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Knowledge of common medical devices

Knowledge of common medical devices

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  • Time of issue:2021-06-24
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(Summary description)Q: what are the types of commonly used thermometers?A: glass thermometer is the most common thermometer. It can keep the mercury column rising with body temperature in its original position after leaving the human body, which is convenient for users to observe at any time.

Knowledge of common medical devices

(Summary description)Q: what are the types of commonly used thermometers?A: glass thermometer is the most common thermometer. It can keep the mercury column rising with body temperature in its original position after leaving the human body, which is convenient for users to observe at any time.

  • Categories:Industry News
  • Author:
  • Origin:
  • Time of issue:2021-06-24
  • Views:0
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Q: what are the types of commonly used thermometers?
A: glass thermometer is the most common thermometer. It can keep the mercury column rising with body temperature in its original position after leaving the human body, which is convenient for users to observe at any time.
The electronic thermometer displays the body temperature in digital form by using the definite relationship between the physical parameters of some substances (such as resistance, voltage, current, etc.) and the ambient temperature.
Infrared thermometer can measure the temperature of human body non-contact by measuring the radiation temperature of ear tympanic membrane or forehead.
Electronic thermometer is made by using the principle that the resistance value of temperature sensing element (usually thermistor) changes with the change of ambient temperature. General electronic thermometer consists of four parts. The head is a temperature sensing component, the rod body is a digital temperature display, the side is a power switch button, and the end is a battery box and cover. The electronic thermometer has the advantages of intuitive reading, convenient carrying, small and novel, not easy to damage, and is easier to keep than ordinary glass thermometer.
Q: what kind of method should a thermometer master to measure body temperature?
A: the body temperature is relatively low in the early morning and slightly higher in the late evening, so there is a slight difference in the temperature measurement results within a day, which is normal.
For oral temperature measurement, put the front end of the thermometer sensing head under the tongue and press it slightly. During measurement, the mouth should be completely closed and do not speak.
Axillary temperature measurement place the thermometer sensing head at the front of the armpit parallel to the body, and the arm is close to the body to ensure that the thermometer is completely covered by the skin and is not affected by the air. The normal axillary temperature is 35.0 ~ 37.0 ℃.
For Anal temperature measurement, apply water-soluble lubricant on the front end of the thermometer, and insert the front end of the thermometer about 1.5 cm into the anus.
Before ear temperature measurement, clean the earwax or foreign matters in the ear canal, gently pull the ear back to straighten the ear canal, put the detection head into the ear canal, and press the measurement key to read the value.
Before forehead temperature measurement, clean the sweat or cosmetics near the forehead, align the temperature sensing head with the center of the eyebrow about 1 ~ 3cm, and press the measurement key to read the value.
Q: what are the types and characteristics of sphygmomanometers?
A: the mercury (mercury) sphygmomanometer has the advantages of durability, stable and accurate blood pressure measurement; The disadvantages are that it completely depends on human subjectivity, poor repeatability, accuracy depends on the experience of clinical medical staff, external noise is easy to interfere with the recognition of "Coriolis sound", and it is inconvenient to carry.
The advantages of electronic sphygmomanometer are that it does not need to master Coriolis auscultation, small and light, easy to use, low noise and no risk of mercury leakage. It is suitable for family self-test or business trip to measure blood pressure; The disadvantages are high sensitivity, poor anti-interference, and easy to be affected by the subject's body position, upper arm position, cuff wrapping position and other factors.
Barometer sphygmomanometer has the advantages of small volume, easy to carry and no risk of mercury leakage; The disadvantage is that it is difficult to ensure that the pressure measurement data is always accurate. It must be calibrated with the mercury sphygmomanometer regularly, and the reading is usually low.
Q: what should I pay attention to when using a sphygmomanometer?
A: according to the measurement results, self diagnosis and treatment are prone to risk, and doctors' guidance should be followed. In the case of common arrhythmias (such as atrial extrasystole, ventricular extrasystole, atrial fibrillation, etc.), measurement will cause errors. Do not over pressurize the cuff, otherwise it will cause blood stasis or paralysis of the arm. Patients with severe blood circulation disorders and blood diseases should be used under the guidance of doctors.
Do not use mobile phones or other devices emitting electromagnetic fields near the sphygmomanometer; Do not disassemble or transform the body or cuff of the sphygmomanometer.
Keep correct measurement posture during measurement, and measure blood pressure in a room with appropriate temperature. Rest for at least 15 minutes before measurement and at least 2 minutes for continuous measurement. After eating, drinking, smoking, exercise and shower, wait at least 30 minutes before starting the measurement.
Q: what should be paid attention to when using spirometer?
A: the tester must turn the display up, not upside down, and do not block the air outlet of the venturi.
The tester should learn to breathe deeply, avoid shrugging and lifting, and inhale slowly like smelling flowers; After learning to inhale, hold your breath and then blow at your mouth to prevent inhalation from your mouth at this time. When blowing, you should slowly force and finish it at one go, so as not to stop halfway and lock the data.
When using, handle with care to avoid collision and falling. The venturi shall be kept unblocked during the test, and any foreign matter must be eliminated. After the test, wipe the trachea with an alcohol cotton ball.
The blowing nozzle cannot be reused to prevent cross infection. The air blowing nozzle can be disinfected by washing and soaking with instrument disinfectant for 3 ~ 5 minutes. The disinfected air blowing nozzle can be washed with clean water, dried and packaged for use. When it is out of service, the battery shall be removed to prevent the battery from corroding the instrument.
Q: what is the principle of stethoscope?
A: the principle of the stethoscope is that the vibration between substances is transmitted to the aluminum film in the stethoscope, which changes the frequency and wavelength of the sound, reaches the "comfortable" range of the human ear, and shields other sounds to "listen" more clearly. The so-called "sound" is the mutual vibration transmission between substances, such as air vibration, tympanic membrane in human ears, which is transformed into brain current, and people hear the sound. The vibration frequency that human ears can feel is 20 ~ 20000 Hz.
Q: what is the function of percussion hammer?
A: all human activities, from the most primitive to the most advanced, are the result of nervous system reflex, which is the basic way of human life activities. Once there is a problem with the nervous system, there will be a pathological reflex.
Pathological reflex refers to the abnormal reflex that occurs when the central nervous system is damaged. The rubber hammer held by the doctor is used to check the patient's abnormal reflex. For example, when checking the patient's knee reflex, let the patient sit in a sitting position, relax his feet in the air, and the doctor tap his knee with a percussion hammer.
Normal people will cause the quadriceps femoris (a muscle in front of the thigh) to contract and lift the lower leg. This reflex is called the knee tendon reflex. The center of knee tendon reflex is in the spinal cord. Therefore, this examination is not to check whether there is disease in the knee, but to check whether the knee reflex of spinal cord reflex center is normal.
Biceps brachii tendon reflex, triceps brachii tendon reflex, radial membrane reflex and Achilles tendon reflex are tendon reflex like knee reflex. Under normal circumstances, tendon reflex is fed back and inhibited by the higher nervous system, so the muscles of the arm, leg and foot receiving percussion will not shrink too strong or too weak, and the examination results of bilateral reflex should be basically the same.
The knee tendon reflex on one side is weakened, which may be the lesion of efferent nerve or spinal nerve root; In alcoholic neuritis, knee tendon reflex disappeared; Sciatic nerve damage caused by lumbar disc herniation and lower limb paralysis in children will cause weakening or loss of Achilles tendon reflex; During spinal cord transverse contusion (spinal cord shock), because the spinal cord loses the management of the higher-level central nerve, it will show a temporary complete disappearance of reflex. In cerebrovascular disease, because the cerebral cortex loses control of the spinal cord and the spinal cord is in a laissez faire state, there will be hyperreflexia of tendon.
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Time of issue:2021-06-28 17:52:44

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