Device for injecting a liquid into a body of a patient

A device for injecting liquid into a body, such as that of a patient, comprising:

• a base bearing an injection needle that is intended to be inserted into the body;
• an injection conduit connected to the injection needle;
• an extractor for extracting the injection needle from the patient, including a push element mounted such that it can slide in relation to the base between an injection needle use position and an injection needle extraction position;
• a pressure generator for generating excess pressure in the injection conduit as the injection needle is being extracted, including a compressible and flexible segment formed in the injection conduit, a cam surface solidly connected to the push element and a supported surface solidly connected to the base, in order to compress the aforementioned compressible and flexible segment between the cam surface and the supporting surface radially and perpendicularly to the injection needle as the push element slides towards the injection needle extraction position;
• wherein the device includes a retainer for retaining the compressible and flexible segment substantially perpendicular to the injection needle,
• wherein the retainer includes a receiving channel for receiving the compressible and flexible segment, formed in the base, and
• wherein the supporting surface is a flank of the receiving channel arranged substantially parallel to the direction of movement of the push element.

A device for injecting liquid into a body, such as that of a patient, comprising:

• a base bearing an injection needle that is intended to be inserted into the body;
• an injection conduit connected to the injection needle;
• an extractor for extracting the injection needle from the patient, including a push element mounted such that it can slide in relation to the base between an injection needle use position and an injection needle extraction position;
• a pressure generator for generating excess pressure in the injection conduit as the injection needle is being extracted, including a compressible and flexible segment formed in the injection conduit, a cam surface solidly connected to the push element and a supporting surface solidly connected to the base, in order to compress the aforementioned compressible and flexible segment between the cam surface and the supporting surface radially and perpendicularly to the injection needle as the push element slides towards the injection needle extraction position;
• wherein the device includes a retainer for retaining the compressible and flexible segment substantially perpendicular to the injection needle, and
• wherein the base includes an injection needle holder and a sleeve, said sleeve being articulated relative to the injection needle holder and defining a sliding passage of the push element.