Systems and methods for monitoring the cure of pmma bone cement during surgery
AssigneeOrthopatent, LLC
InventorsDaniel A. FUNK, Quang-Viet NGUYEN
Life of this patent
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Abstract
The invention comprises a system which determines the cure status of bone cement which is then used in making surgical decisions on the cement use and further comprises a system for aiding in securing an implant to a bone using a cured grout or bone cement. The system includes a device which comprises a frequency sensor joined to a circuit to monitor one or more frequency signals, and to an indicator that emits a signal in response to a current emitted to the circuit by the system while monitoring the state of cure. The invention also relates to surgical methods using the system.
Claims27
A system for securing an implant to a bone during surgery, comprising an implant, a grout or bone cement comprising a composition that cures during the surgery, the grout being capable of securing the implant to the bone in a cured state, and a sensor which imparts an energy wave in the acoustic range to the cement and receives the energy wave from the cement and monitors a frequency change in the energy wave to determine a cure state of the cement and the sensor also being joined to a circuit and to an indicator that emits a signal in response to a current emitted to the circuit by the sensor.
A system for securing an implant to a bone as set forth in 1, wherein the signal is an audio signal, visual signal or haptic signal or signal to a robotic device.
A system for securing an implant to a bone as set forth in 1, wherein the grout or bone cement is an acrylate.
A system for securing an implant to a bone as set forth in 3, wherein the acrylate comprises methyl methacrylate or poly methyl methacrylate.
A system for securing an implant to a bone as set forth in 1, wherein the bone is a human bone.
A system for securing an implant to a bone as set forth in 1, wherein the implant is an intermedullary implant.
A method for securing an implant to a bone, comprising:
- the steps of surgically exposing a bone and selecting an implant, applying an adhesive, grout or bone cement to the implant or to the bone, the adhesive, grout or bone cement comprising a composition that cures during surgery, the adhesive being capable of securing the implant to the bone in a cured state, using a tester to determine a state of cure of the adhesive, the tester comprising a frequency sensor which transmits a signal having a frequency below 10 MHz and which receives a response of the signal propagated through the grout or bone cement, the frequency sensor being in electrical contact with a circuit which is capable of conducting a current in response to a change in the frequency of the received signal, and to an indicator that emits a signal in response to an increase in the current in the circuit.
A method for securing an implant to a bone as set forth in 7, wherein the signal is an audio signal.
A method for securing an implant to a bone as set forth in 7, wherein the signal is a visual signal.
A method for securing an implant to a bone as set forth in 7, wherein the signal is a haptic signal.
A method for securing an implant to a bone as set forth in 7, wherein the adhesive, grout or bone cement is an acrylate.
A method for securing an implant to a bone as set forth in 7, wherein the acrylate comprises methyl methacrylate or poly methyl methacrylate.
A method for securing an implant to a bone as set forth in 7, wherein the bone is a human bone.
A method for securing an implant to a bone set forth in 13, wherein the implant is an intermedullary implant.
A system for sensing the cure point of PMMA cement having a tester assembly having a circuit which conducts a current in response to a change in frequency of a received signal and a frequency sensor which includes a sensor probe which is a frequency in mechanical contact with the PMMA cement and which monitors a mechanical resonance spectra and frequency peaks of the tester assembly and which receives a response of the received signal propagated through the PMMA cement, the frequency sensor being in electrical contact with the circuit, and to an indicator that emits a signal in response to an increase in the current in the circuit.
Dependencies are inferred from the claim text.