Blood Purification Apparatus Needle Insertion Verification
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Solution Overview
Problem
It is difficult to determine if arterial and venous puncture needles are appropriately inserted into a patient's access vessel during blood purification treatments, leading to improper extracorporeal circulation and potential complications.
Innovation Solution
A blood purification apparatus equipped with a pressure-change-producing device, a pressure-change-detecting device, and an evaluation device that applies and detects pressure changes in the blood circuit to verify the correct insertion of puncture needles before initiating blood circulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the puncture needle is manually inserted into the access vessel without verification, then the blood purification treatment can proceed quickly, but the reliability of proper needle insertion cannot be ensured
Solution Approach 1:
The patent replaces manual visual verification of needle insertion with an automated pressure detection system. Pressure sensors automatically detect pressure changes in the blood circuit when the needle is properly inserted into the access vessel, eliminating the need for manual assessment and providing objective verification of insertion quality.
Solution Approach 2:
The system performs self-verification by automatically detecting pressure changes that occur when the puncture needle is properly inserted into the access vessel. The blood purification apparatus itself monitors its own setup status through pressure sensors, without requiring external verification tools or manual inspection.
2Productivity
If the blood pump is activated without verifying needle insertion, then the treatment starts immediately, but improper circulation may occur
Solution Approach 1:
The patent implements preliminary verification of needle insertion by detecting pressure changes before the blood pump is activated. The system checks whether the puncture needle is properly inserted into the access vessel by monitoring pressure variations in the blood circuit, ensuring correct setup before initiating blood circulation.
Solution Approach 2:
The system provides feedback about needle insertion status by detecting pressure changes in the blood circuit. This feedback mechanism allows the blood purification apparatus to confirm proper needle placement before activating the blood pump, preventing improper circulation while maintaining efficient treatment initiation.
3Measurement precision
If no pressure detection system is used, then the device remains simple, but the state of needle insertion cannot be accurately evaluated
Solution Approach 1:
The patent utilizes hydraulic principles by detecting pressure changes in the blood circuit that occur when the puncture needle is properly inserted into the access vessel. Pressure sensors monitor the hydraulic pressure variations caused by needle insertion, providing precise evaluation of insertion status through non-invasive pressure measurement.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Ensures that blood is safely and effectively extracorporeally circulated by accurately evaluating the state of needle insertion, preventing inappropriate sticking and ensuring proper blood flow during treatment.
Implementation Method 1
a pressure-change-producing device configured to apply a positive pressure or a negative pressure to a distal portion of the blood circuit
Implementation Method 2
a pressure-change-detecting device configured to detect a pressure change in the distal portion of the blood circuit
Data Source
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AI summary
The present invention provides a blood purification apparatus capable of assuredly preventing the blood of a patient from being extracorporeally circulated through a blood circuit with a puncture needle being inappropriately stuck in an access vessel. A blood purification apparatus according to the present invention includes a blood circuit (1) through which blood of a patient extracorporeally circulate, and a dialyzer (2) that purifies the blood flowing in the blood circuit (1). The apparatus further includes a pressure-change-producing device capable of applying a positive pressure or a negative pressure to distal portions of the blood circuit (1) while an arterial puncture needle (a) and a venous puncture needle (b) are yet to be connected to the blood circuit (1), a pressure-change-detecting device capable of detecting pressure changes in the distal portions of the blood circuit (1) that occur when the distal portions of the blood circuit (1) that are under the positive pressure or the negative pressure applied by the pressure-change-producing device are connected to the arterial puncture needle (a) and the venous puncture needle (b) that are stuck in the patient, and an evaluation device (11) capable of evaluating a state of sticking of the arterial puncture needle (a) and the venous puncture needle (b) on the basis of the pressure changes detected by the pressure-change-detecting device.