A modular deformable suture needle for a minimally invasive surgery, characterized by comprising a short needle, a flexible deformation needle body composed of parallel units with position differences, and a heat supply unit or a power supply unit, wherein
- the flexible deformation needle body composed of parallel units with position differences comprises a needle body sleeve, I deformation control units, and more than one line feeding unit, in which, I≥1, and if the serial number of the deformation control unit is i, 1≤i≤I;
- the line feeding unit comprises a suture line and a suture line sleeve, wherein the suture line sleeve wraps the suture line;
- each deformation control unit comprises a memory metal wire, a conductive metal wire, aerogel particles and a film sleeve, wherein the tail end of the memory metal wire is sequentially connected to the head end of the conductive metal wire to form a deformation control unit core body, the film sleeve is wrapped outside the deformation control unit core body, and the aerogel particles are filled between the film sleeve and the deformation control unit core body;
- when the modular deformable suture needle for the minimally invasive surgery comprises the power supply unit, the deformation control unit further comprises an electrical loop metal wire, and a tail end of the electrical loop metal wire is connected to a head end of the memory metal wire;
- the needle body sleeve is wrapped outside the deformation control units and the line feeding unit, the electrical loop metal wire is located inside the needle body sleeve and outside the film sleeve, and a head end of the electrical loop metal wire extends to a tail end of the needle body sleeve;
- the arrangement of the deformation control units in the needle body sleeve satisfies:
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- wherein L,(i) represents a length of the ith deformation control unit extending into a minimally invasive surgical wound, having a value equal to a sum of a length of the memory metal wire of the ith deformation control unit extending into the minimally invasive surgical wound and a length of the conductive metal wire of the ith deformation control unit extending into the minimally invasive surgical wound;
- L,(i,1) represents the length of the memory metal wire of the ith deformation control unit extending into the minimally invasive surgical wound;
- s,(i),(i+1) represents a distance between a tail end of the memory metal wire in the ith deformation control unit and a head end of the memory metal wire in the (i+1)th deformation control unit;
- a head end of the needle body sleeve is connected to an outer edge of the head end of the suture line sleeve in a fixed sealing manner, parts of the deformation control units extending into the wound are isolated from organ tissues in the body of a surgical subject by the needle body sleeve, and a line feeding unit extending into the wound is also isolated from organ tissues in the body of a surgical subject by the needle body sleeve;
- a tail end of the short needle is connected to the suture line;
- the heat supply unit is connected to the tail end of the conductive metal wire and used to provide a heat source;
- the power supply unit is connected to the tail end of the conductive metal wire and the head end of the electrical loop metal wire and used to provide a power source;
- the tail end of the memory metal wire is electrically connected to the head end of the conductive metal wire to form the deformation control unit core body of the single deformation control unit, a head end of the deformation control unit core body is the head end of the memory metal wire, and a tail end of the deformation control unit core body is the tail end of the conductive metal wire;
- the tail end of the electrical loop metal wire is electrically connected to the head end of the memory metal wire, and located outside the film sleeve;
- the film sleeve has a length greater than a length of the deformation control unit core body wrapped inside the film sleeve;
- an inner diameter of the film sleeve is greater than an outer diameter of the deformation control unit core body;
- the film sleeve is made of an insulating, flame-retardant material;
- an elastic module of the memory metal wire is not lower than that of the conductive metal wire;
- the memory metal wire is made of a memory metal that is elastically deformed as a temperature changes or a current changes, and a radian of the memory metal wire is elastically deformed as the temperature changes or the current changes;
- the aerogel particles are made of a low-density solid heat-insulating material;
- the head end of the needle body sleeve extends into the minimally invasive surgical wound during surgery, and the length of the needle body sleeve satisfies that the tail end of the needle body sleeve is always located outside the minimally invasive surgical wound during surgery;
- the electrical loop metal wire is located inside the needle body sleeve and outside the suture line sleeve;
- and
- the lengths of the memory metal wire, the conductive metal wire and the electrical loop metal wire satisfy that the tail end of the conductive metal wire and the head end of the electrical loop metal wire are located outside the minimally invasive surgical wound during surgery.