Characteristics of multi-layer coating formed on commercially pure titanium for biomedical applications.

An innovative multi-layer coating comprising a bioactive compound layer (consisting of hydroxyapatite and calcium titanate) with an underlying titanium oxide layer (in the form of anatase and rutile) has been developed on Grade 4 quality commercially pure titanium via a single step micro-arc oxidation process. Deposition of a multi-layer coating on titanium enhanced the bioactivity, while providing antibacterial characteristics as compared its untreated state. Furthermore, introduction of silver (4.6wt.%) into the multi-layer coating during micro-arc oxidation process imposed superior antibacterial efficiency without sacrificing the bioactivity.

A comparative cost analysis study of lobectomy performed via video-assisted thoracic surgery versus thoracotomy in Turkey.

INTRODUCTION: Cost analysis studies performed in western countries report that the overall cost of lobectomies performed via video-assisted thoracic surgery is similar to or less than those performed via thoracotomy. The situation may be different in a developing country. AIM: We evaluated the cost differences of these two surgical methods. MATERIAL AND METHODS: We retrospectively reviewed the hospital records of 81 patients who underwent lobectomy either via video-assisted thoracic surgery (n = 32) or via thoracotomy (n = 49). Patient characteristics, pathology, perioperative complications, additional surgical procedures, length of hospital and intensive care unit stay, and outcomes of both groups were recorded. Detailed cost data for medications, anesthesia, laboratory, surgical instruments, disposable instruments and surgery cost itself were also documented. Statistical analyses were performed to compare the groups. RESULTS: The two groups were homogeneous in regard to age, sex, pathology and perioperative morbidity. The mean duration of hospitalization in the video-assisted thoracic surgery group was significantly shorter than that of the thoracotomy group (7.78 ±5.11 days vs. 10.65 ±6.57 days, p < 0.05). Overall final mean cost in the video-assisted thoracic surgery group was significantly higher than that of the thoracotomy group ($3970 ±1873 vs. $3083 ±1013, p = 0.002). This significant difference relies mostly on the cost of disposable surgical instruments, which were used much more in the video-assisted thoracic surgery group than the thoracotomy group ($2252 ±1856 vs. $427 ±47, p < 0.05). CONCLUSIONS: In contrast to western countries, a video-assisted thoracic surgical lobectomy may cost more than a lobectomy via thoracotomy in a developing country. More expensive disposable surgical instruments and cheaper hospital stay charges lead to higher overall costs in video-assisted thoracic surgical lobectomy patients.