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A reduced pressure treatment apparatus includes a charging chamber storing a first pressure less than an ambient pressure and a regulated chamber storing a second pressure less than the ambient pressure. The first pressure is less than the second pressure. A conduit provides fluid communication betw

A reduced pressure treatment apparatus includes a charging chamber storing a first pressure less than an ambient pressure and a regulated chamber storing a second pressure less than the ambient pressure. The first pressure is less than the second pressure. A conduit provides fluid communication between the regulated chamber and the charging chamber. A regulator member is operably associated with the conduit to prevent fluid communication through the conduit when the second pressure is less than or equal to a desired therapy pressure and to allow fluid communication through the conduit when the second pressure exceeds the desired therapy pressure.

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1. A reduced pressure treatment apparatus comprising: a piston chamber having a closed end;a piston disposed within the piston chamber and being movable between an extended position and a compressed position;a charging chamber disposed between the piston and the closed end, the charging chamber havi

1. A reduced pressure treatment apparatus comprising: a piston chamber having a closed end;a piston disposed within the piston chamber and being movable between an extended position and a compressed position;a charging chamber disposed between the piston and the closed end, the charging chamber having a first volume when the piston is in the compressed position and a second volume when the piston is in the extended position, the first volume being less than the second volume;a biasing member between the piston and the closed end and adapted to bias the piston toward the extended position;a valve member allowing fluid to exit the charging chamber as the piston moves toward the compressed position and preventing fluid from entering the charging chamber as the piston moves toward the extended position;a regulated chamber fluidly coupled to an outlet port adapted for coupling to a delivery conduit;a passage between the regulated chamber and the charging chamber; anda regulator member to regulate fluid communication through the passage between the charging chamber and the regulated chamber;wherein the charging chamber stores a first pressure that is less than an ambient pressure;wherein the regulated chamber stores a second pressure that is less than the ambient pressure, the first pressure being less than the second pressure; andwherein the regulator member comprises a valve body and a regulator spring engaged with the valve body to bias the valve body against a differential between the ambient pressure and the second pressure. 2. The apparatus of claim 1, wherein: the regulator member closes the passage to prevent fluid communication through the passage when the pressure in the regulated chamber is less than or equal to a desired therapy pressure; andthe regulator member opens the passage to allow fluid communication through the passage when the pressure in the regulated chamber is greater than the desired therapy pressure. 3. The apparatus of claim 1, wherein the valve member is a seal that allows unidirectional fluid flow into the charging chamber. 4. The apparatus of claim 1, wherein the regulator member further comprises: a valve seat disposed adjacent the passage; anda valve body capable of engaging the valve seat to substantially reduce fluid communication through the passage. 5. The apparatus of claim 1 wherein: the first pressure is about −150 mm Hg; andthe second pressure is about −125 mm Hg. 6. The apparatus of claim 1, wherein the biasing member is a piston spring. 7. A reduced pressure treatment apparatus comprising: a charging chamber storing a first pressure less than an ambient pressure;a regulated chamber sealed from the ambient pressure and storing a second pressure less than the ambient pressure, the first pressure being less than the second pressure;an outlet port fluidly coupled to the regulated chamber, the outlet port adapted for fluid connection to a tissue site;a conduit providing fluid communication between the regulated chamber and the charging chamber; anda regulator member operably associated with the conduit to prevent fluid communication through the conduit when the second pressure is less than or equal to a desired therapy pressure and to allow fluid communication through the conduit when the second pressure exceeds the desired therapy pressure. 8. The apparatus of claim 7 further comprising an electric pump to deliver a reduced pressure to the charging chamber. 9. The apparatus of claim 7 further comprising a manually-actuated pump to deliver a reduced pressure to the charging chamber. 10. The apparatus of claim 7, wherein the regulator member further comprises: a valve seat disposed adjacent the conduit; anda valve body capable of engaging the valve seat to substantially reduce fluid communication through the conduit. 11. The apparatus of claim 10 further comprising: a spring operably associated with the valve body to urge the valve body toward an open position which allows fluid communication through the conduit. 12. The apparatus of claim 7, wherein: the first pressure is about −150 mm Hg; andthe second pressure is about −125 mm Hg. 13. The apparatus of claim 1, wherein: the valve body is adapted to engage a valve seat adjacent to the passage to substantially reduce fluid communication through the passage; andthe regulator spring is operably associated with the valve body to exert a biasing force on the valve body toward an open position, the valve body in the open position allowing fluid communication through the passage;wherein the valve body is positioned in a closed position when the pressure within the regulated chamber is less than or equal to a desired therapy pressure; andwherein the valve body is positioned in the open position when the pressure within the regulated chamber is greater than the desired therapy pressure. 14. The apparatus of claim 1, further comprising a conduit fluidly coupled to the outlet port. 15. The apparatus of claim 7, wherein the regulator member further comprises: a valve seat disposed adjacent the conduit;a valve body capable of engaging the valve seat to substantially reduce fluid communication through the conduit; anda regulator spring operably associated with the valve body to exert a biasing force on the valve body toward an open position, the valve body in the open position allowing fluid communication through the conduit;wherein the biasing force on the valve body is counteracted by a pressure within the regulated chamber;wherein the valve body is positioned in a closed position when the pressure within the regulated chamber is less than or equal to a desired therapy pressure; andwherein the valve body is positioned in the open position when the pressure within the regulated chamber is greater than the desired pressure therapy. 16. The apparatus of claim 7, further comprising a second conduit fluidly coupled to the outlet port.