Patents by Inventor Francis Amoah
Francis Amoah has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11540880Abstract: An electrosurgical apparatus having a feed structure comprising a radiofrequency (RF) channel for conveying RF electromagnetic (EM) radiation from an RF signal generator to a probe and a microwave channel for conveying microwave EM radiation from a microwave signal generator to the probe, wherein the RF channel and microwave channel comprise physically separate signal pathways, wherein the feed structure includes a combining circuit having an input connected to the signal pathway on the RF channel, another input connected to the signal pathway on the microwave channel, and an output connected to a common signal pathway for conveying the RE EM radiation and EM radiation separately or simultaneously to the probe, and wherein the microwave channel includes a waveguide isolator connected to isolate the signal pathway on the microwave channel from the RF EM radiation.Type: GrantFiled: July 19, 2018Date of Patent: January 3, 2023Assignee: CREO MEDICAL LIMITEDInventors: Christopher Paul Hancock, Malcolm White, Francis Amoah, Nuwan Dharmisiri
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Patent number: 11090116Abstract: An electrosurgical waveform having both radiofrequency (RF) energy and microwave energy components that is arranged to perform efficient haemostasis in biological tissue. The waveform comprises a first portion primarily of RF electromagnetic energy, and a second portion primarily of microwave electromagnetic energy that follows the first portion. The second portion further comprises a plurality of RF pulses, wherein the first portion transitions to the second portion when either a duration of the first portion meets or exceeds a predetermined duration threshold, or an impedance determined during the first portion meets or exceeds a predetermined threshold. The waveform is arranged to deliver energy rapidly so that haemostasis can occur in a short time frame in a situation where the maximum available power is limited, or to avoid undesirable thermal damage to the biological tissue.Type: GrantFiled: May 19, 2017Date of Patent: August 17, 2021Assignee: CREO MEDICAL LIMITEDInventors: Christopher Paul Hancock, Francis Amoah, Martin Jarman
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Patent number: 10898172Abstract: A biopsy forceps tool (preferably for endoscopic use) in which microwave energy is used to coagulate bleeding after a biological tissue sample is collected between a pair of jaws. The pair of jaws define an enclosure that is isolated from the microwave energy itself and insulated from any thermal changes that occur due to application of the microwave energy. The tool comprises a pair of jaws connected to a coaxial cable, each of the pair of jaws comprising an electrically conductive shell, the jaw assembly being movable between a closed position in which the electrically conductive shells enclose an internal volume for holding a tissue sample and an open position in which the internal volume is exposed in order to receive the tissue sample. The electrically conductive shells form a Faraday cage around the internal volume when in the closed position.Type: GrantFiled: September 30, 2016Date of Patent: January 26, 2021Assignee: CREO MEDICAL LIMITEDInventors: Christopher Hancock, Francis Amoah, Malcolm White, Thomas Craven, Brian Saunders, Zacharias P. Tsiamoulos
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Patent number: 10820937Abstract: An electrosurgical instrument which is capable of selective operation in any of (i) a plasma-generating mode for surface coagulation, (ii) a non-ionising radiation mode for deeper coagulation, e.g. using microwave energy, and (iii) a liquid administration mode for conveying liquid to a treatment site, e.g. to constrict a bleeding vessel so that a clinician can get control of the bleed. These operating modes may be provided in an electrosurgical instrument that is physically configured to be suitable for applying pressure to a tissue vessel, e.g. to act as a tamponade to stem bleeding.Type: GrantFiled: March 2, 2017Date of Patent: November 3, 2020Assignee: CREO MEDICAL LIMITEDInventors: Christopher Paul Hancock, Shaun Preston, Francis Amoah, Malcolm White, Zacharias Tsiamoulos, Brian Saunders
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Patent number: 10610284Abstract: An electrosurgical apparatus comprising an electrosurgical instrument for delivering RF energy and/or microwave frequency energy into biological tissue, an interference cable for conveying radiofrequency (RF) and/or microwave frequency energy between an electrosurgical generator and the electrosurgical instrument, wherein a sterile barrier sheath surrounds a connection interface between the instrument and interface cable. The sterile barrier sheath and instrument may be a sterilisable unit suitable for repeated use.Type: GrantFiled: July 20, 2015Date of Patent: April 7, 2020Assignee: CREA MEDICAL LIMITEDInventors: Christopher Paul Hancock, Francis Amoah, Julian Mark Ebbutt, Jeremy Paul Gardner, Robin Alexander Crossley, Rohan Monico
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Patent number: 10426542Abstract: A pulsed RF cut waveform profile for electrosurgery, in which each pulse is formed of a composite of different pulse portions. The pulse includes a controllable treatment portion whose duration can be truncated as necessary to ensure that the average power delivered by the pulse as a whole does not exceed a predetermined value. A limit for the average power delivered by the composite pulse (i.e. total energy delivered over the duration of the ON and OFF portions divided by the pulse duration) may be selectable by the operator. The ON portion may have multiple sub-portions, which have different purposes. Each pulse may be automatically controlled for pulse width in this manner, so that the RF signal effectively responds intelligently to conditions at the probe tip during treatment.Type: GrantFiled: April 14, 2014Date of Patent: October 1, 2019Assignee: CREO MEDICAL LIMITEDInventors: Francis Amoah, Christopher Paul Hancock, Martin Jarman, Nuwan Dharmisiri
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Patent number: 10299850Abstract: A method of controlling RF power delivered from a bipolar electrosurgical instrument into a biological tissue. The method comprises controlling the profile of a RF waveform by: setting a maximum voltage limit for a voltage applied across the bipolar electrosurgical instrument; calculating a tissue resistance, the calculating step including a correction for an impedance associated with the RF channel; determining an objective tissue current limit from the calculated tissue resistance and a predetermined power dissipation target; and dynamically adjusting the current limit based on the determined objective tissue current limit. This control method may ameliorate the impact of an increased cable length on the accuracy of control of RF waveforms delivered to the tip of the probe.Type: GrantFiled: April 14, 2014Date of Patent: May 28, 2019Assignee: CREO MEDICAL LIMITEDInventors: Francis Amoah, Christopher Paul Hancock, Martin Jarman, Nuwan Dharmisiri
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Publication number: 20190125442Abstract: An electrosurgical waveform having both radiofrequency (RF) energy and microwave energy components that is arranged to perform efficient haemostasis in biological tissue. The waveform comprises a first portion primarily of RF electromagnetic energy, and a second portion primarily of microwave electromagnetic energy that follows the first portion. The second portion further comprises a plurality of RF pulses, wherein the first portion transitions to the second portion when either a duration of the first portion meets or exceeds a predetermined duration threshold, or an impedance determined during the first portion meets or exceeds a predetermined threshold. The waveform is arranged to deliver energy rapidly so that haemostasis can occur in a short time frame in a situation where the maximum available power is limited, or to avoid undesirable thermal damage to the biological tissue.Type: ApplicationFiled: May 19, 2017Publication date: May 2, 2019Inventors: Christopher Paul HANCOCK, Francis AMOAH, Martin JARMAN
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Publication number: 20190083159Abstract: An electrosurgical instrument which is capable of selective operation in any of (i) a plasma-generating mode for surface coagulation, (ii) a non-ionising radiation mode for deeper coagulation, e.g. using microwave energy, and (iii) a liquid administration mode for conveying liquid to a treatment site, e.g. to constrict a bleeding vessel so that a clinician can get control of the bleed. These operating modes may be provided in an electrosurgical instrument that is physically configured to be suitable for applying pressure to a tissue vessel, e.g. to act as a tamponade to stem bleeding.Type: ApplicationFiled: March 2, 2017Publication date: March 21, 2019Inventors: Christopher Paul HANCOCK, Shaun PRESTON, Francis AMOAH, Malcolm WHITE, Zacharias TSIAMOULOS, Brian SAUNDERS
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Publication number: 20180353162Abstract: A biopsy forceps tool (preferably for endoscopic use) in which microwave energy is used to coagulate bleeding after a biological tissue sample is collected between a pair of jaws. The pair of jaws define an enclosure that is isolated from the microwave energy itself and insulated from any thermal changes that occur due to application of the microwave energy. The tool comprises a pair of jaws connected to a coaxial cable, each of the pair of jaws comprising an electrically conductive shell, the jaw assembly being movable between a closed position in which the electrically conductive shells enclose an internal volume for holding a tissue sample and an open position in which the internal volume is exposed in order to receive the tissue sample. The electrically conductive shells form a Faraday cage around the internal volume when in the closed position.Type: ApplicationFiled: September 30, 2016Publication date: December 13, 2018Inventors: Christopher HANCOCK, Francis AMOAH, Malcolm WHITE, Thomas CRAVEN, Brian SAUNDERS, Zacharias P. TSIAMOULOS
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Publication number: 20180344400Abstract: An electrosurgical apparatus having a feed structure comprising a radiofrequency (RF) channel for conveying RF electromagnetic (EM) radiation from an RF signal generator to a probe and a microwave channel for conveying microwave EM radiation from a microwave signal generator to the probe, wherein the RF channel and microwave channel comprise physically separate signal pathways, wherein the feed structure includes a combining circuit having an input connected to the signal pathway on the RF channel, another input connected to the signal pathway on the microwave channel, and an output connected to a common signal pathway for conveying the RE EM radiation and EM radiation separately or simultaneously to the probe, and wherein the microwave channel includes a waveguide isolator connected to isolate the signal pathway on the microwave channel from the RF EM radiation.Type: ApplicationFiled: July 19, 2018Publication date: December 6, 2018Inventors: Christopher Paul Hancock, Malcolm White, Francis Amoah, Nuwan Dharmisiri
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Patent number: 10080609Abstract: An electrosurgical apparatus having a feed structure comprising a radiofrequency (RF) channel for conveying RF electromagnetic (EM) radiation from an RF signal generator to a probe and a microwave channel for conveying microwave EM radiation from a microwave signal generator to the probe, wherein the RF channel and microwave channel comprise physically separate signal pathways, wherein the feed structure includes a combining circuit having an input connected to the signal pathway on the RF channel, another input connected to the signal pathway on the microwave channel, and an output connected to a common signal pathway for conveying the RE EM radiation and EM radiation separately or simultaneously to the probe, and wherein the microwave channel includes a waveguide isolator connected to isolate the signal pathway on the microwave channel from the RF EM radiation.Type: GrantFiled: September 16, 2013Date of Patent: September 25, 2018Assignee: CREO MEDICAL LIMITEDInventors: Christopher Paul Hancock, Malcolm White, Francis Amoah, Nuwan Dharmisiri
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Patent number: 9925372Abstract: Apparatus (100) and method are disclosed for removing or reducing the number of particles in an enclosed atmosphere during intracorporeal procedures. The apparatus comprises a housing (180) adapted to be placed against the body on which a procedure is to be formed, a first electrode (140) external to the housing for contacting the body, an elongated electrically insulated probe (130) extending from the housing (180) and being insertable into an intracorporeal body cavity (C) in which a procedure is to be performed, a second electrode (150) at the free end of the probe, and circuit means (110) for generating voltage between said first and second electrodes. The method comprises applying a voltage between the electrodes sufficient to cause local ionization of particles within the body cavity such that they migrate away from the second electrode, thereby removing or reducing the number of particles generated during the procedure from the enclosed atmosphere at or around the site of the procedure.Type: GrantFiled: September 5, 2012Date of Patent: March 27, 2018Assignee: ASALUS MEDICAL INSTRUMENTS LIMITEDInventors: Francis Amoah, Dominic Griffiths
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Publication number: 20170143404Abstract: An electrosurgical apparatus comprising an electrosurgical instrument for delivering RF energy and/or microwave frequency energy into biological tissue, an interference cable for conveying radiofrequency (RF) and/or microwave frequency energy between an electrosurgical generator and the electrosurgical instrument, wherein a sterile barrier sheath surrounds a connection interface between the instrument and interface cable. The sterile barrier sheath and instrument may be a sterilisable unit suitable for repeated use.Type: ApplicationFiled: July 20, 2015Publication date: May 25, 2017Applicant: CREO MEDICAL LIMITEDInventors: Christopher Paul HANCOCK, Francis AMOAH, Julian Mark EBBUTT, Jeremy Paul GARDNER, Robin Alexander CROSSLEY, Rohan MONICO
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Publication number: 20160120588Abstract: A pulsed RF cut waveform profile for electrosurgery, in which each pulse is formed of a composite of different pulse portions. The pulse includes a controllable treatment portion whose duration can be truncated as necessary to ensure that the average power delivered by the pulse as a whole does not exceed a predetermined value. A limit for the average power delivered by the composite pulse (i.e. total energy delivered over the duration of the ON and OFF portions divided by the pulse duration) may be selectable by the operator. The ON portion may have multiple sub-portions, which have different purposes. Each pulse may be automatically controlled for pulse width in this manner, so that the RF signal effectively responds intelligently to conditions at the probe tip during treatment.Type: ApplicationFiled: April 14, 2014Publication date: May 5, 2016Applicant: CREO MEDICAL LIMITEDInventors: Francis AMOAH, Christopher Paul HANCOCK, Martin JARMAN, Nuwan DHARMISIRI
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Publication number: 20160074091Abstract: A method of controlling RF power delivered from a bipolar electrosurgical instrument into a biological tissue. The method comprises controlling the profile of a RF waveform by: setting a maximum voltage limit for a voltage applied across the bipolar electrosurgical instrument; calculating a tissue resistance, the calculating step including a correction for an impedance associated with the RF channel; determining an objective tissue current limit from the calculated tissue resistance and a predetermined power dissipation target; and dynamically adjusting the current limit based on the determined objective tissue current limit. This control method may ameliorate the impact of an increased cable length on the accuracy of control of RF waveforms delivered to the tip of the probe.Type: ApplicationFiled: April 14, 2014Publication date: March 17, 2016Inventors: Francis AMOAH, Christopher Paul HANCOCK, Martin JARMAN, Nuwan DHARMISIRI
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Publication number: 20150238257Abstract: An electrosurgical apparatus having a feed structure comprising a radiofrequency (RF) channel for conveying RF electromagnetic (EM) radiation from an RF signal generator to a probe and a microwave channel for conveying microwave EM radiation from a microwave signal generator to the probe, wherein the RF channel and microwave channel comprise physically separate signal pathways, wherein the feed structure includes a combining circuit having an input connected to the signal pathway on the RF channel, another input connected to the signal pathway on the microwave channel, and an output connected to a common signal pathway for conveying the RE EM radiation and EM radiation separately or simultaneously to the probe, and wherein the microwave channel includes a waveguide isolator connected to isolate the signal pathway on the microwave channel from the RF EM radiation.Type: ApplicationFiled: September 16, 2013Publication date: August 27, 2015Inventors: Christopher Paul Hancock, Malcolm White, Francis Amoah, Nuwan Dharmisiri
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Publication number: 20140228836Abstract: Apparatus (100) and method are disclosed for removing or reducing the number of particles in an enclosed atmosphere during intracorporeal procedures. The apparatus comprises a housing (180) adapted to be placed against the body on which a procedure is to be formed, a first electrode (140) external to the housing for contacting the body, an elongated electrically insulated probe (130) extending from the housing (180) and being insertable into an intracorporeal body cavity (C) in which a procedure is to be performed, a second electrode (150) at the free end of the probe, and circuit means (110) for generating voltage between said first and second electrodes. The method comprises applying a voltage between the electrodes sufficient to cause local ionisation of particles within the body cavity such that they migrate away from the second electrode, thereby removing or reducing the number of particles generated during the procedure from the enclosed atmosphere at or around the site of the procedure.Type: ApplicationFiled: September 5, 2012Publication date: August 14, 2014Applicant: ASALUS MEDICAL INSTRUMENTS LIMITEDInventors: Francis Amoah, Dominic Griffiths
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Patent number: 8585694Abstract: An electrosurgical generator for coagulating tissue comprises a source of radio frequency (RF) energy, and at least a pair of output terminals for connection to a bipolar electrosurgical instrument adapted to contact tissue, the output terminals delivering RF energy from the source to the instrument such that the source delivers RF energy into tissue. The generator also includes boiling detection means for determining when the RF energy starts to cause the boiling of electrolytes within the tissue. A timer is adapted to determine when a predetermined period of time has elapsed since the boiling detection means has indicated the start of the boiling of electrolytes. An indication means gives an indication when the predetermined period of time has elapsed.Type: GrantFiled: May 4, 2010Date of Patent: November 19, 2013Assignee: Gyrus Medical LimitedInventors: Francis Amoah, Wayne Williams
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Patent number: D700318Type: GrantFiled: May 14, 2012Date of Patent: February 25, 2014Assignee: Asalus Medical Instruments LimitedInventors: Francis Amoah, Dominic Griffiths