Method and device for identifying a change in pressure in the liquid path of a microdosing device
First Claim
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1. A device for identifying a change in pressure of a liquid in a liquid flow path associated with a microdosing device for delivering a liquid substance via a catheter to a patient, the device comprising:
- a structural part having a feed opening, a removal opening, and physical entity disposed within the part such that an interior space of the part is provided that fluidically connects the feed opening to the removal opening, wherein the feed opening supplies the liquid to the interior space of the part and the removal opening supplies the liquid to the catheter when the microdosing device is operated; and
measuring means which is operably coupled to the physical entity and detects a change to the physical entity due to a change in pressure of the liquid in the liquid flow path in-an optical, acoustic, inductive or capacitive manner, wherein the measuring means is configured to detect a projected surface of at least part of the physical entity or a change in the projected surface of at least part of the physical entity in a certain direction as a consequence of a change in pressure of the liquid by projection of a shadow image of at least part of the physical entity onto one of a photosensitive spot-type, linear or X-Y photosensor by a light source.
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Accused Products
Abstract
An insulin pump and an infusion set adapter having a membrane which can be acted upon by a liquid flow path associated with the pump, wherein the pump comprises a sensor by which a change in shape or location of at least a portion of the membrane caused by a change in the liquid pressure in the flow path can be detected in a contact-free manner to identify an occlusion in the flow path.
42 Citations
22 Claims
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1. A device for identifying a change in pressure of a liquid in a liquid flow path associated with a microdosing device for delivering a liquid substance via a catheter to a patient, the device comprising:
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a structural part having a feed opening, a removal opening, and physical entity disposed within the part such that an interior space of the part is provided that fluidically connects the feed opening to the removal opening, wherein the feed opening supplies the liquid to the interior space of the part and the removal opening supplies the liquid to the catheter when the microdosing device is operated; and measuring means which is operably coupled to the physical entity and detects a change to the physical entity due to a change in pressure of the liquid in the liquid flow path in-an optical, acoustic, inductive or capacitive manner, wherein the measuring means is configured to detect a projected surface of at least part of the physical entity or a change in the projected surface of at least part of the physical entity in a certain direction as a consequence of a change in pressure of the liquid by projection of a shadow image of at least part of the physical entity onto one of a photosensitive spot-type, linear or X-Y photosensor by a light source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification