Fig. 1

The structure of the new synovial biopsy device and Procedure of the Novel Synovial Biopsy Device for Joint Tissue Sampling. The novel synovial biopsy device for joint tissue sampling consists of the following key components: a Sleeve Needle (1), Sleeve Needle Core (2), Sampling Needle (3), Sampling Needle Core (4), Rebound Device (5), Slot (6), Sampling Port (7), and a Negative Pressure Connector Port (8). The device is designed to puncture into the joint cavity using the puncture sheath needle and the puncture inner core (a). After removing the puncture inner core, the sampling needle is inserted, and the firing device is pressed, placing the sampling needle in a ready-to-fire state (b). The tail of the biopsy needle tube is connected to a negative pressure device, which creates a vacuum inside the closed-end hollow section of the biopsy needle tube, ensuring that synovial tissue enters the groove of the sampling needle under the effect of negative pressure (c). Coordinating with the firing device of the biopsy outer sheath, the biopsy needle tube rapidly springs out, and the hooked end at the head of the biopsy needle tube cuts the synovial tissue (d)