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US 8,945,055 B2Granted
Injection arrangement
AssigneeSanofi-Aventis Deutschland GmbH
InventorsNils Basso, Thomas Nagel, Rene Richter, Robert Witt
Life of this patent
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AssigneeSanofi-Aventis Deutschland GmbH
InventorsNils Basso, Thomas Nagel, Rene Richter, Robert Witt
Estimating the term…
The invention relates to a pump unit (2), replaceably attachable to a reusable backend (3) of an injection arrangement (1) for delivering a liquid medicament, the pump unit (2) comprising a medicament inlet (2.1), a medicament outlet (2.2) and a peristaltic pump for delivering the liquid medicament from the inlet (2.1) to the outlet (2.2), the peristaltic pump comprising a pump rotor (2.3) and a pump hose (2.4), the pump hose (2.4) partially arranged around the pump rotor (2.3), the pump rotor (2.3) having protrusions (2.5) for engaging the pump hose (2.4), wherein a fixing side (2.6) of the pump unit (2) facing a reusable backend (3) when attached has a recess (2.7) in the shape of a circular arc for allowing a correspondingly shaped stop (3.1) protruding from the reusable backend (3) to enter into the pump unit (2) so as to support the pump hose (2.4) from an outer side opposite the pump rotor (2.3) thus allowing the protrusions (2.5) to locally squeeze the pump hose (2.4) against the stop (3.1) when attached to the reusable backend (3).
A pump unit, replaceably attachable to a reusable backend of an injection arrangement for delivering a liquid medicament, the pump unit comprising a medicament inlet, a medicament outlet and a peristaltic pump for delivering the liquid medicament from the inlet to the outlet, the peristaltic pump comprising a pump rotor and a pump hose, the pump hose partially arranged around the pump rotor, the pump rotor having protrusions for engaging the pump hose, characterized in that a fixing side of the pump unit facing a reusable backend when attached has a recess in the shape of a circular arc for allowing a correspondingly shaped stop protruding from the reusable backend to enter into the pump unit so as to support the pump hose from an outer side opposite the pump rotor thus allowing the protrusions to locally squeeze the pump hose against the stop when attached to the reusable backend.
Reusable backend for an injection arrangement for delivering a liquid medicament, comprising a medicament container, a control unit, a drive unit and an energy source, the reusable backend attachable to a replaceable pump unit, characterized in that the reusable backend comprises a stop with a circular arc profile protruding from a front side facing the replaceable pump unit when attached for entering a correspondingly shaped recess in the replaceable pump unit so as to support a pump hose of the pump unit from an outer side opposite a pump rotor of the pump unit thus allowing protrusions of the rotor to locally squeeze the pump hose against the stop.
Dependencies are inferred from the claim text.