Prosthetic liner with perspiration elimination mechanism
Disclosed is a prosthetic elastomeric liner, which can be used without lanyards or straps, in which, upon ambulation, perspiration is voided simultaneously with the reestablishment of a vacuum-aided seal without a vacuum pump. The liner's distal tip comprises a buttress anchored sweat port containing a one way valve continuous with a channel passing through the buttress and liner from its inner surface to its outer surface. The sweat port is connected, optionally integrally, to a prosthetic pin which is inserted into a prosthetic limb.
1. A liner comprising:
a) an elastomeric liner body comprising an open proximal end and a closed distal end except for a centrally extending channel, said liner body defining an interior volume;
b) at least one symmetrical buttress element mounted centrally to said distal end of said liner body and having a cylindrical member extending away from said distal end; said cylindrical member defining a bore therethrough having an inlet end and an outlet end;
c) said channel in the distal end of the liner having an inlet in fluid communication with said interior volume of said liner body and an outlet in fluid communication with said inlet end of said bore of said cylindrical member;
d) a sweat port mounted in said outlet end of said bore of said cylindrical member of said buttress element and defining a passageway extending along a longitudinal axis therethrough in fluid communication with said channel, said sweat port having a one-way valve mounted in said passageway and adapted to provide one-way flow from said interior volume;
e) a pin having a longitudinal axis attached to said sweat port downstream of said one-way valve, said longitudinal axis of said pin being aligned with said longitudinal axis of said sweat port whereby said pin extends axially with respect to said liner body and is configured to be lockingly engaged by a prosthetic socket; and
f) a vent downstream of said one-way valve fluidly communicating said passageway to surrounding environment of said sweat port and/or said pin.
2. A liner as in claim 1 wherein said liner additionally comprises a fabric liner or pad which does not extend to the proximal end of the liner body.
3. A liner as in claim 2 wherein said fabric liner extends to no less than one inch from the proximal end of the liner body.
4. A liner as in claim 1 wherein a section of said at least one buttress element is completely embedded within the liner body.
5. A liner as in claim 1 wherein a section of said at least one buttress element is attached to the exterior of said distal end of said liner body.
6. A liner as in claim 1 wherein said one-way valve is a duckbill valve.
7. A liner as in claim 1 wherein said channel is a self-closable channel formed in said elastomeric liner body.
8. A liner as in claim 1 wherein said sweat port and said pin are integral.
9. A liner as in claim 8 wherein said vent comprises a vent port in said sweat port disposed between said one-way valve and said pin.
10. A liner as in claim 8 wherein said pin comprises the vent.
11. A liner as in claim 1 wherein the sweat port and pin are releasably attached.
12. A liner as in claim 11 wherein said vent comprises a vent port in said sweat port disposed between said one-way valve and said pin.
13. A liner as in claim 1 wherein the sweat port and pin are attached via a threaded connection.
14. A liner as in claim 13 wherein said vent comprises a vent port in said sweat port disposed between said one-way valve and said pin.