CA2595806A1 - Synthetic medical bandage product with waterless hardening feature and method of applying cast tape to form cast - Google Patents
Synthetic medical bandage product with waterless hardening feature and method of applying cast tape to form cast Download PDFInfo
- Publication number
- CA2595806A1 CA2595806A1 CA002595806A CA2595806A CA2595806A1 CA 2595806 A1 CA2595806 A1 CA 2595806A1 CA 002595806 A CA002595806 A CA 002595806A CA 2595806 A CA2595806 A CA 2595806A CA 2595806 A1 CA2595806 A1 CA 2595806A1
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- Prior art keywords
- medical bandage
- activator
- resin
- resin system
- application
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- Abandoned
Links
- 238000000034 method Methods 0.000 title claims abstract description 13
- 229920005989 resin Polymers 0.000 claims abstract description 93
- 239000011347 resin Substances 0.000 claims abstract description 93
- 239000012190 activator Substances 0.000 claims abstract description 72
- 239000003094 microcapsule Substances 0.000 claims abstract description 21
- 208000027418 Wounds and injury Diseases 0.000 claims abstract description 12
- 230000006378 damage Effects 0.000 claims abstract description 11
- 208000014674 injury Diseases 0.000 claims abstract description 11
- 239000011248 coating agent Substances 0.000 claims abstract description 4
- 238000000576 coating method Methods 0.000 claims abstract description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 16
- 239000001257 hydrogen Substances 0.000 claims description 16
- 229910052739 hydrogen Inorganic materials 0.000 claims description 16
- 239000004593 Epoxy Substances 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 150000001875 compounds Chemical class 0.000 claims description 14
- 239000007788 liquid Substances 0.000 claims description 14
- 229920002635 polyurethane Polymers 0.000 claims description 14
- 239000004814 polyurethane Substances 0.000 claims description 14
- 229920000642 polymer Polymers 0.000 claims description 9
- 239000012948 isocyanate Substances 0.000 claims description 6
- 150000002513 isocyanates Chemical class 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 5
- 150000008065 acid anhydrides Chemical class 0.000 claims description 5
- 150000004982 aromatic amines Chemical class 0.000 claims description 5
- 239000004202 carbamide Substances 0.000 claims description 5
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 claims description 5
- 125000005442 diisocyanate group Chemical group 0.000 claims description 5
- 150000002009 diols Chemical class 0.000 claims description 5
- 125000003700 epoxy group Chemical group 0.000 claims description 5
- 239000000178 monomer Substances 0.000 claims description 5
- 229920001610 polycaprolactone Polymers 0.000 claims description 5
- 239000004632 polycaprolactone Substances 0.000 claims description 5
- 229920000515 polycarbonate Polymers 0.000 claims description 5
- 239000004417 polycarbonate Substances 0.000 claims description 5
- 229920005862 polyol Polymers 0.000 claims description 5
- 150000003077 polyols Chemical class 0.000 claims description 5
- 150000003139 primary aliphatic amines Chemical class 0.000 claims description 5
- 150000003142 primary aromatic amines Chemical class 0.000 claims description 5
- 150000005619 secondary aliphatic amines Chemical class 0.000 claims description 5
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 claims description 4
- 150000001732 carboxylic acid derivatives Chemical class 0.000 claims description 4
- 230000000977 initiatory effect Effects 0.000 claims description 4
- 238000004806 packaging method and process Methods 0.000 claims description 2
- 239000005058 Isophorone diisocyanate Substances 0.000 claims 2
- NIMLQBUJDJZYEJ-UHFFFAOYSA-N isophorone diisocyanate Chemical compound CC1(C)CC(N=C=O)CC(C)(CN=C=O)C1 NIMLQBUJDJZYEJ-UHFFFAOYSA-N 0.000 claims 2
- 210000003414 extremity Anatomy 0.000 description 13
- 239000000758 substrate Substances 0.000 description 7
- 238000005266 casting Methods 0.000 description 6
- 230000004913 activation Effects 0.000 description 5
- 239000004753 textile Substances 0.000 description 5
- 238000001266 bandaging Methods 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 2
- 210000000245 forearm Anatomy 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- 239000011505 plaster Substances 0.000 description 2
- 229920005749 polyurethane resin Polymers 0.000 description 2
- 230000002028 premature Effects 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 150000001735 carboxylic acids Chemical class 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 150000004985 diamines Chemical group 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 230000035876 healing Effects 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000004005 microsphere Substances 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000000344 soap Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 150000003673 urethanes Chemical class 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
- A61L15/07—Stiffening bandages
- A61L15/14—Use of materials characterised by their function or physical properties
-
- 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
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/04—Plaster of Paris bandages; Other stiffening bandages
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
- A61L15/07—Stiffening bandages
- A61L15/12—Stiffening bandages containing macromolecular materials
Landscapes
- Health & Medical Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- Public Health (AREA)
- Engineering & Computer Science (AREA)
- Veterinary Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Epidemiology (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Materials For Medical Uses (AREA)
- Medicinal Preparation (AREA)
Abstract
A latent resin system coated onto or impregnated into a medical bandage, the resin remaining soft and comformable during exposure to ambient moisture. An activator is provided for reacting with the resin for hardening the resin and the medical bandage. The method includes the steps of providing a medical bandage and coating or impregnating the medical bandage with a resin system that remains soft and comformable during exposure to ambient moisture. A resin activator is provided and is maintained separate from the medical bandage until after application of the medical bandage to the injury site. The resin activator is applied to the medical bandage after application of the medical bandage to the injury site to thereby harden the medical bandage into a rigid cast, or microcapsules within which the activator and/or resin are contained are ruptured to harden the medical bandage into a rigid cast.
Description
SYNTHETIC MEDICAL BANDAGE
PRODUCT WITH WATERLESS HARDENING FEATURE
AND METHOD OF APPLYING CAST TAPE TO FORM CAST
Technicai Field and Background of the Invention [0001] This invention relates to a medical bandage casting system comprising a latent resin/polymer impregnated substrate that can be activated/cured using a suitable activator. The casting system includes a cast tape intended to be placed around an injured limb, over a padding, and hardened in place to form a rigid, orthopedically-effective structure. The invention also relates to a method of applying a cast tape to form a cast.
[00021 Conventional casting systems that presently predominate in the market are either a plaster-coated fabric that is wetted and placed on a limb to harden in place, or a moisture cured polyurethane resin system impregnated into or coated onto a fabric tape. The cast tape is applied in a flexible, limp condition to the limb by a technician after wetting but before the tape hardens. The resin system relies on a substantial amount of water to initiate the reaction that hardens the tape into a cast.
[ooos) The resin impregnated cast tape is packaged in a moisture impervious package, usually a lamination of plastic film and metal foil. However, once the package is open and the cast tape is brought into contact with the ambient environment, the polyurethane resin activates and hardens over a period of time due to the presence of moisture in the atmosphere. The speed of activation and hardening of the cast tape depends on the amount of moisture available for the tape. If the cast tape is saturated with water, the activation will be faster.
[00041 The temperature of the ambient air as well as the temperature of the water also affects the speed of activation. All these factors introduce a wide variability in the perforrnance of current casting tape products and systems. There thus exists a need for a product that remains soft and flexible even during exposure to the ambient environment and thus provides the cast technician sufficient time to mold the cast tape onto the fractured limb and set the bone in position without premature hardening of the cast tape.
[0005] Another drawback of the conventional polyurethane based casting systems is that water is required for activation. In current clinical practice, the cast tape is dipped into water, squeezed to remove excess water, and then quickly applied to the patient. However, in many emergency situations, such at accident sites, water for activating the cast tape is not readily available. This creates a need for a casting system that can be activated without the need of water.
[0006] The invention described here provides a resin chemistry that offers a solution to the problems associated with water activation.
Summary of the Invention [0007] Therefore, it is an object of the invention to provide a resin system for a cast tape that can use any suitable chemistry, including but not limited to a two component epoxy and polyurethane system.
[0008] It is another object of the invention to provide a medical bandage product that need not be stored in expensive moisture barrier containers.
[0009] It is another object of the invention to provide a medical bandage product that does not require water to harden the bandage into a rigid cast product.
[0010] It is another Object of the invention to provide a method of applying a cast tape to form a cast that hardens in situ on a limb.
[0011] These and objects and advantages of the invention are achieved by providing a latent resin system for a medical bandage, comprising resin for being coated onto or impregnated into a medical bandage, the resin remaining soft and comformable during exposure to ambient moisture. An activator is provided for reacting with the resin for initiating hardening of the resin and thereby the medical bandage.
PRODUCT WITH WATERLESS HARDENING FEATURE
AND METHOD OF APPLYING CAST TAPE TO FORM CAST
Technicai Field and Background of the Invention [0001] This invention relates to a medical bandage casting system comprising a latent resin/polymer impregnated substrate that can be activated/cured using a suitable activator. The casting system includes a cast tape intended to be placed around an injured limb, over a padding, and hardened in place to form a rigid, orthopedically-effective structure. The invention also relates to a method of applying a cast tape to form a cast.
[00021 Conventional casting systems that presently predominate in the market are either a plaster-coated fabric that is wetted and placed on a limb to harden in place, or a moisture cured polyurethane resin system impregnated into or coated onto a fabric tape. The cast tape is applied in a flexible, limp condition to the limb by a technician after wetting but before the tape hardens. The resin system relies on a substantial amount of water to initiate the reaction that hardens the tape into a cast.
[ooos) The resin impregnated cast tape is packaged in a moisture impervious package, usually a lamination of plastic film and metal foil. However, once the package is open and the cast tape is brought into contact with the ambient environment, the polyurethane resin activates and hardens over a period of time due to the presence of moisture in the atmosphere. The speed of activation and hardening of the cast tape depends on the amount of moisture available for the tape. If the cast tape is saturated with water, the activation will be faster.
[00041 The temperature of the ambient air as well as the temperature of the water also affects the speed of activation. All these factors introduce a wide variability in the perforrnance of current casting tape products and systems. There thus exists a need for a product that remains soft and flexible even during exposure to the ambient environment and thus provides the cast technician sufficient time to mold the cast tape onto the fractured limb and set the bone in position without premature hardening of the cast tape.
[0005] Another drawback of the conventional polyurethane based casting systems is that water is required for activation. In current clinical practice, the cast tape is dipped into water, squeezed to remove excess water, and then quickly applied to the patient. However, in many emergency situations, such at accident sites, water for activating the cast tape is not readily available. This creates a need for a casting system that can be activated without the need of water.
[0006] The invention described here provides a resin chemistry that offers a solution to the problems associated with water activation.
Summary of the Invention [0007] Therefore, it is an object of the invention to provide a resin system for a cast tape that can use any suitable chemistry, including but not limited to a two component epoxy and polyurethane system.
[0008] It is another object of the invention to provide a medical bandage product that need not be stored in expensive moisture barrier containers.
[0009] It is another object of the invention to provide a medical bandage product that does not require water to harden the bandage into a rigid cast product.
[0010] It is another Object of the invention to provide a method of applying a cast tape to form a cast that hardens in situ on a limb.
[0011] These and objects and advantages of the invention are achieved by providing a latent resin system for a medical bandage, comprising resin for being coated onto or impregnated into a medical bandage, the resin remaining soft and comformable during exposure to ambient moisture. An activator is provided for reacting with the resin for initiating hardening of the resin and thereby the medical bandage.
[00121 According to another embodiment of the invention, the resin system comprises a polyurethane system and the activator comprises a compound containing active hydrogen sites for curing the polyurethane.
[00131 According to yet another embodiment of the invention, the resin system comprises an isocyanate-containing monomer/polymer/prepolymer, and the activator is selected from the group consisting of water, polyol, primary aliphatic amine, secondary aliphatic amine, carboxylic acid, primary aromatic amine, urethane and urea.
[00141 According to yet another embodiment of the invention, the prepolymer comprises a blend of cycloaliphatic diisocyanate (IPDI), polycaprolactone and polycarbonate diol.
[00151 According to yet another embodiment of the invention, the resin system comprises an epoxy system and an activator containing active hydrogen sites for curing the epoxy.
[0016) According to yet another embodiment of the invention, the epoxy system includes epoxide groups for reacting the the active hydrogen sites of the activator.
[0017) According to yet another embodiment of the invention, the activator comprises a compound selected from the group consisting of aliphatic amine, aromatic amine and acid anhydride.
[00181 According to- yet another embodiment of the invention, the activator comprises a viscous liquid for being applied to the medical bandage after application to an injured limb to thereby activate and harden the resin system.
[0019) According to yet another embodiment of the invention, a medical bandage product is provided, and comprises a medical bandage and a latent resin system coated onto or impregnated into the medical bandage. A resin activator is provided and is maintained apart from the medical bandage until after the medical bandage has been applied to an injury site. The resin activator comprises a compound for reacting with the resin for initiating hardening of the resin and thereby the medical bandage.
[00131 According to yet another embodiment of the invention, the resin system comprises an isocyanate-containing monomer/polymer/prepolymer, and the activator is selected from the group consisting of water, polyol, primary aliphatic amine, secondary aliphatic amine, carboxylic acid, primary aromatic amine, urethane and urea.
[00141 According to yet another embodiment of the invention, the prepolymer comprises a blend of cycloaliphatic diisocyanate (IPDI), polycaprolactone and polycarbonate diol.
[00151 According to yet another embodiment of the invention, the resin system comprises an epoxy system and an activator containing active hydrogen sites for curing the epoxy.
[0016) According to yet another embodiment of the invention, the epoxy system includes epoxide groups for reacting the the active hydrogen sites of the activator.
[0017) According to yet another embodiment of the invention, the activator comprises a compound selected from the group consisting of aliphatic amine, aromatic amine and acid anhydride.
[00181 According to- yet another embodiment of the invention, the activator comprises a viscous liquid for being applied to the medical bandage after application to an injured limb to thereby activate and harden the resin system.
[0019) According to yet another embodiment of the invention, a medical bandage product is provided, and comprises a medical bandage and a latent resin system coated onto or impregnated into the medical bandage. A resin activator is provided and is maintained apart from the medical bandage until after the medical bandage has been applied to an injury site. The resin activator comprises a compound for reacting with the resin for initiating hardening of the resin and thereby the medical bandage.
[0020] According to yet another embodiment of the invention, the medical bandage product includes a package within which the medical bandage is packaged until ready for use in a package that is not impervious to ambient moisture.
[00211 According to yet another embodiment of the invention, the resin system comprises a polyurethane system and the activator comprises a compound containing active hydrogen sites for curing the polyurethane.
[0022] According to yet another embodiment of the invention, the resin system comprises an isocyanate-containing monomer/polymer/prepolymer, and the activator is selected from the group consisting of water, polyol, primary aliphatic amine, secondary aliphatic amine, carboxylic acid, primary aromatic amine, urethane and urea.
[0023) According to yet another embodiment of the invention, the prepolymer comprises a blend of cycloaliphatic diisocyanate (IPDI), polycaprolactone and polycarbonate diol.
[00241 According to yet another embodiment of the invention, the resin system comprises an epoxy system and an activator containing active hydrogen sites for curing the epoxy.
[00251 According to yet another embodiment of the invention, the epoxy system includes epoxide groups for reacting the the active hydrogen sites of the activator.
[00261 According to yet another embodiment of the invention, the activator comprises a compound selected from the group consisting of aliphatic amine, aromatic amine and acid anhydride.
[00271 According to yet another embodiment of the invention, the activator comprises a viscous liquid for being applied to the medical bandage after application to an injured limb to thereby activate and harden the resin system.
[0028) According to yet another embodiment of the invention, the medical bandage comprises a cast tape.
[00291 A method according to the invention comprises the steps of providing a medical bandage, coating or impregnating the medical bandage with a resin system that remains soft and comformable during exposure to ambient moisture. The medical bandage is applied to an injury site. A resin activator is provided and is maintained separate from the medical bandage until after application of the medical bandage to the injury site. The resin activator is applied to the medical bandage after application of the medical bandage to the injury site to thereby harden the medical bandage into a rigid cast.
[00301 According to yet another embodiment of the invention, the method includes the step of packaging the medical bandage in a package until use that is not impervious to ambient moisture.
Brief Description of the Drawings [0031] Some of the objects of the invention have been set forth above. Other objects and advantages of the invention will appear as the invention proceeds when taken in conjunction with the following drawings, in which:
[00321 Figure 1 is a medical bandaging product that includes a cast tape according to an embodiment of the invention;
[0033] Figure 2 shows the cast tape when removed from its protective pouch;
[0034] Figure 3 illustrates application of the cast tape to the lower leg to form a cast when hardened;
[0035] Figure 4 illustrated dispensing of the activator preliminary to application to the cast tape to initiate hardening;
[00361 Figure 5 shows application of the activator to the cast;
[0037] Figure 6 shows the completed cast; and t003e1 Figure 7 shows a completed forearm cast formed using the cast tape according to an embodiment of the invention.
Description of the Preferred Embodiment and Best Mode [0039] Referring now specifically to the drawings, a medical bandaging product according to the present invention is illustrated in Figure 1 and shown generally at reference numeral 10. The medical bandaging product comprises an outer pouch in which is contained a roll of cast tape 12. Unlike moisture-curable cast tapes, cast tape 12 need not be sealed in a moisture impervious package, but merely in a package of a type sufficient to keep the cast tape clean, relatively dry and in its proper shape.
[0040] As is shown in Figure 2, the cast tape 12 comprises an elongate textile substrate that can be any suitable knitted, woven or a non-woven fabric constructed using any organic or inorganic yarns or a blend of the same. In the most preferred form, the textile substrate is a warp knitted fabric constructed using polyester and polypropylene yarns. The tape 12 may be wound onto a tube 13 for shipment and storage until use.
[0041] Use of the cast tape 12 according to a preferred method according to the invention is carried out by removing the cast tape 12 in roll form from the pouch 11 and applying the cast tape 12 to an injured limb in a conventional manner after placement of a suitable underpadding 14 on the limb. , As described below, the cast tape remains in a soft, flexible state until the cast technician is satisfied that the cast has been properly applied and adjusted, and is ready to be transformed into its hardened state.
[0042] In accordance with the invention, the chemical system comprises a resin and an activator, and is preferably either a polyurethane system or an epoxy system.
The polyurethane system is based on the reaction of an isocyanate containing monomer/polymer/prepolymer with a suitable compound containing active hydrogen.
Compounds containing active hydrogen sites that can be used for curing the isocyanate include water, polyol (primary, secondary and tertiary hydroxyl groups), primary and secondary aliphatic amines, amides, carboxylic acids, primary aromatic amines, urethanes and urea. Epoxy-based resin systems are similar to polyurethanes in that the epoxide group reacts with an active hydrogen containing compound. The preferred active hydrogen containing compound is an aliphatic or aromatic amine and/or acid anhydride.
[0043] In this disclosure of the invention, a preferred resin chemistry comprises a polyurethane-based resin system. The prepolymer is a blend of a cycloaliphatic diisocyanate (IPDI), polycaprolactone and polycarbonate diols.
[0044] The prepolymer is applied onto the textile substrate forming the cast tape 12 by either coating or impregnating the substrate with a liquid containing the prepolymer. The prepolymer loading level varies depending on the weight, density, thickness and materials from which the textile substrate is fabricated. The prepolymer-impregnated textile will remain latent and thus in its flexible form after opening the package and can be easily applied on the patient's limb without the resin hardening.
[00451 Once the limb is set in the correct position and the cast technician is ready to activate the cast tape 12, the activator is applied onto the surface of the cast tape 12 to harden the cast in position. The activator is preferably a secondary diamine such as Clearlink 1000 by Dorf Ketal Chemicals LLC, Texas, USA. As shown in Figure 4, the activator may preferably be in the form of a viscous, creamy liquid 21 and may suitably be stored in a dispenser 20, such as a soap dispenser, conveniently located for ready access by the cast technician. Other containers may be used, such as small single-use pouches or envelopes, tubes or squeeze bottles. The activator liquid is formulated to be essentially dripless and with sufficient lubricity and spread rate to readily and evenly coat the cast tape 12 with a light, rubbing pressure applied by the cast technician.
[0046] Typically, protective gloves are worn to prevent contact between the hands and the chemicals in the resin and the activator, as shown in Figures 4 and 5.
[0047] As also shown in Figure 5, the cast technician applies the activator evenly onto the outer surface of the cast tape 12, already properly in place on the limb.
Contact between the activator and the resin initiates the above-described reaction that quickly hardens the cast tape 12, forming a rigid cast, as shown in Figure 6.
The hardening is irreversible, i.e., the cast formed from the rigid cast tape 12 will not soften if wetted or heated. The cast may be removed in the usual manner when healing is complete by use of a standard cast removal saw.
[0048] The waterless cast system can also be produced using activator components encapsulated in microspheres or microcapsules. The microcapsules, known in fields such as printing ink containment, contain the activator, or both the activator and the catalyst. In this embodiment, the cast tape is coated with a latent polymer system that remains stable and does not activate on exposure to ambient conditions, as described above. The microcapsules are embedded either in the resin system or coated onto the surface of the substrate. In the preferred form, the microcapsuies are embedded in the latent resin system itself. The clinician applies the cast tape around the fractured limb as described above. To activate the cast system, the clinician rubs or gently presses around the cast during application, as is the case with application of ordinary casts.
[0049] Applying the pressure on the cast will break a sufficient number of the microcapsuies to release the components from the microcapsules. Upon releasing the activator or activator/catalyst, they react with and activate the the polymer system. The rubbing and pressing promotes even distribution across the surface area of the cast, however, the microcapsuies are themselves relatively evenly distributed so that only a minimal amount of rubbing or pressing, for example only that amount normally provided during cast application, is required.
[0050] The microencapsulation technique offers advantages, including improved lamination between layers and eliminates the requirement for a separate activator component delivery system. Since the microcapsules are present in the resin system itself, the activator is available between every layer and provides uniform setting time and rigidity level across several layers of the cast. The microcapsule construction is selected with desired material and wall thickness to control the pressure required to rupture the microcapsules, and prevent any premature rupture of microcapsules during the cast tape application.
[0051a The lower leg cast shown in the preceding drawings are merely illustrative of the many types of casts that can be formed using the cast tape 12. In general, any cast that can be formed using a prior art plaster or synthetic, moisture-curable cast tape can be formed using the cast tape 12 according to the invention described above. See, for example, the forearm cast as shown in Figure 7.
[0052] The term resin and polymer are used interchangeably in this application to describe the material applied to the cast tape 12 before being sealed into the pouch 11. The term "latent resin system" as used herein refers to a resin system that will not activate or cure upon exposure to air, moisture or ambient environment, but will only activate once the curing agent is brought in contact with the activator part of the resin system.
[0053] A synthetic waterless cast tape is described above. Various details of the invention may be changed without departing from its scope. Furthermore, the foregoing description of the preferred embodiment of the invention and the best mode for practicing the invention are provided for the purpose of illustration only and not for the purpose of limitation--the invention being defined by the claims.
[00211 According to yet another embodiment of the invention, the resin system comprises a polyurethane system and the activator comprises a compound containing active hydrogen sites for curing the polyurethane.
[0022] According to yet another embodiment of the invention, the resin system comprises an isocyanate-containing monomer/polymer/prepolymer, and the activator is selected from the group consisting of water, polyol, primary aliphatic amine, secondary aliphatic amine, carboxylic acid, primary aromatic amine, urethane and urea.
[0023) According to yet another embodiment of the invention, the prepolymer comprises a blend of cycloaliphatic diisocyanate (IPDI), polycaprolactone and polycarbonate diol.
[00241 According to yet another embodiment of the invention, the resin system comprises an epoxy system and an activator containing active hydrogen sites for curing the epoxy.
[00251 According to yet another embodiment of the invention, the epoxy system includes epoxide groups for reacting the the active hydrogen sites of the activator.
[00261 According to yet another embodiment of the invention, the activator comprises a compound selected from the group consisting of aliphatic amine, aromatic amine and acid anhydride.
[00271 According to yet another embodiment of the invention, the activator comprises a viscous liquid for being applied to the medical bandage after application to an injured limb to thereby activate and harden the resin system.
[0028) According to yet another embodiment of the invention, the medical bandage comprises a cast tape.
[00291 A method according to the invention comprises the steps of providing a medical bandage, coating or impregnating the medical bandage with a resin system that remains soft and comformable during exposure to ambient moisture. The medical bandage is applied to an injury site. A resin activator is provided and is maintained separate from the medical bandage until after application of the medical bandage to the injury site. The resin activator is applied to the medical bandage after application of the medical bandage to the injury site to thereby harden the medical bandage into a rigid cast.
[00301 According to yet another embodiment of the invention, the method includes the step of packaging the medical bandage in a package until use that is not impervious to ambient moisture.
Brief Description of the Drawings [0031] Some of the objects of the invention have been set forth above. Other objects and advantages of the invention will appear as the invention proceeds when taken in conjunction with the following drawings, in which:
[00321 Figure 1 is a medical bandaging product that includes a cast tape according to an embodiment of the invention;
[0033] Figure 2 shows the cast tape when removed from its protective pouch;
[0034] Figure 3 illustrates application of the cast tape to the lower leg to form a cast when hardened;
[0035] Figure 4 illustrated dispensing of the activator preliminary to application to the cast tape to initiate hardening;
[00361 Figure 5 shows application of the activator to the cast;
[0037] Figure 6 shows the completed cast; and t003e1 Figure 7 shows a completed forearm cast formed using the cast tape according to an embodiment of the invention.
Description of the Preferred Embodiment and Best Mode [0039] Referring now specifically to the drawings, a medical bandaging product according to the present invention is illustrated in Figure 1 and shown generally at reference numeral 10. The medical bandaging product comprises an outer pouch in which is contained a roll of cast tape 12. Unlike moisture-curable cast tapes, cast tape 12 need not be sealed in a moisture impervious package, but merely in a package of a type sufficient to keep the cast tape clean, relatively dry and in its proper shape.
[0040] As is shown in Figure 2, the cast tape 12 comprises an elongate textile substrate that can be any suitable knitted, woven or a non-woven fabric constructed using any organic or inorganic yarns or a blend of the same. In the most preferred form, the textile substrate is a warp knitted fabric constructed using polyester and polypropylene yarns. The tape 12 may be wound onto a tube 13 for shipment and storage until use.
[0041] Use of the cast tape 12 according to a preferred method according to the invention is carried out by removing the cast tape 12 in roll form from the pouch 11 and applying the cast tape 12 to an injured limb in a conventional manner after placement of a suitable underpadding 14 on the limb. , As described below, the cast tape remains in a soft, flexible state until the cast technician is satisfied that the cast has been properly applied and adjusted, and is ready to be transformed into its hardened state.
[0042] In accordance with the invention, the chemical system comprises a resin and an activator, and is preferably either a polyurethane system or an epoxy system.
The polyurethane system is based on the reaction of an isocyanate containing monomer/polymer/prepolymer with a suitable compound containing active hydrogen.
Compounds containing active hydrogen sites that can be used for curing the isocyanate include water, polyol (primary, secondary and tertiary hydroxyl groups), primary and secondary aliphatic amines, amides, carboxylic acids, primary aromatic amines, urethanes and urea. Epoxy-based resin systems are similar to polyurethanes in that the epoxide group reacts with an active hydrogen containing compound. The preferred active hydrogen containing compound is an aliphatic or aromatic amine and/or acid anhydride.
[0043] In this disclosure of the invention, a preferred resin chemistry comprises a polyurethane-based resin system. The prepolymer is a blend of a cycloaliphatic diisocyanate (IPDI), polycaprolactone and polycarbonate diols.
[0044] The prepolymer is applied onto the textile substrate forming the cast tape 12 by either coating or impregnating the substrate with a liquid containing the prepolymer. The prepolymer loading level varies depending on the weight, density, thickness and materials from which the textile substrate is fabricated. The prepolymer-impregnated textile will remain latent and thus in its flexible form after opening the package and can be easily applied on the patient's limb without the resin hardening.
[00451 Once the limb is set in the correct position and the cast technician is ready to activate the cast tape 12, the activator is applied onto the surface of the cast tape 12 to harden the cast in position. The activator is preferably a secondary diamine such as Clearlink 1000 by Dorf Ketal Chemicals LLC, Texas, USA. As shown in Figure 4, the activator may preferably be in the form of a viscous, creamy liquid 21 and may suitably be stored in a dispenser 20, such as a soap dispenser, conveniently located for ready access by the cast technician. Other containers may be used, such as small single-use pouches or envelopes, tubes or squeeze bottles. The activator liquid is formulated to be essentially dripless and with sufficient lubricity and spread rate to readily and evenly coat the cast tape 12 with a light, rubbing pressure applied by the cast technician.
[0046] Typically, protective gloves are worn to prevent contact between the hands and the chemicals in the resin and the activator, as shown in Figures 4 and 5.
[0047] As also shown in Figure 5, the cast technician applies the activator evenly onto the outer surface of the cast tape 12, already properly in place on the limb.
Contact between the activator and the resin initiates the above-described reaction that quickly hardens the cast tape 12, forming a rigid cast, as shown in Figure 6.
The hardening is irreversible, i.e., the cast formed from the rigid cast tape 12 will not soften if wetted or heated. The cast may be removed in the usual manner when healing is complete by use of a standard cast removal saw.
[0048] The waterless cast system can also be produced using activator components encapsulated in microspheres or microcapsules. The microcapsules, known in fields such as printing ink containment, contain the activator, or both the activator and the catalyst. In this embodiment, the cast tape is coated with a latent polymer system that remains stable and does not activate on exposure to ambient conditions, as described above. The microcapsules are embedded either in the resin system or coated onto the surface of the substrate. In the preferred form, the microcapsuies are embedded in the latent resin system itself. The clinician applies the cast tape around the fractured limb as described above. To activate the cast system, the clinician rubs or gently presses around the cast during application, as is the case with application of ordinary casts.
[0049] Applying the pressure on the cast will break a sufficient number of the microcapsuies to release the components from the microcapsules. Upon releasing the activator or activator/catalyst, they react with and activate the the polymer system. The rubbing and pressing promotes even distribution across the surface area of the cast, however, the microcapsuies are themselves relatively evenly distributed so that only a minimal amount of rubbing or pressing, for example only that amount normally provided during cast application, is required.
[0050] The microencapsulation technique offers advantages, including improved lamination between layers and eliminates the requirement for a separate activator component delivery system. Since the microcapsules are present in the resin system itself, the activator is available between every layer and provides uniform setting time and rigidity level across several layers of the cast. The microcapsule construction is selected with desired material and wall thickness to control the pressure required to rupture the microcapsules, and prevent any premature rupture of microcapsules during the cast tape application.
[0051a The lower leg cast shown in the preceding drawings are merely illustrative of the many types of casts that can be formed using the cast tape 12. In general, any cast that can be formed using a prior art plaster or synthetic, moisture-curable cast tape can be formed using the cast tape 12 according to the invention described above. See, for example, the forearm cast as shown in Figure 7.
[0052] The term resin and polymer are used interchangeably in this application to describe the material applied to the cast tape 12 before being sealed into the pouch 11. The term "latent resin system" as used herein refers to a resin system that will not activate or cure upon exposure to air, moisture or ambient environment, but will only activate once the curing agent is brought in contact with the activator part of the resin system.
[0053] A synthetic waterless cast tape is described above. Various details of the invention may be changed without departing from its scope. Furthermore, the foregoing description of the preferred embodiment of the invention and the best mode for practicing the invention are provided for the purpose of illustration only and not for the purpose of limitation--the invention being defined by the claims.
Claims (26)
1. A latent resin system for a medical bandage, comprising:
(a) a resin for being coated onto or impregnated into a medical bandage, the resin remaining soft and comformable during exposure to ambient moisture; and (b) an activator for reacting with the resin for initiating hardening of the resin and thereby the medical bandage.
(a) a resin for being coated onto or impregnated into a medical bandage, the resin remaining soft and comformable during exposure to ambient moisture; and (b) an activator for reacting with the resin for initiating hardening of the resin and thereby the medical bandage.
2. A latent resin system according to claim 1, wherein the resin system comprises a polyurethane system and the activator comprises a compound containing active hydrogen sites for curing the polyurethane.
3. A latent resin system according to claim 1, wherein the resin system comprises an isocyanate-containing monomer/polymer/prepolymer, and the activator is selected from the group consisting of water, polyol, primary aliphatic amine, secondary aliphatic amine, carboxylic acid, primary aromatic amine, urethane and urea.
4. A latent resin system according to claim 3, wherein the prepolymer comprises a blend of cycloaliphatic diisocyanate (IPDI), polycaprolactone and polycarbonate diol.
5. A latent resin system according to claim 1, wherein the resin system comprises an epoxy system and an activator containing active hydrogen sites for curing the epoxy.
6. A latent resin system according to claim 5, wherein the epoxy system includes epoxide groups for reacting with the active hydrogen sites of the activator.
7. A latent resin system according to claim 6, wherein the activator comprises a compound selected from the group consisting of aliphatic amine, aromatic amine and acid anhydride.
8. A latent resin system according to claim 1, wherein the activator comprises a viscous liquid for being applied to the medical bandage after application to an injured limb to thereby activate and harden the resin system.
9. A latent resin system according to claim 1, wherein the activator comprises a liquid contained in a multitude of microcapsules dispersed across the surface area of the medical bandage for being ruptured after application to an injured limb to release the activator into contact with the resin system to thereby activate and harden the resin system.
10. A latent resin system according to claim 1, wherein the activator comprises a liquid contained in a multitude of first microcapsules dispersed on the medical bandage for being ruptured after application to an injured limb to release the activator, and the resin system comprises a liquid contained in a multitude of second microcapsules dispersed on the medical bandage for being ruptured after application to an injured limb to release the resin into contact with the activator released from the ruptured first microcapsules to thereby activate and harden the resin system.
11. A medical bandage product, comprising:
(a) a medical bandage;
(b) a latent resin system coated onto or impregnated into the medical bandage; and (c) a resin activator maintained apart from the medical bandage until after the medical bandage has been applied to an injury site, the resin activator comprising a compound for reacting with the resin for initiating hardening of the resin and thereby the medical bandage.
(a) a medical bandage;
(b) a latent resin system coated onto or impregnated into the medical bandage; and (c) a resin activator maintained apart from the medical bandage until after the medical bandage has been applied to an injury site, the resin activator comprising a compound for reacting with the resin for initiating hardening of the resin and thereby the medical bandage.
12. A medical bandage product according to claim 11, and including a package within which the medical bandage is packaged until ready for use that is not impervious to ambient moisture.
13. A medical bandage product according to claim 11, wherein the resin system comprises a polyurethane system, and the activator comprises a compound containing active hydrogen sites for curing the polyurethane.
14. A medical bandage product according to claim 11, wherein the resin system comprises an isocyanate-containing monomer/polymer/prepolymer, and the activator is selected from the group consisting of water, polyol, primary aliphatic amine, secondary aliphatic amine, carboxylic acid, primary aromatic amine, urethane and urea.
15. A medical bandage product according to claim 11, wherein the prepolymer comprises a blend of cycloaliphatic diisocyanate (IPDI), polycaprolactone and polycarbonate diol.
16. A medical bandage product according to claim 11, wherein the resin system comprises an epoxy system and an activator containing active hydrogen sites for curing the epoxy.
17. A medical bandage product according to claim 16, wherein the epoxy system includes epoxide groups for reacting the the active hydrogen sites of the activator.
18. A medical bandage product according to claim 17, wherein the activator comprises a compound selected from the group consisting of aliphatic amine, aromatic amine and acid anhydride.
19. A medical bandage product according to claim 11, wherein the activator comprises a viscous liquid for being applied to the medical bandage after application to an injury site to thereby activate and harden the resin system.
20. A medical bandage product according to claim 11, wherein the medical bandage comprises a cast tape.
21. A medical bandage product according to claim 11, wherein the activator comprises a liquid contained in a multitude of microcapsules dispersed across the surface area of the medical bandage for being ruptured after application to an injured limb to release the activator into contact with the resin system to thereby activate and harden the resin system.
22. A medical bandage product according to claim 11, wherein the activator comprises a liquid contained in a multitude of first microcapsules dispersed on the medical bandage for being ruptured after application to an injured limb to release the activator, and the resin system comprises a liquid contained in a multitude of second microcapsules dispersed on the medical bandage for being ruptured after application to an injured limb to release the resin into contact with the activator released from the ruptured first microcapsules to thereby activate and harden the resin system.
23. A method of forming a medical bandage product, comprising the steps of:
(a) providing a medical bandage;
(b) coating or impregnating the medical bandage with a resin system that remains soft and comformable during exposure to ambient moisture;
(c) removing the medical bandage from the package and applying the medical bandage to an injury site;
(d) providing a resin activator that is maintained separate from the medical bandage until after application of the medical bandage to the injury site; and (e) applying the resin activator to the medical bandage after application of the medical bandage to the injury site to thereby harden the medical bandage into a rigid cast.
(a) providing a medical bandage;
(b) coating or impregnating the medical bandage with a resin system that remains soft and comformable during exposure to ambient moisture;
(c) removing the medical bandage from the package and applying the medical bandage to an injury site;
(d) providing a resin activator that is maintained separate from the medical bandage until after application of the medical bandage to the injury site; and (e) applying the resin activator to the medical bandage after application of the medical bandage to the injury site to thereby harden the medical bandage into a rigid cast.
24. A method according to claim 23, and including the step of packaging the medical bandage in a package until use that is not impervious to ambient moisture.
25. A method according to claim 23, and including the step of encapsulating the activator as a liquid in a multitude of microcapsules dispersed across the surface area of the medical bandage for being ruptured after application to an injured limb to release the activator into contact with the resin system to thereby activate and harden the resin system.
26. A method according to claim 23, and including the steps of:
(a) encapsulating the activator in a multitude of first microcapsules dispersed on the medical bandage for being ruptured after application to an injured limb to release the activator; and (b) encapsulating the resin system in a multitude of second microcapsules dispersed on the medical bandage for being ruptured after application to an injured limb to release the resin into contact with the activator released from the ruptured first microcapsules to thereby activate and harden the resin system.
(a) encapsulating the activator in a multitude of first microcapsules dispersed on the medical bandage for being ruptured after application to an injured limb to release the activator; and (b) encapsulating the resin system in a multitude of second microcapsules dispersed on the medical bandage for being ruptured after application to an injured limb to release the resin into contact with the activator released from the ruptured first microcapsules to thereby activate and harden the resin system.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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US64694505P | 2005-01-25 | 2005-01-25 | |
US60/646,945 | 2005-01-25 | ||
PCT/US2006/002234 WO2006081164A2 (en) | 2005-01-25 | 2006-01-23 | Synthetic medical bandage product with waterless hardening feature and method of applying cast tape to form cast |
Publications (1)
Publication Number | Publication Date |
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CA2595806A1 true CA2595806A1 (en) | 2006-08-03 |
Family
ID=36740972
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002595806A Abandoned CA2595806A1 (en) | 2005-01-25 | 2006-01-23 | Synthetic medical bandage product with waterless hardening feature and method of applying cast tape to form cast |
Country Status (6)
Country | Link |
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EP (1) | EP1855627A2 (en) |
JP (1) | JP2008528118A (en) |
AU (1) | AU2006209185B2 (en) |
CA (1) | CA2595806A1 (en) |
MX (1) | MX2007008937A (en) |
WO (1) | WO2006081164A2 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010005031A (en) * | 2008-06-25 | 2010-01-14 | Nagase Chemtex Corp | Bandage for fixation |
CN102772278A (en) * | 2012-07-10 | 2012-11-14 | 东华大学 | Shape-righting bandage capable of being naturally degraded and preparation method |
WO2014209524A1 (en) * | 2013-06-28 | 2014-12-31 | Bsn Medical, Inc. | Orthopedic cast and splint bandages with encapsulated hardening medium and method |
KR101414493B1 (en) * | 2013-09-24 | 2014-07-14 | 주식회사 우리소재 | Thermoplastic Cast and Its Manufacturing Method |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3996934A (en) * | 1971-08-09 | 1976-12-14 | Alza Corporation | Medical bandage |
US5118779A (en) * | 1989-10-10 | 1992-06-02 | Polymedica Industries, Inc. | Hydrophilic polyurethane elastomers |
GB9303200D0 (en) * | 1993-02-17 | 1993-03-31 | Smith & Nephew | Orthopaedic casting bandage |
US5807292A (en) * | 1996-06-24 | 1998-09-15 | Minnesota Mining And Manufacturing Company | Orthopedic casting article having soft and hard regions |
US5944674A (en) * | 1997-11-03 | 1999-08-31 | Johnson & Johnson Professional, Inc. | Controlled tack polyurethane casting tape |
-
2006
- 2006-01-23 MX MX2007008937A patent/MX2007008937A/en unknown
- 2006-01-23 JP JP2007552329A patent/JP2008528118A/en not_active Withdrawn
- 2006-01-23 AU AU2006209185A patent/AU2006209185B2/en not_active Expired - Fee Related
- 2006-01-23 EP EP06719185A patent/EP1855627A2/en not_active Withdrawn
- 2006-01-23 WO PCT/US2006/002234 patent/WO2006081164A2/en active Application Filing
- 2006-01-23 CA CA002595806A patent/CA2595806A1/en not_active Abandoned
Also Published As
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AU2006209185B2 (en) | 2008-08-21 |
WO2006081164A3 (en) | 2007-03-29 |
JP2008528118A (en) | 2008-07-31 |
WO2006081164A2 (en) | 2006-08-03 |
MX2007008937A (en) | 2007-10-10 |
EP1855627A2 (en) | 2007-11-21 |
AU2006209185A1 (en) | 2006-08-03 |
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