Ngược lại, một đoạn rộng hơn sẽ tạo ra sự hỗn loạn và bong bóng do đó lớn hơn. Bất kể sự tập trung của sclerosant, tỷ lệ khí là khoảng 0,7-0,83. Tessari của phương pháp sản lượng bọt, rất tốt-bọt khí nhỏ, đó là chất lỏng nếu nồng độ thấp của sclerosant được sử dụng hoặc nhớt | 156 Jonith Breadon 8 spectively. The outlets of the two syringes are connected to a three-way stopcock. Pumping the contents of the two syringes back and forth 20 times causes a turbulent flow that generates foam 15 . The three-way stopcock can vary the size of the bubbles by changing the size of the passageway. By turning the cock a narrow passage can generate high turbulence and conse quently smaller bubbles. Conversely a wider passage will generate less turbulence and therefore larger bubbles. Regardless of the concentration of the sclerosant the gas proportion is approximately . Tessari s method yields a very fine small-bubbled foam which is fluid if low concentrations of sclerosant are used or viscous if high concentrations are used 15 18 Sclerotherapy Chapter 8 157 Fig. . a Left Omnifix syringe right shaded Injekt syringe. Preparation I sterile filtration of air. The Steri-fix sterile filter is first screwed onto the three-part 10-ml Omnifix syringe for sterile filtration of ambient air step 1A and an exact amount of 8 ml ambient air is drawn up in accordance with the graduation of the syringe barrel step 1B . A hygienically proper procedure is mandatory. Preparation II drawing up of Aethoxysklerol. Afterward the Sterifix sterile filter is removed and 1 ampoule of Aethoxysklerol 3 is drawn up completely 2 ml as usual into the same syringe using a sterile disposable cannula step 1C . The inadvertent drawing up of additional sterile air is to be avoided. Preparation III assembling the dual syringe system. The Combidyn adapter is first firmly connected to the filled Omnifix syringe step 2A then to the Injekt syringe step 2B by rotation in order to assemble the dual syringe system. Personal communication from . . b Left Omnifix syringe right shaded Injekt syringe. Foam generation I mixing phase. The foam generation is performed in two phases In the first mixing phase Aethoxysklerol 3 and sterile air are mixed to obtain
