Infusion Pump Drive Head Blocking Mechanism
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Solution Overview
Problem
Existing infusion pump systems face challenges in preventing unintentional bolus administration, particularly during the process of changing infusion syringes, due to complex mechanisms and the risk of mechanical misalignment.
Innovation Solution
A drive device with a multi-part drive spindle nut and a blocking device triggered by a control sensor, which simplifies the structure and allows for automatic blocking of the drive head's infeed movement, eliminating the need for additional components like a second threaded shaft and electromagnetic brake, enabling quicker syringe changes while ensuring safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex blocking device with a second threaded shaft and electromagnetic brake is used to prevent unintentional bolus administration, then safety is improved, but device complexity increases
Solution Approach 1:
The patent combines the blocking function and drive function into a single threaded shaft and nut assembly. The nut can be in a first position allowing drive movement and a second position blocking movement, eliminating the need for separate blocking components like a second threaded shaft and electromagnetic brake while maintaining safety functionality.
Solution Approach 2:
The single threaded shaft serves multiple functions: it provides the drive mechanism for moving the drive head along the syringe barrel and simultaneously provides the blocking function when the nut is positioned in the second position. This multi-functionality reduces overall device complexity while maintaining safety.
2Productivity
If a manual feed movement mechanism is used to quickly deliver the drive head to the infusion syringe plunger, then productivity is improved, but the risk of unintentional bolus administration increases
Solution Approach 1:
The nut is designed to be movable between two positions along the threaded shaft. During manual feed, the nut is in the first position allowing free movement for quick syringe changes. When approaching the plunger, the nut can be shifted to the second position to block further movement, preventing unintentional bolus administration while maintaining operational speed.
3Reliability
If additional components like a second threaded shaft and electromagnetic brake are added to prevent bolus administration, then safety is improved, but the time required for syringe changes increases
Solution Approach 1:
By merging the blocking and drive functions into a single threaded shaft and nut assembly, the patent eliminates the time required to operate separate blocking mechanisms. The nut's position can be changed quickly during the syringe change process, preventing bolus administration without adding time to the procedure.
Data Source
AI summary
The driving apparatus (1) has a propulsion device (6) having a propulsion carriage (7), a propulsion spindle (8) and radial movable nut shells (12,13). A control sensor (25) automatically releases a blocking device to block advancing movement of a drive head (3). The propulsion carriage is driven at the propulsion spindle by a propulsion spindle nut (9). The drive head is arranged at propulsion carriage. The blocking device is automatically released by control sensor to drive the spindle nut for blocking advancing movement of the drive head at the propulsion spindle. Independent claims are included for the following: (1) infusion pump; and (2) method for operating infusion pump.