| 摘要 |
<p>An embryo transfer catheter or other medical device has a shaft 1 extruded with two layers 12 and 13. The outer layer 13 is relatively thick and contains gas bubbles 22 sufficient to increase the visibility of the catheter under ultrasound observation but with a density that allows material within the catheter to be viewed by the eye. The inner layer 12 is relatively thin and is free of bubbles so that it provides a smooth bore 10 to the catheter. <IMAGE></p> |
