Push Cable, Push System, Heat Treatment Method, and Method for Preparing Push Cable

A heat treatment method, comprising:

• providing a to-be-treated metal member, wherein the to-be-treated metal member is made of a shape memory alloy material, and the elastic energy storage efficiency of the to-be-treated metal member is η1;
• and
• placing the to-be-treated metal member in a heat treatment environment of 360° C. to 430° C. for 5 to 60 minutes, and then cooling the to-be-treated metal member to be less than or equal to 200° C. within 50 to 120 minutes to obtain a treated metal member,
• wherein the elastic energy storage efficiency of the treated metal member is η2, η1 and η2 are both greater than 0, and η2 is less than η1.

A push cable preparation method, comprising:

• preparing a first cable body and a second cable body, wherein the first cable body comprises one or more first metal wires, and the second cable body comprises one or more second metal wires;
• the elastic energy storage efficiency of the first metal wire is less than the elastic energy storage efficiency of the second metal wire;
• and in the environment of a human body temperature, when the first cable body is experiencing bending deformation from an initial form, the first cable body is not restored to the initial form without the assistance of an external force;
• and
• fixedly connecting a proximal end of the first cable body to a distal end of the second cable body to obtain a push cable.