Airbag apparatus for a vehicle seat and vehicle seat having an airbag apparatus

An airbag apparatus, comprising:

• an airbag module including an airbag, the airbag module configured to be attached to a vehicle seat;
• a catch strap module configured to be attached to the vehicle seat, the catch strap module including:
• a catch strap including a fixed end and a distal end, the distal end coupled to the airbag;
• a first guide element configured to guide the catch strap;
• a second guide element configured to guide the catch strap, wherein the first guide element is configured to guide the catch strap between the fixed end of the catch strap and the second guide element, and wherein the second guide element is configured to guide the catch strap between the first guide element and the distal end of the catch strap such that the catch strap extends in a first direction between the first guide element and the second guide element and in a second direction between the second guide element and the distal end;
• and
• a tightening device comprising:
• a tightening element configured to contact the catch strap between the fixed end of the catch strap and the first guide element;
• and
• a pyrotechnic drive configured to accelerate the tightening element to tighten the catch strap.