Overmolded septum

Patent metadata

Field	Value
Publication number	US-12427248-B2
Application number	US-202117350853-A
Country	US
Kind code	B2
Filing date	Jun 17, 2021
Priority date	Dec 19, 2018
Publication date	Sep 30, 2025
Grant date	Sep 30, 2025

Abstract

Disclosed is a pierceable septum for use in drug reservoirs and infusion sets. The pierceable septum has an elastic core made from a core material and a surround made from a surrounding material. The surrounding material is more rigid than the core material. The elastic core is fully embedded in the surround.

First claim

What is claimed is:

1. A pierceable septum for use in drug reservoirs and infusion sets, the pierceable septum comprising:
an elastic core formed from a core material; and
a surround formed from a surrounding material;
wherein, the elastic core is fully embedded in the surround and the surrounding material is more rigid than the core material;
further wherein the surround comprises first and second different surrounding materials, wherein the first surrounding material is disposed along a piercing path of a cannula and the second surrounding material is disposed aside from the piercing path, further wherein the first surrounding material is less rigid than the second surrounding material.

2. The pierceable septum according to claim 1 , wherein the surrounding material has a shore hardness selected from the group consisting of: from 0 to 100 Shore A and from 50 to 80 Shore A.

3. The pierceable septum according to claim 1 , wherein the core material has a shore hardness selected from the group consisting of from 0 to 50 Shore A and from 10 to 40 Shore A.

4. The pierceable septum according to claim 1 , wherein the elastic core is overmolded by the surround.

5. The pierceable septum according to claim 1 , wherein the core material is an elastomer.

6. The pierceable septum of claim 1 , wherein the surrounding material is an elastomer or thermoplastic elastomer.

7. The pierceable septum according to claim 1 , wherein the elastic core is radially pre-stressed by the surround.

8. The pierceable septum according to claim 1 , wherein the septum comprises a sealing lip or a circumferential groove.

9. An infusion set comprising a pierceable septum according to claim 1 .

10. The infusion set according to claim 9 , wherein the septum is radially prestressed by radial compression.

11. A reservoir for a liquid drug comprising a pierceable septum according to claim 1 .

12. The reservoir according to claim 11 , wherein the septum is radially prestressed by radial compression.

Assignees

• Roche Diabetes Care Inc

Inventors

• Kreidemacher Oliver
• Lebau Olaf

Classifications

• B29C45/561

  Injection-compression moulding · CPC title

• B29C45/1711

  and removing excess material from the mould cavity by the introduced fluid, e.g. to an overflow cavity · CPC title

• A61M2205/0216

  Materials providing elastic properties, e.g. for facilitating deformation and avoid breaking · CPC title

• A61M2039/027

  having a particular valve, seal or septum · CPC title

• A61M2039/0072

  Means for increasing tightness of the septum, e.g. compression rings, special materials, special constructions · CPC title