Abstract: An improved ureteral sheath, includes: an introducer sheath including a sheath tube and a sheath base arranged at a proximal end of the sheath tube, the sheath base is provided with a tube segment in communication with the sheath tube and a connecting part arranged at a distal end of the tube segment; the sheath tube is provided, from a proximal end to a distal end thereof, with a main body segment and a head segment arranged at a distal end of the main body segment, the main body segment is composed of a hard tube segment, and the head segment is composed of a deformable tube segment; and the tube segment extends outwards relative to a central axis thereof in a communication manner to form a negative pressure connecting tube, a tube wall of the negative pressure connecting tube is provided with vent groove.

Abstract: The present disclosure a pressure detection device, a sheath tube and a perfusion and suction system. The pressure detection device comprises a housing and a pressure detection assembly. the housing has a piezometric cavity and a mounting cavity, the piezometric cavity has an air inlet for communicating with a piezometric interface of the sheath tube and a vent hole for communicating with the outside, and a switch is arranged at the vent hole; and the pressure detection assembly is arranged in the mounting cavity and includes a gauge pressure sensor, a voltage regulating circuit, an operational amplifier circuit and a conversion circuit; the gauge pressure sensor, the voltage regulating circuit and the operational amplifier circuit are electrically connected with the conversion circuit, and the gauge pressure sensor is used for converting a pressure signal in the piezometric cavity into a voltage signal.

Abstract: The present disclosure provides a perfusion and suction system, the host controller thereof is configured to execute a constant pressure regulation method including the following steps. A pressure detection device collects the pressure in a cavity and transmits it to the host controller, the host controller adjusts perfusion and suction parameters according to the real-time monitored pressure value and the data change trend of the pressure value, so that the current pressure in the cavity is balanced at a pressure control value, thus realizing a balance state between perfusion and suction; the perfusion parameters include a perfusion flow gear, and the suction parameters include an opening threshold of a relief valve and a suction pressure threshold; the suction pressure threshold is a suction pressure threshold of the suction container preset by the host controller, and the on-off of the suction pump is controlled by setting the suction pressure threshold.

Abstract: The present invention provides an improved visual laryngeal mask comprising a snorkel, an end of the snorkel is provided with a fixing seat. The fixing seat is provided with an airbag, and the fixing seat has a recess which is provided with an airway opening. The inner wall of the snorkel longitudinally extends an imaging cavity and a cleaning channel. The imaging cavity has a built-in imaging device, and the imaging cavity and the cleaning channel protrude forward relative to the airway opening to form a stopper which prevents an epiglottis from blocking the imaging device.

Abstract: The present invention provides an improved visual laryngeal mask comprising a snorkel, an end of the snorkel is provided with a fixing seat. The fixing seat is provided with an airbag, and the fixing seat has a recess which is provided with an airway opening. The inner wall of the snorkel longitudinally extends an imaging cavity and a cleaning channel. The imaging cavity has a built-in imaging device, and the imaging cavity and the cleaning channel protrude forward relative to the airway opening to form a stopper which prevents an epiglottis from blocking the imaging device.