Abstract: The present invention provides a valve material having synergistic anti-coagulation and anti-calcification functions and a preparation method therefor. The preparation method comprises the following steps: performing glutaraldehyde cross-linking treatment on an animal-derived biological valve material; immersing the treated valve material in a blocking solution containing an amine compound for 0.5-6 h, thereby blocking the remaining aldehyde groups after glutaraldehyde cross-linking; then placing the valve material into a reaction solution containing an anticoagulant and a cross-linking agent, and performing cross-linking treatment for 6-24 h at 4° C.-37° C.; and finally washing and obtaining the valve material, and storing the valve material in a mixed solvent of glutaraldehyde or isopropyl alcohol/glycerol. The method can effectively solve the problem of calcification and thrombosis caused by residual aldehyde groups in a valve material prepared by the existing method.

Abstract: A positioning and rescue device for an unmanned underwater vehicle, comprising a battery (1), a switch (2), a protective resistor (3), an electromagnetic relay (4), a master control chip (5), a GPS positioning system (6), an igniter (7), a partition (8), an air bag (9), a shell (10), and a rope (11). The battery (1), the switch (2), the protective resistor (3), the electromagnetic relay (4) and the master control chip (5) are sequentially connected by means of wires to form a series circuit, and the igniter (7) and the GPS positioning system (6) are separately connected to the master control chip (5) by means of wires; two normally open contacts of a control loop of the electromagnetic relay (4) are respectively connected to two ends of a general power supply (15).

Abstract: A radiofrequency ablation catheter includes an electrode ablation head (10), a Positive Temperature Coefficient (PTC) thermistor (20), and an inner conductor (30), where the electrode ablation head (10) is disposed at an end portion of the inner conductor (30), the PTC thermistor is disposed between the electrode ablation head (10) and the inner conductor (30), and the inner conductor (30) is connected to a cable plug component (40). The radiofrequency ablation catheter and a therapy device including the radiofrequency ablation catheter can precisely control the ablation temperature by means of PTC, such that upon coagulation of tissues, the ablation catheter is not adhered to the tissues, thus avoiding the risk of complications such as rebleeding.