# US 2025/0143918 A1 · Medical Pad and System for Thermotherapy > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0143918 A1 - Document ID: US20250143918A1 - Status: Published application - Kind: A1 - Application number: 19/018,774 - Filed: 2025-01-13 - Published: 2025-05-08 - Earliest claimed: 2015-01-27 - Assignees: Medivance Incorporated - Applicants: Medivance Incorporated - Inventors: Marc E. Voorhees; Michael R. Hoglund; Keir D. Hart - Web page: https://patentgrep.com/patent/US20250143918A1 ## CPC - A61F 7/00: Heating or cooling appliances for medical or therapeutic treatment of the human body (hyperthermia using electric or magnetic fields or ultrasound A61N) - A61F 7/02: Compresses or poultices for effecting heating or cooling - A61F 7/08: Warming pads, pans or mats; Hot-water bottles - A61F 7/10: Cooling bags, e.g. ice-bags - A61F 2007/0001: {Body part} - A61F 2007/0054: {with a closed fluid circuit, e.g. hot water} - A61F 2007/0056: {for cooling} - A61F 2007/0086: {with a thermostat} - A61F 2007/0093: {programmed} - A61F 2007/0096: {with a thermometer} - A61F 2007/0098: {ways of manufacturing heating or cooling devices for therapy} - A61F 2007/0226: {adhesive, self-sticking} - A61F 2007/0244: {with layers} - A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C) ## Abstract An improved medical pad for contact thermal exchange with a patient includes a fluid circulation layer for containing a thermal exchange fluid circulatable therethrough, a first port and a second port for circulating the thermal exchange fluid in to and out of the fluid circulation layer, and a hydrogel layer interconnected to and extending across one side of the fluid circulation layer to define an adhesive surface for adherence to a patient's skin. The hydrogel layer can include an ultraviolet light-cured composition with a cross-linking copolymer, water, and glycerol. The hydrogel layer is provided to have a thermal conductivity of at least about 1.9 cal/hr-cm-° C. ## Claims ### Claim 1 A patient temperature control system, comprising: a fluid conditioning assembly configured to cool, warm, and circulate a thermal exchange fluid throughout the system; a controller configured to operate the fluid conditioning assembly; one or more medical pads for thermal exchange with a patient, the one-or-more medical pads including: a fluid circulation layer for circulating the thermal exchange fluid therethrough; and a hydrogel layer over the fluid circulation layer defining an adhesive surface for adhering to skin of the patient, the hydrogel layer of an ultraviolet light-cured composition comprising a cross-linked copolymer and having a thermal conductivity of 1.9 cal/hr-cm-° C.; and a patient temperature sensor configured to sense patient temperature and provide a patient temperature signal indicative thereof to the controller for operating the fluid conditioning assembly. ### Claim 2 (depends on 1) The patient temperature control system according to claim 1, wherein the patient temperature sensor is configured to sense a core body temperature of the patient. ### Claim 3 (depends on 1) The patient temperature control system according to claim 1, further comprising a fluid temperature sensor configured to sense a fluid temperature of the thermal exchange fluid and provide a fluid temperature signal indicative thereof to the controller for operating the fluid conditioning assembly. ### Claim 4 (depends on 3) The patient temperature control system according to claim 3, the controller further comprising a programmable control module configured to generate control signals for a heat exchanger of the fluid conditioning system, thereby providing a desired temperature of the thermal exchange fluid for a target patient temperature. ### Claim 5 (depends on 3) The patient temperature control system according to claim 3, wherein each signal of the patient temperature signal and the fluid temperature signal is utilized by the programmable control module together with control data and preset algorithms to generate the control signals for the heat exchanger and provide the desired temperature of the thermal exchange fluid for the target patient temperature. ### Claim 6 (depends on 3) The patient temperature control system according to claim 3, the controller further comprising a graphic display configured to visually present a plot including an adjustment rate for a target patient temperature and the fluid temperature sensed by the fluid temperature sensor in corresponding time relation to the adjustment rate for the target patient temperature. ### Claim 7 (depends on 1) The patient temperature control system according to claim 1, wherein the ultraviolet light-cured composition includes: the cross-linked copolymer in an amount between about 15% to 30% by weight; water in an amount between about 15% to 40% by weight; and glycerol in an amount between about 25% to 35% by weight. ### Claim 8 (depends on 7) The patient temperature control system according to claim 7, wherein the cross-linked copolymer is in an amount between about 25% to 30% by weight in the ultraviolet light-cured composition. ### Claim 9 (depends on 8) The patient temperature control system according to claim 8, wherein the water is in an amount between about 25% to 35% by weight in the ultraviolet light-cured composition. ### Claim 10 (depends on 9) The patient temperature control system according to claim 9, wherein the glycerol is in an amount between about 27.5% to 32.5% by weight in the ultraviolet light-cured composition. ### Claim 11 (depends on 7) The patient temperature control system according to claim 7, wherein the ultraviolet light-cured composition includes the cross-linked copolymer in an amount of about 28% by weight. ### Claim 12 (depends on 11) The patient temperature control system according to claim 11, wherein the ultraviolet light-cured composition includes the water in an amount of about 34% by weight. ### Claim 13 (depends on 12) The patient temperature control system according to claim 12, wherein the ultraviolet light-cured composition includes the glycerol in an amount of about 30% by weight. ### Claim 14 (depends on 13) The patient temperature control system according to claim 13, wherein the ultraviolet light-cured composition includes potassium chloride in an amount of about 2% by weight. ### Claim 15 (depends on 14) The patient temperature control system according to claim 14, wherein the ultraviolet light-cured composition includes (poly) vinyl pyrrolidone in an amount of about 1.5% by weight. ### Claim 16 (depends on 1) The patient temperature control system according to claim 1, wherein the patient temperature sensor is configured to sense a core body temperature of the patient. ### Claim 17 (depends on 1) The patient temperature control system according to claim 1, wherein the cross-linked co-polymer comprises sodium 2-acyrylamido-2-methylpropanesulfonate and acrylic acid.