Blood vessel access smoothness detector for hemodialysis

Abstract

The invention provides a blood vessel access smoothness detector for hemodialysis. The blood vessel access smoothness detector comprises an injector, a piston driving mechanism, a detection closed box, a gauze belt and a gauze belt driving mechanism, a one-way valve I is arranged in the empty needle nipple, the piston driving mechanism is arranged outside the right side of the injection needle cylinder, and a liquid outlet is formed in the end, close to the empty needle nipple, of the left side of the injection needle cylinder. The detection closed box comprises a sterile sealed box body, a flow guide hopper and a collection box; the sterile sealing box body is arranged outside the left side of the injection needle cylinder, the flow guide hopper and the collection box are arranged in the sterile sealing box body, and an outlet of the one-way valve II is communicated with the interior of the flow guide hopper; the gauze belt is positioned between the flow guide hopper and the collection box; the gauze belt driving mechanism is arranged outside the left side of the injection needle cylinder; and a display capable of observing and / or displaying whether the gauze tape has blood clots is arranged on the sterile sealed box body. The whole pumpback and injection are automatically completed under the sterile condition, manual operation is not needed, and the probability that the catheter connector is polluted is greatly reduced.

Description

Technical Field

[0001] The invention relates to the technical field of hemodialysis, and in particular to a hemodialysis vascular access patency detector. Background Art

[0002] Anticoagulant therapy for blood purification refers to the individual selection of appropriate anticoagulants and dosages based on the assessment of the patient's coagulation status, regular monitoring, evaluation and adjustment to maintain the flow of blood in the dialysis circuit and dialyzer to ensure the smooth implementation of blood purification; avoid blood loss caused by extracorporeal circulation coagulation; prevent thromboembolic diseases induced by blood coagulation activation caused by extracorporeal circulation; prevent inflammatory reactions induced by blood activation during extracorporeal circulation, improve the biocompatibility of blood purification, and ensure the effectiveness and safety of blood purification.

[0003] When connecting the central venous indwelling catheter to the pipeline on the hemodialysis machine, first check that the catheter clamp is in the clamped state, then remove the catheter heparin cap, disinfect the catheter joints separately, and then use a syringe to withdraw the heparin sealed in the catheter, and inject it on the gauze to check whether there is a blood clot. The amount of withdrawal is about 2 ml for each arterial and venous tube. If the return blood flow of the catheter is not smooth, carefully find the cause, and it is strictly forbidden to use a syringe to forcefully inject the catheter cavity. According to the doctor's instructions, the first dose of heparin is injected from the venous end of the catheter (if low molecular weight heparin is used as an anticoagulant, it should be injected intravenously once before the machine according to the doctor's instructions), and the extracorporeal circulation is connected.

[0004] When testing the patency of hemodialysis vascular access, the most important step is to use a syringe to withdraw the heparin from the needle in the catheter and inject it onto the gauze to check for blood clots. If there are blood clots, continue to withdraw until there are no blood clots. When more than 10 ml is withdrawn, stop withdrawing and be sure to report to the doctor to take treatment measures such as removing the tube and replacing the pipeline. During withdrawal, after removing the catheter heparin cap, the catheter connector, empty needle nipple and gauze are all exposed. If there are blood clots, it is necessary to continue withdrawing, which makes the catheter connector, empty needle nipple and gauze exposed for a longer time, increasing the chance of contamination of the catheter connector. During the entire withdrawal process, manual connection withdrawal is used, with one hand holding the catheter connector and the other hand holding the syringe, so it is difficult to avoid touching the catheter connector with the hand and contaminating it. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, the present invention provides a hemodialysis vascular access patency detector.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A hemodialysis vascular access patency detector comprises a syringe, a piston drive mechanism, a detection closed box, a gauze belt and a gauze belt drive mechanism; the syringe comprises a syringe barrel, a piston and an empty needle nipple arranged on the front end of the syringe barrel;

[0008] A one-way valve I is arranged in the empty needle nipple, and the piston driving mechanism is arranged outside the right side of the injection syringe, and is used to drive the piston to move back and forth in the injection syringe; a liquid outlet is arranged at one end of the left side of the injection syringe close to the empty needle nipple, and a one-way valve II is arranged in the liquid outlet;

[0009] The detection closed box includes a sterile sealed box body, a diversion hopper and a collection box; the sterile sealed box body is arranged outside the left side of the injection syringe, the diversion hopper and the collection box are arranged in the sterile sealed box body, and the bottom outlet of the diversion hopper is located above the collection box, and the outlet of the one-way valve II is connected to the diversion hopper; the gauze belt is located between the diversion hopper and the collection box;

[0010] The gauze belt driving mechanism is arranged outside the left side of the injection syringe, and is used to drive the gauze belt to move between the guide bucket and the collection box;

[0011] The sterile sealed box is provided with a display for observing and / or displaying whether the gauze belt has a blood clot.

[0012] As a preferred solution of the present invention, the gauze belt driving mechanism includes a guide cylinder and a driving rod; the guide cylinder is arranged outside the left side of the injection syringe, the axis of the guide cylinder is parallel to the axis of the injection syringe, the driving rod is arranged along the axis of the guide cylinder and slides with the guide cylinder in the axial direction, both ends of the driving rod extend out of the two ends of the guide cylinder, the front end of the driving rod extends into the sterile sealed box body and slides and seals with the sterile sealed box body, the rear end of the driving rod extends to the rear end of the piston, a sliding sleeve is fixedly provided on the driving rod, the sliding sleeve is located in the guide cylinder and slides with the inner wall of the guide cylinder in the axial direction, a pre-tensioning spring is provided on the driving rod in the guide cylinder, one end of the pre-tensioning spring is fixedly connected to one end of the guide cylinder close to the sterile sealed box body, and the other end of the pre-tensioning spring is fixedly connected to the sliding sleeve; a pressure plate which can be pressed on the side of the gauze belt and can drive the gauze belt to move toward the rear end of the guide cylinder on the collecting box is provided on the end of the driving rod extending into the sterile sealed box body.

[0013] As a preferred solution of the present invention, the gauze band driving mechanism also includes a pull rope; one end of the pressure plate is rotatably set on the driving rod through a rotating shaft, and a torsion spring is arranged on the rotating shaft near the end, one end of the torsion spring is fixedly arranged on the side wall of one end of the pressure plate, and the other end of the torsion spring is fixedly arranged on the driving rod; a pull rope through hole is axially arranged in the driving rod, and the pull rope passes through the pull rope through hole, one end of the pull rope is connected to the pressure plate and close to the other end of the pressure plate, and the other end of the pull rope is connected to the rear end of the piston; when the torsion spring is in a free state, the other end of the pressure plate is away from the gauze band; when the pull rope moves backward with the piston, the pull rope pulls the pressure plate so that the other end of the pressure plate is pressed on the side of the gauze band and drives the gauze band to move toward the rear end of the guide cylinder on the collecting box.

[0014] As a preferred embodiment of the present invention, the gauze belt driving mechanism also includes a guide strip plate, a positioning guide plate and a separation plate; the guide strip plate is arranged above the collection box and close to the injection syringe, and the guide strip plate is parallel to the driving rod; one end of the positioning guide plate is fixed to the front side of the sterile sealed box body, and the other end of the positioning guide plate extends to the front end of the guide strip plate and forms a gap I with the front end of the guide strip plate for the pressure plate to pass through; one end of the separation plate is fixed to the rear side of the sterile sealed box body, and the other end of the separation plate extends to the The rear end of the positioning guide plate forms a gap II with the rear end of the guide strip plate for the pressure plate to pass through; the rear end of the positioning guide plate is an inclined surface I with the top facing forward and the bottom facing backward, and the front end of the guide strip plate is an inclined surface II with the top facing backward and the bottom facing forward; the rear end of the guide strip plate is an inclined surface III with the top facing backward and the bottom facing forward, the front end of the separation plate is an upper inclined surface IV with the middle part facing forward and the top facing backward, and the front end of the separation plate is a lower inclined surface V with the middle part facing forward and the bottom facing backward, the top of the guide strip plate is lower than the top of the separation plate, and the bottom of the guide strip plate is higher than the middle of the separation plate;

[0015] An inwardly concave slide groove is arranged near the inclined surface III at the top of the guide strip plate, a slider is arranged in the slide groove, an arc-shaped inclined surface with the top facing backward and the bottom facing forward is arranged on the side of the slide groove near the inclined surface III, a preload spring which can push the slider to extend out of the inclined surface III is arranged between the inner side of the slide groove and the slider, and the top surface of the slider is flush with the top surface of the guide strip plate.

[0016] As a preferred solution of the present invention, the two sides of the gauze belt are respectively clamped in the upper and lower clamping plates, and a plurality of connecting plates are evenly spaced between the clamping plates at the lower parts of the two sides of the gauze belt; when the pull rope moves backward with the piston, the pull rope pulls the pressure plate so that the other end of the pressure plate is pressed on the clamping plate at the upper part of the gauze belt close to the guide cylinder side and drives the gauze belt to move toward the rear end of the guide cylinder on the collecting box.

[0017] As a preferred solution of the present invention, concave guide rails are respectively provided near the inner side of the right side plate and the inner side of the left side plate of the collecting box and cooperate with the clamping plates at the lower part of the corresponding sides, and the surfaces of the guide rails are parallel to the top surfaces of the front side plate and the top surfaces of the rear side plate of the collecting box.

[0018] As a preferred solution of the present invention, an arc-shaped groove is arranged on the left side of the driving rod near the front end, the rotating shaft is arranged in the arc-shaped groove and close to the top end, the axis of the rotating shaft is parallel to the axis of the driving rod, and the front end of the pull rope through hole is located in the arc-shaped groove and close to the bottom end.

[0019] As a preferred embodiment of the present invention, the sterile sealed box is a transparent sterile sealed box, the display is a magnifying glass observation window and / or a camera, the magnifying glass observation window is arranged on the top cover of the sterile sealed box and faces the gauze belt under the guide bucket, and the camera is arranged under the top cover of the sterile sealed box and faces the gauze belt under the guide bucket.

[0020] As a preferred solution of the present invention, a sealing connection sleeve is provided on the outside of the empty needle nipple, and an internal thread matching the external thread on the catheter connector is provided on the inner wall of the sealing connection sleeve near the rear side, the rear end of the sealing connection sleeve is rotatably and sealingly connected to the rear end of the empty needle nipple, and a sealing film is provided at the front end of the sealing connection sleeve.

[0021] As a preferred solution of the present invention, a sterilizing cotton sleeve is provided on the inner wall of the sealing connection sleeve near the front side.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. When using the hemodialysis vascular access patency detector, the empty needle nipple only needs to be inserted into the catheter connector once, and automatic withdrawal and injection are achieved through the piston drive mechanism. The gauze is located in a sterile sealed box. It is only necessary to check whether there is a blood clot on the gauze through a display that can observe and / or display whether there is a blood clot on the gauze. If there is a blood clot, the piston drive mechanism can be used to withdraw and inject again. The entire withdrawal and injection, as well as the inspection of the blood clot on the gauze are completed in a sealed and sterile state, effectively reducing or avoiding contamination of the catheter connector.

[0024] 2. The entire withdrawal and injection process is completed automatically under sterile conditions without manual operation, which greatly reduces the chance of contamination of the catheter connector.

[0025] 3. The present invention provides a sealing connection sleeve outside the empty needle nipple. When the empty needle nipple is inserted into the catheter connector, the catheter connector is pushed and disinfected using the sterile cotton sleeve in the sealing connection sleeve. Manual disinfection of the catheter connector is not required, which further ensures that the catheter connector is not contaminated or reduces the chance of contamination of the catheter connector. At the same time, the empty needle nipple is also placed in a sealed and sterile sealing connection sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of a hemodialysis vascular access patency detector;

[0027] Figure 2 This is a schematic diagram of the structure of the connection between the hemodialysis vascular access patency detector and the catheter connector Figure 1 ;

[0028] Figure 3 This is a schematic diagram of the structure of the connection between the hemodialysis vascular access patency detector and the catheter connector Figure 2 ;

[0029] Figure 4 yes Figure 3 The enlarged structural diagram at A in the middle;

[0030] Figure 5 It is a structural schematic diagram of the guide bucket;

[0031] Figure 6 It is a schematic diagram of the structure of the cooperation between the guide cylinder and the driving rod;

[0032] Figure 7 is a schematic diagram of the cross-sectional structure of the driving rod;

[0033] Figure 8 It is a schematic diagram of the structure in which an arc-shaped groove is arranged on the driving rod;

[0034] Fig. 9 It is a structural schematic diagram of the pressure plate;

[0035] Fig.10 This is a schematic diagram of the structure where the pressure plate is installed in the arc groove Figure 1 ;

[0036] Fig.11 This is a schematic diagram of the structure where the pressure plate is installed in the arc groove Figure 2 ;

[0037] Fig.12 It is a schematic diagram of the structure in which the guide strip plate, the positioning guide plate and the separation plate are arranged in a sterile sealed box;

[0038] Fig.13 It is a structural schematic diagram in which the guide strip plate is installed below the top plate in the sterile sealed box;

[0039] Fig.14It is a structural schematic diagram of a guide strip plate provided with a slide block close to the inclined surface III;

[0040] Fig.15 It is a structural schematic diagram of the pressing part of the pressing plate entering the notch I and continuing to rotate downward;

[0041] Fig.16 It is a structural schematic diagram in which the pressing part of the pressing plate presses the side of the gauze belt and drives the gauze belt to move toward the rear end of the guide cylinder on the collecting box;

[0042] Fig.17 It is a structural schematic diagram of the pressing plate rotating upward through the gap II;

[0043] Fig.18 It is a schematic diagram of the structure in which the pressing plate is wound around the guide strip plate and slides forward on the guide strip plate;

[0044] Fig.19 It is a schematic diagram of the structure in which both sides of the gauze belt are clamped in the upper and lower clamping plates respectively;

[0045] Fig. 20 It is a transverse cross-sectional schematic diagram of the two sides of the gauze belt being clamped in the upper and lower clamping plates respectively;

[0046] Fig.21 It is a schematic diagram of the structure of the collection box;

[0047] Fig. 22 It is a structural schematic diagram of a sealing connection sleeve.

[0048] In the figure: 1-syringe; 11-injection syringe; 12-piston; 13-empty needle nipple; 14-check valve I; 15-check valve II; 2-test sealing box; 21-sterile sealing box; 22-flow guide bucket; 23-collection box; 231-guide rail; 3-gauze belt; 31-clamp plate; 32-connecting plate; 4-guide cylinder; 41-pre-tension spring; 5-driving rod; 51-sliding sleeve; 52-pressing plate; 521-pressure part; 522-through hole I; 523-through hole II; 53-pull rope; 54-rotating shaft; 55-torsion spring; 56-pull rope perforation ; 57—arc-shaped groove; 6—guide strip plate; 61—inclined surface II; 62—inclined surface III; 63—connecting rod; 64—slide groove; 65—slider; 66—arc-shaped inclined surface; 67—preload spring; 7—positioning guide plate; 71—inclined surface I; 8—separation plate; 81—upper inclined surface IV; 82—lower inclined surface V; 9—magnifying glass observation window; 10—camera; 16—sealing connection sleeve; 161—internal thread; 162—sealing film; 163—disinfectant cotton sleeve; 17—catheter joint; 18—front base; 19—rear base; 20—cylinder; 24—limit block. DETAILED DESCRIPTION

[0049] The present invention is described in detail below in conjunction with embodiments and drawings.

[0050] like Figure 1-Figure 3 As shown, the hemodialysis vascular access patency detector includes a syringe 1, a piston drive mechanism, a detection closed box 2, a gauze belt 3, a gauze belt drive mechanism, a front base 18 and a rear base 19. The syringe 1 is mounted on the front base 18 and the rear base 19. In this embodiment, the front side refers to the side facing the empty needle nipple 13 of the syringe 1, and the rear side refers to the side facing the tail of the piston 12.

[0051] The syringe 1 comprises an injection syringe 11, a piston 12 and an empty needle nipple 13 arranged at the front end of the injection syringe 11. A one-way valve I14 is arranged in the empty needle nipple 13, which can only enter but not exit. Figure 4 As shown, only the blood in the catheter connector 17 is allowed to enter the injection syringe 11. The piston drive mechanism is arranged outside the right side of the injection syringe 11. In this embodiment, the piston drive mechanism adopts a cylinder 20, the piston rod of the cylinder 20 is parallel to the axis of the injection syringe 11, and the piston rod of the cylinder 20 is connected to the rear end of the piston 12, which is used to drive the piston 12 to move back and forth in the injection syringe 11. A liquid outlet is arranged at one end of the left side of the injection syringe 11 near the empty needle nipple 13, and a one-way valve II15 that can only flow out but not in is arranged in the liquid outlet, which only allows the blood in the injection syringe 11 to flow out and enter the guide bucket 22. The detection closed box 2 includes a sterile sealed box body 21, a guide bucket 22 and a collection box 23. The sterile sealed box 21 is arranged outside the left side of the injection syringe 11, the guide bucket 22 and the collection box 23 are arranged inside the sterile sealed box 21, and the bottom outlet of the guide bucket 22 is located above the collection box 23, and the outlet of the one-way valve II 15 is connected to the inside of the guide bucket 22. The gauze belt 3 is located between the guide bucket 22 and the collection box 23; the gauze belt driving mechanism is arranged outside the left side of the injection syringe 11, and is used to drive the gauze belt 3 to move between the guide bucket 22 and the collection box 23; the sterile sealed box 21 is provided with a display that can observe and / or display whether the gauze belt 3 has a blood clot. In this embodiment, a sealing cover is provided on the top of the guide bucket 22, and the guide bucket 22 is equivalent to a guide tube, which is convenient for draining the blood ejected from the one-way valve II 15 to the gauze belt 3. The internal structure of the guide bucket 22 is as shown in FIG. Figure 5 As shown, Figure 5 As a schematic diagram for disassembling the sealing cover, a conduit may be used instead of the guide hopper 22 .

[0052] When the piston rod of the cylinder 20 moves backward, the piston 12 of the syringe 1 is driven to move backward, the one-way valve I14 opens, and the blood in the vein or arterial catheter is drawn through the empty needle nipple 13, and the blood enters the injection syringe 11; when the piston rod of the cylinder 20 moves forward, the one-way valve I14 is closed, the one-way valve II15 is opened, and the piston 12 pushes the blood in the injection syringe 11 through the one-way valve II15 into the guide bucket 22, and the blood is then injected onto the gauze belt 3, and then the display is used to confirm whether there is a blood clot. If there is a blood clot, it is necessary to start the cylinder 20 again, draw blood from the vein or arterial catheter again, and check again whether there is a blood clot, until there is no blood clot, and the amount of each withdrawal is 2ml. When it is drawn for the fifth time, that is, it starts to exceed 10ml, it is necessary to stop the withdrawal.

[0053] Wherein, the gauze belt driving mechanism comprises a guide cylinder 4 and a driving rod 5, as shown in FIG. Figure 6 As shown. The guide cylinder 4 is arranged outside the left side of the injection syringe 11 and is located at the rear side of the detection closed box 2. The axis of the guide cylinder 4 is parallel to the axis of the injection syringe 11. The drive rod 5 is arranged along the axis of the guide cylinder 4 and slides with the guide cylinder 4 in the axial direction. Both ends of the drive rod 5 extend out of the two ends of the guide cylinder 4. The front end of the drive rod 5 extends into the sterile sealed box body 21 and slides and seals with the sterile sealed box body 21. The rear end of the drive rod 5 extends to the rear end of the piston 12. A guide block is arranged in the rear end hole of the guide cylinder 4. A guide groove is arranged axially on the rear half of the drive rod 5. The guide block in the rear end hole of the guide cylinder 4 is located in the guide groove on the drive rod 5 and slides with the guide groove, thereby realizing that the drive rod 5 can only slide axially along the guide cylinder 4 and cannot rotate around the circumferential direction. A sliding sleeve 51 is fixedly sleeved on the drive rod 5. The sliding sleeve 51 is located in the guide cylinder 4 and slides with the inner wall of the guide cylinder 4 in the axial direction. A pre-tension spring 41 is sleeved on the drive rod 5 in the guide cylinder 4, as shown in FIG. Figure 6 As shown, the front end of the pre-tension spring 41 is fixedly connected to one end of the guide cylinder 4 near the aseptic sealed box 21, that is, the front end of the pre-tension spring 41 is fixedly connected to the front end in the guide cylinder 4, and the rear end of the pre-tension spring 41 is fixedly connected to the sliding sleeve 51. When the drive rod 5 moves backward, the pre-tension spring 41 applies a forward pulling force to the drive rod 5. A pressing plate 52 is provided on the end of the drive rod 5 extending into the aseptic sealed box 21, which can press on the side of the gauze belt 3 and drive the gauze belt 3 to move toward the rear end of the guide cylinder 4 on the collection box 23. Each time the drive rod 5 moves backward, the gauze belt 3 can be driven to move backward once.

[0054] The gauze belt driving mechanism also includes a pull rope 53. One end of the pressing plate 52 is rotatably arranged on the driving rod 5 through a rotating shaft 54, and a torsion spring 55 is arranged near the end of the rotating shaft 54. One end of the torsion spring 55 is fixedly arranged on a side wall of one end of the pressing plate 52, and the other end of the torsion spring 55 is fixedly arranged on the driving rod 5. A pull rope through hole 56 is arranged in the driving rod 5 along the axial direction, such as Figure 7 As shown, the pull rope 53 passes through the pull rope through hole 56, one end of the pull rope 53 is connected to the other end of the pressing plate 52 close to the pressing plate 52, and the other end of the pull rope 53 is connected to the rear end of the piston 12. When the torsion spring 55 is in a free state, the other end of the pressing plate 52 is away from the gauze belt 3; when the pull rope 53 moves backward with the piston 12, the pull rope 53 pulls the pressing plate 52 so that the other end of the pressing plate 52 is pressed on the side of the gauze belt 3 and drives the gauze belt 3 to move toward the rear end of the guide cylinder 4 on the collecting box 23.

[0055] In this embodiment, an arc-shaped groove 57 is provided on the left side of the driving rod 5 near the front end, the rotating shaft 54 ​​is arranged in the arc-shaped groove 57 and near the top end, the axis of the rotating shaft 54 ​​is parallel to the axis of the driving rod 5, and the front end of the pull rope through hole 56 is located in the arc-shaped groove 57 and near the bottom end. Figure 8 As shown. The structure of the pressing plate 52 is as shown Fig. 9 As shown, the side of the pressing plate 52 close to the driving rod 5 forms an arc shape adapted to the arc groove 57. A through hole Ⅰ522 is provided at the top of the pressing plate 52. The rotating shaft 54 ​​passes through the through hole Ⅰ522. The pressing plate 52 can rotate around the rotating shaft 54. Torsion springs 55 are respectively sleeved on the rotating shaft 54 ​​and located on both sides of the pressing plate 52. The bottom of the pressing plate 52 is tilted outward to form a pressure-applying portion 521. A through hole Ⅱ523 is provided on the pressing plate 52 near the pressure-applying portion 521, so that the front end of the pull rope 53 can pass through the through hole Ⅱ523 and be connected to the pressing plate 52. When the piston 12 is located at the front end in the injection syringe 11, the pull rope 53 does not pull the pressing plate 52. The pressing plate 52 rotates upward under the action of the two torsion springs 55, that is, when the torsion springs 55 are in a free state, the pressure-applying portion 521 of the pressing plate 52 is upward and away from the gauze belt 3, as shown in FIG. Fig.10 When the piston 12 moves backward in the syringe 11, the pull rope 53 pulls the pressure plate 52, and the pressure plate 52 rotates downward under the action of the pull rope 53, as shown in FIG. Fig.11 As shown, the two torsion springs 55 generate torque deformation, the pressure portion 521 of the pressure plate 52 is downward and pressed on the side of the gauze belt 3 and drives the gauze belt 3 to move on the collecting box 23 toward the rear end of the guide cylinder 4.

[0056] The gauze belt driving mechanism also includes a guide strip plate 6, a positioning guide plate 7 and a separation plate 8. Fig.12 As shown, the guide strip plate 6, the positioning guide plate 7 and the separation plate 8 are sequentially arranged in the sterile sealed box 21 from front to back. The guide strip plate 6 is arranged below the top plate in the sterile sealed box 21 through a connecting rod 63, one end of the connecting rod 63 is connected to the top plate in the sterile sealed box 21, and the other end of the connecting rod 63 is vertically downward and connected to the side of the guide strip plate 6 away from the injection syringe 11, as shown in FIG. Fig.13As shown, the guide strip plate 6 is located above the collection box 23 and close to the injection syringe 11, the guide strip plate 6 is parallel to the driving rod 5, and the bottom of the guide strip plate 6 is lower in height than the bottom of the guide bucket 22. The front end of the positioning guide plate 7 is fixed to the front side of the sterile sealed box 21, and the rear end of the positioning guide plate 7 extends to the front end of the guide strip plate 6 and forms a gap I with the front end of the guide strip plate 6 for the pressure plate 52 to pass through. The rear end of the separation plate 8 is fixed to the rear side of the sterile sealed box 21, and the front end of the separation plate 8 extends to the rear end of the guide strip plate 6 and forms a gap II with the rear end of the guide strip plate 6 for the pressure plate 52 to pass through. The rear end of the positioning guide plate 7 is an inclined surface Ⅰ71 with the top facing forward and the bottom facing backward, and the front end of the guiding strip plate 6 is an inclined surface Ⅱ61 with the top facing backward and the bottom facing forward. After this arrangement, the upper opening of the gap Ⅰ is larger, which is conducive to the downward rotation of the pressure plate to bypass the gap Ⅰ; the rear end of the guiding strip plate 6 is an inclined surface Ⅲ62 with the top facing backward and the bottom facing forward, the front end of the separation plate 8 is an upper inclined surface Ⅳ81 with the middle part facing forward and the top facing backward, and the front end of the separation plate 8 is a lower inclined surface Ⅴ82 with the middle part facing forward and the bottom facing backward. The top of the guiding strip plate 6 is lower than the top of the separation plate 8, and the bottom of the guiding strip plate 6 is higher than the middle of the separation plate 8. A concave slide groove 64 is provided at the top of the guide strip plate 6 near the inclined surface III 62, and a slider 65 is provided in the slide groove 64. The slider 65 slides with the slide groove 64 in the front-to-back direction. A curved inclined surface 66 with the top facing backward and the bottom facing forward is provided on the side of the slide groove 64 near the inclined surface III 62. A preload spring 67 that can push the slider 65 out of the inclined surface III 62 is provided between the inner side of the slide groove 64 and the slider 65, that is, one end of the preload spring 67 is connected to the front side of the slide groove 64, and the other end of the preload spring 67 is connected to the front side of the slider 65. The top surface of the slider 65 is flush with the top surface of the guide strip plate 6. Fig.14 Under the action of the preload spring 67 , one end of the slider 65 close to the arcuate slope 66 extends out of the slope III 62 , and when the arcuate slope 66 is compressed, the slider 65 slides inwardly into the slide groove 64 .

[0057] When the piston 12 moves backward in the injection syringe 11, under the pulling force of the pre-tension spring 41 on the driving rod 5, the pull rope 53 starts to pull the pressure plate 52, and the two torsion springs 55 produce torque deformation. The pressure plate 52 rotates downward under the action of the pull rope 53, and the pressure-applying portion 521 of the pressure plate 52 corresponds to the notch I and continues to rotate downward. Under the guidance of the notch I, the pressure-applying portion 521 of the pressure plate 52 continues to rotate downward along the notch I. Fig.15 As shown, the pressure portion 521 of the pressure plate 52 then rotates to the bottom of the notch Ⅰ and presses on the side of the gauze belt 3. When the piston 12 continues to move backward, the piston 12 drives the pull rope 53 to move backward, and the pull rope 53 also drags the drive rod 5 to move backward. The pre-tension spring 41 is stretched, and the pressure portion 521 of the pressure plate 52 presses the side of the gauze belt 3 and drives the gauze belt 3 to move toward the rear end of the guide cylinder 4 on the collection box 23, as shown in FIG. Fig.16 When the pressing plate 52 moves to the separation plate 8, the bottom surface of the pressing part 521 of the pressing plate 52 contacts the upper middle side of the separation plate 8, and then the pressing part 521 of the pressing plate 52 moves obliquely upward on the upper inclined surface IV81 of the separation plate 8, while the gauze tape 3 below the pressing part 521 of the pressing plate 52 contacts the upper middle side of the separation plate 8 and then moves obliquely downward along the lower inclined surface V82 of the separation plate 8. At this time, the pressing part 521 of the pressing plate 52 is separated from the gauze tape 3 below the pressing part 521. As the pressing part 521 of the pressing plate 52 moves obliquely upward along the upper inclined surface IV81 of the separation plate 8, Fig.17 As shown, the pressure-applying portion 521 of the pressure plate 52 presses the arc-shaped inclined surface 66 obliquely upward and pushes the slider 65 to move toward the middle of the guide strip plate 6. The preload spring 67 is compressed. When the pressure-applying portion 521 of the pressure plate 52 moves along the upper inclined surface IV81 and the arc-shaped inclined surface 66 to the top of the slider 65, the slider 65 does not move backward again under the action of the restoring force of the return spring 67 after being squeezed by the pressure-applying portion 521. The top of the slider 65 extends out of the inclined surface III62 and approaches the upper inclined surface IV81. At this time, the syringe 1 draws 2 ml of blood and the piston 12 stops moving in the injection syringe 11. Subsequently, the piston 12 moves forward in the injection syringe 11, and the pressure-applying portion 521 of the pressure plate 52 moves forward in the opposite direction, and then slides onto the slider 65, and slides down to the top of the guide strip plate 6 under the guidance of the slider 65. At this time, under the action of the pre-tension spring 41, the driving rod 5 is driven to move forward, and the driving rod 5 drives the pressure-applying portion 521 of the pressure plate 52 to move forward above the guide strip plate 6, as shown in FIG. Fig.18 shown.

[0058] The two sides of the gauze belt 3 are respectively clamped between the upper and lower clamping plates 31, as shown in FIG. Fig.19 As shown, a plurality of connecting plates 32 are evenly spaced between the clamping plates 31 at the lower parts of both sides of the gauze belt 3, as shown in FIG. Fig. 20 As shown. When the pull rope 53 moves backward with the piston 12, the pull rope 53 pulls the pressure plate 52 so that the other end of the pressure plate 52 is pressed on the clamping plate 31 at the upper part of the gauze belt 3 near the guide cylinder 4 and drives the gauze belt 3 to move toward the rear end of the guide cylinder 4 on the collection box 23. The right side plate and the left side plate of the collection box 23 are respectively provided with concave guide rails 231 that cooperate with the clamping plate 31 at the lower part of the corresponding side. The surface of the guide rail 231 is parallel to the top surface of the front side plate and the top surface of the rear side plate of the collection box 23, as shown. Fig.21 As shown. One end of the gauze belt 3 is placed on the collection box 23, and the clamps 31 on both sides of the gauze belt 3 are respectively placed on the guide rails 231 on the left and right sides of the collection box 23. By moving the clamps 31 of the guide rails 231 backward, the entire gauze belt 3 can be driven to move backward synchronously. The collection box 23 not only supports the gauze belt 3, but also facilitates the movement of the gauze belt 3 thereon, and can also collect blood leaked during the detection of the gauze belt 3.

[0059] The sterile sealed box 21 is a transparent sterile sealed box, and the display is a magnifying glass observation window 9 and / or a camera 10. The magnifying glass observation window 9 is arranged on the top cover of the sterile sealed box 21 and is directly opposite to the gauze belt 3 below the diversion bucket 22. The camera 10 is arranged under the top cover and is directly opposite to the gauze belt 3 below the diversion bucket 22. In this embodiment, both the magnifying glass observation window 9 and the camera 10 are arranged. Medical personnel can check whether there is a blood clot in the extracted blood through the magnifying glass observation window 9, and can connect the camera 10 with the display screen arranged on the sterile sealed box 21 or with the controller of the hemodialysis machine, and display it through the display screen on the sterile sealed box 21 or the display screen on the hemodialysis machine, and can also compare it through the controller. If there is a blood clot on the gauze belt 3, an alarm can be sounded through the alarm on the hemodialysis machine.

[0060] The empty needle nipple 13 is provided with a sealing connection sleeve 16. The inner wall of the sealing connection sleeve 16 is provided with an internal thread 161 that matches the external thread on the catheter connector 17 near the rear side. The rear end of the sealing connection sleeve 16 is rotatably and sealedly connected to the rear end of the empty needle nipple 13. The front end of the sealing connection sleeve 16 is provided with a sealing film 162. The inner wall of the sealing connection sleeve 16 is provided with a sterilizing cotton sleeve 163 near the front side. Fig. 22 As shown. The sealing film 162 makes the sealing connection sleeve 16 in a sealed and sterile state, which can ensure that the connection process and the use are in a sterile state. When in use, tear off the sealing film 162, unscrew the iodine cap on the catheter connector 17, and put the sealing connection sleeve 16 on the catheter connector 17. The sterile cotton sleeve 163 of the sealing connection sleeve 16 disinfects the catheter connector 17 during the sleeve process, and then rotate the sealing connection sleeve 16 to make the internal thread 161 in the sealing connection sleeve 16 be screwed on the external thread on the catheter connector 17, thereby achieving sterile docking of the syringe 1 and the catheter connector 17. A sealing connection sleeve 16 is provided outside the empty needle nipple 13. When the empty needle nipple 13 is inserted into the catheter connector 17, the sterilizing cotton sleeve 163 in the sealing connection sleeve 16 is used to push-type sterilize the catheter connector 17. The sealing connection sleeve 16 is further rotated to push-type rotate the sealing connection sleeve 16 onto the catheter connector 17, which not only sterilizes the front end of the catheter connector 17 but also allows the front end of the catheter connector 17 to be covered in the sealing connection sleeve 16. At the same time, the empty needle nipple 13 is handled in the sealed and sterile sealing connection sleeve 16 without being contaminated, thereby further reducing the probability of contamination of the catheter connector 17.

[0061] In this embodiment, the distance between notch I and notch II is exactly the distance that the piston rod of the cylinder 20 moves. In order to more accurately control the forward and backward movement distance of the pressure plate 52, two limit blocks 24 can be set in the guide cylinder 4. The distance between the two limit blocks 24 is exactly the axial movement distance of the pressure plate 52. The sliding sleeve 51 is located between the two limit blocks 24. When the sliding sleeve 51 moves to the limit block 24 on the front side, the pressure plate 52 corresponds to the notch I; when the sliding sleeve 51 moves to the limit block 24 on the rear side, the pressure plate 52 corresponds to the notch II.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A hemodialysis vascular access patency detector, comprising a syringe (1), wherein the syringe (1) comprises a syringe barrel (11), a piston (12) and an empty needle nipple (13) arranged on the front end of the syringe barrel (11), characterized in that: It also includes a piston drive mechanism, a detection closed box (2), a gauze belt (3) and a gauze belt drive mechanism; A one-way valve I (14) is arranged in the empty needle nipple (13); the piston driving mechanism is arranged outside the right side of the injection syringe (11) and is used to drive the piston (12) to reciprocate in the injection syringe (11); a liquid outlet is arranged at one end of the left side of the injection syringe (11) close to the empty needle nipple (13), and a one-way valve II (15) is arranged in the liquid outlet; The detection closed box (2) comprises a sterile sealed box body (21), a flow guide hopper (22) and a collection box (23); the sterile sealed box body (21) is arranged outside the left side of the injection syringe (11), the flow guide hopper (22) and the collection box (23) are arranged inside the sterile sealed box body (21), and the bottom outlet of the flow guide hopper (22) is located above the collection box (23), and the outlet of the one-way valve II (15) is connected to the inside of the flow guide hopper (22); the gauze belt (3) is located between the flow guide hopper (22) and the collection box (23); The gauze belt driving mechanism is arranged outside the left side of the injection syringe (11) and is used to drive the gauze belt (3) to move between the guide bucket (22) and the collection box (23); The sterile sealed box (21) is provided with a display capable of observing and / or displaying whether the gauze band (3) has a blood clot.

2. The hemodialysis vascular access patency detector according to claim 1, characterized in that: The gauze belt driving mechanism comprises a guide cylinder (4) and a driving rod (5); the guide cylinder (4) is arranged outside the left side of the injection syringe (11), the axis of the guide cylinder (4) is parallel to the axis of the injection syringe (11), the driving rod (5) is arranged along the axis of the guide cylinder (4) and slides with the guide cylinder (4) in the axial direction, both ends of the driving rod (5) extend out of the two ends of the guide cylinder (4), the front end of the driving rod (5) extends into the sterile sealed box (21) and slides and seals with the sterile sealed box (21), the rear end of the driving rod (5) extends to the rear end of the piston (12), and the fixed sleeve on the driving rod (5) is provided with A sliding sleeve (51), wherein the sliding sleeve (51) is located in the guide cylinder (4) and is slidably matched with the inner wall of the guide cylinder (4) in the axial direction; a pre-tension spring (41) is sleeved on the driving rod (5) in the guide cylinder (4); one end of the pre-tension spring (41) is fixedly connected to the end of the guide cylinder (4) close to the sterile sealing box (21), and the other end of the pre-tension spring (41) is fixedly connected to the sliding sleeve (51); a pressure plate (52) is provided on the end of the driving rod (5) extending into the sterile sealing box (21) and can press on the side of the gauze belt (3) and drive the gauze belt (3) to move on the collection box (23) toward the rear end of the guide cylinder (4).

3. The hemodialysis vascular access patency detector according to claim 2, characterized in that: The gauze belt driving mechanism also includes a pull rope (53); one end of the pressure plate (52) is rotatably arranged on the driving rod (5) through a rotating shaft (54); a torsion spring (55) is arranged on the rotating shaft (54) near the end; one end of the torsion spring (55) is fixedly arranged on a side wall of one end of the pressure plate (52); the other end of the torsion spring (55) is fixedly arranged on the driving rod (5); a pull rope through hole (56) is axially arranged in the driving rod (5); the pull rope (53) passes through the pull rope through hole (56); one end of the pull rope (53) is connected to the pressure plate (52) and is close to the other end of the pressure plate (52); the other end of the pull rope (53) is connected to the rear end of the piston (12); When the torsion spring (55) is in a free state, the other end of the pressure plate (52) is away from the gauze belt (3); when the pull rope (53) moves backward with the piston (12), the pull rope (53) pulls the pressure plate (52) so that the other end of the pressure plate (52) is pressed on the side of the gauze belt (3) and drives the gauze belt (3) to move on the collection box (23) toward the rear end of the guide cylinder (4).

4. The hemodialysis vascular access patency detector according to claim 3, characterized in that: The gauze belt driving mechanism also includes a guide strip plate (6), a positioning guide plate (7) and a separation plate (8); the guide strip plate (6) is arranged above the collection box (23) and close to the injection syringe (11), and the guide strip plate (6) is parallel to the driving rod (5); one end of the positioning guide plate (7) is fixed to the front side of the sterile sealed box (21), and the other end of the positioning guide plate (7) extends to the front end of the guide strip plate (6) and forms a gap I with the front end of the guide strip plate (6) for the pressure plate (52) to pass through; one end of the separation plate (8) is fixed to the rear side of the sterile sealed box (21), and the other end of the separation plate (8) extends to the rear end of the guide strip plate (6) and forms a gap I with the front end of the guide strip plate (6) for the pressure plate (52) to pass through. A notch II is formed with the rear end of the guide strip plate (6) through which the pressure plate (52) can pass; the rear end of the positioning guide plate (7) is an inclined surface I (71) with the top facing forward and the bottom facing backward, and the front end of the guide strip plate (6) is an inclined surface II (61) with the top facing backward and the bottom facing forward; the rear end of the guide strip plate (6) is an inclined surface III (62) with the top facing backward and the bottom facing forward, the front end of the separation plate (8) is an upper inclined surface IV (81) with the middle part facing forward and the top facing backward, and the front end of the separation plate (8) is a lower inclined surface V (82) with the middle part facing forward and the bottom facing backward, the top of the guide strip plate (6) is lower than the top of the separation plate (8), and the bottom of the guide strip plate (6) is higher than the middle of the separation plate (8); A concave slide groove (64) is provided at the top of the guide strip plate (6) near the inclined surface III (62), a slider (65) is provided in the slide groove (64), a curved inclined surface (66) with the top facing backward and the bottom facing forward is provided on the side of the slide groove (64) near the inclined surface III (62), a preload spring (67) is provided between the inner side of the slide groove (64) and the slider (65) for pushing the slider (65) to extend out of the inclined surface III (62), and the top surface of the slider (65) is flush with the top surface of the guide strip plate (6).

5. The hemodialysis vascular access patency detector according to claim 4, characterized in that: The two sides of the gauze belt (3) are respectively clamped in two upper and lower clamping plates (31), and a plurality of connecting plates (32) are evenly spaced between the clamping plates (31) at the lower parts of the two sides of the gauze belt (3); when the pull rope (53) moves backward with the piston (12), the pull rope (53) pulls the pressure plate (52) so that the other end of the pressure plate (52) is pressed on the clamping plate (31) at the upper part of one side of the gauze belt (3) close to the guide cylinder (4), and drives the gauze belt (3) to move on the collection box (23) toward the rear end of the guide cylinder (4).

6. The hemodialysis vascular access patency detector according to claim 5, characterized in that: A right side plate and a left side plate of the collection box (23) are respectively provided with concave guide rails (231) that cooperate with the clamping plates (31) at the lower parts of the corresponding sides, and the surfaces of the guide rails (231) are parallel to the top surfaces of the front side plate and the top surfaces of the rear side plate of the collection box (23).

7. The hemodialysis vascular access patency detector according to claim 6, characterized in that: An arc-shaped groove (57) is arranged on the left side of the driving rod (5) near the front end, the rotating shaft (54) is arranged in the arc-shaped groove (57) and near the top end, the axis of the rotating shaft (54) is parallel to the axis of the driving rod (5), and the front end of the pull rope through hole (56) is located in the arc-shaped groove (57) and near the bottom end.

8. The hemodialysis vascular access patency detector according to any one of claims 1 to 7, characterized in that: The sterile sealed box (21) is a transparent sterile sealed box, the display is a magnifying glass observation window (9) and / or a camera (10), the magnifying glass observation window (9) is arranged on the top cover of the sterile sealed box (21) and is directly opposite to the gauze belt (3) below the guide bucket (22), and the camera (10) is arranged under the top cover of the sterile sealed box (21) and is directly opposite to the gauze belt (3) below the guide bucket (22).

9. The hemodialysis vascular access patency detector according to claim 8, characterized in that: The empty needle nipple (13) is provided with a sealing connection sleeve (16) on the outside, and an internal thread (161) that cooperates with the external thread on the catheter connector (17) is provided on the inner wall of the sealing connection sleeve (16) near the rear side. The rear end of the sealing connection sleeve (16) is rotatably and sealingly connected to the rear end of the empty needle nipple (13), and a sealing film (162) is provided at the front end of the sealing connection sleeve (16).

10. The hemodialysis vascular access patency detector according to claim 9, characterized in that: A sterile cotton sleeve (163) is provided on the inner wall of the sealing connection sleeve (16) near the front side.

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