US20110307060A1 - Implant sensors - Google Patents
Implant sensors Download PDFInfo
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- US20110307060A1 US20110307060A1 US13/209,881 US201113209881A US2011307060A1 US 20110307060 A1 US20110307060 A1 US 20110307060A1 US 201113209881 A US201113209881 A US 201113209881A US 2011307060 A1 US2011307060 A1 US 2011307060A1
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- orthopedic implant
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
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- A61F2/3859—Femoral components
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- 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
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/72—Intramedullary pins, nails or other devices
- A61B17/7233—Intramedullary pins, nails or other devices with special means of locking the nail to the bone
- A61B17/7258—Intramedullary pins, nails or other devices with special means of locking the nail to the bone with laterally expanding parts, e.g. for gripping the bone
- A61B17/7275—Intramedullary pins, nails or other devices with special means of locking the nail to the bone with laterally expanding parts, e.g. for gripping the bone with expanding cylindrical parts
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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- A61B17/88—Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices
- A61B17/885—Tools for expanding or compacting bones or discs or cavities therein
- A61B17/8852—Tools for expanding or compacting bones or discs or cavities therein capable of being assembled or enlarged, or changing shape, inside the bone or disc
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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- A61F2002/30003—Material related properties of the prosthesis or of a coating on the prosthesis
- A61F2002/30004—Material related properties of the prosthesis or of a coating on the prosthesis the prosthesis being made from materials having different values of a given property at different locations within the same prosthesis
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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- A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30581—Special structural features of bone or joint prostheses not otherwise provided for having a pocket filled with fluid, e.g. liquid
- A61F2002/30583—Special structural features of bone or joint prostheses not otherwise provided for having a pocket filled with fluid, e.g. liquid filled with hardenable fluid, e.g. curable in-situ
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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- 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
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- Y10T442/30—Woven fabric [i.e., woven strand or strip material]
- Y10T442/3179—Woven fabric is characterized by a particular or differential weave other than fabric in which the strand denier or warp/weft pick count is specified
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Abstract
Exemplary orthopedic implants are disclosed. The orthopedic implants may include one or more sensors. Exemplary sensors include sensors to monitor bone growth, changes to the implant over time, and proper placement of the implant. The orthopedic implants may include a woven material. Sensor arrangements to detect a state of an item are disclosed. Exemplary states include folded, unfolded, and inflated. Exemplary items include an orthopedic implant and a parachute.
Description
- This application is a continuation of U.S. patent application Ser. No. 12/131,188, filed Jun. 2, 2008, titled IMPLANT SENSORS, docket ZIM0565, the disclosure of which is expressly incorporated by reference herein.
- The present invention relates generally to orthopedic implants and more particularly to orthopedic implants including one or more sensors,
- Orthopedic implants are known. Further, it is known to implement inflatable orthopedic implants and to implement orthopedic implants including a woven portion.
- The present invention relates to the use of one or more sensors with an orthopedic implant. The orthopedic implant may include one or more sensors for use during a surgical installation of the orthopedic implant. The orthopedic implant may include one or more sensors for use following a surgical installation of the orthopedic implant. The one or more sensors may include a passive sensor. The one or more sensors may include an active sensor.
- In an exemplary embodiment of the present disclosure, an orthopedic implant for placement in a cavity formed in a bone is provided. The cavity having a predetermined shape. The orthopedic implant comprising a flexible body having an opening. The flexible body having an inflated state wherein said body has an outer shape generally corresponding to said predetermined shape formed in said bone and a non-inflated shape wherein said outer shape has a smaller envelope than said inflated state. The implant further comprising a plurality of sensors supported by said flexible body, said plurality of sensors providing an indication of whether said flexible body is in said inflated state or said non-inflated state; and a fitter. The filler being positioned in said flexible body and causing said flexible body to transition from said non-inflated state to said inflated state.
- In another exemplary embodiment of the present disclosure, an orthopedic implant for placement in a cavity having a predetermined shape formed in a bone is provided. The orthopedic implant comprising a flexible body having an inflated shape generally corresponding to said predetermined shape formed in said bone; means for sensing said shape of said flexible body; and a filler. The filler being positioned in said flexible body.
- In a further exemplary embodiment of the present disclosure, a method of implanting an orthopedic implant in a cavity having a predetermined shape formed in a bone is provided. The method comprising the steps of providing a flexible body which is inflatable to a first state having an outer shape generally corresponding to said predetermined shape formed in said bone; positioning said flexible body in said cavity having said predetermined shape formed in said bone; inflating said flexible body; and sensing whether said flexible body is inflated to said first state.
- In yet another exemplary embodiment of the present disclosure, a system for monitoring wear of orthopedic implant for placement proximate a bearing surface when installed. in a body is provided. The system comprising an orthopedic implant body; a plurality of sensors supported by said orthopedic implant body and arranged to be positioned proximate said bearing surface, each sensor corresponding to a location on said orthopedic implant; and an interrogation system to interrogate said plurality of sensors subsequent to installation in said body. Each sensor of said plurality of sensors providing a first indication in response to an interrogation signal in an absence of wear of said orthopedic implant at said location corresponding to said sensor and a second indication in response to said interrogation signal in a presence of wear of said orthopedic implant at said location corresponding to said sensor.
- In a yet further exemplary embodiment of the present disclosure, a method of monitoring wear of an orthopedic implant placed proximate a bearing surface when installed in a body is provided. The method comprising the steps of providing a body of said orthopedic implant; providing a plurality of sensors supported by said orthopedic implant body and arranged to be positioned proximate said bearing surface, each sensor corresponding to a location on said orthopedic implant; and interrogating said plurality of sensors to determine if said orthopedic implant has experienced wear.
- In still a further exemplary embodiment of the present disclosure, a woven material for use within the body is provided. The woven material comprising a first woven layer having a first plurality of weft fibers and a first plurality of in layer warp fibers, said first layer having a first stiffness; a second woven layer having a second plurality of weft fibers and a second plurality of in layer warp fibers, said second layer having a second stiffness generally less than said first stiffness; a third woven layer having a third plurality of weft fibers and a third plurality of in layer warp fibers, said third layer having a third stiffness generally less than said. second stiffness; a first plurality of out of layer warp fibers which couple together said first layer and said second layer; and a second plurality of out of layer warp fibers which couple together said second layer and said third layer,
- In still another exemplary embodiment of the present disclosure, an orthopedic implant for positioning proximate a bone in a body is provided. The orthopedic implant comprising a first body portion including a three-dimensional woven material having a plurality of layers; and a second body portion coupled to said three-dimensional woven material. The three-dimensional woven material includes a first woven layer having a first plurality of weft fibers and a first plurality of in layer warp fibers. The first layer having a first stiffness. The orthopedic implant further comprising a second woven layer having a second plurality of well fibers and a second plurality of in layer warp fibers. The second layer having a second stiffness generally less than said first stiffness. The orthopedic implant further comprising a third woven layer having a third plurality of weft fibers and a third plurality of in layer warp fibers. The third layer having a third stiffness generally less than said second stiffness. The orthopedic implant further comprising a first plurality of out of layer warp fibers which couple together said first layer and said second layer and a second plurality of out of layer warp fibers which couple together said second layer and said third layer.
- In still a further exemplary embodiment of the present disclosure, an orthopedic implant for positioning proximate a bone in a body is provided. The orthopedic implant comprising a body portion including a three-dimensional woven material having a plurality of layers; and a plurality of sensors supported by said three-dimensional woven material. The plurality of sensors positioned proximate said bone and configured to provide an indication of a. presence of bone in-growth into said three-dimensional woven material.
- In still yet a further exemplary embodiment of the present disclosure, an orthopedic implant for positioning proximate a bone in a body. The orthopedic implant comprising a body portion including a three-dimensional woven material having a plurality of layers; and sensing means supported by said three-dimensional woven material, said sensing means being passive.
- In still yet another exemplary embodiment of the present disclosure, a method of measuring bone in-growth into an orthopedic implant placed proximate a bone when installed in a body is provided. The method comprising the steps of providing a body of said orthopedic implant, said body including a woven material; providing a sensor supported by said woven material and arranged to be positioned proximate said bone; and interrogating said sensor to determine if said bone has grown into said woven material, said sensor providing a first indication if bone in-growth is present.
- In another exemplary embodiment of the present disclosure, a method of measuring strain experienced by an orthopedic implant placed proximate a bone when installed in a body is provided. The method comprising the steps of providing a body of said orthopedic implant, said body including a woven material; providing a sensor supported by said woven material and arranged to be positioned proximate said bone; and interrogating said sensor to determine an amount of strain experienced by said orthopedic implant.
- In still another exemplary embodiment of the present disclosure, an assembly is provided. The assembly comprising a flexible body having a folded state and an unfolded state; and a plurality of sensors supported by said flexible body. The plurality of sensors providing an indication of whether said flexible body is in said folded state or said unfolded state.
- In yet another exemplary embodiment of the present disclosure, an assembly is provided. The assembly comprising a flexible body having a folded state and an unfolded state; and means for sensing whether said flexible body is in said folded state or said unfolded state.
- Additional features and advantages of the present invention will become apparent to those skilled in the art upon consideration of the following detailed description of illustrative embodiments exemplifying the best mode of carrying out the invention as presently perceived.
- The detailed description of the drawings particularly refers to the accompanying figures in which:
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FIG. 1 illustrates an inflatable orthopedic implant connected to a filler source; -
FIG. 2 illustrates a bone having a cavity bored therein; -
FIG. 3 illustrates a portion of the inflatable implant ofFIG. 1 inserted into the cavity ofFIG. 2 , the inflatable implant having a fold and including a plurality of sensors supported by the inflatable implant which may be interrogated by an external device; -
FIG. 4 illustrates the inflatable implant ofFIG. 3 with a filler material placed therein; -
FIG. 5 , illustrates the inflatable implant ofFIG. 4 having additional filler material placed therein, the inflatable implant being fully inflated; -
FIG. 6 illustrates a portion of the inflatable implant ofFIG. 1 inserted into the cavity ofFIG. 2 , the inflatable implant having a fold and including a plurality of optical sensors supported by the inflatable implant; -
FIG. 7 , illustrates the inflatable implant ofFIG. 6 having additional filler material placed therein, the inflatable implant being fully inflated; -
FIG. 8 is an exemplary embodiment of an inflatable implant for a hip stem having optical sensors, the inflatable implant being in a non-inflated state; -
FIG. 9A is a front view of the inflatable implant ofFIG. 8 fully inflated; -
FIG. 9B is a side view of the inflatable implant ofFIG. 8 fully inflated; -
FIG. 10 is a representation of a single layer woven material having a plurality of weft fibers and a plurality of warp fibers, each warp fiber floating over a plurality of weft fibers; -
FIG. 11 is a representation of a multi-layer three-dimensional woven material including a plurality of weft fibers, a plurality of in layer warp fibers, a plurality of out of layer warp fibers, and a plurality of straight warp fibers; -
FIG. 12 is a representation of the bones of a knee joint and an orthopedic implant coupled to a femur bone; -
FIG. 13 is a representative cross-section of the orthopedic implant ofFIG. 12 ; -
FIG. 14 is a representation of a resonant circuit which may be supported by an orthopedic implant as a sensor; -
FIG. 15 is a representation of a circuit which may be supported by an orthopedic implant as a sensor; -
FIG. 16 is a representation of the circuit ofFIG. 15 including a power source; -
FIG. 17 is a representation of the resonant circuit ofFIG. 14 wherein an antenna of the resonant circuit is wrapped around a fiber of a woven material of an orthopedic implant; -
FIG. 18 is a representation of an end view of an orthopedic implant having a plurality of sensors, each sensor corresponding to a location; -
FIG. 19 is a sectional view ofFIG. 18 illustrating sensors at various depths; -
FIG. 20 is the sectional view ofFIG. 19 illustrating sensors at various depths and a bone positioned proximate an upper surface of the orthopedic implant; and -
FIG. 21 is a representation of the sectional view ofFIG. 20 showing the wear of the orthopedic implant. - The embodiments of the invention described herein are not intended to be exhaustive or to limit the invention to the precise forms disclosed. Rather, the embodiments selected for description have been chosen to enable one skilled in the art to practice the invention.
- The present disclosure includes multiple uses of sensors in combination with orthopedic implants. Many types of orthopedic implants are known. Exemplary implants include implants to replace a portion of a hip joint and implants to replace portions of a knee joint. As used herein the term orthopedic implant is defined as a device for installation in a living body to provide structural support to at least a portion of the living body.
- Exemplary orthopedic implants for a hip joint, specifically hip stems and acetabular cups are provided in U.S. patent application Ser. No. 11/687,862, filed Mar. 19, 2007, assigned to the assignee of the present application. Exemplary surgical techniques to install hip stems and acetabular cups are described in U.S. Pat. No. 6,676,706, issued Jan. 13, 2004; U.S. Pat. No. 6,860,903, issued Mar. 1, 2005; U.S. Pat. No. 6,953,480, issued Oct. 11, 2005; U.S. Pat. No. 6,991,656, issued Jan. 31, 2006; abandoned U.S. patent application Ser. No. 10/929,736, filed Aug. 30, 2004; U.S. patent application Ser. No. 10/952,301, filed Sep. 28, 2004; U.S. patent application Ser. No. 11/235,286, filed Sep. 26, 2005; and U.S. patent application Ser. No. 11/105,080, filed Apr. 13, 2005, all titled METHOD AND APPARATUS FOR PERFORMING A MINIMALLY INVASIVE TOTAL HIP ARTHROPLASTY, all assigned to the assignee of the present application, the disclosures of which are hereby expressly incorporated herein by reference.
- One type of orthopedic implant is an inflatable
orthopedic implant 100. Referring toFIG. 1 , inflatableorthopedic implant 100 includes aflexible body 102.Flexible body 102 is sized to be placed in acavity 106 formed in abone 104.Cavity 106 is generally created during a surgical procedure by boring and/or other operations to remove bone material frombone 104.Cavity 106 has apredetermined shape 108. -
Flexible body 102 has an uninflated state and an inflated state. In the uninflated stated,flexible body 102 has an outer envelope smaller than the envelope offlexible body 102 in the inflated state.Flexible body 102 is inflated by introducing a filler material 113 (seeFIG. 4 ) from afiller source 112 through aconduit 110 into an interior offlexible body 102. In one embodiment, thefiller material 113 being under pressure to force it throughconduit 110 and intoflexible body 102. In one embodiment, thefiller material 113 is an expandable material which is placed inflexible body 102 and subsequently expands to causeflexible body 102 to inflate. Anexemplary filler material 113 is bone cement. The envelope offlexible body 102 in the inflated state generally corresponds to theshape 108 ofcavity 106 inbone 104 An exemplary inflatableorthopedic implant 100′ having aflexible body 102′ shaped for use as a portion of a hip stem is provided inFIGS. 8 , 9A, and 9B. Additional details regarding exemplary inflatable implants are provided in U.S. Pat. No. 6,425,923, issued Jul. 30, 2002, titled CONTOURABLE POLYMER FILLED IMPLANT, assigned to the assignee of the present disclosure, the disclosure of which is expressly incorporated by reference herein. - Referring to
FIG. 3 , a representation of a portion offlexible body 102 placed incavity 106 ofbone 104 is shown.Flexible body 102 includes afold 118 and is in the uninflated state because its shape does not generally correspond to shape 108 ofcavity 106. Referring toFIG. 4 ,flexible body 102 has been filled withfiller material 113. However, fold 118 is still present. Referring toFIG. 5 ,additional filler material 113 has been added causing the expansion offlexible body 102 and the removal offold 118. InFIG. 5 , the shape offlexible body 102 generally matchesshape 108 ofcavity 106. In one embodiment,flexible body 102 has a shape other than the shape ofcavity 106 when in the inflated state. - As shown in
FIGS. 3-5 ,flexible body 102 further supports a plurality ofsensors 120A-D which are used to determine whether flexible body is in the fully inflated state ofFIG. 5 , or a non-inflated state, such as inFIGS. 3 and 4 . Although foursensors 120A-D are represented,flexible body 102 may include any number of sensors.Sensors 120 are included to detect the presence offold 118 inflexible body 102. In one embodiment,sensors 120 are passive sensors which receive an excitation energy from an external source. In one embodiment,sensors 120 are active sensors having a power source coupled thereto. - In one embodiment,
sensors 120 areresonant circuits 122 which emit a signal of a respective frequency in response to receiving an excitation or interrogation signal of given frequency. The operation ofresonant circuits 122 are well known. Referring toFIG. 14 , a representation of aresonant circuit 122 is shown.Resonant circuit 122 includes anantenna 124 which receives aninterrogation signal 130 having a first frequency and emits in response thereto aresponse signal 132 having a second frequency. In one embodiment, the second frequency of theresponse signal 132 is the same as the first frequency of the excitation signal.Resonant circuit 122 includes acapacitive element 126 and aresistive element 128. In one embodiment,capacitive element 126 is comprised of multiple layers surrounding a fiber of a woven material,Resistive element 128 is shown to represent the parasitic resistance in the circuit. However, in one embodiment, a resistive element, such as a resistor, may be included to limit the frequency range ofcircuit 122 or shift the frequency of theresponse signal 132. Also, in one embodimentresistive element 128 may function as a sensor. The expected second frequency (such as equal to the first frequency) may be altered by changes in the amount of resistance in the circuit or the duration of the response signal may be altered. Changes in resistance may indicate a change in the tissue in contact withcircuit 122 or a strain or other force experienced bycircuit 122. - Returning to
FIG. 4 , aninterrogation system 150 is represented.Interrogation system 150 includes acontroller 152, atransmitter 154, and areceiver 156.Controller 152 includes a frequency sweep generator and causestransmitter 154 to emit a plurality of discrete interrogation signals 130A-130N across a frequency spectrum 158 (fA to fN). These interrogation signals 130 pass through the skin ortissue 160 of a livingbody 162. - Each of
sensors 120A-D is tuned to a respective interrogation frequency included infrequency spectrum 158. Each ofsensors 120A-D provides a respective response signal 132 at a discrete frequency in response to receiving the respective interrogation signal. These response signals 132 pass through the skin ortissue 160 of a livingbody 162. In one embodiment, the frequency of interrogation signals and response signals are generally around about 120 kHz. In one embodiment, the frequency of interrogation signals and response signals are generally in a range of about 120 kHz to less than 1 GHz. In one embodiment, the frequency of interrogation signals and response signals are generally in a range of about 120 kHz to less than 400 MHz. - Turning to
FIG. 5 ,flexible body 102 is in the inflated state and its shape generally matchesshape 108 ofcavity 106. In the inflated state,sensors 120A-D are spaced apart such that each responds tointerrogation device 150 separately. In response to aninterrogation signal 130A at a first frequency,sensor 120A emits aresponse signal 132A at generally the first frequency. In response to an interrogation signal 130B at a second frequency,sensor 120B emits aresponse signal 132B at generally the second frequency. In response to an interrogation signal 130C at a third frequency,sensor 120C emits aresponse signal 132C at generally the third frequency. In response to an interrogation signal 130D at a fourth frequency,sensor 120D emits aresponse signal 132D at generally the fourth frequency. If all four of theresponse signal 132A,response signal 132B,response signal 132C, andresponse signal 132D are received byreceiver 156 in response to the first frequency (interrogation signal 130A), the second frequency (interrogation signal 130A), the third frequency (interrogation signal 130A), and the fourth frequency (interrogation signal 130A), respectively,controller 152 determines thatfold 118 is not present and at least that portion offlexible body 102 is fully inflated. An active element may be used to change the response frequency or modulate the response signal, such as to include identification data. With a SAW (“a passive element” like an echo chamber) modulated signal, such as one including identification data, may be created without an active control element. - Returning to
FIG. 4 , iffold 118 inflexible body 102 is still present thensensors sensors individual sensors fold 118 in flexible body 102), the sensors act as a single sensor. As shown inFIG. 4 ,sensors response signal 132E at a fifth frequency instead of the two response signals, response signals 132B and 132C, at the second frequency and the third frequency. As such, if the fifth frequency (response signal 132E) is received byreceiver 156 or if one or both of the second frequency (response signal 132B) and the third frequency (response signal 132C) are not received byreceiver 156, thencontroller 152 determines thatfold 118 is present inflexible body 102 and at least that portion offlexible body 102 is not fully inflated. Further, ifcontroller 152 determines that the received signal at the second frequency (response signal 132B) and the third frequency (response signal 132C) are not at an amplitude above a threshold (due to the mutual inductance) thencontroller 152 may determine thatfold 118 is present. - in one embodiment,
inflatable implant 100 is inserted intocavity 106 formed inbone 104.Filler material 113 is provided to an interior offlexible body 102. As filler material is being provided to the interior offlexible body 102 or at discrete stop times during the filling offlexible body 102 withfiller material 113,interrogation system 150 interrogatesresonant circuits 122 to determine ifflexible body 102 is fully inflated. As discussed above, if all of the respective resonant circuits are providing theirunique response signal 132 thanflexible body 102 is fully inflated. In one embodiment, the location of eachresonant circuit 122 is mapped to its location onflexible body 102. As such, by knowing whichresonant circuits 122 are not providing theirunique response signal 132, an operator or a software application may determine the portion offlexible body 102 which is not fully inflated. - Although
flexible body 102 is described herein in connection with orthopedic implants, flexible body may be any component which may include a fold. Another exemplary flexible body is a parachute. Whenflexible body 102 is a parachute,sensors 120 may be used to provide an indication whether the parachute is properly folded or not based on the relative position ofsensors 120. - In one embodiment,
sensors 120A-D are optical sensors. In one embodiment,sensors 120A-D are diffraction gratings provided at discrete locations along anoptical fiber 166 which is coupled to or forms a part offlexible body 102. As is known, theshape 168 ofoptical fiber 166 may be determined by anoptical controller 170 based on the analysis of light interaction with the diffraction gratings. This shape sensing technology is available from Luna innovations located at 1 Riverside Circle, Suite 400, Roanoke, Va. 24016. Additional details regarding an exemplary optical system including diffraction gratings and the methods to determine a shape of the optical system are disclosed in U.S. Published patent application Ser. No. 11/535,438, filed Sep. 26, 2006, titled FIBER OPTIC POSITION AND SHAPE SENSING DEVICE AND METHOD RELATING THERETO, assigned to Luna Innovations incorporated, the disclosure of which is expressly incorporated by reference herein. - As shown in
FIG. 6 , theshape 168 ofoptical fiber 166 includes fold 118 offlexible body 102. The fold is shown on the display which provides an indication of the shape of theoptical fiber 166. As such, an operator or a software application may determine thatflexible body 102 is not fully inflated based on the shape of the optical fiber. Referring toFIG. 7 , theshape 168 ofoptical fiber 166 does not includefold 118 offlexible body 102. The fold is not shown on the display which provides an indication of the shape of theoptical fiber 166. As such, an operator or a software application may determine thatflexible body 102 is fully inflated based on the shape of the optical fiber. - in one embodiment,
inflatable implant 100 is inserted intocavity 106 formed inbone 104.Optical controller 170 is coupled to the one Or more optical fibers through acoupler 172 to provide one or more interrogation optical signal that interacts with the diffraction gratings inoptical fiber 166 and to receive one or more response optical signals back fromoptical fiber 166 which are used to determine theshape 168 ofoptical fiber 166.Filler material 113 is provided to an interior offlexible body 102. As filler material is being provided to the interior offlexible body 102 or at discrete stop times during the filling offlexible body 102 withfiller material 113, theshape 168 of the one or moreoptical fibers 166 is determined. Theshape 168 of theoptical fiber 166 provides the shape offlexible body 102 and thus an indication of whetherflexible body 102 is fully inflated or not. Onceflexible body 102 is frilly inflated,optical controller 168 is uncoupled from the installedimplant 100. - Referring to
FIG. 8 , an exemplary embodiment of aninflatable implant 100′ including aflexible body 102′ in a non-inflated state is shown. The positions of one or moreoptical fibers 166 are illustrated by dashed lines. Referring toFIGS. 9A and 9B , the same embodiment offlexible body 102′ is shown in a frilly inflated state. Again, the positions of the one or moreoptical fibers 166 are illustrated by dashed lines. It is this layout ofoptical fibers 166 that an operator or software application would recognize as an indication thatflexible body 102 is in the fully inflated state. - Returning to
FIGS. 8 , 9A, and 9B, in one embodiment theoptical fibers 166 are replaced with one or more fibers which are marginally conductive. The resistively of the fibers are monitored. In one embodiment, the conductivity of the fibers is at a first value whenimplant 100 is fully inflated. In one embodiment, the first value is a minimum value. - In one embodiment,
flexible body 102′ is made of awoven material 180. Referring toFIG. 10 , wovenmaterial 180 includes asingle layer fabric 182 including a plurality of well fibers 184 and a plurality ofwarp fibers 186.Optical fibers 166 may replace one ofweft fibers 182 and warp fibers 184 and form part of wovenmaterial 180. As illustratedwarp fibers 186 are floated over four weft fiber 184 to reduce the amount of bending ofoptical fibers 166. Thewarp fibers 186 which correspond tooptical fibers 166 may be floated over more or less weft fibers 184. In one embodiment, thewarp fibers 186 which correspond tooptical fibers 166 are floated over at least two of the weft fibers 184. -
Woven material 180 may be made from any type of bio-compatible material which results in a flexible body having a non-inflated state and an inflated state. Exemplary materials include polymers, such as thermoplastics and hydrophilic hydrogels; bio-degradable materials; acrylics; natural fibers; metals; glass fibers; carbon fibers; ceramics; and other suitable materials. Exemplary polymers include propylene, polyester, high density polyethylene (HDPE), low densitypolyethylene (LDPE), ultra-high molecular weight polyethylene (UHMWPE), polycarbonate urethane, polyetheretherketones (PEEK). Exemplary hydrophilic hydrogel include polyvinyl alcohol (PVA), polyvinylpyrrolidone (PVP), and polyethylene glycol (PEG). Exemplary bio-degradable materials include Polylactic Acid (PLA), poly-L-lactide (PLLA) and polyglycolic acid (PGA). Exemplary acrylics include polymethyl methacrylate (PMMA). Exemplary natural fibers include elasin, keratin, silk, hydroxyl apatite (HA), collagen, and chitosan. Exemplary metals include stainless steel, titanium, titanium alloys, cobalt, nickel titanium alloy (nitinol), and tantalum. Exemplary ceramics include zirconia, alumina, and silica. - Further,
inflatable implant 100′ may be made from a three-dimensionalwoven material 200. Referring toFIG. 11 , three-dimensionalwoven material 200 is shown. In one embodiment, three-dimensionalwoven material 200 includes fibers which make a generally rigid. body for use as an orthopedic implant. In one embodiment, three-dimensionalwoven material 200 includes fibers which make a generallyflexible body 102 for an inflatableorthopedic implant 100. - Referring to
FIG. 11 , a portion of a three-dimensionalwoven material 200 is shown. Three-dimensionalwoven material 200 includes a plurality of well fibers 202 (extending out of the page), a plurality of inlayer warp fibers 204, and a plurality of out oflayer warp fibers 206. In the illustrated embodiment, three-dimensionalwoven material 200 also includes a. plurality ofstraight warp fibers 208. - In the illustrated embodiment, three-dimensional
woven material 200 includes fivelayers layers layer warp fibers 206. Although five layers are shown, three-dimensionalwoven material 200 may include between two and five layers or more than five layers. Further, although out oflayer warp fibers 206 are shown coupling two adjacent layers together, the out oflayer warp fibers 206 may couple more than two layers together. - Each of
weft fibers 202, inlayer warp fibers 204, out oflayer warp fibers 206, andstraight warp fibers 208 may be made of one or more materials. In the case of multiple materials, the respective fiber may be a braided fiber. Exemplary materials include polymers, such as thermoplastics and hydrophilic hydrogels; bio-degradable materials; acrylics; natural fibers; metals; glass fibers; carbon fibers; ceramics; and other suitable materials. Exemplary polymers include propylene, polyester, high density polyethylene (HDPE), low density polyethylene (LDPE), ultra-high molecular weight polyethylene (UHMWPE), polycarbonate urethane, polyetheretherketones (PEEK). Exemplary hydrophilic hydrogel include polyvinyl alcohol (PVA), polyvinylpyrrolidone (PVP), and polyethylene glycol (PEG). Exemplary bio-degradable materials include Polylactic Acid (PLA), poly-L-lactide (PLLA) and polyglycolic acid (PGA). Exemplary acrylics include polymethyl methacrylate (PMMA). Exemplary natural fibers include elasin, keratin, silk, hydroxyl apatite (HA), collagen, and chitosan. Exemplary metals include stainless steel, titanium, titanium alloys, cobalt, nickel titanium alloy (nitinol), and tantalum. Exemplary ceramics include zirconia, alumina, and silica. - In one embodiment, three-dimensional
woven material 200 is a gradient woven material. A gradient woven material is defined as a material which includes a first layer of a first stiffness, a second layer of a second stiffness, and one or more layers between the first layer and the second layer having a stiffness between the first stiffness and the second stiffness. In one embodiment, the first layer is a first end layer of the a woven material and the second layer is a second end layer of the woven material. In one embodiment, the gradient woven material includes at least one of the end layers of the overall woven material. In one embodiment, the gradient woven material is interposed between additional layers of a woven material. - The first layer, the second layer, and the interposed layers may include a single material or multiple materials. Further, the out of
layer warp fiber 206 may have a stiffness generally the same as the layer it is woven in or a stiffness generally the same as the layer which it couples to the layer it is woven in. - An exemplary gradient material will be presented with reference to
FIG. 11 . In general layers made of metallic fibers are stiffer than layers made of ceramic fibers, layers made of ceramic fibers are stiffer than layers made of thermoplastic fibers, layers made of thermoplastic fibers are stiffer than layers made of hydrophilic hydrogels. -
Layer 210 of three-dimensionalwoven material 200 includes a plurality ofweft fibers 202A, a plurality of in layer warp fibers 204A, and a plurality of out of layer warp fibers 206A. The plurality ofweft fibers 202A, and the plurality of in layer warp fibers 204A are metallic fibers and providelayer 210 with generally a first stiffness. -
Layer 212 of three-dimensionalwoven material 200 includes a plurality of weft fibers 202B, a plurality of in layer warp fibers 204B, and a plurality of out of layer warp fibers 206B. The plurality of weft fibers 202B and the plurality of in layer warp fibers 204B are approximately fifty percent metallic fibers and approximately fifty percent thermoplastic fibers and providelayer 212 with generally a second stiffness, lower than the first stiffness oflayer 210. In one embodiment, all of the weft fibers 202B are one of metallic fibers and thermoplastic fibers and all of the in layer warp fibers are the other of metallic fibers and thermoplastic fibers. In one embodiment, at least one of weft fibers 202B and in layer warp fibers 204B are a blend of metallic fibers and thermoplastic fibers. The plurality of out of layer warp fibers 206A oflayer 210 may either be metallic fibers (similar to layer 210) or a blend of metallic and thermoplastic fibers (similar to layer 212). -
Layer 214 of three-dimensionalwoven material 200 includes a plurality ofweft fibers 202C, a plurality of in layer warp fibers 204C, and a plurality of out of layer warp fibers 206C. The plurality ofweft fibers 202C and the plurality of in layer warp fibers 204C are generally thermoplastic fibers and providelayer 212 with generally a third stiffness, lower than the second stiffness oflayer 212. The plurality of out of layer warp fibers 206B oflayer 212 may either be thermoplastic fibers (similar to layer 214) or a blend of metallic and thermoplastic fibers (similar to layer 212). -
Layer 216 of three-dimensionalwoven material 200 includes a plurality ofweft fibers 202D, a plurality of inlayer warp fibers 204D, and a plurality of out oflayer warp fibers 206D. The plurality ofweft fibers 202D and the plurality of inlayer warp fibers 204D are approximately fifty percent hydrophilic hydrogel fibers and approximately fifty percent thermoplastic fibers and providelayer 216 with generally a fourth stiffness, lower than the third stiffness oflayer 214. In one embodiment, all of theweft fibers 202D are one of hydrophilic hydrogel fibers and thermoplastic fibers and all of the in layer warp fibers are the other of hydrophilic hydrogel fibers and thermoplastic fibers. In one embodiment, at least one ofweft fibers 202D and inlayer warp fibers 204D are a blend of hydrophilic hydrogel fibers and. thermoplastic fibers. The plurality of out of layer warp fibers 206C oflayer 214 may either be thermoplastic fibers (similar to layer 214) or a blend of hydrophilic hydrogel fibers and thermoplastic fibers (similar to layer 216). -
Layer 218 of three-dimensionalwoven material 200 includes a plurality ofweft fibers 202E and a plurality of inlayer warp fibers 204E. The plurality ofweft fibers 202E and the plurality of inlayer warp fibers 204E are generally hydrophilic hydrogel fibers and providelayer 218 with generally a fifth stiffness, lower than the fourth stiffness oflayer 216. The plurality of out oflayer warp fibers 206D oflayer 216 may either be hydrophilic hydrogel fibers (similar to layer 218) or a blend of hydrophilic hydrogel fibers and thermoplastic fibers (similar to layer 216). -
Straight warp fibers 208A are provided generally betweenlayers Straight warp fibers 208A may be made from fibers having the same materials aslayer 210 or the same materials aslayer 212. In a similar fashionstraight warp fibers 208B are provided generally betweenlayers straight warp fibers 208C are provided generally betweenlayers straight warp fibers 208D are provided generally betweenlayers - Any given
straight warp fiber 208,weft fiber 202, inlayer warp fiber 204, and outlayer warp fiber 206, may be replaced with one or more sensors, such as anoptical fiber 166 including optical sensors. Further, any givenstraight warp fiber 208,weft fiber 202, inlayer warp fiber 204, and outlayer warp fiber 206, may support on or more sensors. Exemplary supported sensors include resonant circuits with digital identifiers (seeFIG. 15 ) andresonant circuits 122. - In one embodiment, a three-dimensional
woven material 246 forms a portion of anorthopedic implant 250.Implant 250 is coupled to afemur bone 249 of aknee joint 248.Woven material 246 includes afirst layer 252 positionedadjacent bone 249, asecond layer 254, and athird layer 256.Third layer 256 may act as abearing surface 258. In one embodiment,third layer 256 is coated with a resin, epoxy, or a biological gel to form bearingsurface 258. In one embodiment, the polymer fibers of thethird layer 256 form thebearing surface 258. In one embodiment,first layer 252 includes metallic fibers,third layer 256 includes polymer fibers, andsecond layer 254 is a transitional layer, such as thermoplastic fibers and/or ceramic fibers. In one embodiment, at least one offirst layer 252,second layer 254, andthird layer 256 support one or more sensors. An exemplary sensor supported byfirst layer 252 would be a bone in-growth sensor. - Exemplary bone in-growth sensors include
resonant circuits 122. Turning toFIG. 14 , to measure bone-in growth, aregion 125 between the capacitive plates ofcapacitor 126 is aligned with a region of expected bone in-growth. As bone grows intoregion 125, the dielectric constant ofcapacitor 125 changes which alters the frequency of theresponse signal 132 provided byresonant circuit 122. It should be noted thatcapacitor 126 does not need to be two plates separated by a dielectric. In one embodiment, a first portion ofcapacitor 126 may be positioned side-by-side to, but separated from, a second portion ofcapacitor 126. Changes in the dielectric material adjacent the first portion and the second portion would cause a change in the capacitance ofcapacitor 126. - Although
capacitor 126 is described as the mechanism to measure bone in-growth, eitherresistor 128 orinductor 124 may be used instead. Changes to the inductor would result in a change in the inductance of the circuit which would have an effect on the response signal. Changes to the resistance would result to changes in the response signal, such as howtong circuit 122 rings (dampen out quickly”). - A resonant circuit with a digital identifier 260 (see
FIG. 15 ) may also be used as a bone in-growth sensor.Resonant circuit 260 may also monitor the dielectric constant ofcapacitor 126. However, unlikeresonant circuit 122, resonant circuit can send a signal with a unique identifier identifying itself and an indication of the dielectric constant ofcapacitor 126. The unique identifier and the message packet forsignal 132 are controlled by a controller orprocessor 262 powered by the receivedsignal 130. In one embodiment,controller 262 is a passive device like a surface acoustic wave (SAW) device which burst back a modulated signal, unique identifier. In this case all resonant circuits may be tuned to the same excitation frequency and the SAW device of each circuit would burst back a modulated signal at a particular frequency. The SAW device includes a converter to generate DC energy to power the logic of the controller and then provide response signal. The response can be sent out with the same antenna (between excitation signals) or a different antenna. In one embodiment, a resonant circuit includes a controller which includes an active device, like a mixed-signal application specific integrated circuits (ASIC). The inclusion of a mixed signal ASIC results in a semi-passive device. - Another resonant circuit is shown in
FIG. 16 which includes alocal power source 264 forcontroller 262 which either supplements the power from the received signal or provides power for intermittent readings of strain or bone in-growth. An exemplary power source is a battery. Another exemplary local power source includes a piezoelectric member. It is believed that another potential local power may be a plurality of zinc oxide nanowires discussed in more detail in “Piezoelectric Nanogenerators Based on Zinc oxide Nanowire Arrays,” Science, Apr. 14, 2006. In one embodiment, the local power source may scavenge energy from the received. excitation signal. - An exemplary sensor supported by one of
first layer 252,second layer 254, and.third layer 256 is a strain sensor. Exemplary strain sensors includeresonant circuits 122. Referring toFIG. 17 , aresonant circuit 122 is shown wherein theantenna 124 is wrapped around aweft fiber 202. Asweft fiber 202 is compressed or stretched along its length, the frequency response ofresonant circuit 122 is altered. In one embodiment, a resistive element ofcircuit 122 is wrapped around awelt fiber 202 and changes in the resistance ofcircuit 122 provides an indication of the strain on the fiber. In one embodiment, a capacitive element ofcircuit 122 is wrapped around aweft fiber 202 and changes in the capacitance ofcircuit 122 provides an indication of the strain on the fiber. - Referring to
FIGS. 18-21 , an end view of a portion of anorthopedic implant 300 is shown.Implant 300 may be a part of a knee joint 248, likeimplant 250. Over time it is possible forimplant 300 to experience wear due to the forces exerted thereon.Orthopedic implant 300 may be made of a woven material and/or other materials. -
Implant 300 includes a plurality ofsensors 302A-E (sensor 302E shown inFIG. 19 ) which provide an indication of wear of theorthopedic implant 300. In oneembodiment sensors 302A-E areresonant circuits 122. In one embodiment,sensors 302A-E are RFID tags 260. The location of each sensor is mapped to a location on the implant. As such, once interrogated each sensor then provides an indication of wear at that location. As shown inFIG. 19 ,sensor 302E is at a deeper depth thansensors - In one embodiment, sensors 302&-E are
resonant circuits 122 and are interrogated byinterrogation system 150. Eachresonant circuit 122 provides aresponse signal 132 in response to itsrespective interrogation signal 130. If all sensors provide aresponse signal 132 thanimplant 300 has not experienced any appreciable wear. This is shown inFIG. 20 wherein abone 310 is resting uponimplant 300. - Referring to
FIG. 21 bone 310 (or other items) has over time worn portions ofimplant 300. As illustrated inFIG. 21 ,bone 310 has destroyedsensor 302A. Upon thenext interrogation sensor 302A will not respond. An operator or software application based on a knowledge of the location ofsensors 302A is able to determine thatimplant 300 is worn in the area ofsensor 302A. However, sincesensor 302E still provides a signal in response to the interrogation, it is known that the wear ofimplant 300 has not reached the depth ofsensor 302E. - Although the invention has been described in detail with reference to certain preferred embodiments, variations and modifications exist within the spirit and scope of the invention as described and defined in the following claims.
Claims (34)
1. An orthopedic implant for placement in a cavity formed in a bone, said cavity having a predetermined shape, said orthopedic implant comprising:
a flexible body having an opening, said flexible body having an inflated state wherein said body has an outer shape generally corresponding to said predetermined shape formed in said bone and a non-inflated shape wherein said outer shape has a smaller envelope than said inflated state;
a plurality of sensors supported by said flexible body, said plurality of sensors providing an indication of whether said flexible body is in said inflated state or said non-inflated state; and
a filler, said filler being positioned in said flexible body and causing said flexible body to transition from said non-inflated state to said inflated state, wherein said plurality of sensors include a plurality of optical sensors.
2. The orthopedic implant of claim 1 , wherein said plurality of sensors include a plurality of optical sensors.
3. The orthopedic implant of claim 2 , wherein said plurality of optical sensors are in optical communication with an external detector through an optical fiber.
4. The orthopedic implant of claim 3 , wherein said plurality of optical sensors are a plurality of diffraction gratings disposed in said optical fiber, said optical fiber having a first shape indicating said presence of said fold wherein said plurality of diffraction gratings are in a first plurality of locations and a second shape indicating said absence of said fold wherein said plurality of diffraction gratings are in a second plurality of locations.
5. A system for monitoring wear of orthopedic implant for placement proximate a bearing surface when installed in a body, said system comprising:
an orthopedic implant body;
a plurality of sensors supported by said orthopedic implant body and arranged to be positioned proximate said bearing surface, each sensor corresponding to a location on said orthopedic implant; and
an interrogation system to interrogate said plurality of sensors subsequent to installation in said body, each sensor of said plurality of sensors providing a first indication in response to an interrogation signal in an absence of wear of said orthopedic implant at said location corresponding to said sensor and a second indication in response to said interrogation signal in a presence of wear of said orthopedic implant at said location corresponding to said sensor.
6. The system of claim 5 , wherein said first indication is a response signal and said second indication is the lack of said response signal.
7. The system of claim 6 , wherein each sensor includes a controller and said response signal includes a unique identifier.
8. The system of claim 6 , wherein each sensor is a resonant circuit and said response signal is at a unique frequency.
9. The system of claim 6 , wherein said body includes a three-dimensional woven component.
10. The system of claim 9 , wherein said three-dimensional woven component includes a plurality of materials which form a gradient woven material.
11. A method of monitoring wear of an orthopedic implant placed proximate a bearing surface when installed in a body, said method comprising the steps of
providing a body of said orthopedic implant;
providing a plurality of sensors supported by said orthopedic implant body and arranged to be positioned proximate said bearing surface, each sensor corresponding to a location on said orthopedic implant; and
interrogating said plurality of sensors to determine if said orthopedic implant has experienced wear.
12. The method of 11, wherein each sensor of said plurality of sensors provides a first indication in response to an interrogation signal in said absence of wear of said orthopedic implant at said location corresponding to said sensor and a second indication in response to said interrogation signal in said presence of wear of said orthopedic implant at said location corresponding to said sensor.
13. The method of claim 12 , wherein said step of interrogating said plurality of sensors to determine if said orthopedic implant has experienced wear includes the steps of:
positioning an external interrogation system proximate to said orthopedic implant; and
for a respective sensor
passing said interrogation signal through said body;
receiving from said respective sensor one of said first indication and said second indication.
14. An orthopedic implant for positioning proximate a bone in a body, said orthopedic implant comprising:
a first body portion including a three-dimensional woven material having a plurality of layers; and
a second body portion coupled to said three-dimensional woven material, wherein said three-dimensional woven material includes a first woven layer having a first plurality of weft fibers and a first plurality of in layer warp fibers, said first layer having a first stiffness; a second woven layer having a second plurality of weft fibers and a second plurality of in layer warp fibers, said second layer having a second stiffness generally less than said first stiffness; a third woven layer having a third plurality of weft fibers and a third plurality of in layer warp fibers, said third layer having a third stiffness generally less than said second stiffness; a first plurality of out of layer warp fibers which couple together said first layer and said second layer; and a second plurality of out of layer warp fibers which couple together said second layer and said third layer.
15. The orthopedic implant of claim 14 , further comprising a plurality of sensors supported by said three-dimensional woven material, said plurality of sensors positioned proximate said bone and configured to provide an indication of a presence of bone in-growth into said three-dimensional woven material.
16. The orthopedic implant of claim 14 , further comprising a plurality of sensors supported by said three-dimensional woven material, said plurality of sensors positioned proximate said bone and configured to provide an indication of a strain experience by said three-dimensional woven material.
17. An orthopedic implant for positioning proximate a bone in a body, said orthopedic implant comprising:
a body portion including a three-dimensional woven material having a plurality of layers; and
a plurality of sensors supported by said three-dimensional woven material, said plurality of sensors positioned proximate said bone and configured to provide an indication of a presence of bone in-growth into said three-dimensional woven material.
18. The orthopedic implant of claim 17 , wherein said plurality of sensors each include a capacitive element having a first dielectric value, said presence of said bone in-growth into said three-dimensional woven material changing said first dielectric value.
19. The orthopedic implant of claim 18 , wherein said capacitive element is operatively coupled to an antenna which broadcasts a signal having a frequency based at least in part on said first dielectric value, said antenna broadcasting at a first frequency in said absence of bone in-growth into said three-dimensional woven material and at a second frequency in said presence of bone in-growth into said three-dimensional woven material.
20. An orthopedic implant for positioning proximate a bone in a body, said orthopedic implant comprising:
a body portion including a three-dimensional woven material having a plurality of layers; and
sensing means supported by said three-dimensional woven material, said sensing means being passive.
21. A method of measuring bone in-growth into an orthopedic implant placed proximate a bone when installed in a body, said method comprising the steps of:
providing a body of said orthopedic implant, said body including a woven material;
providing a sensor supported by said woven material and arranged to be positioned proximate said bone; and
interrogating said sensor to determine if said bone has grown into said woven material, said sensor providing a first indication if bone in-growth is present.
22. The method of claim 21 , wherein said sensor in response to interrogation provides a signal of a first frequency in said absence of said presence of bone in-growth and a signal of a second, different frequency in said presence of bone in-growth, said second, different frequency being said first indication.
23. A method of measuring strain experienced by an orthopedic implant placed proximate a bone when installed in a body, said method comprising the steps of:
providing a body of said orthopedic implant, said body including a woven material;
providing a sensor supported by said woven material and arranged to be positioned proximate said bone; and
interrogating said sensor to determine an amount of strain experienced by said orthopedic implant.
24. The method of claim 23 , wherein said sensor in response to interrogation provides a signal of a first frequency in said absence of strain and a signal of a second, different frequency in said presence of strain, said second, different frequency being said first indication,
25. An assembly, comprising:
a flexible body having a folded state and an unfolded state; and
a plurality of sensors supported by said flexible body, said plurality of sensors providing an indication of whether said flexible body is in said folded state or said unfolded state.
26. The assembly of claim 25 , wherein said flexible body is a portion of an orthopedic implant.
27. The assembly of claim 25 , wherein said fold is detected base(on a relative position of a first sensor, to a second sensor.
28. The assembly of claim 27 , wherein said first sensor and said second sensor are passive sensors interrogated by an external device.
29. The assembly of claim 28 , wherein said first sensor and said second sensor are each resonant circuits which provide said indication based on a separation between said first sensor and said second sensor.
30. The assembly of claim 29 , wherein when said first sensor and said second sensor are spaced a first distance apart said first sensor resonates in response to a first frequency from said external device and said second sensor resonates in response to a second frequency from said external device and when said first sensor and said second sensor are spaced less than said first distance apart said first sensor and said second sensor resonate together in response to a third frequency from said external device.
31. The assembly of claim 30 , wherein said external device interrogates said plurality of sensors through a frequency range including said first frequency, said second frequency, and said third frequency.
32. An assembly, comprising:
a flexible body having a folded state and an unfolded state; and
means for sensing whether said flexible body is in said folded state or said unfolded state.
33. The assembly of claim 32 , wherein said means for sensing said shape of said flexible body is a passive sensing means.
34. The assembly of claim 32 , wherein said means for sensing said shape of said flexible body is an active sensing means.
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USRE48387E1 (en) | 2010-12-29 | 2021-01-12 | DePuy Synthes Products, Inc. | Electric motor driven tool for orthopedic impacting |
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Also Published As
Publication number | Publication date |
---|---|
WO2009148847A2 (en) | 2009-12-10 |
US8029566B2 (en) | 2011-10-04 |
US20090299228A1 (en) | 2009-12-03 |
WO2009148847A3 (en) | 2011-08-04 |
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