Importance

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Abstract

An injection apparatus for injecting liquids into a blood vessel of a living body includes an injector housing provided at its front end with a retaining or holder member for supporting an injection syringe containing a piston located in a cylinder of the injection syringe. The retaining member is adapted to exchangeably receive injection syringes of different cylinder cross-sections. A sensing device substantially comprises two sensing or feeler brackets and two switches cooperating with the sensing brackets. The sensing or feeler brackets are journaled in the retaining or holder member and are adapted to be deflected by interaction with the syringe cylinder. The deflection is particularly accomplished by a flange provided at one end of the syringe cylinder and having a diameter governed by the cylinder cross-section. Upon its deflection the sensing bracket actuates a related one of the switches to thereby transmit a signal dependent upon the cylinder cross-section to a control of a suitable drive arrangement containing a spindle mechanism in order to advance the piston at a controlled rate.

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First Claim