Low Profile Venous Access Port Assembly
A venous access port assembly (10) having a housing base (28) with a discharge stem (16), a septum (14) and a cap (36). An interior reservoir (22) is defined by a well (30) in the housing base and the bottom surface of the septum, and a passageway (20) extends from the reservoir through the discharge stem (16). The cap (36) is secured to the housing base (28) and securely retains the septum in the assembly (10), compressing an annular flange (44) of the septum against a septum seat (46) of the housing base. Horizontal ribs on the interior of the cap snap into complementary grooves on the side wall of the housing base to mechanically lock together the cap and housing base during curing of the solvent bonding agent. The cap (48) is mechanically secured to the housing base (28) as well as being bonded thereto. Crush ribs (72) on the interior surface (68) of the cap (36), precisely center the cap about the housing base during assembly and compensating for manufacturing tolerances.
This application claims priority from U.S. Provisional Patent Application Ser. No. 60/936,849 filed Jun. 22, 2007.
FIELD OF THE INVENTIONThis relates to the field of medical devices and more particularly to catheter assemblies and ports therefor, for the infusion of fluids into the patient and withdrawal of fluids from the patient.
BACKGROUND OF THE INVENTIONInfusion ports for the infusion and/or withdrawal of fluids from a patient are wellknown, secured to the proximal end of an implanted catheter. These ports are typically used for drug infusion or small amounts of blood withdrawal, where large flows of fluid are not required. The ports are assemblies of a needle-impenetrable housing with a discharge port in fluid communication with the catheter and the reservoir within the port housing, and provide a subcutaneous self-sealing septum that defines an access site for multiple needle sticks through the covering skin tissue of the patient, through the septum and into the reservoir, without the need to continuously search for new access sites. Examples of such ports are disclosed, for example, in U.S. Pat. Nos. 4,704,103; 4,762,517; 4,778,452; 5,185,003; 5,213,574 and 5,637,102.
It is desired to provide a venous access port assembly that is assuredly secured together in an assuredly sealed manner.
BRIEF SUMMARY OF THE INVENTIONThe present invention is a venous access port having a housing and a septum, providing an interior reservoir and a passageway extending from the reservoir through a stem of a discharge port to establish fluid communication with a proximal end of a catheter lumen to which the port assembly is secured prior to placement of the assembly into a patient. The housing includes a base and a cap that together cooperate to secure a needle-penetrable septum within the assembly by compressing a seating flange of the septum in a seat of the housing base. The cap is mechanically secured to the housing base by a mechanical joint, preferably a retention rib of one of the housing base and cap extending radially outwardly to be received into a retention groove along the inside surface of the other of the housing base and cap in a snap fit, extending around most of the circumference of the port assembly. Preferably, solvent bonding is also provided between adjacent surfaces of the housing base and cap. The cap and housing base and septum are reduced in height from conventional ports to define a low profile venous access port assembly.
In a preferred embodiment of the present invention, a pair of horizontal retention ribs are defined on the cap's interior surface, a complementary pair of retention grooves are defined on the housing base's exterior surface. Due to manufacturing tolerances, a certain incremental “play” or gapping occurs between the facing surfaces of the cap and the housing base, and a plurality of crush ribs are provided along the interior surfaces of the cap, oriented vertically which minimize the effects of this “play.” During assembly of the cap to the housing base, the outer surface of the housing base crushes the crush ribs during the very final stages of the mechanical securing process; but the crush ribs serve to precisely center the housing base within the cap are within the incremental “play” or gapping. Just prior to mechanical assembly, solvent is applied to several selected surfaces of the housing base exterior and the cap's interior, and the crush ribs facilitate solvent wicking to the surfaces of the interface, resulting in a superior bond between the cap and the housing base.
The accompanying drawings, which are incorporated herein and constitute part of this specification, illustrate the presently preferred embodiments of the invention, and, together with the general description given above and the detailed description given below, serve to explain the features of the invention. In the drawings:
10.
Certain terminology is used herein for convenience only and is not to be taken as a limitation on the present invention. The terms “distal” and “proximal” refer, respectively, to directions closer to and away from the insertion tip of a catheter in an implantable catheter assembly. The terminology includes the words specifically mentioned, derivatives thereof and words of similar import. The embodiments illustrated below are not intended to be exhaustive or to limit the invention to the precise form disclosed. These embodiments are chosen and described to best explain the principle of the invention and its application and practical use and to enable others skilled in the art to best utilize the invention.
Venous access port assembly 10 of
With reference now to
Septum 14 is shown in
In
Housing base 28 is shown in
Cap 36 is illustrated in
A second retention section, a pair of retention ribs 70, is provided on the cap 36 around the greater part of the side surface of interior cavity 68 that corresponds with and is complementary to the first retention section or retention grooves 54 of housing base 28, discussed above with reference to
A solvent bond is preferably formed between the facing surfaces of the septum, cap and housing base. The advantages of the mechanical retention of the cap to the housing base include assured securement of the cap and the housing base, in addition to the bonding thereof. Another advantage is more efficiency in the manufacturing of the venous access port assembly, and resultant economy: since the septum flange is under compression upon and after assembly, and since bonding is performed to further secure and seal the cap to the housing base, the mechanical lock holds the cap appropriately to the housing base while simultaneously maintaining appropriate compression of the septum flange, thus eliminating the necessity of tooling fixtures that otherwise would be needed to hold the three parts together until the bonding material fully cures.
Referring in particular to
In the described embodiment, the crush ribs 72 are each positioned at an angular distance a from the longitudinal port axis on either side, such as 35°, as seen in
It will be appreciated by those skilled in the art that changes could be made to the embodiments described above without departing from the broad inventive concept thereof. It is understood, therefore, that this invention is not limited to the particular embodiments disclosed, but it is intended to cover modifications within the spirit and scope of the present invention as defined by the appended claims.
Claims
1. A venous access port assembly, comprising:
- a housing having a discharge port extending from a distal end of the port assembly, a needle-penetrable septum and a cap securable to the housing and retaining the septum securely in the assembly,
- wherein an upper surface of a housing base of the housing includes a septum seat onto which a seating flange of the septum is seated, and
- wherein the discharge port comprises a discharge stem with a pair of axially spaced ridges that facilitate mechanical connection to a catheter.
2. The venous access port assembly of claim 1, wherein a least one ridge of the pair of axially spaced ridges is rounded.
3. The venous access port assembly of claim 1, wherein a least one ridge of the pair of axially spaced ridges is annular.
4. The venous access port assembly of claim 1, wherein the housing further comprises a recess provided on each side of the discharge port to facilitate insertion of the discharge stem into a catheter lumen of the catheter.
5. The venous access port assembly of claim 4, wherein the cap further comprises a base flange extending radially outward, the base flange having a distal opening.
6. The venous access port assembly of claim 1, wherein the housing base and the cap snap-fit together.
7. The venous access port assembly of claim 1, further comprising a housing top surface that is a seat for a flange of the septum to rest thereon.
8-9. (canceled)
10. A venous access port assembly, comprising:
- a housing having a discharge port extending from a distal end of the port assembly;
- a needle-penetrable septum;
- a cap securable to the housing and retaining the needle-penetrable septum securely in the assembly, the cap further comprising a tab-receiving recess; and
- a base tab located adjacent a bottom surface of the housing base, and on a side opposite the discharge stem, that facilitates the appropriate orientation of the housing base to the cap during assembly, by cooperation with the tab-receiving recess,
- wherein an upper surface of a housing base of the housing includes a septum seat onto which a seating flange of the septum is seated, and
- wherein the discharge port comprises a discharge stem with a pair of axially spaced ridges that facilitate mechanical connection to a catheter.
11. The venous access port assembly of claim 10, wherein at least one ridge of the pair of axially spaced ridges is rounded.
12. The venous access port assembly of claim 10, wherein at least one ridge of the pair of axially spaced ridges is annular.
13. The venous access port assembly of claim 10, wherein the housing further comprises a recess provided on each side of the discharge port to facilitate insertion of the discharge stem into a catheter lumen of the catheter.
14. The venous access port assembly of claim 13, wherein the cap further comprises a base flange extending radially outward, the base flange having a distal opening.
15. The venous access port assembly of claim 10, wherein the housing base and the cap snap-fit together.
16. A venous access port assembly, comprising:
- a housing having a discharge port extending from a distal end of the port assembly;
- a needle-penetrable septum comprising flattened top surface, an annular seating flange, and rounded ridges disposed on at least one of an upper seating flange surface and a lower seating flange surface;
- a cap securable to the housing and retaining the needle-penetrable septum securely in the assembly, the cap further comprising a tab-receiving recess,
- wherein the housing has a top surface that is a seat for the annular seating flange, and
- wherein the discharge port comprises a discharge stem with a pair of axially spaced ridges that facilitate mechanical connection to a catheter.
17. The venous access port assembly of claim 16, wherein at least one ridge of the pair of axially spaced ridges is rounded.
18. The venous access port assembly of claim 16, wherein at least one ridge of the pair of axially spaced ridges is annular.
19. The venous access port assembly of claim 16, wherein the housing further comprises a recess provided on each side of the discharge port to facilitate insertion of the discharge stem into a catheter lumen of the catheter.
20. The venous access port assembly of claim 19, wherein the cap further comprises a base flange extending radially outward, the base flange having a distal opening.
21. The venous access port assembly of claim 16, wherein the housing base and the cap snap-fit together.
Type: Application
Filed: Oct 27, 2016
Publication Date: Feb 16, 2017
Inventor: Raymond Bizup (Feasterville, PA)
Application Number: 15/335,484