A liquid inlet device for a thrombolytic catheter

Abstract

The application discloses a liquid inlet device of a thrombolytic catheter, which comprises a catheter main body, a sealed box and a propelling assembly. The outer side of the catheter main body is sleeved with an outer pipe, the inner side surface of the outer pipe is provided with a flow guide groove, the inner bottom wall of the flow guide groove is provided with a plurality of flow guide holes, the outer pipe end part located on the outer side of a human body is fixedly connected with a flow guide ring which is internally hollow, each flow guide groove is communicated with the inner part of the flow guide ring, the sealed box is placed with a bag body which internally contains an anticoagulant liquid, the sealed box is communicated with the inner part of the flow guide ring through a branch pipe, and the propelling assembly is communicated with the inner part of the sealed box through a connecting pipe. The sealed box is inflated through the propelling assembly, the air pressure is enhanced to extrude the bag body when the gas enters the sealed box, the anticoagulant liquid in the bag body is slowly and continuously flowed into a plurality of flow guide grooves through the branch pipe, and then is flowed out of a blood vessel cavity, so that the formation of a cavity intramural thrombus is reduced, and then the whole blood vessel cavity continuously has a trace amount of anticoagulant drug, which can effectively dissolve the thrombus in the blood vessel cavity and on the outer wall of the thrombolytic catheter.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical auxiliary tools, in particular to a liquid inlet device of a thrombolytic catheter. BACKGROUND

[0002] For patients with deep venous thrombosis of lower extremity, usually venipuncture is performed at the femoral vein and popliteal vein, and a catheter is indwelled for local continuous thrombolytic therapy. The thrombolytic catheter is usually indwelled for 3-5 days. During the indwelling period of the catheter, the blood flow velocity in the blood vessel lumen will slow down due to the occupation of a certain space in the blood vessel lumen by the catheter, and in addition, the blood of the patient is in a hypercoagulable state, and fresh thrombus will be formed in the blood vessel to varying degrees, which will easily reduce the treatment effect.

[0003] In order to solve the above problems, it is necessary to continuously inject anticoagulant liquid into the catheter to keep the entire blood vessel in a low coagulation state to prevent thrombus from being formed again, so as to achieve the thrombolytic treatment effect. Therefore, high-concentration anticoagulant drugs need to be manually injected into the catheter every 8 hours to reduce the occurrence of pipe blockage, but such operation increases the workload of doctors, and the injection amount of the anticoagulant liquid cannot be accurately controlled, and when the injection amount is too small, thrombus is easily formed again. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides a liquid inlet device of a thrombolytic catheter to solve the problem that in order to prevent blood coagulation, high-concentration anticoagulant drugs need to be manually injected into the catheter every 8 hours during the period of continuously injecting anticoagulant liquid into the catheter, which reduces the occurrence of pipe blockage, and the injection amount of the anticoagulant liquid cannot be accurately controlled, and when the injection amount is too small, thrombus is easily formed again.

[0005] To solve the above technical problems, the technical scheme adopted by the present application is as follows:

[0006] A liquid inlet device of a thrombolytic catheter, comprising:

[0007] A catheter body, an outer tube is sleeved on the outer side of the catheter body, a plurality of flow guide grooves are formed on the inner side surface of the outer tube along the axial direction, a plurality of flow guide holes are formed on the inner bottom wall of each flow guide groove, the flow guide holes are communicated with the outer side surface of the outer tube, the outer tube end portion located on the outer side of the human body is fixedly connected with a flow guide ring which is hollow inside, and each flow guide groove is communicated with the inside of the flow guide ring;

[0008] A sealing box, a cavity is arranged in the inside of the sealing box, a bag body which contains anticoagulant liquid inside is placed in the cavity, a branch pipe is communicated with one end of the sealing box, a sealing hole is formed on the other end of the sealing box, a sealing element is fixedly arranged in the sealing hole, one end of the branch pipe is communicated with the inside of the flow guide ring, and the other end of the branch pipe extends through and penetrates into the inside of the sealing box and is communicated with the inside of the bag body; and

[0009] The propelling assembly is communicated with a connecting pipe at one end, and the end of the connecting pipe away from the propelling assembly can be inserted into the sealing element, so that the connecting pipe communicates with the inside of the sealing box, the sealing box is inflated by the propelling assembly, and then the air pressure in the sealing box enhances the extrusion of the bag body.

[0010] The liquid inlet device of the thrombolytic catheter,

[0011] Further, the sealing box comprises a box body and a box cover, one side of the box body is provided with an opening, an annular insertion slot is formed on the end side of the opening of the box body, and elastic pads are attached to the inner wall of the annular insertion slot, and the side of the box cover is fixedly provided with an annular insertion plate which can be inserted into the annular insertion slot and is in interference fit with the elastic pads.

[0012] Further, the sealing element comprises a first sealing cylinder, a second sealing cylinder, a sealing column, a sealing spring, a sealing disc and a sealing ring plate, the sealing disc is fixedly arranged on the inner side of one end of the first sealing cylinder through a fixing rod, the outer side of the sealing ring plate is fixedly connected to the inner side of the other end of the first sealing cylinder, the second sealing cylinder is coaxially sleeved in the first sealing cylinder, and one end surface of the second sealing cylinder is fixedly connected to the side surface of the sealing disc, the length of the first sealing cylinder is less than the length of the second sealing cylinder, and the inner diameter of the first sealing cylinder is greater than the outer diameter of the second sealing cylinder, the sealing column is slidably sleeved in the second sealing cylinder, and the diameter of the sealing column is the same as the inner diameter of the second sealing cylinder, the second sealing cylinder is provided with the sealing spring, one end of the sealing spring is fixedly connected to the sealing disc, and the other end is fixedly connected to the end surface of the sealing column close to the sealing disc, a plurality of first air holes penetrating through the side wall of the second sealing cylinder are formed in the axial direction, and the sealing column can block the first air holes when sliding in the second sealing cylinder, the end of the connecting pipe away from the propelling assembly is inserted into the sealing ring plate, the outer side of the connecting pipe is sealingly attached to the inner side of the sealing ring plate and is in sliding connection, and a plurality of second air holes penetrating through the end of the connecting pipe inserted into the first sealing cylinder are formed.

[0013] Further, a first clamping groove is formed in the end surface of the sealing ring plate in the axial direction, a plurality of second clamping grooves uniformly distributed in the length direction are formed in the inner side wall of the first clamping groove, the number of the second clamping grooves is the same as that of the first air holes, and a clamping block is fixedly arranged on the outer side of the end of the connecting pipe inserted into the first sealing cylinder, when the connecting pipe is inserted into the first sealing cylinder, the clamping block slides into the first clamping groove and is clamped in the second clamping grooves at different positions.

[0014] Further, a sealing pad is attached to the inner side of the sealing ring plate, and the end of the connecting pipe can be inserted into the sealing ring plate and sealingly attached to the sealing pad.

[0015] Further, the advancing assembly comprises a support plate, a syringe, a gear set, a screw pipe, a screw rod and a motor, the syringe is fixedly arranged at one end of the top surface of the support plate through a support, the front end of the syringe is communicated with the end of the connecting pipe away from the sealing element, the other end of the top surface of the support plate is provided with the motor, the screw pipe is rotatably arranged above the top surface of the support plate through a support plate, one end of the screw rod is inserted into the screw pipe and is threadedly connected, the other end of the screw rod abuts against the piston rod at the rear end of the syringe, and the output shaft of the motor is rotatably connected with the screw pipe through the gear set.

[0016] Further, the gear set comprises a rotating shaft, a main gear, a first slave gear, a second slave gear and a third slave gear, the rotating shaft is fixedly connected with the output shaft of the motor, the main gear is fixedly sleeved on the rotating shaft, the first slave gear, the second slave gear and the third slave gear are fixedly sleeved on the outside of the screw pipe, the number of teeth on the first slave gear is less than the number of teeth on the second slave gear, the number of teeth on the second slave gear is less than the number of teeth on the third slave gear, and the main gear can be in meshing connection with the first slave gear, the second slave gear or the third slave gear.

[0017] Further, the top surface of the support plate and located at the position of the motor is provided with a first sliding groove in the length direction, the inner side wall of the first sliding groove is provided with three second sliding grooves which are equally spaced, the bottom surface of the motor is fixedly provided with a sliding block, the sliding block and the second sliding grooves are T-shaped structures, the sliding block is slidably arranged in the first sliding groove, the sliding block can slide into the second sliding groove from the first sliding groove, the main gear is in meshing connection with the first slave gear, the second slave gear or the third slave gear, the first sliding groove is provided with an expansion rod, the inner side wall of the first sliding groove away from the second sliding grooves is provided with a limiting hole, one end of the expansion rod abuts against the side surface of the sliding block, and the other end of the expansion rod is inserted into the limiting hole and abuts against.

[0018] Further, the outer side surface of the connecting pipe is provided with a plurality of score lines, the number of the score lines is the same as the number of the second clamping grooves, the distance between the adjacent two first air holes, the distance between the adjacent two second clamping grooves and the distance between the adjacent two score lines are all the same.

[0019] The liquid inlet device of the thrombolytic catheter drives the screw rod to move through the motor, air in the syringe is discharged, then the air enters the sealed box through the sealing element to generate air pressure to extrude the bag, the anticoagulant liquid in the bag is input into the flow guide groove of the outer pipe, and then the anticoagulant liquid flows into the blood vessel cavity of the outer pipe, so that the formation of mural thrombus in the pipe cavity is reduced; and since the speed of the advancing assembly extruding the bag is slow and continuous, a small amount of anticoagulant drug exists in the whole blood vessel cavity continuously, which can effectively dissolve the thrombus in the blood vessel cavity and on the outer wall of the thrombolytic catheter, so that the treatment efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the specific embodiments of the present application, the drawings needed to be used in the specific embodiments will be briefly introduced. In all the drawings, the elements or parts are not necessarily drawn according to the actual proportion.

[0021] Figure 1 is a top view of the present application;

[0022] Figure 2 is a sectional view of the outer tube and the inner tube;

[0023] Figure 3 is a sectional view of the sealing element;

[0024] Figure 4 is a Figure 3 is a side view of the sealing element in the A direction;

[0025] Figure 5 is a Figure 1 is a sectional view of B-B;

[0026] Figure 6 is a top view of the advancing assembly;

[0027] Figure 7 is a side view of the advancing assembly;

[0028] Figure 8 is a top view of the support plate;

[0029] Reference signs:

[0030] 10 - catheter body;

[0031] 20 - outer tube, 21 - flow guide groove, 22 - flow guide hole, 23 - flow guide ring, 24 - branch tube;

[0032] 30 - sealing box, 31 - cavity, 32 - box body, 33 - box cover, 34 - annular insertion slot, 35 - elastic pad, 36 - annular insertion plate, 37 - bag body;

[0033] 40 - advancing assembly, 41 - support plate, 411 - first sliding groove, 412 - second sliding groove, 413 - limiting hole, 42 - syringe, 431 - rotating shaft, 432 - main gear, 433 - first slave gear, 434 - second slave gear, 435 - third slave gear, 44 - screw tube, 45 - screw rod, 46 - motor, 47 - sliding block, 48 - telescopic rod, 49 - support plate;

[0034] 50 - sealing element, 51 - first sealing cylinder, 511 - first clamping groove, 512 - second clamping groove, 52 - second sealing cylinder, 521 - first air hole, 53 - sealing column, 54 - sealing spring, 55 - sealing disc, 551 - fixing rod, 56 - sealing ring plate, 58 - sealing pad;

[0035] 60 - connecting pipe, 61 - scale, 62 - second vent hole, 63 - clamping block. DETAILED DESCRIPTION

[0036] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0037] In the description of the present application, it should be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation and positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the indicated position or element must have a particular orientation, be constructed and operated in a particular manner, and therefore cannot be understood as a limitation on the present application.

[0038] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified.

[0039] Please refer to Figure 1 and Figure 2The application provides a liquid inlet device of a thrombolytic catheter, which comprises a catheter main body 10, a sealed box 30 and a propelling assembly 40, the outer side of the catheter main body 10 is sleeved with an outer tube 20, a plurality of flow guide grooves 21 are formed in the inner side of the outer tube 20 along the axial direction, a plurality of flow guide holes 22 are formed in the inner bottom wall of each flow guide groove 21, the flow guide holes 22 are communicated with the outer side of the outer tube 20, the flow guide holes 22 are formed on the outer tube 20 penetrating into the human body, the end of the outer tube 20 located outside the human body is fixedly connected with a flow guide ring 23 which is hollow, each flow guide groove 21 is communicated with the inside of the flow guide ring 23, the inside of the sealed box 30 is provided with a cavity 31, the inside of the cavity 31 is in a closed state, a bag 37 containing an anticoagulant liquid is arranged in the cavity 31, the bag 37 is soft and can be crushed under pressure, the sealed box 30 is communicated with the inside of the flow guide ring 23 through a branch pipe 24, and the inside of the sealed box 30 is communicated with the propelling assembly 40 through a connecting pipe 60. The sealed box 30 is inflated by the propelling assembly 40, so that the gas enters the sealed box 30, the inside of the sealed box 30 is a closed environment, and then the air pressure in the sealed box 30 is enhanced to extrude the bag 37, so that the anticoagulant liquid in the bag 37 flows into the plurality of flow guide grooves 21 through the branch pipe 24, and then flows out of the flow guide holes 22 and mixes with the blood around the outer tube 20, so that the blood coagulation is prevented and the thrombus around the outer tube 20 is prevented from being formed; moreover, the speed of the propelling assembly 40 pressing the bag 37 is slow and continuous, so that the outer tube 20 continuously releases a small amount of anticoagulant liquid, and then a small amount of anticoagulant liquid continuously exists in the whole blood vessel cavity, which can effectively dissolve the thrombus in the blood vessel cavity and on the outer wall of the thrombolytic catheter, so that the treatment effect is improved.

[0040] The sealed box 30 is made of transparent material, so that the condition of the bag 37 in the cavity 31 can be observed through the sealed box 30, and the remaining amount of the anticoagulant liquid can be known in time, so that the sealed box 30 can be replaced in time; one end of the sealed box 30 is communicated with the branch pipe 24, the other end of the sealed box 30 is provided with a sealed hole, a sealing piece 50 is fixedly arranged in the sealed hole, so that the connecting pipe 60 is communicated with the inside of the sealed box 30, one end of the branch pipe 24 is communicated with the inside of the flow guide ring 23, and the other end of the branch pipe 24 extends through the sealed box 30 and is communicated with the inside of the bag 37; one end of the propelling assembly 40 is communicated with the connecting pipe 60, and the end of the connecting pipe 60 away from the propelling assembly 40 can be inserted into the sealing piece 50. The sealing piece 50 is arranged to enhance the sealing performance of the connecting pipe 60 communicated with the inside of the sealed box 30, so that the air leakage in the sealed box 30 is avoided, the air pressure in the cavity 31 is reduced, and the output of the anticoagulant liquid is affected.

[0041] Please refer to Figure 3 and Figure 4, specifically, the sealing member 50 comprises a first sealing cylinder 51, a second sealing cylinder 52, a sealing column 53, a sealing spring 54, a sealing disc 55 and a sealing ring plate 56, the sealing disc 55 is fixedly arranged on the inner side of one end of the first sealing cylinder 51 through a fixing rod 551, the outer side of the sealing ring plate 56 is fixedly connected to the inner side of the other end of the first sealing cylinder 51, the second sealing cylinder 52 is coaxially sleeved in the first sealing cylinder 51, and one end surface of the second sealing cylinder 52 is fixedly connected to the side surface of the sealing disc 55, the length of the first sealing cylinder 51 is less than the length of the second sealing cylinder 52, and the inner diameter of the first sealing cylinder 51 is greater than the outer diameter of the second sealing cylinder 52, so that there is a gap between the first sealing cylinder 51 and the second sealing cylinder 52, facilitating the passage of gas, the sealing column 53 is slidably sleeved in the second sealing cylinder 52, and the diameter of the sealing column 53 is the same as the inner diameter of the second sealing cylinder 52, the sealing spring 54 is arranged in the second sealing cylinder 52, one end of the sealing spring 54 is fixedly connected to the sealing disc 55, and the other end is fixedly connected to the end surface of the sealing column 53 close to the sealing disc 55, a plurality of first air holes 521 are formed in the side wall of the second sealing cylinder 52 in the axial direction, and the sealing column 53 can block the first air holes 521 when sliding in the second sealing cylinder 52, by sliding the sealing column 53 in the second sealing cylinder 52, the blocked first air holes 521 are opened, and then the gas flows into the first sealing cylinder 51 through the first air holes 521; the end of the connecting pipe 60 away from the advancing assembly 40 is inserted into the sealing ring plate 56, and the outer side of the connecting pipe 60 is sealingly and slidably connected to the inner side of the sealing ring plate 56, and a plurality of second air holes 62 are formed in the end of the connecting pipe 60 inserted into the first sealing cylinder 51.

[0042] When the end of the connecting pipe 60 is inserted into the inner side of the sealing ring plate 56, the end of the connecting pipe 60 abuts against the sealing column 53 and continues to penetrate until the blocked first air holes 521 are leaked, at this time the connecting pipe 60 pushes the sealing column 53 to slide and press the sealing spring 54, so that the sealing spring 54 contracts, and in the absence of the pushing of the connecting pipe 60, the restoring force of the sealing spring 54 is used to prevent the sliding of the sealing column 53, so that the sealing column 53 blocks the remaining first air holes 521; then the advancing assembly 40 fills the gas into the connecting pipe 60, so that the gas flows out of the first air holes 521, and then the gas enters the first sealing cylinder 51 through the first air holes 521, and finally the gas flows out of the first sealing cylinder 51 into the cavity 31 to press the bag 37; and according to the desired inflation speed, the length of the connecting pipe 60 inserted into the first sealing cylinder 51 is changed, so that the number of opened first air holes 521 is selected, and the amount of gas filled into the cavity 31 is changed.

[0043] Preferably, one end surface of the sealing ring plate 56 is provided with a first clamping groove 511 in the axial direction, a plurality of second clamping grooves 512 are uniformly distributed in the length direction on the inner side wall of the first clamping groove 511, the number of the second clamping grooves 512 is the same as that of the first air holes 521, the end portion of the connecting pipe 60 is fixedly provided with a clamping block 63 on the outer side surface of the first sealing cylinder 51, when the connecting pipe 60 is inserted into the first sealing cylinder 51, the clamping block 63 slides into the second clamping grooves 512 at different positions and is clamped therein; the inner side of the sealing ring plate 56 is bonded with a sealing gasket 57, the end portion of the connecting pipe 60 can be inserted into the sealing ring plate 56 and sealingly abut with the sealing gasket 57, the corresponding position of the sealing gasket 57 is also provided with a first clamping groove 511 for the clamping block 63 to pass through, and the sealing gasket 57 can enhance the sealing between the connecting pipe 60 and the sealing ring plate 56 to prevent air leakage.

[0044] When the end portion of the connecting pipe 60 is inserted into the inner side of the sealing ring plate 56, the clamping block 63 is simultaneously inserted into the first clamping groove 511, and after the clamping block 63 slides to the position of the second clamping groove 512, the connecting pipe 60 is rotated to make the clamping block 63 clamped in the second clamping groove 512; by clamping the clamping block 63 in the second clamping groove 512 at different positions, the connecting pipe 60 is inserted into the first sealing cylinder 51 to a corresponding depth, so that the connecting pipe 60 pushes the sealing column 53 to open a corresponding number of first air holes 521. Moreover, the clamping block 63 clamped in the second clamping groove 512 can prevent the connecting pipe 60 from being separated from the first sealing cylinder 51.

[0045] Furthermore, the outer side surface of the connecting pipe 60 is provided with a plurality of score lines 61, the number of the score lines 61 is the same as that of the second clamping grooves 512, the spacing between adjacent two first air holes 521, the spacing between adjacent two second clamping grooves 512 and the spacing between adjacent two score lines 61 are all the same. Among them, the number of the score lines 61, the first air holes 521 and the first clamping grooves 511 is three. Through the setting of the score lines 61, the positions of the three score lines 61 correspond to the positions of the three first clamping grooves 511 one by one, when the connecting pipe 60 is inserted into the first sealing cylinder 51, the first score line 61 of the connecting pipe 60 is flush with the end surface of the first sealing cylinder 51, at this time the clamping block 63 slides to the position of the first second clamping groove 512, the sealing column 53 slides out of the first first air hole 521, and the same is true for the subsequent.

[0046] As Figure 1 and 5As shown, in the embodiment, the sealing box 30 comprises a box body 32 and a box cover 33, the box body 32 has an opening on one side, and an annular slot 34 is formed on the opening end side of the box body 32, and an elastic pad 35 is pasted on the inner wall of the annular slot 34, and the annular slot 36 is fixedly arranged on the side of the box cover 33, the annular slot 36 can be inserted into the annular slot 34, and the annular slot 36 is in interference fit with the elastic pad 35. When the annular slot 36 can be inserted into the annular slot 34, the elastic pad 35 fills the gap between the annular slot 36 and the annular slot 34, so that the elastic pad 35 is flattened, preventing the gas in the cavity 31 from leaking out; and the plug-in connection between the box body 32 and the box cover 33 facilitates the replacement of the bag body 37.

[0047] As shown in Figure 1 , Figure 6 and 7 , in the embodiment, the advancing assembly 40 comprises a support plate 41, a syringe 42, a gear set, a screw pipe 44, a screw rod 45 and a motor 46, the syringe 42 is fixedly arranged at one end of the top surface of the support plate 41 through a support, the front end of the syringe 42 is in communication with the end of the connecting pipe 60 away from the sealing element 50, the other end of the top surface of the support plate 41 is provided with the motor 46, the screw pipe 44 is rotatably arranged above the top surface of the support plate 41 through a support plate 49, one end of the screw rod 45 is inserted into the screw pipe 44 in threaded connection, the other end abuts against the piston rod at the rear end of the syringe 42, and the output shaft of the motor 46 is rotatably connected with the screw pipe 44 through the gear set. The gear set has a step performance, and the speed of the motor 46 driving the screw pipe 44 can be changed through the gear set, so as to control the speed of the screw rod 45 pushing the piston rod on the syringe 42, so as to adjust the air pressure enhancement speed of the bag body 37. The top of the support plate 49 is provided with a support hole, a bearing is fixedly arranged in the support hole, and the outer side surface of the screw pipe 44 is fixedly connected with the inner side surface of the bearing.

[0048] In use, the piston rod of the syringe 42 is pulled out to the maximum length, the motor 46 is started, the motor 46 drives the screw pipe 44 to rotate through the gear set, because the position of the screw pipe 44 is fixed, the end of the screw rod 45 protrudes out of the screw pipe 44, and then the screw rod 45 pushes the piston rod of the support to continuously slide into the inside of the syringe 42, so that the air in the inside of the syringe 42 is discharged and flows into the connecting pipe 60.

[0049] The gear set comprises a rotating shaft 431, a main gear 432, a first slave gear 433, a second slave gear 434 and a third slave gear 435. The rotating shaft 431 is fixedly connected to the output shaft of the motor 46. The main gear 432 is fixedly sleeved on the rotating shaft 431. The first slave gear 433, the second slave gear 434 and the third slave gear 435 are fixedly sleeved on the outer side of the screw pipe 44 in sequence. The number of teeth on the first slave gear 433 is less than the number of teeth on the second slave gear 434, and the number of teeth on the second slave gear 434 is less than the number of teeth on the third slave gear 435. The main gear 432 can be in meshing connection with the first slave gear 433, the second slave gear 434 or the third slave gear 435. By changing the meshing position of the main gear 432, the screw pipe 44 can generate different rotating speeds, so as to facilitate the control of the moving speed of the piston rod of the syringe 42 pushed by the screw rod 45.

[0050] As shown in Figure 8 The top surface of the support plate 41 and the position of the motor 46 are provided with a first sliding groove 411 along the length direction. The inner side wall of the first sliding groove 411 is provided with three second sliding grooves 412 which are equally spaced. The bottom surface of the motor 46 is fixedly provided with a sliding block 47. The sliding block 47 and the second sliding grooves 412 are both T-shaped structures. The sliding block 47 is slidably arranged in the first sliding groove 411. The sliding block 47 can slide into the second sliding grooves 412 from the first sliding groove 411, so that the main gear 432 is in meshing connection with the first slave gear 433, the second slave gear 434 or the third slave gear 435. The first sliding groove 411 is provided with an extension rod 48. The extension rod 48 has an extension performance and can be compressed after an external force is applied. The inner side wall of the first sliding groove 411 away from the second sliding grooves 412 is provided with a limiting hole 413. One end of the extension rod 48 abuts against the side surface of the sliding block 47, and the other end is inserted into the limiting hole 413 and abuts against it. The sliding block 47 moves to the first second sliding groove 412, so that the main gear 432 meshes with the first slave gear 433. The sliding block 47 moves to the second second sliding groove 412, so that the main gear 432 meshes with the second slave gear 434. The sliding block 47 moves to the third second sliding groove 412, so that the main gear 432 meshes with the third slave gear 435. The tooth surface width of the first slave gear 433, the second slave gear 434 or the third slave gear 435 is greater than the tooth surface width of the main gear 432, so as to facilitate the meshing of the main gear 432.

[0051] When the engagement position of the motor 46 needs to be changed, the telescopic rod 48 is compressed, then taken out from the first sliding groove 411, then the motor 46 is pushed to move the sliding block 47 in the first sliding groove 411 to the second sliding groove 412 at a different position, so that the screw pipe 44 obtains the required rotating speed; then the one end of the telescopic rod 48 in the compressed state is abutted against the sliding block 47, the telescopic rod 48 is stretched, so that the other end of the telescopic rod 48 is abutted against the limiting hole 413, thereby fixing the motor 46; the telescopic rod 48 provides an acting force to the motor 46, so that the engagement state of the main gear 432 is not easy to separate.

[0052] The working principle of the present application is as follows: in use, the catheter main body 10 and the outer tube 20 are inserted into the patient's body, first, according to the required rotating speed of the screw pipe 44, the motor 46 is pushed into the corresponding second sliding groove 412, the position of the sliding block 47 is fixed by the telescopic rod 48, then the piston rod on the syringe 42 is pulled out to the maximum length, so that the end of the screw rod 45 is abutted against the piston rod; then according to the required inflation speed, the end of the connecting pipe 60 is inserted into the first sealing cylinder 51, so that the connecting pipe 60 is abutted against the sealing column 53 to slide, the first air vent 521 is leaked, the connecting pipe 60 is rotated, so that the clamping block 63 is clamped in the second clamping groove 512; then the motor 46 is started to drive the screw pipe 44 to rotate, thereby driving the screw rod 45 to push the piston rod to slide, the air in the syringe 42 is discharged into the connecting pipe 60 and then flows into the second sealing cylinder 52, then the gas passes through the first air vent 521 into the first sealing cylinder 51, when the gas flows from the first sealing cylinder 51 into the cavity 31 of the sealing box 30, the air pressure is generated to extrude the bag body 37, the anticoagulant liquid in the bag body 37 is extruded to flow into the flow guide groove 21 through the branch pipe 24, finally the anticoagulant liquid flows from the flow guide hole 22 to the outside of the outer tube 20 and merges into the blood, thereby preventing the coagulation of the blood.

[0053] The beneficial effects of the present application are as follows: the liquid inlet device of the thrombolytic catheter drives the screw rod 45 to move by the motor 46, the air in the syringe 42 is discharged, then the air enters the sealing box 30 through the sealing element 50 to generate air pressure to extrude the bag body 37, the anticoagulant liquid in the bag body 37 is input into the flow guide groove 21 of the outer tube 20, thereby making the anticoagulant liquid flow into the blood vessel cavity of the outer tube 20, reducing the formation of mural thrombus in the lumen, and also making the outer tube 20 unable to form thrombus around; and because the speed of the pushing assembly 40 extruding the bag body 37 is slow and continuous, the outer tube 20 continuously releases a small amount of anticoagulant liquid, thereby making a small amount of anticoagulant exist in the whole blood vessel cavity, which can effectively dissolve the thrombus in the blood vessel cavity and on the outer wall of the thrombolytic catheter, thereby achieving the effect of treatment enhancement.

[0054] The above examples are only used to illustrate the technical solutions of the present application, but not limit the present application; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can be modified, or some or all of the technical features can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the specification of the present application.

Claims

1. A fluid inlet device for a thrombolytic catheter, characterized in that, include: The catheter body has an outer tube sleeved on its outer side. The inner side of the outer tube has multiple guide grooves along the axial direction. The inner bottom wall of each guide groove has multiple guide holes. The guide holes are connected to the outer side of the outer tube. The end of the outer tube located on the outside of the human body is fixedly connected to an internally hollow guide ring. Each guide groove is connected to the inside of the guide ring. A sealed box has an internal cavity containing a bag filled with anticoagulant solution. One end of the sealed box is connected to a branch pipe, and the other end has a sealing hole with a sealing element fixed inside. One end of the branch pipe connects to the interior of a guide ring, and the other end extends through the sealed box and communicates with the interior of the bag. The propulsion assembly has a connecting pipe at one end, and the end of the connecting pipe away from the propulsion assembly can be inserted into the seal, so that the connecting pipe connects to the inside of the sealed box. The propulsion assembly inflates the sealed box, thereby increasing the air pressure inside the sealed box and squeezing the bag.

2. The fluid inlet device for a thrombolytic catheter according to claim 1, characterized in that: The sealed box includes a box body and a box lid. The box body has an opening on one side, and an annular slot is provided on the side of the opening end of the box body. An elastic pad is attached to the inner wall of the annular slot. An annular insert plate is fixed on the side of the box lid. The annular insert plate can be inserted into the annular slot, and the annular insert plate and the elastic pad are interference fit.

3. The fluid inlet device for a thrombolytic catheter according to claim 1, characterized in that: The sealing element includes a first sealing cylinder, a second sealing cylinder, a sealing post, a sealing spring, a sealing disc, and a sealing ring plate. The sealing disc is fixedly mounted on the inner side of one end of the first sealing cylinder by a fixing rod. The outer side of the sealing ring plate is fixedly connected to the inner side of the other end of the first sealing cylinder. The second sealing cylinder is coaxially sleeved inside the first sealing cylinder, and one end face of the second sealing cylinder is fixedly connected to the side of the sealing disc. The length of the first sealing cylinder is less than the length of the second sealing cylinder, and the inner diameter of the first sealing cylinder is greater than the outer diameter of the second sealing cylinder. The sealing post is slidably sleeved inside the second sealing cylinder, and the diameter of the sealing post is... The diameter is the same as the inner diameter of the second sealing cylinder. The second sealing cylinder is equipped with a sealing spring, one end of which is fixedly connected to the sealing disc, and the other end is fixedly connected to the end face of the sealing column near the sealing disc. Multiple through first vent holes are opened on the side wall of the second sealing cylinder along the axial direction. The sealing column can slide inside the second sealing cylinder to block the first vent holes. The end of the connecting pipe away from the propulsion component is inserted into the sealing ring plate, and the outer side of the connecting pipe is sealed and slidably connected to the inner side of the sealing ring plate. Multiple through second vent holes are opened on the side of the end of the connecting pipe inserted into the first sealing cylinder.

4. The fluid inlet device for a thrombolytic catheter according to claim 3, characterized in that: A first snap-fit ​​groove is formed on one end face of the sealing ring plate along the axial direction. A plurality of second snap-fit ​​grooves are formed on the inner side wall of the first snap-fit ​​groove, which are evenly distributed in the length direction. The number of second snap-fit ​​grooves is the same as the number of first vent holes. A snap-fit ​​block is fixed on the outer side of the end of the connecting pipe that is inserted into the first sealing cylinder. When the connecting pipe is inserted into the first sealing cylinder, the snap-fit ​​block slides into the first snap-fit ​​groove and snaps into the second snap-fit ​​grooves at different positions.

5. The fluid inlet device for a thrombolytic catheter according to claim 4, characterized in that: A sealing gasket is bonded to the inner side of the sealing ring plate, and the end of the connecting pipe can be inserted into the sealing ring plate and sealed and fitted with the sealing gasket.

6. The fluid inlet device for a thrombolytic catheter according to claim 1, characterized in that: The propulsion assembly includes a support plate, a syringe, a gear set, a helical tube, a screw, and a motor. The syringe is fixedly mounted on one end of the top surface of the support plate via a support. The front end of the syringe is connected to the end of the connecting tube away from the seal. The motor is located at the other end of the top surface of the support plate. The helical tube is rotatably mounted above the top surface of the support plate via a support plate. One end of the screw is inserted into the internal thread of the helical tube and connected to it, while the other end abuts against the piston rod at the rear end of the syringe. The output shaft of the motor is rotatably connected to the helical tube via a gear set.

7. The fluid inlet device for a thrombolytic catheter according to claim 6, characterized in that: The gear set includes a rotating shaft, a main gear, a first driven gear, a second driven gear, and a third driven gear. The rotating shaft is fixedly connected to the output shaft of the motor. The main gear is fixedly sleeved on the rotating shaft. The first driven gear, the second driven gear, and the third driven gear are fixedly sleeved on the outside of the solenoid. The number of teeth on the first driven gear is less than the number of teeth on the second driven gear, and the number of teeth on the second driven gear is less than the number of teeth on the third driven gear. The main gear can mesh with the first driven gear, the second driven gear, or the third driven gear.

8. The fluid inlet device for a thrombolytic catheter according to claim 7, characterized in that: The support plate has a first groove along its length on its top surface at the location of the motor. The inner wall of the first groove has three equally spaced second grooves. A slider is fixedly mounted on the bottom surface of the motor. Both the slider and the second groove are T-shaped structures. The slider is slidably mounted in the first groove and can slide from the first groove into the second groove, so that the main gear meshes with the first, second, or third driven gear. A telescopic rod is provided in the first groove. A limiting hole is provided on the inner wall of the first groove away from the second groove. One end of the telescopic rod abuts against the side of the slider, and the other end is inserted into the limiting hole.

9. The fluid inlet device for a thrombolytic catheter according to claim 5, characterized in that: The outer surface of the connecting tube is provided with a number of engraved lines. The number of engraved lines is the same as the number of second snap-fit ​​grooves. The spacing between two adjacent first vent holes, the spacing between two adjacent second snap-fit ​​grooves, and the spacing between two adjacent engraved lines are all the same.

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