The intelligent level of the modern medical equipments is higher than before and the automatic calibration circuits are largely used. The control circuit of the intelligent equipments is quite complicated and its working modes have been simplified to four-terminal or double terminal nets. The intelligent medical equipments such as CT, MRI, DR, PET/ CT have more chances to have some "soft" errors that are usually related to the zero-line calibration. In actual use, it can be noticed and performed, and the detecting and servicing for the medical equipments can be much easier than before.

As the base for the healthy development of civil medical equipment industry,the independent developing ability has attracted extensive attention.Firstly,medical equipment enterprises were divided into 5 modes according to their independent developing ability.Then the fuzzy evaluation method was utilized to evaluate them so as to correctly know the independent developing ability of medical equipment industry in our country.The evaluation shows that the brand value of the civil medical equipment is generally low.

Objective To observe the effect of Fuming Tablet on the content of ATP and MDA, and the activity of SOD in retinal tissue of rabbit retinal detachment (RD) and reattachment model. Methods 48 rabbits were randomly divided into 4 groups, with 12 in each. 12 rabbits were taken as healthy control and fed with normal saline, the others in model group, western medicine group and Fuming Tablet group were prepared as RD model by injecting Sodium Halyuronate (Helen) into subretinal spaces, and the detached retinas were reattached automatically in 10 ～ 14 days. They were administered with normal saline, mixed preparation of western medicines and Fuming Tablet suspension respectively, then the content of ATP, MDA and SOD activity were determined in postoperative 1 week (the retina remained detached) and 3 weeks (the detached retina reattached). Results Effect of fuming tablet of increasing the content of ATP and the activity of SOD, reducing the content of MDA was similar with that of the mixed preparation of ATP, VitB1 and Venoruton. Conclusion Fuming Tablet can significantly improve the oxidation resistance and depress the lipid peroxidation of retinal tissue, thus alleviate and inhibit the development of retinal pathological changes to some extent.

Objective To collect data and analyze the current status and prevalence changes of Crohn's disease (CD) in mainland China in recent decades. Methods A computer-based literature search was previously performed by using 50-year (1950 to 2002) of records of CD from the Chinese Database of Biology and Medicine (CBM) (1979 to 2002) and a manual year-by-year search of the literature ( 1950 to 1978). Using similar method, descriptive epidemiological data from 2003 to 2007 were collected, analyzed and compared with previous research. Results Four hundred and seventeen relevant papers during 2003 and 2007 were collected and 62 papers were eligible for inclusion. Within 62 papers, a total of 2149 cases with CD from 2003 to 2007 have been reported nationwide, comprising 1288 male and 861 female patients, result (ie,1526 cases from 1950-2002). There were no obvious changes in incidence age (younger and middle age were main components) and sex ratio ( number of male was still larger than that of female). The extrapolated CD incidence and prevalence rates were 1.21/100 000 person ? year and 2.29/100 000, respectively, which were higher than that of year 1950-2002, 0.28/100 000 person ? year and 1.38/ 100 000, respectively. Conclusions The incidence and prevalence rates of CD have been increasing rapidly, but these rates are still lower than those in Western world.

Objective To study the risk factors and pathogenesis of pulmonary infection in acute stroke patients. Methods A retrospective analysis was taken in 257 acute stroke cases to investigate the incidence of pulmonary infection and its relationship with the underlying disease, disturbance of consciousness, invasive operation,the type of pathogenic bacteria and drug susceptibility. Results The positive rate of pulmonary infection in acute stroke patients was high and related to many factors including severity of stroke, disturbance of consciousness,primary diseases, and invasive examination etc. The most popular infective bacteria were Gram-negative bacteria. The imipenem was most sensitive to Gram-negative and Gram-positive bacteria, followed by Amikacin and piperacillin too. Conclusions The pulmonary infection in cerebral stroke patients is caused by many factors, of which Gramnegative bacteria play the most important role. Identification of the risk factor and pathogenic bacteria is helpful in treating cerebral stroke infectious complications.

Objective To evaluate the value of the short-segment nerve conduction studies (SSCSs, inching test) in the diagnosis and localization of cubital tunnel syndrome (CubTS).Methods The clinical and electrophysiologic data of 46 patients (92 limbs from 32 men and 14 women, aged from 19 to 59 years, with average age of 41.2 years) with CubTS were collected.The symptoms occurred in unilateral arm in 41 patients and bilateral arms in 5 patients, involving 35 left arms and 16 right arms.SSCSs were performed in both arms in all the 46 patients.Sixty ulnar nerves were studied in 30 healthy control subjects using SSCSs.Results The 51 symptomatic arms with CubTS were abnormal in long segment motor nerve conduction studies.There were 68 abnormal arms ( 51 symptomatic arms, 17 asymptomatic arms ) in SSCSs.The lesions were located 2 cm proximal to the elbow-the elbow segment ( AE2-E ) in 41 arms (44.6%),the elbow-2 cm distal to the elbow segment (E-BE2) in 23 arms (25%), 4 cm proximal to the elbow-2 cm proximal to the elbow segment (AE4-AE2) in 18 arms (19.6%), 6 cm proximal to the elbow-4 cm proximal to the elbow segment (AE6-AE4) in 9 arms (9.8%), 2 cm distal to the elbow-4 cm distal to the elbow segment (BE2-BE4) in 8 arms(8.6%) and 4 cm distal to the elbow-6 cm distal to the elbow segment (BE4-BE6) in 6 arms(6.5%),respectively.Conclusions SSCSs are more sensitive in detecting CubTS than the conventional long segment motor conduction studies.SSCSs could precisely localize the entrapment lesions in patients with CubTS ,might be a useful tool for the detection of ulnar mononeuropathy at the elbow, especially for diagnosing the patients with CubTS who have no clinical features or have a normal long segmental nerve conduction findings.

In this study, to analyze the influence of the brightness value of the supranasal point and the apex nasi on their dominant wavelength and excitation purity according to the spectrocolorimetry data of the supranasal point and the apex nasi in healthy adults that were collected based on optical spectrum colorimetry.

The quality control methods are the important to improve the exactness of diagnses and the effectivity of treatment.X-ray imaging quality is an important factor in improving the X-ray diagnosis effect.To serve this purpose,medical engineering personnel should do the X-ray quality control regularly to keep every parameter in accordance with national standards and demands.The quality control methods for several important indexes of X-ray generators are also discussed.[Chinese Medical Equipment Journal,2008,29(2):99-101]

Ambulance is a kind of new medical technique vehicle along with the development of medical science.Many countries are developing new ambulances in order to satisfy the demand of the emergency highway accident rescue.The GPS communication system and the vehicular medical power design are the most important parts of the ambulances for their complicated technology.This article discusses these two problems.

The two important methods for displaying three-dimensional data called surface rendering and volume rendering are introduced and analyzed.It is concluded that volume rendering is superior to surface rendering for the former one provides a basis for visualization of three-dimensional data.