EP0168483A1 - Multi-layer disposable medical thermal blanket - Google Patents

Multi-layer disposable medical thermal blanket

Info

Publication number
EP0168483A1
EP0168483A1 EP85900886A EP85900886A EP0168483A1 EP 0168483 A1 EP0168483 A1 EP 0168483A1 EP 85900886 A EP85900886 A EP 85900886A EP 85900886 A EP85900886 A EP 85900886A EP 0168483 A1 EP0168483 A1 EP 0168483A1
Authority
EP
European Patent Office
Prior art keywords
fluid
thermal
thermal blanket
path
application
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP85900886A
Other languages
German (de)
French (fr)
Other versions
EP0168483A4 (en
Inventor
David Franklin Bailey
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0168483A1 publication Critical patent/EP0168483A1/en
Publication of EP0168483A4 publication Critical patent/EP0168483A4/en
Withdrawn legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • 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
    • A61F7/00—Heating or cooling appliances for medical or therapeutic treatment of the human body
    • A61F7/02—Compresses or poultices for effecting heating or cooling
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • 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
    • A61F7/00—Heating or cooling appliances for medical or therapeutic treatment of the human body
    • A61F2007/0054—Heating or cooling appliances for medical or therapeutic treatment of the human body with a closed fluid circuit, e.g. hot water

Definitions

  • a multi-layer disposable medical thermal blanket for heating or cooling selected areas of a patient's body.
  • Numerous devices have been developed to provide a temperature controlled pad or blanket to be applied to a selected area of a patient's body.
  • a thermal blanket or pad it is important to prevent or minimize the accumulation of moisture, enhance the retention of thermal energy to the selected area of application and avoid pinching off the fluid conduits and thus the fluid should the thermal blanket or pad become folded.
  • thermal pads comprise a pliable vinyl, having a continuous, serpentine conduit formed therein to circulate a heated or cooled liquid therethrough.
  • thermal blankets disclose highly absorbent covering which act as a temperature control applicator.
  • the present invention relates to a multi-layer disposable medical thermal blanket for controlling body temperature by either heating or cooling a select area of application on patient's body.
  • the thermal blanket comprises an inner bladder having a highly moisture absorbent fiber layer and a moisture-proof layer disposed on opposite sides thereof.
  • the inner bladder comprises a pair of bladder elements sealed together to form a plurality of fluid conduits therebetween, including an outer primary and inner, secondary fluid path and a matrix of thermal application channels.
  • the outer primary fluid path comprises an outer primary fluid supply and return path in fluid exchanging relationship relative to each other disposed about the outer periphery of the thermal blanket.
  • the inner secondary fluid path comprises an inner secondary fluid supply and return path in fluid exchanging relationship relative to each other disposed inwardly relative to the outer primary fluid path.
  • the outer primary fluid supply and return extend substantially the length of the thermal blanket while the inner secondary fluid supply and return path extend substantially one-half the length of the thermal blanket.
  • Extending substantially perpendicular to the outer primary and inner secondary fluid paths is a matrix of thermal application channels to circulate fluid therethrough between the supply and return paths.
  • the highly appropriate fabric layer is used for the heating application and may be moistened to further enhance the thermal conductivity through the inner bladder to the patient's body.
  • the moist-proof layer is used for cooling application.
  • the thermal blanket is coupled to a fluid heating and cooling circulating source.
  • the fluid As the fluid is circulated into the thermal blanket, it simultaneously enters the outer primary fluid supply path and inner secondary fluid supply path and is forced longitudinally down the thermal blanket.
  • the fluid then enters the inner portion of the matrix of thermal channels.
  • FIG 1 is a top view of the multi-layer disposable medical thermal blanket.
  • FIG 2 is a cross-sectional end view of the multi-layer disposable medical thermal blanket taken along line 2-2 or FIG 1.
  • the present invention relates to a multi-layer disposable medical thermal blanket generally indicated as 10 for controlling body temperature by either heating or cooling a select area of application on the patient's body.
  • the thermal blanket 10 comprises an inner bladder having a highly moisture absorbent fiber layer and a moisture-proof layer disposed on opposite sides thereof generally indicated as 12, 14, and 16 respectively.
  • the inner bladder 12 comprises a pair of bladder elements 18 and 20 sealed together to form a plurality of fluid conduits therebetween.
  • the fluid conduits comprise an outer primary and inner secondary fluid path and a matrix of thermal application channels.
  • the outer primary fluid path comprises an outer primary fluid supply path 22 and an outer primary fluid return path 24 in fluid exchanging relationship relative to each other disposed about the outer periphery of the thermal blanket 10.
  • the inner secondary fluid path comprises an inner secondary fluid supply path 26 and an inner secondary fluid return path 28 in fluid exchanging relationship realtive to each other disposed inwardly relative to the outer primary fluid path.
  • the outer primary fluid supply path 22 and outer primary fluid return path 24 extend substantially the length of the thermal blanket 10 while the inner secondary fluid supply path 26 and inner secondary fluid return path 28 extend substantially one half the length of the thermal blanket.
  • the cross sectional area of the primary fluid path is substantially greater than the secondary fluid path and thermal application channels to permit the primary fluid path to expand outwardly from the sufrace of the thermal blanket 10 under the fluid pressure as the fluid is circulated through the thermal blanket 10 to effectively form a seal with the patient's body at the selected area of application to retain the thermal energy to the applied area when in the cooling mode with the moisture-proof layer adjacent the patient's body.
  • Layer 16 comprises a flexible sheet of closed cell foam formed by a plurality of discontinuous voids.
  • Extending substantially perpendicular to the outer primary and inner secondary fluid paths is a matrix of thermal application channels each indicated as 30.
  • a matrix of thermal application channels each indicated as 30.
  • the thermal applicatin channels 30 have interrupted ribs 32 on opposite sides thereof forming cross channels 33 thus permitting communication between adjacent thermal application channels 30 to more evenly distribute the pressure over the entire thermal blanket 10.
  • the inner secondary fluid path includes an interrupted rib and stops 34 and 36 respectively. Adjacent segments 38 of the interrupted ribs 34 cooperatively form secondary fluid path channels each indicated as 40.
  • the outer primary fluid path includes an interrupted rib 42 having supplemental fluid channel 44 in communication with -the secondary fluid path and a plurality of primary fluid path channels each indicated as 46 on the outer portions thereof formed by adjacent segments 48.
  • the highly absorbent fabric layer 14 is used for the heating application and may be moistened to further enhance the thermal conductivity through the inner bladder 12 to the patient's body.
  • the thermal blanket 10 is coupled to a fluid heating and cooling circulating source by inlet supply conduit and outlet supply conduit 50 and 52 respectively.
  • inlet supply conduit 50 As the fluid is circulated into the thermal blanket 10 through inlet supply conduit 50, it simultaneously enters the outer primary fluid supply path 22 and inner secondary fluid supply path 26 and is forced longitudinally through the thermal blanket 10.
  • the fluid enters the inner portion of the matrix of thermal channels 30 through the secondary fluid path channels 40.
  • the inner portion of the matrix of thermal application channels 30 are supplemented by fluid passing through the supplemental fluid path channel 44 formed in the interrupted rib 42. Fluid is supplied to the outer portion of the thermal blanket 10 through the plurality of primary fluid path channels 46 forming the outer portion of the interrupted rib 42.

Abstract

Une couverture thermique médicale jetable à couches multiples (10) permettant de réguler la température du corps soit en chauffant soit en refroidissant des zones sélectionnées d'application comprend une vessie interne (12) formant un conduit matriciel pour un fluide de circulation et ayant une couche de tissu de haute absorption (14) formée sur une surface de celle-ci pour améliorer la thermo-conduction et une couche imperméable à l'humidité (16) formée sur sa surface opposée pour inhiber la condensation sur celle-ci, la conduite matricielle comprenant un chemin de fluide primaire externe (22/24) disposé autour de la périphérie externe de la couverture thermique et un chemin de fluide secondaire interne (26/28), le chemin de fluide primaire externe (22/24) étant élargi par rapport au chemin de fluide secondaire interne (26/28) pour former une barrière avec la zone d'application du corps du patient et retenir l'énergie thermique sur la zone appliquée en formant une barrière d'humidité et une pluralité de canaux de thermo-application (30) disposés perpendiculairement aux chemins de fluide primaire externe (22/24) et secondaire interne (26/28) pour application sur le corps du patient.A disposable multi-layer medical thermal blanket (10) for regulating body temperature either by heating or cooling selected areas of application includes an internal bladder (12) forming a matrix duct for circulating fluid and having a layer high absorption fabric (14) formed on a surface thereof to improve heat conduction and a moisture impermeable layer (16) formed on its opposite surface to inhibit condensation thereon, the matrix conduct comprising an external primary fluid path (22/24) disposed around the outer periphery of the thermal blanket and an internal secondary fluid path (26/28), the external primary fluid path (22/24) being widened relative to the internal secondary fluid path (26/28) to form a barrier with the application area of the patient's body and retain thermal energy on the applied area by forming a moisture barrier and a plurality of heat application channels (30) arranged perpendicular to the external primary (22/24) and internal secondary (26/28) fluid paths for application to the patient's body.

Description

HϋlrTI- AYE -DISPOSABLE -MEBIC-AL TgERMAL--BLANKET
Backgroun -of- the--Invention
A multi-layer disposable medical thermal blanket for heating or cooling selected areas of a patient's body.
Numerous devices have been developed to provide a temperature controlled pad or blanket to be applied to a selected area of a patient's body. In designing such a thermal blanket or pad it is important to prevent or minimize the accumulation of moisture, enhance the retention of thermal energy to the selected area of application and avoid pinching off the fluid conduits and thus the fluid should the thermal blanket or pad become folded.
Often such thermal pads comprise a pliable vinyl, having a continuous, serpentine conduit formed therein to circulate a heated or cooled liquid therethrough. Other examples of such thermal blankets disclose highly absorbent covering which act as a temperature control applicator.
Examples representative of the prior art are found in ϋ. S. 2,110,022; ϋ. S. 2,726,658; U. S. 3,463,161; 0. S. 3,867,939; ϋ. S. 3,871,376; ϋ. S. 3,871,381; ϋ. S. 4,114,620; and ϋ. S. 4,149,541.
Summary of— h -Invention
The present invention relates to a multi-layer disposable medical thermal blanket for controlling body temperature by either heating or cooling a select area of application on patient's body. As described more fully hererinafter, the thermal blanket comprises an inner bladder having a highly moisture absorbent fiber layer and a moisture-proof layer disposed on opposite sides thereof.
The inner bladder comprises a pair of bladder elements sealed together to form a plurality of fluid conduits therebetween, including an outer primary and inner, secondary fluid path and a matrix of thermal application channels. More specifically, the outer primary fluid path comprises an outer primary fluid supply and return path in fluid exchanging relationship relative to each other disposed about the outer periphery of the thermal blanket. The inner secondary fluid path comprises an inner secondary fluid supply and return path in fluid exchanging relationship relative to each other disposed inwardly relative to the outer primary fluid path. The outer primary fluid supply and return extend substantially the length of the thermal blanket while the inner secondary fluid supply and return path extend substantially one-half the length of the thermal blanket.
Extending substantially perpendicular to the outer primary and inner secondary fluid paths is a matrix of thermal application channels to circulate fluid therethrough between the supply and return paths.
The highly appropriate fabric layer is used for the heating application and may be moistened to further enhance the thermal conductivity through the inner bladder to the patient's body. The moist-proof layer is used for cooling application.
In operation, the thermal blanket is coupled to a fluid heating and cooling circulating source. As the fluid is circulated into the thermal blanket, it simultaneously enters the outer primary fluid supply path and inner secondary fluid supply path and is forced longitudinally down the thermal blanket. The fluid then enters the inner portion of the matrix of thermal channels. As fluid passes through the matrix of thermal application channels, it is fed into the inner secondary return path and outer primary fluid return path and returned to the circulating source.
The invention accordingly comprises the features of construction, combination of elements, and arrangement of parts that will be exemplified in the construction hereinafter set forth, and the scope of the invention will be indicated in the claims.
Brief-D scriptio of-the-ef -the--D-caw-i-ncrs-
For a fuller understanding of the nature and objects of the invention, reference should be had to the following detailed description taken in connection with the accompanying drawings in which:
FIG 1 is a top view of the multi-layer disposable medical thermal blanket. FIG 2 is a cross-sectional end view of the multi-layer disposable medical thermal blanket taken along line 2-2 or FIG 1.
Similar reference characters refer to similar parts throughout the several views of the drawings.
Detailed-Description
As shown in FIGS 1 and 2, the present invention relates to a multi-layer disposable medical thermal blanket generally indicated as 10 for controlling body temperature by either heating or cooling a select area of application on the patient's body. As described more fully hereinafter, the thermal blanket 10 comprises an inner bladder having a highly moisture absorbent fiber layer and a moisture-proof layer disposed on opposite sides thereof generally indicated as 12, 14, and 16 respectively. The inner bladder 12 comprises a pair of bladder elements 18 and 20 sealed together to form a plurality of fluid conduits therebetween. The fluid conduits comprise an outer primary and inner secondary fluid path and a matrix of thermal application channels. More specifically, the outer primary fluid path comprises an outer primary fluid supply path 22 and an outer primary fluid return path 24 in fluid exchanging relationship relative to each other disposed about the outer periphery of the thermal blanket 10. The inner secondary fluid path comprises an inner secondary fluid supply path 26 and an inner secondary fluid return path 28 in fluid exchanging relationship realtive to each other disposed inwardly relative to the outer primary fluid path. The outer primary fluid supply path 22 and outer primary fluid return path 24 extend substantially the length of the thermal blanket 10 while the inner secondary fluid supply path 26 and inner secondary fluid return path 28 extend substantially one half the length of the thermal blanket. The cross sectional area of the primary fluid path is substantially greater than the secondary fluid path and thermal application channels to permit the primary fluid path to expand outwardly from the sufrace of the thermal blanket 10 under the fluid pressure as the fluid is circulated through the thermal blanket 10 to effectively form a seal with the patient's body at the selected area of application to retain the thermal energy to the applied area when in the cooling mode with the moisture-proof layer adjacent the patient's body. As a result of the moisture inhibiting nature of the moisture proof layer 16, no condensation is formed on the surface of the moisture proof layer 16 thereby reducing the presence of undesired moisture or fluid. Layer 16 comprises a flexible sheet of closed cell foam formed by a plurality of discontinuous voids. Extending substantially perpendicular to the outer primary and inner secondary fluid paths is a matrix of thermal application channels each indicated as 30. In forming the outer primary and inner secondary fluid paths and thermal application channels 30 a plurality of ribs separating the various fluid paths and channels are formed. More specifically, the thermal applicatin channels 30 have interrupted ribs 32 on opposite sides thereof forming cross channels 33 thus permitting communication between adjacent thermal application channels 30 to more evenly distribute the pressure over the entire thermal blanket 10. The inner secondary fluid path includes an interrupted rib and stops 34 and 36 respectively. Adjacent segments 38 of the interrupted ribs 34 cooperatively form secondary fluid path channels each indicated as 40. The outer primary fluid path includes an interrupted rib 42 having supplemental fluid channel 44 in communication with -the secondary fluid path and a plurality of primary fluid path channels each indicated as 46 on the outer portions thereof formed by adjacent segments 48.
The highly absorbent fabric layer 14 is used for the heating application and may be moistened to further enhance the thermal conductivity through the inner bladder 12 to the patient's body.
In operation, the thermal blanket 10 is coupled to a fluid heating and cooling circulating source by inlet supply conduit and outlet supply conduit 50 and 52 respectively. As the fluid is circulated into the thermal blanket 10 through inlet supply conduit 50, it simultaneously enters the outer primary fluid supply path 22 and inner secondary fluid supply path 26 and is forced longitudinally through the thermal blanket 10. The fluid enters the inner portion of the matrix of thermal channels 30 through the secondary fluid path channels 40. The inner portion of the matrix of thermal application channels 30 are supplemented by fluid passing through the supplemental fluid path channel 44 formed in the interrupted rib 42. Fluid is supplied to the outer portion of the thermal blanket 10 through the plurality of primary fluid path channels 46 forming the outer portion of the interrupted rib 42. Since the outer portion of the interrupted ribs 32 are disposed inwardly of the interrupted ribs 34 and 42 in combination with the cross channels 33, fluid is permitted to freely balance the pressure within the entire matrix of thermal application channels 30. As fluid passes through the matrix of thermal application channels 30, it is permitted to exit through channels 40, 44, and 46 into the inner secondary return path and outer primary fluid return path 28 and 24 respectively. Stops 36 are formed on the mid portion of the interrupted ribs 42 to limit flow between the inner secondary fluid path 28 and the outer portion of the thermal blanket 10. The unique matrix of conduits prevents pinching off of the entire thermal blanket 10 even through the thermal blanket 10 may be folded.
It will thus be seen that the objects set forth above, and those made apparent from the preceding description are efficiently attained and since certain changes may be made in the above construction without departing from the scope of the invention, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.
It is also to be understood that the following claims are intended to conver all of the generic and specific features of the invention herein described, and all statements of the scope of the invention which as a matter of language, might be said to fall therebetween. Now that the invention has been described.

Claims

PT.A T Q
1. A multi-layer disposable medical thermal blanket for controlling body temperature by either heating or cooling selected areas of application comprising an inner bladder forming a matrix conduit for circulating fluid therethrough, said matrix conduit comprising an outer primary fluid path disposed about the outer periphery of the thermal blanket and an inner secondary fluid path, and a plurality of substantially parallel thermal-application channels inclined relative to substantially outer primary and inner secondary fluid paths to provide fluid communications therebetween for application to the patient's body.
2. The multi-layer disposable medical thermal blanket of Claim 1 wherein said outer primary fluid path comprises a primary fluid supply path and primary fluid return path in fluid exchanging relationship relative to each other disposed about the outer periphery of said thermal blanket.
3. The multi-layer disposable medical thermal blanket of Claim 2 wherein said secondary fluid path comprises an inner secondary fluid supply path and an inner secondary fluid return path in fluid exchanging relationship relative to each other disposed inwardly relative to said outer primary fluid path about the periphery of said thermal blanket.
4. The multi-layer disposable medical thermal blanket of Claim 3 wherein said outer primary fluid supply path and said outer fluid return path extends substantially the length of said thermal blanket on said inner secondary fluid supply path and said secondary inner fluid return path extend to the mid-portion of said thermal blanket.
5. The multi-layer disposable medical thermal blanket of Claim 3 wherein the cross-sectional area of said primary fluid path is substantially greater than the cross-sectional area of the secondary fluid path and said thermal application channels permit said primary fluid path th expand outwardly from the surface of said thermal blanket under the fluid pressure as fluid is circulated through said thermal blanket to effectively form a seal with the patient's body at the selected area of application to retain the thermal energy to the applied area.
6. The multi-layer disposable medical thermal blanket of Claim 4 wherein said outer primary fluid path includes an interrupted rib having a supplemental fluid path channel formed therein in fluid communication with said secondary fluid path and a plurality of primary fluid path channels formed on the outer portion thereof for fluid communication with the outer portion of said thermal application channels.
7. The multi-layer disposable medical thermal blanket of Claim 6 wherein said inner secondary fluid path includes an interrupted rib wherein adjacent segments of said interrupted rib cooperatively form secondary fluid path channels in fluid communication with the inner portion of said thermal application channels.
8. The multi-layer disposable medical thermal blanket of Claim 7 wherein said thermal application channels comprise a spaced apart plurality of thermal application ribs cooperatively forming said thermal application channels.
9. The multi-layer disposable medical thermal blanket of Claim 8 whereby said thermal application ribs comprise interrupted ribs forming a plurality of cross channels to permit fluid flow between adjacent thermal application channels.
10. The multi-layer disposable medical thermal blanket of Claim 9 wherein the outer portion of said thermal application ribs are disposed inwardly from said interrupted rib of said inner secondary fluid path and said interrupted rib of said outer primary fluid path to permit fluid flow between the outer portion of adjacent thermal application channels.
11. The multi-layer disposable medical thermal blanket of Claim 6 wherein stop members extend inwardly from the mid-portion of said interrupted rib of said outer primary fluid path into the out end of said inner secondary fluid path to limit the flow of fluid between said inner secondary fluid path and said outer portion of said thermal blanket.
12. The multi-layer disposable medical thermal blanket for controlling body temperature by either heating or cooling selected areas of application comprising an inner bladder for circulating fluid therethrough having a flexible sheet of foam formed by a plurality of discontinuous voids attached to one surface thereof to reduce the formation of moisture on the surface of said inner bladder adjacent said flexible sheet.
13. The multi-layer disposable medical thermal blanket of Claim 12 further including a highly absorbent fabric layer attached to one surface thereof to improve thermal conduction between said inner bladder and the selected area of application.
EP19850900886 1984-01-18 1985-01-18 Multi-layer disposable medical thermal blanket. Withdrawn EP0168483A4 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US57172084A 1984-01-18 1984-01-18
US571720 1984-01-18

Publications (2)

Publication Number Publication Date
EP0168483A1 true EP0168483A1 (en) 1986-01-22
EP0168483A4 EP0168483A4 (en) 1987-01-20

Family

ID=24284770

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850900886 Withdrawn EP0168483A4 (en) 1984-01-18 1985-01-18 Multi-layer disposable medical thermal blanket.

Country Status (4)

Country Link
EP (1) EP0168483A4 (en)
JP (1) JPS60502042A (en)
AU (1) AU3881685A (en)
WO (1) WO1985003216A1 (en)

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Also Published As

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JPS60502042A (en) 1985-11-28
AU3881685A (en) 1985-08-09
WO1985003216A1 (en) 1985-08-01
EP0168483A4 (en) 1987-01-20

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