Abstract: An inflatable ankle brace may include an ankle brace, an inflating member, and a check valve member, and the check valve member has a check valve and a one-way piece. The ankle brace comprises at least an airbag having a valve port thereon, and the inflating member is adapted to inflate the airbag through the valve port. The inflating member has an air pump and an air tube, and a connector is connected between the air pump and the air tube. The air tube is connected to the valve port, and the connector has an air inlet and an air outlet, and the air inlet connects to the check valve member. The check valve has an elastic tube, and one end of the elastic tube comprises a duckbill first valve which is deformable to open or close, and the other end of the elastic tube is connected to a base.

Abstract: A backflow preventer for water filtering equipment, the water filtering equipment has a plurality of filtering units, the filtering units are connected among each other via at a plurality of connectors connected by at least one hose and connected to a water source via the at least one of the connectors, at least one of the connectors has a check valve set, and the check valve set has a check valve and an unidirectional valve. The check valve has an elastic tube with a duckbill valve at one end and is connected to a base at another end, and the base has a socket sleeved onto the elastic tube. The unidirectional valve has a first main portion with a larger diameter and a second main portion with a smaller diameter, the diameter of the second main portion corresponding to an inner diameter of the socket of the check valve.

Abstract: A heat exchanger has a plurality of metal plates, each metal plate having two contacting surfaces, at least one of the contacting surfaces having a fluid channel and abutting against another metal plate, at least two metal plates connected together with the contacting surfaces facing each other. High temperature is used to melt at least two metal plates together, so that the metal plates can be combined without additional locking or welding.

Abstract: A pulsed laser printing module for a contact lens, comprises a steel mold, a pulsed laser device and a forming case. The steel mold is configured for transferring pigment. The pulsed laser device is configured for transmitting ultrashort laser pulses having pulse time widths less than 10?9 seconds. The ultrashort laser pulses etch the surface of the steel mold to remove a coating of the steel mold to form an etched layer. The forming case has a lower member and an upper member. The lower member is a concavity, and an inner surface of the lower member is provided with a lower curved surface. The upper member is provided with a protrusion corresponding to the lower member, and an outer surface of the protrusion is provided with an upper curved surface corresponding to the lower curved surface. The protrusion is capable of being placed in a concavity of the lower member to form a gap between the lower curved surface and the upper curved surface.

Abstract: A pulsed laser printing module for a contact lens, comprises a steel mold, a pulsed laser device and a forming case. The steel mold is configured for transferring pigment. The pulsed laser device is configured for transmitting ultrashort laser pulses having pulse time widths less than 10?9 seconds. The ultrashort laser pulses etch the surface of the steel mold to remove a coating of the steel mold to form an etched layer. The forming case has a lower member and an upper member. The lower member is a concavity, and an inner surface of the lower member is provided with a lower curved surface. The upper member is provided with a protrusion corresponding to the lower member, and an outer surface of the protrusion is provided with an upper curved surface corresponding to the lower curved surface. The protrusion is capable of being placed in a concavity of the lower member to form a gap between the lower curved surface and the upper curved surface.

Abstract: A sealing ring has a circular ring with a circular outer edge and a circular inner edge. The circular ring further has a first curved surface and a second curved surface between the circular outer edge and the circular inner edge. The circular outer edge, the first curved surface and the second curved surface have curved cross-sectional shapes. The circular ring further has a circular recess on the circular inner edge. The circular ring also has a circular protrusion on the circular recess respectively adjacent to the first curved surface and the second curved surface.