[0036] Below in conjunction with accompanying drawing, the present invention is further described:
[0037] The main structure of the phlebectomy device of the present invention is a slender tubular device, which is mainly composed of three parts: an outer cannula for removing the vein, a middle cannula for cutting the vein, and an inner cannula for injecting medicine, which are assembled in three layers in sequence.
[0038] As shown in Figures 1-4, the first part is the outer sleeve attached to the plastic handle. The outer casing is divided into three parts, the front outer casing steel pipe 13 is a stainless steel pipe, and the rear is a plastic handle. Cooperate in other ways. The outer steel pipe 13 has a certain radian, and the radian is a 7°-10° bending radian towards the inner side of the steel pipe. The edge is provided with a knife edge, and there is an opening 15 on the pipe wall at the rear end of the flaring 14. The length of the opening 15 along the length of the steel pipe is 8-10 mm, which is suitable to facilitate the extraction of the vein. The diameter of the vein removed. The rear end of the outer casing steel pipe 13 is connected with the outer casing handle 1 . The main function of the outer sleeve is to separate the vein to be excised from the surrounding tissue by using the flared flaring 14 at the front end of the outer sleeve steel tube 13 with radians and the opening 15 on the tube wall until it reaches the designated position required by the operation. The main function of the nipple 4 is to define the position of the inner sleeve, so as to play a limiting role when the injection needle is pushed back under the action of the spring.
[0039]As shown in Figures 2-4, the second part is the middle sleeve (cutter) connected to the plastic push button. The cutter steel pipe 12 at the front of the middle casing is a stainless steel pipe, and the rear is a plastic cutter handle 2 with a push button 6 installed. The push button 6 and the cutter handle 2 are connected by self-tapping screws 10. The mounting holes are closed with screw caps 9. A trumpet-shaped ring cutter 16 is welded to the front end of the cutter steel pipe 12. The maximum diameter of the ring cutter 16 is equivalent to the inner diameter of the outer steel pipe 13 and fits closely with it. The ring tool 16 is located in the opening of the outer steel pipe 13 before the operation The back of 15, so as not to hinder the extraction of the vein, extend to the opening 15 when the vein is excised, and cut off the stripped vein. The rear end of the cutter steel pipe 12 is connected with the plastic cutter handle 2 .
[0040] The upper part of the outer sleeve handle 1 is provided with a slot that is convenient for the push button 6 of the middle sleeve, the toggle 6 is exposed at the corresponding slot on the outer sleeve handle 1, and the slot is also provided with a corner along the advancing direction of the middle sleeve. α, as shown in FIG. 5 , the corner α is 135°-150°, which makes the annular cutter 16 rotate during the advancing process, so as to sufficiently cut the vein. The structure of the middle casing is completely sheathed in the structure of the outer casing, that is, the cutter steel pipe 12 is inserted into the outer casing steel pipe 13, and the cutter handle 2 of the middle casing is also set in the outer casing handle 1. The push button 6 is separated from the pipe wall of the outer casing handle 1 of the outer casing, and is connected to the cutter handle 2 of the middle casing with a self-tapping screw 10 at the groove of the pipe wall.
[0041] During the operation, when the outer cannula reaches the designated position and the separated vein needs to be cut off at this position, push the dial button 6 and push the annular cutter 16 through the opening 15 at the front end of the outer sleeve steel pipe 13, Until the dial button 6 is pushed to the bottom, at the same time, the ring-shaped cutter 16 rotates during the cutting process, so that the ring-shaped cutter 16 can ensure that the separated vein is completely cut off so that it can be separated from the body. During the operation, when the instrument does not reach the designated position, the middle cannula (cutter) cannot be moved, so there is a plastic safety pin 17 between the outer handle 1 and the push button 6 for fixing. The safety pin 17 is installed between the safety pin installation hole in the slotted rear part of the outer sleeve handle 13 and the safety pin installation hole at the bottom of the toggle button 6 . Only when the cutter needs to work, push the dial button 6 forcibly to break the safety pin, the cutter can work normally, and the operation is basically over at this time.
[0042] As shown in Figure 4, the third part is an elongated injection needle equipped with an automatic reset device. The needle tube of the injection needle is an inner sleeve steel pipe 11 made of a thin stainless steel tube, and the rear part is an inner sleeve handle 8 made of plastic, and an anesthetic syringe can be externally mounted on the inner sleeve handle 8 . The head end of the inner sleeve steel pipe 11 is flattened, and it extends to the annular cutter 16 of the middle sleeve and the back of the opening 15 on the outer sleeve steel pipe before the instrument is used, so as not to hinder the extraction of the vein. The reset device consisting of the end sleeve 7, the compression spring 5 and the spring sleeve 3 is fitted on the inner sleeve steel pipe 11, the front end of the spring sleeve 3 is pressed against the rear end of the cutter handle 2, and the front end of the spring sleeve 3 is limited. The compression spring 5 is arranged between the end sleeve 7 and the spring sleeve 3, the nipple 4 of the outer handle 1 is sleeved from the rear end of the end sleeve 7, the rear end of the end sleeve is limited, and the rear end of the end sleeve 7 is assembled into the inner sleeve Front end of handle 8. The rear of the inner sleeve handle 8 is provided with a threaded port for connecting to a syringe. During the operation, when anesthesia is required after the outer sleeve is advanced to a certain position, push the injection needle to the end, push the inner sleeve handle 8 to make the needle part exceed the head of the outer sleeve steel pipe 13, and inject anesthesia into the designated surgical site through the connected syringe , After the injection is completed, loosen the inner sleeve handle 8, the compression spring 5 drives the end sleeve 7, and pushes the inner sleeve handle 8 to automatically return to its original position.
[0043] The outer handle 1 , the socket 4 , the cutter handle 2 , the push button 6 , the inner handle 8 , the end sleeve 7 and the spring sleeve 3 of the phlebotomy device of the present invention can all be made of medical plastic and are designed to be disposable instrument.
[0044] The working process and working principle of the phlebectomy device:
[0045] At the beginning of the operation, the doctor first makes a small incision in the skin surface of the upper thigh of the patient, and finds and cuts the vein that needs to be removed. The vein head is then pulled out in the inferior direction and entered through the flared flaring 14 of the head of the phlebectomy cannula, and pulled out through the opening 15 behind the flaring 14, keeping the head of the vein outside the body at all times. At this time, the phlebotomy device is inserted under the skin from the opening of the skin of the thigh, and is advanced along the vein to be excised to separate the vein to be excised from the surrounding tissue. During this process, local anesthesia is performed 2-3 times as needed. The specific operation is to push the inner sleeve steel pipe 11 to the bottom, and inject a certain amount of anesthetic through an external syringe. After releasing, the inner sleeve automatically resets under the action of the spring. When the flaring 14 of the phlebectomy device reaches the predetermined position, push the knob 6 hard, deduce the safety pin 17, and push the cutter (inner sleeve) to the top, and the cutter will cut off the separated vein that needs to be cut. , and then pull out the cut vein that needs to be cut, pull out the phlebotomy device, and finally suture the skin incision on the thigh, and the operation is completed.
