JP3595646B2 - Biological implantation device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a cardiac pacemaker having an extracorporeal charger for externally charging an internal battery for a biological implantable device.Biological implanting deviceAbout.
[0002]
[Prior art]
2. Description of the Related Art A primary battery having a large amount of energy per volume is used as a device for supplying power to a control circuit of a biological implantable device such as a cardiac pacemaker. However, since the primary battery cannot be charged, when the battery reaches the end of its life, re-implantation of a device filled with a new battery is required, and the mental and physical burden on the patient is great. For this reason, introduction of a rechargeable secondary battery is desired.
[0003]
However, in order to perform percutaneous charging of a living body implanted device having a secondary battery from outside the body, information for determining whether or not to continue the charging operation based on the charging status of the secondary battery is provided. Must be sent outside the body. In addition, a charging method suitable for the characteristics of the secondary battery to be used is required, and measures against abnormal heat generation during charging are required.
[0004]
Conventionally, in order to perform such charging control, an AC electromagnetic field is continuously generated from the outside of the body by an inverter circuit and transmitted to the inside of the body, and the inside of the body is used for charging monitoring information and charging of the secondary battery. The accompanying abnormality monitoring detection information and the like are constantly transmitted to the extracorporeal device by telemetry, and the extracorporeal device performs a charging operation including a stop of power transmission due to an abnormality.
[0005]
In such a conventional cardiac pacemaker, the transmission of an AC electromagnetic field from the outside of the body for charging and the telemetry monitoring information from the inside of the body are simultaneously performed, and abnormal measures of the cardiac pacemaker accompanying the charging are taken out of the body. This is implemented by controlling the amount of power transmitted by the charger.
[0006]
[Problems to be solved by the invention]
However, during the power transmission operation, the electromagnetic field strength for charging is very large, so that the telemetry electromagnetic field when transferring the monitoring information of the secondary battery to the outside of the body by telemetry is strong due to the transmission electromagnetic field. Receive interference.
[0007]
As a result, errors may occur in the transcutaneous transfer information by telemetry, incorrect charging control of the secondary battery may occur, and overcharging of the secondary battery may cause damage to the battery itself and other electronic circuit components. There was danger.
[0008]
In addition, when charge monitoring and charge control based on the charge monitoring are performed in a living body by a cardiac pacemaker implanted in the living body, downsizing and consumption of the device, which is one of the conditions as a device implanted in the living body, is achieved. This is the limit to power reduction.
Accordingly, the present invention provides a cardiac pacemaker implanted in the body.Biological implanting equipment such asFromTransfer of charge monitoring and charge control functions to external chargers as much as possibleCharge monitoring informationExternal external chargerTaken outIn addition, a living body implant comprising a living body implanted device and an external charger that can reduce the amount of execution processing required for controlling the implanted device by controlling the in-vivo charging operation from outside the body by making a determination with the extracorporeal chargerIt is intended to provide a device.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the present inventionLiving body implantationThe equipment isA body implanting device including a secondary battery that percutaneously receives an AC electromagnetic field generated outside the body, charges the device, and supplies electric energy to a device implanted in a living body, and transcutaneously transmits the AC electromagnetic field. A cardiac pacemaker device having an extracorporeal charger for charging a secondary battery of the living body implanted device from outside the body, wherein the living body implanted device has a charging mode in which charging to the secondary battery is accepted and a non-charging mode in which charging is not accepted. Having a charging mode, receiving a charging start command from the extracorporeal charger, transitioning from the non-charging mode to the charging mode, receiving a charging stop command from the extracorporeal charger, and not charging from the charging mode. Mode, and the charge stop command is issued upon determining that the extracorporeal charger stops charging based on the charge monitoring information received from the living body implanted device. It is including a charge stop commandIt is characterized by the following.
[0010]
In addition,The issuance of the charge stop command by the extracorporeal charger includes a forcible termination of charging determined to be abnormal and a normal termination of charging determined to be normal.You may do so.
[0011]
Also,The charging abnormality is received from the living body implanting device when the charging period monitoring timer that started timing at the time of issuing the charging start command has timed out, when the invalidation information of the charging stop request is received from the living body implanting device, Includes the case where the number of times that the value of the rechargeable battery charge information is out of the specified range continues for a predetermined number of times.You may do so.
[0012]
AndThe living body implanted device, when the timeout of the charging period monitoring timer that started timing at the time of receiving the charge start command, occurs, without waiting for the charge stop command from the extracorporeal charger, from the charge mode to the non-charge mode. Changes toYou may make it.
[0013]
Further, the living body implanting device may include the secondary battery and / orIn the bio-implant device for charging the secondary batteryHaving a temperature detecting means for detecting the temperature of the charging circuit, when the temperature detecting means detects a temperature abnormality, so as to disconnect the charging input without waiting for the charging stop command from the extracorporeal charger Is also good.
[0014]
Also,A living body implanting device of the present invention percutaneously receives an AC electromagnetic field generated from an extracorporeal charger, performs charging, and includes a secondary battery that supplies electric energy to a device implanted in a living body. In the, having a charging mode to accept charging to the secondary battery, and a non-charging mode not accepting charging, receiving a charging start command from the extracorporeal charger, transition from the non-charging mode to the charging mode Receiving a charge stop command from the extracorporeal charger, transitioning from the charging mode to the non-charging mode, and the extracorporeal charger is charged based on the charge monitoring command transmitted to the extracorporeal charger. It includes a charge stop command issued when it is determined that.
[0015]
Also,The extracorporeal charger of the present invention is an extracorporeal charger that percutaneously transmits an alternating electromagnetic field to charge a secondary battery of a living body implanted device from outside the body, and issues a charge start command to the living body implanted device at the start of charging. Monitoring charge monitoring information percutaneously received from the living body implanting device, and issuing a charge stop command to the living body implanting device percutaneously when it is determined to stop charging..
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is an overall configuration diagram of a cardiac pacemaker device including a living body implanting device 50 and an extracorporeal charger 1.
[0017]
Reference numeral 2 denotes a primary battery as a charging power source arranged outside the body for percutaneously charging a cardiac pacemaker as the living body implanting device 50. 10 transforms (steps up / down) the voltage of the primary battery 2 outside the body in order to make the strength of the AC electromagnetic field for transdermal charging correspond to the voltage of the secondary battery 53 used for the cardiac pacemaker. And a switching circuit, which is composed of an inductance 11, a switching transistor 12, a diode 13, a smoothing capacitor 14, and the like.
[0018]
In order to obtain a desired DC voltage by performing a step-up or step-down operation in the transformer circuit 10, the pulse width of a control pulse applied to a gate for conducting the switching transistor 12 may be adjusted.
[0019]
Reference numeral 20 denotes an inverter circuit that generates an AC electromagnetic field for performing percutaneous charging, and is basically configured by combining four switching transistors 21 to 24 in series and parallel in a bridge shape.
[0020]
In the inverter circuit 20, the DC voltage supplied from the transformer circuit 10 is controlled by conducting two different switching transistors 21 to 24 (21 and 24 and 22 and 23) at different times. , An AC voltage is generated between A and B in FIG.
[0021]
In order to change the amplitude of the AC voltage or stop the generation thereof, the time width of the control pulse applied to the gates of the two sets of switching transistors 21, 24 and 22, 23 is changed, or the applied control pulse is stopped. Can be carried out. 25 is a smoothing capacitor.
[0022]
Reference numeral 31 denotes a power transmission coil for transmitting power to a cardiac pacemaker implanted in the living body based on the AC voltage generated by the inverter circuit 20, and the coil specifies the radiation directivity of the electromagnetic field. In order to increase the strength, it is braided into a ferrite core or the like.
[0023]
Reference numeral 70 denotes a living tissue such as muscle or fat interposed between the skin surface of the living body and the cardiac pacemaker implanted in the living body (hereinafter, referred to as “living body skin 70”).
[0024]
Reference numeral 51 denotes a case of a cardiac pacemaker, which is an implantable device 50, which is made of a metal such as titanium or a metal alloy, and whose surface is coated with a polymer resin or the like so as not to cause inflammation in the living body. ing.
[0025]
Reference numeral 52 denotes a power receiving coil mounted in the implantable device case 51, which receives an AC electromagnetic field for charging from the power transmitting coil 31 outside the body via the skin 70 of the living body and the implantable device case 51.
[0026]
Reference numeral 60 denotes a power receiving rectifier circuit, which is composed of four diodes 61 to 64 and a smoothing capacitor 65 combined in a bridge shape. The AC voltage received by the power receiving coil 52 is full-wave rectified to remove ripples. I do.
[0027]
Reference numeral 53 denotes a chargeable secondary battery that supplies electrical energy for operation and control to the cardiac pacemaker as the implantable device 50, and is charged by a DC output of the power receiving rectifier circuit 60.
[0028]
Reference numeral 54 denotes a current monitoring resistor having a known resistance value for monitoring a charging current when the secondary battery 53 is charged. Since the internal impedance of the secondary battery 53 generally varies depending on the charging rate, in order to perform constant-current charging on the secondary battery 53, it is necessary to constantly and appropriately change the intensity of an AC electromagnetic field for charging. . The charging current value at this time can be converted from a potential difference generated between both ends of the current monitoring resistor 54.
[0029]
Reference numeral 55 denotes a main control circuit for monitoring various states of the cardiac pacemaker and for controlling the operation, and has a built-in microprocessor (MPU) and the like. Power for operating this circuit is supplied from the secondary battery 53.
[0030]
56 measures the voltage difference between the both ends of the current monitoring resistor 54 having a known resistance value as the voltage of the secondary battery 53 and the charging current at the time of charging, and determines the voltage of the secondary battery 53 based on those values. This is a charge monitoring control circuit for determining whether or not a predetermined value has been reached and generating a control signal or the like for further continuing or stopping the charging operation.
[0031]
57 transmits and modulates a carrier signal to transmit the output information from the charge monitoring control circuit 56 to the extracorporeal charger 1 by telemetry, and receives and demodulates a charge stop command and the like from the extracorporeal charger 1. It is a telemetry transmission / reception circuit.
[0032]
Reference numeral 58 denotes a transmission / reception antenna coil that transmits charging monitoring control information for telemetry from the implanted device 50 to the transmission / reception antenna coil 32 outside the body, and receives a charging stop command or the like transmitted from the outside of the body.
[0033]
The transmission signal from the charging monitoring control circuit 56 is transmitted from the transmitting / receiving antenna coil 58 to the outside of the body via the implanted device case 51 and the skin 70 of the living body, and is received by the telemetry signal transmitting / receiving antenna coil 32 outside the body.
[0034]
Reference numeral 33 denotes a telemetry transmission / reception circuit on the outside of the body, which demodulates a received telemetry signal and converts the demodulated telemetry signal into charge monitoring control information, or stops the charging operation by the charge control circuit 35 based on the charge monitoring control information. A circuit for monitoring and detecting abnormalities relating to charging is deactivated, and a charge stop command or the like is modulated and transmitted as a delemetry signal so that the control mode of the cardiac pacemaker may be shifted to a non-charging mode (normal mode). .
[0035]
Numeral 34 denotes an inverter control circuit for controlling the operation of the inverter circuit 20. When an abnormality related to charging is detected by the implanted cardiac pacemaker and the charging operation is continuously performed as charging monitoring control information, for example, When a situation is assumed in which the pacing output signal cannot be properly controlled in accordance with the electrocardiographic signal and the pacing output signal cannot be controlled, and the situation may be endangered, a request signal from the implantable device 50 to stop the charging operation. Is received, a control pulse to be applied to the gate is output to make it non-conductive in order to stop the operation of the switching transistors 21 to 24 of the inverter circuit 20.
[0036]
Reference numeral 35 denotes a charge control circuit, which is applied to the gate so as to increase the conduction period of the switching transistor 12 of the transformer circuit 10 when receiving, for example, a telemetry signal indicating that the charge current should be further increased as charge monitoring control information. Control the pulse to be applied.
[0037]
Reference numeral 36 denotes a display / alarm / operation circuit for monitoring the charge monitoring information of the secondary battery 53 in the implanted device on the extracorporeal charger 1 side and performing various necessary operations.
[0038]
In the extracorporeal charger 1 configured as described above, an AC electromagnetic field for charging is generated by the inverter circuit 20, and this AC electromagnetic field is generated by the inverter circuit 20 in a so-called burst in units of a certain period. Intermittent occurrences are controlled.
[0039]
FIG. 2 shows the relationship between the charge control operations of the devices 1 and 50 when charging the implantable device 50 (cardiac pacemaker) from the extracorporeal charger 1.
[0040]
Reference numeral 100 denotes an operation when charging from the extracorporeal charger 1 is not performed in the implantable device 50. Since no AC electromagnetic field for charging is generated in the extracorporeal charger 1, charging monitoring control or abnormal charging is performed. This is an operation in a non-charge mode in which it is not necessary to perform monitoring detection or the like, that is, an operation in a normal mode.
[0041]
Reference numeral 200 denotes an operation for exchanging information prior to the charging operation with the implantable device 50 when the implantable device 50 is charged from the extracorporeal charger 1 and in a state where no AC electromagnetic field for charging is generated. (Normal state) Telemetering is performed.
[0042]
Prior to the charging operation, information exchange between the implantable device 50 and the state of the non-charging mode operation 100 is performed as follows. First, an operation request signal (1) for telemetry for communication is transmitted from the extracorporeal charger 1 to the implantable device 50, and the implantable device 50 receives the request signal and sets a state where the telemetering operation is possible. By making a determination, a telemetering acceptable signal ((2)) is transmitted to the extracorporeal charger 1.
[0043]
Next, the extracorporeal charger 1 transmits a read request signal (3) to the implanted device 50, such as predetermined ID information such as a device type name, a serial number, and a battery model number, and implants the request signal. When the device 50 receives the information, the implantable device 50 searches for predetermined ID information given in advance for each implantable device 50, and uses the information as ID information of the implantable device 50 ((4)) or the like ((4)). Send to
[0044]
The extracorporeal charger 1 that has received the ID information of the implanted device 50 determines whether or not it is appropriate to perform the charging operation on the implanted device 50 based on the information, and determines whether the rechargeable battery 53 is embedded. Preparation for setting a unique charging characteristic according to the type of the device, etc., is performed, and a predetermined condition is met, and then a charging start command (5) is transmitted to the implanted device 50.
[0045]
FIG. 3 is a flowchart of the entire charging mode operation 101 in which the implantable device 50 that has received the charging start command from the extracorporeal charger 1 shifts and operates the non-charging mode operation that was being executed before receiving the command. Yes, control is performed in a circuit provided in the implantable device 50.
[0046]
Reference numeral 102 denotes a common monitoring / detection unit for monitoring the operation status of the implanted device 50 in the non-charge mode. The function range for monitoring and detecting the operation status of the device is commonly operated in the non-charge mode operation 100 and the charge mode operation 101.
[0047]
Upon receiving the charge start command {circle around (5)} from the extracorporeal charger 1, the common monitoring / detection unit 102 in the non-charge mode receives the strong AC electromagnetic field from outside the implantable device 50 to charge the secondary battery 53. The charging abnormality monitoring and detecting means 103 for monitoring and detecting whether or not an abnormality occurs is activated, and a charging control operation 104 for charging the secondary battery 53 is performed.
[0048]
In addition, the common monitoring / detection unit 102 in the non-charging mode sets a state (charge stop command receiving state) 114 in which reception of a charge stop command transmitted when the external charger 1 stops charging is possible (charge stop command receiving state). If the charging operation is not completed even if the charger 1 exceeds a predetermined charging period, the rechargeable battery 53 may be overcharged and the rechargeable battery 53 may be damaged. The timer 107 is started.
[0049]
In the charging control operation 104, an alternating electromagnetic field for charging transmitted from a charger outside the body is received by the power receiving coil 52, and the charge monitoring control circuit 56 supplies electric energy for charging the secondary battery 53. Perform operation for control.
[0050]
Reference numeral 105 denotes a battery charging information reading operation in which charging information such as a charging current value and a battery voltage value for the battery is sampled and detected at predetermined intervals during a charging operation period of the secondary battery 53 and the information is read. The operation is performed by operating the charge monitoring control circuit 56 from the potential generated in the current monitoring resistor 54 and the like.
[0051]
The read value of the charging information is transmitted as charging monitoring information 106 to the outside of the body by the telemetry transmitting / receiving circuit 57 and the transmitting / receiving antenna coil 58 as charging monitoring control information.
[0052]
If the charge information read value is out of a predetermined range, there is a concern that there is some abnormality related to charging. Is output.
[0053]
Reference numeral 107 denotes a charging period monitoring timer. When a charging start command {circle around (5)} is received from a charger outside the body, its activation is performed by the common monitoring and detection unit 102 in the non-charging mode.
[0054]
If the charging operation of the extracorporeal charger 1 does not end even after a predetermined charging period has elapsed, the charging period monitoring timer 107 outputs a time-out signal and sends a signal to that effect to the charging abnormality monitoring detecting means 103. At the same time, the invalid information 110 is generated as a request signal to the external charger 1 to stop the charging operation.
[0055]
The invalid information 110 is information that deviates from valid information that is within valid rules predetermined as battery charging information, and is transmitted to the extracorporeal charger 1 as charging monitoring information 106.
[0056]
In addition, the timeout signal from the charging period monitoring timer 107 performs the charging mode operation release setting 115 so that the implantable device 50 in the body ends the charging mode operation 101 and shifts to the non-charging mode operation 100 which is the normal mode operation. .
[0057]
Reference numeral 108 denotes an excessive current in the short-circuited portion when, for example, the secondary battery 53 is short-circuited or the diodes 61 to 64 or the smoothing capacitor 65 constituting the power receiving rectifier circuit 60 are short-circuited during charging. Is a temperature detecting means for detecting abnormal heat generation due to abnormal flow of heat. When detecting the predetermined temperature, the temperature detecting means 108 outputs a detection signal to that effect to the charging abnormality monitoring detecting means 103.
[0058]
Upon receiving the detection signal from the temperature detecting unit 108, the charging abnormality monitoring detecting unit 103 sends a command to perform the charging input disconnection control 112 input to the power receiving rectifier circuit 60, and performs the charging operation of the extracorporeal charger 1. Of the invalid information 110 is specified as a request to stop the process.
[0059]
111 is applied to the secondary battery 53 because if the voltage applied to the secondary battery 53 for charging is higher than a predetermined voltage value, the characteristics of the battery may be deteriorated or the battery may be damaged. The voltage is detected by the battery charge information reading operation 105, and the charge for suppressing the maximum value of the applied voltage is determined based on a signal transmitted to the charge abnormality monitoring and detection means 103 and the like.ElectricThis is a voltage limiter.
[0060]
114 is a charge stop command receiving means for receiving and receiving a charge stop command to be transmitted to the implantable device 50 when the extracorporeal charger 1 stops generating an AC electromagnetic field for charging and ends the charging operation. It operates only when the implanted device 50 is operating in the charging mode operation.
[0061]
The charge stop command accepting unit 114 performs a charge mode operation release setting 115 upon receiving a charge stop command from the external charger 1. As a result, the charging mode operation 101 ends, and the mode shifts to the non-charging mode operation 100.
[0062]
FIG. 4 is a flowchart of the entire charging operation in which the extracorporeal charger 1 operates after the extracorporeal charger 1 transmits the charging start command (5) to the implantable device 50. The control is performed by a circuit provided in the extracorporeal charger 1. Is executed.
[0063]
202 is an initial setting for performing charging based on a predetermined charging characteristic predetermined according to the type of the secondary battery 53 to be charged, and the like. After the setting, the inverter control circuit 34, the charging control circuit 35, Charger output control 205 based on charge monitoring information for appropriately operating the transformer circuit 10 and the inverter circuit 20 is performed, and a charge period monitoring timer 206 is started to monitor a predetermined charge period. .
[0064]
203 is a process of determining whether or not the received content of the charge monitoring control information transmitted from the implantable device 50 is the invalid information for requesting the stop of the charge control operation. If the content is a charge stop request, Based on the comparison 208 and 209 of the state of the charger output control 205 based on the charge monitoring information with the control process up to that point, the state shifts to the forced stop 210 or the normal stop 211.
[0065]
Reference numeral 204 denotes whether the charge monitoring information of the secondary battery 53 is within a predetermined specified parameter value range when the charge monitoring control information transmitted from the implantable device 50 is not invalid information for requesting the external charger 1 to stop charging. This is the process of judging whether or not it is out of the range, and the charger output control 205 based on the charge monitoring information is performed.
[0066]
When the charge monitoring information deviates from the designated parameter value, for example, the charge monitoring information 106 transmitted from the implanted device 50 is correctly transmitted, but the transmission / reception antenna coil 32 of the extracorporeal charger 1 transmits the transmission monitoring information 106 from another device. The charge monitoring information received by the telemetry transmission / reception circuit 33 may be erroneous due to the superimposition of the sudden noise.
[0067]
207 indicates whether or not the number of times that the state deviating from the specified parameter value is intermittently generated for charging is intermittently generated for each intermittent occurrence cycle of the alternating electromagnetic field for a predetermined number of times in order to cope with this. It is a judgment process.
[0068]
If the state of deviating from the parameter value continues for a predetermined number of times, there is a concern that the secondary battery 53 or the power receiving rectifier circuit 60 may be out of order. .
[0069]
If the state of deviating from the specified parameter value does not continue for the predetermined number of times, it is considered that the deviating of the specified parameter value is due to sudden superimposition of noise from another device.
[0070]
Thus, for example, the charger output control 205 is performed by replacing the received charge monitoring information from the implantable device 50 with the charge monitoring information corresponding to the previous intermittent generation period of the AC electromagnetic field generated intermittently for charging. .
[0071]
The charger output control 205 based on the charge monitoring information further determines whether or not a predetermined charge end condition according to the charge characteristics of the secondary battery 53 is met, and outputs a signal to that effect.
[0072]
When the predetermined charge termination condition is not satisfied, the state returns to the state of receiving the charge monitoring control information from the implanted device 50 transmitted thereafter by the collation determination 209. Further, when the predetermined charging termination condition is satisfied, the state shifts to a charging stop state 211 in which the charging operation is normally terminated by the collation determination 209.
[0073]
Reference numeral 212 denotes a forced stop switch provided in the display / alarm / operation circuit 36, which is a switch operated when the charging operation is intentionally stopped. When the forcible stop switch 212 is turned on, a state of the charge stop 210 is reached in which the charge is forcibly stopped.
[0074]
Also, when the charging period monitoring timer 206 started at the start of the charging operation outputs a time-out signal without terminating the charging operation for the predetermined monitoring period, the charging is stopped 210 forcibly stopping the charging.
[0075]
When the charging is stopped in any of the above 210 or 211, a charging stop command is transmitted to the implanted device 50, and the extracorporeal charger 1 executes the charging operation end 213 and obtains the result by telemetering prior to the charging operation. The predetermined ID information such as the model name and the serial number of the implanted device 50 and the model number of the secondary battery 53 is reset.
[0076]
FIG. 5 shows the charging characteristics and the contents of charge control of the secondary battery 53 embedded in the living body to supply electric energy to the device 50 implanted in the living body.
[0077]
As such a secondary battery 53, a solid-state battery using, for example, a lithium (Li 2) -based material having a large electric energy density per volume is desired in view of a demand for downsizing the device. For this, a method using a constant current is usually used.
[0078]
However, the charging characteristics of such a solid-state battery generally indicate that the voltage of the battery is increased by increasing the amount of charging energy. The internal impedance of the secondary battery varies depending on the number of repetitions, etc., even for a fixed amount of charging energy.
[0079]
That is, in charging (constant current charging) with a constant current value (Iconst), the voltage V_ERises with an increase in the charging period, but due to the difference in the internal impedance of the secondary battery, the voltage V_EAre different (in the figure, the voltage V when the internal impedance is small)_EAre shown as (1), and the characteristics when the internal impedance is large are shown as (2)).
[0080]
This means that the charging of the battery is considered to have been completed only when the predetermined voltage value (first voltage value, HV) is reached, and the energy amount sufficient to complete the charging is charged. I cannot judge it exactly.
[0081]
Then, after the voltage value of the battery reaches the first voltage value HV, if the charging (constant-voltage charging) is further performed while maintaining the first voltage value HV constant, the state where the battery was charged before that time is obtained. Accordingly, the charging current gradually decreases with time.
[0082]
The characteristic of (2) when the internal impedance of the battery is large is that the charging time to reach the voltage value HV is short and the energy charged during the constant current charging mode is smaller than when the internal impedance is small. During the period of the constant voltage charging mode in which the charging is performed with the voltage value set to HV, the charging rate at the end of the constant current charging mode is small. Smaller than ▼.
[0083]
Therefore, in the constant voltage charging mode after the charging in the constant current charging mode, the time during which the charging current value decreases to the predetermined charging current value Im is not significantly different from the difference in the internal impedance of the battery (Tch ▲). Together with 1) and Tch 2), the charging energy amount of the secondary battery, that is, the charging rate can be made substantially constant.
[0084]
The time for controlling the charging of the secondary battery 53 and ending the charging operation is indicated by Tch <1> and Tch <2>. It should be noted that the charging period monitoring means from the start of charging107It is well known that the timer set time Tout set by the timer 206 is set to an appropriate longer time than the end times Tch (1) and Tch (2) of the charging operation.
[0085]
Note that the charging applied voltage HV of the secondary battery 53 maintained in the constant voltage charging mode is a high voltage value based on the charging energy amount, which is substantially sufficient charging in the constant current charging mode. When a voltage value higher than the value HV by a predetermined voltage value, that is, a voltage value higher than the second voltage value HHV is applied to the battery, the secondary battery 53 may be overcharged or short-circuit failure may occur. Risk.
[0086]
FIG. 6 shows a charge application voltage suppression circuit 300 for preventing a high-potential voltage exceeding the second voltage value HHV from being applied to the battery in order to charge the secondary battery 53. Is provided between the output of the power receiving rectifier circuit 60 shown in FIG. 1 and the current monitoring resistor 54, a circuit capable of suppressing a voltage exceeding a predetermined potential.
[0087]
Reference numeral 301 denotes a charge application voltage suppression transistor, and an output voltage corresponding to the gate application voltage is applied to the secondary battery 53 through the current monitoring resistor 54. Reference numeral 305 denotes a Zener diode that generates a constant potential difference between the two terminals when a current flows from the cathode electrode to the anode electrode. The output of the transistor 301 is connected in series with the resistor 304 to reference the cathode electrode terminal voltage. Voltage.
[0088]
Reference numeral 309 denotes a differential amplifier. One input C of the differential amplifier is connected to a connection point where the output voltage of the transistor 301 is connected in series with the resistors 307 and 308, and the other input D is a cathode electrode of the Zener diode 305. It is connected to the intermediate terminal of the variable resistor 306 connected to the terminal.
[0089]
As a result, the differential amplifier 309 outputs a voltage value obtained by multiplying a reference voltage value based on the Zener diode 305 by a preset resistance value dividing ratio of the variable resistor 306 and an output voltage value of the transistor 301 by two resistors. The difference voltage from the voltage value divided by the ratio of the resistance values of 307 and 308 is amplified by the amplification factor A and output.
[0090]
However, since the output terminal of the differential amplifier 309 is connected to the source electrode of the transistor 302 via the resistor 310 and the diode 311, a voltage lower than the source electrode voltage is not applied to the gate electrode of the transistor 302.
[0091]
Since the gate electrode of the transistor 301 is connected to the drain electrode of the transistor 302, the resistance dividing ratio of the variable resistor 306 for applying to the input D of the differential amplifier 309 corresponds to the second voltage value HHV. Is set so as to be equal to the voltage value of the input C of the differential amplifier 309, so that even when the output of the power receiving rectifier circuit 60 is larger than the second voltage value HHV, a high voltage higher than the second voltage value HHV is applied Can be suppressed so as not to be applied.
[0092]
FIG. 7 shows the output voltage of the power receiving rectifier circuit 60 and the gate applied voltage V of the transistor 302._GAnd drain voltage V_DThe relationship is shown.
Since the output of the differential amplifier 309 is set to be equal to the voltage value of the other input C when the voltage value of the input D corresponds to the second voltage value HHV, the output of the differential rectifying circuit 60 The difference voltage between the output voltage and the second voltage value HHV is amplified.
[0093]
If the output voltage of the power receiving rectifier circuit 60 is higher than the second voltage value HHV, the output V_AMPIs a positive output proportional to the difference voltage, and if smaller than the second voltage value HHV, a negative output is proportional to the difference voltage.
[0094]
However, the output V of the differential amplifier 309_AMPIs negative, the output is connected to the negative electrode side of the secondary battery 53 in common with the source electrode of the transistor 302 via the resistor 310 and the diode 311, so that the diode 311 becomes conductive. And the output V of the differential amplifier 309_AMPBecomes zero potential.
[0095]
The output V of the differential amplifier 309 is applied to the gate electrode of the transistor 302._AMPIs applied. For this reason, when the output voltage of the power receiving rectifier circuit 60 is smaller than the second voltage value HHV, the transistor 302 is non-conductive, and the potential V_DIs substantially equal to the output voltage of the power receiving rectifier circuit 60 via the resistor 303.
[0096]
When the output voltage of the power receiving rectifier circuit 60 is higher than the second voltage value HHV, the transistor 302 conducts. However, the drain current flowing through the resistor 302 through the resistor 303 due to the conduction causes the transistor 302 to conduct. It is proportional to the difference voltage value between the output voltage of the circuit 60 and the second voltage value HHV.
[0097]
Therefore, the potential difference between both ends of the resistor 303 is proportional to the value of the drain current flowing in proportion to the degree of conduction of the transistor 302, and the potential V_DIs a potential obtained by subtracting the output voltage of the power receiving rectifier circuit 60 by a potential difference generated between both ends of the resistor 303.
[0098]
When the output voltage of the power receiving rectifier circuit 60 is higher than the second voltage value HHV, the potential V_DCan be set to a constant potential.
[0099]
FIG. 8 shows the output voltage of the power receiving rectifier circuit 60 and the source potential of the transistor 301, that is, the charging voltage V applied to the secondary battery 53 for charging._CHThe relationship is shown.
[0100]
The gate electrode of the transistor 301 is connected to the potential V of the drain electrode of the transistor 302._DIs applied, its source potential, that is, the charging voltage V_chIndicates that the output voltage of the power receiving rectifier circuit 60 from the low voltage value LV immediately after the start of charging of the secondary battery 53 to the second voltage value HHV is not suppressed and the power receiving rectifier exceeds the second voltage value. The output voltage of the circuit 60 can be controlled so that a charging voltage exceeding at least the second voltage value HHV is not applied to the secondary battery 53.
[0101]
FIG. 9 is an example of an AC voltage generated by the inverter circuit 20.₀The period of (for example, 2 seconds) is, for example, 10 KH_ZIs continuously generated in a burst manner, and the next T₁(For example, 0.5 seconds), the generation of the AC voltage is stopped,₀And T₁Is repeated alternately.
[0102]
Such an AC voltage is applied to the power transmission coil 31 for power transmission outside the body, and is received by the power receiving il 52 inside the body via the skin 70 of the living body and the implantable device case 51, and the AC generated by the received AC electromagnetic field. The voltage is converted to DC by the power receiving rectifier circuit 60 built in the implanted device, and T₀The secondary battery 53 is charged during the period.
[0103]
BookEmbodimentAccording to the above, in order to carry out cost charging by intermittently generating an AC electromagnetic field from the outside of the battery implanted in the living body, the implanting device in the living body is issued by a charge start command from the outside of the body. Charging abnormality monitoring detecting means, charging information monitoring means, charging energy control means to activate the charging energy suppressing means and transmit the charging monitoring control information of the internal battery to the outside of the body during the period in which the generation of the AC electromagnetic field for charging is stopped, By performing charging control based on that information, it is possible to accurately detect the occurrence of various abnormalities in implanted devices in the living body related to receiving the AC electromagnetic field for charging, and to use the extracorporeal charger. The charging operation stop request information can be transmitted. As a result, the charging operation of the battery implanted in the living body can be performed safely.
[0104]
Then, it is possible to easily perform the charging control in which the constant current charging is performed based on the voltage of the battery and the voltage is raised to a predetermined voltage and then the constant voltage charging is performed based on the voltage. There is no fear that a difference in charge amount occurs.
[0105]
【The invention's effect】
According to the present inventionBy transmitting a charge stop command from outside the body when the external charger stops charging operation, it is implanted in the living body.WasSince the device can release the charging mode operation and deactivate the means relating to the charging mode operation, the amount of execution processing required for controlling the implanted device can be reduced.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram of an embodiment of a cardiac pacemaker device of the present invention.
FIG. 2 is a block diagram showing a charge control operation of the living body implanted device and the extracorporeal charger according to the embodiment of the present invention.
FIG. 3 is a flowchart showing a charging mode operation according to the embodiment of the present invention.
FIG. 4 is a flowchart showing a charging operation according to the embodiment of the present invention.
FIG. 5 is a diagram showing charging characteristics and a charging method according to the embodiment of the present invention.
FIG. 6 is a circuit diagram of a charging energy suppression circuit according to the embodiment of the present invention.
FIG. 7 is a diagram showing characteristics of the charging energy suppression circuit according to the embodiment of the present invention.
FIG. 8 is a diagram showing characteristics of the charging energy suppression circuit according to the embodiment of the present invention.
FIG. 9 is a diagram illustrating a charging AC electromagnetic field (voltage) according to the embodiment of the present invention.
[Explanation of symbols]
1 extracorporeal charger
50 implanting equipment
53 rechargeable battery
55 Main control circuit
103 Charge abnormality detection means
104 Charge control operation
105 Battery charge information reading operation
106 Charge monitoring information
300 Charge energy suppression circuit

Claims (7)

A percutaneously receiving and charging an alternating electromagnetic field generated outside the body, and a living body implanting device including a secondary battery for supplying electric energy to a device to be implanted in a living body; And an extracorporeal charger for charging the secondary battery of the biological implantable device from outside the body,
  The living body implantation device,
    It has a charging mode for receiving charging to the secondary battery and a non-charging mode for not receiving charging,
    Receiving a charge start command from the extracorporeal charger, transition from the non-charge mode to the charge mode,
    Receiving a charge stop command from the extracorporeal charger, transition from the charging mode to the non-charging mode,
  The living body implanting device, wherein the charge stop command includes a charge stop command that is issued when the extracorporeal charger stops charging based on charge monitoring information received from the living body implanting device. 2. The living body implanting device according to claim 1, wherein the issuance of the charge stop command by the extracorporeal charger includes forced charging termination determined as abnormal charging and normal charging termination determined as normal charging. 3. The charging abnormality is received from the living body implanting device when the charging period monitoring timer that started timing at the time of issuing the charging start command has timed out, when the invalid information of the charge stop request is received from the living body implanting device, The living body implanting device according to claim 2, further comprising a case where the number of times that the value of the charging information of the secondary battery becomes out of the specified range is repeated a predetermined number of times. The living body implanted device, when a timeout of the charging period monitoring timer that started timing at the time of receiving the charging start command occurs, without waiting for the charging stop command from the extracorporeal charger, from the charging mode to the non-charging mode. The living body implanting device according to claim 1, wherein: The living body implanting device has temperature detecting means for detecting a temperature of the secondary battery and / or a charging circuit in the living body implanting device for charging the secondary battery, and the temperature detecting means detects a temperature abnormality. 2. The living body implanting device according to claim 1, wherein, when the charge input is detected, the charge input is cut off without waiting for the charge stop command from the extracorporeal charger. In a living body implanting device including a secondary battery that percutaneously receives and charges an AC electromagnetic field generated from an extracorporeal charger and supplies electric energy to a device implanted in a living body,
  It has a charging mode for receiving charging to the secondary battery and a non-charging mode for not receiving charging,
  Receiving a charge start command from the extracorporeal charger, transition from the non-charge mode to the charge mode,
  Receiving a charge stop command from the extracorporeal charger, transition from the charging mode to the non-charging mode,
  The living body implanting device, wherein the charge stop command includes a charge stop command issued upon determining that the extracorporeal charger stops charging based on the charge monitoring information transmitted to the extracorporeal charger. An extracorporeal charger that transmits an alternating electromagnetic field transcutaneously and charges the secondary battery of a biological implantable device from outside the body,
  Issue a percutaneous charge start command to the living body implanted device at the start of charging,
  An extracorporeal charger characterized by monitoring charge monitoring information received percutaneously from the living body implanting device and issuing a charge stop command transdermally to the living body implanting device when it is determined to stop charging.

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