A pressure jacket configured for connecting to an injector head of a fluid injector has an open distal end, an open proximal end, and a sidewall defining a throughbore extending between the distal end and the proximal end along a longitudinal axis. The throughbore is configured for receiving at least a portion of a syringe. The pressure jacket has at least one syringe retaining element positioned at least partially within the throughbore. The at least one syringe retaining element is configured for engaging at least a portion of the syringe during pressurized delivery of fluid from the syringe to prevent or limit a distal movement of the syringe relative to the pressure jacket.本發明揭示一種經構形用於連接至一流體注入器之一注入器頭部之壓力套,該壓力套具有一敞開遠端、一敞開近端及界定一通孔之一側壁,該通孔沿著一縱軸在該遠端與該近端之間延伸。該通孔經構形用於接納一注射器之至少一部分。該壓力套具有至少部分地定位在該通孔內之至少一注射保持元件。該至少一注射保持元件經構形用於在自該注射器加壓輸送流體期間接合該注射器之至少一部分,以防止或限制該注射器相對於該壓力套之一遠端移動。16‧‧‧壓力套18‧‧‧前端/遠端19‧‧‧驅動部件/活塞22‧‧‧後端/近端23‧‧‧縱軸24‧‧‧壓力套側壁30‧‧‧注射器34‧‧‧第二散裝體液源/前端/遠端38‧‧‧撓性側壁42‧‧‧排放頸部50‧‧‧徑向凸緣52‧‧‧近端表面60‧‧‧注射保持元件62‧‧‧膨脹凹穴B‧‧‧箭頭
