Abstract: Systems and methods of simulating dental treatments are disclosed. A method may include capturing a first 2D image of a patient's face, including the patient's teeth, building a parametric 3D model of the patient's teeth and gingiva based on the first 2D image, developing a simulated outcome of a dental treatment of the patient's teeth by rendering the parametric 3D model with the patient's teeth in one or more positions and/or orientations corresponding to the treatment goals of the dental treatment plan, and rendering a second 2D image of the patient's face with gingiva and teeth according to a simulated outcome of the dental treatment plan. As noted herein, the dental treatment plan may include orthodontic and/or restorative elements. The simulated outcome may correspond to estimated outcomes and/or intended outcomes of the dental treatment plan.

Abstract: The present disclosure provides computing device implemented methods, computing device readable medium, and molds for filling undercut areas of teeth relative to an axis of placement. Filling undercut areas of teeth relative to an axis of placement can include calculating an undercut area of a tooth relative to an axis of placement of part of a dental appliance over a number of teeth and a height of contour that is defined based on the axis of placement. Filling undercut areas of teeth relative to an axis of placement can also include filling in a part of the undercut area of the tooth with a virtual filler wherein the undercut is filled to within a threshold distance from the tooth that is defined relative to the axis of placement and the height of contour.

Abstract: An orthodontic aligner includes a shell defining at least one cavity sized to receive one of a patient's teeth. The cavity includes a lingual portion, a labial portion, and an occlusal portion. A bite structure forms at least a portion of the occlusal portion and is configured to be spaced apart from an occlusal surface of the patient's tooth by a distant sufficient to interfere with full closure of the patient's jaws. The bite structure has a non-planar surface that does not conform to the patient's tooth. The non-planar surface includes at least two spaced-apart projections separated by a boundary. The spaced-apart projections are spherical-like projections or ellipsoidal-like projections. The boundary has a grid-like appearance that spans the bite structure side to side. The spaced-apart projections define a tooth-engaging plane of the bite structure. The bite structure is an integral portion of the shell.

Abstract: The present disclosure describes devices, systems, and methods for monitoring use of an oral appliance in an oral cavity using extra-oral sensor(s). One method includes sensing one or more physical properties of an oral appliance using an extra-oral sensor, providing a compliance signal from the extra-oral sensor, identifying one or more patient compliance factors based on the compliance signal, the one or more patient compliance factors providing a basis to identify an extent of compliance of usage of the oral appliance with an orthodontic treatment plan, determining the extent of compliance, and outputting the extent of compliance.

Abstract: Indirect bonding tray systems are disclosed where the tray may generally comprise one or more individual modules each defining a receiving channel and configured for placement upon a dentition of a subject. A removal tab having a length may extend transversely relative to the individual module and a pivoting portion may be located away from the removal tab such that the removal tab is rotatable about the pivoting portion.

Abstract: A series of appliances including a first shell and a second shell can be designed to incrementally implement a treatment plan. The first and second shells can have cavities designed to receive teeth of a jaw. A first number of bite adjustment structures can be formed of a same material as the first shell, extending therefrom and designed to interface with teeth of a second jaw. The first number of bite adjustment structures can have a first shape and location specific to a first stage of the treatment plan. A second number of bite adjustment structures can be formed of a same material as the second shell, extending therefrom and designed to interface with teeth of the second jaw. The second number of bite adjustment structures can have a second shape and location, different than the first shape and location, specific to a second stage of the treatment plan.

Abstract: A dental observation device by which, without displaying, in an overlapping manner, a visible light image of an image-capturing site in an oral cavity captured by a 3-D camera and 3-D image information on the image-capturing site in the oral cavity acquired in advance, an invisible portion in the visible light image is easily recognized. An observation system includes a visible light 3-D camera; a relative position calculator; a 3-D information storage storing 3-D image information acquired in advance; an image display displaying, side by side, a 2-D captured image captured by the visible light 3-D camera and 2-D converted image based on the 3-D image information corresponding to the surgical operation target site; and a display direction adjuster displaying, in the image display, the 2-D converted image in a predetermined direction on the basis of the image-capturing direction detected by the relative position calculator.

Abstract: A breathable adhesive bandage, sticking plaster or plaster includes a fabric layer, a pad and an adhesive. The adhesive may provide only partial coverage of the fabric layer, allowing breathability. The pad and/or fabric layer may be formed from wool, such as merino wool. A backing may be applied to the adhesive layer.

Abstract: Disclosed embodiments relate to wound therapy apparatuses and methods for use in negative pressure wound therapy (NPWT). Such wound therapy apparatuses and methods may reduce maceration during NPWT. The wound therapy apparatus may include a porous hydrophobic layer surrounded by a hydrophilic ring. The hydrophilic ring may serve to prevent passage of liquid while negative pressure is applied to the wound, but allow liquid passage to an absorbent ring when negative pressure is no longer applied. A transmission layer may also be included, underlying the absorbent layer.

Abstract: The present invention relates to garments and kits, including uses thereof, for providing therapeutic compression such as compression therapy for the treatment of circulatory disorders such as Lymphedema and Venous Disease.

Abstract: In one embodiment, an anatomical support device includes an elongate body. The elongate body includes a first portion extending along a longitudinal axis between a first end and an oppositely positioned second end, a first wing extending transversely from the first portion, and a second wing extending transversely from the first portion. An adhesive material is positioned on at least a portion of one side of the elongate body. The elongate body is rigid in a first direction extending in-line with the longitudinal axis and is stretchable in a second direction extending transversely to the longitudinal axis.

Abstract: Disclosed is a moisture-retaining body having a water-absorbing surface, having a structure in which, from a water-absorbing surface side, a water-permeable layer having water disintegrability and water permeability, a moisture-retaining layer having water disintegrability, water absorbability, and water retainability, a water-repellent layer including a water-soluble film and dots of a dot-like water-repellent resin with a diameter of 5 ?m to 150 ?m dispersed on a surface side of the water-soluble film facing the moisture-retaining layer, and a support layer having water disintegrability are sequentially laminated, as a moisture-retaining body which is quickly dissolved or decomposed by coming into contact with a large amount of water when dumped in a flush toilet or the like while being prevented from being dissolved or decomposed by retained moisture.

Abstract: An absorbent article having longitudinal cuffs of improved structure is disclosed. The improved cuffs may be elasticized by a plurality of elastic strands that are substantially greater in number, closer in spacing, lower in pre-strain, and lower in decitex, or any combination of these, as compared with those in conventional articles. This combination of features results in ruffles or gathers of cuff material joined to the elastic strands that are substantially greater in machine-direction frequency and substantially lesser in z-direction amplitude, than those in conventional articles. As a result, the cuff structure lies more closely and evenly against the wearer's skin, has an improved, more cloth-like appearance, provides improved gasketing, and provides improved wearer comfort, as compared with cuff structures in conventional articles. A method for manufacturing articles with such cuff structures, utilizing a warp beam as a supply mechanism, is also disclosed.

Abstract: A method and apparatus for producing absorbent sanitary articles according to a Machine Direction technique, each sanitary article having an absorbent body, a front waistband and a rear waistband having different lengths from each other.

Abstract: An absorbent article comprising an absorbent core sandwiched between a liquid permeable topsheet and a liquid impermeable backsheet, and an acquisition distribution layer positioned between said topsheet and said absorbent core, wherein the absorbent core comprises absorbent material selected from the group consisting of cellulose fibers, superabsorbent polymers and combinations thereof, wherein said absorbent core comprises at least one core wrap substrate enclosing said absorbent material, and wherein a top layer of said core wrap is adhered to a bottom layer of said core wrap to form one or more channels substantially free of said absorbent material, wherein said channels have a length extending along a longitudinal axis and the absorbent core has a length extending along said longitudinal axis and wherein the length of said channels is from 10% to 95% of the length of said absorbent core and wherein said channels each follow a substantially continuous path such as from a first end of a channel to a second

Abstract: A disposable diaper in which an absorbent body (7) is provided on a crotch part of a pants-shaped exterior member (2), wherein the absorbent body (7) is adhered to a skin-facing side of the exterior member (2) at a first adhering region (14), an inner sheet (5) and an outer sheet (6) of the exterior member (2) are adhered to each other at a second adhering region (16), the second adhering region (16) includes a second middle adhering region (16M) provided at the crotch part, a second central front adhering region (16CF) located anterior thereto so as to overlap with the first adhering region (14) and a second central rear adhering region (16CB) located posterior thereto so as to overlap with the first adhering region (14), and second front non-adhering regions (17F) are formed on both sides of the second central front adhering region (16CF) in the width direction so as to overlap with the absorbent body (7) and/or second rear non-adhering regions (17B) are formed on both sides of the second central rear adher

Abstract: The present invention relates to a fastening member comprising a base pane, a closure member extending laterally from the base panel, the closure member comprising a closure member upper edge and a closure member lower edge, and a fastening element disposed on the closure member, the fastening element comprising a fastening element upper edge and a fastening element lower edge, wherein the closure member upper edge comprises a concave portion along the fastening element upper edge and the closure member lower edge comprises a convex portion along the fastening element lower edge, and wherein the closure member extends upwardly laterally.

Abstract: An absorbent article has a first waist region, a second waist region, a crotch region disposed between the first and second waist regions; and a chassis comprising a topsheet, a backsheet, and an absorbent core disposed between the topsheet and backsheet. The article also includes a primary fastening system and secondary fastening system. The primary fastening system has a primary fastening component disposed in the second waist region and a primary receiving component disposed in the first waist region and operatively engageable with the primary fastening component. The secondary fastening system includes a secondary fastening component disposed in the first waist region and a secondary receiving component disposed in the second waist region and operatively engageable with the secondary fastening component. The article further includes a decoupled zone disposed longitudinally inboard of the secondary fastening component.

Abstract: An implant and suture locking system is provided. The implant can include a lateral or distal anchor, and a medial or proximal anchor. One or more suture loops can extend between and operatively connect the anchors. A medial suture loop can extend through apertures in the medial anchor to provide efficient and easily adjustable tensioning and suture locking for the implant.

Abstract: An implantable prosthesis for hernia repair is designed for minimally invasive, robotic, or laparoscopic surgery. Various embodiments of the implantable prosthesis are tailored for inguinal hernia repair, including direct, indirect, and bilateral hernia defects, as well as for femoral hernia repair.

Abstract: Devices, methods, and systems are provided for loading an implantable device into a container. One aspect of the loading system contains a loader element with a loading tunnel that is configured to gradually contract an implantable device into a compressed state of reduced size relative to an expanded state as the implantable device travels through the loading tunnel.

Abstract: Vascular filters and deflectors and methods for filtering bodily fluids. A blood filtering assembly can capture embolic material dislodged or generated during an endovascular procedure to inhibit or prevent the material from entering the cerebral vasculature. A blood deflecting assembly can deflect embolic material dislodged or generated during an endovascular procedure to inhibit or prevent the material from entering the cerebral vasculature.

Abstract: A stent includes a tubular body formed of one or more interwoven wires, the tubular body having first and second opposing open ends and a lumen extending therebetween. The stent further includes a first anchor member disposed adjacent the first open end and a second anchor member disposed adjacent the second open end, the first and second anchor members each extending radially outward from the tubular body, the first and second anchor members each having an outer diameter larger than an outer diameter of the tubular body disposed between the first and second anchor members. A plurality of spacer members are disposed around the first open end and extending longitudinally beyond the first open end, wherein when a pulling force is applied to the spacer members, the outer diameter of the tubular body is not reduced.

Abstract: Implantable tensile load-bearing grafts having synthetic components stitched through biological components are disclosed. The synthetic components can be biodegradable and/or non-biodegradable and of differing tensile strengths from each other and the biological component. Methods of making the grafts are also disclosed.

Abstract: The invention relates to a medical implant (1), comprising at least a first cortical fixation device (200) for fixing a ligament or tendon graft (G) in a desired position, wherein said first cortical fixation device (200) comprises a body (201) having a front side (201a) and a rear side (201b), which rear side (201b) faces away from the front side (201a), and wherein said body (201) comprises a first and an adjacent second through-hole (210, 211), which through-holes (210, 211) extend from the front side (201a) to the rear side (201b) of said body. According to the invention the medical implant (1) further comprises a first suture thread (100) extending through the through-holes (210, 211) and forming a twisted loop (104) and a non-twisted loop (105) on the front side (201a) of the body (201), and a sliding knot (108) on the rear side (201b) of the body (201), and wherein the medical implant (1) comprises a second suture thread (300) extending through the sliding knot (108).

Abstract: An implant can include a flexible body made of a non-bioresorbable hydrogel material. The implant can also include a radiopaque marker located within the flexible body, where the body and the radiopaque marker can be implanted in a body cavity to mark the cavity in a radiographic image of the cavity.

Abstract: Systems and methods for data-compressive sensing in accordance with embodiments of the invention are illustrated. In one embodiment, a sensor array includes an array of sensor circuitries including a sensor and a comparator. Sensor circuitries in the array are connected via wires which form a series of wired-OR circuits. Readouts can be used to measure the signal on the wires and a decoder in communication with the readouts can be used to resolve signals sensed by particular sensors in the array and their locations.

Abstract: An implantable accommodating intraocular lens (IOL) has an optic lens sized to fit within a capsular lens bag of an eye; and a plurality of haptics angularly spaced around and radially extended from the optic lens, with each haptic: having a tongue that forms an arcuate sulcus gripping part that, in use within the capsular lens bag, inserts into and follows a circumferential groove of the sulcus to restrict circumferential sliding of the tongue around the sulcus; and being structured to move, under contraction and expansion of ciliary muscles of the eye, to adjust the optic lens to accommodate a focal power of the eye.

Abstract: This disclosure describes various sinus scaffolds having fiber-based and non-fiber based designs, materials, devices, kits and methods that may be used to treat chronic sinusitis. These designs vary in form, dimension, and delivery location (i.e., maxillary, frontal, ethmoidal, sphenoidal sinuses, and middle meatus). In addition, therapeutic agent(s) may optionally be included within the scaffolds for local delivery over a brief or extended period of time.

Abstract: A nasal tissue implant for reconstruction and tissue engineering of nasal tissue in a subject includes a tissue scaffold component comprising a biocompatible polymeric material having a plurality of open pores configured to support cell growth. The tissue scaffold component conforms to a portion of the subject's nasal region and defines at least a portion of the subject's nasal anatomy. A method of making an implantable nasal tissue implant for reconstructing a portion of a nasal anatomy of a human or other animal subject is also provided that includes laser sintering or three-dimensional (3D) printing a biocompatible polymeric material to form a tissue scaffold component comprising a biocompatible polymeric material having a plurality of open pores configured to support cell growth. Again, the tissue scaffold component substantially conforms to a nasal region specific to the human or other animal subject.

Abstract: A prosthetic heart valve includes an annular frame that has an inflow end and an outflow end and is radially compressible and expandable between a radially compressed configuration and a radially expanded configuration. The prosthetic heart valve further includes a leaflet structure positioned within the frame and secured thereto, and an outer sealing member mounted outside of the frame and adapted to seal against surrounding tissue when the prosthetic heart valve is implanted within a native heart valve annulus of a patient. The sealing member can include a mesh layer and pile layer comprising a plurality of pile yarns extending outwardly from the mesh layer.

Abstract: The present invention provides a modular prosthetic valve device having two or more device modules for percutaneous delivery unassembled at or near the valve implantation site and assembly at least in part using a self-assembly member, and a system and method of folding, delivering and assembling the device. The device modules may include a support structure and a valve module. The valve module has an unassembled, folded delivery configuration, and an unfolded, assembled (via the self-assembly member) working configuration. The valve module may be a single-piece leaflets substructure or a plurality of valve sections. The self-assembly member has a delivery configuration and may be reverted to a preset configuration for valve module assembly. The unassembled valve module may be rolled along its circumferential axis towards its height to a folded diameter equivalent to one rolled leaflet, providing a percutaneous valve device having a smaller delivery diameter than pre-assembled valve devices.

Abstract: A transcatheter valve prosthesis includes a stent having a crimped configuration for delivery within a vasculature and an expanded configuration for deployment within a native heart valve. The stent includes at least one axial frame member. The transcatheter valve prosthesis includes at least one outflow marker positioned on the at least one axial frame member. The transcatheter heart valve prosthesis may include inflow markers positioned within the inflow portion of the stent. The transcatheter heart valve prosthesis may include two outflow markers disposed on axial frame members and being circumferentially and longitudinally offset from each other. The markers are configured to aid in axial and circumferential aligned of the transcatheter heart valve prosthesis within a native heart valve.

Abstract: An implantable device is disclosed. The device includes a two or three-piece frame assembly that is configured to be delivered in a series configuration and subsequently nested or telescoped in-situ.

Abstract: The present invention relates to an anchoring device (1) designed for anchoring a prosthetic heart valve inside a heart, comprising an extraventricular part (2) designed to be positioned inside an atrium or an artery and a ventricular part (3) designed to be positioned inside a ventricle, wherein the ventricular part comprises a double wall composed of an outer wall (4) and an inner wall (5) spaced apart at the level where the prosthetic heart valve is intended to be inserted, and wherein the anchoring device further comprises a predefined V-shaped groove (8) formed between the extraventricular part (2) and the ventricular part (3). The present invention also relates to an anchoring system (11) for anchoring a prosthetic heart valve inside a heart, comprising said anchoring device (1), a prosthetic heart valve support (12) and a prosthetic heart valve (13) connected to the prosthetic heart valve support (12).

Abstract: Systems, devices, kits, and methods are described for securing a bioprosthetic heart valve within an anatomical feature of a patient. Kits can comprise a bioprosthetic heart valve, a curable composition, and an applicator configured to deliver the curable composition to a target area. The bioprosthetic heart valve can comprise a support structure and one or more valve leaflets coupled thereto. The support structure can comprise a sewing portion peripheral of the bioprosthetic heart valve. The support structure and the valve leaflets can define a central flow orifice. The curable composition can comprise a pre-polymer composition and an initiator. Methods can comprise positioning the bioprosthetic heart valve within the anatomical feature of a patient, applying the curable composition to one or both of the bioprosthetic heart valve and the anatomical feature, and curing the curable composition for a cure time. The applying can be performed before or after the positioning.

Abstract: A prosthetic valve is provided that includes a tubular valve body and a plurality of prosthetic leaflets disposed within a lumen of the valve body. The valve body includes struts arranged in a cellular structure defined by first and second circumferential rows of four-sided closed cells. Each of the four-sided closed cells is defined by some of the struts, which are shaped so as to collectively define the following four sides: a left upstream side, a right upstream side, a left downstream side, and a right downstream side. The struts are joined at four corners of the four-side closed cell. Each of the four sides of each of the four-sided closed cells is double-strutted. Other embodiments are also described.

Abstract: A prosthetic heart valve including a frame, leaflet structure, and sealing member disposed around an outer surface of the frame is disclosed. As one example, the sealing member includes a knitted fabric layer, the knitted fabric layer comprising a base layer forming an inner surface of the knitted fabric layer, where the base layer has a mesh-like structure. The knitted fabric layer further comprises a plush outer surface comprising a plurality of pile yarns knit into loops and that extend outward from the base layer.

Abstract: Prosthetic heart valves may be delivered to a targeted native heart valve site via one or more delivery catheters. In some embodiments, the prosthetic heart valves are implanted using catheter-based deployment systems that include multiple control wires. In particular implementations, the deployment systems can include a retrieval catheter that can be used to recapture the prosthetic heart valve back into a delivery sheath after being expressed from the delivery sheath. The prosthetic heart valves occupy a small delivery profile, thereby facilitating a smaller delivery catheter system for advancement to the heart. Some delivery catheter systems can include a curved control catheter and/or a deflectable catheter to facilitate deployment of the prosthetic heart valve to a native tricuspid valve site via a superior vena cava or inferior vena cava.

Abstract: An implant assembly for a long bone is adapted to support an exo-prosthesis. The assembly includes a stem, a subdermal component and a percutaneous post. The stem has a proximal end that is adapted to be received in a surgically prepared medullary canal of the long bone, and a distal end having a surface that is adapted to promote bone ingrowth. The subdermal component includes a proximal portion that is adapted for attachment to the distal end of the stem, and a fixation surface that is adapted to promote soft tissue fixation. The percutaneous post has a proximal end that is adapted to be attached to the subdermal component.

Abstract: The disclosure provides a cartilage substitute, which includes at least one cartilage unit, the cartilage unit including: a base, including a subcutaneous layer portion forming contact friction with a corresponding skeleton, a deep layer area portion contacting with a target skeleton and an intermediate layer portion provided between the subcutaneous layer portion and the deep layer area portion. A fluid storage cavity is disposed in the subcutaneous layer portion. A first communicating passage is disposed in the subcutaneous layer portion. A second communicating passage is disposed in the intermediate layer portion, a third communicating passage is disposed in the deep layer area portion. The fluid storage cavity, the second communicating passage and the third communicating passage are disposed to gradually increase hardness of the subcutaneous layer portion, the intermediate layer portion and the deep layer area portion.

Abstract: Hard-tissue implants are provided that include a bulk implant, a face, pillars, slots, and at least one support member. The pillars are for contacting a hard tissue. The slots are to be occupied by the hard tissue. The at least one support member is for contacting the hard tissue. The hard-tissue implant has a Young's modulus of elasticity of at least 3 GPa, and has a ratio of the sum of (i) the volumes of the slots to (ii) the sum of the volumes of the pillars and the volumes of the slots of 0.40:1 to 0.90:1. Methods of making and using hard-tissue implants are also provided.

Abstract: Embodiments of the present invention include a convertible prosthesis that is capable of conversion from a humeral head replacement to a reverse reconstruction without any removal of parts integrated into the patient's bony anatomy (e.g. implant stems). A desired overall implant inclination angle may be achieved by matching various implant stems with various reverse inserts, thus permitting a resection surface to be matched with an implant stem selection while also permitting a desired overall implant inclination angle to be achieved through the selection of an appropriate insert.

Abstract: A method of forming a composite titanium body for use in forming spinal implant interbodies includes selecting a metal alloy body, carving out a top portion and a bottom portion from the metal alloy body, and bonding a porous material to the carved-out top and bottom portions. Multiple pieces may be cut from the composite titanium body, each having a front face formed of the metal alloy, top and bottom portions formed of the porous material, and with a medial portion of the metal alloy extending from the front face to the back. Methods and devices for spinal interbodies having locking mechanisms to prevent bone screw back-out are also described.

Abstract: Spinal interbody fusion implants for use in posterior lumbar interbody fusions (PLIF), anterior lumbar interbody fusions (ALIF), transforaminal lumbar interbody fusions (TLIF) and transpsoas interbody fusions (DLIF), each of the implants including a 3-D printed titanium frame having meshed sidewalls, open top and bottom faces and a selectively closeable back plate for enclosing a posterior end of the frame. A machined, acid treated allograft bone graft is contained within the frame, the bone graft having a window for containing a biomaterial, anti-migration teeth and a ridge configured to mate with a slot within the frame for locking the graft in the frame.

Abstract: An acetabular implant kit includes a first acetabular component that has an inner surface that defines a first concave profile. A second acetabular component includes an inner surface that defines a second concave profile. An instrument includes an elongated body that has a first end and a second end. A head is connected to the second end of the body and has an engagement surface. The engagement surface includes a first convex profile and a second convex profile. The first and second convex profiles are arranged along a longitudinal axis of the head and have a first radius of curvature configured to congruently engage the first concave profile of the first acetabular component. The second convex profile has a second radius of curvature configure to congruently engage the second concave profile of the second acetabular component. The first radius of curvature is different than the second radius of curvature.

Abstract: A system and method of processing bone is disclosed. A tissue separator is utilized to separate tissue comprising at least one of muscle, periosteum and connective tissue from bone in a safe, sterile and efficient manner. In one aspect, the particle reducer can include an impeller positioned with respect to a cutting surface on a drum. At least one of the impeller and the drum is rotated by a power source such that harvested tissue frictionally engages the cutting surface. In another aspect, a source of pressurized fluid can be directed at tissue to separate bone from non-bone tissue.

Abstract: A device for ligament balancing includes a mount at a first end of the device and a head portion at a second end of the device, the head portion having a substantially planar surface, a first paddle, and a second paddle, wherein the first and second paddle are rotatable about a first longitudinal axis and a second longitudinal axis, respectively, relative to the substantially planar surface. The device further includes a stem extending from the head portion and a shaft extending between the stem and the mount. The mount includes a coupling portion configured to couple the device to a robotic device such that movement of the device is controlled by the robotic device.

Abstract: The present invention relates to a hand motion control system and a control method thereof, and more specifically, to a hand motion control system for a myoelectric hand, and to a control method thereof. The system enables not only grasping motions for grasping an object, but also the expression of hand gestures expressing emotions or intent, based on a limited myoelectric signal transmitted via two myoelectric sensors provided on the myoelectric hand. Furthermore, the system enables a wide variety of hand postures and grasp types that are determined by the position of a thumb, which can be changed by a user, thus easily expanding the range of applications of the myoelectric hand.

Abstract: A passive ankle-foot prosthesis to replicate a human foot. The passive ankle-foot prosthesis includes a foot part, an ankle frame, a yoke, and a spring. The ankle frame is attached fixedly to a second end of the foot part. The yoke is configured to be attached to a residual limb of a user. A first end of the yoke is pivotally attached to a first end of the ankle frame utilizing a pivot. The yoke is configured to rotate around a pivot axis. The pivot axis passes through the pivot. The spring is disposed between the ankle frame and the yoke. A first end of the spring is connected to a second end of the yoke. A second end of the spring is connected to a second end of the ankle frame. The spring is configured to apply an upward force to the second end of the ankle frame based on the yoke's rotational movements.