Có một số phụ kiện ống thông khác hoặc các thiết bị ống thông được thiết kế chủ yếu cho sử dụng khác, tuy nhiên, là các thiết bị phụ trợ rất hữu ích cho việc thu hồi của các cơ quan nước ngoài. Các thiết bị phụ kiện thường được sử dụng kết hợp với một thu hồi đặc biệt được thiết kế thiết bị / hệ thống | CHAPTER 12 Foreign body removal Figure Needle and eye encircling a piece of catheter. carrier catheter the straight thread wire is advanced out of the carrier catheter and through the eye of the hook. The hook is then withdrawn into the carrier catheter and in turn tightens against the thread wire on the opposite side of the foreign body thus encircling and grasping the foreign body very securely Figure . The Needle s Eye snare is the strongest of the retrieval systems and the most likely to be able to dislodge securely embedded foreign bodies. This same characteristic makes this device more dangerous to use. In addition to being very large in diameter the entire system is very stiff. When the hook is extruded the wire loop of the hook is capable of digging into the tissues as well as excavating around foreign bodies. As a consequence perforations are possible both while extruding the hook and when pulling the foreign body loose. The Needle s Eye system is very strong and the grip on a foreign body is verytightandsecur ssuesaroundafoveignbody that trip itsevusaty wsSlbeas befose tOo Needie eEye meohaniem saleasos ar usvoiwabi s tihsuu-ir vreat nuugor of tearing vital tissues when extracting a foreign body forcefully with the Needle s Eye device. At the same time the Needle s Eye can be released more readily from a grasped foreign body. The hook of the device is re-advanced to loosen it the thread wire is withdrawn and then the hook can usually be withdrawn from around the foreign body. Adjunct devices for foreign body retrieval There are several other catheter accessories or catheter devices that are designed primarily for other uses which however are very useful adjunct devices for the retrieval of foreign bodies. These accessory devices are usually used in conjunction with another specifically designed retrieval device mo eommonty uemlof these adjunct devices are the bioptome forceps and the AmnSutg sontsolk l le deflectos
