Liquid drug delivery micropump

Abstract

A pump system for the subcutaneous delivery of a liquid medicament, having a pump module (10) comprising a stator housing (28) with a chamber (30), a rotor (32) rotatably and axially slidably received in the chamber and comprising a first axial extension (46) with a liquid supply channel (50) and a second axial extension with a liquid supply channel (52), the first and second axial extensions having different diameters, and first and second sealing rings (54, 56), mounted around the first and second axial extensions.

Description

technical field [0001] The present invention relates to a pump system for the subcutaneous delivery of liquid medicinal products for human use. The medical product to be delivered may specifically be insulin for diabetic patients. Background technique [0002] One approach to high-intensity insulin therapy is continuous subcutaneous insulin infusions using an extracorporeal insulin infusion pump. The portable pump is connected to the patient via a flexible tube attached to the pump at one end and to a patch with a needle for hypodermic injection at the other end. The patch typically includes an adhesive that adheres to the patient's skin. A patch with a needle is typically provided with a short length of transparent flexible tubing through which insulin is supplied to the patient, extending from the needle to a mating connector at the end of the flexible tubing extending from the insulin pump. connector. This allows the patches with needles to be replaced regularly, for ...

AI Technical Summary

Problems solved by technology

Needing to change patches at different intervals than required by insulin cartridges creates increased risk of error

[0003] Another disadvantage of existing insulin pumps is that, despite their portability, they are not light enough to be carried without causing a little discomfort and inconvenience

Also, the size of existing insulin pumps is such that they cannot be easily positioned close to the injection point

They therefore require rather long flexible drug supply tubing which presents the disadvantage of when considering the need to bleed air out of these tubing, and the cost of the tubing when it needs to be replaced

[0004] Another important disadvantage of existing insulin pumps is that they cannot pump very small volumes of fluid with sufficient precision to allow high concentrations of insulin in the cartridge to allow long cartridge change intervals and / or or reduce the size of the cartridge

The limited accuracy of conventional pumps is therefore a limiting factor in pump miniaturization and shortening the time between cartridge changes

The previously mentioned factors in turn affect the portability of the device and the risk of operator error by the patient due to the length of the supply tube and the need to replace different interconnected elements (e.g., cartridge, flexible tube, and patch with needles) high risk

Each connection and disconnection operation requires the patient to follow certain procedures and take certain precautions, all of which bear a certain risk of misuse

Images