FR2687917A1 - Thin implantable casing for permanent axis to the blood vessels especially during chemotherapy - Google Patents

Abstract

Rigid implantable casing intended to keep permanent vascular access, especially for long-term chemotherapy treatments. The shape and the structure are intended to give the casing sufficient liquid content capacity for a height which is as small as possible in view of the strength of the capsule (C). It is formed by a short cylinder of height (A) containing the capsule (C), closed at its bottom by a hollow sphere portion (K) which can be drained through a channel (F), the whole being held by an element (H) which constitutes both a base part of the cylinder and the rim (D) on which the capsule (C) is blocked.

Description

LOW THICKNESS IMPLANTABLE HOUSING FOR PERMANENT ACCESS TO
BLOOD VESSELS, PARTICULARLY DURING THE HOSPITALS.

 The present invention relates to the field of materials implantable in humans in the context of surgery and medicine, particularly in chemotherapy.

 Access to the veins or arteries for long-term treatments, particularly in chemotherapy, calls on already known devices. They generally include a metal or synthetic material box which can be punctured through the skin and the subcutaneous tissue, on a slope provided for this purpose and which is also connected to a catheter which has previously been introduced into a vein or an artery. . The goal is to deliver an intravascular medication without having to puncture each time a vein or an artery. The housing is generally cylindrical, its upper part is occupied by a flexible plastic capsule which can be punctured by a needle, its lower part is closed, leaving a space between it and the capsule for the diffusion of the injected liquids which can then pass into the exit catheter.

 These materials are quite bulky causing an elevation of the integuments, making them prominent especially in emaciated patients. In these, the cylinder seems too volu minor the absence of fatty tissue makes it aggressive for the skin and for the underlying muscles.

 Our equipment is intended for these patients with thin coatings but also for those who have a normal subcutaneous cellulo-fatty thickness so that the housing is hardly or not visible and is not annoying.

 For these reasons, our case is formed by a cylinder of low height containing the whole of the puncturable capsule and a sufficient underlying space because delimited inside and outside by a partially spherical shape, this which leaves sufficient space inside for the puncture needles and leaves a very small space outside as far as the spherical part occupies only part of the bottom of the housing; in fact, the bottom of the cylinder is formed in part by a plate, which constitutes an element for fixing and holding by projecting from the sides of the cylinder outside and a element for holding the capsule inside where it forms a circular rim reducing '' the location of the spherical cap.

 Figure N "1 represents the box in vertical section passing through the diameter where the evacuation channel is located (F), showing the walls of the cylinder (B) folded at their upper part to hold the block of the capsule (C) ; this is supported on the rim (D) which is an extension of the stabilization and fixing element (H), leaving a free space (E) between the capsule and the spherical cap (K) which opens on the discharge channel (F) which itself ends with a bulge (G) and notches (Gi, G2 ...). This figure includes the dimensions in millimeters: cylinder height of 6 mm height of the spherical cap about 4 mm; cylinder diameter about 15 mm.

 Figure N "2 shows the box seen in transparency from top to bottom, the folded part of the sides (B) delimiting the access to the capsule (C); the support zone (H) has an octagonal shape, which can be pierced with holes (I) and whose internal edge forms the circular line (L) immediately inside the rim (D).

 Figure N "3 shows the external appearance of the housing: the cylinder wall (A), the support element (H) and the spherical cap (K) the evacuation channel (F) located immediately below of (H) and having the bulge (G).

 The box thus schematized is intended to be implanted under the skin in the subcutaneous cellular tissue or in contact with the muscular tissues. It is constructed from metal (titanium or a biocompatible alloy) or molded from synthetic material. Its shape is such that the upper access is wide enough to be well located manually under the integuments and to be punctured without difficulty; its height does not cause skin distension.

The small cap (K) easily pushes the muscle surface down; can integrate into the muscle or surrounding tissue and can form an anchor
housing. Element (H) allows the housing to be fixed using the
orifices (I).

Claims (4)

 1) Housing implantable under the integuments, can be punctured through them and allowing permanent access to blood vessels characterized in that its structure is formed by a cylinder of low height containing a capsule (C) of sufficient size for sealing and the safety of punctures, closed at its lower part by a portion of hollow sphere (K) connected to an evacuation channel (F).  2) Device according to claim i characterized by a support element (H) located at the junction of the cylinder (A) and the sphere portion (K) allowing better integration and fixing to neighboring tissues.  3) Device according to claims i and 2 characterized in that the flange (D), part of the element (H), constitutes both a part of the bottom of the cylinder (A) and the support of the capsule (C ).  4) Device according to claims 1, 2, 3 characterized in that the discharge channel (F) whose direction is parallel to the lower part of the cylinder, can abut at the portion of sphere (K) either at its upper part immediately below the capsule (C) or at its lower part, its lower edge then being tangential to the lowest point of the cavity.