Purpose

The aims of this study were to develop an experimental procedure for setting the catheter angle with respect to the surface of the heart muscle and the catheter contact force and to investigate the catheter contact area on the heart muscle as a function of catheter contact angle and force.

Methods

Visualization tests were performed for 5 contact angles (0°, 30°, 45°, 60°, and 90°) and 8 contact forces (2, 4, 6, 10, 15, 20, 30, and 40 gf). Each experiment was repeated 6 times with 2 different commercially available catheter tips.

Results

The morphology of the contact area was classified into rectangular, circular, ellipsoidal, and semi-ellipsoidal. The correlation between contact force and contact area was a logarithmic function; increasing contact force was associated with increased contact area. At the same contact force, the correlation between contact angle and contact area was inverse; decreasing contact angle was associated with a corresponding increase in contact area.

Conclusion

Both the catheter contact angle and contact force substantially impact the contact area and morphology in catheter ablation procedures.

中文翻译：

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心导管消融中导管接触角、接触力与心肌组织表面接触面积的关系

目的

本研究的目的是开发一种实验程序，用于设置导管相对于心肌表面的角度和导管接触力，并研究作为导管接触角和力的函数的心肌上的导管接触面积.

方法

对 5 个接触角（0°、30°、45°、60° 和 90°）和 8 个接触力（2、4、6、10、15、20、30 和 40 gf）进行了可视化测试。每个实验用 2 个不同的市售导管尖端重复 6 次。

结果

接触区域的形态分为矩形、圆形、椭圆形和半椭圆形。接触力与接触面积的相关性为对数函数；接触力的增加与接触面积的增加有关。在相同的接触力下，接触角与接触面积呈负相关；接触角的减小与接触面积的相应增加有关。

结论

导管接触角和接触力都显着影响导管消融手术中的接触面积和形态。