Intravenous infusion auxiliary device

Abstract

The present invention relates to an intravenous infusion auxiliary device, which belongs to the technical field of medical devices, and solves the problem that the indwelling needle in the prior art has a poor sealing effect and is easy to be blocked. The present invention includes a seat body, a driving unit, a constant flow unit, a pulse flow unit and a connecting tube, wherein the constant flow unit and the pulse flow unit are both connected to one end of the connecting tube, and the other end of the connecting tube is connected to the indwelling needle; the constant flow unit and the pulse flow unit are both connected to the driving unit. The present invention drives the constant flow unit and the pulse flow unit to work together through the driving unit, which can not only continuously and constantly supply liquid to the indwelling needle, so that a constant positive pressure liquid flow is maintained in the indwelling needle to prevent blood reflux; it can also pulse-supply liquid into the indwelling needle, regularly flush the indwelling needle, and prevent blood from adhering to the catheter tip of the indwelling needle; it realizes multiple tube sealing protection for the indwelling needle, which can effectively prevent the indwelling needle from embolism, thereby improving the tube sealing effect of the indwelling needle.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to an intravenous infusion auxiliary device. Background Art

[0002] Indwelling needles have been widely used clinically due to their significant advantages. However, the reduced activity of patients in bed can slow down or stagnate venous blood flow, the patient's own body or disease factors (diabetes, hyperlipidemia, hypertension, etc.) can cause the body to be in a hypercoagulable state, and the flowing blood impacts the tip of the catheter of the indwelling needle to form a vortex, etc., which can easily lead to microthrombosis at the tip of the catheter and cause the indwelling needle to be blocked. Currently, clinically, nursing staff mainly use heparin to seal the catheter to prevent blood from entering the catheter and forming a blockage. This method is certainly effective, but as the patient moves, some blood still flows into the indwelling needle to form a thrombus, which is still easy to cause the indwelling needle to be blocked. Summary of the invention

[0003] In view of the above analysis, the present invention aims to provide an intravenous infusion auxiliary device to solve the problem of poor sealing effect and easy blockage of the indwelling needle in the prior art.

[0004] The purpose of the present invention is mainly achieved through the following technical solutions:

[0005] An intravenous infusion auxiliary device is used to connect with an indwelling needle and seal the indwelling needle to prevent the indwelling needle from embolism, comprising a seat body, a driving unit, a constant flow unit, a pulse flow unit and a connecting tube; the constant flow unit and the pulse flow unit are both connected to one end of the connecting tube, and the other end of the connecting tube is connected to the indwelling needle; the constant flow unit and the pulse flow unit are both connected to the driving unit, and the driving unit is used to provide driving force for the coordinated action of the constant flow unit and the pulse flow unit; the constant flow unit contains a first working medium, which is used to continuously and constantly supply liquid to the indwelling needle so that a constant positive pressure liquid flows in the indwelling needle; the pulse flow unit contains a second working medium, which is used to pulse-supply liquid to the indwelling needle and flush the indwelling needle at a regular time.

[0006] Furthermore, the constant flow unit includes a first driving component, a first working component and a first connecting component, and the first driving component, the first working component and the first connecting component are connected in sequence; the first driving component is also connected to the driving unit, and the first connecting component is also connected to the connecting pipe.

[0007] Furthermore, the pulse flow unit includes a second driving component, a second working component, a second connecting component and a pulser, and the second driving component, the second working component and the second connecting component are connected in sequence; the pulser is installed in the second connecting component; the second driving component is also connected to the driving unit, and the second connecting component is also connected to the connecting pipe.

[0008] Furthermore, the first working component contains a first working medium, and the second working component contains a second working medium.

[0009] Furthermore, the first driving assembly includes a driving sleeve and a driving plunger, wherein the driving plunger is disposed in the driving sleeve and can slide along the axis of the driving sleeve; the driving sleeve and the driving plunger together form a driving cavity.

[0010] Furthermore, the first working assembly includes a working sleeve and a working piston, wherein the working piston is disposed in the working sleeve and can slide along the axis of the working sleeve; the working sleeve and the working piston together form a working chamber, wherein the working chamber contains a first working medium.

[0011] Furthermore, the first connecting component includes a fixing seat and a joint, the fixing seat is provided with a channel, the joint is slidably arranged in the channel and can be inserted into the working cavity.

[0012] Furthermore, the seat body is provided with a first communicating hole, a second communicating hole and a containing cavity.

[0013] Furthermore, the driving unit includes a motor, a screw, a driving plate and a liquid bag, wherein the screw is mounted in the accommodating chamber and is rotatably connected to the accommodating chamber; the motor is connected to the screw; the liquid bag is arranged in the accommodating chamber, and the liquid bag stores the driving working fluid; the liquid bag is connected to the driving chambers in the first driving component and the second driving component through the first connecting hole and the second connecting hole respectively; the driving plate is arranged in the accommodating chamber, and is passed through the screw, and can slide along the axis of the screw; the driving plate is also fixedly connected to the liquid bag.

[0014] Furthermore, the connecting tube includes a first branch tube, a second branch tube and a main tube, one end of the first branch tube is connected to the first connecting component, and one end of the second branch tube is connected to the second connecting component; the other ends of the first branch tube and the second branch tube are both connected to one end of the main tube; and the other end of the main tube is connected to the indwelling needle.

[0015] The technical solution of the present invention can achieve at least one of the following effects:

[0016] (1) The present invention provides an intravenous infusion auxiliary device, including a seat body, a driving unit, a constant flow unit, a pulse flow unit and a connecting tube, wherein the seat body can be installed on the patient's body; the driving unit, the constant flow unit and the pulse flow unit are all installed on the seat body; the constant flow unit and the pulse flow unit are both connected to one end of the connecting tube, and the other end of the connecting tube is connected to the indwelling needle; the constant flow unit and the pulse flow unit are both connected to the driving unit, and the driving unit is used to provide a driving force for the coordinated action of the constant flow unit and the pulse flow unit; the constant flow unit contains a first working medium, which is used to continuously and constantly feed liquid into the indwelling needle so that a constant flow is maintained in the indwelling needle. Positive pressure liquid flows to prevent blood reflux; the pulse flow unit contains a second working medium, which is used to pulse liquid into the indwelling needle, and regularly flush the indwelling needle to prevent blood from adhering to the tip of the catheter of the indwelling needle; the present invention drives the constant flow unit and the pulse flow unit to work together through a driving unit, which can not only continuously and constantly feed liquid into the indwelling needle, so that a constant positive pressure liquid flow is maintained in the indwelling needle to prevent blood reflux; it can also pulse liquid into the indwelling needle, and regularly flush the indwelling needle to prevent blood from adhering to the tip of the catheter of the indwelling needle; it realizes multiple tube sealing protection for the indwelling needle, which can effectively prevent indwelling needle embolism and improve the tube sealing effect of the indwelling needle.

[0017] (2) The pulse flow unit of the present invention is provided with a pulser in the two connecting components, and the second working medium is converted into a pulse flow by the pulser, and then injected into the indwelling needle in the form of a positive pressure pulse flow through the second branch pipe and the main pipe, thereby achieving pulsed liquid delivery into the indwelling needle, and regularly flushing the indwelling needle to prevent blood from adhering to the catheter tip of the indwelling needle, thereby preventing the formation of a thrombus at the catheter tip of the indwelling needle and avoiding blockage of the indwelling needle.

[0018] (3) The pulse flow unit of the present invention also includes a pulse adjustment mechanism, which includes a control cylinder, a control plunger and a liquid storage cylinder, wherein the liquid storage cylinder contains a control medium; one end of the control cylinder is connected to the second installation cavity, and the other end is connected to the liquid storage cylinder, and the control medium in the liquid storage cylinder can be filled into the control cylinder; the control plunger is arranged in the control cylinder and can slide along the axis of the control cylinder; one end of the control plunger is fixedly connected to the locking spring, and the other end is in contact with the control medium; by filling or extracting the control medium in the liquid storage cylinder into or out of the control cylinder, the control plunger can be adjusted in the control cylinder. The position of the locking spring can be adjusted to adjust the pre-compression amount, thereby adjusting the tightening force of the locking spring on the locking pin plug, and then adjusting the locking time of the pulse piston, so as to adjust the frequency control of the opening and closing of the third connecting hole controlled by the pulse piston, thereby adjusting the frequency of the on-off control channel, and then adjusting the frequency of the pulse flow of the second working medium, so that the pulse flow unit can adjust the pulse flow frequency according to actual conditions, and adjust the frequency of pulse fluid delivery to the indwelling needle without replacing the auxiliary device, thereby improving the applicability, flexibility and reliability of the use of the auxiliary device.

[0019] In the present invention, the above-mentioned technical solutions can also be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the subsequent description, and some advantages can become obvious from the description, or can be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained through the contents particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings are only for the purpose of illustrating particular embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like components throughout the drawings.

[0021] Figure 1 This is a schematic diagram of the structure of the auxiliary device of Example 1 of the present invention;

[0022] Figure 2 It is a structural schematic diagram of a seat body according to Embodiment 1 of the present invention;

[0023] Figure 3 is a cross-sectional view of a seat body according to Embodiment 1 of the present invention;

[0024] Figure 4 is a cross-sectional view of an auxiliary device according to embodiment 1 of the present invention;

[0025] Figure 5 is a cross-sectional view of the first drive assembly or the second drive assembly of Embodiment 1 of the present invention;

[0026] Figure 6 A cross-sectional view of the first working component or the second working component of Embodiment 1 of the present invention;

[0027] Figure 7 A cross-sectional view of a first connecting component or a second connecting component of Embodiment 1 of the present invention;

[0028] Figure 8 is a cross-sectional view of a pulse generator according to embodiment 1 of the present invention;

[0029] Fig. 9 is a cross-sectional view of a mounting base according to Embodiment 1 of the present invention;

[0030] Fig.10 is a cross-sectional view of a pulse piston according to Embodiment 1 of the present invention;

[0031] Fig.11 is a cross-sectional view of an auxiliary device according to embodiment 2 of the present invention;

[0032] Fig.12 for Fig.11 One of the cross-sectional views of the partial enlarged view of center A;

[0033] Fig.13 for Fig.11 The second cross-sectional view of the enlarged part of A in the figure.

[0034] Reference numerals:

[0035] 1. seat body; 11. first mounting groove; 12. second mounting groove; 13. first connecting hole; 14. second connecting hole; 15. accommodating chamber; 2. driving unit; 21. motor; 22. lead screw; 23. driving plate; 3. constant flow unit; 31. first driving assembly; 311. driving sleeve; 312. driving plunger; 313. driving chamber; 32. first working assembly; 321. working sleeve; 322. working piston; 323. working chamber; 33. first connecting assembly; 331. fixing seat; 3311. channel; 332. joint; 333. tightening spring; 4. pulse flow unit; 41. second driving assembly; 42. second working assembly; 43, second connecting assembly; 44, pulser; 441, mounting seat; 4411, first mounting cavity; 4412, second mounting cavity; 4413, third connecting hole; 442, pulse piston; 4421, buffer cavity; 4422, locking hole; 443, expansion membrane; 444, return spring; 445, locking pin plug; 446, locking spring; 45, pulse regulating mechanism; 451, regulating cylinder; 452, regulating plunger; 453, liquid storage cylinder; 454, control piston; 455, regulating screw; 456, regulating knob; 5, connecting pipe; 51, first branch pipe; 52, second branch pipe; 53, main pipe. DETAILED DESCRIPTION

[0036] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0037] Example 1

[0038] A specific embodiment of the present invention discloses an intravenous infusion auxiliary device, which is used to connect with an indwelling needle and seal the indwelling needle to prevent the indwelling needle from embolism; Figure 1 As shown, the auxiliary device includes a seat body 1, a driving unit 2, a constant flow unit 3, a pulse flow unit 4 and a connecting tube 5, wherein the seat body 1 can be installed on the patient's body; the driving unit 2, the constant flow unit 3 and the pulse flow unit 4 are all installed on the seat body 1; the constant flow unit 3 and the pulse flow unit 4 are both connected to one end of the connecting tube 5, and the other end of the connecting tube 5 is connected to the indwelling needle; the constant flow unit 3 and the pulse flow unit 4 are both connected to the driving unit 2, and the driving unit 2 is used to provide a driving force for the coordinated action of the constant flow unit 3 and the pulse flow unit 4; the constant flow unit 3 contains a first working medium, which is used to continuously and constantly supply liquid to the indwelling needle so that a constant positive pressure liquid flow is maintained in the indwelling needle to prevent blood reflux; the pulse flow unit 4 contains a second working medium , which is used to pulse-feed liquid into the indwelling needle and regularly flush the indwelling needle to prevent blood from adhering to the tip of the catheter of the indwelling needle; compared with the prior art, this embodiment can not only continuously and constantly feed liquid into the indwelling needle through the coordinated action of the constant flow unit 3 and the pulse flow unit 4, so that a constant positive pressure liquid flow is maintained in the indwelling needle to prevent blood from flowing back, thereby preventing the formation of thrombus in the indwelling needle and causing blockage of the indwelling needle; it can also pulse-feed liquid into the indwelling needle and regularly flush the indwelling needle to prevent blood from adhering to the tip of the catheter of the indwelling needle, thereby preventing the formation of thrombus at the tip of the catheter of the indwelling needle and causing blockage of the indwelling needle; multiple sealing protections for the indwelling needle are achieved through the constant flow unit 3 and the pulse flow unit 4, which can effectively prevent embolism of the indwelling needle, thereby greatly improving the sealing effect of the indwelling needle.

[0039] Preferably, if Figure 2 and Figure 3 As shown, the seat body 1 is provided with a first mounting groove 11, a second mounting groove 12, a first connecting hole 13, a second connecting hole 14 and a receiving cavity 15, the first mounting groove 11 is provided with a constant flow unit 3, and the second mounting groove 12 is provided with a pulse flow unit 4.

[0040] Preferably, the driving unit 2 includes a motor 21, a lead screw 22, a driving plate 23 and a liquid capsule, wherein the motor 21 is fixedly mounted on the seat body 1 and connected to one end of the lead screw 22; the liquid capsule is arranged in the accommodating chamber 15, and the liquid capsule is used to store the driving working fluid; the liquid capsule is connected to the constant flow unit 3 through the first connecting hole 13, and is connected to the pulse flow unit 4 through the second connecting hole 14; the lead screw 22 is mounted in the accommodating chamber 15 and is rotatably connected to the accommodating chamber 15; the driving plate 23 is arranged in the accommodating chamber 15, and is passed through the lead screw 22, and can slide along the axis of the lead screw 22; the driving plate 23 is fixedly connected to the liquid capsule; the lead screw 22 is driven to rotate by the motor 21 to drive the driving plate 23 to slide along the axis of the lead screw 22 The first connecting hole 13 and the second connecting hole 14 are connected to each other, thereby controlling the driving medium in the liquid bag to be respectively filled into the constant flow unit 3 and the pulse flow unit 4 through the first connecting hole 13 and the second connecting hole 14, so as to drive the constant flow unit 3 and the pulse flow unit 4 to work together, thereby achieving not only continuous and constant liquid supply to the indwelling needle, so that a constant positive pressure liquid flow is maintained in the indwelling needle to prevent blood reflux, thereby preventing thrombus formation in the indwelling needle; but also pulse liquid supply to the indwelling needle, and regularly flush the indwelling needle to prevent blood from adhering to the tip of the catheter of the indwelling needle, thereby preventing thrombus formation at the tip of the catheter of the indwelling needle, that is, achieving multiple tube sealing protection for the indwelling needle, which can effectively prevent embolism of the indwelling needle, thereby greatly improving the tube sealing effect of the indwelling needle.

[0041] Preferably, if Figure 4 As shown, the connecting tube 5 is a Y-shaped tube, including a first branch tube 51, a second branch tube 52 and a main tube 53. One end of the first branch tube 51 is connected to the constant flow unit 3, one end of the second branch tube 52 is connected to the pulse flow unit 4, the other ends of the first branch tube 51 and the second branch tube 52 are both connected to one end of the main tube 53, and the other end of the main tube 53 is connected to the indwelling needle. Through the first branch tube 51 and the main tube 53, the first working medium in the constant flow unit 3 can be continuously and constantly injected into the indwelling needle, so that a constant positive pressure liquid flow is maintained in the indwelling needle to prevent blood reflux; through the second branch tube 52 and the main tube 53, the second working medium in the pulse flow unit 4 can be pulse-injected into the indwelling needle, and the indwelling needle is flushed regularly to prevent blood from adhering to the catheter tip of the indwelling needle.

[0042] Preferably, both the first branch pipe 51 and the second branch pipe 52 are provided with a one-way valve (not shown in the figure), and the one-way valve can prevent the first working medium and the second working medium from flowing back.

[0043] Preferably, the constant flow unit 3 comprises a first driving component 31, a first working component 32 and a first connecting component 33, wherein the first driving component 31, the first working component 32 and the first connecting component 33 are connected in sequence, the first driving component 31 is also connected to the first connecting hole 13, the first connecting component 33 is also connected to the first branch pipe 51, and the first working component 32 contains a first working medium; when in use, the liquid capsule is continuously and constantly compressed, so that the driving medium in the liquid capsule is continuously and constantly filled into the first driving component 31 through the first connecting hole 13, the first driving component 31 drives the first working component 32 to move, and the working medium in the first working component 32 is injected into the indwelling needle through the first connecting component 33 through the first branch pipe 51 and the main pipe 53 in the form of continuous positive pressure constant flow, so as to realize continuous and constant liquid supply into the indwelling needle, so that a constant positive pressure liquid flow is maintained in the indwelling needle, and since a constant positive pressure liquid flow is always maintained in the indwelling needle, it is difficult for blood to flow back into the indwelling needle, thereby preventing the formation of thrombus in the indwelling needle and avoiding the blockage of the indwelling needle.

[0044] Preferably, if Figure 5 , Figure 6 and Figure 7 As shown, the first driving assembly 31 includes a driving sleeve 311 and a driving plunger 312, wherein the driving sleeve 311 is a cylindrical structure; the driving plunger 312 is disposed in the driving sleeve 311 and can slide along the axis of the driving sleeve 311; the driving sleeve 311 and the driving plunger 312 together form a driving cavity 313, and the driving cavity 313 is connected to the liquid capsule through the first communicating hole 13;

[0045] The first working assembly 32 includes a working sleeve 321 and a working piston 322. The working sleeve 321 is a cylindrical structure, and one end is a closed end, and a liquid outlet hole is provided on the closed end; the working piston 322 is arranged in the working sleeve 321 and can slide along the axis of the working sleeve 321; the closed end of the working sleeve 321 and the working piston 322 together form a working chamber 323, and the working chamber 323 is used to contain the first working medium; the working piston 322 is in contact with the driving plunger 312;

[0046] The first connecting assembly 33 includes a fixing seat 331 and a joint 332. The fixing seat 331 is provided with a channel 3311. The channel 3311 has a liquid inlet end and a liquid outlet end. The liquid outlet end is connected to the first branch pipe 51. The joint 332 is provided at the liquid inlet end and can be inserted into the liquid outlet hole to connect the working chamber 323 with the first branch pipe 51.

[0047] When in use, the liquid capsule is continuously and constantly compressed, so that the driving medium in the liquid capsule is continuously and constantly filled into the driving chamber 313 through the first connecting hole 13, so as to push the driving plunger 312 to move away from the first connecting hole 13 at a constant speed, and then drive the working piston 322 to move away from the first driving component 31 at a constant speed, so that the first working medium in the working chamber 323 is continuously and constantly injected into the indwelling needle through the joint 332 via the channel 3311, the first branch pipe 51 and the main pipe 53, thereby realizing continuous and constant liquid supply into the indwelling needle, so that a constant positive pressure liquid flow is maintained in the indwelling needle, blood reflux is prevented, thereby preventing the formation of thrombus in the indwelling needle and causing blockage of the indwelling needle;

[0048] During resetting, the expansion sac draws the driving medium in the driving cavity 313 back into the sac to drive the driving plunger 312 to move toward the first connecting hole 13 , thereby restoring the driving plunger 312 to the initial position.

[0049] Preferably, the first working component 32 is detachably installed in the first installation groove 11, so that the first working component 32 can be replaced in time according to actual use conditions, thereby improving the flexibility and reliability of the auxiliary device.

[0050] Preferably, a sealing film is provided on the liquid outlet, and the sealing film is used to seal the liquid outlet to prevent the first working medium in the working chamber 323 from leaking.

[0051] Preferably, the joint 332 can slide along the axis of the channel 3311; the first connecting component 33 also includes a tightening spring 333, which is arranged in the channel 3311, and one end of the tightening spring 333 is connected to the channel 3311, and the other end is connected to the joint 332, and the tightening spring 333 is used to apply an elastic thrust to the joint 332; when replacing the first working component 32, the first working component 32 is inserted into the first mounting groove 11, and the first working component 32 can push the joint 332 back into the channel 3311, when the joint 332 is When the liquid outlet holes are coaxially aligned, the connector 332 is inserted into the liquid outlet hole under the elastic thrust of the tightening spring 333 and pierces the sealing film, so that the working chamber 323 is automatically connected with the channel 3311, making the replacement of the first working component 32 more convenient and flexible, and reducing the workload of medical staff; in addition, by pushing the connector 332 into the liquid outlet hole through the tightening spring 333, the connection strength between the first working component 32 and the first driving component 31 and the first connecting component 33 can be improved, preventing the first working component 32 from escaping from the first mounting groove 11, thereby improving the reliability of the use of the auxiliary device.

[0052] Preferably, the pulse flow unit 4 includes a second driving component 41, a second working component 42, a second connecting component 43 and a pulser 44. The second driving component 41, the second working component 42 and the second connecting component 43 are connected in sequence. The pulser 44 is installed in the second connecting component 43. The second driving component 41 is also connected to the second connecting hole 14. The second connecting component 43 is also connected to the second branch pipe 52. The second working component 42 contains a second working medium. When in use, the liquid capsule is continuously and constantly compressed, so that the driving medium in the liquid capsule passes through the second The connecting hole 14 is continuously and constantly filled with the second driving component 41, and the second driving component 41 drives the second working component 42 to move, and the working medium in the second working component 42 is injected into the pulser 44 through the second connecting component 43. The pulser 44 converts the second working medium into a pulse flow, and then injects it into the indwelling needle in the form of a positive pressure pulse flow through the second branch pipe 52 and the main pipe 53, so as to realize pulsed liquid feeding into the indwelling needle, and regularly flush the indwelling needle to prevent blood from adhering to the catheter tip of the indwelling needle, thereby preventing the formation of a thrombus at the catheter tip of the indwelling needle and avoiding blockage of the indwelling needle.

[0053] Preferably, the structure of the second driving assembly 41 is the same as that of the first driving assembly 31 ; the structure of the second working assembly 42 is the same as that of the first working assembly 32 ; and the structure of the second connecting assembly 43 is the same as that of the first connecting assembly 33 .

[0054] Preferably, the pulser 44 is arranged in the channel 3311 on the fixed seat 331 in the second connecting component 43. The pulser 44 controls the pulsed flow of the second working medium into the channel 3311 by controlling the on-off of the channel 3311, and then the second branch pipe 52 and the main pipe 53 inject the second working medium pulse into the indwelling needle, and regularly flush the indwelling needle to prevent blood from adhering to the tip of the catheter of the indwelling needle, thereby preventing the formation of a thrombus at the tip of the catheter of the indwelling needle and causing blockage of the indwelling needle.

[0055] Preferably, if Figure 8 , Fig. 9 and Fig.10As shown, the pulser 44 includes a mounting seat 441, a pulse piston 442, an expansion membrane 443, a return spring 444, a locking pin plug 445 and a locking spring 446. The mounting seat 441 is fixedly arranged at the liquid inlet end of the channel 3311; the mounting seat 441 is provided with a first mounting cavity 4411, a second mounting cavity 4412 and a third connecting hole 4413, the first mounting cavity 4411 is opposite to the liquid inlet end of the channel 3311 and is connected; the third connecting hole 4413 connects the first mounting cavity 4411 and the liquid outlet end of the channel 3311; the pulse piston 442 is provided with a buffer cavity 4421 and a locking hole 4422, one end of the buffer cavity 4421 is an open end, and the expansion membrane 443 is arranged on the open end; the pulse piston 442 and the return spring 444 are both arranged in the first mounting cavity 4411, and the pulse piston 442 can move along the first mounting cavity 44 11, and the pulse piston 442 slides along the axis of the first installation cavity 4411 to realize the opening and closing control of the third connecting hole 4413, thereby realizing the on-off of the control channel 3311, and further realizing the control of the pulse flow of the second working medium; one end of the reset spring 444 is connected to the pulse piston 442, and the other end is connected to the first installation cavity 4411, and the reset spring 444 is used to apply an elastic thrust to the pulse piston 442; the locking pin plug 445 and the locking spring 446 are both arranged in the second installation cavity 4412, and the locking pin plug 445 can slide along the axis of the second installation cavity 4412 and can be inserted into the locking hole 4422, and is used to lock the pulse piston 442; one end of the locking spring 446 is connected to the locking pin plug 445, and the other end is connected to the second installation cavity 4412, and the locking spring 446 is used to apply an elastic thrust to the locking pin plug 445;

[0056] The working principle of the pulser 44 is:

[0057] The second working medium in the second working assembly 42 first applies a force to the expansion membrane 443, and the expansion membrane 443 expands into the buffer chamber 4421. At this time, the pulse piston 442 is locked because the lock pin plug 445 is inserted into the locking hole 4422, so that the position of the pulse piston 442 remains unchanged; at this time, the pulse piston 442 shields the third connecting hole 4413, even if the third connecting hole 4413 is closed, the channel 3311 is blocked, and the passage between the working chamber 323 and the second branch pipe 52 is further blocked, so that the working medium in the second working assembly 42 cannot be injected into the second branch pipe 52 through the third connecting hole 4413 and the channel 3311;

[0058] As the second working medium in the second working assembly 42 continues to exert a force on the expansion membrane 443, the expansion membrane 443 continues to expand into the buffer chamber 4421. The air in the buffer chamber 4421 is squeezed by the expansion membrane 443 and its pressure increases, so that the force acting on the lock pin plug 445 is greater than the elastic thrust of the locking spring 446, and the lock pin plug 445 is withdrawn from the locking hole 4422, thereby releasing the lock on the pulse piston 442. At this time, the pressure applied to the pulse piston 442 by the second working medium in the second working assembly 42 is greater than the elastic thrust applied to the pulse piston 442 by the return spring 444, and the pulse piston 442 after the lock is released. The plug 442 instantly moves toward the direction close to the second branch pipe 52, thereby exposing the third connecting hole 4413. Even if the third connecting hole 4413 is opened, the connecting channel 3311 is connected, and then the passage between the working chamber 323 and the second branch pipe 52 is connected, so that the working medium in the second working component 42 is instantly injected into the second branch pipe 52 through the third connecting hole 4413 and the channel 3311, so as to control the pulse flow of the second working medium, and realize the pulse liquid feeding into the indwelling needle through the main pipe 53, so as to flush the indwelling needle and prevent blood from adhering to the catheter tip of the indwelling needle, thereby preventing the formation of thrombus at the catheter tip of the indwelling needle and causing blockage of the indwelling needle;

[0059] As the second pressure at the liquid inlet and outlet ends of the channel 3311 is balanced, the expansion membrane 443 returns to its initial state; the return spring 444 pushes the pulse piston 442 to move away from the second branch pipe 52, so that the pulse piston 442 returns to its initial position; the locking pin plug 445 is coaxially aligned with the locking hole 4422, and the locking spring 446 pushes the locking pin plug 445 to insert into the locking hole 4422 to lock the pulse piston 442, thereby keeping the pulse piston 442 in its initial position; at this time, the pulse piston 442 again covers the third connecting hole 4413, even if the third connecting hole 4413 is closed again, the channel 3311 is blocked again, and then the passage between the working chamber 323 and the second branch pipe 52 is blocked again, so that the working medium in the second working component 42 cannot be injected into the second branch pipe 52 through the third connecting hole 4413 and the channel 3311, completing a pulse liquid feeding.

[0060] Preferably, the driving medium is water; the first working medium and the second working medium are both physiological saline.

[0061] Preferably, the seat body 1 is also provided with a first clamp block and a second clamp block, both of which can slide on the seat body 1, and the seat body 1 can be fixed on the wrist of different patients by adjusting the distance between the first clamp block and the second clamp block, thereby improving the adaptability of the auxiliary device and expanding the scope of use of the auxiliary device.

[0062] Preferably, the seat body 1 is also provided with a strap, which can further fix the auxiliary device on the patient's body to prevent the auxiliary device from moving, avoid adverse effects on the sealing of the indwelling needle, and further improve the sealing effect of the indwelling needle.

[0063] Example 2

[0064] Embodiment 2 is a further improvement on the basis of embodiment 1. Fig.11 As shown, the pulse flow unit 4 also includes a pulse regulating mechanism 45, which is arranged on the seat body 1 and connected to the pulser 44, and is used to adjust the pulser 44 to make the second working medium in the second working component 42 generate a pulse flow frequency, so that the pulse flow unit 4 can adjust the pulse flow frequency according to actual conditions, thereby realizing the frequency of pulse fluid delivery to the indwelling needle without replacing the auxiliary device, thereby improving the applicability, flexibility and reliability of the use of the auxiliary device.

[0065] Preferably, if Fig.12 As shown, the pulse adjustment mechanism 45 includes a control cylinder 451, a control plunger 452 and a liquid storage cylinder 453, wherein the liquid storage cylinder 453 contains a control medium; one end of the control cylinder 451 is connected to the second mounting cavity 4412, and the other end is connected to the liquid storage cylinder 453, and the control medium in the liquid storage cylinder 453 can be filled into the control cylinder 451; the control plunger 452 is arranged in the control cylinder 451 and can slide along the axis of the control cylinder 451; one end of the control plunger 452 is fixedly connected to the locking spring 446, and the other end is in contact with the control medium; when in use, the control medium in the liquid storage cylinder 453 is filled into or extracted from the control cylinder 451 to adjust the position of the control plunger 452 in the control cylinder 451, thereby adjusting the pre-set position of the locking spring 446 The amount of compression can be adjusted, thereby adjusting the elastic thrust applied by the locking spring 446 to the locking pin plug 445 (i.e., adjusting the tightening force of the locking spring 446 on the locking pin plug 445), and then adjusting the time for the locking pin plug 445 to withdraw from the locking hole 4422 (i.e., adjusting the time for releasing the lock of the pulse piston 442), so as to adjust the frequency control of the opening and closing of the third connecting hole 4413 controlled by the pulse piston 442, thereby adjusting the frequency of the on-off control channel 3311, and then adjusting the frequency of the pulse flow of the second working medium, so that the pulse flow unit 4 can adjust the pulse flow frequency according to the actual situation, and realize the frequency of pulse fluid delivery to the indwelling needle can be adjusted without replacing the auxiliary device, thereby improving the applicability, flexibility and reliability of the use of the auxiliary device.

[0066] Preferably, if Fig.13As shown, the pulse adjustment mechanism 45 also includes a control piston 454 and a regulating screw 455. The control piston 454 is arranged in the liquid storage cylinder 453 and can slide along the axis of the liquid storage cylinder 453; one end of the control piston 454 is connected to the regulating screw 455, and the other end is in contact with the regulating medium; the regulating screw 455 is arranged in the liquid storage cylinder 453 and is threadedly connected to the liquid storage cylinder 453; when in use, the position of the control piston 454 in the liquid storage cylinder 453 is adjusted by screwing the regulating screw 455, so that the regulating medium in the liquid storage cylinder 453 is filled into or extracted from the regulating cylinder 451, thereby realizing the rapid adjustment of the position of the regulating plunger 452 in the regulating cylinder 451, and then realizing the rapid adjustment of the pre-compression amount of the locking spring 446, which is convenient for operation.

[0067] Preferably, the pulse adjustment mechanism 45 further includes a control knob 456, and the control knob 456 is fixedly connected to the control screw 455, and the control screw 455 can be conveniently screwed by rotating the control knob 456, so as to facilitate adjustment.

[0068] Preferably, the pulse adjustment mechanism 45 also includes a display mechanism (not shown in the figure), and the display mechanism includes a scale and an indicator needle. The scale is set on the regulating knob 456, and the indicator needle is set on the liquid storage cylinder 453. Through the cooperation of the indicator needle and the scale, the specific position of the control piston 454 in the liquid storage cylinder 453 can be clearly and intuitively displayed, and then the pre-compression amount of the locking spring 446 can be displayed.

[0069] Preferably, the regulating working fluid is water.

[0070] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. An intravenous infusion auxiliary device, used to connect with an indwelling needle and seal the indwelling needle to prevent embolism of the indwelling needle, characterized in that: The invention comprises a seat body (1), a driving unit (2), a constant flow unit (3), a pulse flow unit (4) and a connecting tube (5); the constant flow unit (3) and the pulse flow unit (4) are both connected to one end of the connecting tube (5), and the other end of the connecting tube (5) is connected to the indwelling needle; the constant flow unit (3) and the pulse flow unit (4) are both connected to the driving unit (2), and the driving unit (2) is used to provide a driving force for the coordinated action of the constant flow unit (3) and the pulse flow unit (4); the constant flow unit (3) contains a first working medium, which is used to continuously and constantly supply liquid to the indwelling needle so that a constant positive pressure liquid flows in the indwelling needle; the pulse flow unit (4) contains a second working medium, which is used to pulse supply liquid to the indwelling needle so as to regularly flush the indwelling needle; The pulse flow unit (4) comprises a pulser (44); The pulser (44) comprises a mounting seat (441), a pulse piston (442), an expansion membrane (443), a return spring (444), a locking pin plug (445) and a locking spring (446); the mounting seat (441) is provided with a first mounting cavity (4411), a second mounting cavity (4412) and a third connecting hole (4413); the pulse piston (442) is provided with a buffer cavity (4421) and a locking hole (4422); one end of the buffer cavity (4421) is an open end, and the expansion membrane (443) is arranged on the open end; the pulse piston (442) and the return spring (444) are both arranged in the first mounting cavity (4411); the pulse piston (442) can slide along the axis of the first mounting cavity (4411); and the pulse piston (442) can slide along the axis of the first mounting cavity (4411). 411) to realize the opening and closing control of the third connecting hole (4413); one end of the reset spring (444) is connected to the pulse piston (442), and the other end is connected to the first mounting cavity (4411), and the reset spring (444) is used to apply an elastic thrust to the pulse piston (442); the locking pin plug (445) and the locking spring (446) are both arranged in the second mounting cavity (4412), and the locking pin plug (445) can slide along the axis of the second mounting cavity (4412) and can be inserted into the locking hole (4422) to lock the pulse piston (442); one end of the locking spring (446) is connected to the locking pin plug (445), and the other end is connected to the second mounting cavity (4412), and the locking spring (446) is used to apply an elastic thrust to the locking pin plug (445).

2. The intravenous infusion auxiliary device according to claim 1, characterized in that: The constant flow unit (3) comprises a first driving component (31), a first working component (32) and a first connecting component (33), wherein the first driving component (31), the first working component (32) and the first connecting component (33) are connected in sequence; the first driving component (31) is also connected to the driving unit (2), and the first connecting component (33) is also connected to the connecting pipe (5).

3. The intravenous infusion auxiliary device according to claim 2, characterized in that: The pulse flow unit (4) further comprises a second driving component (41), a second working component (42) and a second connecting component (43), wherein the second driving component (41), the second working component (42) and the second connecting component (43) are connected in sequence; the pulser (44) is installed in the second connecting component (43); the second driving component (41) is also connected to the driving unit (2), and the second connecting component (43) is also connected to the connecting pipe (5).

4. The intravenous infusion auxiliary device according to claim 3, characterized in that: The first working component (32) contains a first working medium, and the second working component (42) contains a second working medium.

5. The intravenous infusion auxiliary device according to claim 4, characterized in that: The first driving assembly (31) comprises a driving sleeve (311) and a driving plunger (312); the driving plunger (312) is disposed in the driving sleeve (311) and is capable of sliding along the axis of the driving sleeve (311); the driving sleeve (311) and the driving plunger (312) together form a driving cavity (313).

6. The intravenous infusion auxiliary device according to claim 5, characterized in that: The first working assembly (32) comprises a working sleeve (321) and a working piston (322), wherein the working piston (322) is arranged in the working sleeve (321) and can slide along the axis of the working sleeve (321); the working sleeve (321) and the working piston (322) together form a working chamber (323), wherein the working chamber (323) contains a first working medium.

7. The intravenous infusion auxiliary device according to claim 6, characterized in that: The first connecting component (33) comprises a fixing seat (331) and a joint (332), the fixing seat (331) is provided with a channel (3311), and the joint (332) is slidably arranged in the channel (3311) and can be inserted into the working cavity (323).

8. The intravenous infusion auxiliary device according to claim 7, characterized in that: The seat body (1) is provided with a first communicating hole (13), a second communicating hole (14) and a containing cavity (15).

9. The intravenous infusion auxiliary device according to claim 8, characterized in that: The drive unit (2) comprises a motor (21), a lead screw (22), a drive plate (23) and a liquid capsule, wherein the lead screw (22) is mounted in the accommodating chamber (15) and is rotatably connected to the accommodating chamber (15); the motor (21) is connected to the lead screw (22); the liquid capsule is arranged in the accommodating chamber (15), and the liquid capsule stores a driving medium; the liquid capsule is connected to the drive chambers (313) in the first drive assembly (31) and the second drive assembly (41) through a first connecting hole (13) and a second connecting hole (14), respectively; the drive plate (23) is arranged in the accommodating chamber (15), and is inserted into the lead screw (22), and is capable of sliding along the axis of the lead screw (22); the drive plate (23) is also fixedly connected to the liquid capsule.

10. The intravenous infusion auxiliary device according to claim 9, characterized in that: The connecting tube (5) comprises a first branch tube (51), a second branch tube (52) and a main tube (53); one end of the first branch tube (51) is connected to the first connecting component (33), and one end of the second branch tube (52) is connected to the second connecting component (43); the other ends of the first branch tube (51) and the second branch tube (52) are both connected to one end of the main tube (53); and the other end of the main tube (53) is connected to an indwelling needle.

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