US 11,911,973 B2
Control circuitry comprising an adjustable capacitor
Philipp Winter, Homberg (DE); Lars Michel, Rosbach v. d. Höhe (DE); and Michael Schaefer, Friedberg (DE)
Assigned to Fresenius Kabi Deutschland GmbH, Bad Homburg (DE)
Filed by Fresenius Kabi Deutschland GmbH, Bad Homburg (DE)
Filed on Dec. 1, 2021, as Appl. No. 17/539,788.
Claims priority of application No. 20211533 (EP), filed on Dec. 3, 2020.
Prior Publication US 2022/0176641 A1, Jun. 9, 2022
Int. Cl. B29C 65/30 (2006.01); B29C 65/00 (2006.01); B29L 23/00 (2006.01); H05B 1/02 (2006.01)
CPC B29C 65/30 (2013.01) [B29C 66/95 (2013.01); B29L 2023/007 (2013.01); H05B 1/025 (2013.01)] 10 Claims
OG exemplary drawing
 
1. Method to operate a sealing device (1) to seal a medical tubing (2), comprising:
receiving said medical tubing (2) in a receptacle (100), the receptacle (100) comprising an electrode arrangement for causing a welding action on the tubing (2), and
supplying an alternating electrical current to the electrode arrangement using a control circuitry (11) operatively connected to the electrode arrangement of the receptacle (100), the control circuitry (11) comprising an adjustable capacitor (C1) and a generator device (110),
characterized by applying, using a bias source (111) of the control circuitry (11), a DC bias voltage (V2) to said capacitor (C1), and using the generator device, the alternating electrical current to said capacitor, to adjust a capacitance value of the capacitor (C1) by a DC-bias effect.
 
2. Sealing device (1) to seal a medical tubing (2), comprising a receptacle (100) to receive said medical tubing (2), the receptacle (100) comprising an electrode arrangement for causing a welding action on the tubing (2), and
a control circuitry (11) comprising an adjustable capacitor (C1) and a bias source (111) configured to apply a DC bias voltage (V2) to said adjustable capacitor (C1) to adjust a capacitance value of the adjustable capacitor (C1), the control circuitry (11) being operatively connected to the electrode arrangement of the receptacle (100), the control circuitry (11) comprising a generator device (110) to supply an alternating electrical current to the electrode arrangement,
wherein the alternating electrical current and DC bias voltage are simultaneously applied to the adjustable capacitor to adjust the capacitance value of the adjustable capacitor.