Hemodialysis vascular access patency tester

Abstract

The present invention provides a hemodialysis vascular access patency tester, comprising a syringe, a piston drive mechanism, a sealed detection box, a gauze band, and a gauze band drive mechanism. A one-way valve I is disposed within the empty needle nipple, the piston drive mechanism is disposed outside the right side of the syringe, and a liquid outlet is disposed on the left side of the syringe, near the end of the empty needle nipple. The sealed detection box comprises a sterile sealed box body, a diversion hopper, and a collection box. The sterile sealed box body is disposed outside the left side of the syringe, the diversion hopper and the collection box are disposed within the sterile sealed box body, and the outlet of the one-way valve II communicates with the diversion hopper. The gauze band is disposed between the diversion hopper and the collection box, and the gauze band drive mechanism is disposed outside the left side of the syringe. The sterile sealed box body is provided with a display for observing and / or displaying whether the gauze band contains blood clots. The entire withdrawal and injection process is performed automatically under sterile conditions, without the need for manual operation, significantly reducing the chance of contamination of the catheter connector.

Description

Technical Field

[0001] The present 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 coagulation during extracorporeal circulation; prevent thromboembolic diseases induced by blood coagulation activation due to 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 a central venous catheter to the hemodialysis machine, first check that the catheter clamp is closed, remove the heparin cap, and disinfect the catheter connectors. Use a syringe to withdraw the heparin from the catheter and inject it onto gauze to check for clots. Aspirate approximately 2 ml for each arterial and venous line. If blood return from the catheter is poor, carefully investigate the cause and avoid forcefully injecting the catheter lumen with a syringe. As directed by the physician, inject the first dose of heparin into the venous end of the catheter (if low molecular weight heparin is used as an anticoagulant, it should be injected intravenously once before use). Connect to the extracorporeal circulation system.

[0004] When testing the patency of hemodialysis vascular access, the most important step is to use a syringe to withdraw the heparin from the catheter needle and inject it onto the gauze to check for clots. If a clot is present, continue withdrawing until there is no clot. When more than 10ml is withdrawn, stop withdrawing and notify the doctor immediately. Treatment measures such as extubation and tubing replacement should be initiated. During withdrawal, after removing the heparin cap from the catheter, the catheter connector, empty needle nipple, and gauze are exposed. If a clot is present, continued withdrawal is necessary, which prolongs the exposure of the catheter connector, empty needle nipple, and gauze, increasing the risk of contamination. During the entire withdrawal process, manual connection and withdrawal are performed, with one hand holding the catheter connector and the other holding the syringe. This makes it difficult to avoid contact and contamination of the catheter connector. 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 tester comprises a syringe, a piston drive mechanism, a test sealing box, a gauze belt, and a gauze belt drive mechanism; the syringe comprises a syringe barrel, a piston, and a hollow needle nipple provided on the front end of the syringe barrel;

[0008] A one-way valve I is provided in the empty needle nipple, and the piston drive mechanism is provided outside the right side of the injection syringe, for driving the piston to move back and forth in the injection syringe; a liquid outlet is provided on the left side of the injection syringe near one end of the empty needle nipple, and a one-way valve II is provided 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 band 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, and 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 sealing box body and slides and seals with the sterile sealing box body, the rear end of the driving rod extends to the rear end of the piston, a sliding sleeve is fixed 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-tensioned spring is sleeved on the driving rod in the guide cylinder, one end of the pre-tensioned spring is fixedly connected to one end of the guide cylinder close to the sterile sealing box body, and the other end of the pre-tensioned 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 sealing box body.

[0013] As a preferred solution of the present invention, the gauze belt driving mechanism also includes a pull rope; one end of the pressure plate is rotatably arranged 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 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 side of the gauze belt and drives the gauze belt 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 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 part of the separation plate;

[0015] An inwardly concave sliding groove is provided at the top of the guide strip plate near the inclined surface III, and a slider is provided in the sliding groove. An arc-shaped inclined surface with the top facing backward and the bottom facing forward is provided on the side of the sliding groove near the inclined surface III. A pre-compression spring is provided between the inner side of the sliding groove and the slider to push the slider to extend out of the inclined surface III. 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 both 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 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, the right side plate and the left side plate of the collection box are respectively provided with concave guide rails near the inner side 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 collection box.

[0018] As a preferred solution of the present invention, an arc-shaped groove is provided on the left side of the driving rod near the front end, the rotating shaft is provided 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 solution 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 facing the gauze belt below the guide bucket, and the camera is arranged under the top cover of the sterile sealed box and facing the gauze belt below 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 that cooperates with 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 rotated and sealed with 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 sterile 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 tester, 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 use a display that can observe and / or display whether there is a blood clot on the gauze to check whether there is a blood clot. If there is a blood clot, the piston drive mechanism can be used again 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 on the outside of 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 inside the sealing connection sleeve. This eliminates the need for manual disinfection of the catheter connector, further ensuring that the catheter connector is not contaminated or reducing the chance of contamination. Furthermore, the empty needle nipple is kept 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 tester;

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

[0029] Figure 4 yes Figure 3 A schematic diagram of the structure enlarged in the middle;

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

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

[0032] Figure 7 Schematic diagram of the cross-sectional structure of the driving rod;

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

[0034] Figure 9 It is a structural diagram of the pressure plate;

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

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

[0037] Figure 12 This is a structural diagram of the guide strip plate, positioning guide plate and separation plate arranged in a sterile sealed box;

[0038] Figure 13 This is a structural diagram of the guide strip plate installed below the top plate in the sterile sealed box;

[0039] Figure 14This is a schematic diagram of the structure in which a slider is provided near the inclined surface III on the guide strip plate;

[0040] Figure 15 This is a structural diagram of the pressing portion of the pressing plate entering the notch I and continuing to rotate downward;

[0041] Figure 16 This is a structural diagram of the pressure portion of the pressing plate pressing the side of the gauze belt and driving the gauze belt to move toward the rear end of the guide cylinder on the collecting box;

[0042] Figure 17 This is a structural diagram of the pressing plate rotating upward through the gap II;

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

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

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

[0046] Figure 21 It is a structural diagram of the collection box;

[0047] Figure 22 It is a structural diagram of the sealing connection sleeve.

[0048] In the figure: 1—syringe; 11—syringe barrel; 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 hopper; 23—collection box; 231—guide rail; 3—gauze belt; 31—clamping plate; 32—connecting plate; 4—guide cylinder; 41—pre-tension spring; 5—driving rod; 51—sliding sleeve; 52—pressing plate; 521—pressure applying portion; 522—through hole I; 523—through hole II; 53—pull rope; 54—rotating shaft; 55—torsion spring; 56—pull rope through hole ; 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—sterilized cotton sleeve; 17—catheter connector; 18—front base; 19—rear base; 20—cylinder; 24—limit block. DETAILED DESCRIPTION

[0049] The present invention is described in detail below with reference to the embodiments and accompanying drawings.

[0050] like Figure 1-Figure 3 As shown, the hemodialysis vascular access patency tester includes a syringe 1, a piston drive mechanism, a test enclosure 2, a gauze band 3, a gauze band 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 rear end of the piston 12.

[0051] The syringe 1 comprises an injection syringe 11, a piston 12 and an empty needle nipple 13 provided on the front end of the injection syringe 11. A one-way valve I 14 is provided 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 syringe 11. The piston drive mechanism is arranged outside the right side of the 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 syringe 11. 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 syringe 11. A liquid outlet is provided on the left side of the syringe 11 near the empty needle nipple 13. A one-way valve II 15 that only allows outflow but not inflow is provided in the liquid outlet, which only allows the blood in the syringe 11 to flow out and enter the diversion funnel 22. The detection closed box 2 includes a sterile sealed box body 21, a diversion funnel 22 and a collection box 23. The sterile sealed box 21 is arranged outside the left side of the injection syringe 11, and the diverter 22 and the collection box 23 are arranged inside the sterile sealed box 21, and the bottom outlet of the diverter 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 diverter 22. The gauze belt 3 is located between the diverter 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 diverter 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 diverter 22, and the diverter 22 is equivalent to a diversion 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 diverter 22 is as shown in FIG. Figure 5 As shown, Figure 5 As a schematic diagram for removing the sealing cover, a conduit can also be used instead of the guide hopper 22.

[0052] When the piston rod of cylinder 20 moves backward, it drives piston 12 of syringe 1 backward, opening one-way valve I 14 and drawing blood from the vein or arterial catheter through empty needle nipple 13. The blood then enters syringe barrel 11. When the piston rod of cylinder 20 moves forward, one-way valve I 14 closes, opening one-way valve II 15. Piston 12 pushes the blood from syringe barrel 11 through one-way valve II 15 and into diversion funnel 22. The blood is then injected onto gauze band 3. The display then checks for clots. If a clot is present, cylinder 20 is activated again, and blood is drawn from the vein or arterial catheter again, again checking for clots. This process continues until no clots are present. Each withdrawal volume is 2 ml. When the fifth withdrawal, when the volume exceeds 10 ml, withdrawal must be stopped.

[0053] Among them, the gauze belt driving mechanism includes 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 provided in the rear end hole of the guide cylinder 4. A guide groove is provided 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 provided 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 provided on the drive rod 5 in the guide cylinder 4, as shown Figure 6 As shown, the front end of the pre-tension spring 41 is fixedly connected to the inner end of the guide cylinder 4 near the sterile sealed box 21, that is, the front end of the pre-tension spring 41 is fixedly connected to the front end inside 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. The end of the drive rod 5 extending into the sterile sealed box 21 is provided with a pressure plate 52 that can press against the side of the gauze strip 3 and drive the gauze strip 3 to move on the collection box 23 toward the rear end of the guide cylinder 4. Each time the drive rod 5 moves backward, the gauze strip 3 is driven backward once.

[0054] 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 near the end of the rotating shaft 54. One end of the torsion spring 55 is fixedly arranged on the side wall of one end of the pressure 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 axial direction of the driving rod 5, such as Figure 7 As shown, the pull rope 53 passes through the pull rope through hole 56, and one end of the pull rope 53 is connected to the pressure 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 pressure plate 52 is away from the gauze band 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 presses on the side of the gauze band 3 and drives the gauze band 3 to move on the collection box 23 toward the rear end of the guide cylinder 4.

[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 provided 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 Figure 9 As shown, the side of the pressure plate 52 close to the driving rod 5 forms an arc that is adapted to the arc groove 57. A through hole I522 is provided at the top of the pressure plate 52. The rotating shaft 54 ​​passes through the through hole I522. The pressure 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 pressure plate 52. The bottom of the pressure plate 52 is tilted outward to form a pressure portion 521. A through hole II523 is provided on the pressure plate 52 near the pressure portion 521 to facilitate the front end of the pull rope 53 to pass through the through hole II523 and be connected to the pressure 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 pressure plate 52. The pressure plate 52 rotates upward under the action of the two torsion springs 55, that is, when the torsion spring 55 is in a free state, the pressure portion 521 of the pressure plate 52 is upward and away from the gauze belt 3, as shown in FIG. Figure 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 Figure 11 As shown, the two torsion springs 55 generate torque deformation, and 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 toward the rear end of the guide cylinder 4 on the collecting box 23.

[0056] The gauze belt driving mechanism also includes a guide strip plate 6, a positioning guide plate 7 and a separation plate 8. Figure 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 the front to the 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. Figure 13As shown, the guide strip plate 6 is located above the collection box 23 and near the injection syringe 11. The guide strip plate 6 is parallel to the drive 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. The rear end of the positioning guide plate 7 extends toward 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. The front end of the separation plate 8 extends toward 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 a bevel Ⅰ71 with the top facing forward and the bottom facing backward, and the front end of the guide strip plate 6 is a bevel 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 pressure plate turning downward to bypass the gap Ⅰ; the rear end of the guide strip plate 6 is a bevel Ⅲ62 with the top facing backward and the bottom facing forward, the front end of the separation plate 8 is an upper bevel Ⅳ81 with the middle part facing forward and the top facing backward, and the front end of the separation plate 8 is a lower bevel Ⅴ82 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 chute 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 chute 64. The slider 65 slides with the chute 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 chute 64 near the inclined surface III 62. A preload spring 67 is provided between the inner side of the chute 64 and the slider 65 to push the slider 65 out of the inclined surface III 62, that is, one end of the preload spring 67 is connected to the front side of the chute 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, as shown in FIG. Figure 14 Under the action of the preload spring 67 , one end of the slider 65 close to the arcuate inclined surface 66 extends out of the inclined surface III 62 . When the arcuate inclined surface 66 is compressed, the slider 65 slides inwardly into the chute 64 .

[0057] When the piston 12 moves backward in the injection syringe 11, under the action of the pre-tension spring 41 pulling the drive rod 5 forward, the pull rope 53 begins to pull the pressure plate 52, and the two torsion springs 55 generate torque deformation. The pressure plate 52 rotates downward under the action of the pull rope 53, and the pressure 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 portion 521 of the pressure plate 52 continues to rotate downward along the notch I. Figure 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-tensioned 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 collecting box 23, as shown in FIG. Figure 16 When the pressing plate 52 moves to the separating plate 8, the bottom surface of the pressing portion 521 of the pressing plate 52 contacts the upper middle side of the separating plate 8, and then the pressing portion 521 of the pressing plate 52 moves obliquely upward on the upper inclined surface IV81 of the separating plate 8, while the gauze tape 3 below the pressing portion 521 of the pressing plate 52 contacts the upper middle side of the separating plate 8 and then moves obliquely downward along the lower inclined surface V82 of the separating plate 8. At this time, the pressing portion 521 of the pressing plate 52 is separated from the gauze tape 3 below the pressing portion 521. As the pressing portion 521 of the pressing plate 52 moves obliquely upward along the upper inclined surface IV81 of the separating plate 8, Figure 17 As shown, the pressure 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 portion 521 of the pressure plate 52 moves along the upper inclined surface IV 81 and the arc-shaped inclined surface 66 to the top of the slider 65, the slider 65 moves backward again under the restoring force of the return spring 67 without being squeezed by the pressure portion 521. The top of the slider 65 extends out of the inclined surface III 62 and approaches the upper inclined surface IV 81. 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 syringe 11, and the pressure portion 521 of the pressure plate 52 moves forward in the opposite direction, and then slides onto the slider 65. Under the guidance of the slider 65, it slides to the top of the guide strip plate 6. At this time, under the action of the pre-tensioned spring 41, the drive rod 5 is driven to move forward, and the drive rod 5 drives the pressure portion 521 of the pressure plate 52 to move forward above the guide strip plate 6. Figure 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. Figure 19 As shown, a plurality of connecting plates 32 are evenly spaced between the clamping plates 31 at the lower parts of the gauze belt 3, as shown in FIG. Figure 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 presses on the clamping plate 31 on 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 plates 31 on the lower part of the corresponding side. The surface of the guide rails 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. Figure 21 As shown, one end of the gauze strip 3 rests on the collection box 23. Clamps 31 on either side of the gauze strip 3 rest on guide rails 231 on the left and right sides of the collection box 23. By moving the clamps 31 on the guide rails 231 backward, the entire gauze strip 3 moves synchronously backward. The collection box 23 not only supports the gauze strip 3, but also facilitates its movement and collects blood leaked from the gauze strip 3 during testing.

[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 provided on the top cover of the sterile sealed box 21 and is directly opposite to the gauze belt 3 below the diversion hopper 22. The camera 10 is provided under the top cover and is directly opposite to the gauze belt 3 below the diversion hopper 22. In this embodiment, both the magnifying glass observation window 9 and the camera 10 are provided. Medical personnel can check whether there is a blood clot in the extracted blood through the magnifying glass observation window 9, and can also connect the camera 10 to the display screen provided on the sterile sealed box 21 or to 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 make a comparison through the controller. If there is a blood clot on the gauze belt 3, an alarm on the hemodialysis machine can be used to sound an alarm.

[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 near the rear side that cooperates with the external thread on the catheter connector 17. The rear end of the sealing connection sleeve 16 is rotated and sealed with 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. A sterile cotton sleeve 163 is provided on the inner wall of the sealing connection sleeve 16 near the front side. Figure 22 As shown. The sealing film 162 keeps the sealing connection sleeve 16 in a sealed and sterile state, ensuring a sterile state during the docking process and use. During use, the sealing film 162 is torn off, the iodine cap on the catheter connector 17 is unscrewed, and the sealing connection sleeve 16 is put on the catheter connector 17. The sterile cotton sleeve 163 of the sealing connection sleeve 16 disinfects the catheter connector 17 during the covering process. Then, the sealing connection sleeve 16 is rotated so that the internal thread 161 in the sealing connection sleeve 16 is screwed onto the external thread on the catheter connector 17, thereby achieving sterile docking between the syringe 1 and the catheter connector 17. A sealing connection sleeve 16 is provided on the outside of the empty needle nipple 13. When the empty needle nipple 13 is inserted into the catheter connector 17, the sterile 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 and pushed onto the catheter connector 17. This not only disinfects 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, further reducing the chance 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 front limit block 24, the pressure plate 52 corresponds exactly to the notch I; when the sliding sleeve 51 moves to the rear limit block 24, the pressure plate 52 corresponds exactly to the notch II.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. 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 solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should all 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 an injection syringe (11), a piston (12), and a hollow needle nipple (13) disposed on the front end of the injection syringe (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 provided in the empty needle nipple (13), and the piston drive mechanism is provided outside the right side of the injection syringe (11) for driving the piston (12) to move back and forth in the injection syringe (11); a liquid outlet is provided 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 provided in the liquid outlet; The detection closed box (2) includes a sterile sealed box body (21), a diversion 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 diversion hopper (22) and the collection box (23) are arranged in the sterile sealed box body (21), and the bottom outlet of the diversion 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 diversion hopper (22); the gauze belt (3) is located between the diversion 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; The gauze belt driving mechanism includes 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) is provided in the guide cylinder (4) and is axially slidably engaged with the inner wall of the guide cylinder (4); 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); 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).

2. The hemodialysis vascular access patency detector according to claim 1, characterized in that: The gauze belt driving mechanism also includes a drawstring (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 thereof; one end of the torsion spring (55) is fixedly arranged on a side wall of one end of the pressure plate (52); and the other end of the torsion spring (55) is fixedly arranged on the driving rod (5); a drawstring through-hole (56) is axially arranged in the driving rod (5); the drawstring (53) passes through the drawstring through-hole (56); one end of the drawstring (53) is connected to the pressure plate (52) and is close to the other end of the pressure plate (52); and the other end of the drawstring (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 collecting 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 further comprises a guide strip plate (6), a positioning guide plate (7) and a separation plate (8); the guide strip plate (6) is arranged above the collecting 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 gap II is formed 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 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 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 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 chute (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 chute (64). An arc-shaped inclined surface (66) with the top facing backward and the bottom facing forward is provided on the side of the chute (64) near the inclined surface III (62). A preload spring (67) is provided between the inner side of the chute (64) and the slider (65) to push the slider (65) out of the inclined surface III (62). The top surface of the slider (65) is flush with the top surface of the guide strip plate (6).

4. The hemodialysis vascular access patency detector according to claim 3, characterized in that: The two sides of the gauze belt (3) are respectively clamped in the 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 the side of the gauze belt (3) close to the guide cylinder (4) and drives the gauze belt (3) to move on the collecting box (23) toward the rear end of the guide cylinder (4).

5. The hemodialysis vascular access patency detector according to claim 4, characterized in that: A concave guide rail (231) is provided near the inner side of the right side plate and the inner side of the left side plate of the collection box (23), respectively, and cooperates 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).

6. The hemodialysis vascular access patency detector according to claim 5, characterized in that: An arcuate groove (57) is provided on the left side of the driving rod (5) near the front end, the rotating shaft (54) is provided in the arcuate 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 arcuate groove (57) and near the bottom end.

7. The hemodialysis vascular access patency detector according to any one of claims 1 to 6, 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 diversion hopper (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 diversion hopper (22).

8. The hemodialysis vascular access patency detector according to claim 7, characterized in that: The empty needle nipple (13) is provided with a sealing connection sleeve (16) on the outside, and an internal thread (161) is provided on the inner wall of the sealing connection sleeve (16) near the rear side to cooperate with the external thread on the catheter connector (17). 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 the front end of the sealing connection sleeve (16) is provided with a sealing film (162).

9. The hemodialysis vascular access patency detector according to claim 8, 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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