초록 ▼

A blood sampling unit having a barrel member consisting of a calibrated tubular body which is reduced at one end to form a projecting hollow neck for provision of a hollow needle containing a floating stopper and a slideable plunger. The plunger has an axially disposed gas channel in communication w

A blood sampling unit having a barrel member consisting of a calibrated tubular body which is reduced at one end to form a projecting hollow neck for provision of a hollow needle containing a floating stopper and a slideable plunger. The plunger has an axially disposed gas channel in communication with the barrel and an orifice at its distal end. The unit is designed so that a supply of liquid or dry anticoagulant can be introduced into the portion of the projecting neck extending between the stopper and the needle. Alternately, the heparin or other anticoagulant can be obtained from a vial by drawing the heparin through the hollow needle and into the syringe proper. The plunger acts as a stop so that when its proximal end is set at the proper calibration for the desired sample, arterial blood pressure will move the floating stopper into abutment with the proximal end of the plunger while evacuating residual air through the axially disposed gas channel.

대표청구항 ▼

A blood sampling unit comprising: A. a barrel member defining a substantially tubular member of uniform diameter and having: 1. an internal wall section, and 2. a proximal end of reduced internal diameter and including a projecting hollow neck; B. a hollow needle having a piercing end and an elongat

A blood sampling unit comprising: A. a barrel member defining a substantially tubular member of uniform diameter and having: 1. an internal wall section, and 2. a proximal end of reduced internal diameter and including a projecting hollow neck; B. a hollow needle having a piercing end and an elongated hollow shank portion and a connecting hub for connection to said hollow neck of said barrel; C. a floating stopper having at least one peripheral sealing ring for rubbing engagement with the internal walls of said tubular member and for moving in either direction along the longitudinal axis of said tubular member; D. a plunger member having: 1. sealing means for close sliding engagement with the interior walls of said barrel member and, 2. a central gas channel extending axially through said plunger member, said gas channel opening directly into said barrel member and having an exterior orifice for introduction and evacuation of air.