Soft-goods type, formable orthopaedic cast

• US 4,996,979 A
• Filed: 10/13/1989
• Issued: 03/05/1991
• Est. Priority Date: 10/13/1989
• Status: Expired due to Term

• Current Assignee: Ossur hf
• Original Assignee: Royce Medical Company (Ossur hf)
• Inventors: McGinniss, Vincent, Guza, David E., Grim, Tracy E., Hughes, Kenneth E., Easter, David A., Whitmore, Robert S. Jr., Carpenter, Timothy J.
• Primary Examiner(s): Hafer, Robert A.
• Assistant Examiner(s): BROWN, MICHAEL A
• Application Number:
  US07/420,920
• Time in Patent Office: 508 Days
• Field of Search: 128/89 R, 128/87 R, 128/91 R, 128/877, 128/878, 128/90, 128/91 A, 128/77, 128/165, 128/881, 128/882, 128/846, 128/847, 128/88, 128/879
• US Class Current: 602/21
• CPC Class Codes: A61F 13/04 Plaster of Paris bandages; Other stiffening bandages A61F13/06 - A61F13/15 take precedence
• CPC Class Codes: A61F 5/05841 for the limbs A61F5/05816, A61F5/05833 take precedence

Abstract

A soft goods type foldable, wrappable sleeve orthopedic cast immobilizes and conforms to the shape and configuration of a limb, or other part of the anatomy. The soft-goods type cast assembly is initially specially formed or configured to specifically fit a selected portion of the anatomy of a patient. The cast conforms to the anatomy through the use of airtight and moisture-proof pouches which encapsulate either (1) open cell or fiberglass matrices impregnated with a water-activated hardenable pre-polymer, or (2) the entire assembly. After the tightening of the cast around the limb, the application of water activates the urethane polymer which conforms to the configuration of the limb encased. Supplemental bendable ribs may be employed to splint the limb prior to activation of the hardenable material. The soft goods type cast is held in place by straps, and may be removed or adjusted by releasing or tightening the straps. The splinting elements may be removed and replaced. An inlet duct may have a capsule in it with some of the chemical material which aids in polymerization of the urethane. A venting duct may also be provided to permit the escape of air or gases. The water activated pre-polymer material may include two isocyanate pre-polymers of significantly different viscosities and equivalent weights.

Claims

1. An orthopaedic soft-goods type cast assembly comprising:

a flexible casing, for enclosing a limb or other portion of the anatomy, having a substantial extent and opposed edges;

said casings being manufactured or initially formed or tailored specifically to fit a selected portion of the anatomy of a patient, and having an initial irregular contour or pattern which follows the irregular and unique shape of said selected portion of the anatomy;

means for holding the two outer edges of said casing toward one another and securing said casing onto a limb or the like adjustably to accommodate variations in swelling;

liquid or gas permeable material impregnated with an activatable, hardenable material which structurally conforms to said portion of the anatomy when activated, said permeable material being mounted to and secured to conform with the configuration of said casing;

a gas and water impervious pouch for preventing premature activation of said hardenable material;

means for activating said hardenable material to form a cast or a splint for the limb or other portion of the anatomy;

said activatable material constituting a pre-polymer;

means for polymerizing said activatable hardenable material;

isolation means for enclosing said polymerizing means within a thin layer of water soluble material; and

means for providing access to said isolation means and to said activatable hardenable material by water, whereby said isolation means is dissolved, and said polymerizing means and said water activates said hardenable material, causing polymerization thereof, and hardening.

2. An assembly as defined in claim 1 wherein said polymerizing means is located in a capsule having a water soluble outer layer, in an input duct for supplying water to said activatable hardenable material.

3. An assembly as defined in claim 1 wherein said polymerizing means is physically located adjacent said activatable, hardenable material but is separated therefrom by the water soluble isolation means.

4. An orthopaedic soft-goods type cast assembly as defined in claim 1 wherein straps are provided for securing the edges of said casing together.

5. An orthopaedic soft-goods type cast assembly as defined in claim 1 wherein said gas and water impervious pouch encloses the entire soft-goods cast assembly.

6. An orthopaedic soft-goods type cast assembly as defined in claim 1 wherein said gas and water impervious pouch is formed as a part of said assembly which directly encloses said impregnated liquid permeable assembly.

7. An orthopaedic soft-goods type cast assembly as defined in claim 1 including an inlet for supplying fluid to the impregnated liquid permeable material, and a vent outlet to permit the escape of air or other gases from the liquid permeable material so that the fluid may freely permeate the liquid permeable material.

8. An orthopaedic cast assembly as defined in claim 1 wherein said activating means includes an entry port on the outer surface of said assembly and means for directing water through said entry port to contact the contents of said pouch.

9. An orthopaedic soft goods type cast assembly as defined in claim 1 wherein said activatable, hardenable material is a urethane pre-polymer.

10. An orthopaedic soft-goods type cast assembly as defined in claim 1 wherein said activatable, hardenable material is made up of two isocyanate pre-polymers, one having a viscosity less than 500 centipoise and the other having a viscosity greater than 1,000 centipoise.

11. An orthopaedic soft-goods type cast assembly as defined in claim 1 wherein said activatable, hardenable material is made up of two isocyanate pre-polymers, one having a viscosity less than 200 centipoise and the other having a viscosity greater than 4,000 centipoise.

12. An orthopaedic soft-goods type cast assembly comprising:

a flexible casing for enclosing a limb or other portion of the anatomy having a substantial extent and opposed edges;

said casings being manufactured or initially formed or tailored specifically to fit a selected portion of the anatomy of a patient, and having an initial irregular contour or pattern which follows the irregular and unique shape of said selected portion of the anatomy;

means for holding the two outer edges of said casing toward one another and securing said casing onto a limb or the like adjustably to accommodate variations in swelling;

an activatable, hardenable material which structurally conforms to said limb when activated, said activatable, hardenable material being mounted to and secured to conform with the configuration of said casing;

means for activating said hardenable material to form a cast or a splint for the limb or other portion of the anatomy;

said activatable material constituting a pre-polymer;

means for polymerizing said activatable hardenable material;

isolation means for enclosing said polymerizing means within a thin layer of water soluble material; and

means for providing access to said isolation means and to said activatable hardenable material by water, whereby said isolation means is dissolved, and said polymerizing means and said water activates said hardenable material, causing polymerization thereof, and hardening.

13. An assembly as defined in claim 12 wherein said polymerizing means is located in a capsule having a water soluble outer layer, in an input duct for supplying water to said activatable hardenable material.

14. An assembly as defined in claim 12 wherein said polymerizing means is physically located adjacent said activatable, hardenable material but is separated therefrom by the water soluble isolation means.

15. An orthopaedic soft-goods type cast assembly as defined in claim 12 further comprising a gas and moisture impervious pouch for preventing premature activation of said hardenable material.

16. An orthopaedic soft-goods type cast assembly as defined in claim 15 wherein said air and water impervious casing encloses the entire soft-goods cast assembly.

17. An orthopaedic soft-goods type cast assembly as defined in claim 15 wherein said gas and water impervious casing is a pouch which formed a part of said assembly and which directly encloses said impregnated liquid permeable assembly.

18. An orthopaedic soft-goods type cast assembly as defined in claim 12 wherein said activatable, hardenable material is made up of two isocyanate pre-polymers, one having a viscosity less than 500 centipoise and the other having a viscosity greater than 1,000 centipoise.

19. An orthopaedic soft-goods type cast assembly as defined in claim 12 wherein said activatable, hardenable material is made up of two isocyanate pre-polymers, one having a viscosity less than 200 centipoise and the other having a viscosity greater than 4,000 centipoise.

20. An orthopaedic soft-goods type cast assembly comprising:

a flexible casing for enclosing a limb or other portion of the anatomy having a substantial extent and opposed edges;

said casings being manufactured or initially formed or tailored specifically to fit a selected portion of the anatomy of a patient, and having an initial irregular contour or pattern which follows the irregular and unique shape of said selected portion of the anatomy;

means for holding the two outer edges of said casing toward one another and securing said casing onto a limb or the like adjustably to accommodate variations in swelling;

liquid or gas permeable material impregnated with an activatable, hardenable material which structurally conforms to said limb when activated, said liquid permeable material being mounted to and secured to conform with the configuration of said casing;

means for activating said hardenable material to form a cast or a splint for the limb or other portion of the anatomy; and

said assembly including an inlet for supplying activation to the impregnated liquid permeable material, and a vent outlet to permit the escape of air or other gases from the liquid or gas permeable material so that the fluid may freely permeate the liquid permeable material;

said activatable material constituting a pre-polymer;

means for polymerizing said activatable hardenable material;

isolation means for enclosing said polymerizing means within a thin layer of water soluble material; and

means for providing access to said isolation means and to said activatable hardenable material by water, whereby said isolation means is dissolved, and said polymerizing means and said water activates said hardenable material, causing polymerization thereof, and hardening.

21. An assembly as defined in claim 20 wherein said polymerizing means is located in a capsule having a water soluble outer layer, in an input duct for supplying water to said activatable hardenable material.

22. An assembly as defined in claim 20 wherein said polymerizing means is physically located adjacent said activatable, hardenable material but is separated therefrom by the water soluble isolation means.

23. An orthopaedic soft-goods type cast assembly comprising:

a flexible casing, for enclosing a limb or other portion of the anatomy, having a substantial extent and opposed edges;

means for holding the two outer edges of said casing toward one another and securing said casing onto a limb or the like adjustably to accommodate variations in swelling;

liquid or gas permeable material impregnated with an activatable, hardenable material which structurally conforms to said portion of the anatomy when activated, said permeable material being mounted to and secured to conform with the configuration of said casing;

a gas and water impervious pouch for preventing premature activation of said hardenable material;

means for activating said hardenable material to form a cast or a splint for the limb or other portion of the anatomy;

said activatable material constituting a pre-polymer;

means for polymerizing said activatable hardenable material;

isolation means for enclosing said polymerizing means within a thin layer of water soluble material; and

means for providing access to said isolation means and to said activatable hardenable material by water, whereby said isolation means is dissolved, and said polymerizing means and said water activates said hardenable material, causing polymerization thereof, and hardening.

24. An orthopaedic soft-goods type cast assembly as defined in claim 23 wherein straps are provided for securing the edges of said casing together.

25. An orthopaedic soft-goods type cast assembly comprising:

a flexible casing, for enclosing a limb or other portion of the anatomy, having a substantial extent and opposed edges;

means for holding the two outer edges of said casing toward one another and securing said casing onto a limb or the like adjustably to accommodate variations in swelling;

liquid or gas permeable material impregnated with an activatable, hardenable material which structurally conforms to said portion of the anatomy when activated, said permeable material being mounted to and secured to conform with the configuration of said casing;

means for activating said hardenable material to form a cast or a splint for the limb or other portion of the anatomy;

means for polymerizing said activatable hardenable material; and

said activatable, hardenable material being made up of two isocyanate pre-polymers, one having a viscosity less than 500 centipoise and the other having a viscosity greater than 1,000 centipoise.

26. An orthopaedic soft-goods type cast assembly as defined in claim 25 wherein said one isocyanate pre-polymer has a viscosity less than 200 centipoise, and said other isocyanate pre-polymer has a viscosity above 4,000 centipoise.