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Actuator system comprising detector means

A technology for actuating systems and detection devices, applied in the direction of automatic injectors, instruments introduced into the body, infusion sets, etc.

Inactive Publication Date: 2007-03-28
NOVO NORDISK AS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This causes the outlet valve to close and the inlet valve to open

Method used

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  • Actuator system comprising detector means
  • Actuator system comprising detector means
  • Actuator system comprising detector means

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0107] Example 1: Viscous valve

[0108] In order to obtain a very tight valve, the seat surface and the rubber membrane are ground. This causes sticking between the seat and the membrane. This phenomenon is reflected in the duration measurement of the pumping stroke as shown in FIG. 18 .

[0109] At data points #1-15, the freshly assembled dry pump is drawing air. The valve is viscous, which is why the stroke lasts longer. At data point #16, the inlet valve is wetted, which eliminates sticking and a reduction in suction stroke duration can be seen. After a few strokes, the liquid reaches the outlet valve and has a similar effect on the duration of the outlet stroke.

example 2

[0110] Example 2: Startup detection

[0111] Figure 19 shows the duration of a series of output strokes and a series of input strokes. Data #1-5 show the fullness of the tubing connecting the pump to the skin-piercing device, which is in the form of a hollow hypodermic needle. The output stroke is faster than the input stroke because the output stroke is driven by the actuator delivering a large force compared to the input stroke, which is driven by the elasticity of the pump membrane itself. At data point #5, the fluid reached the needle (inner diameter (ID) 0.15 mm, length 40 mm), which exhibited significantly higher fluid resistance than the connecting channel between the pump and needle (inner diameter (ID) 0.50 mm). At this point, a significant increase in the output stroke duration (T-out) can be observed. No change was observed in the input stroke duration (T-in). At data point #7, the needle is completely filled, which is why the output stroke duration stabilizes at...

example 3

[0112] Example 3: Blockage detection

[0113] Figure 20 shows what happens if the inlet or outlet of the pump becomes blocked. Data points #7-11 show the duration of the discharge stroke and suction stroke when the needle of Example 2 was filled with fluid and neither the inlet nor the outlet were blocked. At data point #11, the exit was blocked. On subsequent pumping strokes, the actuator does not reach its bottom stop, or does so with considerable delay. This signal can be used for very rapid and early detection of outlet blockage. At data point #14, the outlet blockage was removed. At data point #16, the inlet was blocked. On subsequent pumping strokes, the actuator does not reach its top stop position. This signal can be used for blockage detection of the pump inlet. The latter can be used to detect that the flexible reservoir is near empty, however, in this case the rise in T-in will be insignificant and only slowly rising, but still sufficient to detect a near empt...

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PUM

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Abstract

The invention provides an actuator system comprising an actuator member having first and second positions. The system further comprises actuating means for moving the actuator member between the first and second positions and detection means for detecting the first respectively the second position and supplying time signals indicative thereof. A controller determines on the basis of supplied time signals the time lapsed when the actuator member is moved between the first and second positions in a given direction, the controller comprising information representing at least one defined time range, each time range being associated with movement of the actuator member in a given direction between the first and second positions and a given actuation force, the controller being adapted to compare the determined time lapsed with the defined time range(s) and perform an action corresponding to the time range associated with the determined time lapsed.

Description

technical field [0001] The invention relates to actuators for actuating pumps for delivering fluids. In a particular aspect, the invention relates to an actuator system adapted to actuate a membrane pump arranged in a medicament delivery device adapted to be carried by a person. However, the invention is broadly applicable in any field where a given element, component or structure moves in a controlled manner. Background technique [0002] In the disclosure of the present invention, the treatment of diabetes by injection or infusion of insulin is mainly discussed, but this is only an exemplary application of the present invention. [0003] Portable medicament delivery devices for delivering medicament to a patient are well known and typically include a reservoir adapted to hold a liquid medicament and having fluid communication with a skin penetrating device such as a hollow injection needle or cannula, and a discharge device. The discharge means are used to expel the medi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61M5/142F04B43/04F04B43/02F04B43/06F04B51/00
CPCF04B51/00F04B43/06A61M5/14224F04B43/04A61M5/14248A61M2005/14252F04B43/02A61M2005/16863F04B2201/0201A61M5/14216F04B2207/043F04B2207/70A61M5/142A61M5/20
Inventor J·H·普雷图恩O·C·尼尔森斯特芬·汉森B·G·拉森H·本特松
Owner NOVO NORDISK AS
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