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Device for detection of a change of pressure in a canal of a microdosing device

A technology of fluid channel and metering device, which is applied in the direction of measuring fluid pressure, measuring fluid pressure through electromagnetic components, measuring devices, etc. It can solve the problems of large dispersion of accuracy and achieve the effect of improving measurement accuracy and reducing inaccuracy

Inactive Publication Date: 2009-02-18
F HOFFMANN LA ROCHE & CO AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the elements that come into contact with the fluid are in most cases designed as disposables for hygienic reasons, but the sensor has to be used several times for cost reasons, the micrometering devices known today have the following disadvantages, That is, the accuracy of pressure measurement has a lot to do with the quality of the mechanical coupling between the components in contact with the fluid and the sensor. Therefore, when determining the tolerance of a disposable product, the cost is reasonable but the accuracy is comparable when repeated measurements large dispersion

Method used

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  • Device for detection of a change of pressure in a canal of a microdosing device
  • Device for detection of a change of pressure in a canal of a microdosing device
  • Device for detection of a change of pressure in a canal of a microdosing device

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Embodiment Construction

[0055] from figure 1 The basic structure of the micrometering device according to the invention can be seen, which shows a side view of a portable insulin pump 1 for the time-controlled delivery of insulin into a patient via an infusion device 21 , 22 . The infusion set 21 , 22 is designed as a disposable product and comprises an adapter 21 and a catheter 22 which form the patient-side fluid channel 2 of the insulin pump 1 . The adapter 21 comprises a plastic film 7 (shown in dashed lines) inside which is acted upon by the fluid in the fluid channel 2 . When the fluid pressure in the fluid channel 2 increases, for example due to a blockage in the conduit 22 , this plastic film 7 bends in the direction of the pump housing 20 of the feed pump and thus forms the claimed entity 3 . When the fluid pressure in the fluid channel 2 changes, the shape of the entity 3 changes. In order to detect the change in shape due to the bowing of the membrane 7, the insulin pump 1 is provided wi...

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Abstract

The invention relates to an insulin pump (1) with an infusion set adapter (21) having a diaphragm (7) exposed to the liquid path (2). Arranged in the housing (20) of the insulin pump (1) is a measurement arrangement comprising emitter (4) and sensor (5), by means of which a bowing of the diaphragm (7) following a change in the liquid pressure in the liquid path (2) can be detected without contact, for recognizing an occlusion in the liquid path (2). This yields the advantage that an accurate and delay-free occlusion recognition with low system cost becomes possible.

Description

technical field [0001] The invention relates to a method for detecting pressure changes in a fluid channel of a micrometering device according to the preambles of the independent claims, the use of such a method, a device for carrying out such a method, a A micro metering device having such a device, and applications of the device or the micro metering device. Background technique [0002] When finely dosing fluid substances with microliter precision, such as in the pharmaceutical and chemical industries, and especially in medicine when administering liquid medicines, such as insulin, to a patient's body, it is of the utmost importance to precisely maintain the desired dosing and to detect it immediately and eliminate inadvertent infusion interruptions, such as due to empty fluid containers or blockages in fluid pathways. [0003] It is known from the prior art that in insulin pumps with a screw-driven delivery piston, the driving torque or bearing force of the screw is mon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N7/00A61M5/168
CPCA61M2005/16868A61M2205/3355A61M2205/3375A61M2205/3306G01L9/0077A61M5/16854A61M2005/16863A61M5/14244
Inventor U·豪特D·博斯哈德I·休特施T·鲁弗H·-P·斯托勒
Owner F HOFFMANN LA ROCHE & CO AG
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