# US 11,896,837 B2 · Energy transfer control adapted to a medical device system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,896,837 B2 - Document ID: US11896837B2 - Status: Granted - Kind: B2 - Application number: 16/779,794 - Filed: 2020-02-03 - Published: 2021-02-11 - Granted: 2024-02-13 - Earliest claimed: 2007-11-27 - Applicants: Peter Forsell - Inventors: Peter Forsell - Web page: https://patentgrep.com/patent/US11896837B2 ## CPC - A61N 1/3787: {from an external energy source} - A61N 1/36125: {Details of circuitry or electric components} - A61N 1/37211: {Means for communicating with stimulators} - H02J 7/42: with electronic devices having internal batteries, e.g. mobile phones - H02J 7/02: for charging batteries from AC mains by converters - H02J 50/12: of the resonant type - H02J 50/80: involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices - H02J 2105/46: Medical devices, medical implants or life supporting devices - A61N: ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY (measurement of bioelectric currents A61B; surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body A61B18/00; anaesthetic apparatus in general A61M; incandescent lamps H01K; infrared radiators for heating H05B) - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY ## Abstract An apparatus adapted to transmit wireless energy from an external energy transmitting device placed externally to a human body to an internal energy receiver placed internally in the human body is disclosed. The apparatus comprises a first electric circuit to supply electrical pulses to the external transmitting device, said electrical pulses having leading and trailing edges. The electrical circuit is adapted to perform at least one of the following: vary the lengths of first time intervals between successive leading and trailing edges of the electrical pulses and/or the lengths of second time intervals between successive trailing and leading edges of the electrical pulses, and vary the first and second time intervals to have lengths in the range of, that are in the magnitude of order of or are shorter than, a time constant of the first electric circuit, and a relationship or proportion between the lengths of the first and second time intervals. The transmitting device is adapted to supply wireless energy to the internal energy receiver, wherein the wireless energy is generated from the electrical pulses having a varied power, the power depending on the lengths of the first and/or second time intervals. ## Claims ### Claim 1 An apparatus adapted to transmit wireless energy from an external energy transmitting device placed externally to a human body to an internal energy receiver placed internally in the human body, the apparatus comprising: a first electric circuit to supply electrical pulses to the external transmitting device, said electrical pulses having leading and trailing edges; wherein the first electrical circuit is adapted to perform at least one of the following: vary the lengths of first time intervals between successive leading and trailing edges of the electrical pulses and/or the lengths of second time intervals between successive trailing and leading edges of the electrical pulses, and vary the first and second time intervals to have lengths in the range of a time constant of the first electric circuit, and a relationship or proportion between the lengths of the first and second time intervals; and wherein the said external transmitting device is adapted to supply wireless energy to the internal energy receiver, wherein the wireless energy is generated from the electrical pulses and having a varied power, the power depending on the lengths of the first and/or second time intervals. ### Claim 2 (depends on 1) The apparatus of claim 1, wherein the first electrical circuit is adapted to keep the frequency of the electrical pulses substantial constant when the first and/or second time intervals are varied. ### Claim 3 (depends on 1) The apparatus of claim 1, wherein the first electrical circuit is adapted to keep the electrical pulses unchanged, except for varying the first and/or second time intervals. ### Claim 4 (depends on 1) The apparatus of claim 1, wherein the first electrical circuit is adapted to keep the amplitude of the electrical pulses substantial constant when the first and/or second time intervals are varied. ### Claim 5 (depends on 1) The apparatus of claim 1, wherein the first electrical circuit is adapted to vary the electrical pulses by only varying the lengths of first time intervals between successive leading and trailing edges of the electrical pulses. ### Claim 6 (depends on 5) The apparatus of claim 5, wherein the electrical pulses have a constant frequency. ### Claim 7 (depends on 5) The apparatus of claim 5, wherein the circuit formed by the first electric circuit and the external energy transmitting device has a first characteristic time period or first time constant, and adapted to effectively vary the transmitted energy, such frequency time period is in the range of the first characteristic time period or time constant or shorter. ### Claim 8 (depends on 1) The apparatus of claim 1, wherein the energy transmitter is further adapted to: supply a train of two or more electrical pulses in a row, wherein said train has a first electrical pulse at the start of the pulse train and has a second electrical pulse at the end of the pulse train, and supply two or more pulse trains in a row, wherein the lengths of the second time intervals between successive trailing edge of the second electrical pulse in a first pulse train and leading edge of the first electrical pulse of a second pulse train are varied. ### Claim 9 (depends on 8) The apparatus of claim 8, wherein the electrical pulses within the pulse trains have a constant frequency. ### Claim 10 (depends on 8) The apparatus of claim 8, wherein the circuit formed by the first electric circuit and the external energy transmitting device has a first characteristic time period or first time constant, and adapted to effectively vary the transmitted energy, such frequency time period is in the range of the first characteristic time period or time constant or shorter. ### Claim 11 (depends on 5, 8) The apparatus of claim 5 or 8, wherein the electrical pulses have a constant current and a constant voltage. ### Claim 12 (depends on 5, 8) The apparatus of claim 5 or 8, wherein the electrical pulses are adapted to cause an electromagnetic field over the external energy transmitting device, the electromagnetic field being varied by the varying of said first and second time intervals, and cause electromagnetic field electrical pulses in a receiver, the induced pulses carrying energy transmitted to the receiver. ### Claim 13 (depends on 12) The apparatus of claim 12, further adapted to transmit the wireless energy in an inductive way from the external energy source to the receiver. ### Claim 14 (depends on 5, 8) The apparatus of claim 5 or 8, further adapted to release the electrical pulses from the first electrical circuit with such a frequency and/or time period between leading edges of the consecutive pulses, so that when the lengths of the first and/or second time intervals are varied, the resulting transmitted energy are varied. ### Claim 15 (depends on 14) The apparatus of claim 14, wherein the electrical pulses have a constant frequency. ### Claim 16 (depends on 7, 10) The apparatus of claim 7 or 10, wherein the lengths of the first and/or the second time intervals are varied only within a range that includes the first characteristic time period or the first time constant or that is located relatively close to the first characteristic time period or the first time. constant, compared to the magnitude of the first characteristic time period or the first time constant. ### Claim 17 (depends on 7, 10) The apparatus of claim 7 or 10, wherein the energy transmission device is adapted to, when the lengths of the first time intervals are reduced, reduce the energy transmission. ### Claim 18 (depends on 7, 10) The apparatus of claim 7 or 10, wherein the energy transmission device is adapted to, when the lengths of the second time intervals are reduced, the increase the energy transmission. ### Claim 19 (depends on 1) The apparatus of claim 1, wherein the electrical pulses have a constant current and a constant voltage. ### Claim 20 (depends on 1) The apparatus of claim 1, wherein the electrical pulses have a constant frequency.