Application of new dosing plates and scrapers

Quantitative plates are the standard method recommended by the World Health Organization for quantitative examination of parasite eggs in feces, and are also commonly used in the current examination of eggs. In 1974, a round hole slab was designed as a quantitative tool, which is common throughout the world.

The application of quantitative plates and scraping strips (ie, modified Kato smear method) to examine various intestinal worm eggs is an effective method for checking and counting the eggs of modern eggs. Quantitative plates and scrapers are necessary tools for this operation.

First, the quantitative plate, scraper design specifications

1. The material is polystyrene.

2. The size of the quantitative plate is 30*40*1.37mm; the grinding hole is a round hole, the volume of the hole is 38.74mm3, and the two holes are spaced apart by 4.5mm; there is a protrusion on one side of the plate.

Second, in 1988, 1996, and 2002, the quantitative plate was improved three times . *Improved In 1988, the calibration plate specification was improved*, and the circular orifice calibration plate was changed to the elliptical orifice quantitative plate. The ellipse consists of a rectangle and two semicircles. The elliptical hole has a long diameter of 7.9 mm, a short diameter of 4 mm, a plate thickness of 1.37 mm, and a volume of 38.59 mm3.

2. The second improvement was made in 1996 to improve the specification of the quantitative plate. The elliptical hole quantitative plate is a 40*30*1mm polystyrene template with an elliptical hole with a semicircle at both ends. The diameter is 11 mm, the short diameter is 3.8 mm, and the volume is 38.7 mm3.

3. The third improvement In 2002, the specification of the quantitative plate was improved. The circular plate-shaped hole quantitative plate was designed. The central hole on the polystyrene of size 40*30*1mm was changed to a truncated cone shape with a long diameter of 4 mm and a short diameter of 3mm, the volume is 38,75mm3, and the weight of the feces is 41.67mg. The circular hole surface with a small diameter should be regarded as the front side and placed upwards.

4. Summary * The improved plate size is designed to be elliptical, which makes up for the defects of the previous round hole on the rectangular slide to suppress the excretion of the fecal sample, which improves the operability, the second improvement. The post-quantity plate pore volume tends to increase the accuracy of the round hole dosing plate volume produced in Brazil. After the third modified quantitative plate hole operation, the fecal sample can easily pass through the plate hole without adhering to the hole wall, thereby reducing the error of the manure caused by the operation, and obtaining a more accurate egg count and infection degree value. .

According to incomplete statistics, the number of used quantitative plates in the national parasitic disease prevention and control work has reached several million sets. The improved dosing plate not only improves the quality of parasitic eggs, but also reduces the cost of detection and is widely used.

At present, the quantitative plates used at home and abroad are made of ABS tanning materials. A large number of tasting plates are discarded after use, forming white garbage and polluting the environment. With the environment of harmony between human and nature, green and low-carbon environmental protection is advocated. The concept, protection and purification of the environment is also an important issue for human survival in the 21st century. Therefore, it is still necessary to improve the materials for the production of quantitative plates and replace the ABS industrial materials with green and environmentally-friendly degradation materials.