however,recess 647 may alternatively be formed directly in or onhandle 640. - When in the retaining position, a portion of retaining
member 695 may engage a portion ofbutton 670 to prevent movement of button 667. For example, as shown in FIGS. 33 and 34, retainingmember 695 may include an engagingportion 696, andbutton 670 may include achannel 679 configured and dimensioned to receive engagingportion 696. When engagingportion 696 is received inchannel 679, engagingportion 696 substantially prevents movement ofbutton 670, so as to prevent disengagement of the threaded connection betweencompression rod 660 andbutton 670. In the illustrative embodiment shown in FIGS. 33 and 34, engagingportion 696 andchannel 679 are shown as having substantially cylindrical shapes, however, one of ordinary skill in the art would appreciate that engagingportion 696 andchannel 679 may have any shapes, matching or non-matching, that allow engagingportion 696 to be received inchannel 679 and to substantially prevent movement ofbutton 670. One of ordinary skill in the art would also appreciate that many other structures known in the art may be implemented to engage retainingmember 695 withbutton 670. - Referring to FIG. 35,
channel 647 and retainingmember 695 may be configured and dimensioned to releasablyhold retaining member 695 in the retaining and/or non-retaining position. For example, at least one spring-biasedball 702 may be provided inchannel 647 for releasably engaging a detent 704 (shown in FIG. 33) provided on retainingmember 695. When retainingmember 695 is located in the retaining position,ball 702 engagesdetent 704 and releasably holds retainingmember 695 in the retaining position, i.e., increases the amount of force necessary to move retainingmember 695 out of the retaining position. Alternatively or additionally, retainingmember 695 may have a taperednose portion 706 that interacts withball 702 to releasablyhold retaining member 695 in the non-retaining position. As an alternative to having a taperednose portion 706, retaining member may be provided with a second set of detents that are positioned to releasably hold retainingmember 695 in the non-retaining position. Retainingmember 695 and/orball 702 may also be configured and dimensioned such that when retainingmember 695 is located between the retaining and the non-retaining positions,ball 702 provides friction against retainingmember 695 to provide a slight resistance against movement of retainingmember 695, thus preventing retainingmember 695 from freely sliding or rattling inchannel 647. One of ordinary skill in the art would appreciate thatdetent 704 may alternatively be provided onchannel 647 withball 702 provided on retainingmember 695. Furthermore, one of ordinary skill in the art would appreciate than any number of structures known in the art may be implemented to releasablyhold retaining member 695 in the retaining and/or non-retaining positions. - While various descriptions of the present invention are described above, it should be understood that the various features described can be used singly or in any combination thereof. Therefore, this invention is not to be limited to only the specifically preferred embodiments depicted herein and is further not limited to use with the femur.
- Further, it should be understood that variations and modifications within the spirit and scope of the invention may occur to those skilled in the art to which the invention pertains. Accordingly, all modifications attainable by one versed in the art from the disclosure set forth herein are to be included as further embodiments of the present invention. The scope of the present invention is accordingly defined as set forth in the appended claims.
Claims (27)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US10/714,949 US20040122435A1 (en) | 2001-05-29 | 2003-11-18 | Bone alignment lever |
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PCT/US2002/016657 WO2002096294A2 (en) | 2001-05-29 | 2002-05-28 | Bone alignment lever |
US10/714,949 US20040122435A1 (en) | 2001-05-29 | 2003-11-18 | Bone alignment lever |
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PCT/US2002/016657 Continuation WO2002096294A2 (en) | 2001-05-29 | 2002-05-28 | Bone alignment lever |
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US10/714,949 Abandoned US20040122435A1 (en) | 2001-05-29 | 2003-11-18 | Bone alignment lever |
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US09/865,507 Expired - Fee Related US6679888B2 (en) | 2001-05-29 | 2001-05-29 | Femur lever |
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EP (1) | EP1392188B1 (en) |
JP (1) | JP2004527339A (en) |
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CA (1) | CA2448751A1 (en) |
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Also Published As
Publication number | Publication date |
---|---|
DE60202948T2 (en) | 2006-03-16 |
PT1392188E (en) | 2005-06-30 |
DK1392188T3 (en) | 2005-05-23 |
US6679888B2 (en) | 2004-01-20 |
ATE288707T1 (en) | 2005-02-15 |
EP1392188B1 (en) | 2005-02-09 |
JP2004527339A (en) | 2004-09-09 |
US20020183759A1 (en) | 2002-12-05 |
BR0209784A (en) | 2004-06-01 |
DE60202948D1 (en) | 2005-03-17 |
WO2002096294A3 (en) | 2003-08-28 |
WO2002096294A2 (en) | 2002-12-05 |
ES2235049T3 (en) | 2005-07-01 |
MXPA03010956A (en) | 2004-02-27 |
EP1392188A2 (en) | 2004-03-03 |
AR043284A1 (en) | 2005-07-27 |
CA2448751A1 (en) | 2002-12-05 |
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