Vacuum suction structure of ankle joint and support barrel of artificial limb

摘要

A vacuum suction structure of ankle joint and support barrel of artificial limb is connected, to the top thereof, with an artificial limb and the support barrel and is connected, to the bottom thereof, with an artificial foot. An ankle pressure cylinder forms therein an air chamber receiving therein an air chamber piston that forms therein a hydraulic fluid compartment. A hydraulic fluid supplementing cylinder and a one-way hydraulic fluid cylinder are arranged at one side of the ankle pressure cylinder and are connected via a connection piping system to the hydraulic fluid compartment. The one-way hydraulic fluid cylinder receives therein a push rod and the hydraulic fluid cylinder piston. When the structure is put into operation to allow a user to step forwards, the ankle pressure cylinder can provide both functions of hydraulic cushioning and air pressure regulation.

主权项

1. A prosthetic attachment system including a vacuum suction structure, an ankle joint, a support barrel and an artificial limb, the vacuum suction structure comprising: an ankle pressure cylinder that forms therein an air chamber, the air chamber receiving therein a spring biasingly supporting an air chamber piston, the air chamber piston comprising a hydraulic fluid compartment formed therein and coupled to a positioning bar; a hydraulic fluid supplementing cylinder and a one-way hydraulic fluid cylinder arranged at one side of the ankle pressure cylinder, the hydraulic fluid supplementing cylinder receiving therein a spring biasingly supporting a hydraulic fluid supplementing piston that defines a hydraulic fluid supplementing compartment, the hydraulic fluid supplementing cylinder being provided atop with a hydraulic fluid inlet valve and a hydraulic fluid outlet valve; the one-way hydraulic fluid cylinder receiving therein a push rod to which a hydraulic fluid cylinder piston is fit to define, in upper and lower sides thereof, an upper hydraulic fluid compartment and a lower hydraulic fluid compartment; a connection piping system connecting to the ankle pressure cylinder, the hydraulic fluid supplementing cylinder, and the one-way hydraulic fluid cylinder, the connection piping system being filled with a hydraulic fluid and being provided with at least one one-way valve to constrain flowing direction of the hydraulic fluid; a one-way valve seat arranged at an opposite side of the ankle pressure cylinder, the one-way valve seat being provided, at a top thereof, with an air-drawing joint and being also provided, at a bottom thereof, with a bolt and receiving therein an air valve assembly, a second air chamber, and an airflow passage, the airflow passage connecting to the air chamber to allow air to flow to the air valve assembly, the bolt having a circumference around which a U-shaped sealing member is fit;
characterized in that through stepping forward, the push rod drives the hydraulic fluid cylinder piston to move vertically, compressing the hydraulic fluid to flow through the connection piping system into the hydraulic fluid compartment formed in the air chamber piston so as to drive the air chamber piston to move, whereby the air chamber piston causes, via the airflow passage, variation of density of air contained in the support barrel so that the ankle pressure cylinder achieves both hydraulic cushioning and air pressure regulation.