Liquid brace

• US 6,409,691 B1
• Filed: 08/02/1999
• Issued: 06/25/2002
• Est. Priority Date: 08/02/1999
• Status: Expired due to Term

• Current Assignee: Daos Limited
• Original Assignee: Daos Limited
• Inventors: Hacking, S. Adam, Dakin, Edward B.
• Primary Examiner(s): Brown, Michael A.
• Application Number:
  US09/366,344
• Time in Patent Office: 1,058 Days
• Field of Search: 602/5, 602/13, 128/DIG.20, 601/15, 601/152
• US Class Current: 602/5
• CPC Class Codes: A61F 2007/0054 with a closed fluid circuit, e.g. hot water
• CPC Class Codes: A61F 5/012 inflatable
• CPC Class Codes: A61F 5/34 Pressure pads filled with air or liquid valves specially adapted for medical use A61M39/00; connection of valves to inflatable elastic bodies B60C29/00; valves per se F16K
• CPC Class Codes: A61H 9/0078 with intermittent or alternately inflated bladders or cuffs mattresses for preventing bed-sores with alternated pressurized chambers A61G7/05776
• CPC Class Codes: A61H 9/0085 Inflated by user's body movement, e.g. ambulatory devices
• CPC Class Codes: Y10S 128/20 Inflatable splint

Abstract

A brace has a number of flexible compression bags filled with liquid disposed around the injured body part. The liquid is pressurized by a pump, which may be driven by muscle contracting or weight-bearing activities. The pump may provide a dynamic, oscillatory pressure, or a constant pressure, which pressure may be equal to the normal resting liquid pressure in the injured limb. The bags are segmented with valves allowing the liquid to flow in a controlled manner through the bags. The bags may be containing bags, or may be selectively placed to create pressures to resist specific injury effects and potential deformations when healing.

Claims

1. A brace for supporting an injured body part of wearer, comprising:

at least one flexible compression bag containing a liquid;

a plurality of valves, each valve having a first open position and a second closed position, said valves segmenting said at least one compression bag into serially arranged bag sections and arranged to provide liquid flow in a controlled manner through said at least one compression bag.

2. The brace of claim 1, further comprising a pump for pumping liquid through said at least one compression bag.

3. The brace of claim 2, wherein said valves are one-way valves or computer controlled solenoid valves.

4. The brace of claim 2 wherein said pump comprises an electric pump having a control for controlling the temperature of the liquid exiting from the pump.

5. The brace of claim 2 wherein said pump comprises at least one flexible compression bag forming at least a portion of an annulus for encircling a healthy body part which expands on muscle contraction.

6. The brace of claim 2 further comprising at least one return tube such that an outlet of each of said at least one compression bag is connected to an inlet of said pump whereby said pump re-circulates liquid in said at least one compression bag.

7. The brace of claim 2 wherein said pump comprises a manually operated cylinder.

8. The brace of claim 2 wherein said pump comprises an electric pump having a control for generating a pulse of liquid at a selected rate and quantum mimicking a heart rate of a wearer.

9. The brace of claim 2 wherein said pump comprises a continuous passive motion machine.

10. The brace of claim 2 including a port for, when open, allowing liquid to be admitted or discharged from said at least one compression bag.

11. The brace of claim 2 wherein said at least one compression bag forms an annulus for reception of the injured body part.

12. The brace of claim 2 further comprising a layer of material surrounding said at least one compression bag, said material allowing the skin to breathe naturally when said at least one compression bag is placed against the skin.

13. The brace of claim 2 wherein said at least one compression bag comprises at least two compression bags.

14. The brace of claim 16 wherein said brace comprises a housing for releasably holding said at least two compression bags about an injured body part of a wearer.

15. The brace of claim 1 wherein said liquid is water.

16. The brace of claim 1 wherein said at least one flexible compression bag comprises segments disposed one above another such that, but for said valves, gravity acting on said liquid would elevate pressure in lower ones of said segments higher than in upper ones of said segments.

17. The brace of claim 1 wherein said at least one flexible compression bag is partially distended by said liquid so as to apply a resting pressure.

18. A brace for supporting an injured body part of a wearer, comprising:

at least one flexible compression bag adapted for holding a liquid;

a plurality of valves segmenting said at least one compression bag and arranged to provide liquid flow in a controlled manner through said at least one compression bag;

a pump for pumping liquid through said at least one compression bag

a liquid reservoir in fluid communication with said at least one flexible compression bag for providing a static pressure in said at least one compression bag.

19. A brace for supporting an injured body part of a wearer, comprising:

at least one flexible compression bag adapted for holding a liquid;

a plurality of valves segmenting said at least one compression bag and arranged to provide liquid flow in a controlled manner through said at least one compression bag;

a pump for pumping liquid through said at least one compression bag

wherein said pump comprises a pivoted pump plate with the pivot located approximately at the center of weight-bearing when a wearer of the brace is standing and a pair of flexible pump bags, one on each side of said pivot, each pump bag connected between an inlet and outlet of at least one of said at least one compression bag, said pump plate arranged for attachment to a foot of the wearer such that, in use, one pump bag is disposed under a sole of said wearer and another pump bag is disposed under a heel of said wearer.

20. The brace of claim 19 wherein said valves are solenoid valves and further comprising solenoid valve actuators associated with said bellows.

21. The brace of claim 20 wherein said solenoid valve actuators comprise proximity sensors or microswitches.

22. A brace for supporting an injured body part of a wearer, comprising:

at least one flexible compression bag adapted for holding a liquid;

a pump;

conduit extending between said at least one flexible compression bag and said pump;

said pump comprising an annular member adapted for encircling a healthy body part which expands on muscle contraction, said annular member comprising a flexible pump bag such that upon muscle contraction, liquid is pumped from said flexible pump bag to said at least one flexible compression bag, said brace further comprising a plurality of valves, each valve having a first open position and a second closed position, said valves segmenting said at least one compression bag and arranged to provide liquid flow in a controlled manner through said at least one compression bag.

23. The brace of claim 22 wherein said at least one compression bag forms an annulus for reception of the injured body part.

24. The brace of claim 22 further comprising at lest one return conduit such that an outlet of each of said at least one flexible compression bag is connected to an inlet of said pump whereby said pump re-circulates liquid in said at least one flexible compression bag.