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Dans les hôpitaux, le personnel médical perd beaucoup de temps sur de petites actions, dont la prise de sang.

Celle-ci est parfois difficile et demande une certaine dextérité. Chaque patient ayant ses particularités (peau fragile, veines plus ou moins visibles), la nécessité de mettre en place un dispositif de repérage des veines apparaît comme une nécessité. Nous avons cherché à contourner les différents éléments qui compliquent les poses de cathéter et les prises de sang, afin de limiter les erreurs de piquée et les blessures qui s'en suivent.

Notre système est capable de piquer de manière autonome une veine ou une artère d'un patient, en vue de poser un cathéter ou de faire une prise de sang. Un système de repérage des veines utilisant une image infrarouge et du traitement d'image permet de répondre à ce besoin. Associé à ce repérage, le système est capable de piquer à l'endroit précis trouvé grâce au traitement d'image. La prise en charge du patient permet à celui-ci de ne pas voir le système de piquée (source de tensions pour de nombreux patients), mais aussi de rendre la procédure indolore.

Le système complet comprend : le support du système, le support pour le bras du patient, le mécanisme de déplacement de l'électronique embarquée, une caméra infrarouge, une lampe ultraviolet, une lampe infrarouge, les moteurs de déplacement du petit charriot contenant l'électronique embarquée, un module Peltier ainsi que les deux moteurs nécessaires à ses mouvements pour entrer en contact avec la peau du patient. Une sonde à ultrasons participe au calcul de profondeur de la veine à piquer. Dans un premier temps, la face de température élevée du module Peltier est positionnée sur le creux du bras du patient. Le module se retire alors automatiquement. Le charriot contenant l'électronique embarquée se déplace au-dessus du bras du patient. Une caméra infrarouge balaie la zone visible du bras et un calcul, après traitement d'image, permet de déterminer la position de la veine à piquer. La face de température basse de l'effet Peltier est alors positionnée sur cette zone à piquer. Elle est munie de deux petites barrettes métalliques qui maintiennent la veine et procurent un effet anesthésiant du fait de leur température basse. La seringue est alors positionnée à l'endroit exact déterminé par le traitement d'image, et une piquée très rapide et indolore est alors réalisée. Si la procédure engagée est une prise de sang, celui-ci est alors récolté dans un tube puis étiqueté automatiquement et enfin rangé dans un espace de rangement adaptés aux tubes à essais.

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