Abstract: A needle-free connection device include a casing, a connection base, a slide element and a resilient valve. The casing includes a first hollow tube having a first liquid transmission channel. The connection base is connected to the casing. The resilient valve includes a second hollow tube and a plug connected thereto, wherein the second hollow tube has a second liquid transmission channel, a third liquid transmission channel is formed between the second hollow tube and the plug, and a fourth liquid transmission channel is formed between the connection base and the plug. The first to the fourth liquid transmission channel are intercommunicated with each other. The connection base includes a third hollow tube, and a fourth liquid transmission channel is formed between the plug and the third hollow tube. The needle-free connection device provides a liquid transmission path sequentially passing through the first to the fourth liquid transmission channel.

Abstract: A needle-free connection device include a casing, a connection base, a slide element and a resilient valve. The casing includes a first hollow tube having a first liquid transmission channel. The connection base is connected to the casing. The resilient valve includes a second hollow tube and a plug connected thereto, wherein the second hollow tube has a second liquid transmission channel, a third liquid transmission channel is formed between the second hollow tube and the plug, and a fourth liquid transmission channel is formed between the connection base and the plug. The first to the fourth liquid transmission channel are intercommunicated with each other. The connection base includes a third hollow tube, and a fourth liquid transmission channel is formed between the plug and the third hollow tube. The needle-free connection device provides a liquid transmission path sequentially passing through the first to the fourth liquid transmission channel.

Abstract: A needleless connector comprises a lid, a containing seat, and a flexible valve. One end of the lid is connected to one end of the containing seat, the interior of the lid and the interior of the containing seat form a space. The flexible valve is disposed in the space, and the flexible valve has a closed end and an opening end. The closed end is disposed in the inserting hole of the lid, and the opening end toward the closed end is formed inward with a groove. The flexible valve is defined in sequence as a head portion, a shoulder portion, a bending portion, and a supporting portion from the closed end to the opening end. The outer diameter of the head portion is smaller than the outer diameter of the bending portion. A shoulder portion is connected between the head portion and the bending portion.

Abstract: A needleless connector module, including: a flow guiding member having a flow guiding channel connecting to a upper portion of the flow guiding member, the upper portion including an ultrasonic welding portion thereon; an elastic valve; and a sleeve tube having an inner annular bottom surface formed on an inner wall of a base portion of the sleeve tube, an limiting portion of annular wall being defined by the inner wall of the base portion, the sleeve tube is sleeved on the elastic valve and assembled with the flow guiding member to allow the inner annular bottom surface to contact with the ultrasonic welding portion and let the limiting portion of the annular wall annularly cover a base side portion of the flow guiding member, so as to improve success of ultrasonic welding between the ultrasonic welding portion and the limiting portion of annular wall.