Patent ID: 8328773

Claim:
Implantable medical device for injecting and/or collecting fluid substance into or from a human or animal organism, the device comprising a chamber for receiving said fluid substance, said chamber being demarcated by a wall which has at least one penetrable portion at which said wall can be pierced through in the direction of its thickness by a needle designed to inject and/or remove the fluid substance into or from the chamber, said device comprising a compressor configured to transversally compress the penetrable portion the compressor being arranged so as to stress said penetrable portion compressively along a first direction that is substantially transverse to the direction of thickness of the wall, wherein: the device is provided with a retainer designed to counter the buckling of the penetrable portion towards the exterior of the device under the effect of the compression exerted by the compressor; in that the penetrable portion extends, in the first transversal direction, between a first end and a second end, and in that the retainer comprises at least one external supporting element placed opposite the chamber relatively to the penetrable portion between the first and second ends to form a stop against said penetrable portion; and in that the retainer is capable itself of exerting a non-zero, radial and centripetal compressive stress on the external surface of the penetrable portion.