Device for the injection of medical preparations with CT/MRI monitoring

1. A device for the injection of medical preparations into a patients body ( 35 ) during an examination in a Computer Tomograph (CT) or in a Magnetic Resonance Tomograph (MRT) or endoscopically, said device including an injection-needle, advancing arrangement, an injection needle ( 1 ) supported by said injection-needle advancing arrangement for inserting the injection needle ( 1 ) into the body of the patient ( 35 ) and the concurrent injection of a medical preparation, a separate dosing apparatus ( 6 ) for the storing and sensor controlled transport of the medical preparations, said dosing apparatus ( 6 ) including an exchanger magazine ( 7 ) for removably accommodating several one-way syringes ( 5 ), each including a piston ( 10 ), a syringe carrier ( 17 ) connected to each syringe and a drive ( 9 ) with an electric motor ( 15 ) and a worm drive ( 16 ) connected to each syringe carrier ( 17 ) for independently operating the syringes ( 5 ), a separate hose ( 4 ) extending from each syringe ( 5 ) and being connected to a mixing chamber ( 36 ) which is common to all syringes ( 5 ) and the hoses ( 4 ), each hose including a check valve ( 3 ) arranged shortly ahead of the connection to the mixing chamber ( 36 ) for the one-way transport of the medical preparations from the dosing apparatus ( 6 ) to the injection needle ( 1 ) and a pressure sensor ( 2 ) in communication with each syringe ( 5 ) for monitoring the supply of the medical preparations from the dosing apparatus ( 6 ) to the injection needle ( 1 ), said injection needle advancing arrangement comprising a needle guide structure, an injection needle holder ( 13 ) and an operable linear drive ( 14 ) for the movement of the injection needle holder ( 13 ) in parallel with the injection needle ( 1 ), said injection needle holder linear drive ( 14 ) and said dosing apparatus ( 6 ) and also the drives ( 9 ) thereof having dimensions and consisting of materials permitting the introduction thereof into the CT or MRT and being operative therein, the needle holder ( 13 ) is for engaging the needle so as to move the needle ( 1 ) together with the needle holder and for releasing the needle so as to move the needle holder without moving the needle for repositioning the holder on the needle.

2. Device according to claim 1 , wherein all components of the device consist of a non-magnetic material, and neither the syringe carrier drives ( 9 ) nor the linear drive ( 14 ) of the device furthermore requires or generates a magnetic or electrical field but is a pneumatic or hydraulic drive or a piezo drive, any magnetically generated drive power being generated outside the CT or MRT, the drive power being then transmitted to the device mechanically by way of Kardan- Bowden cable- or cable drives or hydraulically or pneumatically by pressure piston drives.

3. Device according to claim 1 , wherein the injection needle ( 1 ) is movable by pivoting arrangements including a curved guide structure ( 33 ) having a center of curvature coinciding with a needle insertion point ( 38 ).

4. Device according to claim 3 , wherein the device includes a sensor ( 39 ) which operates pneumatically or hydraulically or optoelectronically and which is arranged at the level of the needle insertion point ( 38 ) for sensing any movement of the patient.

5. Device according to claim 1 , wherein the injection needle advancing arrangement is a two-part modular design, and the injection needle ( 1 ) and the needle holder ( 13 ) are associated with a first part which can be sterilized and the linear drive ( 14 ) for moving the needle is associated with a second part which does not need to be sterile.