What Are Catheters?

Cell biology term refers to the long-distance transport system of water and inorganic salts composed of columnar cells in the xylem of vascular plants. The secondary wall thickness is unevenly thickened, and the end walls are perforated or completely dissolved to form longitudinal continuous channels. It can also refer to industrial pipes and petroleum drilling pipes.

Chinese name: catheter
Foreign name: vessel
Category: Cell biology nouns

Belongs to: Transportation System
Related: Industrial Conduit and Oil Drilling Conduit
Constitute: Columnar cell

Catheter

Vessel A tubular structure that mainly conducts water and inorganic salts in the xylem of the plant. Group of highly specialized tubular dead cells

Plant duct The end walls of the cells are interconnected by perforations, and each cell is called a duct molecule or duct node. Catheter molecules are living cells in the early stages of development. After maturation, the protoplasts disintegrate and the cells die. During the maturation process, the cell wall is lignified and has different forms of secondary thickening such as ring patterns, threads, ladder patterns, reticles, and pores. At the end wall between two adjacent catheter molecules, a perforated plate is formed after dissolution. In the angiosperms, except for a few families (such as the genus Quercus and Aquatica), there are ducts; ducts also exist in some ferns (such as Selaginella, European fern) and gymnosperms of gymnosperms.

Plant duct The catheter is made up of a dead, cell-only cell, and the two cells above and below are connected. It is located in the xylem of the vascular bundle, and its function is very simple, that is, it transports water and inorganic salts absorbed from the roots to all parts of the plant body without energy.

Catheters and sieve tubes are both the plant's conducting tissue.

More evolved tree species are generally pore and reticulated ducts; more primitive species are generally ringed and threaded ducts; longer duct molecules have a smaller diameter, and shorter duct molecules have a larger diameter; fiber molecules The length is generally larger than the length of the catheter molecule, and the caliber of the fiber molecule is generally smaller than the caliber of the catheter molecule.

Conduit Industrial Conduit

Catheter definition

1 Broadly refers to the pipe used for grooming.

Industrial Conduit 2 Industrial pipes are bored cast-in-situ piles for pouring concrete pipes. Concrete pouring pipes are used for underwater pouring of large-scale bridge engineering, China Railway Engineering, highway engineering, hydropower engineering, and cast-in-situ bored piles for high-rise foundations.

Catheter specifications

It is generally convenient for construction personnel to construct. The general length of the duct is 2 meters, 2.5 meters, 2.7 meters, 3 meters, and the bottom pipe is generally 4 meters.

It is equipped with an adjustment section of 0.5 meters, 1 meter, 1.5 meters,

Catheter model

(Diameter) 219mm, 250mm, 258mm, 260mm, 270mm, 288mm, 300mm, 325mm, 377mm, 425mm, etc. Among them, the most widely used are 260mm, 300mm, etc.

Catheter structure

Each section of the catheter is composed of a circular light pipe and a catheter joint.

The structure of the catheter has several points:

1 Each section must be interchangeable

2 After docking, it must be vertical,

3 After docking, irrigation and pressurization should not leak.

4 Must have tensile strength and torque.

Industrial ducts play a great role in the construction of foundation buildings and are an indispensable tool.

Oil drilling pipe

A short section of large diameter casing is used in marshland wellsites and other specific environments; its main role is to keep the wellhead open, prevent drilling fluid from rushing out of the surface formation, and transfer the overflowing drilling fluid to the surface.