PICC tube blockage thrombolysis three-way auxiliary device

Abstract

The present invention relates to a three-way auxiliary device for PICC tube blockage and thrombolysis, comprising a three-way valve, a drug delivery syringe, and a negative pressure aspirator. The negative pressure aspirator comprises an aspirator and an adapter. The aspirator comprises a cylinder shell with a piston cylinder cavity and a piston assembly. The front end of the cylinder shell is connected to the adapter and the rear end is exhausted. The rubber cup of the piston assembly is slidably matched in the piston cylinder cavity of the cylinder shell and is pulled by a suction handle to evacuate the air seal and pushed by a reset spring to reset and exhaust the air. The adapter comprises an adapter tube with a one-way valve cavity inside. One end of the adapter tube is plugged and matched with the gas nozzle seal to form a one-way valve cavity connected to the gas nozzle. The adapter tube connects the gas nozzle and the three-way valve of the cylinder shell. The one-way valve cavity of the adapter tube is provided with a valve seat sheet with a hole in the center. The valve seat sheet with the hole cooperates with a movable core. The movable core comprises a positioning guide rod. One end of the positioning guide rod has a conical rubber plug with a hole for closing and opening the valve seat sheet. The negative pressure aspirator has a reasonable structure and has the advantages of being easy to operate and carry.

Description

Technical Field

[0001] The invention relates to a medical device, in particular to a PICC tube blocking and thrombolysis three-way auxiliary device. Background Art

[0002] Peripherally inserted central catheters (PICCs) have the advantages of long retention time, reduced pain from repeated punctures, and reduced stimulation and damage to blood vessels by chemotherapy drugs or hypertonic fluids, so they are widely used in patients undergoing chemotherapy for cancer. However, PICC catheters are relatively slender, and the course of treatment for cancer patients spans a long time. The treatment drugs are highly irritating, and the incidence of catheter blockage is high. If not handled in time, it will lead to unplanned extubation, interruption of treatment, and increase the patient's pain and economic burden.

[0003] In order to solve the problem of complete blockage of PICC, thrombolysis treatment is required clinically. Existing thrombolysis auxiliary equipment usually includes a three-way valve, a dosing syringe, and a suction syringe. One of the tube heads of the three-way valve is connected to the end of the PICC tube, urease is extracted from the dosing syringe and connected to the three-way valve, and another empty suction syringe is connected to the three-way valve; when in use, the suction syringe and the PICC tube end are connected by the three-way valve, and the suction syringe is emptied to form a negative pressure in the PICC catheter. At this time, the handle of the suction syringe needs to be manually pulled to ensure negative pressure, and the three-way valve is switched to connect the dosing syringe and the PICC catheter. The urease in the dosing syringe is injected into the PICC catheter by negative pressure, and the catheter is retained for 15 to 30 minutes and then aspirated. If it is not unblocked, the above actions are repeated until it is unblocked again, and then the catheter is pulse-flushed with 20ml of normal saline.

[0004] Existing thrombolysis assisting devices rely on traditional syringes to draw negative pressure. During the suction, medical staff need to pull and hold the needle handle to ensure the formation of negative pressure. The operation process is relatively cumbersome and laborious. Since the above operation needs to be performed every 1 to 2 hours in clinical practice, the workload of medical staff is large and the damage to the palm is great. Frequent operation can easily cause swelling of the palm of the medical staff, causing great work pressure on the medical staff. There are also electric vacuum devices in existing medical devices, but they are large in size, inconvenient to carry and expensive. Summary of the invention

[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a PICC tube occlusion and thrombolysis three-way auxiliary device with a reasonable vacuum structure design, convenient vacuum operation and easy to carry.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A PICC tube blockage and thrombolysis three-way auxiliary device, comprising a three-way valve, three pipe joints of the three-way valve are respectively connected to a drug injection syringe, a negative pressure aspirator and a catheter joint for connecting a PICC tube end, characterized in that: the negative pressure aspirator comprises an aspirator and an adapter, the aspirator comprises a cylinder shell with a piston cylinder cavity and a piston assembly, the front end of the cylinder shell is provided with an air nozzle connected to the adapter, the rear end of the cylinder shell is provided with an exhaust port connected to the piston cylinder cavity, the piston assembly comprises a rubber cup and an exhaust handle, the rubber cup is slidably matched with the piston cylinder cavity, and the piston assembly is provided with a gas nozzle connected to the piston cylinder cavity. In the piston cylinder cavity of the cylinder shell, the rubber bowl has a tapered annular side wall, the small end of the annular side wall faces the air nozzle of the cylinder shell, the annular side wall is elastically attached to the piston cylinder cavity wall when the rubber bowl moves away from the air nozzle, and the annular side wall can be detached from the piston cylinder cavity wall when the rubber bowl moves toward the air nozzle to form an air gap for gas to pass through, the linear sliding guide of the air pumping handle is matched on the cylinder shell, the air pumping handle is provided with a rubber bowl mounting seat, the rubber bowl is fixedly mounted on the rubber bowl mounting seat, and the other end of the air pumping handle opposite to the end connected to the rubber bowl is extended The operating end of the piston cylinder cavity is provided with a return spring on the vacuum handle for driving the rubber cup to move one end toward the air nozzle. The return spring is arranged in the piston cylinder cavity, one end of the return spring abuts against the rubber cup mounting seat, and the other end of the return spring abuts against the rear end surface of the piston cylinder cavity. The adapter includes an adapter tube, and a one-way valve cavity is provided in the adapter tube. One end of the adapter tube is plugged in and matched with the air nozzle to form a one-way valve cavity connected to the air nozzle. The other end of the adapter tube is provided with a plug nozzle plugged into the pipe joint of the three-way valve. The one-way valve cavity of the adapter tube faces one end of the plug nozzle. A valve seat plate with a hole in the center is provided, and a movable core is inserted in the adapter tube. The movable core includes a positioning guide rod. A guide hole is provided on the end of the adapter tube that cooperates with the air nozzle. The positioning guide rod is slidably guided in the guide hole. The positioning guide rod and the guide hole are gap-matched. The positioning guide rod extends into the one-way valve cavity. A conical rubber plug is provided at one end of the positioning guide rod. The tip of the conical rubber plug is arranged toward the valve seat plate. The tip of the conical rubber plug can be inserted into the hole of the valve seat plate to form a conical rubber plug to seal and block the hole of the valve seat plate.

[0008] The working principle of the PICC tube blocking and thrombolysis three-way auxiliary device of the present invention is as follows: use and installation, the connection and installation of the PICC tube end, the drug administration syringe and the adapter are realized through the three-way valve, and the installation is completed by connecting the air nozzle of the aspirator to the adapter; forming a negative pressure for drug administration, switching the three-way valve to make the PICC catheter and the adapter connected, pulling and pulling the air extraction handle, pulling the rubber cup to realize air extraction, and applying negative pressure to the PICC tube through the adapter and the three-way valve. After one pulling and pulling is completed, under the action of the reset spring, the air extraction handle and the rubber cup are reset and moved. In this process, the movable core in the adapter is formed to push the gas in the reverse direction and the negative pressure formed by the end of air extraction is formed. The tip of the conical rubber plug is quickly inserted into the hole of the valve seat sheet to realize the conical rubber plug blocking the hole of the valve seat sheet, thereby ensuring that the negative pressure in the PICC tube is maintained, and the required negative pressure can be formed in the PICC tube by repeated suction; negative pressure drug administration, switching the three-way valve to make the PICC tube and the drug administration syringe connected, and injecting the drug body (urease) into the PICC tube under the action of negative pressure to dissolve the thrombus. Keep it for 15 to 30 minutes before performing the suction action. If it is still blocked, repeat the above operation until it is unblocked. The negative pressure for drug administration of the PICC tube blocking and thrombolysis three-way auxiliary device of the present invention can be formed by multiple air extractions, which ensures the reliability of drug administration and improves efficiency. In addition, a one-way conduction effect is formed under the action of the adapter during air extraction, and the operator does not need to maintain the pulling state, which is simpler and more labor-saving. When air is extracted, the reset spring can achieve rapid reset of the rubber bowl, and the rapid reset of the rubber bowl can form a reliable reverse thrust to ensure that the conical rubber plug blocks the holes of the valve seat sheet, ensuring that the negative pressure in the PICC tube remains reliable. When the PICC catheter is connected, the drug administration syringe can be removed, and another one with physiological saline can be taken to flush the tube. The aspirator has a simple and compact structure, is easy to carry and store, and has low cost.

[0009] Preferably, a spherical expansion portion is provided between the adapter tube and the plug nozzle, and the spherical expansion portion has a spherical cavity with a diameter larger than the inner diameter of the adapter tube.

[0010] With this structural design, when blood is drawn back, the spherical cavity can play a role of accommodating and buffering, thereby preventing the returned blood from flowing out of the adapter and causing contamination to the aspirator.

[0011] Preferably, a negative pressure indicating mechanism is further provided between the spherical expansion part and the adapter tube, the negative pressure indicating mechanism comprises an intermediate connecting tube connecting the spherical expansion part and the adapter tube, the intermediate connecting tube is radially provided with a branch tube connected thereto, the branch tube is a negative pressure indicating tube with a scale, a barrel-shaped rubber bag is provided in the branch tube, the bottom of the rubber bag is spherical crown-shaped, the bottom of the rubber bag faces the intermediate connecting tube, the mouth of the rubber bag is fixed on the branch tube, and the mouth of the rubber bag is sealed with the branch tube.

[0012] With this structural design, during the process of pumping negative pressure, the negative pressure in the middle connecting tube causes the rubber bag to extend in the branch tube, cooperating with the branch tube to indicate the negative pressure value, making it easier to judge the timing of drug administration.

[0013] Preferably, the upper end of the branch pipe is provided with a fixed plug head which presses the mouth of the rubber bag onto the branch pipe, the plug head has a through cavity connected to the inner cavity of the rubber bag, a closed push rod is inserted into the through cavity of the plug head, and the closed push rod comprises a rod-shaped body, a spherical head with a diameter matching the diameter of the middle connecting pipe is provided at the lower end of the rod-shaped body, the spherical head is placed in the rubber bag, a locking barb is provided in the middle of the rod-shaped body, the upper end of the rod-shaped body is a pushing end for axial movement of the pushing rod-shaped body, and the locking barb stopper cooperates with the through cavity At the outer port of the cavity, the rod-shaped body can be deformed to pass through the lower port of the middle through cavity of the plug when it moves axially toward the middle connecting tube, and then be engaged with the lower end of the plug. The spherical head on the rod-shaped body forms a top-pressure rubber bag bottom that is attached to the wall of the middle connecting tube when the locking barb is engaged with the lower end of the plug. The plug is also provided with a protective cavity located above the middle through cavity and connected with it. The pushing end of the rod-shaped body is placed in the protective cavity, and the top of the protective cavity has a protective opening that blocks the pushing end of the rod-shaped body and allows the pushing end of the rod-shaped body to be exposed.

[0014] With this structural design, after the thrombus is dissolved, the rubber bag can be pushed toward the middle connecting tube by the sealing push rod to achieve sealing, further preventing the blood from returning out of the adapter and causing contamination to the aspirator. The locking barbs of the rod-shaped body can maintain the position of the sealing push rod, and the protective cavity can protect the sealing push rod to prevent misoperation.

[0015] Preferably, it also includes a push plug for extending into the protective cavity to push the pushing end of the push rod body, and a receiving portion for placing the push plug is provided on the cylinder shell of the aspirator.

[0016] With this structural design, a top plug for pushing the top pressure rod body is carried on the suction device, which is convenient for operation.

[0017] Preferably, the conical rubber plug is of hollow design and includes a conical body and a tubular extension. The large end of the conical body is connected to the tubular extension. The tubular extension has a snap ring extending radially inward relative to the other port connected to one end of the conical body. An annular snap groove is provided on the positioning guide rod, and the snap ring is sleeved on the annular snap groove.

[0018] This structural design is conducive to the elastic deformation of the conical rubber plug, ensuring that the conical rubber plug can reliably block the hole and ensure reliable one-way sealing.

[0019] Preferably, the radial cross-section of the vacuum handle is polygonal, and the rear end of the cylinder shell has a polygonal positioning hole adapted to the vacuum handle. At least one surface corresponding to the polygonal surface of the vacuum handle is provided with a groove extending along the length direction of the vacuum handle, and the groove and the polygonal positioning hole wall are spaced apart to form the exhaust port.

[0020] This structural design makes the structure compact.

[0021] The present invention will be further described below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural schematic diagram of a three-way auxiliary device for PICC tube clogging and thrombolysis according to a specific embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the structure of a negative pressure aspirator according to a specific embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the structure of an aspirator according to a specific embodiment of the present invention;

[0025] Figure 4 An exploded view of a rubber cup and a vacuum handle assembly according to a specific embodiment of the present invention;

[0026] Figure 5 for Figure 2 A partial enlarged view of part A. DETAILED DESCRIPTION

[0027] See attached Figures 1 to 5The present invention discloses a PICC tube blockage and thrombolysis three-way auxiliary device, comprising a three-way valve 1, wherein the three pipe joints of the three-way valve 1 are respectively connected to a drug-administering syringe 2, a negative pressure aspirator 3, and a catheter joint 11 for connecting a PICC tube end, wherein the negative pressure aspirator 3 comprises an aspirator 31 and an adapter 32, wherein the aspirator 31 comprises a cylinder shell 311 having a piston cylinder cavity 3111 and a piston assembly, wherein the front end of the cylinder shell 311 is provided with an air nozzle 312 connected to the adapter 32, and the rear end of the cylinder shell 311 is provided with an exhaust port 3112 connected to the piston cylinder cavity 3111, wherein the piston assembly comprises a rubber bowl 313 and an exhaust handle 314, wherein the rubber bowl 313 is slidably fitted in the piston cylinder cavity 3111 of the cylinder shell 311, and the rubber bowl 313 has a conical The annular side wall 3131, the small end of the annular side wall 3131 faces the air nozzle 312 of the cylinder shell 311, the annular side wall 3131 is elastically attached to the wall of the piston cylinder cavity 3111 when the rubber bowl 313 moves away from the air nozzle 312, and the annular side wall 3131 can be detached from the wall of the piston cylinder cavity 3111 when the rubber bowl 313 moves toward the air nozzle 312 to form an air gap for gas to pass through, the air extraction handle 314 is linearly slidably guided on the cylinder shell 311, and a rubber bowl mounting seat 315 is provided on the air extraction handle 314, the rubber bowl 313 is fixedly mounted on the rubber bowl mounting seat 315, and the rubber bowl mounting seat 315 includes a first clamping seat 3151 and a second clamping seat 3152, and a threaded sleeve 31511 is provided at the center of the first clamping seat 3151, The second clamping seat 3152 is provided with a socket hole that is sleeved on the outside of the threaded sleeve 35511, and the rubber cup 313 is clamped between the first clamping seat 3151 and the second clamping seat 3152. The threaded sleeve on the first clamping seat 3151 is threadedly screwed on the vacuum handle 314. The other end of the vacuum handle 315 opposite to the end connected to the rubber cup 313 is an operating end extending out of the piston cylinder cavity 3111. A transverse handle is provided on the operating end so that the vacuum handle 314 forms a T-shape. A frame-shaped gripping portion 3113 of the transverse handle surrounding the vacuum handle 314 is provided on the cylinder shell 311. This facilitates the vacuum operation. A return spring 316 is installed on the vacuum handle 314 to drive one end of the rubber cup 313 to move toward the air nozzle 312. The return spring 316 is arranged in the piston cylinder cavity In 3111, one end of the return spring 316 abuts against the rubber bowl mounting seat 315, and the other end of the return spring 316 abuts against the rear end surface of the piston cylinder cavity 3111. The adapter 32 includes an adapter tube 321, and a one-way valve cavity 3211 is provided in the adapter tube 321. One end of the adapter tube 321 is sealed and plugged with the air nozzle 312 to form a one-way valve cavity 3211 that is connected to the air nozzle 312. In order to ensure a reliable sealing connection between the air nozzle and the adapter, the air nozzle can be designed with a rubber sleeve. The other end of the adapter tube 321 is provided with a plug-in nozzle 322 (a traditional syringe needle tube seat design can be adopted) plugged with the pipe joint of the three-way valve 1. The one-way valve cavity 3211 of the adapter tube 321 is provided with a valve seat sheet 323 with a hole 3231 in the center toward the plug-in nozzle 322.A movable core is inserted into the transfer tube 321, and the movable core includes a positioning guide rod 324. A guide hole 3212 is provided at one end of the transfer tube 321 that matches the air nozzle 312. The positioning guide rod 324 is slidably guided and matched in the guide hole 3212. The positioning guide rod 324 and the guide hole 3212 are gap-matched. The positioning guide rod 324 extends into the one-way valve cavity 3211. A conical rubber plug 325 is provided at one end of the positioning guide rod 324. The tip of the conical rubber plug 325 is arranged toward the valve seat sheet 323. The tip of the conical rubber plug 325 can be inserted into the hole 3231 of the valve seat sheet 323 to form a conical rubber plug 325 that seals and blocks the hole 3231 of the valve seat sheet 323.

[0028] The working principle of the PICC tube blocking and thrombolysis three-way auxiliary device of the present invention is as follows: use and installation, the connection and installation of the PICC tube end, the drug administration syringe and the adapter are realized through the three-way valve, and the installation is completed by connecting the air nozzle of the aspirator to the adapter; forming a negative pressure for drug administration, switching the three-way valve to make the PICC catheter and the adapter connected, pulling and pulling the air extraction handle, pulling the rubber cup to realize air extraction, and applying negative pressure to the PICC tube through the adapter and the three-way valve. After one pulling and pulling is completed, under the action of the reset spring, the air extraction handle and the rubber cup are reset and moved. In this process, the movable core in the adapter is formed to push the gas in the reverse direction and the negative pressure formed by the end of air extraction is formed. The tip of the conical rubber plug is quickly inserted into the hole of the valve seat sheet to realize the conical rubber plug blocking the hole of the valve seat sheet, thereby ensuring that the negative pressure in the PICC tube is maintained, and the required negative pressure can be formed in the PICC tube by repeated suction; negative pressure drug administration, switching the three-way valve to make the PICC tube and the drug administration syringe connected, and injecting the drug body (urease) into the PICC tube under the action of negative pressure to dissolve the thrombus. Keep it for 15 to 30 minutes before performing the suction action. If it is still blocked, repeat the above operation until it is unblocked. The negative pressure for drug administration of the PICC tube blocking and thrombolysis three-way auxiliary device of the present invention can be formed by multiple air extractions, which ensures the reliability of drug administration and improves efficiency. In addition, a one-way conduction effect is formed under the action of the adapter during air extraction, and the operator does not need to maintain the pulling state, which is simpler and more labor-saving; when air is extracted, the reset spring can achieve rapid reset of the rubber bowl, and the rapid reset of the rubber bowl can form a reliable reverse thrust to ensure that the conical rubber plug blocks the holes of the valve seat sheet, ensuring that the negative pressure in the PICC tube remains reliable. When the PICC catheter is connected, the drug administration syringe can be removed, and another one with physiological saline can be taken to flush the tube. The aspirator has a simple and compact structure, is easy to carry and store, and has low cost. Greatly reduces the workload of medical staff.

[0029] The radial cross-section of the suction handle 314 is a polygon, and in this specific embodiment, it is a quadrilateral. The rear end of the cylinder shell 311 has a polygonal positioning hole adapted to the suction handle 314. At least one surface of the corresponding polygonal surface on the suction handle 314 is provided with a groove 3141 extending along the length direction of the suction handle 314. The groove 3141 and the polygonal positioning hole wall are spaced and matched to form the exhaust port 3112. In this way, the exhaust is achieved during the suction process while ensuring reliable positioning and matching between the suction handle and the cylinder shell, and the structure is compact.

[0030] A spherical enlarged portion 326 is provided between the adapter tube 321 and the plug nozzle 322. The spherical enlarged portion 326 has a spherical cavity 3261 with a diameter larger than the inner diameter of the adapter tube. When blood is drawn back, the spherical cavity can play a role of accommodating and buffering, preventing the blood from flowing out of the adapter and causing contamination to the aspirator. At the same time, the spherical enlarged portion 326 facilitates the holding position of the adapter and the air nozzle of the aspirator 31 for plugging and unplugging operations, making the operation more convenient.

[0031] A negative pressure indicating mechanism is also provided between the spherical expansion part 326 and the transfer tube 321. The negative pressure indicating mechanism includes an intermediate connecting tube 327 connecting the spherical expansion part 326 and the transfer tube 321. The intermediate connecting tube 327, the spherical expansion part 326 and the transfer tube 321 are integrally formed. The intermediate connecting tube 327 is radially provided with a branch tube 328 connected thereto. The branch tube 328 is a negative pressure indicating tube with a scale. A barrel-shaped rubber bag 329 is provided in the branch tube 328. The bottom of the rubber bag 329 is spherical crown-shaped. The bottom of the rubber bag 329 faces the intermediate connecting tube 327. The mouth of the rubber bag 329 is fixed on the branch tube 328. The mouth of the rubber bag 329 is sealed with the branch tube 328. During the process of pumping negative pressure, the rubber bag is stretched in the branch tube under the negative pressure in the intermediate connecting tube 327, and the negative pressure value is indicated in cooperation with the branch tube, so as to facilitate the judgment of the timing of drug administration.

[0032] The upper end of the branch pipe 328 is provided with a fixed plug 320 for pressing the mouth of the rubber bag 329 onto the branch pipe 328. The plug 320 has a through cavity 3200 connected to the inner cavity of the rubber bag 329. A closed push rod 32-1 is inserted into the through cavity 3200 of the plug 320. The closed push rod 32-1 includes a rod-shaped body 32-11. The lower end of the rod-shaped body 32-11 is provided with a spherical head 32-12 whose diameter matches the diameter of the middle connecting pipe 327. The spherical head 32-12 is placed in the rubber bag 329. The middle part of the rod-shaped body 32-11 is provided with a locking barb 32-13. The upper end of the rod-shaped body 32-11 is a pushing end for axial movement of the pushing rod-shaped body 32-11. The locking barb 32-13 stops The rod-shaped body 32-11 is matched with the outer port of the middle through cavity 3200, and the rod-shaped body 32-11 is axially moved toward the middle connecting tube, and can be deformed to pass through the lower port of the middle through cavity 3200 of the plug head, and then snapped with the lower end of the plug head 320. When the locking barb 32-13 is snapped with the lower end of the plug head 320, the spherical head 32-12 on the rod-shaped body 32-11 forms a top-pressing rubber bag 329, and the bottom is attached to the wall of the middle connecting tube 327. The plug head 320 is also provided with a protective cavity 3201 located above and connected to the middle through cavity 3200. The push end of the rod-shaped body 32-11 is placed in the protective cavity 3201, and the top of the protective cavity 3201 has a protective opening that blocks the push end of the rod-shaped body 32-11 and allows the push end of the rod-shaped body 32-11 to be exposed. After the thrombus is dissolved, the rubber bag can be pushed toward the middle connecting tube by the closed push rod to achieve closure, further preventing the blood from returning out of the adapter and causing contamination of the aspirator. The locking barbs of the rod-shaped body realize the position maintenance of the closed push rod, and the protective cavity realizes the protection of the closed push rod to prevent misoperation.

[0033] To facilitate the above operation, a top plug 4 is provided for extending into the top push end of the top push rod body 32-11 in the protective cavity 3201, and a receiving portion for placing the top plug 4 is provided on the shell 311 of the aspirator 31. The receiving portion can be a jack, and the top plug for pushing the top push rod body is carried on the aspirator for convenient operation.

[0034] In this specific embodiment, the conical rubber plug 325 is hollow, and includes a conical body 3251 and a tubular extension 3252. The large end of the conical body 3251 is connected to the tubular extension 3252. The tubular extension 3252 has a snap ring 3253 extending radially inward relative to the other end connected to the conical body 3251. The positioning guide rod 324 is provided with an annular groove 3241, and the snap ring 3253 is sleeved on the annular groove 3241. This is conducive to the elastic deformation of the conical rubber plug, ensuring that the conical rubber plug can reliably block the hole and ensure reliable one-way sealing.

Claims

1. A three-way auxiliary device for PICC tube blockage and thrombolysis, comprising a three-way valve, wherein the three pipe joints of the three-way valve are respectively connected to a drug administration syringe, a negative pressure aspirator and a catheter joint for connecting the PICC tube end, characterized in that: The negative pressure suction device comprises a suction device and an adapter. The suction device comprises a cylinder shell with a piston cylinder cavity and a piston assembly. The front end of the cylinder shell is provided with an air nozzle connected to the adapter. The rear end of the cylinder shell is provided with an exhaust port connected to the piston cylinder cavity. The piston assembly comprises a rubber cup and a suction handle. The rubber bowl is slidably fitted in the piston cylinder cavity of the cylinder shell, the rubber bowl has a conical annular side wall, and the small end of the annular side wall faces the air nozzle of the cylinder shell. The annular side wall is elastically attached to the piston cylinder cavity wall when the rubber bowl moves away from the air nozzle, and the annular side wall can be detached from the piston cylinder cavity wall when the rubber bowl moves toward the air nozzle end to form an air gap for gas to pass through. The linear sliding guide of the air pumping handle is fitted on the cylinder shell, and the air pumping handle is provided with a rubber bowl mounting seat, and the rubber bowl is fixedly mounted on the rubber bowl mounting seat. The other end of the air pumping handle opposite to the end connected to the rubber bowl is an operating end extending out of the piston cylinder cavity, and a return spring driving the rubber bowl to move one end toward the air nozzle is mounted on the air pumping handle. The return spring is arranged in the piston cylinder cavity, one end of the return spring abuts on the rubber bowl mounting seat, and the other end of the return spring abuts on the rear end surface of the piston cylinder cavity, and the adapter includes an adapter tube, The adapter tube is provided with a one-way valve cavity, one end of the adapter tube is sealed and plugged with the air nozzle to form a one-way valve cavity connected to the air nozzle, the other end of the adapter tube is provided with a plug nozzle plugged with the pipe joint of the three-way valve, the one-way valve cavity of the adapter tube is provided with a valve seat sheet with a hole in the center facing the plug nozzle, a movable core is inserted in the adapter tube, the movable core includes a positioning guide rod, a guide hole is provided at one end of the adapter tube that cooperates with the air nozzle, the positioning guide rod is slidably guided in the guide hole, the positioning guide rod is gap-matched with the guide hole, the positioning guide rod extends into the one-way valve cavity, one end of the positioning guide rod is provided with a conical rubber plug, the tip of the conical rubber plug is arranged toward the valve seat sheet, the conical rubber plug The tip of the valve can be inserted into the hole of the valve seat sheet to form a conical rubber plug to seal and block the hole of the valve seat sheet; a spherical expansion part is provided between the transfer tube and the plug nozzle, and a spherical cavity with a diameter greater than the inner diameter of the transfer tube is provided in the spherical expansion part; a negative pressure indicating mechanism is also provided between the spherical expansion part and the transfer tube, and the negative pressure indicating mechanism includes an intermediate connecting tube connecting the spherical expansion part and the transfer tube, and the intermediate connecting tube is radially provided with a branch tube connected thereto, and the branch tube is a negative pressure indicating tube with a scale, and a barrel-shaped rubber bag is provided in the branch tube, and the bottom of the rubber bag is in a spherical crown shape, and the bottom of the rubber bag faces the intermediate connecting tube, and the mouth of the rubber bag is fixed on the branch tube, and the mouth of the rubber bag is sealed and matched with the branch tube;The upper end of the branch pipe is provided with a fixed plug which presses the mouth of the rubber bag onto the branch pipe, the plug has a through cavity connected to the inner cavity of the rubber bag, a closed push rod is inserted in the through cavity of the plug, the closed push rod comprises a rod-shaped body, a spherical head with a diameter matching the diameter of the middle connecting pipe is provided at the lower end of the rod-shaped body, the spherical head is placed in the rubber bag, a locking barb is provided at the middle part of the rod-shaped body, the upper end of the rod-shaped body is a pushing end for axial movement of the pushing rod-shaped body, the locking barb stopper is matched at the outer end of the through cavity, and can be deformed to pass through the lower end of the through cavity of the plug when the rod-shaped body moves axially toward the middle connecting pipe, and then is clamped with the lower end of the plug, The spherical head on the rod-shaped body forms a top-pressing rubber bag bottom attached to the wall of the middle connecting tube when the locking barb is engaged with the lower end of the plug head. The plug head is also provided with a protective cavity located above and connected to the middle through cavity. The push end of the rod-shaped body is placed in the protective cavity. The top of the protective cavity has a protective opening that blocks the push end of the rod-shaped body and allows the push end of the rod-shaped body to be exposed. The radial cross-section of the suction handle is polygonal, and the rear end of the cylinder shell has a polygonal positioning hole that matches the suction handle. A groove extending along the length direction of the suction handle is provided on at least one face of the suction handle corresponding to the polygonal face, and the groove and the polygonal positioning hole wall are spaced and matched to form the exhaust port. ; 2. According to claim 1, the PICC tube blockage thrombolysis three-way auxiliary device is characterized by: It also includes a push plug for extending into the pushing end of the push rod body in the protective cavity, and a receiving portion for placing the push plug is provided on the cylinder shell of the aspirator.

3. According to claim 1, the PICC tube blockage thrombolysis three-way auxiliary device is characterized by: The conical rubber plug is hollow in design and comprises a conical body and a tubular extension. The large end of the conical body is connected to the tubular extension. A clamping ring is radially extended inwardly from the tubular extension portion relative to the other port connected to one end of the conical body, an annular clamping groove is arranged on the positioning guide rod, and the clamping ring is sleeved on the annular clamping groove.

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