A liquid transfer device for use with an infusion liquid container containing an infusion liquid and having an intravenous (IV) port for administering the infusion liquid, a discrete injection vial having a closed end vial tube containing a medicament, a tubular vial crown with a crown opening stopped by a non-punctured injection vial stopper, and an uppermost injection vial surface, and an infusion set including an infusion set IV spike for sealing insertion into a substitute IV port and a connector for administration purposes to a patient,
- the liquid transfer device comprising a trifurcated connector body having a liquid transfer device IV spike for sealing insertion into the infusion liquid container's IV port, a vial adapter port with an integral telescopic vial adapter for telescopic snap fit mounting on the discrete injection vial, and the substitute IV port for sealingly receiving the infusion set IV spike,
- said liquid transfer device IV spike being in direct and continuous fluid communication with said vial adapter port and said substitute IV port thereby enabling an initial forming of a medicated infusion liquid in the infusion liquid container and a subsequent administration of the mediated infusion liquid to a patient,
- said integral telescopic vial adapter having a longitudinal vial adapter centerline and comprising:
- i) an inner vial adapter body having an inverted cup shape with an uppermost transverse annular inner vial adapter body wall and a downward depending vial crown sleeve with a lowermost vial crown sleeve rim, said inner vial adapter body bounding a vial crown cavity for snugly receiving the tubular vial crown on telescopic mounting said inner vial adapter body thereon,
- ii) an outer vial adapter body having an inverted cup shape with an uppermost transverse outer vial adapter body wall and a downward depending skirt,
- said outer vial adapter body bounding an inner vial adapter body cavity for snugly telescopically receiving said inner vial adapter body therein on compacting said integral telescopic vial adapter from an initial pre-compacted state having a pre-compacted height H1 to a final compacted state having a compacted height H2 where H1>H2, wherein said pre-compacted height H1 and said compacted height H2 are between said uppermost transverse outer vial adapter body wall and said lowermost vial crown sleeve rim,
- a downward puncturing cannula with a proximal puncturing cannula opening in flow communication with said vial adapter port and a distal puncturing cannula tip for puncturing the injection vial stopper for flow communication with the vial tube,
- iii) a safety catch mechanism for preventing inadvertent user compaction of said vial adapter from said pre-compacted state to said compacted state, and
- iv) a clamping arrangement for irreversibly clamping said vial adapter in said final compacted state,
- said vial adapter being configured such that in said pre-compacted state, said distal puncturing cannula tip overlies the non-punctured injection vial stopper and, in compacted state, said distal puncturing cannula tip punctures through the injection vial stopper for flow communication with the vial tube.