Abstract:
An attachment for a prosthetic foot comprising an attachment surface that couples to the edges of a foot plate of a prosthetic foot and an outer surface that functionally or cosmetically alters the foot plate of the prosthetic foot in order to adapt the prosthetic foot to the needs of the user. In another embodiment, a toe attachment for a prosthetic foot comprising a cavity that can receive the toe end of an elongate foot element of a prosthetic foot, the toe attachment that can functionally or cosmetically alter the elongate foot element in order to adapt the prosthetic foot to the needs of the user. In yet another embodiment, a seal cover that can removably engage a prosthetic foot and a cosmetic cover for a prosthetic foot, resulting in a substantially watertight connection between the seal cover and the prosthesis and the seal cover and the cosmesis.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application claims priority to U.S. Provisional Application No. 61/764,424 filed Feb. 13, 2013, which is hereby expressly incorporated in its entirety by reference herein and should be considered a part of this specification. 
     
    
     BACKGROUND 
       [0002]    1. Field 
         [0003]    Embodiments of the present invention relate to prosthetic feet and overmould attachments and cosmetic covers for prosthetic feet. 
         [0004]    2. Description of the Related Art 
         [0005]    Prosthetic feet of different designs are well known in the art. The various conventional designs have sought to solve various limitations associated with prosthetic feet. One limitation associated with prosthetic feet known in the art has to do with manufacturing prosthetic feet having foot plates with varying characteristics. Some of the possible variations of a foot plate include width, length, thickness, shape, and stiffness. Incorporating one or more of these variations into the design of a prosthesis can result in a prosthesis with characteristics that are desirable or beneficial for a particular user or a particular use. However, incorporating these variations directly into the foot plate during the manufacturing process can be expensive, time consuming and result in waste of the production materials. 
         [0006]    Accordingly, there is a need for an improved design that is economically efficient to manufacture while still providing the advantages to the user of having variations in the foot plate. 
         [0007]    Another limitation associated with prosthetic feet known in the art has to do with wear and tear on the prosthesis. Materials typically used in the art to produce prosthetic feet, such as carbon fiber, can be expensive and difficult to repair or replace. During the course of use of a prosthetic foot, normal wear and tear can result in undesirable cosmetic or structural damage to the foot plate or any other element of the prosthesis. Such damage can be very difficult or expensive to repair and can require that the entire foot plate of the prosthesis be replaced. 
         [0008]    Accordingly, there is a need for an improved design that protects the foot plate from the damage associated with normal wear and tear and allows for a damaged element or portion of the prosthesis to be easily and economically repaired or replaced. 
         [0009]    Yet another limitation associated with prosthetic feet known in the art has to do with water and/or debris, such as dirt, entering the cosmetic foot cover. This water and/or debris can be difficult to clean out from the cosmetic cover and can cause problems with the function of the cosmetic cover or prosthesis therein. On the other hand, sealing the opening of a cosmetic cover can limit the function of the ankle joint and make access for manipulation or adjustment of the ankle very difficult. 
         [0010]    Accordingly, there is a need for an improved foot cover or foot cover attachment that can prevent water and/or debris from entering the foot cover, but that will still allow for easy adjustments and manipulation of the ankle and attachment or adaptors, 
       SUMMARY 
       [0011]    In accordance with one embodiment disclosed herein, a prosthetic foot comprising at least one foot plate that can be coupled to an attachment is provided. The foot plate has a toe end, an ankle end, a toe surface or edge, an ankle surface or edge, medial and lateral side surfaces or edges, a top surface, and a bottom surface. The foot plate can be made of carbon fiber or any other material used in the art to manufacture foot plates for prosthetic feet. The foot plate can be generally straight, or it can be curved between the toe end and the ankle end such that the toe end is substantially horizontal while the ankle end is substantially vertical. The foot plate can be coupled to an attachment at the toe end, wherein the attachment extends at least partially along the length of the side surfaces from the toe end toward the ankle end. In some embodiments, the attachment extends all the way along the side surfaces wherein it is also coupled to the ankle surface. In embodiments in which the foot plate is curved and the attachment extends along the sides to at least the portion where the foot plate is curved, the portion of the attachment along the side surfaces will also curve to match the side surfaces. The foot plate can be coupled to an attachment that can extend at least partially over the top surface and/or at least partially over the bottom surface of the foot plate. In some embodiments, the prosthetic foot can have a heel plate connected to the bottom surface of the foot plate and extending away from the toe end of the foot plate. 
         [0012]    The foot plate can be removably coupled to the attachment. The foot plate can be coupled to the attachment using at least one clip mechanism, a series of clips, glue or epoxy, magnetic force, elastic properties of the attachment (e.g., press-fit connection) and/or any other coupling mechanism known in the art. In some embodiments, the attachment is not coupled with or in contact with the heel plate. 
         [0013]    The attachment can alter the shape of the foot plate such that the altered shape of the foot plate is more similar to the shape of a natural human foot. Alternatively, the altered shape of the foot plate can provide the prosthetic foot and its user with other functional or cosmetic benefits. For example, the altered shape of the foot plate can aid in fitting the prosthesis into a foot cover or shoe. 
         [0014]    In some embodiments, the foot plate has a lengthwise split beginning at the toe end of the foot plate and traversing at least part of the length of the foot plate that divides the foot plate resulting in a medial portion and a lateral portion. In some embodiments, the lengthwise split does not span the entire length of the foot plate, and thus the medial and lateral portions join into a singular foot plate at some point between the toe end and the ankle end of the foot plate. In some embodiments, the attachment will have a corresponding split at the toe end. The split in the foot plate and the attachment allow the medial and lateral portions to flex at least somewhat independently, improving functional properties of the prosthetic foot during rollover. 
         [0015]    In accordance with another embodiment disclosed herein, a prosthetic foot with a foot plate that can receive a coupleable toe attachment at the toe end of the foot plate is provided. The foot plate has a toe end, an ankle end, a toe surface, an ankle surface, medial and lateral side surfaces, a top surface, and a bottom surface. The foot plate can be made of carbon fiber or any other material used in the art to manufacture foot plates for prosthetic feet. The foot plate can be straight, or it can be curved between the toe end and the ankle end such that the toe end is substantially horizontal while the ankle end is substantially vertical. The ankle end of the foot plate can attach to an adaptor or a residual limb. The foot plate has sides that are substantially straight resulting in a more economical and efficient manufacturing process. The foot plate is manufactured to a standard size resulting in a more economical and efficient manufacturing process. 
         [0016]    The foot plate can be coupled at the toe end to a toe attachment that extends at least partially over the top surface and at least partially over the bottom surface of the foot plate. The foot plate can be removably coupled to the toe attachment, the toe attachment having a cavity that can receive the toe end of the foot plate. The toe attachment alters the shape of the foot plate such that the altered shape of the foot plate is more similar to the shape of a natural human foot. The altered shape of the foot plate can aid in fitting the prosthesis into a foot cover or shoe. 
         [0017]    In accordance with another embodiment, an overmould attachment that is coupleable to a foot plate of a prosthetic foot is provided. The overmould attachment is coupled to the toe end or toe surface of the foot plate, and at least partially along the medial and lateral side surfaces of the foot plate. In some embodiments, the attachment extends along the entire length of the side surfaces and at least partially onto an ankle surface of the foot plate. The attachment is removably coupleable to a prosthetic foot. The attachment is made out of polymer or a plastic-like material or a compressible material. In other embodiments, the attachment is made of any material used in the art. The attachment can alter the stiffness or thickness characteristics of the foot plate. 
         [0018]    The attachment alters the cosmetic appearance of the prosthetic foot and protects the prosthetic foot from wear and tear. The attachment can be coupled to a prosthetic foot without altering any fit adjustments made to the prosthetic foot. In some embodiments, the attachment alters the shape of the foot plate such that the altered shape of the foot plate is more similar to the shape of a natural human foot. Alternatively, the altered shape of the foot plate can provide the prosthetic foot and the user with other functional or cosmetic benefits. For example, the altered shape of the foot plate can aid in fitting the prosthesis into a foot cover or shoe. 
         [0019]    In accordance with another embodiment disclosed herein, an overmould attachment that includes an extended portion at the toe end of the foot plate is provided. The extended portion includes a cutout section resulting in a medial lobe and a lateral lobe. The cutout is generally U-shaped. The respective widths of the medial and lateral lobes result in a stiffness for the medial and lateral lobes, wherein varying the widths of the medial and lateral lobes results in varying the stiffness of the medial and lateral lobes. The characteristics of the medial and lateral lobes can result in improved rollover during use of the prosthetic coupled to the attachment. Additionally, the extended portion can aid in fitting the prosthesis into a foot cover or shoe. 
         [0020]    In accordance with another embodiment disclosed herein, a prosthetic foot is provided. The prosthetic foot comprises an elongate foot member having a distal toe end with a distal toe surface, a proximal ankle end, and medial and lateral surfaces extending along a length of the elongate foot member. The prosthetic foot also comprises an attachment member coupleable to the elongate foot member along an entire length of the attachment member. The attachment member is configured to attach to at least the distal toe surface and the medial and lateral surfaces of the elongate foot member to alter a shape of the prosthetic foot by increasing one or both of a width and a length of at least a portion of the elongate foot member. 
         [0021]    In accordance with another embodiment disclosed herein, a prosthetic foot is provided. The prosthetic foot comprises an elongate foot member having a distal toe end with a distal toe surface, a proximal ankle end, and medial and lateral surfaces extending along a length of the elongate foot member. The prosthetic foot also comprises an attachment member coupleable to the elongate foot member along the entire length of the attachment member. The attachment member is configured to attach to at least the distal toe surface and the medial and lateral surfaces of the elongate foot member and can alter the shape of the prosthetic foot by increasing one or both of a width and a length of at least a portion of the elongate foot member. The attachment member has a side profile that matches a profile of the elongate foot member. 
         [0022]    In accordance with yet another embodiment disclosed herein, a coupleable toe attachment for use with a prosthetic foot is provided. The toe attachment is removably coupleable to a prosthetic foot. The toe attachment further includes a cutout section that divides the top surface and bottom surface into a medial lobe and a lateral lobe. The cutout is generally U-shaped. The cutout, resulting in a medial and lateral lobe, gives the toe attachment a more anatomical or a “sandal toe” appearance. The respective widths of the medial and lateral lobes result in a stiffness for the medial and lateral lobes, wherein varying the widths of the medial and lateral lobes results in varying the stiffness of the medial and lateral lobes. Additionally, the toe attachment can aid in fitting the prosthesis into a foot cover or shoe. 
         [0023]    The toe attachment can have a cavity that can receive the toe end of foot plate of a prosthetic foot, such that the toe end of a foot plate fits inside the cavity. In some embodiments, at least part of the cavity extends all the way through the toe attachment. The toe attachment is coupled to a foot plate of a prosthetic foot using clips, glue or epoxy, magnetic force, and/or any other coupling mechanism known in the art. 
         [0024]    In accordance with another embodiment disclosed herein, a prosthetic foot is provided. The prosthetic foot comprises an elongate foot member having a toe end and an ankle end. The prosthetic foot also comprises a toe attachment removably coupleable solely to the toe end of the elongate foot member. The toe attachment has a top surface, a bottom surface, a distal end, a proximal end, the toe attachment defining a slot therein and having a length shorter than a length of the elongate foot member. The slot in the toe attachment extends from the top surface to the bottom surface defining a medial lobe and a lateral lobe of the toe attachment. The slot is configured to removably receive a strap of a sandal when said sandal is coupled to the prosthetic foot. 
         [0025]    In accordance with another embodiment disclosed herein, a seal cover for a cosmetic cover for a prosthetic foot is provided. Viewed from above, the seal cover generally has the shape of the cross-section of a human ankle or of the opening of a cosmetic cover for a prosthetic foot. The seal cover has an outer portion and an inner portion. The inner portion and the outer portion are made of different materials. The outer portion is a frame made of a plastic or plastic-like material. The inner portion is a membrane made of an elastic or flexible material. The top surface of the outer portion is substantially flat. The bottom surface can have two concentric lips that run substantially parallel to the perimeter of the outer surface that can removably engage the opening of a cosmetic cover for a prosthetic foot after a prosthetic foot has been inserted into the cosmetic cover, creating a substantially watertight connection between the outer portion and the cosmetic cover. 
         [0026]    The inner portion can include a membrane made of a flexible material, such as rubber or elastic, and has a circular O-ring opening that can engage a pyramid adaptor or foot plate or shank or pylon of a prosthetic foot system, creating a substantially watertight connection between the inner portion and the prosthetic foot system. In some embodiments, a collar adaptor can be placed on the prosthetic foot system that has a groove to receive the circular opening of the inner portion of the seal cover. 
         [0027]    In accordance with another embodiment disclosed herein, a seal cover for a cosmetic cover for a prosthetic foot. Viewed from above, the seal cover generally has the shape of the cross-section of a human ankle or of the opening of a cosmetic cover for a prosthetic foot. The seal has an outer portion and an inner portion. The inner portion and the outer portion are made of different materials. The outer portion is a frame made of a plastic or plastic-like material. The inner portion is a membrane made of an elastic or flexible material. The top surface of the outer portion is substantially flat. The bottom surface of the outer portion of the seal cover engages the rim at the opening of the cosmetic cover after a prosthetic foot has been inserted into the cosmetic cover using a series of hooked protrusions or teeth that can removably engage complementary cavities in the rim of the cosmetic cover in order to facilitate the engagement of the seal cover to the cosmetic cover. Additionally, glue or epoxy can be used along the points of attachment to further improve engagement of the seal cover to the cosmetic cover. 
         [0028]    The inner portion is a membrane made of a flexible material, such as rubber or elastic, and has a circular O-ring opening that can engage a pyramid adaptor or foot plate or shank or pylon of a prosthetic foot system, creating a substantially watertight connection between the inner portion and the prosthetic foot system. In some embodiments, a collar adaptor can be placed on the prosthetic foot system that has a groove to receive the circular opening of the inner portion of the seal cover. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0029]      FIG. 1  is a partial side, top and front profile view of one embodiment of an overmould attachment coupled to a prosthetic foot. 
           [0030]      FIG. 2  is a partial side, top and front profile view of the prosthetic foot in  FIG. 1  that can be coupled to an overmould attachment and an overmould attachment that can be coupled to a prosthetic foot, with the prosthetic foot and the overmould separated. 
           [0031]      FIG. 3  is a front profile view of the overmould attachment coupled to the prosthetic foot of  FIG. 1 . 
           [0032]      FIG. 4  is a top plan view of the overmould attachment coupled to the prosthetic foot of  FIG. 1 . 
           [0033]      FIG. 5  is a bottom plan view of the overmould attachment coupled to the prosthetic foot of  FIG. 1 . 
           [0034]      FIG. 6  is a partial side, top and front profile view of another embodiment of an overmould attachment coupled to a prosthetic foot. 
           [0035]      FIG. 7  is a partial side, top and front profile view of the prosthetic foot in  FIG. 6  that can be coupled to an overmould attachment and an overmould attachment that can be coupled to a prosthetic foot, with the prosthetic foot and the overmould separated. 
           [0036]      FIG. 8  is a side profile view of the overmould attachment coupled to the prosthetic foot of  FIG. 6 . 
           [0037]      FIG. 9  is a top plan view of the overmould attachment coupled to the prosthetic foot of  FIG. 6 . 
           [0038]      FIG. 10  is a partial side, top and front profile view of yet another embodiment of an overmould attachment coupled to a prosthetic foot. 
           [0039]      FIG. 11  is a partial side, top and front profile view of the prosthetic foot of  FIG. 10  that can be coupled to an overmould attachment and an overmould attachment that can be coupled to a prosthetic foot, with the prosthetic foot and the overmould separated. 
           [0040]      FIG. 12  is a top plan view of the overmould attachment coupled to the prosthetic foot of  FIG. 10 . 
           [0041]      FIG. 13  is a bottom plan view of the overmould attachment coupled to the prosthetic foot of  FIG. 10 . 
           [0042]      FIG. 14  is a partial side, top and front profile view of one embodiment of a toe attachment coupled to a prosthetic foot plate. 
           [0043]      FIG. 15  is a partial side, top and front profile view of the prosthetic foot plate of  FIG. 14  that can be coupled to a toe attachment and a toe attachment that can be coupled to a prosthetic foot plate, with the foot plate and the toe attachment separated. 
           [0044]      FIG. 16  is a top plan view of one embodiment of the toe attachment in  FIG. 15 . 
           [0045]      FIG. 17  is a partial rear, side, and top profile view of the toe attachment in  FIG. 15 , showing one embodiment of a cavity that can receive a prosthetic foot plate. 
           [0046]      FIG. 18  is a partial rear, side, and bottom profile view of the toe attachment of  FIG. 15 , showing one embodiment of a cavity that can receive a prosthetic foot plate. 
           [0047]      FIG. 19  is a rear profile view of the toe attachment of  FIG. 15 , showing one embodiment of a cavity that can receive a prosthetic foot plate. 
           [0048]      FIG. 20  is a side profile view of the toe attachment of  FIG. 15 . 
           [0049]      FIG. 21  is a partial side, top and front profile view of one embodiment of a seal cover for a prosthetic foot. 
           [0050]      FIG. 22  is a top plan view of the seal cover of  FIG. 21 . 
           [0051]      FIG. 23  is a bottom plan view of the seal cover of  FIG. 21 . 
           [0052]      FIG. 24  is a side profile view of the seal cover of  FIG. 21 . 
           [0053]      FIG. 25A  is a cross-sectional view of the seal cover of  FIG. 21 , as viewed along plane  25 - 25  in  FIG. 22 . 
           [0054]      FIG. 25B  is a cross-sectional view of one embodiment of the seal cover of  FIG. 21  engaged with a cosmetic cover and a prosthetic foot system. 
           [0055]      FIG. 26  is a partial side, top and front profile view of another embodiment of a seal cover for a prosthetic foot. 
           [0056]      FIG. 27  is a top plan view of the seal cover of  FIG. 26 . 
           [0057]      FIG. 28  is a bottom plan view of the seal cover of  FIG. 26 . 
           [0058]      FIG. 29  is a side profile view of the seal cover of  FIG. 26 . 
           [0059]      FIG. 30  is a cross-sectional view the seal cover of  FIG. 26 , as viewed along plane  30 - 30  in  FIG. 27 . 
           [0060]      FIG. 31  is a partial side, top and front profile view of one embodiment of a collar adaptor. 
           [0061]      FIG. 32  is a partial side, top and front profile view of one embodiment of a seal cover for a prosthetic foot. 
           [0062]      FIG. 33  is a top plan view of the seal cover of  FIG. 32 . 
           [0063]      FIG. 34  is a bottom plan view of the seal cover of  FIG. 32 . 
           [0064]      FIG. 35  is a side profile view of the seal cover of  FIG. 32 . 
           [0065]      FIG. 36  is a cross-sectional view of the seal cover of  FIG. 32 , as viewed along plane  36 - 36  in  FIG. 33 . 
           [0066]      FIG. 37  is a cross-sectional view of one embodiment of the seal cover of  FIG. 32  engaged with a cosmetic cover and a prosthetic foot system. 
       
    
    
     DETAILED DESCRIPTION 
       [0067]      FIGS. 1-5  illustrate one embodiment of an overmould attachment  10  coupleable to a foot plate  40  of a prosthetic foot  100 . The foot plate  40  generally can have a toe end  42  and an ankle end  44 , as well as a toe surface or edge  46 , an ankle surface or edge  48 , and medial and lateral side surfaces or edges  50  extending from the toe surface  46  to the ankle surface  48 . In one embodiment, the medial and/or lateral side surfaces or edges  50  extend generally linearly (e.g., do not curve outward in a transverse direction to the longitudinal axis of the foot  100 ), or the foot plate  40  is generally planar, between the toe end  42  and the ankle end  44  along at least a portion of their length. In another embodiment, the medial and or lateral side surfaces or edges  50  extend in a generally curved manner (e.g., curved in the medial-lateral direction and/or curved in the anterior-posterior direction) along at least a portion of their length between the toe end  42  and the ankle end  44 . The foot plate  40  can also have a top surface  52  and a bottom surface  54  opposite the top surface  52 . In some embodiments, the overmould attachment  10  is coupled to at least the toe surface  46  of the foot plate  40  of the prosthetic foot  100 . In one embodiment, the overmould attachment  10  can be removably coupled to the foot plate  40  of the prosthetic foot  100 . In some embodiments, as seen in  FIG. 1 , the overmould attachment  10  is coupled to the toe surface  46  and all along the entire length of the side surfaces  50  of the foot plate  40 . In some embodiments, as shown in  FIGS. 1 ,  3  and  4 , at the ankle surface  48  of the foot plate  40 , the overmould attachment  10  has portions  12  that extend at least partially over the ankle surface  48  of the foot plate  40 . In some embodiments, the portions  12  of the overmould attachment  10  that extend at least partially over the ankle surface  48  help to couple the overmould attachment  10  to the foot plate  40 . In some embodiments, the overmould attachment  10  extends at least partially over the top surface  52  of the foot plate and at least partially over the bottom surface  54  of the foot plate. In some embodiments, the overmould attachment  10  extends at least partially over the top surface  52  of the foot plate. In some embodiments, the overmould attachment  10  extends at least partially over the bottom surface  54  of the foot plate. In some embodiments, the prosthetic foot  100  can have a heel plate  70  disposed below (e.g., coupled to) the bottom surface  54  of the foot plate  40 , extending away from the toe end  42 . In one embodiment, the overmould attachment  10  is not coupled to the heel plate  70 . In some embodiments, the overmould attachment  10  does not contact the heel plate  70 . 
         [0068]    In some embodiments, the foot plate  40  has a lengthwise split  56 , beginning at the toe end  42  of the foot plate and extending at least part of the length of the foot plate  40 , that divides the foot plate  40 , resulting in a medial portion  58  and a lateral portion  60 . In some embodiments, the lengthwise split  56  does not span the entire length of the foot plate  40 , resulting in an undivided foot plate at the ankle end  44  of the foot plate  40 . In some embodiments, the overmould attachment  10  will have a corresponding split  14  at the toe end  42 . The splits  56  and  14  in the foot plate  40  and the overmould attachment  10  allow the medial and lateral portions  58  and  60  to flex at least somewhat independently, improving functional properties of the prosthetic foot during rollover or during use on different surfaces (e.g., on uneven terrain). 
         [0069]    In one embodiment, as shown in  FIG. 4 , the overmould attachment  10  advantageously changes the shape of the foot plate  40 . In some embodiments, the overmould attachment  10  changes the width of the foot plate  40 . In some embodiments, the overmould attachment  10  changes the length of the foot plate  40 . In some embodiments, the overmould attachment  10  advantageously changes the shape of the foot plate  40  to make it more like the shape of a natural human foot (e.g., to include a sandal toe slot). In some embodiments, the overmould attachment  10  advantageously changes the shape of the foot plate  40  to improve stability characteristics of the prosthetic foot  100 . In some embodiments, the overmould attachment  10  advantageously changes the shape of the prosthetic foot  100  to improve functional characteristics of the prosthetic foot  100  during rollover. In some embodiments, the altered shape of the foot plate  40  allows the prosthetic foot  100  to be used with a shoe or other footwear without needing a cosmetic cover over. 
         [0070]    In one embodiment, the overmould attachment  10  shown in  FIGS. 1-5  removably couples to a foot plate  40  of a prosthetic foot  100 . In some embodiments, the overmould attachment  10  is coupled or removably coupled to the foot plate  40  using at least one clip mechanism. In some embodiments, the overmould attachment  10  is coupled or removably coupled to the foot plate  40  using a series of clips. In other embodiments, the overmould attachment  10  is coupled or removably coupled to the foot plate  40  using glue or epoxy. In other embodiments, the overmould attachment  10  is coupled or removably coupled to the foot plate  40  using magnetic force. In other embodiments, the overmould attachment  10  is coupled to the foot plate  40  using a series of complementary magnets located at corresponding locations of the overmould attachment  10  and the foot plate  40 . In still other embodiments, the overmould attachment  10  is coupled to the foot plate  40  using elastic properties of at least one part of the overmould attachment  10 . In some embodiments, the overmould attachment  10  is coupled to the foot plate  40  using any method of coupling known in the art. In some embodiments, the overmould attachment  10  is coupled to the foot plate  40  using any combination of any of the aforementioned coupling mechanisms. 
         [0071]    In some embodiments, the overmould attachment  10  is made of a polymer or plastic-like material or a compressible material. In some embodiments, the overmould attachment  10  is the same stiffness as the foot plate  40 . In some embodiments, the overmould attachment  10  is cheaper and easier to manufacture than the foot plate  40 . In some embodiments, the overmould attachment  10  protects the foot plate  40  of the prosthetic foot  100  from damage due to everyday wear and tear. 
         [0072]      FIGS. 6-9  illustrate another embodiment of an overmould attachment  210  coupleable to a foot plate  240  of a prosthetic foot  200 . The foot plate  240  generally can have a toe end  242  and an ankle end  244 , as well as a toe surface or edge  246 , an ankle surface or edge  248 , and medial and lateral side surfaces or edges  250  extending from the toe surface  246  to the ankle surface  248 . In one embodiment, the medial and/or lateral side surfaces or edges  250  extend generally linearly between the toe end  242  and the ankle end  244  along at least a portion of their length. In another embodiment, the medial and or lateral side surfaces or edges  250  extend in a generally curved manner along at least a portion of their length between the toe end  242  and the ankle end  244 . The foot plate  240  can also have a top surface  252  and a bottom surface  254  opposite the top surface  252 . In this embodiment, the overmould attachment  210  is coupled to the toe surface  246  of the foot plate  240  and along the side surfaces  250  of the foot plate  240  until about the portion  262  of the foot plate  240  where the foot plate  240  curves. In some embodiments, the overmould attachment  210  would extend along the side surfaces  250  of the foot plate  240  past the curved portion  262 , with the overmould attachment  210  curving to match the curve of the side surfaces  250 . In other embodiments, the overmould attachment would extend along the side surfaces  250  of the foot plate and stop before the curved portion  262 . In some embodiments, the overmould attachment  210  extends at least partially over the top surface  252  of the foot plate  240  and at least partially over the bottom surface  254  of the foot plate  240 . In some embodiments, the overmould attachment  210  extends at least partially over the top surface  252  of the foot plate  240 . In some embodiments, the overmould attachment  210  extends at least partially over the bottom surface  254  of the foot plate  240 . In some embodiments, the prosthetic foot  200  can have a heel plate  270  disposed below (e.g., coupled to) the bottom surface  254  of the foot plate  240 , extending away from the toe end  242 . In one embodiment, the overmould attachment  10  is not coupled to the heel plate  270 . In some embodiments, the overmould attachment  10  does not contact the heel plate  270 . 
         [0073]    In some embodiments, the foot plate  240  has a lengthwise split  256 , beginning at the toe end  242  of the foot plate and extending at least part of the length of the foot plate  240 , that divides the foot plate  240 , resulting in a medial portion  258  and a lateral portion  260 . In some embodiments, the lengthwise split  256  does not span the entire length of the foot plate, resulting in an undivided foot plate at the ankle end  244  of the foot plate  240 . In some embodiments, the attachment  210  will have a corresponding split  214  at the toe end  242 . The splits  256  and  214  in the foot plate  240  and the overmould attachment  210  allow the medial and lateral portions  258  and  260  to flex at least somewhat independently, improving functional properties of the prosthetic foot during rollover and to accommodate use of the foot on different terrain. 
         [0074]    In one embodiment, as seen in  FIG. 9 , the overmould attachment  210  advantageously changes the shape of the foot plate  240 . In some embodiments, the overmould attachment  210  changes the width of the foot plate  240 . In some embodiments, the overmould attachment  210  changes the length of the foot plate  240 . In some embodiments, the overmould attachment  210  advantageously changes the shape (e.g., contour) of the foot plate  240  to make it more like the shape of a natural human foot (e.g., to include a sandal toe slot). In some embodiments, the overmould attachment  210  advantageously changes the shape of the foot plate  240  to improve stability characteristics of the prosthetic foot  200  (e.g., by making the foot wider). In some embodiments, the overmould attachment  210  advantageously changes the shape of the foot plate  240  to improve functional characteristics of the prosthetic foot  200  during rollover. In some embodiments, the altered shape of the foot plate  240  allows the prosthetic foot  200  to be used with a shoe or other footwear without needing a cosmetic cover over. 
         [0075]    In one embodiment, the overmould attachment  210  shown in  FIGS. 6-9  can be removably coupled to a foot plate  240  of a prosthetic foot  200 . In some embodiments, the overmould attachment  210  is coupled or removably coupled to the foot plate  240  using at least one clip mechanism. In some embodiments, the overmould attachment  210  is coupled or removably coupled to the foot plate  240  using a series of clips. In other embodiments, the overmould attachment  210  is coupled or removably coupled to the foot plate  240  using glue or epoxy. In other embodiments, the overmould attachment  210  is coupled or removably coupled to the foot plate  240  using magnetic force. In other embodiments, the overmould attachment  210  is coupled to the foot plate  240  using a series of complementary magnets located at corresponding locations of the overmould attachment  210  and the foot plate  240 . In still other embodiments, the overmould attachment  210  is coupled to the foot plate  240  using elastic properties of at least one part of the overmould attachment  210 . In some embodiments, the overmould attachment  210  is coupled to the foot plate  240  using any method of coupling known in the art. In some embodiments, the overmould attachment  210  is coupled to the foot plate  240  using any combination of any of the aforementioned coupling mechanisms. 
         [0076]    In some embodiments, the overmould attachment  210  is made of a polymer or plastic-like material or a compressible material. In some embodiments, the overmould attachment  210  is the same stiffness as the foot plate  240 . In some embodiments, the overmould attachment  210  is cheaper and easier to manufacture than the foot plate  240 . In some embodiments, the overmould attachment  210  protects the foot plate  240  of the prosthetic foot  200  from damage due to everyday wear and tear. 
         [0077]      FIGS. 10-13  illustrate another embodiment of an overmould attachment  310  coupleable to a foot plate  340  of a prosthetic foot  300 . The foot plate  340  generally can have a toe end  342  and an ankle end  344 , as well as a toe surface  346 , an ankle surface  348 , and medial and lateral side surfaces  350  extending from the toe surface  346  to the ankle surface  348 . In one embodiment, the medial and/or lateral side surfaces or edges  350  extend generally linearly between the toe end  342  and the ankle end  344  along at least a portion of their length. In another embodiment, the medial and or lateral side surfaces or edges  350  extend in a generally curved manner along at least a portion of their length between the toe end  342  and the ankle end  344 . The foot plate  340  can have a top surface  352  and a bottom surface  354  opposite the top surface  352 . Like the embodiments shown in  FIGS. 1-5  and  FIGS. 6-9 , the embodiment of an overmould attachment  310  shown in  FIGS. 10-13  is coupled or removably coupled to the toe surface  346  of foot plate  340  and along the side surfaces  350  of the foot plate  340  of a prosthetic foot  300 . In one embodiment, the overmould attachment  310  is coupled or removably coupled along the entire side surfaces  350  of the foot plate  340 . In some embodiments, as shown in  FIGS. 10 and 12 , at the ankle surface  346  of the foot plate  340 , the overmould attachment  310  has portions  312  that extend at least partially over the ankle surface  348  of the foot plate  340 . In some embodiments, the portions  312  of the overmould attachment  310  that extend at least partially over the ankle surface  348  help to couple the overmould attachment  310  to the foot plate  340 . In some embodiments, the overmould attachment  310  extends at least partially over the top surface  352  of the foot plate  340  and at least partially over the bottom surface  354  of the foot plate  340 . In some embodiments, the overmould attachment  310  extends at least partially over the top surface  352  of the foot plate  340 . In some embodiments, the overmould attachment  310  extends at least partially over the bottom surface  354  of the foot plate  340 . In some embodiments, the prosthetic foot  300  can have a heel plate  370 , connected to the bottom surface  354  of the foot plate  340 , extending away from the toe end  342 . In one embodiment, the overmould attachment  10  is not coupled to the heel plate  370 . In some embodiments, the overmould attachment  10  does not contact the heel plate  370 . 
         [0078]    In some embodiments, the foot plate  340  has a lengthwise split,  356  beginning at the toe end  342  of the foot plate and extending at least part of the length of the foot plate  340 , that divides the foot plate  340 , resulting in a medial portion  358  and a lateral portion  360 . In some embodiments, the lengthwise split  356  does not span the entire length of the foot plate, resulting in an undivided foot plate at the ankle end  344  of the foot plate  340 . In some embodiments, the attachment  310  can have a corresponding split (not shown) at the toe end  342 . The splits in the foot plate and the attachment can allow the medial and lateral portions  358  and  360  to flex at least somewhat independently, improving functional properties of the prosthetic foot during rollover and when used on uneven terrain. 
         [0079]    In one embodiment, as seen in  FIGS. 10 ,  12  and  13 , the overmould attachment  310  is a single piece that advantageously changes the shape of the foot plate  340 . In some embodiments, including the embodiment shown in  FIGS. 10 ,  12  and  13 , the overmould attachment  310  includes a portion  314  that extends the length of the toe of the foot plate  340 , wherein the extended portion  314  includes a cutout section  316  that divides the extended portion  314  into a medial lobe  318  and a lateral lobe  320 . In some embodiments, the cutout or slot  316  is generally U-shaped and sized to receive a strap of a sandal, flip-flop or similar footwear (e.g., the slot  316  provides a sandal toe feature). In some embodiments, both the medial lobe  318  and lateral lobe  320  can have a width. In some embodiments, the lateral lobe  320  has a width greater than the width of the medial lobe  318 . In other embodiments, the medial lobe  318  has a width greater than the width of the lateral lobe  320 . In still other embodiments, the medial lobe  318  and lateral lobe  320  have equal or approximately equal widths (e.g., the slot  316  can be located generally midway along the width of the foot  300 ). In some embodiments, the respective widths of the medial lobe  318  and lateral lobe  320  result in a stiffness for the medial lobe  318  and lateral lobe  320 , wherein varying the widths of the medial lobe  318  and lateral lobe  320  results in varying the stiffness of the medial lobe  318  and lateral lobe  320 . In some embodiments, the characteristics of the medial lobe  318  and lateral lobe  320  result in improved rollover during use of the prosthetic foot  300  coupled to the overmould attachment  310 . 
         [0080]    In some embodiments, this extended portion  314  including a cutout  316  allows the user to use the prosthetic foot  300  in combination with sandal-type shoes or other types of footwear without also having to use a cosmetic foot cover. In some embodiments, the overmould attachment  310  changes the width of the foot plate  340 . In some embodiments, the overmould attachment  310  changes the length of the foot plate  340 . In some embodiments, the overmould attachment  310  advantageously changes the shape of the foot plate  340  to make it more like the shape of a natural human foot (e.g., to include a sandal toe slot). In some embodiments, the overmould attachment  310  advantageously changes the shape of the foot plate  340  to improve stability characteristics of the prosthetic foot  300 . In some embodiments, the overmould attachment  310  advantageously changes the shape of the foot plate  340  to improve functional characteristics of the prosthetic foot  300  during rollover. 
         [0081]    In one embodiment, the overmould attachment  310  shown in  FIGS. 10-13  can be removably coupled to a foot plate  340  of a prosthetic foot  300 . In some embodiments, the overmould attachment  310  is coupled or removably coupled to the foot plate  340  using at least one clip mechanism. In some embodiments, the overmould attachment  310  is coupled or removably coupled to the foot plate  340  using a series of clips. In other embodiments, the overmould attachment  310  is coupled or removably coupled to the foot plate  340  using glue or epoxy. In other embodiments, the overmould attachment  310  is coupled or removably coupled to the foot plate  340  using magnetic force. In other embodiments, the overmould attachment  310  is coupled to the foot plate  340  using a series of complementary magnets located at corresponding locations of the overmould attachment  310  and foot plate  340 . In still other embodiments, the overmould attachment  310  is coupled to the foot plate  340  using elastic properties of at least one part of the overmould attachment  310 . In some embodiments, the overmould attachment  310  is coupled to the foot plate  340  using any method of coupling known in the art. In some embodiments, the overmould attachment  310  is coupled to the foot plate  340  using any combination of any of the aforementioned coupling mechanisms. 
         [0082]    In some embodiments, the overmould attachment  310  is made of a polymer or plastic-like material or a compressible material. In some embodiments, the overmould attachment  310  is the same stiffness as the foot plate  340 . In some embodiments, the overmould attachment  310  is cheaper and easier to manufacture than the foot plate  340 . In some embodiments, the overmould attachment  310  protects the foot plate  340  of the prosthetic foot  300  from damage due to everyday wear and tear. 
         [0083]      FIGS. 14-20  illustrate one embodiment of a toe attachment  410  coupleable to a foot plate  440  of a prosthetic foot  400 . The foot plate  440  can be generally planar (e.g., generally flat) and have a toe end  442  and an ankle end  444 , as well as a toe surface  446 , an ankle surface  448 , and medial and lateral side surfaces  450  extending from the toe surface  446  to the ankle surface  448 . In the embodiment shown in  FIG. 14 , the toe attachment  410  is coupled to the toe end  442  of a foot plate  440  for a prosthetic foot  400 . In some embodiments, the toe attachment  410  is removably coupleable to the foot plate  440 . In some embodiments, the toe attachment  410  can have a cavity  412  on a rear surface  414 , shown in  FIGS. 17-19 , wherein the cavity can receive the toe end  442  of a foot plate  440  such that the toe attachment  410  is coupled or removably coupled to the toe end  442  of the foot plate  440 . In some embodiments, the toe attachment  410  is coupled or removably coupled to a foot plate  440  using at least one clip. In some embodiments, the toe attachment  410  is coupled or removably coupled to a foot plate  440  using glue or epoxy. In still another embodiment, the toe attachment  410  is coupled or removably coupled to a foot plate  440  using magnetic force. In some embodiments, the toe attachment  410  is coupled to the foot plate  440  using any method of coupling known in the art. In some embodiments, the toe attachment  410  is coupled to the foot plate  440  using any combination of any of the aforementioned coupling mechanisms. 
         [0084]    In some embodiments, the toe attachment  410  can have a top surface  418  and a bottom surface  420 . In some embodiments, the top surface  418  and the bottom surface  420  are substantially parallel. In some embodiments, as shown in  FIG. 20 , the top surface  418  and the bottom surface  420  have a slight upward curve as they move away from rear surface  414 . In some embodiments, the toe attachment  410  can have a cutout or slot  416  that extends from the top surface  418  to the bottom surface  420  that divides the toe attachment  410  into a medial lobe  422  and a lateral lobe  424 . In some embodiments, the cutout or slot  416  is generally U-shaped and sized to receive a strap of a sandal, flip-flop or similar footwear (e.g., the slot  416  can provide a sandal toe feature). In some embodiments, the cutout  416  resulting in a medial lobe  422  and lateral lobe  424  gives the toe attachment  410  a more anatomical appearance. In some embodiments, the more anatomical appearance is a “sandal toe” appearance. In some embodiments, both the medial lobe  422  and lateral lobe  424  can have a width. In some embodiments, the medial lobe  422  has a width greater than the width of the lateral lobe  424 . In other embodiments, the lateral lobe  424  has a width greater than the width of the medial lobe  422 . In still other embodiments, the medial lobe  422  and lateral lobe  424  have equal or approximately equal widths (e.g., the slot  416  can be located generally midway along the width of the foot  400 ). In some embodiments, the respective widths of the medial lobe  422  and lateral lobe  424  result in a stiffness for the medial lobe  422  and lateral lobe  424 , wherein varying the widths of the medial lobe  422  and lateral lobe  424  results in varying the stiffness of the medial lobe  422  and lateral lobe  424 . In some embodiments, this stiffness of the medial lobe  422  and lateral lobe  424  improve the functional characteristics of the prosthetic foot  400  during rollover. Additionally, when coupled to a foot plate  440 , the toe attachment  410  facilitates use of the prosthetic foot  400  with sandal-type shoes or other footwear without the use a cosmesis. 
         [0085]      FIGS. 21-25  illustrate one embodiment of a seal cover  500  for a cosmetic cover (e.g., cosmesis) for a prosthetic foot. In some embodiments, the seal cover  500  generally has the shape of the cross-section of a human ankle. In some embodiments, the seal cover  500  generally has the shape of the ankle opening of a cosmetic cover for a prosthetic foot. The seal cover  500  generally can have an inner portion  512  and an outer portion  514 . In some embodiments, the inner portion  512  and the outer portion  514  are made of different materials. In some embodiments, the inner portion  512  is a membrane made of a flexible material. In some embodiments, the flexible material is elastic. In some embodiments, the outer portion  514  is a frame made of plastic (e.g., a hard plastic). However, other suitable materials can be used. In still another embodiment, the inner portion  512  and the outer portion  514  can be made of the same material. 
         [0086]    The inner portion  512  can have a circular opening  516  that can fit over (e.g., engage) a portion of a prosthetic foot  542  or prosthetic component (e.g., pylon)  544  or  546 , resulting in a substantially watertight connection  560  between the inner portion  512  and the prosthetic foot  542  or prosthetic foot component  544  or  546 . In some embodiments, the circular opening  516  can have an O-ring  518 . In some embodiments, the opening  516  of the inner portion  512  fits over (e.g., engages) an adaptor of a prosthetic foot. In some embodiments, the opening  516  of the inner portion  512  fits around (e.g., engages) a shank of a prosthetic foot. In some embodiments, the opening  516  of the inner portion  512  engages a collar adaptor located on a prosthetic foot (e.g., the collar adaptor  700  shown in  FIG. 31  and described below), the collar adaptor having a groove that can receive the O-ring  518  of the opening  516 . In some embodiments, when the opening  516  is engaged with the corresponding portion of a prosthetic foot  544 , the connection  560  between the inner portion  512  and the prosthetic foot is substantially watertight. 
         [0087]    In some embodiments, the outer portion  514  can have a top surface  520 , a bottom surface  522 , and an edge  524  defining a perimeter  526 . The edge  524  and the top surface  520  form a corner  528  around the perimeter  526  of the outer portion  514 , and, in some embodiments, this corner  528  is rounded off. In some embodiments, the top surface  520  is substantially flat. In some embodiments, the perimeter  526  has generally the shape of the ankle opening of a cosmetic cover  540  for a prosthetic foot  542 . The outer portion  514  can engage a cosmetic cover  540  for a prosthetic foot  542 . In some embodiments, the outer portion  514  can removably engage a cosmetic cover  540  for a prosthetic foot  542 . In some embodiments, the bottom surface  522  can engage a cosmetic cover  540  for a prosthetic foot  542 . In some embodiments, the bottom surface  522  has a series of protrusions  530  that can removably engage complementary cavities on the cosmetic cover  540 . In some embodiments, the bottom surface  522  can engage a cosmetic cover  540  such that the connection  550  between the outer portion  514  and the cosmetic cover is substantially watertight. In some embodiments, glue or epoxy can be used at the connection  550  between the outer portion  514  and the cosmetic cover to improve the seal of the connection  550 . 
         [0088]    In some embodiments, the series of protrusions  530  is generally located around the perimeter  526  of the outer portion  514 . In some embodiments, the series of protrusions  530  generally located around the perimeter  526  of the outer portion  514  are offset in from the edge  524  of the outer portion  514  such that when the outer portion  514  is engaged with a cosmetic cover, the edge  524  of the outer portion  514  is substantially flush with an outer surface of the cosmetic cover  540 . In some embodiments, the protrusions  530  mate with corresponding recess openings or slots on a surface of the opening of the cosmetic cover  540 . In some embodiments, the protrusions  530  are equally spaced around the perimeter  526  of the outer portion  514 . In some embodiments, the spacing between the protrusions  530  can vary. In some embodiments, the series of protrusions  530  can have any number of protrusions. In some embodiments, the number of protrusions  530  is between 1 and 30. In some embodiments, there are about 15-20 protrusions in the series of protrusions  530 . In some embodiments, there are 18 protrusions in the series of protrusions  530 . 
         [0089]    In some embodiments, a protrusion  530  can have a height, a length, a width, and a first and second cross-sectional faces  532 , the cross-sectional faces  532  having a shape comprising a body  534  having a rectangular cross-section and a head  536  having an inverted triangular cross-section. The head  536  is located on the portion of the protrusion  530  farthest away from the bottom surface  522 . In some embodiments, the triangular portion of the first and second cross-sectional faces  532  is angled inwards towards the opposite cross-sectional face. In some embodiments, the triangular head  536  has a width greater than the width of the rectangular body  534  such that the width of the triangle extends beyond the width of the rectangle. The height of a protrusion  530  is defined by the distance from the bottom surface  522  to the tip of the head  534  of the protrusion  530 . In some embodiments, all protrusions  530  have equal heights. In some embodiments, the protrusions  530  have varying heights. In some embodiments, the height of a single protrusion  530  can be between about 0.1 cm to about 10 cm. In some embodiments, the height of a single protrusion  530  can be between about 0.1 cm to about 3 cm. The length of a protrusion  530  is defined by the distance from the first cross-sectional face to the second cross-sectional face. The length of a single protrusion  530  can vary between about 0.1 cm to about 10 cm. In some embodiments, the length of a single protrusion  530  can be between about 0.1 cm to about 3 cm. In some embodiments, all protrusions  530  have generally equal lengths. In some embodiments, protrusions  530  can have varying lengths. In some embodiments, the protrusions  530  are generally straight between the first and second cross-sectional faces  532 . In some embodiments, the protrusions  530  curve between the first and second cross-sectional faces  532 . In some embodiments, the protrusions  530  curve between the first and second cross-sectional faces  532  such that they run generally parallel to the perimeter  526  of the outer portion  514 . 
         [0090]      FIG. 25B  illustrates one embodiment of a seal cover  500  engaged with a cosmetic cover  540  and fitted around (e.g., engaged with) a prosthetic foot system. In some embodiments, the outer portion  514  of the seal cover  500  is engaged with the cosmetic cover  540  such that the connection  550  between the outer portion  514  and the cosmetic cover  540  is substantially watertight. In some embodiments, the inner portion  512  of the seal cover  500  fits around (e.g., engages) a component  542 ,  544  or  546  of a prosthetic foot system such that the connection  560  between the inner portion  512  and the prosthetic foot system is substantially watertight. In some embodiments, the inner portion  512  of the seal cover  500  fits around (e.g., engages) a collar adaptor (e.g., the collar adaptor  700  shown in  FIG. 31  and described below) located on or around a component of a prosthetic foot system, wherein the collar adaptor can have a groove to receive the inner portion  512 . In some embodiments, the inner portion  512  can have varying shapes or designs. 
         [0091]      FIGS. 26-30  illustrate one embodiment of a seal cover  600  for a cosmetic cover for a prosthetic foot. In some embodiments, the seal cover  600  generally has the shape of the cross-section of a human ankle. In some embodiments, the seal cover  600  generally has the shape of the ankle opening of a cosmetic cover for a prosthetic foot. The seal cover  600  generally can have an inner portion  612  and an outer portion  614 . In some embodiments, the inner portion  612  and the outer portion  614  are made of different materials. In some embodiments, the inner portion  612  is a membrane made of a flexible material. In some embodiments, the flexible material is elastic. In some embodiments, the outer portion  614  is a frame made of plastic (e.g., hard plastic). However, other suitable materials can be used. In still another embodiment, the inner portion  612  and the outer portion  614  can be made of the same material. 
         [0092]    The inner portion  612  can have a circular opening  616  that can fit over (e.g., engage) a portion of a prosthetic foot or prosthetic component (e.g., pylon), resulting in a substantially watertight connection between the inner portion  612  and the prosthetic foot. In some embodiments, the circular opening  616  can have an O-ring  618 . In some embodiments, the opening  616  of the inner portion  612  fits over (e.g., engages) an adaptor of a prosthetic foot. In some embodiments, the opening  616  of the inner portion  612  fits around (e.g., engages) a shank of a prosthetic foot. In some embodiments, the opening  616  of the inner portion  612  engages a collar adaptor located on a prosthetic foot (e.g., the collar adaptor  700  shown in  FIG. 31  and described below), the collar adaptor having a groove that can receive the O-ring  618  of the opening  616 . In some embodiments, when the opening  616  is engaged with the corresponding portion of a prosthetic foot, the connection between the inner portion  612  and the prosthetic foot is substantially watertight. 
         [0093]    In some embodiments, the outer portion  614  can have a top surface  620 , a bottom surface  622 , and an edge  624  defining a perimeter  626 . The edge  624  and the top surface  620  form a corner  628  around the perimeter  626  of the outer portion  614 , and, in some embodiments, this corner  628  is rounded off. In some embodiments, the top surface  620  is substantially flat. In some embodiments, the perimeter  626  has generally the shape of the ankle opening of a cosmetic cover for a prosthetic foot. The outer portion  614  can engage a cosmetic cover for a prosthetic foot. In some embodiments, the outer portion  614  can removably engage a cosmetic cover for a prosthetic foot. In some embodiments, the bottom surface  622  can engage a cosmetic cover for a prosthetic foot. In some embodiments the bottom surface  622  can have a first lip  630  and a second lip  640 , wherein the first lip  630  is closer to the perimeter  626  of the outer portion  614  than the second lip  640 , and whereby the two lips  630  and  640  define a cavity or slot  650  between them. In some embodiments, the first and second lips  630  and  640  can removably engage a cosmetic cover for a prosthetic foot. In some embodiments, the first and second lips  630  and  640  are located generally near the perimeter  626  of the bottom surface  622 . In some embodiments, the first lip  630  is a continuous projection that forms a single continuous ridge that runs generally parallel to the perimeter  626  of the outer portion  614 . In some embodiments, the second lip  640  is a continuous projection that forms a single continuous ridge that runs generally parallel to the perimeter  626  of the outer portion  614 . In some embodiments, the first and second lips  630  and  640  run generally parallel to the perimeter  626  of the outer portion  614 . In some embodiments, the continuous first and second lips  630  and  640  define a cavity, slot or channel  650  that runs substantially parallel to the perimeter  626  of the outer portion  614  and that can removably receive at least a portion of a cosmetic cover for a prosthetic foot. 
         [0094]    In some embodiments, the first lip  630  has an outer surface  632  and an inner surface  634 . In some embodiments, the outer surface  632  of the first lip  630  is generally perpendicular to the top surface  620  of the outer portion  614 . In some embodiments, the outer surface  632  is contiguous with the edge  624  of the outer portion  614  such that it is effectively a continuation of the edge  624  of the outer portion  614 . In some embodiments, the inner surface  634  of the first lip  630  is at an angle relative to the outer surface  632  such that the first lip  630  becomes narrower as it moves away from the bottom surface  622  of the outer portion  614 . 
         [0095]    In some embodiments, the second lip  640  has an outer surface  642  and an inner surface  644 . In some embodiments, the outer surface  642  of the second lip  640  is generally perpendicular to the top surface  620  of the outer portion  614 . In some embodiments, the outer surface  642  of the second lip  640  is generally parallel to the outer surface  632  of the first lip  630 . In some embodiments, the inner surface  644  of the second lip  640  has a semi-circle or round protrusion  646  on the portion of the surface  644  that is farthest away from the bottom surface  622  of the outer portion  614 . In some embodiments, the portion of the inner surface  644  closest to the bottom surface  622  of the outer portion  614  is at an angle relative to the outer surface  642  of the second lip  640 . In some embodiments, the semi-circle or round protrusion  646  on the inner surface  644  of the second lip  640  can removably engage a corresponding feature on a cosmetic cover for a prosthetic foot. In some embodiments, the second lip  640  can deflect towards first lip  630  during the process of engaging the seal cover to the cosmetic cover, and then return to the original un-deflected position to engage the cosmetic cover. In some embodiments, the connection between the outer portion  614  and the cosmetic cover is substantially watertight. In some embodiments, glue or epoxy may be used at the point of attachment to achieve a greater degree of waterproofing. 
         [0096]      FIGS. 32-37  illustrate one embodiment of a seal cover  800  for a cosmetic cover for a prosthetic foot. In some embodiments, the seal cover  800  generally has the shape of the cross-section of a human ankle. In some embodiments, the seal cover  800  generally has the shape of the ankle opening of a cosmetic cover for a prosthetic foot. The seal cover  800  generally can have an inner portion  812  and an outer portion  814 . In some embodiments, the inner portion  812  and the outer portion  814  are made of different materials. In some embodiments, the inner portion  812  is a membrane made of a flexible material. In some embodiments, the flexible material is elastic. In some embodiments, the outer portion  814  is a frame made of plastic (e.g., hard plastic). In still another embodiment, the inner portion  812  and the outer portion  814  can be made of the same material. 
         [0097]    However, other suitable materials can be used. The inner portion  812  can have a circular opening  816  that can fit over (e.g., engage) a portion of a prosthetic foot or prosthetic component (e.g., pylon), resulting in a substantially watertight connection between the inner portion  812  and the prosthetic foot. In some embodiments, the circular opening  816  can have an O-ring  818 . In some embodiments, the opening  816  of the inner portion  812  fits over (e.g., engages) an adaptor of a prosthetic foot. In some embodiments, the opening  816  of the inner portion  812  fits around (e.g., engages) a shank of a prosthetic foot. In some embodiments, the opening  816  of the inner portion  812  engages a collar adaptor located on a prosthetic foot (e.g., the collar adaptor  700  shown in  FIG. 31  and described below), the collar adaptor having a groove that can receive the O-ring  818  of the opening  816 . In some embodiments, the inner portion  812  can have excess material (e.g., be oversized) such that when the opening  816  is engaged with a portion of a prosthetic foot or prosthetic component, the inner portion  816  is not taut or rigid. In some embodiments, the excess material (or oversized configuration) of the inner portion  812  can define one or more folds  870  in the inner portion  812 . In some embodiments, this excess material that defines one or more folds  870  allows for greater flexibility of the inner portion  812  when it is engaged with a prosthetic foot or prosthetic component. In some embodiments, when the opening  816  is engaged with the corresponding portion of a prosthetic foot, the connection between the inner portion  812  and the prosthetic foot is substantially watertight. 
         [0098]    In some embodiments, the outer portion  814  can have a top surface  820 , a bottom surface  822 , and an edge  824  defining a perimeter  826 . The edge  824  and the top surface  820  form a corner  828  around the perimeter  826  of the outer portion  814 , and, in some embodiments, this corner  828  is rounded off. In some embodiments, the top surface  820  is substantially flat, though in other embodiments it can have other suitable configurations (e.g., curved, concave, convex). In some embodiments, the perimeter  826  has generally the shape of the ankle opening of a cosmetic cover  840  for a prosthetic foot  842 . The outer portion  814  can engage a cosmetic cover  840  for a prosthetic foot  842 . In some embodiments, the outer portion  814  can removably engage a cosmetic cover  840  for a prosthetic foot  842 . In some embodiments, the bottom surface  822  can engage a cosmetic cover  840  for a prosthetic foot  842 . In some embodiments, the outer portion  814  can engage a cosmetic cover  840  for a prosthetic foot  842  in the manner described and shown with respect to outer portion  514  and cosmetic cover  540  in  FIGS. 21-25 , via a series of protrusions  830  on the bottom surface  822  that can removably engage one or more complementary cavities, recesses or slots on the cosmetic cover  840 . In some embodiments, the series of protrusions  830  on seal cover  800  is substantially similar to the series of protrusions  530  on seal cover  500  as described above for  FIGS. 21-25 . In some embodiments, the outer portion  814  can fit over or engage a cosmetic cover  840  for a prosthetic foot  842  in the manner described and shown with respect to outer portion  614  and in  FIGS. 26-30 , using a first and second lip to engage the cosmetic cover  840  (not shown for the embodiment of the seal cover  800 ). In some embodiments, the first and second lips (not shown) are substantially similar to the first lip  630  and second lip  640  on seal cover  600  described above for  FIGS. 26-30 . 
         [0099]      FIG. 37  illustrates one embodiment of a seal cover  800  engaged with a cosmetic cover  840  and fitted around (e.g., engaged with) a prosthetic foot system. In some embodiments, the outer portion  814  of the seal cover  800  is engaged with the cosmetic cover  840  such that the connection  850  between the outer portion  814  and the cosmetic cover  840  is substantially watertight. In some embodiments, the inner portion  812  of the seal cover  800  fits around (e.g., engages) a component, for example  842  or  844 , of a prosthetic foot system such that the connection  860  between the inner portion  812  and the prosthetic foot system is substantially watertight. In some embodiments, the inner portion  812  of the seal cover  800  fits around (e.g., engages) a collar adaptor (e.g., the collar adaptor  700  shown in  FIG. 31  and described below) located on or around a component of a prosthetic foot system, wherein the collar adaptor can have a groove to receive the inner portion  812 . In some embodiments, the inner portion  812  has excess material (or is oversized) resulting in at least one fold  870 , wherein the at least one fold  870  allows for greater flexibility in the inner portion  812  and the connection  860  between the inner portion  812  and the prosthetic foot system. In some embodiments, the inner portion  812  can have varying shapes or designs, including one or more folds  870 . 
         [0100]      FIG. 31  illustrates one embodiment of a collar adaptor  700  for a prosthetic foot system that can receive (e.g., engage) a seal cover, such as the seal cover  500  or seal cover  600 . In some embodiments, the collar adaptor  700  can have a groove  710  that can receive (e.g., engage) at least a portion of a seal cover. In some embodiments, the groove  710  can receive (e.g., engage) an inner portion of a seal cover. In some embodiments, the groove  710  can receive (e.g., engage) an O-ring of an inner portion of a seal cover. In some embodiments, the groove  710  is circumferential. In some embodiments, the groove  710  can have a semi-circular cross-section. In some embodiments, the collar adaptor  700  can receive (e.g., engage) at least a portion of a seal cover such that the connection between the collar adaptor  700  and the seal cover is substantially watertight. 
         [0101]    In some embodiments, the collar adaptor  700  can fit on, over, or around (e.g., engage) a portion or component of a prosthetic foot system, such as a proximal portion of a foot plate of the prosthetic foot or a pylon attached to the prosthetic foot. In some embodiments, the collar adaptor  700  can fit on, over, or around (e.g., engage) a portion or component of a prosthetic foot system via an aperture in the collar adaptor  700 . In some embodiments, the aperture can have a substantially rectangular shape. In some embodiments, the aperture can have a substantially circular shape. In some embodiments, the aperture can have a shape such that the collar adaptor  700  can fit on, over, or around a portion or component of a prosthetic foot system (e.g., the shape of the aperture generally coincides with a cross-sectional shape of the component to which the adaptor is coupled). In some embodiments, the collar adaptor  700  can fit on, over, or around (e.g., engage) the shank, pylon, pyramid adaptor, foot plate, or any other portion or component of a prosthetic foot system. In some embodiments, the collar adaptor  700  can fit on, over, or around (e.g., engage) at least a portion or component of a prosthetic foot system such that the connection between the collar adaptor  700  and the at least a portion of the prosthetic foot system is substantially watertight. In some embodiments, the collar adaptor  700  can fit on, over, or around (e.g., engage) a portion or component of a prosthetic foot system and can removably receive (e.g., engage) at least a portion (i.e., an inner portion or O-ring) of a seal cover resulting in a substantially watertight connection between the prosthetic foot system and the seal cover. In some embodiments, the collar adaptor  700  can be integrated into (e.g., manufactured as a part of) at least a portion of a prosthetic foot system, such that the portion of the prosthetic foot system can have a groove  710  that can receive (e.g., engage) a portion of a seal cover. 
         [0102]    Although this disclosure has been described in the context of certain embodiments and examples, it will be understood by those skilled in the art that the disclosure extends beyond the specifically disclosed embodiments to other alternative embodiments and/or uses and obvious modifications and equivalents thereof. In addition, while several variations of the embodiments of the disclosure have been shown and described in detail, other modifications, which are within the scope of this disclosure, will be readily apparent to those of skill in the art. It is also contemplated that various combinations or sub-combinations of the specific features and aspects of the embodiments may be made and still fall within the scope of the disclosure. For example, features described above in connection with one embodiment can be used with a different embodiment described herein and the combination still fall within the scope of the disclosure. It should be understood that various features and aspects of the disclosed embodiments can be combined with, or substituted for, one another in order to form varying modes of the embodiments of the disclosure. Thus, it is intended that the scope of the disclosure herein should not be limited by the particular embodiments described above. 
         [0103]    Features, materials, characteristics, or groups described in conjunction with a particular aspect, embodiment, or example are to be understood to be applicable to any other aspect, embodiment or example described in this section or elsewhere in this specification unless incompatible therewith. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and/or all of the steps of any method or process so disclosed, may be combined in any combination, except combinations where at least some of such features and/or steps are mutually exclusive. The protection is not restricted to the details of any foregoing embodiments. The protection extends to any novel one, or any novel combination, of the features disclosed in this specification (including any accompanying claims, abstract and drawings), or to any novel one, or any novel combination, of the steps of any method or process so disclosed. 
         [0104]    Furthermore, certain features that are described in this disclosure in the context of separate implementations can also be implemented in combination in a single implementation. Conversely, various features that are described in the context of a single implementation can also be implemented in multiple implementations separately or in any suitable subcombination. Moreover, although features may be described above as acting in certain combinations, one or more features from a claimed combination can, in some cases, be excised from the combination, and the combination may be claimed as a subcombination or variation of a subcombination. 
         [0105]    Moreover, while operations may be depicted in the drawings or described in the specification in a particular order, such operations need not be performed in the particular order shown or in sequential order, or that all operations be performed, to achieve desirable results. Other operations that are not depicted or described can be incorporated in the example methods and processes. For example, one or more additional operations can be performed before, after, simultaneously, or between any of the described operations. Further, the operations may be rearranged or reordered in other implementations. Those skilled in the art will appreciate that in some embodiments, the actual steps taken in the processes illustrated and/or disclosed may differ from those shown in the figures. Depending on the embodiment, certain of the steps described above may be removed, others may be added. Furthermore, the features and attributes of the specific embodiments disclosed above may be combined in different ways to form additional embodiments, all of which fall within the scope of the present disclosure. Also, the separation of various system components in the implementations described above should not be understood as requiring such separation in all implementations, and it should be understood that the described components and systems can generally be integrated together in a single product or packaged into multiple products. 
         [0106]    For purposes of this disclosure, certain aspects, advantages, and novel features are described herein. Not necessarily all such advantages may be achieved in accordance with any particular embodiment. Thus, for example, those skilled in the art will recognize that the disclosure may be embodied or carried out in a manner that achieves one advantage or a group of advantages as taught herein without necessarily achieving other advantages as may be taught or suggested herein. 
         [0107]    Conditional language, such as “can,” “could,” “might,” or “may,” unless specifically stated otherwise, or otherwise understood within the context as used, is generally intended to convey that certain embodiments include, while other embodiments do not include, certain features, elements, and/or steps. Thus, such conditional language is not generally intended to imply that features, elements, and/or steps are in any way required for one or more embodiments or that one or more embodiments necessarily include logic for deciding, with or without user input or prompting, whether these features, elements, and/or steps are included or are to be performed in any particular embodiment. 
         [0108]    Conjunctive language such as the phrase “at least one of X, Y, and Z,” unless specifically stated otherwise, is otherwise understood with the context as used in general to convey that an item, term, etc. may be either X, Y, or Z. Thus, such conjunctive language is not generally intended to imply that certain embodiments require the presence of at least one of X, at least one of Y, and at least one of Z. 
         [0109]    Language of degree used herein, such as the terms “approximately,” “about,” “generally,” and “substantially” as used herein represent a value, amount, or characteristic close to the stated value, amount, or characteristic that still performs a desired function or achieves a desired result. For example, the terms “approximately”, “about”, “generally,” and “substantially” may refer to an amount that is within less than 10% of, within less than 5% of, within less than 1% of, within less than 0.1% of, and within less than 0.01% of the stated amount. As another example, in certain embodiments, the terms “generally parallel” and “substantially parallel” refer to a value, amount, or characteristic that departs from exactly parallel by less than or equal to 15 degrees, 10 degrees, 5 degrees, 3 degrees, 1 degree, 0.1 degree, or otherwise. 
         [0110]    The scope of the present disclosure is not intended to be limited by the specific disclosures of preferred embodiments in this section or elsewhere in this specification, and may be defined by claims as presented in this section or elsewhere in this specification or as presented in the future. The language of the claims is to be interpreted broadly based on the language employed in the claims and not limited to the examples described in the present specification or during the prosecution of the application, which examples are to be construed as non-exclusive.