Spirometer, more particularly an ultrasonic spirometer
First Claim
1. An ultrasonic spirometer, comprising a pair of cells, of which one is a transmitter cell and the other is a receiver cell, said cells are arranged in a test section with an oblique or perpendicular alignment to an axis of a duct containing a test section, wherein:
- a substantially sterile readily replace duct is placed with an accurate fit into the test duct, said readily replaced duct possessing at a transition to the test section a plurality of test windows wherein inserts are inserted in corresponding openings, said inserts being transparent to acoustic waves but substantially impermeable to microorganisms and dirt, wherein the substantially sterile duct has locating means for accurately fitting the same into the test duct.
2 Assignments
0 Petitions
Accused Products
Abstract
The invention relates to a spirometer, more particularly an ultrasonic spirometer, in the case of which a pair of cells, of which one is a transmitter cell and the other is a receiver cell, are arranged in a test section with an oblique or perpendicular alignment to the axis of the duct containing the test section. For this purpose in accordance with the invention a readily replaced duct, which if necessary is sterile, is inserted into the test duct. In order to design such an ultrasonic spirometer so that it may be employed for clinical purposes, it is necessary for it to be kept sterile in a simple fashion. For this purpose in accordance with the invention a sterile duct in inserted into the test duct with an accurate fit and at the transition between it and the test section it has test windows such that inserts are inserted into corresponding openings which are transparent for acoustic waves but substantially impermeable for microorganisms and dirt.
61 Citations
9 Claims
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1. An ultrasonic spirometer, comprising a pair of cells, of which one is a transmitter cell and the other is a receiver cell, said cells are arranged in a test section with an oblique or perpendicular alignment to an axis of a duct containing a test section, wherein:
a substantially sterile readily replace duct is placed with an accurate fit into the test duct, said readily replaced duct possessing at a transition to the test section a plurality of test windows wherein inserts are inserted in corresponding openings, said inserts being transparent to acoustic waves but substantially impermeable to microorganisms and dirt, wherein the substantially sterile duct has locating means for accurately fitting the same into the test duct. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. The spirometer, wherein the substantially sterile duct possesses a flange 26 with a locating recess.
Specification