Spinal rod connecting components with active sensing capabilities
A digital pedicle screw assembly may be installed inside of the body of a patient and be configured to sense various attributes of the assembly and the patient. Embodiments may include a receiver having a U-shaped cavity for supporting a longitudinal rod and set screw therein. The receiver may include a lower cavity configured to couple to a pedicle screw and a side portion integrally connected to the receiver and including a housing defining a sealed cavity for supporting a microelectronics assembly and a battery therein. Embodiments may include at least one antenna attached to an outside of the housing and being in electrical communication with the microelectronics assembly, and at least one strain gauge configured to detect a localized force experienced by the receiver and being in electrical communication with the microelectronics assembly.
1 . A load sensing spinal implant, comprising:
a receiver comprising a U-shaped cavity for supporting a longitudinal rod and set screw therein, the receiver including a lower cavity configured to couple to a pedicle screw;
a side portion integrally connected to the receiver and including a housing defining a sealed cavity for supporting a microelectronics assembly and a battery therein;
at least one antenna attached to an outside of the housing and being in electrical communication with the microelectronics assembly; and
at least one strain gauge configured to detect a localized force experienced by the receiver and being in electrical communication with the microelectronics assembly;
wherein the at least one antenna is configured to transmit information received from the at least one strain gauge to an external device,
wherein the receiver is connected to the side portion by an isolation beam, and
wherein the isolation beam further comprises an internal cylindrical cavity that extends through the isolation beam and into the cavity defined by the housing, the at least one strain gauge being disposed inside of the cylindrical cavity.
2 . The load sensing spinal implant of claim 1 , wherein the at least one antenna is configured to utilize a Medical Implant Communication System (MICS) technology.
3 . The load sensing spinal implant of claim 1 , wherein the at least one antenna is configured to utilize a Bluetooth low energy (BLE) technology.
4 . The load sensing spinal implant of claim 1 , wherein an overmold is configured to surround the at least one antenna thereby forming a hermetic seal over the at least one antenna.
5 . The load sensing spinal implant of claim 1 , wherein the sealed cavity is hermetically sealed.
6 . The load sensing spinal implant of claim 1 , wherein at least one pass through connection extends through a sidewall of the housing thereby placing the at least one antenna in electrical communication with the microelectronics assembly.
7 . The load sensing spinal implant of claim 1 , wherein the housing further comprises a cover configured to seal an opening of the cavity for placing the microelectronics assembly therein.
8 . The load sensing spinal implant of claim 7 , wherein the cover is welded to the housing.
9 . The load sensing spinal implant of claim 1 , further comprising at least one of: a temperature sensor, an accelerometer sensor, a gyroscope sensor, and an impedance sensor.
10 . The load sensing spinal implant of claim 1 , further comprising the microelectronics assembly, wherein the microelectronics assembly further comprises a memory storage configured to periodically store information received from the at least one strain gauge.
11 . The load sensing spinal implant of claim 1 , further comprising the microelectronics assembly, wherein the microelectronics assembly further comprises a wake-up sensor configured to power up the microelectronics assembly and cause the at least one antenna to initiate a transmission of information to the external device.
12 . The load sensing spinal implant of claim 1 , wherein a size and shape of the at least one strain gauge corresponds to a diameter of the cylindrical cavity.
13 . The load sensing spinal implant of claim 1 , wherein the at least one strain gauge is disposed within a cavity inside of the receiver at a relative height that disposes the at least one strain gauge at a height that is above a lower surface of the U-shaped cavity.
14 . The load sensing spinal implant of claim 1 , wherein the at least one strain gauge is disposed within a cavity inside of the receiver at a relative height that disposes the at least one strain gauge at a height that is below a lower surface of the U-shaped cavity.
15 . A load sensing spinal implant, comprising:
a receiver comprising a U-shaped cavity for supporting a longitudinal rod and set screw therein, the receiver including a lower cavity configured to couple to a pedicle screw;
a side portion integrally connected to the receiver by an isolation beam, the side portion including a housing defining a sealed cavity for supporting a microelectronics assembly and a battery therein;
at least one antenna attached to an outside of the housing and being in electrical communication with the microelectronics assembly, the at least one antenna being configured to utilize a Medical Implant Communication System (MICS) technology; and
at least one strain gauge disposed in a region corresponding to the isolation beam, the at least one strain gauge being configured to detect a localized force experienced by the receiver and being in electrical communication with the microelectronics assembly,
wherein the at least one antenna is configured to transmit information received from the at least one strain gauge to an external device, and
wherein the isolation beam further comprises an internal cylindrical cavity that extends through the isolation beam and into the cavity defined by the housing, the at least one strain gauge being disposed inside of the cylindrical cavity on a sidewall thereof closest to the U-shaped cavity.