Description
The AstraGuard Filters put a tested barrier between every patient and the spirometer. Each filter is single patient use, so the turbine and tubing behind it stay out of the cleaning cycle entirely. Four styles cover the plain filter and versions bundled with SDI noseclips for a complete per patient kit.
About These Spirometry Filters
During spirometry a patient exhales forcefully into the instrument, and whatever travels with that breath reaches the flow sensor. These filters intercept that path with a woven Technostat media rated at 99.9 percent bacterial and viral efficiency in Nelson Laboratories testing. The housing keeps airflow resistance low, so the barrier does not distort the maneuver it is protecting. A comfortable oval mouthpiece shapes the seal at the lips, and the whole unit is discarded after one patient. SDI lists the line for its Astra spirometers and notes that performance exceeds ATS and ERS standards for testing.
Features and Benefits
Filtration Performance
- 99.9 percent efficiency – Nelson Laboratories testing of the Technostat filter media documents 99.9 percent bacterial and viral filtration efficiency
- Low airflow resistance – The woven media and housing keep resistance low enough that measured flows stay true
- Exceeds ATS and ERS standards – Performance goes beyond the spirometry standards the test results are judged against
Patient Handling
- Single patient use – One filter per patient removes filter reprocessing from the room turnover routine
- Oval mouthpiece – The shaped mouthpiece is comfortable to seal around during a forced maneuver
- Noseclip kit styles – Styles bundled with The Klip or Kushion Klip noseclips put the whole per patient setup in one pack
Product Specifications
Filter Details
- Filtration Efficiency: 99.9 percent bacterial and viral (Nelson Laboratories)
- Filter Media: Technostat woven filter
- Use: Single patient use
- Mouthpiece: Comfortable oval
- Standards: Exceeds ATS and ERS standards
- Country of Origin: Made in the USA
Configuration Details
- Standard Filter: 29-7990 in 50, 100, 200 and 300 packs
- With The Klip Noseclip: 29-7991 in 50, 100 and 200 packs
- With Kushion Klip Noseclip: 29-7996 in 50 and 100 packs
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Why Choose the AstraGuard Filters?
Infection control is the reason spirometry filters exist, and this line documents its efficiency with independent laboratory testing. The kit styles go a step further by bundling the noseclip, so the per patient setup comes out of one pack.
- Documented efficiency – the 99.9 percent figure comes from Nelson Laboratories testing, not from an in house estimate
- Protects the instrument – keeping patient effluent out of the turbine extends sensor life and removes a cleaning burden
- Kit convenience – noseclip bundled styles cut room setup to a single pack opening, a differentiator over filter only lines
- True measurements – low resistance media protects the barrier without taxing the maneuver
Manuals and Troubleshooting Guides
Frequently Asked Questions
How efficient is the filtration?
The Technostat filter media is rated at 99.9 percent bacterial and viral efficiency in testing performed by Nelson Laboratories, and the final report is linked in the documents section of this listing.
Are these filters reusable?
No. They are single patient use filters, discarded after one patient so no reprocessing is needed between tests.
What is the difference between the styles?
The standard style is the filter alone. The other styles bundle the filter with an SDI noseclip, either The Klip or the Kushion Klip, in the same pack.
Which spirometers do they fit?
SDI lists these filters across its Astra spirometer line, and their low resistance design suits routine spirometry testing generally.
Is this the genuine SDI product?
Yes. These are genuine SDI Diagnostics filters under manufacturer part numbers 29-7990, 29-7991 and 29-7996, made in the USA.
