From the perspective of traditional Chinese medicine, blood vessels are blocked by blood stasis, so the Chinese medicine that opens blood vessels is the Chinese medicine that has the function of promoting blood circulation and breaking blood. Commonly used Chinese herbal medicines for promoting blood circulation and removing blood stasis include Rhizoma Corydalis, Curcuma Rhizome, Radix Curcumae, Olibanum, Carthami Flos, Semen Persicae, Herba Leonuri, Radix Cyathulae, Caulis Spatholobi, Radix Salviae Miltiorrhizae, Radix Paeoniae Rubra, Rhizoma Chuanxiong, Cortex Moutan, Radix Notoginseng, and Fructus Crataegi. Traditional Chinese medicines, such as Rhizoma Sparganii, Rhizoma Bambusae, Hirudo, Lumbricus, Scolopendra, etc., have strong effects of breaking blood and resolving stagnation. Qi deficiency leads to blood stasis, so congestion is closely related to qi deficiency. We generally invigorate qi while promoting blood circulation, such as adding Radix Astragali and Ginseng. Commonly used Chinese patent medicines with the functions of promoting blood circulation and removing blood stasis include compound Danshen tablets, safflower tablets, Xuesaitong capsules, Xuefu Zhuyu capsules, Sanqi tablets and so on. These should be applied under the guidance of a doctor. These drugs have obvious effects of promoting blood circulation, removing blood stasis, softening blood vessels, improving microcirculation and ensuring blood supply to cardiovascular and cerebrovascular diseases. Clinically, it is mainly used to treat coronary heart disease and cerebral blood supply deficiency caused by blood stasis, and generally can achieve good results.

Blood vessels refer to a series of pipes through which blood flows. In addition to cornea, hair, nails, dentin and epithelium, blood vessels are all over the body. According to the different structures and functions of blood vessels, they can be divided into three types: arteries, veins and capillaries. The artery starts from the heart and branches continuously, with smaller diameter and thinner wall. Finally, it is divided into a large number of capillaries, which are distributed in tissues and cells of the whole body. Capillaries rejoin, forming veins step by step and finally returning to the heart. Blood vessels, arteries and veins are pipelines for conveying blood, capillaries are places where blood and tissues exchange materials, arteries and veins are connected through the heart, and blood vessels in the whole body form closed pipelines. The distribution of blood vessels in human body is often symmetrical, which is suitable for function. Great blood vessels are often parallel to the long axis of the body and are wrapped by connective tissue membranes into vascular nerve bundles with nerves.

Second, blood vessels are the pipelines for organisms to transport blood, which can be divided into arteries, veins and capillaries according to the transport direction. Arteries bring blood from the heart to the body tissues, veins bring blood from the tissues back to the heart, and capillaries connect arteries and veins, which are the main places for material exchange between blood and tissues. All living things have different types of blood vessels. Open-circulating organisms, such as insects, have only arteries. Blood automatically flows out of the pulse, directly contacts the body tissue, and then recovers blood from the opening in the heart. Organisms with closed circulation, such as mammals, birds, reptiles and fish, are connected to capillaries through arteries, then to veins and finally back to the heart.

3. The vascular system consists of the arterial system originating from the ventricle, the venous system flowing back to the atrium and the reticular capillaries connected between the arteries and veins. Blood shoots from the ventricle, flows into the atrium through arteries, capillaries and veins, and circulates endlessly. According to the different circulation routes, it can be divided into two types: large (systemic circulation) and small (pulmonary circulation). The circulation of great vessels starts from the left ventricle, and the contraction of the left ventricle pumps arterial blood rich in oxygen and nutrients into the aorta, reaches the capillaries of various tissues in the whole body through arterial branches at all levels, and exchanges substances with tissue cells, that is, oxygen and nutrients in blood are absorbed by tissue cells, and metabolites and carbon dioxide of tissue cells enter the blood to form venous blood. Then it passes through various veins and finally flows into the superior and inferior vena cava and into the right atrium.