Device for extracorporeal blood treatment
Inventors
Thiebaud, Pierre • Magnenat, Olivier • Cueni, Reto • Neftel, Frédéric
Assignees
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Publication Number
US-11092148-B2
Publication Date
2021-08-17
Expiration Date
Abstract
The invention relates to a system for treating blood, which includes a single cassette capable of carrying out the various CRRT treatments.
Core Innovation
The disclosure describes a medical pump system using a disposable cassette having a pump and a reusable apparatus having a drive device configured to cooperate with the pump of the disposable cassette. The reusable drive device includes a floating shaft having a rotational axis rotatably driven by drive means, and the floating shaft includes a cavity inside which the drive means is at least partially circumscribed.
The invention limits an orientational freedom of the rotational axis of the floating shaft relative to the motor axis by cooperation between a body of the drive means and internal walls of the cavity. This cooperation is configured to compensate for tolerance errors of the pump, and the cavity includes a cooperation element allowing the drive means to apply a rotation movement to the floating shaft.
The internal walls are configured to cooperate with the external walls of the body to allow rotational-axis pitching movements between +/-10 degrees relative to the motor axis, and the internal walls include a cone shape with a cone angle between 0 degrees and 90 degrees. These structural constraints define the tolerance-compensating mechanical relationship between the floating shaft and the motor axis in the reusable apparatus coupled to the disposable cassette pump.
Claims Coverage
The document provides three independent claims that share the same floating-shaft drive architecture for a disposable cassette pump coupled to a reusable apparatus. Across the independent claims, the main inventive features include a floating shaft with a circumscribing cavity for the drive means, a body/cavity wall cooperation that compensates pump tolerance errors, a cavity cooperation element applying rotation movement, and pitch-motion and cone-angle constraints of the cavity internal walls.
Floating-shaft drive with circumscribed drive means cavity
A medical pump system comprising a disposable cassette having a pump and a reusable apparatus having a drive device configured to cooperate with the pump of the disposable cassette, wherein the drive device includes a floating shaft having a rotational axis rotatably driven by a drive means, the drive means configured to be coupled to a motor rotor having a motor axis of the reusable apparatus, wherein the floating shaft includes a cavity inside which the drive means is at least partially circumscribed, and wherein the cavity includes a cooperation element allowing the drive means to apply a rotation movement to the floating shaft.
Body and cavity internal wall cooperation to compensate pump tolerance errors
A medical pump system comprising a disposable cassette having a pump and a reusable apparatus having a drive device configured to cooperate with the pump of the disposable cassette, wherein the drive means includes a body configured to cooperate with internal walls of the cavity to limit an orientational freedom of the rotational axis of the floating shaft relative to the motor axis to compensate for tolerance errors of the pump.
Pitching movements limited to +/-10 degrees
A medical pump system comprising a disposable cassette having a pump and a reusable apparatus having a drive device configured to cooperate with the pump of the disposable cassette, wherein the internal walls of the cavity are configured to cooperate with external walls of the body to allow the rotational axis of the floating shaft to undergo pitching movements relative to motor axis between +/-10 degrees.
Cone-shaped cavity internal walls with cone angle between 0 degrees and 90 degrees
A medical pump system comprising a disposable cassette having a pump and a reusable apparatus having a drive device configured to cooperate with the pump of the disposable cassette, wherein the internal walls of the cavity include a cone shape having a cone angle of between 0 degrees and 90 degrees.
Across the independent claims, the coverage is centered on a reusable drive device coupled to a disposable cassette pump via a floating shaft. The drive means is at least partially circumscribed by a cavity, and cooperation between a body and the cavity internal walls limits orientational freedom of the floating shaft’s rotational axis to compensate for pump tolerance errors. Additional independent-claim limitations include permitting pitching movements between +/-10 degrees and/or providing cone-shaped internal cavity walls with a cone angle between 0 degrees and 90 degrees.
Stated Advantages
Documented Applications
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