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Infusion pump device with cylinder-piston dosing unit and optical piston position detection

An optical detection and infusion pump technology, which is applied in the direction of pressure infusion, drug equipment, hypodermic injection equipment, etc., can solve the problems of reducing the stiffness of the fluid system, preventing the fluid system from being blocked or blocked, etc.

Active Publication Date: 2013-12-18
F HOFFMANN LA ROCHE & CO AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0022] A further problem caused by air in a fluid system is the reduced stiffness of the fluid system, caused by the high compressibility of gases relative to liquids such as water
This prevents detection of fluid system blockage or lockup by monitoring fluid pressure

Method used

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  • Infusion pump device with cylinder-piston dosing unit and optical piston position detection
  • Infusion pump device with cylinder-piston dosing unit and optical piston position detection
  • Infusion pump device with cylinder-piston dosing unit and optical piston position detection

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Embodiment Construction

[0122] Accurate metering of liquid medicaments is important in order to achieve low dosing errors during administration of liquid medicaments. In dosing units that allow metering of a piston pump used as a secondary container according to secondary intervals in doses of small increments by dividing the complete piston stroke into a larger number of partial strokes (as preferred in the present invention) ), which requires exact knowledge of the piston position within the cylinder at any time.

[0123] In prior art syringe-type infusion pump devices, the displacement of the piston within the main container cartridge is determined only indirectly. The drive unit motor is provided with a sensor that detects the rotation of the motor axis. Based on the number of revolutions and the known pitch of the threaded piston shaft, the displacement of the piston within the main container cartridge is determined. However, if the operative coupling between the motor and the piston shaft is ...

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PUM

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Abstract

A dosing unit (12) for an ambulatory infusion pump device (10) comprises a cylinder pump with a cylinder (14) and a piston (16) arranged in said cylinder. The piston has a shaft (18) with a first threaded segment (50) interacting with a threaded portion (54) of the cylinder, and can be displaced along a longitudinal axis (48) of the cylinder by rotating the piston in regard to the cylinder around said axis. Furthermore the piston comprises means that allow the relative or absolute determination of the longitudinal and / or rotational displacement of the piston in regard to the cylinder. In a preferred embodiment the piston shaft (18) comprises a second segment (51) provided with optically detectable markings (64, 65) that allow the monitoring of the longitudinal and / or rotational displacement of the piston in regard to the cylinder.

Description

technical field [0001] The invention relates to a dosing unit for an infusion pump device, an infusion pump device having such a dosing unit, and a method for operating such an infusion pump device according to the preambles of the independent claims. Background technique [0002] Devices for the automatic release of liquid medicaments are commonly used by patients who have a continuous and varying need over the course of the day for liquid medicaments that may be administered by infusion. Specific applications are eg some pain treatments, cancer treatments and diabetes treatments where computer controlled infusion pump devices are used. Such devices are especially useful for ambulatory therapy and are typically implemented to be attached to or near the patient's body. The medication container typically includes a supply of medication sufficient for one or more days. The liquid medicament is supplied to the patient's body from a drug container through an infusion cannula o...

Claims

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Application Information

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IPC IPC(8): A61M5/142A61M5/168A61M5/36A61M5/315A61M5/14
CPCA61M5/14216A61M5/16809A61M5/31511A61M5/365A61M2005/1402A61M2005/14208A61M2005/14264A61M2005/16868A61M2205/3306A61M2205/3355A61M2205/3365A61M2205/3396A61M5/142A61M5/168A61M5/315A61M5/14244A61M5/172
Inventor A.盖佩J.多格维尔勒U.豪伊特S.舍尤雷R.滋尔曼恩D.特尤茨奇F.科尼R.沙特格
Owner F HOFFMANN LA ROCHE & CO AG
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