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A needle-less syringe adapter has a tube, a resilient valve, a piercing member and an injection member. The tube has a body has a cavity and an outlet hole. The resilient valve is mounted in the cavity and has a chamber, a top slit and a bottom slit. The piercing conduit is mounted in the chamber, i

A needle-less syringe adapter has a tube, a resilient valve, a piercing member and an injection member. The tube has a body has a cavity and an outlet hole. The resilient valve is mounted in the cavity and has a chamber, a top slit and a bottom slit. The piercing conduit is mounted in the chamber, is driven to move when the resilient valve is compressed, selectively extends out through the top and bottom slits and has a through hole defined through the piercing conduit. The injection member is mounted on the tube and is selectively sealed by the resilient valve. The needle-less syringe adapter has excellent hermetical characteristics to prevent air infiltration and backflow of bloody and liquid medicine in a patient's blood vessel.

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1. A needle-less syringe adapter, comprising: a tube having a body having a top end;a bottom end;a cavity defined in the top end and having an inner surface, a top inlet opening and a bottom partition opposite to the top inlet opening;an outlet hole defined through the bottom partition of the cavity

1. A needle-less syringe adapter, comprising: a tube having a body having a top end;a bottom end;a cavity defined in the top end and having an inner surface, a top inlet opening and a bottom partition opposite to the top inlet opening;an outlet hole defined through the bottom partition of the cavity, communicating with the cavity and having an inner surface; andan outlet channel defined in the body and communicating with the outlet hole;a resilient valve mounted in the cavity of the tube and having a top, a bottom and a chamber defined in the resilient valve and having a top slit defined through the top of the resilient valve and selectively closing to seal the chamber or opening to communicate with the chamber, wherein a default configuration of the top slit is closed; anda bottom slit defined through the bottom of the resilient valve and selectively closing to seal the chamber or opening to communicate with the chamber , wherein a default configuration of the bottom slit is closed;a piercing conduit formed as a unitary piece and tapered from an intermediate respectively toward top and bottom ends thereof so that an outer surface of the piercing conduit has slope, a top end of the piercing conduit selectively extending out through the top slit, a bottom end of the piercing conduit selectively extending out through the bottom slit, wherein the piercing conduit has a through hole defined longitudinally through the piercing conduit from the top end to the bottom end and selectively communicating with the outlet hole andthe through hole has a top opening defined on the top end and facing upward instead of facing radially inward, and a bottom opening defined on the bottom end and facing downward instead of facing radially inward, wherein the top opening is entirely revealed out of the resilient valve when the top end of the piercing conduit extends out through the top slit, and the bottom opening is entirely revealed out of the resilient valve when the bottom end of the piercing conduit extends out through the bottom slit; andan injection member mounted on the top end of the body of the tube and having a top end, a bottom end and an internal space defined therein,wherein when the needle-less syringe adapter is not used, the top and bottom slits of the resilient valve are closed to seal the injection member and the outlet hole of the tube and the resilient valve encloses the piercing conduit, anda ventilation hole is defined between the tube and injection member so that air in the internal space of the injection member and the cavity of the tube is discharged through the ventilation hole. 2. The needle-less syringe adapter as claimed in claim 1, wherein the internal space of the injection member accommodates the resilient valve and defines a top injection opening selectively closed by the top of the resilient valve, and a bottom opening. 3. The needle-less syringe adapter as claimed in claim 2, wherein the outlet hole of the bottom partition of the tube further has a curved concave surface formed on the inner surface adjacent to the cavity ; andthe bottom end of the piercing conduit has a curved convex surface corresponding to and selectively contacting the curved concave surface of the outlet hole of the tube hermetically. 4. The needle-less syringe adapter as claimed in claim 2, wherein the resilient valve further has a guide formed on and protruding radially from the resilient valve, the guide slidably contacting the inner surface of the cavity of the tube and driving the piercing conduit to move synchronously. 5. The needle-less syringe adapter as claimed in claim 4, wherein the guide of the resilient valve further has a mounting element formed in the chamber; andthe piercing conduit further has a mounting member formed on the piercing conduit and mounted on the mounting element of the guide of the resilient valve. 6. The needle-less syringe adapter as claimed in claim 5, wherein the mounting element is a mounting recess and the mounting member is a mounting protrusion mounted securely in the mounting recess. 7. The needle-less syringe adapter as claimed in claim 1, wherein the resilient valve has a top deforming section being compressible and having at least one wrinkled portion formed radially on the top deforming section. 8. The needle-less syringe adapter as claimed in claim 7, wherein the resilient valve further has a bottom deforming section being compressible and having at least one wrinkled portion formed radially on the bottom deforming section. 9. The needle-less syringe adapter as claimed in claim 1, wherein the resilient valve further has a pad formed on the bottom of the resilient valve; andthe bottom end of the injection member abuts the pad of the resilient valve. 10. The needle-less syringe adapter as claimed in claim 1, wherein the cavity of the tube further has a rib formed on and protruding from the inner surface of the cavity; andthe injection member further has a groove defined radially in the injection member and engaged with the rib. 11. The needle-less syringe adapter as claimed in claim 1, wherein the body of the tube further has at least one positioning notch defined in the inner surface of the cavity adjacent to the top inlet opening; andthe injection member further has a cap formed on and protruding radially from the injection member, mounted on the top end of the body of the tube and having at least one positioning projection engaged respectively with the at least one positioning notch of the tube. 12. A needle-less syringe adapter, comprising: a tube having a body having a top end;a bottom end;a cavity defined in the top end and having an inner surface, a top inlet opening and a bottom partition opposite to the top inlet opening;an outlet hole defined through the bottom partition of the cavity, communicating with the cavity and having an inner surface; andan outlet channel defined in the body and communicating with the outlet hole;a resilient valve mounted in the cavity of the tube and having a top, a bottom and a chamber defined in the resilient valve and having a top slit defined through the top of the resilient valve and selectively closing to seal the chamber or opening to communicate with the chamber , wherein a default configuration of the top slit is closed; anda bottom slit defined through the bottom of the resilient valve and selectively closing to seal the chamber or opening to communicate with the chamber , wherein a default configuration of the bottom slit is closed;a piercing conduit formed as a unitary one piece and tapered from an intermediate respectively toward top and bottom ends thereof so that an outer surface of the piercing conduit has slope, a top end of the piercing conduit selectively extending out through the top slit, a bottom end of the piercing conduit selectively extending out through the bottom slit, wherein the piercing conduit has a through hole defined longitudinally through the piercing conduit from the top end to the bottom end and selectively communicating with the outlet hole andthe through hole has a top opening defined on the top end and facing upward instead of facing radially inward, and a bottom opening defined on the bottom end and facing downward instead of facing radially inward, wherein the top opening is entirely revealed out of the resilient valve when the top end of the piercing conduit extends out through the top slit, and the bottom opening is entirely revealed out of the resilient valve when the bottom end of the piercing conduit extends out through the bottom slit; andan injection member mounted on the top end of the body of the tube and having a top end, a bottom end and an internal space defined therein;wherein when the needle-less syringe adapter is not used, the top and bottom slits of the resilient valve are closed to seal the injection member and the outlet hole of the tube and the resilient valve encloses the piercing conduit, anda ventilation hole is defined between the tube and injection member so that air in the internal space of the injection member and the cavity of the tube is discharged through the ventilation hole; andwherein the resilient valve is assembled from a top half and a bottom half, each of the top and bottom halves has a mounting flange formed radially on each of the top and bottom halves, and the piercing conduit has a mounting protrusion formed radially on the piercing conduit and having two opposite mounting slots defined in the mounting protrusion and engaged respectively with the mounting flanges.