Expulsion liner for prosthetic or orthotic devices and associated methods
The expulsion liner is for use with a prosthetic device to be secured to a residual limb. The expulsion liner includes an elongated elastomeric tube having a closed distal end and an open proximal end, and defining an interior space configured to receive the residual limb. A one-way valve is positioned within the closed distal end and provides controlled fluid communication between the interior space and an external environment. The one-way valve may be configured to allow the weight of a user, via the residual limb, to expel moisture and air from the interior space out to the external environment.
1. An expulsion liner for use with a prosthetic device to be secured to a residual limb, the expulsion liner comprising:
an elongated elastomeric tube formed of an elastomeric material having a closed distal end and an open proximal end, and defining an interior space configured to receive the residual limb, the closed distal end including a reinforcing feature comprising a localized increased stiffness area of the elastomeric material defined by a distal end thickness of the tube, the distal end thickness defining a channel extending through an entirety of the thickness between the interior space and an external environment; and
a one-way valve positioned solely within the thickness of the localized increased stiffness area in the elastomeric material of the closed distal end and providing controlled fluid communication between the interior space and the external environment, a portion of the channel extending between the one-way valve and an outer periphery of the tube;
wherein the one-way valve is centrally located at the bottom of the distal end of the liner.
2. The expulsion liner according to claim 1 wherein the one-way valve is configured to allow the weight of a user, via the residual limb, to expel moisture and air from the interior space out to the external environment.
3. The expulsion liner according to claim 1 wherein the one-way valve comprises a duckbill valve.
4. The expulsion liner according to claim 1 wherein the one-way valve has a cracking pressure of about 0.2 psi.
5. An expulsion liner for use with a prosthetic device to be secured to a residual limb, the expulsion liner comprising:
an elongated elastomeric tube formed of an elastomeric material having a closed distal end and an open proximal end, and defining an interior space configured to receive the residual limb. the closed distal end including a reinforcing feature comprising a localized increased stiffness area of the elastomeric material defined by a distal end thickness of the tube, the distal end thickness defining a channel extending through an entirety of the thickness between the interior space and an external environment; and
a duckbill valve solely positioned within the thickness of the localized increased stiffness area in the elastomeric material of the closed distal end configured to allow the weight of a user, via the residual limb, to expel moisture and air from the interior space out to the external environment, a portion of the channel extending between the one-way valve and an outer periphery of the tube;
wherein the duckbill valve is centrally located at the bottom of the distal end of the liner.
6. The expulsion liner according to claim 5 wherein the duckbill valve has a cracking pressure of about 0.2 psi.
7. A method of making an expulsion liner for use with a prosthetic device to be secured to a residual limb, the method comprising:
forming an elongated elastomeric tube formed of an elastomeric material having a closed distal end and an open proximal end, and defining an interior space configured to receive the residual limb, the closed distal end including a reinforcing feature comprising a localized increased stiffness area of the elastomeric material, defined by a distal end thickness of the tube;
forming a channel extending through an entirety of the distal end thickness of the tube between an inner periphery to an outer periphery open at an external environment; and
positioning a one-way valve solely within the localized increased stiffness area in the elastomeric material of the closed distal end and providing controlled fluid communication between the interior space and the external environment;
wherein the one-way valve is centrally located at the bottom of the distal end of the liner;
wherein a portion of the channel extends between the one-way valve and the outer periphery of the tube.
8. The method according to claim 7 wherein the one-way valve is configured to allow the weight of a user, via the residual limb, to expel moisture and air from the interior space out to the external environment.
9. The method according to claim 7 wherein the one-way valve comprises a duckbill valve.
10. The method according to claim 7 wherein the one-way valve has a cracking pressure of about 0.2 psi.
11. The expulsion liner according to claim 1 , wherein another portion of the channel extends between an inner periphery of the tube at the distal end to the one-way valve.
12. The expulsion liner according to claim 1 , wherein a thickness of the one-way valve is less than the distal end thickness.
13. The expulsion liner according to claim 1 , wherein the one-way valve is embedded within the distal end thickness and spaced away by a clearance from the outer periphery of the tube.
14. The expulsion liner according to claim 1 , wherein distal end thickness defines a chamber into which the one-way valve extends, the channel communicating the chamber to the outer periphery of the liner.
15. The expulsion liner according to claim 1 , wherein the distal end thickness defines a maximum thickness of the tube.