Conveying Device for Body Fluid
A conveying device for body fluid includes a catheter tube having a distal end to be inserted into the body and a proximal end. In order to provide a conveying device which can no longer become clogged with coagulating substances, a hollow body which is arranged in a longitudinally moveable and/or rotatable manner in the catheter tube, extends from the distal end at least up to the proximal end, and forms a transport channel over its length extending in the extension direction of the catheter tube.
1 . A conveying device for body fluid comprising a catheter tube having a distal end to be inserted into the body and a proximal end, wherein a hollow body which is arranged longitudinally moveable rotatable in the catheter tube, extends from the distal end at least up to the proximal end, and forms a transport channel over its length extending in the extension direction of the catheter tube.
2 . The conveying device according to claim 1 , the hollow body is provided over its length with at least one radially extending scraping segment.
3 . The conveying device according to claim 1 , the hollow body being formed by a helix.
4 . The conveying device according to claim 1 , characterized in that the catheter tube at least one opening in the region of its distal end on its shell surface and the hollow body forming a scraping edge which interacts with the opening.
5 . The conveying device according to claim 1 , the catheter tube having an axial stop for the hollow body at its distal end.
6 . The conveying device according to claim 1 , the hollow body being insertable into a drive element and coupled to the drive element.
7 . The conveying device according to claim 1 , further comprising a coupling unit with a coupling housing having a catheter tube connection and a suction line connection which communicate with a flow channel surrounded by the coupling housing.
8 . The conveying device according to claim 7 , further comprising a drive element rotatably supported on the coupling housing for driving the hollow body.
9 . The conveying device according to claim 7 , the suction line connection, the catheter tube connection and/or the drive element having an internal diameter which is configured in a manner adapted for the passage of the hollow body.
10 . The conveying device according to one of claims 7 , the flow channel being at least partially formed by a sleeve which is rotatably supported in the coupling housing and can be detachably connected to the hollow body in a non-rotating manner.
11 . The conveying device according to claim 10 , the sleeve being detachably connectable to the coupling housing and detachably drivingly connectable to a sleeve drive element.
12 . The conveying device according to claim 11 , the sleeve drive element having a drive shaft which is exposed at the coupling housing.
13 . The conveying device according to claim 1 , further comprising a flushing line communicating with at least one of the catheter tube, the suction line, or with the flow channel.
14 . The conveying device according to claim 6 , further comprising a drive which can be drivingly coupled to the drive element, and a drive control associated with the drive, which is configured such that the hollow body can be rotated via the drive.
15 . The conveying device according to claim 14 , the drive control having a torque detection and in that the detected torque enters the control of the drive.
16 . The conveying device according to claim 14 , the drive control being in a structural unit with a suction control of a suction pump which is assigned to a collection container which can be connected to the suction line.
17 . The conveying device according to claim 14 , the drive control being connected data-wise to a pressure sensor measuring a suction pressure in the suction line.
18 . A method for operating a fluid conveying device for body fluid comprising a catheter tube having a distal end and a proximal end and a hollow body which hollow body is arranged longitudinally moveable and/or rotatable in the catheter tube, which hollow body extends from the distal end at least up to the proximal end, and forms a transport channel over its length extending in the extension direction of the catheter tube in which method the hollow body is moved longitudinally and/or rotated within the catheter tube while the catheter tube is held in place and while a negative pressure is applied at the proximal end of the catheter tube to convey by means of a suction pressure liquid through the transport channel and into a collection container.
19 . The conveying device according to claim 1 , further comprising a flushing line communicating with the catheter tube and with the suction line and with the flow channel.