MX2008012565A - Venous access port base. - Google Patents

Abstract

A venous access port (100,100A) having a port body (102), a septum (104), a chamber (112,112A) and a discharge port (108) with a passageway (110) extending therethrough outwardly from the chamber. The central region of the chamber (112,112A) is elevated with respect to the periphery of the chamber floor adjacent the chamber side wall and may be convex or conical, with the chamber floor periphery defining a vortex flow path (116,116A).

Description

BASE FOR PORT OF VENOUS ACCESS FIELD OF THE INVENTION The present invention relates to the field of medical devices and more particularly to venous access ports.

BACKGROUND OF THE INVENTION Several ports of venous access for the infusion and / or removal of fluids from a patient are well known. These devices are usually used for the infusion of drugs or small amounts of blood aspiration. When large fluid flows are required, larger ports can be used for hemodialysis or plasmapheresis. Some ports can be implemented subcutaneously. The implantable venous access ports have the advantage that they can remain inside the patient for prolonged periods, allowing multiple uses and decreasing the risk of an associated infection. Normally these ports provide a septum that defines an access site for multiple needle points without the need to continually search for new access sites, since the septum comprises a material, such as a silicone elastomer, that self -screws each time it is removed. a needle. These ports also each include a shank, or a discharge port, that extends through a distant wall and has a passage therethrough; the rod is secured to the proximal end of a catheter, so that the discharge port passage is in fluid communication with the catheter lumen. One of these catheter infusion ports is described in the U.S. patent. No. 6.1 13.572. Other types of ports are used, known as dual ports or multiple ports. These provide two or more internal septa and chambers, all corresponding to different lumens of the catheter attached through respective separate discharge ports or alternatively, separate passages in a single shank for communication with separate lumens of a dual or multi lumen catheter, as in the US patent No. 5,360,407. Said venous access ports commonly have a circular shape, or at least the chamber, or each chamber, is commonly circular and the floor of the chamber is flat. As a result of the circular shape of a chamber and the flat floor of the chamber, the liquid injected during the infusion exhibits a whirling behavior, and it has been noted that a little liquid remains in the chamber because it is near the center of the chamber. flat floor of the circular chamber, while the whirlwind of flow occurs around the periphery of the floor of the chamber. It is preferable to minimize the amount of liquid remaining in the chamber of a venous access port during infusion.

BRIEF DESCRIPTION OF THE INVENTION The present invention is a venous access port having a chamber or a fluid reservoir floor defined and configured to be raised in the center of the chamber, with inclined floor side surfaces extending towards the periphery of the chamber floor of the chamber. shape adjacent to the side wall of the chamber. Preferably the floor of the chamber is convex or dome-shaped, but also the floor of the chamber may be conical with a vertex of low height and inclined flat side surfaces, and the chamber floor preferably radiated adjacent to the side wall of the camera.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated herein and forming a part of this specification, illustrate the presently preferred embodiments of the invention, and serve, together with the general description that was provided above and the detailed description to be provided below, to explain the features of the invention. In the drawings: Figure 1 is an exploded isometric view of a venous access port containing the present invention; Figure 2 is a cross-sectional view of the assembled port of Figure 1, illustrating the present invention; and Figure 3 is a cross-sectional view of an alternative embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION In the drawings the same numbers indicate similar elements through it. Certain terminology is used herein for convenience only, and should not be taken as a limitation in the present invention. The terms "distant" and "proximal" refer, respectively, to directions near and far from the insertion tip of a catheter in an implantable catheter assembly. The terminology includes the words mentioned specifically, derived from them and the words of similar amount. The modalities illustrated below are not intended to be exclusive or limiting of the invention, to the precise form described. These modalities are chosen and described to better explain the principle of the invention, and its application and practical use, and to enable other experts in the art to better utilize the invention. In Figures 1 and 2 a first embodiment of the venous access port 100 is illustrated, and includes a base 102, a septum 104 and a retaining cap 106 that secures the septum to the base. A discharge port 108 extends from the base on which the proximal end of a catheter (not shown), and a passageway 10 extends through the discharge port 108 into the lumen of the catheter, from the chamber 12 which is defined between the septum 104 and the base 102. The septum 104 is made with a self-sealing material, preferably of silicone elastomer, so that an infusion needle can be inserted through the septum for the infusion of a medicament, and that with the removal of the needle from the septum, it immediately seals the hole through from which the needle had extended. In Figure 2 a chamber 12 is shown in cross section. The floor of chamber 1 14 is convexly shown upwards in the center of the chamber, and a vortex flow path 1 16 can be seen which is defined around the periphery of the chamber. The passage 1 10 also extends outwardly from the chamber and through the discharge port. As a result of the convex shape of the floor of chamber 1 14, the infused medicament will flow in this vortex flow path 1 16, and eventually as soon as the fluid level within the chamber decreases, all the liquid in the center of the chamber will flow. The chamber will force the flow radially from the center towards the side wall of the chamber 18 and within the vortex path. With the raised floor of the chamber of the present invention, it can be seen that the exit of the infused fluid starts faster than with a flat floor design, since no fluid can remain in the central region of the floor of the chamber.

Alternatively, as can be seen in Figure 3, the chamber floor 1 14A of a second venous access port 100A may have a low height conical shape, with an apical center point 1 15 and inclined flat side surfaces 17 which extend towards the periphery of the chamber, again defining a vortex flow path 1 16A, preferably at said location the surfaces are radiated to be tangential to the side wall 1 18A of the chamber. It will be seen that it is preferable that the floor of the chamber of the present invention be raised in its central region relative to the periphery thereof, and that the floor of the chamber have no substantial-level portion portions. Variations of the present invention can be provided in the chambers of the dual-chamber or multi-chamber venous access ports, and achieve the benefits of the present invention, of minimizing the liquid remaining in the chamber after infusion.

Claims (3)

NOVELTY OF THE INVENTION CLAIMS

1 .- A port of venous access (100, 100A) to implant it in a patient, comprising: a port body (102) having a discharge port (108), and a penetrable needle septum (104) that is fixed in it, defining together a camera (1 1

2.1 12A) between them that is in fluid communication with a passage (1 10) through the port of discharge (108), the camera (1 12, 1 12A) has a chamber side wall (1 18, 1 18A) and a chamber floor (1 14, 1 14A), wherein the central region of the floor of the chamber is raised with respect to the peripheral region of the floor of the chamber. camera. 2 - The venous access port (100, 100A) according to claim 1, further characterized in that the chamber floor (14) is convex in the central region.

3. The venous access port (100, 100A) according to claim 1, further characterized in that the chamber floor (1 14A) is tapered upward at a cusp (1 15) and has relatively flat inclined side surfaces ( 17) that extend to the periphery of the floor of the chamber. 4 - The venous access port (100, 100A) according to claim 3, further characterized in that the periphery of the floor of the camera (14A) is radiated to join the side wall of the camera (18A) in a tangential manner to both. 5. The venous access port (100, 100A) according to claim 1, further characterized in that the chamber floor (14 14, 14A) does not have a level portion of substantial size.