Leaflet capture device and system, and assembling method

An assembling method for a valve leaflet capture device, applicable to a valve leaflet capture device that comprises a wire body and a proximal joint, wherein the wire body comprises a distal coil, a middle coil, and a proximal coil that are sequentially arranged, the proximal coil is arranged at a proximal end of the wire body, the distal coil is arranged at a distal end of the wire body, the proximal joint comprises a proximal joint body, a proximal clamping jaw, and a proximal clamping portion, and a material of the proximal joint is shape memory alloy material, the assembling method comprises:

• performing thermoforming treatment on the wire body, so that the wire body is formed into a spiral shape, and both a spiral inner diameter of the proximal coil and a spiral inner diameter of the distal coil are greater than a spiral inner diameter of the middle coil;
• performing thermoforming treatment on the proximal joint, so that the proximal clamping jaw of the proximal joint is in a close state;
• placing the proximal joint in ice water, so that the proximal clamping jaw is in an open state;
• placing a proximal end of the proximal coil inside the proximal clamping jaw, so that a shape memory alloy member in the proximal end of the proximal coil is placed inside the proximal joint body;
• taking out the proximal joint and the proximal coil from the ice water while maintaining a positional relationship between the proximal joint and the proximal coil in the ice water and keeping them at a normal temperature, so that the proximal clamping jaw returns to the close state and the proximal end of the proximal coil is clamped in the proximal clamping jaw;
• welding the shape memory alloy member to a proximal connector in a way that a proximal through-hole is in communication with the proximal end of the proximal coil;
• and
• sleeving a developing ring outside the proximal clamping jaw.