| 摘要 |
Tracheostomies can be formed by means of a hollow needle inserted through a scalpel cut into the trachea. In the present invention, the needle has a sharply pointed tip and is joined at its rear end to a plastics hub. The length of the needle from the hub is greater than the thickness of neck tissue but less than the distance between the skin surface and the posterior wall of the trachea. The hub has a laterally extending face which has an area at least fifty times the cross sectional area of the needle. Two parallel walls with stepped edges provide a gripping region far the hub, enabling it to be gripped between the finger and thumb. The needle is inserted by means of a loss of resistance device in the form of a syringe the nose of which is coupled in a tapered recess in the hub. When the plunger of the syringe can be displaced along its barrel, this indicates that the tip of the needle has entered the trachea.
|
