Nasal Irrigation Sampling for Comfortable Self-Collected Specimens
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Solution Overview
Problem
The nasopharyngeal swab method for COVID-19 and other respiratory tract infections is invasive, painful, and poses a risk to healthcare workers, leading to low patient acceptance and inefficiencies in diagnostic testing.
Innovation Solution
A nasal specimen collection apparatus with a nasal pathway irrigator and collector, using fluid irrigation to dislodge samples from the nasal pathway, which are then recaptured in a collection chamber and transferred to a sample tube, minimizing invasiveness and infection risk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If nasopharyngeal swab is used for specimen collection, then viral concentration in sample is improved, but patient comfort and acceptance deteriorate
Solution Approach 1:
The patent employs fluid irrigation (hydraulic principle) to flush the nasopharyngeal cavity and dislodge viral particles from mucosal surfaces. A controlled stream of irrigation fluid is delivered through a catheter to mechanically detach and mobilize the sample, replacing the mechanical swabbing action with a fluid-based approach that is less traumatic to patient tissues.
Solution Approach 2:
The patent replaces the traditional mechanical swabbing system with a fluid delivery and recovery system. Instead of using a rigid or flexible swab applicator that mechanically contacts and rotates in the nasopharynx, the invention uses a fluid catheter that delivers irrigation solution and a separate collection mechanism that retrieves the fluid-carried sample, substituting mechanical contact with fluid-mediated sample acquisition.
2Measurement precision
If nasopharyngeal swab is used for specimen collection, then diagnostic accuracy is improved, but infection risk to healthcare workers worsens
Solution Approach 1:
The patent enables self-administration of the specimen collection procedure. The patient independently inserts the catheter into their own nasopharynx, activates the irrigation fluid delivery, and completes the sample collection without requiring a healthcare worker to perform the invasive maneuver. This eliminates direct contact between the healthcare worker and the patient's respiratory secretions during the procedure.
Solution Approach 2:
The patent extracts the healthcare worker from the direct sample collection process. By designing a self-administered system, the procedure removes the need for a healthcare worker to physically insert the catheter, manipulate the swab, or handle the sample at the patient's bedside, thereby extracting the source of potential transmission risk from the procedure itself.
3Ease of operation
If alternative collection methods are used to improve patient comfort, then patient acceptance is improved, but sampling adequacy deteriorates
Solution Approach 1:
The patent applies preliminary irrigation action to the nasopharyngeal cavity before sample collection. The irrigation fluid is delivered first to pre-loosen and mobilize viral particles adhering to the mucosal surfaces, creating a suspension that is easier to recover. This preliminary flushing action ensures that when the collection phase occurs, adequate viral material is already dislodged and mixed with the irrigation fluid for efficient recovery.
Solution Approach 2:
The patent discards the traditional swab applicator and recovers the irrigation fluid that now contains the dislodged sample. Instead of using a disposable swab that requires insertion and rotation, the system discards the need for mechanical contact and recovers the fluid-carried sample through a collection chamber or suction mechanism, achieving both patient comfort and sampling adequacy.
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
The apparatus allows for comfortable, self-administered specimen collection with reduced risk to healthcare workers, achieving sufficient pathological sampling comparable to nasopharyngeal swabs.
Implementation Method 1
directing fluid into the nasal pathway in order to dislodge a sample from within the nasal pathway
Implementation Method 2
the collection chamber has an outer rim that is configured to interface with the nasal pathway. The collection chamber also defines a collection path for recapturing at least a portion of the fluid that was directed into the nasal pathway
Data Source
AI summary
A nasal specimen collection apparatus comprises: a nasal pathway irrigator including an irrigation chamber that defines an irrigation path for directing fluid into a nasal pathway to dislodge a sample from within the nasal pathway; a nasal sample collector including a collection chamber that surrounds the nasal pathway irrigator, wherein the collection chamber has an outer rim that is configured to interface with the nasal pathway, and wherein the collection chamber defines a collection path for recapturing at least a portion of the fluid to collect the sample that was dislodged from within the nasal pathway; and an annular shell that surrounds the nasal sample collector with an annular cavity formed in between the annular shell and the collection chamber, wherein the annular shell is configured to interface with a sample tube so that contents of the collection chamber can be emptied into the sample tube.