Abstract
Background: For the patient with chronic obstructive pulmonary disease requiring long-term oxygen therapy, oxygen concentrator machines are already widely available for use in home. In this study, we used mongrel dogs as test subjects to compare the functional efficiency and safety of the oxygen concentrator developed by our own research team with those of the imported FORLIFE(TM) machine made by AIRSEP Corp. Method and method: To test mechanical reliability, the concentrations of oxygen delivered were measured after 4 hours of continuous operation. Sixteen mongrel dogs were divided into two equal groups. Mongrel dogs in group A were given oxygen using the imported oxygen concentrator, and those in group B using the machine developed. 5 l/min of oxygen were given, after which vital signs were analyzed, arterial blood gases measured, and blood chemistry tests carried out. Results: After 4 hours of continuous operation, the imported model performed better, giving 98${\pm}$3% oxygen, compared to our model, which gave 91${\pm}$1%. In the animal experiments, oxygen concentrations were measured at the inlet of face mask 1, 2, 3, and 4 hours after continuous administration, and there was no statistically significant difference(repeated measures of analysis of variance p=0.70) between the values of 70.6${\pm}$2.5%, 67.1${\pm}$2.9%, 68.2${\pm}$2.6%, and 64.9${\pm}$3.9% that were measured from group A, and the values of 65.1${\pm}$4.8%, 65.2${\pm}$3.6%, 68.7${\pm}$4.3%, and 66.0${\pm}$5.0% measured from group B. Before oxygen administration, and at 1, 2, 3, and 4 hours after oxygen administration, arterial blood partial pressure of oxygen 87.2${\pm}$2.5 mmHg, 347.4${\pm}$29.3 mmHg, 353.4${\pm}$21.2 mmHg, 343.0${\pm}$28.8 mmHg, and 321.6${\pm}$24.4 mmHg, respectively, were read from group A, which were not statistically different (p=0.24) to the values of 102.5${\pm}$9.6 mmHg, 300.3${\pm}$17.1 mmHg, 321.6${\pm}$23.7 mmHg, 303.4${\pm}$27.4 mmHg, and 273.5${\pm}$25.9 mmHg read from group B. Nonetheless, the arterial blood partial pressure of oxygen values appear to be somewhat higher in dogs that were given oxygen using the imported oxygen concentrator. Conclusions: From these results the prototype oxygen concentrator developed appears to function relatively satisfactorily compared to the imported, established model, but may be criticized for the excessive noise generated and poor long-term endurance or consistency, which need improvement.
장기간 산소 호흡치료가 필요한 만성호흡부전증 환자에서 가정내 산소 농축기의 사용은 이미 보편화 되어있고 적응 및 사용빈도도 증가추세에 있다. 본 연구팀이 최근 개발한 국산 산소농축기의 성능검사와 보완점을 찾기위해 이미 시판되어 사용중인 외국산 산소농축기(FOR LIFE\ulcorner, Air Sep Corp. USA)와 비교 분석하여 효용성 및 안정성을 검증하고자 하였다. 기계적 성능 시험으로는 제작한 시제품과 외굿산 산소농축기를 4시간 연속 작동후 발생되는 산소농도를 측정하였으며, 동물실험은 잡견 16마리를 각 군당 8마리씩 A군, B군으로 나누어 A군은 외국산 산소농축기로, B군은 자체 개발한 산소농축기로 분당 5 리터의 산소를 공급하여 기본활력증후, 동맥혈 가스분석 및 혈액 화학 검사 등을 검사하였다. 4시간 연속 작동후 발생하는 산소 농도는 외산 98$\pm$3%, 국산 91$\pm$1 %로 외산이 우수하였다. 동물실험에서 산소 공급후 1, 2, 3, 4시간에 산소마스크 주입구에서 측정한 산소 농도는 A군에서 각각 70.6$\pm$2.5%, 67.1$\pm$2.9%, 68.2$\pm$2.6%, 64.9$\pm$3.9%, B군에서는 65.1$\pm$4.8%, 65.2$\pm$3.6%, 68.7$\pm$4.3%, 66.0$\pm$5.0%로 두 군간에 유의한 차이를 보이지 않았으며 (반복측정 분산분석 p=0.70), 산소투여 전 및 투여 후 1, 2, 3, 4 시간의 동맥혈 산소분압은 A군에서 각각 87.2$\pm$2.5 mmHg, 347.4$\pm$29.3 mmHg, 353.4$\pm$21.2 mmHg, 343.0$\pm$28.8 mmHg, 321.6$\pm$24.4 mmHg, B군에서 각각 102.5$\pm$9.6 mmHg, 300.3$\pm$17.1 mmHg, 321.6$\pm$23.7 mmHg, 303.4$\pm$27.4 mmHg, 273.5$\pm$25.9 mmHg로 비록 통계적 유의성은 없었으나(p=0.24) 외산 산소 농축기를 사용한 군에서 동맥혈 산소분압이 다소 높은 경향을 보였다. 이상으로부터 본연구팀이 현재 개발중인 국산 산소 농축기의 시제품의 성능을 시험한 결과 외산 산소 농축기와 비교하여 비교적 만족스러운 성능을 보였으나 소음, 내구성 등의 개선할 부분이 지적되었다.
