CN212817626U - Radio frequency signal detection device and retina stimulator - Google Patents
Radio frequency signal detection device and retina stimulator Download PDFInfo
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- CN212817626U CN212817626U CN201921691965.4U CN201921691965U CN212817626U CN 212817626 U CN212817626 U CN 212817626U CN 201921691965 U CN201921691965 U CN 201921691965U CN 212817626 U CN212817626 U CN 212817626U
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N1/00—Electrotherapy; Circuits therefor
- A61N1/02—Details
- A61N1/04—Electrodes
- A61N1/05—Electrodes for implantation or insertion into the body, e.g. heart electrode
- A61N1/0526—Head electrodes
- A61N1/0543—Retinal electrodes
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N1/00—Electrotherapy; Circuits therefor
- A61N1/18—Applying electric currents by contact electrodes
- A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
- A61N1/36—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation
- A61N1/36046—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation of the eye
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N1/00—Electrotherapy; Circuits therefor
- A61N1/18—Applying electric currents by contact electrodes
- A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
- A61N1/36—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation
- A61N1/372—Arrangements in connection with the implantation of stimulators
- A61N1/37211—Means for communicating with stimulators
- A61N1/37252—Details of algorithms or data aspects of communication system, e.g. handshaking, transmitting specific data or segmenting data
- A61N1/3727—Details of algorithms or data aspects of communication system, e.g. handshaking, transmitting specific data or segmenting data characterised by the modulation technique
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Abstract
The utility model discloses a radio frequency signal detection device is a radio frequency signal detection device that is used for the retina stimulator including implanting the device and having transmitting coil's external equipment, a serial communication port, include: a resonance circuit for receiving a radio frequency signal generated by the implant device by using the detection coil, the radio frequency signal including a carrier signal and a baseband signal, the frequency of the carrier signal being greater than the frequency of the baseband signal, the detection coil being wound around the periphery of the transmission coil in a direction forming an included angle with the peripheral direction of the transmission coil; a demodulation circuit for extracting a baseband signal from a radio frequency signal; the comparison circuit is used for comparing the baseband signal with a reference signal to obtain a comparison result; and a processing module for monitoring the radio frequency signal based on the comparison result. According to the utility model discloses, can monitor the radio frequency signal that implants the device production effectively.
Description
The application is filed as12 month and 27 days 2018Application No. is2018222207385The invention is named asRadio frequency signal Number detection device and retina stimulatorDivisional application of the patent application.
Technical Field
The utility model relates to the field of medical equipment, concretely relates to radio frequency signal detection device and retina stimulator.
Background
Normal vision is developed by the photoreceptor cells on the retina within the eyeball converting external light signals into visual signals. Visual signals reach the cerebral cortex via bipolar cells and ganglion cells, creating light sensation. However, in life, patients have an entire pathway blocked due to retinal diseases such as RP (retinitis pigmentosa), AMD (age-related macular degeneration), and the like, resulting in visual deterioration or blindness.
Retinal stimulator technology has been developed to restore partial vision to patients. Retinal stimulator technology can use electrical current to stimulate still intact nerves, allowing the brain to receive signals and think that the senses are still working properly.
With the research and development of technology, there has been a technical means for repairing the above-mentioned retinal diseases using a retinal stimulator or the like, by which the brain can receive an external stimulus signal and obtain improved vision. In order to restore part of the visual sensation to the patient, an implant device is generally placed inside the eyeball of the patient, and an image processing device and a camera device, which communicate with the implant, are arranged outside the patient's body. The image pickup device outside the body captures an image, and then the image is processed by the image processing device, and a processed image signal (analog signal) is transmitted to the implantation device. The implanted device further converts these image signals into electrical stimulation signals to stimulate ganglion cells or bipolar cells on the retina, thereby producing light perception to the patient.
In order to ensure that the implanted device in the body can accurately receive the analog signal transmitted by the transmitting device in the body, the implanted device senses the received analog signal and transmits the sensed analog signal back to the transmitting device in the body, and the transmitting device in the body monitors the sensed analog signal of the implanted device. Due to the limitation of the volume of the implantation device, the antenna area in the implantation device cannot be matched with the antenna area of the external transmitting device, the transmitting power of the implantation device is low, and therefore the induction analog signal monitored by the external transmitting device is low, the accuracy is low, and the external transmitting device cannot accurately detect the analog signal generated by the implantation device.
Disclosure of Invention
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a radio frequency signal detection device and a retina stimulator capable of accurately detecting a radio frequency signal generated by an implant device.
To this end, a first aspect of the present invention provides a radio frequency signal detection device for a retinal stimulator including an implant device and an extracorporeal device having a transmitting coil, comprising: a resonance circuit for receiving a radio frequency signal generated by the implant device by using a detection coil, the radio frequency signal including a carrier signal and a baseband signal, the frequency of the carrier signal being greater than the frequency of the baseband signal, the detection coil being wound around the periphery of the transmission coil in a direction forming an angle with the peripheral direction of the transmission coil; a demodulation circuit for extracting the baseband signal from the radio frequency signal; the comparison circuit is used for comparing the baseband signal with a reference signal to obtain a comparison result; and a processing module for monitoring the radio frequency signal based on the comparison result.
The utility model discloses in, resonant circuit utilizes the detection coil to receive the radio frequency signal who is produced by implanting the device, and resonant circuit's detection coil winding is in the periphery of the transmitting coil of external equipment, and demodulation circuit draws baseband signal from radio frequency signal, and comparison circuit compares baseband signal and reference signal and obtains the comparison result, and processing module monitors radio frequency signal based on the comparison result. In this case, the radio frequency signal detection device can reduce the influence on the primary circuit by a current coupling mode, and can read the radio frequency signal emitted by the implant device with higher sensitivity under the condition that the coil area of the implant device is limited, so that the radio frequency signal generated by the implant device can be effectively monitored.
In the radio frequency signal detecting device provided by the first aspect of the present invention, optionally, the transmitting coil is used for transmitting the radio frequency signal, the implanting device includes a receiving coil coupled with the transmitting coil, and the detecting coil is used for detecting the current generated by the coupling of the transmitting coil and the receiving coil. Therefore, by means of the current coupling mode, under the condition that the coil area of the implant device is limited, the radio-frequency signals transmitted by the implant device can be read with high sensitivity.
In the radio frequency signal detection device provided by the first aspect of the present invention, optionally, the resonance circuit is an LC parallel resonance circuit. Thereby, a radio frequency signal having a frequency corresponding to the resonance frequency of the resonance circuit can be obtained.
In the radio frequency signal detection apparatus provided by the first aspect of the present invention, optionally, the radio frequency signal is an amplitude modulation signal. In this case, the penetration of the amplitude-modulated signal is strong, and thus, the radio frequency signal can be transmitted more accurately.
In the radio frequency signal detection apparatus provided by the first aspect of the present invention, optionally, the demodulation circuit includes a detection circuit for filtering the carrier signal and retaining the baseband signal. Thereby, a baseband signal can be obtained.
In the radio frequency signal detection device provided by the first aspect of the present invention, optionally, the detection circuit includes a diode and an RC filter circuit. This can simplify the circuit configuration.
The utility model discloses an among the radio frequency signal detection device that the first aspect provided, optionally, still include amplifier circuit, amplifier circuit be used for with baseband signal amplifies, obtains amplifying baseband signal. Thereby, processing of the baseband signal is facilitated.
In the radio frequency signal detection device provided by the first aspect of the present invention, optionally, the comparison circuit includes a voltage comparator, and the voltage comparator is configured to compare the amplitude of the amplified baseband signal with a reference voltage of the voltage comparator. This enables the analog baseband signal to be converted into a digital signal.
In the radio frequency signal detection apparatus provided in the first aspect of the present invention, optionally, when the comparison circuit compares that the baseband signal is greater than the reference signal, the comparison circuit outputs a high level; when the comparison circuit compares that the baseband signal is smaller than the reference signal, the comparison circuit outputs a low level. This enables the analog baseband signal to be converted into a digital signal.
A second aspect of the present invention provides a retinal stimulator, comprising: an extracorporeal apparatus comprising a camera device for capturing video images and converting the video images into visual signals, a video processing device connected to the camera device and processing the visual signals and generating radio frequency signals, and a transmitting device for transmitting the radio frequency signals to the implant device via a transmitting coil; and an implant device for converting the received radio frequency signal into a pulsed current signal as an electrical stimulation signal to deliver the pulsed current signal to the retina; wherein the extracorporeal device further comprises the radio frequency signal detection apparatus in the first aspect.
According to the utility model discloses, can provide one kind and can accurately detect the radio frequency signal detection device and the retina stimulator of the radio frequency signal that the implantation device produced.
Drawings
Fig. 1 is a block diagram of a retinal stimulator according to the present embodiment.
Fig. 2 is a block diagram of the radio frequency signal detection device according to the present embodiment.
Fig. 3 is a schematic diagram of a coil distribution structure in the retinal stimulator according to the present embodiment.
Fig. 4 is a schematic configuration diagram of the resonance circuit according to the present embodiment.
Fig. 5 is a schematic configuration diagram of the detector circuit according to the present embodiment.
Fig. 6 is a schematic configuration diagram of a comparison circuit according to the present embodiment.
Fig. 7 is a block diagram of another example of the radio frequency signal detection device according to the present embodiment.
Fig. 8 is a schematic configuration diagram of an amplifying circuit in the radio frequency signal detecting apparatus of fig. 7.
Fig. 9 is a schematic circuit diagram of the rf signal detecting apparatus of fig. 7.
Detailed Description
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, the same components are denoted by the same reference numerals, and redundant description thereof is omitted. The drawings are schematic and the ratio of the dimensions of the components and the shapes of the components may be different from the actual ones.
In addition, the headings and the like referred to in the following description of the present invention are not intended to limit the content or scope of the present invention, but only serve as a reminder for reading. Such a subtitle should neither be understood as a content for segmenting an article, nor should the content under the subtitle be limited to only the scope of the subtitle.
(retina stimulator)
Fig. 1 is a block diagram of a retinal stimulator according to the present embodiment. The retinal stimulator 1 according to the present embodiment can be applied to the blind. For example, congenital blind, acquired blind. The blind in this embodiment may also be a patient who has blindness due to retinopathy but has intact visual pathways such as bipolar cells and ganglion cells. In the present embodiment, the retinal stimulator 1 is also sometimes referred to as an "artificial retina", "artificial retinal system", or the like.
In the present embodiment, as shown in fig. 1, the retinal stimulator 1 may include an intracorporeal implant part, i.e., an implant device 10, and an extracorporeal part, i.e., an extracorporeal apparatus 20. In some examples, the extracorporeal device 20 may include a camera 21, a video processing device 22, a transmitting device 23, and a radio frequency signal detection device 24 (see fig. 1).
In the present embodiment, as shown in fig. 1, the camera 21 may be used to capture a video image and convert the video image into a visual signal.
In some examples, the image capture device 21 may be an apparatus having an image capture function, such as a video camera, a still camera, or the like. For ease of use, a camera of smaller volume may be designed on (e.g., embedded in) the eyewear.
In other examples, the patient may also capture video images by wearing lightweight camera-enabled glasses as the camera 21. The imaging device 21 may be implemented by google glasses or the like. In addition, the imaging device 21 may be mounted on smart wearable devices such as smart glasses, smart head wears, and smart bracelets.
In the present embodiment, as shown in fig. 1, the video processing device 22 may receive the visual signal generated by the image pickup device 21, process the received visual signal, and generate a modulated signal. The modulated signal may be an analog signal. The modulated signal may also sometimes be referred to as a radio frequency signal.
In the present embodiment, the image pickup device 21 may be connected to the video processing device 22. The imaging device 21 and the video processing device 22 may be connected by wire or wirelessly. In some examples, the wired connection may be a data line connection, the wireless connection may be a bluetooth connection, a WiFi connection, an infrared connection, an NFC connection, or a radio frequency connection, among others.
In some examples, both the camera device 21 and the video processing device 22 may be configured outside the patient's body. For example, the patient may wear the imaging device 21 on glasses. In addition, the patient may wear the imaging device 21 on a wearable accessory such as a head gear, a hair band, or a brooch. In addition, the patient can wear the video processing device 22 on the waist, and the patient can wear the video processing device 22 on the arm, leg, or the like. Examples of the present invention are not limited thereto, and for example, the patient may also place the video processing device 22 in, for example, a carry-on handbag or backpack.
In this embodiment, as shown in fig. 1, the transmitting device 23 may transmit a radio frequency signal. In particular, the transmitting device 23 may include a transmitting coil 310, and the transmitting device 23 may transmit the radio frequency signal to the implant device 10 through the transmitting coil 310. I.e. the transmit coil 310 may be used to transmit radio frequency signals.
In this embodiment, the implant device 10 can be used to receive the rf signal transmitted by the transmitting device 23 and generate a pulsed current, such as a bidirectional pulsed current, to stimulate the retina (specifically, ganglion cells and bipolar cells of the retina) by controlling the microelectrode array with the pulsed current. The retina can receive the pulse current to generate excitation response so as to enable the patient to obtain light sensation.
Specifically, in this embodiment, the implant device 10 may include a receive coil 320. The receive coil 320 is coupled with the transmit coil 310 (see fig. 3). The implant device 10 may receive the radio frequency signal transmitted by the transmitting device 23 via the receiving coil 320. The implant device 10 may be used to convert the received radio frequency signal into a bi-directional pulsed current signal as an electrical stimulation signal to deliver the bi-directional pulsed current signal to ganglion cells or bipolar cells of the retina to produce light sensation. In addition, the implant device 10 may be implanted in a human body.
In this embodiment, as shown in fig. 1, the extracorporeal device 20 further comprises a radio frequency signal detection apparatus 24. That is, the radio frequency signal detection means 24 may be a radio frequency signal detection means for a stimulator, such as the retinal stimulator 1, comprising the implant device 10 and the extracorporeal device 20. Wherein the RF signal detecting device 24 can detect the induced RF signal transmitted back from the implanted device 10, thereby deducing the intensity of the RF signal received by the implanted device 10 (the RF signal is transmitted by the transmitting device 23). Therefore, whether the implanted device 10 in the body accurately receives the radio frequency signal transmitted by the transmitting device 23 outside the body can be judged.
(resonance circuit)
Fig. 2 is a block diagram of the radio frequency signal detection device according to the present embodiment. Fig. 3 is a schematic diagram of a coil distribution structure in the retinal stimulator according to the present embodiment.
In the present embodiment, as shown in fig. 2, the radio frequency signal detection device 24 may include a resonance circuit 241, a demodulation circuit 242, a comparison circuit 243, and a processing module 244.
In this embodiment, the resonant circuit 241 may be used to detect the radio frequency signal generated by the implanted device 10. The rf signal generated by the implanted device 10 is also the induced rf signal returned by the implanted device 10. In some examples, the resonant circuit 241 may include the detection coil 330. In this case, the resonance circuit 241 may receive the radio frequency signal generated by the implant device 10 using the detection coil 330. That is, the detection coil 330 can detect the induced RF signal returned from the implanted device 10.
In some examples, as shown in fig. 3, the detection coil 330 may be wound on the transmission coil 310 (i.e., the outer periphery of the transmission coil 310), for example, the detection coil 330 may be wound on the outer periphery of the transmission coil 310 in a direction forming an angle with the outer peripheral direction of the transmission coil. The detection coil 330 can be used to detect the current generated by the coupling of the transmission coil 310 and the receiving coil 320, and can sensitively detect the strength of the radio frequency signal received by the receiving coil 320. That is, the detection coil 330 can sense the radio frequency signal generated by the implant device 10 by current coupling of the transmission coil 310 and the reception coil 320.
In addition, in the present embodiment, the receiving coil 320 and the transmitting coil 310 may be coaxial. However, the present embodiment is not limited thereto, and the central axis of the receiver coil 320 may be parallel to the central axis of the receiver coil 320 within a certain distance. The range of distances may be any distance less than the sum of the two coil radii.
In the prior art, a voltage matching method is usually adopted to monitor the induced rf signal returned by the implant device 10, however, the voltage matching method often requires a receiving coil 320 with a relatively large area, and cannot generally meet the requirement of being implanted into the eye of a patient. In addition, the influence on the primary circuit, i.e., the circuit transmitting the radio frequency signal in the transmitting device 23 of the extracorporeal device 20, can be reduced.
In this embodiment, the resonant circuit 241 may be used to detect the RF signal generated by the implanted device 10. The radio frequency signal may comprise a carrier signal and a baseband signal. Typically, the baseband signal is the original electrical signal from a source (also referred to as an information source) without modulation (spectral shifting and conversion). The baseband signal is typically lower in frequency. The baseband signal may be a visual signal generated by the image pickup device 21. Typically, the baseband signal is a signal containing the information to be transmitted. For example, the visual signal generated by the camera 21 may carry a signal of information to be transmitted, such as image information required by a blind patient.
In this embodiment, the radio frequency signal is an amplitude modulated signal. Due to the low frequency of the baseband signal, the baseband signal with low frequency can be better transmitted by using the amplitude modulation signal. In addition, the penetration of the amplitude-modulated signal is strong, and the radio-frequency signal can be transmitted more accurately. However, the present embodiment is not limited thereto, and for example, the radio frequency signal may be a frequency modulation signal or a phase modulation signal.
In the present embodiment, the frequency band of the baseband signal is generally wide. Due to bandpass reasons, it is often difficult to have a transmission medium that approximates the bandwidth of the baseband signal, so the baseband signal is generally not transmitted over long distances on a common medium, since intersymbol interference and attenuation are likely to render the baseband signal unrecoverable. To solve this problem, a carrier signal is introduced. A carrier wave is a waveform modulated to transmit a signal. The frequency of the carrier signal may be greater than the frequency of the baseband signal. Modulating the baseband signal with the carrier signal can reduce the bandwidth, enable reliable transmission of the modulated signal (i.e., the radio frequency signal), and reduce attenuation. In addition, because the carrier frequency is single, the bandwidth of the modulated signal (i.e., the radio frequency signal) is small, and the transmission is convenient.
In this embodiment, the RF signal (generated by the implant device 10) sensed by the resonant circuit 241 is strongest when the resonant frequency of the resonant circuit 241 is equal to the frequency of the carrier signal. In this case, the radio frequency signal that the resonance circuit 241 can receive is maximum. The radio frequency signal generated by the implanted device 10 is generated by a radio frequency signal emitted by the emitting device 23 outside its inductor.
In some examples, the resonant circuit 241 may be an LC parallel resonant circuit. The LC parallel resonant circuit is also called a frequency selective circuit. The resonant circuit 241 may select a radio frequency signal having a frequency equivalent to the resonant frequency of the resonant circuit 241, and may filter a radio frequency signal having a frequency that is different from the resonant frequency of the resonant circuit 241.
Fig. 4 is a schematic configuration diagram of the resonance circuit according to the present embodiment.
In this embodiment, as shown in fig. 4, the resonant circuit 241 includes an inductor L, a first capacitor C1, and a second capacitor C2. The first end of the inductor L is connected with a signal. A first terminal of the inductor L may be connected to the anode of the first capacitor C1 and the anode of the second capacitor C2. The second terminal of the inductor L, the negative pole of the first capacitor C1 and the negative pole of the second capacitor C2The poles are grounded. The resonant frequency of the resonant circuit 241 is satisfied
Wherein, C is C1 × C2/(C1+ C2).
In this embodiment, the resonant circuit 241 can change the resonant frequency of the resonant circuit 241 by adjusting the capacitance of the first capacitor C1 and the second capacitor C2 and the inductance of the inductor L. For example, the frequency of the carrier signal is 13.56MHz, the capacitance of the first capacitor C1 and the second capacitor C2 and the inductance of the inductor L can be adjusted to make the resonant frequency of the resonant circuit 241 be 13.56 MHz. In this case, it can be ensured that the rf signal sensed by the resonant circuit 241 is the strongest, and the rf signal received by the resonant circuit 241 is the largest.
(demodulation circuit)
In this embodiment, as shown in fig. 2, the rf signal detecting device 24 may further include a demodulation circuit 242. The demodulation circuit 242 may receive the radio frequency signal detected by the resonance circuit 241. The demodulation circuit 242 may extract a baseband signal from the radio frequency signal. The baseband signal is a signal that is actually transmitted (i.e., a signal of information to be transmitted). The frequency of the baseband signal is lower than the frequency of the carrier signal. The demodulation circuit 242 may be a band pass filter or a low pass filter.
Fig. 5 is a schematic configuration diagram of the detector circuit according to the present embodiment.
In the present embodiment, as shown in fig. 5, the demodulation circuit 242 may include a wave detection circuit 2420. The detection circuit 2420 can be used to filter the carrier signal from the rf signal and retain the baseband signal. The wave detection circuit 2420 may include a diode D1 and an RC filter circuit 2421. The RC filter circuit 2421 may include a first resistor R1, a second resistor R2, and a third capacitor C3. The anode of the diode D1 receives a signal. A cathode of the diode D1 may be connected to a first terminal of a first resistor R1. A second terminal of the first resistor R1 may be connected to a first terminal of the second resistor R2 and the anode of the third capacitor C3. The second end of the second resistor R2 and the cathode of the third capacitor C3 are grounded. The RC filter circuit 2421 can filter the carrier signal and retain the baseband signal by setting the resistance of the first resistor R1, the second resistor R2 and the capacitance of the third capacitor C3. In addition, the RC filter circuit 2421 circuit is generally simpler. This can simplify the circuit configuration.
(comparison Circuit)
In this embodiment, as shown in fig. 2, the rf signal detecting device 24 may further include a comparing circuit 243. The comparison circuit 243 may be configured to compare the baseband signal with a reference signal to obtain a comparison result. In some examples, the comparison circuit 243 may implement an analog-to-digital conversion function, e.g., the comparison circuit 243 is an analog-to-digital converter, thereby being capable of converting an analog baseband signal into a comparison result, e.g., a digital signal. The comparison circuit 243 may be a separate module or an integrated chip module.
In this embodiment, as described above, the comparison circuit 243 may compare the baseband signal with the reference signal to obtain a comparison result. Specifically, when the baseband signal is greater than the reference signal, the comparison circuit 243 outputs a high level as the comparison result. When the baseband signal is smaller than the reference signal, the comparison circuit 243 outputs a low level as a comparison result.
In this embodiment, the reference signal may be a preset fixed reference voltage signal. However, the present embodiment is not limited to this, and the reference signal may be a reference voltage signal that varies within a certain range.
In some examples, the comparison circuit 243 may include a voltage comparator. The voltage comparator may be configured to compare the baseband signal amplitude with a reference voltage of the voltage comparator to obtain a voltage comparison result.
Fig. 6 is a schematic configuration diagram of a comparison circuit according to the present embodiment.
In this embodiment, as shown in fig. 6, the comparison circuit 243 may include a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, and a voltage comparator a 1. The first end of the third resistor R3 can be connected to a baseband signal. A second terminal of the third resistor R3 may be connected to an inverting input of the voltage comparator a 1. The non-inverting input terminal of the voltage comparator a1 may be connected to the second terminal of the fourth resistor R4. A first terminal of the fourth resistor R4 may be coupled to a reference signal. A second terminal of the fourth resistor R4 may be connected to a first terminal of the fifth resistor R5. A second terminal of the fifth resistor R5 may be connected to the output terminal of the voltage comparator a1 and a first terminal of the sixth resistor R6. A second terminal of the sixth resistor R6 is connected to ground. A first terminal of the sixth resistor R6 may be connected to the output terminal of the comparison circuit 243.
(treatment Module)
In this embodiment, as shown in fig. 2, the radio frequency signal detection device 24 may further include a processing module 244. The processing module 244 may be configured to monitor the radio frequency signal from the implanted device 10 based on the comparison. The processing module 244 may be a processor, such as a Central Processing Unit (CPU), a Micro Processing Unit (MPU), an Application Specific Integrated Circuit (ASIC), or the like.
In particular, when the comparison result generated by the comparison circuit 243 is high, it may indicate that the rf signal received by the implant device 10 is strong (e.g., high power); additionally, when the comparison result generated by the comparison circuit 243 is low, it may indicate that the rf signal received by the implanted device 10 is weak (e.g., low power).
In some examples, the processing module 244 may also be connected to a control device (not shown). When the processing module 244 determines that the rf signal received by the implanted device 10 is weak, the control apparatus may control the transmitting device 23 to increase the transmitting power.
In this embodiment, the RF signal detection device 24 shown in FIG. 2 is used to effectively detect the magnitude of the RF signal generated by the implanted device 10.
(amplifying Circuit)
Fig. 7 is a block diagram of another example of the radio frequency signal detection device according to the present embodiment. Fig. 8 is a schematic configuration diagram of an amplifying circuit in the radio frequency signal detecting apparatus of fig. 7.
In this embodiment, the radio frequency signal detection device 24 shown in fig. 7 may further include an amplification circuit 245 in addition to the resonance circuit 241, the demodulation circuit 242, the comparison circuit 243, and the processing module 244 described above. Hereinafter, a detailed description will be given mainly on the amplification circuit 245.
In this embodiment, the amplifier 245 may be configured to amplify a baseband signal to obtain an amplified baseband signal (may be simply referred to as "amplified baseband signal"). Specifically, the amplifying circuit 245 may be configured to amplify the baseband signal demodulated by the demodulating circuit 242 to obtain an amplified baseband signal. The amplification circuit 245 may be a separate module or may be an integrated chip module.
In this embodiment, as shown in fig. 8, the amplifying circuit 245 may include a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a fourth capacitor C4, a fifth capacitor C5, and an operational amplifier a 2. The positive pole of the fifth capacitor C5 can be connected to the baseband signal. A cathode of the fifth capacitor C5 may be connected to a first terminal of the seventh resistor R7 and a first terminal of the eighth resistor R8. A second terminal of the eighth resistor R8 may receive a reference signal. A second terminal of the seventh resistor R7 may be connected to the non-inverting input of the operational amplifier a 2. An inverting input terminal of the operational amplifier a2 may be connected to a first terminal of the ninth resistor R9 and a first terminal of the tenth resistor R10. A second terminal of the ninth resistor R9 may be connected to the anode of the fourth capacitor C4. The cathode of the fourth capacitor C4 is connected to ground. A second terminal of the tenth resistor R10 may be connected to the output terminal of the operational amplifier A2. The output of the operational amplifier a2 outputs an amplified baseband signal.
In this embodiment, the amplifier 245 may output the baseband signal after amplification by a predetermined amplification factor from the input baseband signal. The amplification factor of the amplifying circuit 245 may be determined according to the sizes of the seventh resistor R7, the eighth resistor R8, the ninth resistor R9, the tenth resistor R10, the fourth capacitor C4 and the fifth capacitor C5.
In this embodiment, the amplifying circuit 245 may be configured to amplify the baseband signal demodulated by the demodulating circuit 242 to obtain an amplified baseband signal. The amplified baseband signal may be used for input to the comparing circuit 243, so that the comparing circuit 243 compares the magnitude of the amplified baseband signal with the reference signal to obtain a comparison result. The voltage comparator in the comparing circuit 243 may be configured to compare the amplitude of the amplified baseband signal with a reference voltage of the voltage comparator. The processing module 244 may monitor the rf signal from the implanted device 10 (i.e., the strength of the rf signal received by the implanted device 10) based on the comparison.
In this embodiment, there is a possibility that the rf signal detected by the rf signal detecting device 24 is weak as the transmission power changes, and in this case, after the rf signal is captured by the resonant circuit 241, the baseband signal extracted from the resonant circuit 241 by the demodulation circuit 242 is also weak. In this embodiment, the baseband signal demodulated by the demodulation circuit 242 can be amplified by providing the amplification circuit 245, thereby facilitating subsequent processing of the baseband signal.
Fig. 9 is a schematic circuit diagram of the rf signal detecting apparatus of fig. 7. In fig. 9, the processing module 244 is omitted for convenience of illustration, but the description of the function of the radio frequency signal detection device 24 is not affected.
In the present embodiment, as shown in fig. 9, the radio frequency signal detection device 24 may include a resonance circuit 241, a demodulation circuit 242, an amplification circuit 245, and a comparison circuit 243.
In this embodiment, the resonant circuit 241 shown in fig. 9 may be used to receive the rf signal generated by the implant device 10 using the detection coil 330. Demodulation circuit 242 may be used to extract a baseband signal from a radio frequency signal. The amplifying circuit 245 may be configured to amplify the baseband signal demodulated by the demodulating circuit 242 to obtain an amplified baseband signal. The amplified baseband signal may be used for inputting to the comparing circuit 243, so that the comparing circuit 243 compares the amplified baseband signal with the corresponding reference signal to obtain the comparison result. The processing module 244 may monitor the rf signal from the implant device 10 (i.e., the strength of the rf signal received by the implant device 10) based on the comparison. Thus, the RF signal detection device 24 can accurately detect the baseband signal in the RF signal generated by the implanted device 10.
In some examples, the resonance circuit 241 may receive the rf signal generated by the implant device 10 using the detection coil 330, the detection coil 330 of the resonance circuit 241 is wound around the periphery of the transmission coil 310 of the extracorporeal device 20, the demodulation circuit 242 may extract a baseband signal from the rf signal, the comparison circuit 243 may compare the baseband signal with a reference signal to obtain a comparison result, and the processing module 244 may monitor the rf signal from the implant device 10 based on the comparison result. In this case, the rf signal detecting device 24 can reduce the influence on the primary circuit by means of current coupling, and can read the rf signal of the secondary circuit (i.e., the circuit for receiving and processing the rf signal in the implant device 10) with high sensitivity under the condition that the coil area of the implant device is limited.
While the present invention has been described in detail in connection with the drawings and the examples, it is to be understood that the above description is not intended to limit the present invention in any way. The present invention may be modified and varied as necessary by those skilled in the art without departing from the true spirit and scope of the invention, and all such modifications and variations are intended to be included within the scope of the invention.
Claims (10)
1. A radio frequency signal detection device for detecting an induced radio frequency signal transmitted back from an implanted device,
the method comprises the following steps:
a resonant circuit for receiving the induced rf signal returned by the implanted device using a detection coil, the induced rf signal comprising a carrier signal and a baseband signal;
a demodulation circuit for extracting the baseband signal from the induced radio frequency signal;
the comparison circuit is used for comparing the baseband signal with a reference signal to obtain a comparison result; and
a processing module for monitoring the induced radio frequency signal based on the comparison result,
wherein the resonance circuit is an LC parallel resonance circuit, the resonance circuit comprises an inductor, a first capacitor and a second capacitor, the first end of the inductor is connected with the anode of the first capacitor and the anode of the second capacitor, the second end of the inductor, the cathode of the first capacitor and the cathode of the second capacitor are grounded, the demodulation circuit includes a detection circuit for filtering the carrier signal and retaining the baseband signal, the detection circuit comprises a diode and an RC filter circuit, the RC filter circuit comprises a first resistor, a second resistor and a third capacitor, the anode of the diode inputs a signal, the cathode of the diode is connected with the first end of the first resistor, the second end of the first resistor is connected with the first end of the second resistor and the anode of the third capacitor, and the second end of the second resistor and the cathode of the third capacitor are grounded.
2. The radio frequency signal detection device according to claim 1,
the implant device comprises a receiving coil coupled with a transmitting coil for transmitting radio-frequency signals, and the detecting coil is wound on the periphery of the transmitting coil.
3. The radio frequency signal detection device according to claim 2,
the implant device receives the radio-frequency signal emitted by the emitting coil and transmits back the induction radio-frequency signal, and the detecting coil is used for detecting the current generated by the coupling of the emitting coil and the receiving coil.
4. The radio frequency signal detection device according to claim 1,
the demodulation circuit is a band-pass filter or a low-pass filter.
5. The radio frequency signal detection device according to claim 2,
the receive coil is coaxial with the transmit coil.
6. The radio frequency signal detection device according to claim 1,
the resonant circuit can select the induction radio frequency signal with the frequency equivalent to the resonant frequency of the resonant circuit, and the induction radio frequency signal with the frequency which is greatly different from the resonant frequency is filtered.
7. The radio frequency signal detection device according to claim 1,
the baseband signal processing circuit further comprises an amplifying circuit, wherein the amplifying circuit is used for amplifying the baseband signal to obtain an amplified baseband signal.
8. The radio frequency signal detection device according to claim 1,
the comparison circuit comprises a third resistor, a fourth resistor, a fifth resistor, a sixth resistor and a voltage comparator, wherein the first end of the third resistor is connected to the baseband signal, the second end of the third resistor is connected to the inverting input end of the voltage comparator, the non-inverting input end of the voltage comparator is connected to the second end of the fourth resistor, the first end of the fourth resistor is connected to the reference signal, the second end of the fourth resistor is connected to the first end of the fifth resistor, the second end of the fifth resistor is connected to the output end of the voltage comparator and the first end of the sixth resistor, and the second end of the sixth resistor is grounded.
9. The radio frequency signal detection device according to claim 7,
the amplifying circuit comprises a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a fourth capacitor, a fifth capacitor and an operational amplifier, wherein the anode of the fifth capacitor is connected to the baseband signal, the cathode of the fifth capacitor is connected to the first end of the seventh resistor and the first end of the eighth resistor, the second end of the eighth resistor can be connected to the reference signal, the second end of the seventh resistor is connected to the non-inverting input end of the operational amplifier, the inverting input end of the operational amplifier is connected to the first end of the ninth resistor and the first end of the tenth resistor, the second end of the ninth resistor is connected to the anode of the fourth capacitor, the cathode of the fourth capacitor is grounded, and the second end of the tenth resistor is connected to the output end of the operational amplifier.
10. A retinal stimulator, characterized in that,
the extracorporeal equipment comprises an extracorporeal equipment and an implantation device matched with the extracorporeal equipment, wherein the extracorporeal equipment comprises a camera device used for capturing video images and converting the video images into visual signals, a video processing device connected with the camera device and processing the visual signals and generating radio frequency signals, and a transmitting device used for transmitting the radio frequency signals to the implantation device through a transmitting coil; the implantation device is used for converting the received radio frequency signal into a pulse current signal serving as an electric stimulation signal so as to deliver the pulse current signal to the retina; wherein the extracorporeal device further comprises the radiofrequency signal detection apparatus of any one of claims 1 to 9.
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| CN201822220738.5U CN210121293U (en) | 2017-12-29 | 2018-12-27 | Radio frequency signal detection device and retina stimulator |
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| CN201811614529.7A Active CN109701157B (en) | 2017-12-29 | 2018-12-27 | Radio frequency signal detection device with detection coil and retina stimulator |
| CN201811615995.7A Active CN109675193B (en) | 2017-12-29 | 2018-12-27 | Radio-frequency signal detection device and retina stimulator |
| CN201822220738.5U Active CN210121293U (en) | 2017-12-29 | 2018-12-27 | Radio frequency signal detection device and retina stimulator |
| CN201910960603.9A Active CN110548225B (en) | 2017-12-29 | 2018-12-27 | Radio frequency signal detection device and retina stimulator |
| CN201921691965.4U Active CN212817626U (en) | 2017-12-29 | 2018-12-27 | Radio frequency signal detection device and retina stimulator |
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| CN201811615995.7A Active CN109675193B (en) | 2017-12-29 | 2018-12-27 | Radio-frequency signal detection device and retina stimulator |
| CN201822220738.5U Active CN210121293U (en) | 2017-12-29 | 2018-12-27 | Radio frequency signal detection device and retina stimulator |
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| CN110548224B (en) | 2021-07-20 |
| CN109701157B (en) | 2020-07-28 |
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| CN210121293U (en) | 2020-03-03 |
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