# US 10,441,458 B2 · 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 10,441,458 B2 - Document ID: US10441458B2 - Status: Granted - Kind: B2 - Application number: 15/035,062 - Filed: 2016-01-29 - Published: 2017-07-06 - Granted: 2019-10-15 - Earliest claimed: 2015-01-27 - Assignees: Medicance Incorporated - Applicants: Medivance Incorporated - Inventors: Marc E. Voorhees; Michael R. Hoglund; Keir David Hart - Web page: https://patentgrep.com/patent/US10441458B2 ## 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 comprises an ultra violet light-cured composition that includes a cross-linking copolymer in an amount of between about 15% to 30% by weight of the composition, water in an amount of between about 15% to 40% by weight of the composition, and glycerol in an amount of between about 25% to 35% by weight of the composition. The hydrogel layer is provided to have a thermal conductivity of at least about 1.9 ca/hr-cm-° C. ## Claims ### Claim 1 A medical pad for contact and thermal exchange with a patient, comprising: a fluid circulation layer for containing a thermal exchange fluid circulatable therethrough; a first port fluidly interconnected to the fluid circulation layer for circulating the thermal exchange fluid into the fluid circulation layer; a second port fluidly interconnected to the fluid circulation layer for circulating the thermal exchange fluid 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, wherein said hydrogel layer comprises an ultra violet light-cured composition that includes: a cross-linking copolymer in an amount of between about 15% to 30% by weight of said composition; water in an amount of between about 15% to 40% by weight of said composition; and, glycerol in an amount of between about 25% to 35% by weight of the composition; wherein said hydrogel layer has a thermal conductivity of at least about 1.9 cal/hr-cm-° C. ### Claim 2 (depends on 1) The medical pad recited in claim 1, wherein the ultra violet light-cured composition includes the cross-linking copolymer in an amount of between about 25% to 30% by weight of said composition; the water in an amount of between about 25% to 35% by weight of said composition; and the glycerol in an amount of between about 27.5% to 32.5% by weight of the composition. ### Claim 3 (depends on 1) The medical pad recited in claim 1, wherein said hydrogel layer has a thermal conductivity of between about 1.9 cal/hr-cm-° C. and 2.37 cal/hr-cm-° C. ### Claim 4 (depends on 1) The medical pad recited in claim 1, wherein said adhesive surface has a tack strength of between about 20 g and 65 g, as determined according to ISO 9665:1998(E). ### Claim 5 (depends on 4) The medical pad recited in claim 4, wherein said hydrogel layer has a thermal conductivity of between about 1.9 cal/hr-cm-° C. and 2.37 cal/hr-cm-° C. ### Claim 6 (depends on 1) The medical pad recited in claim 1, wherein the hydrogel layer has a thickness of between about 0.018″ and 0.04″. ### Claim 7 (depends on 6) The medical pad recited in claim 6, wherein the hydrogel layer has a thickness of between about 0.022″ and 0.032″. ### Claim 8 (depends on 1) The medical pad recited in claim 1, wherein said fluid circulation layer is defined by: a flexible film layer; and, a flexible base member interconnected to said film layer for containing the circulatable thermal exchange fluid in an internal volume defined therebetween, wherein said hydrogel layer has a thermal conductivity of at least about 1.9 cal/hr-cm-° C. ### Claim 9 (depends on 1) The medical pad as recited in claim 1, wherein said fluid circulation layer defines an internal volume having a geometric height across the fluid circulation layer of at least about 0.06″. ### Claim 10 (depends on 9) The medical pad as recited in claim 9, wherein said fluid circulation layer comprises: a flexible film layer; and, a flexible base member interconnected to said film layer for containing the circulatable thermal exchange fluid in an internal volume defined therebetween, wherein the flexible base member includes a plurality of rib members interconnected to the flexible film layer. ### Claim 11 (depends on 10) The medical pad as recited in claim 10, wherein the plurality of rib members define a plurality of fluid flow channels through the fluid circulation layer. ### Claim 12 (depends on 11) The medical pad as recited in claim 11, wherein the flow channels direct flow of the circulatable fluid flow between the inlet port and the outlet port. ### Claim 13 (depends on 10) The medical pad as recited in claim 10, wherein said rib members project from a base portion of the base member by a distance that defines said geometric height of the circulation layer. ### Claim 14 (depends on 13) The medical pad as recited in claim 13, wherein said projection distance is between about 0.06″ and 0.1″. ### Claim 15 (depends on 14) The medical pad as recited in claim 14, wherein said base member further includes a plurality of offset projections that project from the base portion of the base member by a distance substantially equal to said projection distance. ### Claim 16 (depends on 15) The medical pad as recited in claim 15, wherein said hydrogel layer has a thermal conductivity of between about 1.9 cal/hr-cm-° C. and 2.37 cal/hr-cm-° C. ### Claim 17 (depends on 16) The medical pad recited in claim 16, wherein said adhesive surface has a tack strength of between about 20 g and 65 g, as determined according to ISO 9665:1998(E). ### Claim 18 (depends on 17) The medical pad as recited in claim 17, wherein the ultra violet light-cured composition includes the cross-linking copolymer in an amount of between about 25% to 30% by weight of said composition; the water in an amount of between about 25% to 35% by weight of said composition; and the glycerol in an amount of between about 27.5% to 32.5% by weight of the composition. ### Claim 19 (depends on 18) The medical pad as recited in claim 18, wherein the hydrogel layer has a thickness of between about 0.022″ and 0.032″.