The present invention relates to a portable ultrafiltration device which, by means of a tube (8) passing through a solenoid valve (10), itself originates from a vascular access (4) and passes through a peristaltic pump (5). Of the coupler of the blood filter (1) incorporated in the blood circuit made up of (2) and the venous line (3) passing through the safety electronic unit (6) and returning to the vascular access (4) It has a vacuum suction bellows (9) connected to one of them, while the other coupler is connected to an ultrafiltration pressure sensor (7). The peristaltic pump (5), safety electronic unit (6), ultrafiltration pressure sensor (7) and solenoid valve (10) are connected and controlled by an intelligent central device (11) powered by a rechargeable battery. The The patient's blood flows through the blood circuit, and the negative pressure generated by the vacuum suction bellows (9) is transmitted through the connecting tube (8) to limit the blood through the fibers of the blood filter (1). Causes filtration. Body fluid is thus accumulated in the space surrounding the fiber and in the vacuum suction bellows (9) until the vacuum suction bellows is completely filled. As the vacuum suction bellows (9) is filled, the negative pressure exerted by the vacuum suction bellows decreases until it reaches zero, and then slowly increases until a level of pressure is reached that circulates in the blood contained in the fibers. At that time, ultrafiltration stops and the central device (11) informs the user of the end of treatment by visual and audible alarm. The blood is returned to the patient via an infusion of isotonic physiological solution. The blood filter (1) and the vacuum suction bellows (9) are then removed from the device. [Selection] Figure 1本発明は可搬式限外ろ過装置に関しており、該装置は、電磁弁（１０）を通り抜けるチューブ（８）によって、それ自体はバスキュラーアクセス（４）から発して蠕動ポンプ（５）を通り抜ける動脈ライン（２）と安全のための電子ユニット（６）を通り抜けてバスキュラーアクセス（４）に戻る静脈ライン（３）とからできている血液回路内に組み込まれる、血液ろ過器（１）のカプラのうちの一つにつながれる真空吸引方式ベローズ（９）を有し、一方、もう一つのカプラは
