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WO2014159347A1 - Prothèse cheville-pied pour adaptation automatique à des surfaces de marche inclinées - Google Patents

Prothèse cheville-pied pour adaptation automatique à des surfaces de marche inclinées Download PDF

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Publication number
WO2014159347A1
WO2014159347A1 PCT/US2014/023141 US2014023141W WO2014159347A1 WO 2014159347 A1 WO2014159347 A1 WO 2014159347A1 US 2014023141 W US2014023141 W US 2014023141W WO 2014159347 A1 WO2014159347 A1 WO 2014159347A1
Authority
WO
WIPO (PCT)
Prior art keywords
ankle
damper
foot
foot prosthesis
prosthesis
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US2014/023141
Other languages
English (en)
Inventor
Andrew Howard HANSEN
Eric Alexander NICKEL
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Office of General Counsel of VA
Original Assignee
Office of General Counsel of VA
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
Priority claimed from US14/022,645 external-priority patent/US9549827B2/en
Application filed by Office of General Counsel of VA filed Critical Office of General Counsel of VA
Publication of WO2014159347A1 publication Critical patent/WO2014159347A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/50—Prostheses not implantable in the body
    • A61F2/68—Operating or control means
    • 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
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/50—Prostheses not implantable in the body
    • A61F2/60—Artificial legs or feet or parts thereof
    • A61F2/66—Feet; Ankle joints
    • A61F2/6607—Ankle joints
    • 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
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/50—Prostheses not implantable in the body
    • A61F2/68—Operating or control means
    • A61F2/74—Operating or control means fluid, i.e. hydraulic or pneumatic
    • A61F2/748—Valve systems
    • 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
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/50—Prostheses not implantable in the body
    • A61F2002/5003—Prostheses not implantable in the body having damping means, e.g. shock absorbers
    • A61F2002/5006—Dampers, e.g. hydraulic damper
    • 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
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/50—Prostheses not implantable in the body
    • A61F2/76—Means for assembling, fitting or testing prostheses, e.g. for measuring or balancing, e.g. alignment means
    • A61F2002/7615—Measuring means
    • A61F2002/7635—Measuring means for measuring force, pressure or mechanical tension
    • 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
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/50—Prostheses not implantable in the body
    • A61F2/76—Means for assembling, fitting or testing prostheses, e.g. for measuring or balancing, e.g. alignment means
    • A61F2002/7615—Measuring means
    • A61F2002/764—Measuring means for measuring acceleration

Definitions

  • the present invention is generally directed to prosthetic and orthotic devices, and more particularly to an ankle-foot prosthesis for automatic adaptation to level, as well as sloped walking surfaces. Even more particularly, the invention is directed to a device or system for use by lower limb amputees to more easily and safely walk over a variety of sloped terrain, as well as to provide more stability during standing and swaying tasks.
  • Most currently available prosthetic ankle devices are springlike structures that operate about one equilibrium point (i.e., one resting angle). These systems can work nicely on level terrain but cause instabilities when lower limb prosthesis users walk on sloped surfaces.
  • Atty. Docket No. PCT 1628/14 2 sloped surfaces on each and every step of walking.
  • powered ankle- foot systems are being developed (Hugh Herr, Massachusetts Institute of Technology; Thomas Sugar, Arizona State University; Michael Goldfarb, Vanderbilt University). These systems all actively push the prosthesis user with a motor during various times in the gait cycle and require large power sources, e.g., heavy batteries and motors.
  • the only currently available system on the market (iWalk BiOM) is expensive, making it impractical for the majority of lower limb prosthesis users. Also, the high power requirements necessitate carrying additional batteries and frequent charging of batteries.
  • One aspect of the present invention is to provide an ankle- foot prosthesis that allows a user to have a more natural, and thus more comfortable gait.
  • Another aspect of the present invention is to provide an ankle-foot prosthesis that is more energy-efficient when used for walking or other gait.
  • Another aspect of the present invention is provide an ankle- foot prosthesis that resists or prevents undesirable backward swing, which could lead to imbalance or injury.
  • Another aspect of the present invention is to provide an ankle-foot prosthesis that is quieter, light-weight, and less clumsy to use, and thus more user-friendly.
  • Another aspect of the present invention is to provide an ankle-foot prosthesis that automatically adapts to different sloped walking surfaces on every step of walking.
  • Another aspect of the present invention is to provide an ankle-foot prosthesis that can easily switch into a stable mode for standing or swaying, for example, when washing the dishes.
  • an ankle-foot prosthesis which includes a foot plate, an ankle frame attached to the foot plate, a yoke pivotally connected to the ankle frame and including a member for attaching to a leg, a damper having a first end connected to the yoke and a second end connected to the ankle frame, and a control mechanism for switching the damper between low and high settings.
  • an ankle-foot prosthesis which includes a foot plate, an ankle frame attached to the foot plate and including anterior and posterior portions and an apex portion, a yoke pivotally connected to the apex portion of the ankle frame and including a member for attaching to a leg, a hydraulic damper having a first end pivotally connected to the yoke and a second end connected to the posterior portion of the ankle frame; a spring disposed in parallel to the damper, and a control mechanism for controlling extension and compression of the damper.
  • Another aspect of the present invention is to provide a method of using an ankle-foot prosthesis by an amputee, which includes a) providing an ankle-foot prosthesis including i) a foot plate, ii) an ankle frame attached to the foot plate, iii) a yoke pivotally connected to the ankle frame and including a member for attaching to a leg, iv) a damper having a
  • Atty. Docket No. PCT 1628/14 5 first end connected to the yoke and a second end connected to the ankle frame, and v) a control mechanism for switching the damper between low and high settings to selectively control extension, compression, or both extension and compression thereof; b) attaching the ankle-foot prosthesis to a lower limb of the amputee; c) allowing the amputee to ambulate for at least one gait cycle, wherein the gait cycle includes i) the ankle-foot prosthesis in an initial neutral position to a first plantarflexion position such that the foot plate is substantially flat on a walking surface, and ii) the ankle-foot prosthesis in a toe-off plantarflexion position; d) switching the damper to the high extension setting substantially at the first plantarflexion position; and e) switching the damper to the low extension setting substantially at the toe-off plantarflexion position.
  • the present invention is directed to a prosthetic ankle-foot device that can automatically adapt its function for walking on different sloped surfaces, allowing its user to walk on these surfaces with more stability and confidence.
  • the invention also provides a stable mode for standing and swaying tasks (e.g., washing the dishes).
  • Figure 1 is a perspective view of a preferred embodiment of the ankle-foot prosthesis in accordance with the present invention.
  • Figure 2 illustrates a blank timing plot for the ankle-foot prosthesis of the present invention, which can be used to create any gait cycle that begins with prosthetic heel contact (HC) and continues until the next HC (100% of the gait cycle);
  • Figure 3 illustrates a plot of the theoretical vertical load on the prosthesis
  • Figure 4 illustrates a plot of the load on spring/damper combination at the start of stance phase, the heel of the prosthesis making contact with the surface, placing a compressive load on the spring/damper combination
  • Figure 5 illustrates a plot of the damping values in each direction for the damper during the gait cycle
  • Figure 6 illustrates a plot of the cylinder (damper) length
  • Figure 7 shows three hydraulic circuit symbols used for fluid circuit schematics shown in Figures 8-16;
  • FIGs 8-16 disclose various preferred embodiments of the fluid control circuit (FCC) used in the present invention.
  • FIG. 1 a preferred embodiment of the ankle- foot prosthesis AFP will be described.
  • a generally pyramid-like attachment part 10 consistent with standard endoskeletal componentry in prosthetics, is provided at the top of a yoke 12, on the opposite ends of which are holes drilled for front and rear pivotal attachments 14 and 16, respectively.
  • the rear pivot 16 attaches to one end 17 of a preferably microprocessor controlled damper device 18 (to be described in more detail below).
  • a neutralizing spring 20 is connected in parallel to the damper 18, such that its length change is equal to that of the damper.
  • the damper device 18 attaches on its other end 19 to an ankle frame 22, which has a yoke opening 24 and holes drilled at its posterior end 26 to pivotally attach to the damper 18 using a shaft 28.
  • the "ankle" of the device AFP is a shaft 30 connecting the yoke 12 with the apex 29 of the ankle frame 22.
  • the ankle frame 22 attaches with one or more bolts (or other suitable fixation means) to the rear portion 32 of a flexible, yet deflectable rigid foot plate 34.
  • the anterior end 36 of the ankle frame 22 includes a follower or upwardly inclined surface 38 that limits the deflection of the foot plate 34, such that the ankle-foot device AFP will take a biomimetic ankle- foot roll-over shape during walking.
  • the geometry of the surface 38 is such that it provides the correct roll-over shape when the "ankle" is locked into a plantarflexed angle at the time of foot flat of walking, i.e., an angle of about 10 to 15 degrees.
  • the damper 18 is designed to have different values for compression and extension damping that can be controlled by using a suitable microprocessor (not shown). Specifically, the microprocessor would have the capability to variably manage the timing for opening and closing the valves and the variable restriction element, shown in Figure 7 and described below in more detail.
  • the compression damping is set to a very low level and is unchanged throughout the gait cycle.
  • the extension damping for walking is set to a very high level at the beginning of the gait cycle and changes to a very low level damping at the time of toe-off (which must be sensed using one or more sensors of force, acceleration, or other properties).
  • the extension damping can remain at a low level of damping for at least the time needed to return the ankle to a neutral or dorsiflexed position for swing phase and at most the time to the next foot
  • the ankle After foot flat, the ankle is at a maximally plantarflexed position and would normally start to dorsiflex. In this invention, the extension damping would be very high, essentially locking the ankle in a plantarflexed position.
  • the flexible footplate 34 flexes up to the follower 38, producing a biomimetic ankle-foot roll-over shape. After the opposite foot contacts the ground, energy is returned from the flexible footplate 34 and the ankle goes into late stance plantarflexion (the angle at which it was set to at foot flat).
  • the extension damping switches a very low level, allowing the neutralizing spring 20 to bring the ankle back to a neutral or slightly dorsiflexed position, which allows for toe clearance during the swing phase.
  • the damping level needs to be low enough to allow the ankle to return to neutral during the first third or half of the swing phase.
  • Atty. Docket No. PCT 1628/14 10 returned to neutral or a slightly dorsiflexed position and before the prosthesis gets to foot flat on the next cycle, the extension damping should shift to a very high level for the next cycle.
  • the operation of the ankle in the manner described above allows the foot to "find the surface" during walking. For uphill walking, the foot finds the surface in a more dorsiflexed position compared with that for level walking and thus the equilibrium point of the ankle is set in more dorsiflexion. For downhill walking, the foot finds the surface in a more plantarflexed position compared with that for level walking. In this way, the ankle-foot device automatically adapts to different terrain on each and every step of walking.
  • the control mechanism for the ankle would be relatively simple in that it only changes the extension damping of the damper 18 between two levels during walking.
  • the control mechanism also needs to determine when the ankle-foot system is in "walking" and “standing” modes and switch its behavior. For "standing” mode, the damping for both compression and extension of the damper 18 should be set to very high, as mentioned earlier. [0032] Referring to Figures 2-6, various timing plots for the ankle- foot prosthesis AFP of the invention will now be described.
  • the blank plot of Figure 2 can be used to create any gait cycle that begins with prosthetic heel contact (HC) and continues until the next HC (100% of the gait cycle).
  • both feet are on the ground as weight transitions from the opposite limb to the prosthetic limb.
  • the opposite toe is lifted from the floor (opposite toe-off or OTO).
  • OTO opposite toe-off
  • the opposite toe is off the ground, only the prosthetic foot is in contact with the walking surface and supporting the weight of the body, so this is considered prosthetic single-limb-support (40% of the gait cycle). This also corresponds to the period of highest load on the prosthetic limb as the user rolls over their foot.
  • the opposite heel contacts the surface (OHC) and weight begins to transition from the prosthetic limb to the sound limb.
  • FIG. 3 illustrates a plot of the theoretical vertical load on the prosthesis.
  • the plot shows the standard double-hump shape of the vertical component of the ground reaction force vector from standard gait analyses.
  • the first peak corresponds to load acceptance on the prosthetic side
  • Atty. Docket No. PCT 1628/14 12 where the prosthesis is used to brake the descent of the body center of mass.
  • the second peak occurs as the user pushes off of their prosthetic side and begins to transition onto their sound side (and occurs around opposite heel contact (OHC).
  • the vertical load drops to 0 as the toe leaves the surface (toe-off, TO) and remains there through swing phase.
  • the vertical load can reach levels that are greater than body weight.
  • the peak load could be 1 .1 xBW (Body Weight)
  • the peak load could be upwards of 1 .5xBW (Body Weight).
  • Figure 4 illustrates a plot of the load on the spring/damper combination at the start of stance phase, the heel of the prosthesis making contact with the surface, placing a compressive load on the spring/damper combination. This load continues until the foot is resting flat against the walking surface. At that time, the user begins to roll over their prosthetic foot.
  • the damper is set to a high extension damping level, so it does not extend, thus the spring becomes an internal stress and when the user starts to roll over their foot, the compressive load very rapidly switches to a small tensile load and then the tensile load gradually increases as the user rolls over the foot.
  • the user Near the end of stance phase, the user has rolled over the prosthesis and begins to lift the foot from the ground, reducing the tensile force on the spring-damper combination, until the toe is lifted from the surface. At this point the spring is still applying an internal force within the system but is unable to actuate motion because the damper is still in a
  • Atty. Docket No. PCT 1628/14 13 high extension damping state and resists the spring.
  • the hydraulic cutoff valve (fluid equivalent of a switch) is opened allowing the spring to extend and quickly return the foot to a neutral ankle position for swing phase.
  • Figure 5 illustrates a plot of the damping values in each direction for the damper during the gait cycle.
  • the damping during walking should be low enough to allow the foot to quickly reach the surface, but not so low that the foot makes a slapping sound when it encounters the surface.
  • the precise value will be dependent on the weight, foot length, and gait mechanics of each individual user and will parallel standard clinical practice for adjusting similar properties of other commercially available components.
  • the precise amount of damping will be adjustable by the prosthetist for customization to the individual.
  • an ideal embodiment would also be able to raise the compression damping to near infinite (through the use of a cutoff valve) to improve stability when loading the heel, however this function is not of use during walking tasks.
  • the extension damping must be high or nearly infinite (closed cutoff valve, effectively fixing the length of the damper against extension) when the user begins to roll over the foot (in the plot, this is shown as approximately 5% of the gait cycle) and must remain so until the point of toe-off.
  • the cutoff must be high or nearly infinite (closed cutoff valve, effectively fixing the length of the damper against extension) when the user begins to roll over the foot (in the plot, this is shown as approximately 5% of the gait cycle) and must remain so until the point of toe-off.
  • Atty. Docket No. PCT 1628/14 14 valve is opened, allowing the damper to extend under the load from the spring until the prosthesis has returned to a neutral position (ideally within 0.13 seconds). After the foot has returned to a neutral position for swing phase, the cutoff valve can be closed again. Thus, the cutoff valve could close as early as 0.13 seconds after toe-off or as late as at the moment of foot flat (approximated as 5% of the next gait cycle, but varies by step and surface conditions).
  • Figure 6 illustrates a plot of the cylinder (damper) length.
  • the current model of the novel ankle-foot prosthesis has a damper with a fully extended length of 70 mm, and a fully compressed length of 50 mm. This corresponds to a 30-35 degree range of ankle motion. Other designs may use different numbers, however the relationships will still hold.
  • the ankle When walking on level ground, the ankle will plantarflex, allowing the foot plate to become flat on the walking surface, during the first approximately 5-10% of the gait cycle. Once the foot is flat on the surface and the user begins to roll over the foot, the damper is unable to extend, so the spring-damper combination remains at its partially extended length throughout the remainder of stance phase.
  • the cutoff valve When the prosthesis is lifted from the ground (TO), the cutoff valve is opened and the spring returns the foot to a neutral position for swing phase.
  • the foot When walking uphill, the foot will be flat on the surface in a more dorsiflexed position, so the foot will not plantarflex much
  • Figure 7 shows three hydraulic circuit symbols used for fluid circuit schematics shown in Figures 8-16.
  • the symbol used for the check valve 40 is most commonly used to refer to a ball valve, although other types of check valves may also be used.
  • the variable restriction 42 is the damping element of the circuit. There is some damping (fluid resistance) due to friction in the lines and passing through other elements of the circuit, so there is a minimum level of damping regardless. Thus, in some embodiments, the restriction element is not present indicating the use of innate damping alone.
  • the reference numeral 44 designates a cutoff value.
  • Figure 8 discloses the most complex and powerful embodiment of the fluid control circuit (FCC). The fluid circuit splits into two branches.
  • FCC fluid control circuit
  • Each branch has a check valve 40 oriented to permit fluid flow in either compression or extension alone, thereby separating the extension and compression properties for the damper.
  • a variable restriction element 42 where the prosthetist could adjust the damping level to optimize the prosthesis for the individual patient.
  • the extension line there is also a variable restriction element 42 that could be adjusted to tune the neutralization damping after toe-off to
  • Atty. Docket No. PCT 1628/14 16 address any issues with the speed of neutralization or with noises that could arise from underdamped neutralization. Both lines have independent cutoff valves 44, allowing the extension damping to be raised to nearly infinite as appropriate during each step and then both cutoff valves to be closed for standing tasks, making a stable base of support for the user.
  • Figure 9 discloses an embodiment that contains all of the adjustability of the embodiment of Figure 8, but only a single cutoff valve 44 is used on a common line to arrest both compression and extension of the damper simultaneously.
  • the advantage of this system over Figure 8 is fewer parts (one fewer cutoff valve).
  • the disadvantage of this system compared with the embodiment of Figure 8 is that sensors would need to be in place to insure that the cutoff valve would open at the time of toe-off and close at exactly the time of foot flat to prevent unexpected instability and potential falls.
  • Figure 10 discloses an embodiment that is similar to the embodiment of Figure 8, except it does not have a variable restriction element 42 on the extension line. Therefore, there is no way to tune the extension damping for neutralization after toe-off.
  • This embodiment is more efficient because of the reduced number of components (saving weight, size and cost) but only if the fluid circuit can be optimized to allow the foot to return to neutral within 0.13 seconds without oscillating or
  • Figure 1 1 discloses an embodiment similar to the embodiments presented in both Figures 9-10, however, it lacks the ability to adjust extension damping and has a single cutoff valve 44 to arrest motion in both extension and compression simultaneously. This is even more efficient, having removed two components from the system and saving weight, size, and cost. The challenges with this embodiment have been discussed in paragraphs [0039] and [0040].
  • FIG. 12 The embodiment of Figure 12 is similar to the embodiment of Figure 8, except that it does not have a cutoff valve 44 in the compression line. For this reason, the compression damping will remain constant throughout the gait cycle and compression motion will not be arrested during standing tasks. Both lines have adjustable damping from the variable restriction elements and the extension line still has a cutoff valve.
  • This embodiment could be realized in a purely passive system, where the biomechanics of walking (e.g. load on the prosthesis) control the opening and closing of the cutoff valve.
  • a spring-loaded hinge or telescoping element within the prosthesis could close the cutoff valve when load is applied to the prosthesis and open the cutoff valve when load is
  • FIG. 13 The embodiment of Figure 13 is similar to the embodiments of Figures 10 and 12, however, it also lacks the ability to adjust the damping in the extension line but saves weight, size, and cost. But it lacks the ability to cutoff the compression line and therefore does not have the standing stability feature of the earlier embodiments.
  • FIG. 14 The embodiment of Figure 14 is similar to the embodiment of Figure 8, but lacks variable dampers 42.
  • the level of resistance for compression can be adjusted by the prosthetist by changing springs or by pre-compressing the spring. Otherwise the function would be the same.
  • FIG. 15 The embodiment of Figure 15 is similar to the embodiment of Figure 9, but lacks variable dampers 42.
  • the level of resistance for compression can be adjusted by the prosthetist by changing springs or by pre-compressing the spring.
  • Figure 16 shows our simplest embodiment. There is a check valve 40 to permit compression, but not extension, and then when the foot is to be neutralized the cutoff valve is opened, permitting extension by
  • Nickel EA Hansen AH, Gard SA. (2012) Prosthetic Ankle- Foot System that Adapts to Sloped Surfaces. ASME Journal of Medical Devices, Vol. 6, No. 1 , 01 1006.

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  • Health & Medical Sciences (AREA)
  • Transplantation (AREA)
  • Biomedical Technology (AREA)
  • Cardiology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Engineering & Computer Science (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Prostheses (AREA)

Abstract

La présente invention concerne une prothèse cheville-pied qui comprend une plaque de pied, un cadre de cheville fixé à la plaque de pied, un étrier raccordé de façon pivotante au cadre de cheville et comprenant un composant pour fixation à une jambe, un amortisseur ayant une première extrémité raccordée à l'étrier et une deuxième extrémité raccordée au cadre de cheville, et un mécanisme de commande pour commuter l'amortisseur entre des réglages bas et haut.
PCT/US2014/023141 2013-03-13 2014-03-11 Prothèse cheville-pied pour adaptation automatique à des surfaces de marche inclinées Ceased WO2014159347A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US201361851740P 2013-03-13 2013-03-13
US61/851,740 2013-03-13
US14/022,645 2013-09-10
US14/022,645 US9549827B2 (en) 2009-04-13 2013-09-10 Ankle-foot prosthesis for automatic adaptation to sloped walking surfaces

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WO2014159347A1 true WO2014159347A1 (fr) 2014-10-02

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110430841A (zh) * 2017-03-17 2019-11-08 Pm工程设计公司 一种包括缓冲元件的足假肢
CN110588831A (zh) * 2019-09-27 2019-12-20 哈尔滨理工大学 一种机器人足端减震机构
CN110786971A (zh) * 2015-05-18 2020-02-14 因文图斯工程有限公司 假体部件或外骨骼部件以及操作它们的方法

Citations (4)

* Cited by examiner, † Cited by third party
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US20060241782A1 (en) * 2005-04-21 2006-10-26 Curtis Michael J Vertical shock absorbing prosthetic foot
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