# US 5,045,060 A · Implantable infusion device

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- Number: US 5,045,060 A
- Document ID: US5045060A
- Status: Granted
- Kind: A
- Application number: 07/343,914
- Filed: 1989-04-26
- Granted: 1991-09-03
- Earliest claimed: 1989-04-26
- Assignees: Therex Corp.
- Inventors: Gerald S. Melsky; Frank R. Prosl
- Web page: https://patentgrep.com/patent/US5045060A

## CPC

- A61M 39/0208: {Subcutaneous access sites (implantable infusion devices A61M5/14276; transcutaneous access sites A61M39/0247)}
- A61M 2039/0241: {having means for filtering}
- A61M: DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY (introducing media into or onto the bodies of animals A61D7/00; means for inserting tampons A61F13/26; devices for administering food or medicines orally A61J; containers for collecting, storing or administering blood or medical fluids A61J1/05); DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY (surgery A61B; chemical aspects of surgical articles A61L); DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR {(Electrotherapy, e.g. producing anaesthesia by the use of alternating or intermittent currents A61N1/36021)}

## Abstract

An improved infusion device is of the type which can be implanted for drug delivery within a patient's body, and supplied with infusate without the need for surgical removal. The infusion device has a housing forming a chamber and an entry port into the chamber. The entry port is closed by a septum. The septum has a convex top section extending from the housing, and a frusto-conical section which matingly engages a similarly shaped interior surface of the housing. The interior surface can be provided with a plurality of notches with which the septum engages by material flexure. This arrangement improves retention of the septum and operation of the infusion device, and permits advances in the method by which such devices are manufactured.

## Claims

### Claim 1

An implantable infusion device, comprising:
a rigid one-piece housing means forming an infusate chamber and including
a generally tubular wall section disposed about said chamber, said wall section having first and second axially spaced ends and an interior surface, said interior surface including a generally frustoconical portion narrower nearer said second end and a plurality of overhanging septum-retaining notches formed therealong;
a housing means wall closing said tubular wall section proximate said first end,
an entry port into said chamber proximate said second end, and
a ledge formed in said housing means intermediate said entry port and said chamber;
means for closing said entry port, said closing means including a self-sealing needle-penetrable septum of resilient material disposed on said ledge and engaging said notches by material flexure, said septum including a frustoconical wall having notches in interlocking engagement with the notches of said frustoconical wall portion so that the septum is secured at least partially within said entry port, and
means in said wall section defining a fluid outlet passage from said chamber for selectively delivering infusate therefrom.

### Claim 2 (depends on 1)

The implantable infusion apparatus of claim 1 wherein said septum is generally of a dome-like shape.

### Claim 3 (depends on 1)

The apparatus of claim 1 wherein said septum protrudes from the outer end of said passage generally following the exterior contour of said container.

### Claim 4

An implantable infusion device, comprising:
a rigid one piece housing means forming an infusate chamber and including
a generally tubular wall section disposed about said chamber, said wall section having first and second axially-spaced spaced ends and an interior surface which includes one or more septum-retaining notches formed therealong,
a housing means wall closing said tubular wall section proximate said first end,
an entry port into said chamber proximate said second end, and
a ledge formed in said housing means intermediate said entry port and said chamber;
means for closing said entry port, said closing means including a self-sealing needle-penetrable septum of resilient material said septum having an axis aligned with said port and being disposed on said ledge and engaging said notches by material flexure, said septum including a side wall having one or more notches in interlocking engagement with the notches of said wall portion so that the septum is secured at least partially within said entry port, and
means in said wall section defining a fluid outlet passage having an axis which is substantially perpendicular to said septum axis.

### Claim 5 (depends on 4)

The apparatus defined in claim 4 wherein said septum has a convex top surface extending out of said entry port appreciably beyond said housing means, said septum top surface constituting the predominant part of the surface area at the top of the infusion apparatus.