US20130219745A1 - Walking Device - Google Patents
Walking Device Download PDFInfo
- Publication number
- US20130219745A1 US20130219745A1 US13/489,332 US201213489332A US2013219745A1 US 20130219745 A1 US20130219745 A1 US 20130219745A1 US 201213489332 A US201213489332 A US 201213489332A US 2013219745 A1 US2013219745 A1 US 2013219745A1
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- United States
- Prior art keywords
- hydraulic
- hydraulic chambers
- insole
- user
- orthotic device
- 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.)
- Abandoned
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Images
Classifications
-
- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B3/00—Footwear characterised by the shape or the use
-
- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B13/00—Soles; Sole-and-heel integral units
- A43B13/38—Built-in insoles joined to uppers during the manufacturing process, e.g. structural insoles; Insoles glued to shoes during the manufacturing process
- A43B13/386—Built-in insoles joined to uppers during the manufacturing process, e.g. structural insoles; Insoles glued to shoes during the manufacturing process multilayered
-
- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B3/00—Footwear characterised by the shape or the use
- A43B3/34—Footwear characterised by the shape or the use with electrical or electronic arrangements
- A43B3/38—Footwear characterised by the shape or the use with electrical or electronic arrangements with power sources
-
- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B7/00—Footwear with health or hygienic arrangements
- A43B7/14—Footwear with health or hygienic arrangements with foot-supporting parts
- A43B7/1405—Footwear with health or hygienic arrangements with foot-supporting parts with pads or holes on one or more locations, or having an anatomical or curved form
- A43B7/1415—Footwear with health or hygienic arrangements with foot-supporting parts with pads or holes on one or more locations, or having an anatomical or curved form characterised by the location under the foot
- A43B7/142—Footwear with health or hygienic arrangements with foot-supporting parts with pads or holes on one or more locations, or having an anatomical or curved form characterised by the location under the foot situated under the medial arch, i.e. under the navicular or cuneiform bones
-
- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B7/00—Footwear with health or hygienic arrangements
- A43B7/14—Footwear with health or hygienic arrangements with foot-supporting parts
- A43B7/1405—Footwear with health or hygienic arrangements with foot-supporting parts with pads or holes on one or more locations, or having an anatomical or curved form
- A43B7/1415—Footwear with health or hygienic arrangements with foot-supporting parts with pads or holes on one or more locations, or having an anatomical or curved form characterised by the location under the foot
- A43B7/144—Footwear with health or hygienic arrangements with foot-supporting parts with pads or holes on one or more locations, or having an anatomical or curved form characterised by the location under the foot situated under the heel, i.e. the calcaneus bone
-
- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B7/00—Footwear with health or hygienic arrangements
- A43B7/14—Footwear with health or hygienic arrangements with foot-supporting parts
- A43B7/1405—Footwear with health or hygienic arrangements with foot-supporting parts with pads or holes on one or more locations, or having an anatomical or curved form
- A43B7/1455—Footwear with health or hygienic arrangements with foot-supporting parts with pads or holes on one or more locations, or having an anatomical or curved form with special properties
-
- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B7/00—Footwear with health or hygienic arrangements
- A43B7/14—Footwear with health or hygienic arrangements with foot-supporting parts
- A43B7/1405—Footwear with health or hygienic arrangements with foot-supporting parts with pads or holes on one or more locations, or having an anatomical or curved form
- A43B7/1455—Footwear with health or hygienic arrangements with foot-supporting parts with pads or holes on one or more locations, or having an anatomical or curved form with special properties
- A43B7/1464—Footwear with health or hygienic arrangements with foot-supporting parts with pads or holes on one or more locations, or having an anatomical or curved form with special properties with adjustable pads to allow custom fit
-
- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B7/00—Footwear with health or hygienic arrangements
- A43B7/14—Footwear with health or hygienic arrangements with foot-supporting parts
- A43B7/28—Adapting the inner sole or the side of the upper of the shoe to the sole of the foot
Definitions
- the present invention is in the technical field of footwear. More particularly, the present invention is in the technical field of active prosthetic device.
- pedorthics which combine an arch support and medial heel posting (a wedge on the inside of the heel) are commonly used to realign the flat foot into a more neutral position and thus improve gait mechanics. These pedorthics have been shown to improve gait mechanics by supporting the longitudinal arch while reducing plantar and medial soft tissue strain.
- the present invention is an active orthotic device to aid a user's natural foot function.
- an active orthotic adjusts the height of the arch and the tilt of the hind foot depending on the phase of the gait cycle. Such an orthotic allows the foot to be supple at heel strike and to be rigid at toe-off, and thus more closely reproduces natural foot function.
- an active orthotic device comprises a first insole, a second insole and a plurality of hydraulic chambers disposed between the first insole and the second insole.
- the hydraulic chambers are configured to hold liquid within an interior of the chamber.
- the first insole is arranged and configured to bias the plurality of hydraulic chambers in a downward direction.
- a plurality of tube fittings are provided, where each tube fitting coupled to the plurality of hydraulic chambers.
- active orthotic device further comprises a plantar pressure sensor disposed on a surface of the first insole and a microprocessor coupled to the plantar pressure sensor.
- the microprocessor is configured for receiving signals from the plantar pressure sensor and controlling the amount of liquid in the plurality of hydraulic chambers.
- active orthotic device also has a plurality of hydraulic actuators coupled to the microprocessor and to one of the plurality of hydraulic chambers through one of the plurality of tube fittings.
- the plurality of hydraulic actuators further has a geared electric motor and a piston, where the piston is configured to add liquid to and remove liquid from the interior of the hydraulic chamber.
- the geared electric motor is configured to position the piston in response to signals from the microprocessor.
- a device compartment is also provided for storing the microprocessor and the plurality of hydraulic actuators.
- an active orthotic device for correcting a user's arch support is provided, where the active orthotic device has a first insole, a second insole, and a plurality of hydraulic chambers disposed between the first insole and the second insole configured to hold liquid within an interior of the chamber.
- the first insole is positioned relative the plurality of hydraulic chambers to bias the plurality of hydraulic chambers in a downward direction.
- the orthotic device also has a plantar pressure sensor disposed on a surface of the first insole configured for detecting the pressure from the arch of a user's foot and a plurality of hydraulic actuators, each coupled to one of the plurality of hydraulic chambers.
- the plurality of hydraulic actuators are configured to control the amount of liquid in the plurality of hydraulic chambers.
- the active orthotic device has a microprocessor coupled to the plantar pressure sensor and the plurality of hydraulic actuator configured for receiving one or more signals from the plantar pressure sensor, and, in response to the one or more signals, controlling movement of the plurality of hydraulic actuators to regulate the quantity of liquid in the plurality of hydraulic chambers.
- the system measures the plantar pressure distribution from a user's foot, determines the stepping frequency of the user, and reads statistical information regarding the user's previous steps and, in response, provides an optimized arch support by triggering one or more of the plurality of hydraulic actuators to add or remove liquid from one or more of the plurality of hydraulic chambers in a medial section of the active orthotic device, resulting in raising or lowering of the plurality of hydraulic chambers of the active orthotic device in the medial section.
- the system detects the position of the user in the walking cycle, detects the heel angle and detects the stepping frequency of the user and, in response, provides an optimized heel tilt by triggering one or more of the plurality of hydraulic actuators to add or remove liquid from one or more of the plurality of hydraulic chambers in a heel section of the active orthotic device, resulting in raising or lowering of the plurality of hydraulic chambers of the active orthotic device in the heel section of the active orthotic device.
- FIG. 1 is an isometric view of an Active Prosthetic Shoe Device (APSD) according to one embodiment of the present invention showing a device that the user would use on his/her right foot.
- APSD Active Prosthetic Shoe Device
- FIG. 2 is a side view of the APSD according to one embodiment of the present invention showing the hydraulic chambers (rubber bellows) that separate the bottom and top insole layers.
- FIG. 3 is a top view of one embodiment of an APSD; showing the rigid layer to distribute the pressure points from the hydraulic chambers.
- FIG. 4 is a bottom view of an AASI according to one embodiment of the present invention showing the layout of the of hydraulic chambers (rubber bellows) in the sole of the shoe of the present invention; and it outlines the path of the fluid lines that lead to the 90 degree tube fittings.
- FIG. 5 is a view of the comfort insole that serves to house the hydraulic chambers while they are not inflated.
- FIG. 6 shows a condensed hardware outline of the entire system.
- FIG. 7 illustrates an isometric view of hydraulic actuator.
- FIG. 8 illustrates a compartment that houses all the hardware used in the APSD system.
- FIG. 9 top and bottom view of a compartment according to one embodiment of the present invention.
- FIG. 10 is a front view of a compartment showing the side view of the hydraulic actuators.
- FIG. 11 illustrates a rear isometric view of a compartment according to one embodiment of the present invention showing all the components.
- FIG. 12 illustrates a human walking gait cycle
- FIG. 13 shows a flow diagram that illustrates the operation of the active arch mechanism.
- FIG. 14 shows a flow diagram that illustrates the operation of the heel tilt mechanism.
- FIG. 15 shows a flow diagram that illustrates the hardening of the bottom insole to increase walking efficiency.
- FIGS. 1-5 illustrate one embodiment of an Active Prosthetic Shoe Device (APSD) 10 in accordance with one aspect of the present invention.
- the illustrated embodiment is comprised of three primary active functions.
- the medial section of the APSD is comprised of a matrix of hydraulic chambers 13 .
- the chambers are typically made of circular channels of a flexible and durable plastic (rubber bellows) that trap fluid and expand depending on the volume of the fluid content found inside.
- hydraulic chambers are located in the medial section of the device to actively modify the arch support of a shoe.
- three hydraulic chambers are located at the heel to actively tilt the heel to the desired angle.
- a system is located in the frontal region 30 that makes the plantar side of the device harden at the point before push-off to create a rigid lever and assure an increased transfer of energy.
- the insole 12 is held horizontal above the bottom insole 15 at the point where the foot will contact the device.
- the two insoles 12 and 15 are held in the stacked arrangement shown in FIGS. 1 and 2 .
- Insole 12 also serves to push or bias hydraulic cylinders 13 in a downward direction.
- the APSD 10 dimensions could be modified to suit users of several shoe sizes.
- the outer edges on the exterior side of the APSD are sown 19 to help align both insoles.
- On the top of the insole 12 a support insole 11 is located that helps distribute the point forces from the hydraulic chambers and the hydraulic chambers that tilt the heel.
- comfort insole 14 is sandwiched between insole 12 and insole 15 and serves as a housing for the hydraulic chambers.
- the cylinders are typically housed at cut-outs 19 and 20 when the hydraulic chambers are empty. In operation, the chambers are inflated by directing fluid through the tube fittings 16 and passing through the channels 17 found in the bottom insole 15 .
- APSD 10 is shown coupled to a schematic of the hardware involved in the system.
- the system is typically comprised of a plantar pressure sensor 21 that captures the dynamic in-shoe pressure distribution, which allows determination of accurate pressure patterns during gait and determination of the user's activity or stepping frequency.
- This sensor 21 is linked to the microprocessor 28 , which in turn directs the motor driver 32 to power the geared electric motor 23 using pulse width modulation at high frequencies to allow for precise proportional control.
- the geared electric motor 23 turns the output gear 35 having an internal thread 25 that matches the thread of the threaded rod 25 .
- each hydraulic actuator 22 is held together by an aluminum bracket 36 .
- the bracket also serves to mount each hydraulic actuator 22 to portable compartment 31 illustrated and described with respect to FIGS. 8-11 .
- the quantity of liquid in each hydraulic chamber 13 is typically determined by the position of the piston 26 along the hydraulic actuator 22 , and the position of the piston 26 is determined by an encoder 24 located at the end of the motor responsible for reading the motors turns. Liquid is dispensed to the fittings 16 coupled to the hydraulic chambers 13 through the exhaust 37 of the hydraulic actuator 22 .
- the amount of liquid in each hydraulic chamber 13 creates the correct arch form to help the user's foot function properly and complete a close-loop control system with the reaction forces produced on the plantar pressure sensor 21 by the user's foot.
- the system is powered by a portable battery 29 .
- each hydraulic chamber 13 is actuated by its own hydraulic actuator.
- the electronic components in the system such as the pressure sensors 21 , communicate and are powered through data lines 27 that couple the sensor 21 to the microprocessor 28 .
- FIGS. 8-11 illustrate a compartment 31 that houses components and is configured to be worn around the back.
- the proposed system works by tracking the stepping frequency and the position of the foot in a walking cycle by using a plantar pressure sensor 27 array.
- the system of the illustrated embodiment is typically comprised of three functions: modifying arch support, tilting the heel and providing a rigid lever at push-of, each function depending upon the variables associated with a person's gait cycle.
- a typical human's walking gait cycle is illustrated in FIG. 12 .
- the system of the illustrated embodiment aids the foot by absorbing impact and stabilizing the foot as it makes contact with the ground.
- the system is configured to zero the hydraulic actuators 46 and run, and then proceed to measure plantar pressure distribution 47 , determine stepping frequency 48 , read user preferences 49 , and access statistical information of the user's previous steps 50 .
- the system provides the user with an optimized arch 51 support in the loading response section 41 of the gait cycle, as illustrated in FIG. 12 . If the arch support needs correction 53 , the hydraulic actuators 13 are either raised 54 or lowered 55 . If the system does not require correction, the system typically enters sleep mode 57 and the timer loop 56 is reset.
- an optimized arch and heel support should be created for both feet.
- the left foot should be ready to absorb ground reaction forces and prepare the arch support design, and the right foot should be starting to form a rigid lever to help the user push-off the ground.
- the system should be helping the user support its left foot and help propel its right foot by hardening the bottom of the insole at the proper location, with the proper force and timing (duration).
- swing 45 the user should have its left foot supported by the APSD 10 , system and three mechanisms described above should be relaxed on the right foot, saving energy, and preparing to contact the ground and repeat the cycle.
- the system that controls the heel tilt illustrated in FIG. 14 functions by detecting the position of the user in the walking cycle 58 , detects the heel angle 59 , and finally detects the user's speed (steeping frequency) 60 .
- the system then processes the inputs 61 , detects the location of the hydraulic actuators 62 , and applies the adequate correction to the heel tilt 63 .
- the system adjusts the height of the hydraulic chambers 13 by actively filling and emptying the hydraulic chambers 13 in the medial section of the APSD 10 to reproduce an effective arch design that best helps the foot perform its natural function in that walking cycle.
- the system that creates the rigid lever in order to increase walking efficiency in flatfoot found in FIG. 15 , will be described.
- the system initiates and begins by collecting data on past user statistics 64 (where the user typically bends the shoe before push-off, how much force the user applies in that area, and other relevant information).
- the system detects the stepping frequency of the user 65 and read the user's past settings 66 . Once this operation is accomplished, the system detects the user's position in the walking cycle 67 and calculates the following: force to apply 68 , position to apply force 69 , and time to apply force 70 .
- One these parameters have been calculated and verified, the system actuates the bottom of the insole 71 .
- the system may be set to change its arch support under a certain condition that a certain percent change in pressure distribution in the medial section of the APSD 10 occurs. Such a change could be caused by the user changing his/her walking speed or taking part in another activity. By using this mode, the system may greatly decrease its power consumption.
- the mechanism that varies the tilt of the heel is typically active during each cycle as well as the mechanism that hardens the insole before push-off 30 .
- the three hydraulic chambers 13 located in the heel changes their height, and therefore results in that section of the heel to tilt inward or outward (varus or valgus) at a specific point in the walking cycle.
- the arch design and heel tilt angles depend on the activity, stepping frequency, pressure feedback collected by system (the plantar pressure sensor 27 ), and statistical values collected from previous walking cycles.
- the system computes the best arch form, heel tilt, and rigidity factor at push-off to aid an individual reproduce a healthy and optimized foot function.
- the function of each mechanism is outlined in the flow diagram in FIG. 13 .
- an optimized pressure distribution model may be developed and calibrated from experimental results to suit each user.
- a large data set is collected from a series of controlled multistep experiments. The results are used to form a conservative arch design that best stabilizes the foot.
- the computer model is verified by examining the trial-to-trial repeatability and continues to adapt over time to suit the individual needs of that particular person.
- a feedback controller efficiently manages the arch support of the shoe depending on an optimized mathematical model that determines the form of the arch for a certain stepping frequency and activity.
- top insole layer 12 may be made of leather or any other material that is flexible, has a high friction coefficient, and withstands wear, such as, for example, a neoprene plastic or foam covered with textile.
- Layer 11 is typically made of a material that is more rigid then layer 12 , so as to make sure that the forces exerted upward by the hydraulic chambers 13 are better distributed onto the foot.
- Hydraulic chambers 13 are typically made of a material such as rubber or silicon that expands and can handle multiple cycles of use without cracking or leaking.
- the outer wall of the hydraulic chambers 13 is typically reinforced with a textile sleeve to limit hydraulic chamber's 13 lateral expansion.
- Layer 14 provides a space for the fluid chambers to settle when they are not fully inflated. Layer 14 also serves as a way to bias initial expansion. Layer 14 may be manufactured of a material that is comfortable, such as a gel or silicone. Bottom layer 15 may be casted into a mold that maintains its outer counter and traps the fluid chambers (rubber bellows), fluid lines and tube fittings. This material should be flexible once casted so as to allow for it to flex under use. The interconnections between the fluid chambers, fluid lines, and fluid fittings shall not leak.
- the hydraulic actuator is made of 2024 aluminum and uses a double lip o-ring seal.
- the output gears 34 are typically made out of brass, but any suitable material may be used without departing from the intended scope and spirit of the present invention.
- a novel perdorthic device is described that is versatile and adaptive, more so then current static in-shoe orthopedic devices.
- the present invention illustrated and described with respect to FIGS. 1-15 is an active orthotic that principles may be applied to office chairs or beds.
- an array of hydraulic chambers 13 would line the seat and backrest of an office chair.
- the chair itself would compute the pressure distribution being exerted on the chair by the user and would adjust the pressure in each chamber to both modify the user's poster and to equalize the pressure distribution to a predetermined optimized model.
- hydraulic chambers 13 line the top of a bed, then the system could measure the reaction forces of the person lying on the bed using a pressure sensor array and modify the shape of the hydraulic chambers 13 to best accommodate the shape of the person, ultimately better distributing contact pressure and reducing peak pressure points.
- the hydraulic chambers 13 may be inflated with air.
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- Microelectronics & Electronic Packaging (AREA)
- Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
Abstract
An orthotic device that includes an active mechanism to modify the curvature of the arch support and a mechanism to tilt the heel while performing varied activities is provided. The system functions by using both a plantar pressure sensor to measure the reaction forces felt on the device by the foot and determine the position in the walking cycle. A fluid sensor is typically used to determine the pressure in each hydraulic chamber to determine if the pressure in each chamber corresponds with the distribution pattern in the plantar pressure sensor. This device hardens the insole at the point before push-off to create a rigid lever that increases the user's transfer of energy to the ground.
Description
- The present invention is in the technical field of footwear. More particularly, the present invention is in the technical field of active prosthetic device.
- Conventional in-shoe orthoses, (pedorthics) which combine an arch support and medial heel posting (a wedge on the inside of the heel) are commonly used to realign the flat foot into a more neutral position and thus improve gait mechanics. These pedorthics have been shown to improve gait mechanics by supporting the longitudinal arch while reducing plantar and medial soft tissue strain.
- Currently available orthotics improve gait biomechanics in flatfoot by passively raising the arch and tilting the hind foot back to neutral. Unfortunately, this static realignment does not mimic the natural function of the foot. In such a fixed position, the foot is too rigid at heel strike and too flexible at toe-off.
- The present invention is an active orthotic device to aid a user's natural foot function. In one embodiment, an active orthotic adjusts the height of the arch and the tilt of the hind foot depending on the phase of the gait cycle. Such an orthotic allows the foot to be supple at heel strike and to be rigid at toe-off, and thus more closely reproduces natural foot function.
- In accordance with one aspect of the present invention, an active orthotic device comprises a first insole, a second insole and a plurality of hydraulic chambers disposed between the first insole and the second insole. The hydraulic chambers are configured to hold liquid within an interior of the chamber. The first insole is arranged and configured to bias the plurality of hydraulic chambers in a downward direction. A plurality of tube fittings are provided, where each tube fitting coupled to the plurality of hydraulic chambers.
- Then active orthotic device further comprises a plantar pressure sensor disposed on a surface of the first insole and a microprocessor coupled to the plantar pressure sensor. The microprocessor is configured for receiving signals from the plantar pressure sensor and controlling the amount of liquid in the plurality of hydraulic chambers.
- Then active orthotic device also has a plurality of hydraulic actuators coupled to the microprocessor and to one of the plurality of hydraulic chambers through one of the plurality of tube fittings. The plurality of hydraulic actuators further has a geared electric motor and a piston, where the piston is configured to add liquid to and remove liquid from the interior of the hydraulic chamber. In addition, the geared electric motor is configured to position the piston in response to signals from the microprocessor. A device compartment is also provided for storing the microprocessor and the plurality of hydraulic actuators.
- In accordance with another aspect of the present invention, a method of correcting a user's arch support using an active orthotic device is provided. First, an active orthotic device for correcting a user's arch support is provided, where the active orthotic device has a first insole, a second insole, and a plurality of hydraulic chambers disposed between the first insole and the second insole configured to hold liquid within an interior of the chamber. The first insole is positioned relative the plurality of hydraulic chambers to bias the plurality of hydraulic chambers in a downward direction. The orthotic device also has a plantar pressure sensor disposed on a surface of the first insole configured for detecting the pressure from the arch of a user's foot and a plurality of hydraulic actuators, each coupled to one of the plurality of hydraulic chambers. The plurality of hydraulic actuators are configured to control the amount of liquid in the plurality of hydraulic chambers. Finally, the active orthotic device has a microprocessor coupled to the plantar pressure sensor and the plurality of hydraulic actuator configured for receiving one or more signals from the plantar pressure sensor, and, in response to the one or more signals, controlling movement of the plurality of hydraulic actuators to regulate the quantity of liquid in the plurality of hydraulic chambers.
- Then, the system measures the plantar pressure distribution from a user's foot, determines the stepping frequency of the user, and reads statistical information regarding the user's previous steps and, in response, provides an optimized arch support by triggering one or more of the plurality of hydraulic actuators to add or remove liquid from one or more of the plurality of hydraulic chambers in a medial section of the active orthotic device, resulting in raising or lowering of the plurality of hydraulic chambers of the active orthotic device in the medial section. Finally, the system detects the position of the user in the walking cycle, detects the heel angle and detects the stepping frequency of the user and, in response, provides an optimized heel tilt by triggering one or more of the plurality of hydraulic actuators to add or remove liquid from one or more of the plurality of hydraulic chambers in a heel section of the active orthotic device, resulting in raising or lowering of the plurality of hydraulic chambers of the active orthotic device in the heel section of the active orthotic device.
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FIG. 1 is an isometric view of an Active Prosthetic Shoe Device (APSD) according to one embodiment of the present invention showing a device that the user would use on his/her right foot. -
FIG. 2 is a side view of the APSD according to one embodiment of the present invention showing the hydraulic chambers (rubber bellows) that separate the bottom and top insole layers. -
FIG. 3 is a top view of one embodiment of an APSD; showing the rigid layer to distribute the pressure points from the hydraulic chambers. -
FIG. 4 is a bottom view of an AASI according to one embodiment of the present invention showing the layout of the of hydraulic chambers (rubber bellows) in the sole of the shoe of the present invention; and it outlines the path of the fluid lines that lead to the 90 degree tube fittings. -
FIG. 5 is a view of the comfort insole that serves to house the hydraulic chambers while they are not inflated. -
FIG. 6 shows a condensed hardware outline of the entire system. -
FIG. 7 illustrates an isometric view of hydraulic actuator. -
FIG. 8 illustrates a compartment that houses all the hardware used in the APSD system. -
FIG. 9 top and bottom view of a compartment according to one embodiment of the present invention. -
FIG. 10 is a front view of a compartment showing the side view of the hydraulic actuators. -
FIG. 11 illustrates a rear isometric view of a compartment according to one embodiment of the present invention showing all the components. -
FIG. 12 illustrates a human walking gait cycle. -
FIG. 13 shows a flow diagram that illustrates the operation of the active arch mechanism. -
FIG. 14 shows a flow diagram that illustrates the operation of the heel tilt mechanism. -
FIG. 15 shows a flow diagram that illustrates the hardening of the bottom insole to increase walking efficiency. -
FIGS. 1-5 illustrate one embodiment of an Active Prosthetic Shoe Device (APSD) 10 in accordance with one aspect of the present invention. The illustrated embodiment is comprised of three primary active functions. The medial section of the APSD is comprised of a matrix ofhydraulic chambers 13. The chambers are typically made of circular channels of a flexible and durable plastic (rubber bellows) that trap fluid and expand depending on the volume of the fluid content found inside. In the illustrateddevice 10, hydraulic chambers are located in the medial section of the device to actively modify the arch support of a shoe. Continuing with the illustrated embodiment, three hydraulic chambers are located at the heel to actively tilt the heel to the desired angle. In addition, a system is located in thefrontal region 30 that makes the plantar side of the device harden at the point before push-off to create a rigid lever and assure an increased transfer of energy. - As shown, the
insole 12 is held horizontal above thebottom insole 15 at the point where the foot will contact the device. Typically, the twoinsoles FIGS. 1 and 2 .Insole 12 also serves to push or biashydraulic cylinders 13 in a downward direction. The APSD 10 dimensions could be modified to suit users of several shoe sizes. The outer edges on the exterior side of the APSD aresown 19 to help align both insoles. On the top of the insole 12 asupport insole 11 is located that helps distribute the point forces from the hydraulic chambers and the hydraulic chambers that tilt the heel. In the illustrated embodiment,comfort insole 14 is sandwiched betweeninsole 12 andinsole 15 and serves as a housing for the hydraulic chambers. The cylinders are typically housed at cut-outs tube fittings 16 and passing through thechannels 17 found in thebottom insole 15. - As shown in
FIGS. 5 and 6 , still referring to the embodiment illustrated inFIGS. 1-5 , APSD 10 is shown coupled to a schematic of the hardware involved in the system. The system is typically comprised of aplantar pressure sensor 21 that captures the dynamic in-shoe pressure distribution, which allows determination of accurate pressure patterns during gait and determination of the user's activity or stepping frequency. Thissensor 21 is linked to themicroprocessor 28, which in turn directs themotor driver 32 to power the gearedelectric motor 23 using pulse width modulation at high frequencies to allow for precise proportional control. The gearedelectric motor 23 turns theoutput gear 35 having aninternal thread 25 that matches the thread of the threadedrod 25. By turning theoutput gear 35 using the gearedmotor 23 andmotor output gear 34, the motor-threaded rod mechanism is converted into a linear actuator that drivespiston 26 alonghydraulic actuator 22. Typically, the components of eachhydraulic actuator 22 are held together by analuminum bracket 36. The bracket also serves to mount eachhydraulic actuator 22 toportable compartment 31 illustrated and described with respect toFIGS. 8-11 . The quantity of liquid in eachhydraulic chamber 13 is typically determined by the position of thepiston 26 along thehydraulic actuator 22, and the position of thepiston 26 is determined by anencoder 24 located at the end of the motor responsible for reading the motors turns. Liquid is dispensed to thefittings 16 coupled to thehydraulic chambers 13 through theexhaust 37 of thehydraulic actuator 22. The amount of liquid in eachhydraulic chamber 13 creates the correct arch form to help the user's foot function properly and complete a close-loop control system with the reaction forces produced on theplantar pressure sensor 21 by the user's foot. - In the illustrated embodiment, the system is powered by a
portable battery 29. Continuing with the illustrated embodiment as shown, eachhydraulic chamber 13 is actuated by its own hydraulic actuator. The electronic components in the system, such as thepressure sensors 21, communicate and are powered throughdata lines 27 that couple thesensor 21 to themicroprocessor 28. - Referring to the illustrated embodiment in
FIG. 1 , the system (sensors, actuators, battery, and all relevant electronics) should be sufficiently small and light weight to wear around the waist or the back.FIGS. 8-11 illustrate acompartment 31 that houses components and is configured to be worn around the back. - In order to better understand the operation of the system, the function in one walking cycle is illustrated and described. The proposed system works by tracking the stepping frequency and the position of the foot in a walking cycle by using a
plantar pressure sensor 27 array. The system of the illustrated embodiment is typically comprised of three functions: modifying arch support, tilting the heel and providing a rigid lever at push-of, each function depending upon the variables associated with a person's gait cycle. A typical human's walking gait cycle is illustrated inFIG. 12 . - At initial contact with the ground 40 (right foot), as illustrated in
FIG. 12 , the system of the illustrated embodiment aids the foot by absorbing impact and stabilizing the foot as it makes contact with the ground. The system is configured to zero thehydraulic actuators 46 and run, and then proceed to measureplantar pressure distribution 47, determine steppingfrequency 48, readuser preferences 49, and access statistical information of the user's previous steps 50. The system provides the user with an optimizedarch 51 support in theloading response section 41 of the gait cycle, as illustrated inFIG. 12 . If the arch support needscorrection 53, thehydraulic actuators 13 are either raised 54 or lowered 55. If the system does not require correction, the system typically enterssleep mode 57 and thetimer loop 56 is reset. Duringmid-stance 42, an optimized arch and heel support should be created for both feet. As the user approachesterminal stance 43, the left foot should be ready to absorb ground reaction forces and prepare the arch support design, and the right foot should be starting to form a rigid lever to help the user push-off the ground. At the point of pre-swing 44, the system should be helping the user support its left foot and help propel its right foot by hardening the bottom of the insole at the proper location, with the proper force and timing (duration). In the last phase of the human walking cycle, calledswing 45, the user should have its left foot supported by theAPSD 10, system and three mechanisms described above should be relaxed on the right foot, saving energy, and preparing to contact the ground and repeat the cycle. - The system that controls the heel tilt illustrated in
FIG. 14 , functions by detecting the position of the user in the walkingcycle 58, detects theheel angle 59, and finally detects the user's speed (steeping frequency) 60. The system then processes theinputs 61, detects the location of thehydraulic actuators 62, and applies the adequate correction to theheel tilt 63. - The system adjusts the height of the
hydraulic chambers 13 by actively filling and emptying thehydraulic chambers 13 in the medial section of theAPSD 10 to reproduce an effective arch design that best helps the foot perform its natural function in that walking cycle. - The system that creates the rigid lever in order to increase walking efficiency in flatfoot, found in
FIG. 15 , will be described. The system initiates and begins by collecting data on past user statistics 64 (where the user typically bends the shoe before push-off, how much force the user applies in that area, and other relevant information). The system detects the stepping frequency of the user 65 and read the user's past settings 66. Once this operation is accomplished, the system detects the user's position in the walkingcycle 67 and calculates the following: force to apply 68, position to applyforce 69, and time to applyforce 70. One these parameters have been calculated and verified, the system actuates the bottom of theinsole 71. - The system may be set to change its arch support under a certain condition that a certain percent change in pressure distribution in the medial section of the
APSD 10 occurs. Such a change could be caused by the user changing his/her walking speed or taking part in another activity. By using this mode, the system may greatly decrease its power consumption. The mechanism that varies the tilt of the heel is typically active during each cycle as well as the mechanism that hardens the insole before push-off 30. The threehydraulic chambers 13 located in the heel changes their height, and therefore results in that section of the heel to tilt inward or outward (varus or valgus) at a specific point in the walking cycle. The arch design and heel tilt angles depend on the activity, stepping frequency, pressure feedback collected by system (the plantar pressure sensor 27), and statistical values collected from previous walking cycles. The system computes the best arch form, heel tilt, and rigidity factor at push-off to aid an individual reproduce a healthy and optimized foot function. The function of each mechanism is outlined in the flow diagram inFIG. 13 . - To determine what configuration will work best for each user, an optimized pressure distribution model may be developed and calibrated from experimental results to suit each user. A large data set is collected from a series of controlled multistep experiments. The results are used to form a conservative arch design that best stabilizes the foot. The computer model is verified by examining the trial-to-trial repeatability and continues to adapt over time to suit the individual needs of that particular person. A feedback controller efficiently manages the arch support of the shoe depending on an optimized mathematical model that determines the form of the arch for a certain stepping frequency and activity.
- The construction details of the
APSD 10 of the illustrated embodiment shown inFIGS. 1-5 are as follows:top insole layer 12 may be made of leather or any other material that is flexible, has a high friction coefficient, and withstands wear, such as, for example, a neoprene plastic or foam covered with textile.Layer 11 is typically made of a material that is more rigid thenlayer 12, so as to make sure that the forces exerted upward by thehydraulic chambers 13 are better distributed onto the foot.Hydraulic chambers 13 are typically made of a material such as rubber or silicon that expands and can handle multiple cycles of use without cracking or leaking. The outer wall of thehydraulic chambers 13 is typically reinforced with a textile sleeve to limit hydraulic chamber's 13 lateral expansion.Layer 14 provides a space for the fluid chambers to settle when they are not fully inflated.Layer 14 also serves as a way to bias initial expansion.Layer 14 may be manufactured of a material that is comfortable, such as a gel or silicone.Bottom layer 15 may be casted into a mold that maintains its outer counter and traps the fluid chambers (rubber bellows), fluid lines and tube fittings. This material should be flexible once casted so as to allow for it to flex under use. The interconnections between the fluid chambers, fluid lines, and fluid fittings shall not leak. In one embodiment, the hydraulic actuator is made of 2024 aluminum and uses a double lip o-ring seal. The output gears 34 are typically made out of brass, but any suitable material may be used without departing from the intended scope and spirit of the present invention. - A novel perdorthic device is described that is versatile and adaptive, more so then current static in-shoe orthopedic devices. The present invention illustrated and described with respect to
FIGS. 1-15 is an active orthotic that principles may be applied to office chairs or beds. For example, an array ofhydraulic chambers 13 would line the seat and backrest of an office chair. The chair itself would compute the pressure distribution being exerted on the chair by the user and would adjust the pressure in each chamber to both modify the user's poster and to equalize the pressure distribution to a predetermined optimized model. In a similar fashion, ifhydraulic chambers 13 line the top of a bed, then the system could measure the reaction forces of the person lying on the bed using a pressure sensor array and modify the shape of thehydraulic chambers 13 to best accommodate the shape of the person, ultimately better distributing contact pressure and reducing peak pressure points. Instead of using a higher density liquid, thehydraulic chambers 13 may be inflated with air. - While the foregoing written description of the invention enables one of ordinary skill to make and use what is considered presently to be the best mode thereof, those of ordinary skill will understand and appreciate the existence of variations, combinations, and equivalents of the specific embodiment, method, and examples herein. The invention should therefore not be limited by the above described embodiment, method, and examples, but by all embodiments and methods within the scope and spirit of the invention.
Claims (18)
1. An active orthotic device comprising:
a first insole;
a second insole;
a plurality of hydraulic chambers disposed between the first insole and the second insole, the chambers configured to hold liquid within an interior of the chamber, the first insole is configured to bias the plurality of hydraulic chambers in a downward direction;
a plurality of tube fittings, each tube fitting coupled to the plurality of hydraulic chambers;
a plantar pressure sensor disposed on a surface of the first insole;
a microprocessor coupled to the plantar pressure sensor, the microprocessor configured for receiving signals from the plantar pressure sensor and controlling the amount of liquid in the plurality of hydraulic chambers;
a plurality of hydraulic actuators coupled to the microprocessor, each actuator coupled to one of the plurality of hydraulic chambers through one of the plurality of tube fittings, the plurality of hydraulic actuators further having a geared electric motor and a piston, the piston configured to add liquid to and remove liquid from the interior of the hydraulic chamber, the geared electric motor configured to position the piston in response to signals from the microprocessor; and
a device compartment for storing the microprocessor and the plurality of hydraulic actuators.
2. The active orthotic device of claim 1 , further comprising a motor driver coupled to the microprocessor and each geared electric motor of the plurality of hydraulic actuators, said motor driver configured to power the geared electric motor.
3. The active orthotic device of claim 2 , wherein the geared electric motor is powered using pulse width modulation.
4. The active orthotic device of claim 1 , wherein the plurality of hydraulic actuators further comprises a first output gear, a second output gear and a threaded rod, the first output gear coupled to the geared electric motor and the second output gear coupled to the threaded rod, the threaded rod coupled to the piston, wherein the first and second output gear are in contact such that rotational movement of the geared electric motor is converted into linear movement of the piston to drive the piston of the hydraulic actuator to regulate the quantity of liquid in the plurality of hydraulic chambers.
5. The active orthotic device of claim 4 , further comprising an encoder coupled to the geared electric motor for reading the number of motor turns so as to control the quantity of liquid in the plurality of hydraulic chambers.
6. The active orthotic device of claim 1 , wherein said plurality of hydraulic chambers further comprises a first plurality of medial hydraulic chambers configured to modify the arch support provided to a user's foot and a second plurality of heel hydraulic chambers configured to tilt the heel of a user to a desired angle.
7. The active orthotic device of claim 6 , further comprising a support insole on the surface of the first insole located directly above the plurality of hydraulic chambers, said support insole distributes point forces from the medial hydraulic chambers and the heel hydraulic chambers.
8. An active orthotic device comprising:
a first insole;
a second insole;
a plurality of hydraulic chambers disposed between the first insole and the second insole, the chambers configured to hold liquid within an interior of the chamber, the first insole is positioned relative the plurality of hydraulic chambers to bias the plurality of hydraulic chambers in a downward direction;
a plantar pressure sensor disposed on a surface of the first insole, the plantar pressure sensor configured for detecting the pressure from an arch of a user's foot;
a plurality of hydraulic actuators, each actuator coupled to one of the plurality of hydraulic chambers, the plurality of hydraulic actuators configured to actively add and remove liquid from the plurality of hydraulic chambers; and
a microprocessor coupled to the plantar pressure sensor and the plurality of hydraulic actuators, the microprocessor configured for receiving one or more signals from the plantar pressure sensor, and, in response to the one or more signals, controlling movement of the plurality of hydraulic actuators to regulate the quantity of liquid in the plurality of hydraulic chambers.
9. The active orthotic device of claim 8 , further comprising a device compartment for storing the microprocessor and the plurality of hydraulic actuators.
10. The active orthotic device of claim 9 , wherein the plurality of hydraulic actuators further comprises a geared electric motor and a piston, the piston configured to add liquid to and remove liquid from the interior of the hydraulic chamber, the geared electric motor configured to position the piston in response to signals from the microprocessor.
11. The active orthotic device of claim 10 , further comprising a motor driver coupled to the microprocessor and each geared electric motor of the plurality of hydraulic actuators, said motor driver configured to power the geared electric motor.
12. The active orthotic device of claim 11 , wherein the plurality of hydraulic actuators further comprises a first output gear, a second output gear and a threaded rod, the first output gear coupled to the geared electric motor and the second output gear coupled to the threaded rod, the threaded rod coupled to the piston, wherein the first and second output gear are in contact such that rotational movement of the geared electric motor is converted into linear movement of the piston to drive the piston of the hydraulic actuator to regulate the quantity of liquid in the plurality of hydraulic chambers.
13. The active orthotic device of claim 12 , further comprising an encoder coupled to the geared electric motor for reading the number of motor turns so as to control the quantity of liquid in the plurality of hydraulic chambers.
14. The active orthotic device of claim 13 , wherein said plurality of hydraulic chambers further comprises a first plurality of medial hydraulic chambers configured to modify the arch support provided to a user's foot and a second plurality of heel hydraulic chambers configured to tilt the heel of a user to a desired angle.
15. The active orthotic device of claim 14 , further comprising a support insole on the surface of the first insole located directly above the plurality of hydraulic chambers, said support insole distributes point forces from the medial hydraulic chambers and the heel hydraulic chambers.
16. A method of correcting a user's arch support using an active orthotic device comprising:
providing an active orthotic device for correcting a user's arch support, the active orthotic device having,
a first insole,
a second insole,
a plurality of hydraulic chambers disposed between the first insole and the second insole, the chambers configured to hold liquid within an interior of the chamber, the first insole is positioned relative the plurality of hydraulic chambers to bias the plurality of hydraulic chambers in a downward direction,
a plantar pressure sensor disposed on a surface of the first insole, the plantar pressure sensor configured for detecting the pressure from the arch of a user's foot,
a plurality of hydraulic actuators, each actuator coupled to one of the plurality of hydraulic chambers, the plurality of hydraulic actuators configured to control the amount of liquid in the plurality of hydraulic chambers, and
a microprocessor coupled to the plantar pressure sensor and the plurality of hydraulic actuators, the microprocessor configured for receiving one or more signals from the plantar pressure sensor, and, in response to the one or more signals, controlling movement of the plurality of hydraulic actuators to regulate the quantity of liquid in the plurality of hydraulic chambers,
measuring the plantar pressure distribution from a user's foot, determining the stepping frequency of the user, and reading statistical information regarding the user's previous steps and, in response, providing an optimized arch support by triggering one or more of the plurality of hydraulic actuators to add or remove liquid from one or more of the plurality of hydraulic chambers in a medial section of the active orthotic device, resulting in raising or lowering of the plurality of hydraulic chambers of the active orthotic device in the medial section; and
detecting the position of the user in the walking cycle, detecting the heel angle and detecting the stepping frequency of the user and, in response, providing an optimized heel tilt by triggering one or more of the plurality of hydraulic actuators to add or remove liquid from one or more of the plurality of hydraulic chambers in a heel section of the active orthotic device, resulting in raising or lowering of the plurality of hydraulic chambers of the active orthotic device in the heel section of the active orthotic device.
17. The method of claim 16 , further comprising:
collecting data on the walking gait of the user, detecting the stepping frequency of the user, reading the data on the walking gait of the user, detecting the user's position in the walking cycle; and
calculating a force to apply, a position of the force and a time to apply the force and, in response, providing a rigid lever by triggering one or more of the plurality of hydraulic actuators to add or remove liquid from one or more of the plurality of hydraulic chambers in a heel section of the active orthotic device, resulting in raising of the plurality of hydraulic chambers of the active orthotic device.
18. The method of claim 17 , wherein the collecting data on the walking gait of the user further comprises collecting data on an area where a user typically bends the shoe before push-off and how much force the user applies to the area.
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US13/489,332 US20130219745A1 (en) | 2012-02-27 | 2012-06-05 | Walking Device |
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US201261603579P | 2012-02-27 | 2012-02-27 | |
US13/489,332 US20130219745A1 (en) | 2012-02-27 | 2012-06-05 | Walking Device |
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US20130219745A1 true US20130219745A1 (en) | 2013-08-29 |
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US13/489,332 Abandoned US20130219745A1 (en) | 2012-02-27 | 2012-06-05 | Walking Device |
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