Abstract: This treatment device (10) for a biological valve includes: an implant (12) having a proximal sleeve (14), deployable between a retracted configuration and a deployed configuration, and comprising a plurality of proximal arms (32) intended to bear on a first face of a leaflet (18) or on an annulus (17) of the valve, a release tool (14) for releasing the implant (12), the implant (12) being mounted in the release tool (14) in its retracted configuration. The device (10) comprises a pushing member (16) for pushing the face of the valve leaflet (18) away from a free end of the proximal arms (32), movable relative to the implant (12) kept in its configuration retracted in the release tool (14) between a withdrawn position and a deployed position pushing the face of the leaflet (18).