Semi disposable auto injector

An automatic injection device comprising:

• a reusable driving assembly having a needle insertion operative orientation;
• and
• a disposable cassette assembly comprising a cassette housing element, a prefilled syringe including a needle and a needle guard element,
• said cassette housing element and said needle guard element being arranged such that prior to both said disposable cassette assembly having been inserted into said reusable driving assembly and said reusable driving assembly being in said needle insertion operative orientation, relative axial displacement between said cassette housing element and said needle guard element is prevented.

An automatic injection device comprising:

• a reusable driving assembly having a forward injection end and multiple mutually axially displaceable elements;
• and
• a disposable cassette assembly including a cassette housing element, a prefilled syringe including a needle for injecting an injectable liquid at an injection site and a needle guard element,
• wherein:
• said disposable cassette assembly is removably insertable into said reusable driving assembly at said forward injection end;
• following insertion of said disposable cassette assembly into said reusable driving assembly, said automatic injection device may be caused to assume an injection site engagement operative orientation by pressing said forward injection end of said reusable driving assembly against said injection site, thereby producing mutual axial displacement of at least some of said multiple mutually axially displaceable elements but not producing relative axial displacement between said needle guard element and said cassette housing element of said disposable cassette assembly.

An automatic injection device comprising:

• a reusable driving assembly having a forward injection end;
• and
• a disposable cassette assembly;
• wherein:
• said disposable cassette assembly is removably insertable into said reusable driving assembly at said forward injection end;
• following injection, said disposable cassette assembly extends partially outside of said reusable driving assembly at said forward injection end and is releasably retained in said reusable driving assembly;
• and
• said disposable cassette assembly may thereafter be fully disengaged from said reusable driving assembly by axially pulling said disposable cassette assembly out of said reusable driving assembly.