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WO1997018788A1 - Botte autogonflante contre les affections veineuses - Google Patents

Botte autogonflante contre les affections veineuses Download PDF

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Publication number
WO1997018788A1
WO1997018788A1 PCT/US1995/015120 US9515120W WO9718788A1 WO 1997018788 A1 WO1997018788 A1 WO 1997018788A1 US 9515120 W US9515120 W US 9515120W WO 9718788 A1 WO9718788 A1 WO 9718788A1
Authority
WO
WIPO (PCT)
Prior art keywords
air
person
leg
chamber
pressure
Prior art date
Application number
PCT/US1995/015120
Other languages
English (en)
Inventor
Ibrahim M. Ibrahim
Sharon Caruth Ibrahim
Original Assignee
Ibrahim Ibrahim M
Sharon Caruth Ibrahim
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 Ibrahim Ibrahim M, Sharon Caruth Ibrahim filed Critical Ibrahim Ibrahim M
Priority to PCT/US1995/015120 priority Critical patent/WO1997018788A1/fr
Priority to EP95942869A priority patent/EP0805670A4/fr
Priority to AU44077/96A priority patent/AU4407796A/en
Publication of WO1997018788A1 publication Critical patent/WO1997018788A1/fr

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
    • A61H9/00—Pneumatic or hydraulic massage
    • A61H9/005—Pneumatic massage
    • A61H9/0078—Pneumatic massage with intermittent or alternately inflated bladders or cuffs
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
    • A61H9/00—Pneumatic or hydraulic massage
    • A61H9/005—Pneumatic massage
    • A61H9/0078—Pneumatic massage with intermittent or alternately inflated bladders or cuffs
    • A61H9/0085—Inflated by user's body movement, e.g. ambulatory devices

Definitions

  • the present invention relates to a compression apparatus for applying cyclic external pressure to the outer surface of a person's leg or other limb.
  • the present invention relates to compression apparatus worn against the outer surface ofthe lower leg for reducing and controlling the discomfort and disease caused by va ⁇ ous venous disorders occurring in the lower leg.
  • BACKGROUND OF THE INVENTION AND DISCUSSION OF PRIOR ART Venous disease is a common disorder that effects millions of people. The disease in many respects is more complex than arterial disease which is largely the result of obstructions in the vessels; however, the criticality of arterial disease and availability of various treatments has helped to focus the medical community's attention towards arterial disease instead of venous disease. Venous disease effects many more people than those specifically identified and treated.
  • the obvious function ofthe venous system is to return blood to the heart from the capillary beds.
  • the veins also play a role in regulating vascular capacity and are part of a peripheral pump mechanism which assists the heart in the transport of blood during exercise.
  • the large superficial veins are relatively thick walled and easily visible structures which lie just beneath the skin.
  • the deep veins are thin walled vessels lying deep within the musculature and are often accompanied by arteries. These deep veins are responsible for the majority of blood flow back to the heart and are often three times larger than the cross sectional area ofthe adjacent artery.
  • Veins are passive conduits that contain one-way valves for unidirectional flow towards the heart. Venous disease is caused by either blockage ofthe deep veins in the leg or by incompetent valves in the veins of the legs. The resultant effect is an increase in pressure in the collateral venous circulation of the leg.
  • the method of blood flow from the leg to the heart in an erect or active person is the muscle pump.
  • the muscles contract, squeezing and emptying the veins.
  • the blood flows in the vein towards the heart as a result ofthe one-way valve. Repetitive contraction of the muscles results in the continuous movement of venous blood antegrade towards the heart. If the valves are incompetent, blood can flow in either direction. If the vein is obstructed, blood flows only retrograde to make the valves appear incompetent. In either case for venous disease the normal muscle pump not only does not return blood to the heart, but actually increases the pressure in the leg.
  • blood that would normally flow upward in the vein may exert enough back pressure to damage the adjacent valve. Thereafter, the damaged valve allows blood to be forced backward toward the foot. After such damage has occurred, the muscle pump not only does not effectively return blood to the heart but actually increases the pressure in the foot, as shown in Fig. 2, whether or not there is an obstruction.
  • Valves may be incompetent for a number of reasons other than thrombosis. The incompetent valve will allow blood to flow away from the heart thus causing increase venous pressure in the foot.
  • veins in the leg such as the femoral vein 10 contain cusp-shaped valve flaps 12 that allow blood flow upward per arrow 13, and under normal conditions meet to prevent blood from flowing in the downward direction indicated by the arrow 14 toward the patient's foot.
  • an obstruction 16 develops in the vein impeding blood flow per arrow 15
  • damage to these flaps may result when blood pressure in the vein below the obstruction is locally increased.
  • Such pressure rise occurs when there is contraction ofthe adjacent leg muscle causing the inward-directed pressure indicated by arrows 17 in Fig. 3 A and the resulting constriction 18.
  • Valve flaps 12 below the constriction 18 are subjected to excessive back pressure that may stretch or tear the inner edge 19 of a valve cusp. This damage renders the valve incompetent for the task of preventing the downward flow of blood in the veins ofthe leg. It is estimated that there are 4,880,000 new cases of venous disease treated each year.
  • the treatment for this disorder involves three modalities, all of which rely on the same basic principle, namely the application of external pressure on the lower extremity to counteract the increased pressure on the collateral circulation. Apparatus for these three treatments are described as follows.
  • the first modality is the application of so called compression or surgical stockings.
  • Elastic stockings are commonly worn by persons having venous disease such as venous ulcers, incompetent venous valves, deep venous thrombosis and varicose veins to prevent the swelling ofthe feet and lower legs.
  • This compression stocking is an Ace 4 bandage.
  • Compression devices such as surgical stockings that diminish the extravasation of fluid, thereby retarding the formation of edema, have been the mainstay of therapy for the above described problem.
  • the constant compression provided by these stockings does not correct the repetitive, ha ⁇ nful increase in back pressure that is produced by contraction ofthe patient's leg muscles during walking.
  • Such devices recreate the dynamic, repetitive increase in the blood flow that occurs in healthy veins as the patient's leg muscles contract during walking.
  • the second modality is the so-called Unna * boot or Dome * paste.
  • This is a medicated bandage that is applied circumferentially over the leg starting at the toes and extending all the way up to the knee.
  • This is a semi-rigid dressing in that it is not as flexible as the surgical stockings, but also not as rigid as a plaster cast. This is the type usually used in cases of open ulcerations. After use this dressing cannot be removed for a few days, but once it is removed, a new one has to be applied. Also, it cannot be allowed to get wet. If it is too tightly applied, it may impede the circulation, thus jeopardizing the extremity.
  • the Unna boot is considered by some as more effective than the surgical or compression stocking since it has a semi-rigid quality.
  • the third modality is the intermittent pneumatic compression device, namely, a plastic boot that can be pressurized by a pump.
  • This device is applied on the leg and then attached to a compressor which pumps air into the device to a pre-set pressure, lets it remain there for a few seconds, and then releases it. This is best used to relieve very significant edema in the extremities.
  • this system of boot and compressor is heavy and cannot be used continuously. Thus, its use is mainly confined to the hospital or the patient's home, and obviously, with this device the patient has little or no mobility.
  • a principal object ofthe present invention is to treat venous disease ofthe leg by providing dynamically variable compression to the outer surface ofthe lower leg.
  • a further object of this invention is to reduce or prevent additional damage to already damaged veins in the leg. More particularly, we seek to recreate a dynamic and repetitive increase ofthe pressure on the extremity from the foot upwards as the leg muscles contract. Thus, we seek to counteract the repetitive increase in the retrograde pressure on the lower extremity by muscular contraction.
  • a still further object of this invention is to provide a convenient, comfortable and totally mobile apparatus for applying dynamic pressure to wearer's lower leg, the apparatus preferably being a boot worn on the leg.
  • Another objective is to provide a mobile dynamic compression apparatus for the lower leg where the user can inflate a pressure chamber merely by walking with no requirement for a pump or other external source of compressed air.
  • an apparatus generally in the form of a boot which includes (a) a pressure application means such as an air cell or resilient air chamber situated adjacent the wearer's lower leg, (b) a pump means such as a compressible and resilient bulb or air chamber situated below the wearer's heel, (c) a fluid conduit means, such as a tube providing an air passage between the pump means and the pressure application means, and (d) appropriate valve means.
  • a pressure application means such as an air cell or resilient air chamber situated adjacent the wearer's lower leg
  • a pump means such as a compressible and resilient bulb or air chamber situated below the wearer's heel
  • a fluid conduit means such as a tube providing an air passage between the pump means and the pressure application means
  • appropriate valve means such as a tube providing an air passage between the pump means and the pressure application means.
  • This cyclic air pressure is supplied by a pump preferably situated below the person's heel so that as he walks each step downward on the heel actuates the pump to drive air into the bladder. Further stepping off the heel releases the pump to draw air back.
  • This cyclic pressure applied to the blood vessels within the leg substitutes for or supplements the pumping action that would occur in a normal healthy leg by contractions of the calf muscle. Because the venous disease greatly diminishes this pumping effect, the expanded air cell or bladder will apply a substitute pressure to drive the blood upward and not let excessive pressure develop below the obstacle or damaged valve.
  • the bladder and pump comprise a closed air system.
  • a valve device is provided to allow tbis system to operate selectively in any of three modes: inflation ofthe system, cyclic pressure mode during walking, and deflation ofthe system. Inflation may be from an external source of compressed air, or preferably is achieved by appropriate operation of valves as the user takes a number of steps, hence the title herein "Self-Inflating Venous Boot.”
  • a charge of air is drawn into the system by expansion ofthe pump when the foot is lifted; as the person steps down air is then driven by the pump into the bladder. This procedure is repeated a number of time until the system is adequately inflated to approximately 50 mm of Hg.
  • the system is then closed and isolated from further inlet air, such that air merely reciprocates between the pump and the bladder as the person walks.
  • the pressure can be increased or decreased as required by inlet or release of air from the system, and when desired the system can be fully deflated by opening the system via appropriate valve means to the atmosphere.
  • the preferred embodiment disclosed herein includes a single compact valve unit that allows all ofthe above-described modes of operation.
  • the bladder or pressure chamber is situated in the area slightly below the knee (4 to 5 cm below the patella), covering the calf to the ankle and metatarsal area.
  • This bladder may fully surround the leg or pressure may be applied to selected areas ofthe leg.
  • the pumping action is achieved merely by walking and using the person's own weight, with no additional muscle effort required and no additional or external power source or apparatus required.
  • This inflatable bladder is sufficiently flexible to generally conform to the shape ofthe calf and leg and distribute the pressure substantially evenly and cause minimum discomfort.
  • the apparatus is designed to avoid hard contact or excessive pressure with the protruding malleolus ofthe tibia and fibula.
  • the pump is configured to fit within a relatively normal appearing shoe, and the primary pressure-applying chamber is a sleeve or boot-like member that surrounds or is situated against the lower leg.
  • additional compression means is provided by an elastic sock or partial sock surrounding the instep or portion ofthe foot forward ofthe ankle including or not including the toes.
  • the pump in one convenient form is a resilient elastic chamber that is compressed by heel pressure and upon absence of heel pressure expands naturally and draws air back into it from the bladder.
  • the valve means for this air system comprises various valve functions which may be separate valves or as in the preferred embodiment are combined into a single device.
  • inflation mode air is allowed by an inlet check valve to enter the system but not escape; then air must flow from the pump into the bladder but not return to the pump.
  • air must freely reciprocate between the pump and the bladder.
  • release mode air must be free to exit the system and deflate the bladder.
  • the boot or bladder has an inner surface or layer of fleece or other natural or synthetic material that is soft and washable, allows movement of air or perspiration on the surface ofthe leg, and permits application of medication to the skin if necessary.
  • the bladder itself may be formed of a sheet or cuff that is wrapped around and secured to the leg, and subsequently inflated so as to apply pressure inward against the leg.
  • Alternative pressure means may be used against specified parts ofthe leg.
  • one or more semi-rigid sheets such as a set of front and rear sheets encase the leg with the bladder or other elastic air chamber between the leg and an inner surface of a shell. Inflation ofthe chamber within the confined space between the shell results in pressure application against the leg.
  • Fig. 1 is prior art showing a sequence of venous volume changes in the calf with walking.
  • Fig. 2 is prior art showing a sectional view of a femoral valve in its pre-repair damaged state and post-repair after the leading edge of casp was shortened.
  • Fig. 3 A is prior art showing a schematic representation ofthe affect of an obstruction in a vein on valve action in the vein.
  • Fig. 3B is prior art showing a schematic representation ofthe affect of an incompetent valve on antigrade venous circulation.
  • Fig. 4 is a schematic drawing showing the pressure system of this invention comprising a pump, valves, and an air cell pressure chamber.
  • Fig. 5 is a side elevation view ofthe new self inflating venous boot.
  • Fig. 6 is similar to 6 A and is cut away to show components ofthe new venous boot.
  • Fig. 7 is a side elevation view similar to Fig. 6B showing further detail ofthe construction ofthe boot in another embodiment.
  • Fig. 8 is a rear perspective view ofthe boot of Fig. 7 showing additional construction thereof.
  • Fig. 9 is a fragmentary view ofthe boot showing the valve inserted in a holding cover.
  • Fig. 10 is a plan view ofthe fabric pattern form for constructing the air cell or air pressure chamber.
  • Fig. 10A is a sectional view taken along lines A and A of Fig. 10.
  • Fig. 11 A-l IE are views ofthe pump, respectively of top plan, left side elevation, first sectional, rear end, second sectional, and third sectional views.
  • Fig. 12 is a front elevation view of a preferred embodiment ofthe valve assembly.
  • Fig. 13 is an enlarged sectional view ofthe valve assembly of Fig. 12 with the valve assembly switched for "Inflation” and operating in "Bladder Fill” mode.
  • Fig. 14 is a view similar to Fig. 13 with the valve assembly switched for "Inflation” and operating in "Foot Pump Fill” mode.
  • Fig. 15 is a view similar to Fig. 13 with the valve assembly switched for "Walking” and operating in "Reciprocating" mode.
  • Figs. 1, 2 and 3 are schematic illustrations of prior art human anatomy which were discussed earlier on pages 2-3 ofthe specification herein.
  • Fig. 1, parts A-E shows a sequence of venous volume changes in the calf with walking, wherein A represents resting, B represents the heel pressed against a support (early muscle contraction), C represents the entire foot pressed against a support (muscles fully contracted), D represents the knee flexed (forefoot compressed to floor, soleus contracted, gastrocnemius relaxed), and E represents the foot now unloaded (all muscles relaxed).
  • Fig. 2 parts A and B, illustrate femoral valve cusps pre- and post repair.
  • Part A the valve cusp was loose and floppy and severely incompetent.
  • Part B the valve was completely competent.
  • the valve repair involves placement of a series of interrupted sutures designed to shorten the leading edge ofthe valve cusp. Interrupted sutures are placed repeatedly until the leading edge of each cusp lies gently across the surface ofthe vein, and is neither taut nor lax.
  • Figs. 3 A and 3B are described in detail on page 2 and 3 above.
  • the preferred embodiment ofthe new invention is shown in Fig. 6B as applied to a person's leg and in Fig. 4 in schematic form.
  • the components as seen in Fig. 4 are a pump 20, a switchable valve 22, a bladder or flexible air chamber 24, an inlet check valve 25, a one-way valve 26 and a pressure gage 27. Between valve 22 and bladder 24 is an inflating line 28 and a separate exchange line 29. In use the bladder 24 is applied to or wrapped around and secured to the patient's leg.
  • Valve 22 is switched to open the line 28 to pump 20, and to close the line 29 to pump 20.
  • a compression stroke of pump 20 as applied by the person's heel when walking drives air via open line 28 through one-way valve 26 into the bladder. This air cannot escape via line 29 which is closed by valve 22; the air cannot escape via line 28 because of one-way valve 26.
  • the person's heel lifts off the pump which then expands and draws in air from the atmosphere via inlet valve 25 while outlet valve 23 is closed.
  • the heel compresses the pump and drives this additional charge of air through line 28 into the bladder further inflating it. This charge of air from the pump cannot flow elsewhere than to the bladder, because valve 22 is closed to line 29 and valve 27 is one- way "in” only.
  • the bladder is adequately inflated, which can be verified by pressure gage 27.
  • inlet valve 25 is closed by control 25 A, and valve 22 is switched to open line 29 between pump and bladder 24 and to close line 28 from the pump to the bladder.
  • initial inflation could be from an external source of compressed air instead of by suction from the pump operation.
  • the optional alternate air source is indicated as 25B and a dotted line communicating with valve 25 and control 25 A.
  • venous boot 30 also called AirSoc* or Self-Inflating Boot ofthe present invention is shown generally schematically in Figs. 5-8.
  • the venous boot 30 comprises the wrap around outer shell 32, the Velcro® tabs 34 for adjustably securing the boot around the foot and calf, the valve assembly 36 which is located in a convenient place for the user to reach and operate with one hand, and a valve assembly/tube cover 38 which houses the valve conveniently in the vicinity ofthe person's ankle.
  • Fig. 10 shows the outer shell 32 in its flat form as a two-layer sheet 50 having a generally trapezoidal shape with top edge 51 A and bottom edge 5 IB. The peripheral edges of the two layers are sealed to form an inflatable bladder which is described in greater detail later.
  • Fig. 6 is a partially cut away view ofthe venous boot of Fig. 5 and illustrates the bladder or air chamber 40 divided into separate pockets 40 A, 40B, 40C etc.
  • a lower sock 42 is situated at the bottom ofthe boot for surrounding or encasing the middle ofthe user's foot. Adjacent the lower sock is the upper sock portion 43, and at the top ofthe upper sock is the valve assembly housing 37. Situated below the user's foot and situated within a pocket at the bottom ofthe lower sock or below and adjacent lower sock bottom is an innersole pump 44. From the innersole pump is a connector tube 46 which extends to the valve assembly 36 in housing 37. An outlet tube directs air from the valve 36 into the bladder 40.
  • Figs. 7 and 8 illustrate further details ofthe construction ofthe lower and upper sock or slight variation thereof for this boot.
  • the same reference numbers are used for similar components as in Fig. 6.
  • the boot's outer shell 32 has a lower part 32A which is joined to the upper sock 43 along a seam 45.
  • An additional seam 47 is shown joining the lower sock 42 to the upper sock 43 as shown in Figs. 7 and 8.
  • There is stitching 48 forming a path for the tubing 46 on the mside ofthe sock.
  • This tubing 46 leads to the valve 22 situated in valve assembly housing 37. Obviously it is important that tubing 46 be situated and protected such that it will not get pinched and block any air flow from pump 44 (Fig. 6) to the valve 36.
  • valve is situated in this embodiment at the rear of and slightly above the ankle so that it is easily accessible but not likely to interfere with walking or be struck by the opposite foot or by anything against which the leg is likely to brush.
  • the lower sock 42 is elastic that is stretched circumferentially when put on the foot and applies inward compression to the foot.
  • Upper sock 43 is made ofthe same elastic to snugly encompass the heel and the remainder ofthe foot rearward ofthe lower sock.
  • the elastic may be generally similar to the elastic strip used in an ACE * bandage.
  • Fig. 9 shows greater detail ofthe valve assembly housing or pocket 37 wherein valve
  • valve assembly 36 is situated.
  • the valve assembly 36 is positioned to engage and seal with the upper end of tube 46.
  • a lever or knob for the user to easily actuate the valve between its various modes of operation.
  • Fig. 10 shows a cutout pattern or form for the bladder or air pressure chamber.
  • This form is somewhat butterfly- shaped in appearance, with a central part 52 with opposite left and right or side wings 53A and 53B.
  • These wings have mating tab parts with Velcro® tape 54A and 54B respectively so that the central part 52 can be wrapped around a person's leg, and then tab 54B can be flapped over to engage the mating Velcro® tab 54A.
  • the Velcro® tape is situated such that it can engage in a variety of different positions, and thus the tightness of the boot wrapped around the leg can be easily adjusted.
  • There are smaller wings 55 A and 55B which engage similarly as the other wings at the lower part ofthe leg below the calf.
  • FIG. 10A shows a cross-sectional view ofthe boot webbing of Fig. 10. As is apparent this web is formed of two layers 52A on the inside and 52B on the outside. These layers are joined together by heat sealed welds at numerous places represented by the example 56. As can be seen in Figs. 10 and 10A the air chamber extends through the majority ofthe web except that internal air flow must pass around any of these welded areas 56 which join and secure layers 52A and 52B together. This is to prevent 52 A and 52B from billowing out into the shape of a balloon.
  • this bladder can be inflated so that inside surface 52A presses in the direction of 52C (See Fig. 10 A) while retaining its general shape in the form of a mattress.
  • These various welded areas 56 optionally and as shown have apertures 59 punched therethrough to allow air to flow in through the boot and onto the patient's skin or sock or other covering that he might be wearing.
  • Fig. 10 further shows the pocket area 59P for receiving and holding the valve 36 if appropriate cutouts are made for tube 46 from the pump to reach and connect with the valve and for another tube to extend from the valve to an inlet nipple (not shown) into the bladder.
  • the air chamber ofthe bladder ofthe preferred embodiment is two layers of 5' 2 mil polyurethane.
  • the outer layer is 420 Dernier Nylon with a 5V ⁇ mil coating of polyurethane as its inner surface.
  • the peripheral edges ofthe two polyurethane layers and various spaced intermediate areas 56 of these layers are heat sealed together.
  • the nylon fabric is generally non-stretchable to provide appropriate strength to the bladder. This fabric is available from Mann Industries Inc. of Birmingham, Massachusetts 01701.
  • Figs. 11 A-l IE show the construction ofthe foot pump (innersole pump) 44 as indicated schematically in Fig. 6. This is a one-piece molded resilient rubber or plastic device.
  • Fig. 11 A shows embodiment 60 as somewhat rectangular with the rear end 60R rounded to generally conform to the inner heel area of a person's shoe.
  • Fig. 1 IB shows that the pump 60 is tapered generally conforming to the arch of a person's foot so that top portion 60 A is positioned directly under the person's heel and arch, and lower portion 60B resides adjacent the bottom ofthe person's shoe.
  • Fig. 1 IC is a cross-sectional view of Fig. 1 IB with 62 being an aperture of inlet/outlet nipple 62 which is later connected to tube 46 as seen in Fig. 6.
  • Fig. 1 ID is a rear end elevation view
  • Fig. 1 IE is a sectional view similar to 1 ID.
  • Fig. 1 IF is a sectional view showing the inner structure ofthe device of Figs. 11 A and 1 IE.
  • Fig. 1 IF shows more clearly the outlet nipple 62 which is directed to and coupled to tubing 46.
  • this pump is a one-piece molded resilient plastic or rubber apparatus. Obviously, there are many variation constructions, including a flexible but not resilient pump chamber with an internal spring urging the pump to its expanded state.
  • the pump has an air volume of about 4-5 cubic inches, a 65% pumping efficiency, and is constructed of an 80 Durometer elastomeric material that can sustain multiple impacts at pressures of up to approximately 385 psi without rupture.
  • Figs. 12-15 show a preferred embodiment ofthe valve shown schematically in Fig. 4.
  • Fig. 12 shows a plan view ofthe valve assembly 70 as might be used for valve assembly 36 seen in Figs. 5-9.
  • Figs. 13, 14 and 15 show sectional views of this valve in three different modes of operation.
  • Valve 70 has two fittings or nozzles 71 and 72 for connection to the exchange line 29 and the inflation line 28 respectively of Fig. 4.
  • the inner structure and operation are described as follows.
  • the valve assembly 70 (designated 22, 23, 25 in Figs. 4A and 36 in Figs. 5-8) comprises a bottom or housing 73 which defines a cylindrical bore 74, a rotary piston 75, an actuator or rotary knob 76, a disc check valve 77, and a relief check valve 78.
  • This valve assembly has three modes of operation; however, first we will describe certain structural and functional features.
  • Foot Pump Fill Mode of Fig. 14 where the pump expands and draws in a new charge of air from the atmosphere.
  • the new air comes from outside the system via relief check valve 78 and passage 80.
  • the pump creates negative pressure in the system, which both draws in air via valve
  • the bladder In the operation of this valve the bladder is inflated to about 2 1/2 to 3 psi or other comfort level. In Reciprocating mode the pressure periodically spikes to about 5 psi.
  • the relief check valve includes a spring that holds this valve closed with a force of abut 0.3 pounds. During Fill mode (Fig. 13) the pump's suction is easily enough to open this valve.
  • valve assembly 70 is a very compact and efficient apparatus to handle all modes of operation with a single small mechanism, and with knob or actual movable between only two states, and finally a simple relief valve to deflate.
  • all these functions could be separated: the intake valve could be on or associated with the bladder directly and the relief valve could be on or associated with the bladder directly. Then the principal reciprocating mode would be much simpler; however, such would require three separate valves instead of one as disclosed herein.

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  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Epidemiology (AREA)
  • Pain & Pain Management (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Rehabilitation Therapy (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Veterinary Medicine (AREA)
  • Massaging Devices (AREA)

Abstract

La présente invention concerne un appareil portable (30) permettant d'exercer cycliquement une pression sur les veines de la jambe d'une personne par l'application d'une pression cyclique sur la face externe de la jambe. L'appareil comporte une première chambre à air (40) comportant une partie de paroi souple (52A) conçue pour se placer contre une face externe de la jambe, et une seconde chambre à air (44) conçue pour se placer sous le talon de la personne. La seconde chambre à air (44), qui est compressible de façon que l'air qu'elle contient en soit chassé lorsque le talon de la personne appuie sur celle-ci, peut revenir à l'état non comprimé lorsque le talon cesse d'appuyer. L'appareil comporte également des conduits (46) permettant le passage d'air entre la première (40) et la seconde (44) chambre à air, l'air passant de la seconde chambre (44) à la première chambre (40), alors que la pression augmente cycliquement dans la première chambre (40) de sorte que la partie de paroi (52A) soit poussée contre la jambe lorsque le talon de la personne appuie sur la seconde chambre (44) et l'air passant de la première chambre (40) à la seconde chambre (44) alors que la pression s'exerçant sur la jambe diminue, lorsque le talon de la personne cesse d'appuyer sur la seconde chambre (44).
PCT/US1995/015120 1995-11-20 1995-11-20 Botte autogonflante contre les affections veineuses WO1997018788A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PCT/US1995/015120 WO1997018788A1 (fr) 1995-11-20 1995-11-20 Botte autogonflante contre les affections veineuses
EP95942869A EP0805670A4 (fr) 1995-11-20 1995-11-20 Botte autogonflante contre les affections veineuses
AU44077/96A AU4407796A (en) 1995-11-20 1995-11-20 Self-inflating venous boot

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US1995/015120 WO1997018788A1 (fr) 1995-11-20 1995-11-20 Botte autogonflante contre les affections veineuses

Publications (1)

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WO1997018788A1 true WO1997018788A1 (fr) 1997-05-29

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PCT/US1995/015120 WO1997018788A1 (fr) 1995-11-20 1995-11-20 Botte autogonflante contre les affections veineuses

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EP (1) EP0805670A4 (fr)
AU (1) AU4407796A (fr)
WO (1) WO1997018788A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011018563A1 (fr) 2009-08-14 2011-02-17 David Benjoar Dispositif de massage
EP3117808A1 (fr) * 2015-06-15 2017-01-18 teveno-medi GmbH Dispositif destine a eviter la thrombose dans les veines des jambes
WO2017216624A1 (fr) * 2016-06-15 2017-12-21 Teveno-Medi Gmbh Dispositif pour éviter une thrombose dans les veines des jambes
WO2019032325A1 (fr) 2017-08-07 2019-02-14 Shah Bhavya Ramesh Dispositif, systèmes et procédés de prévention de thrombose veineuse profonde
DE102023102029A1 (de) * 2023-01-27 2024-08-01 Medi Gmbh & Co. Kg Therapeutisches Hilfsmittel für ein Körperteil

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US3403673A (en) * 1965-07-14 1968-10-01 Welton Whann R Means and method for stimulating arterial and venous blood flow
DE2737734A1 (de) * 1977-05-30 1978-12-07 Antonio Dr Vinci Schuh gegen krampfadern
SU852328A1 (ru) * 1979-01-22 1981-08-07 Винницкий Медицинский Институтим. H.И.Пирогова Устройство дл стимулировани ВЕНОзНОгО КРОВООбРАщЕНи НижНиХКОНЕчНОСТЕй
US4372297A (en) * 1980-11-28 1983-02-08 The Kendall Company Compression device
US4941458A (en) * 1984-10-15 1990-07-17 Taheri Syde A Method for aiding cardiocepital venous flow from the foot and leg of an ambulatory patient
US4805601A (en) * 1985-03-15 1989-02-21 Eischen Sr Clement G Device for lower limb extremity having weight-response pressure chambers
US4883462A (en) * 1987-01-30 1989-11-28 Baxter Travenol Laboratories, Inc. Blood extraction assist apparatus and method
US5022387A (en) * 1987-09-08 1991-06-11 The Kendall Company Antiembolism stocking used in combination with an intermittent pneumatic compression device

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011018563A1 (fr) 2009-08-14 2011-02-17 David Benjoar Dispositif de massage
EP3117808A1 (fr) * 2015-06-15 2017-01-18 teveno-medi GmbH Dispositif destine a eviter la thrombose dans les veines des jambes
CN109310530A (zh) * 2015-06-15 2019-02-05 泰维诺-梅迪有限公司 用于避免在腿部静脉中形成血栓的装置
WO2017216624A1 (fr) * 2016-06-15 2017-12-21 Teveno-Medi Gmbh Dispositif pour éviter une thrombose dans les veines des jambes
WO2019032325A1 (fr) 2017-08-07 2019-02-14 Shah Bhavya Ramesh Dispositif, systèmes et procédés de prévention de thrombose veineuse profonde
EP3664764A4 (fr) * 2017-08-07 2021-05-05 Bhavya Ramesh Shah Dispositif, systèmes et procédés de prévention de thrombose veineuse profonde
US11135128B2 (en) 2017-08-07 2021-10-05 Bhavya Ramesh Shah Device, systems, and methods for prevention of deep vein thrombosis
US12064393B2 (en) 2017-08-07 2024-08-20 Bhavya Ramesh Shah Device, systems, and methods for prevention of deep vein thrombosis
DE102023102029A1 (de) * 2023-01-27 2024-08-01 Medi Gmbh & Co. Kg Therapeutisches Hilfsmittel für ein Körperteil

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AU4407796A (en) 1997-06-11
EP0805670A4 (fr) 1999-12-29
EP0805670A1 (fr) 1997-11-12

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