Remaining needle for transcranial Doppler ultrasonic imaging

Abstract

The invention relates to an indwelling needle for transcranial Doppler ultrasonic imaging, belongs to the technical field of medical instruments, and solves the problems that a valve of a three-way infusion connector in the prior art is rotary, series flow is caused due to loose sealing of the valve, and the valve cannot be tightly sealed due to the fact that the valve cannot be easily rotated to an accurate sealing position. The device comprises an injection unit, a mixing unit, a control valve unit, a first mixing bin unit and a second mixing bin unit, wherein the control valve unit is used for switching preparation and conveying paths of a bubble developer; and the first mixing bin unit and the second mixing bin unit are respectively used for co-acting with the first injector to prepare and store a bubble developer. Compared with the prior art that a user holds a first injector and a second injector with two hands respectively, and the two injectors push each other to mix pumped-back blood with normal saline and air to prepare the bubble developer, the bubble developer preparation device only needs one hand, and preparation operation of the bubble developer is facilitated.

Description

[0001] This application is a divisional application with an application date of November 21, 2024, application number 202411673748.8, and invention name “A kind of indwelling needle for transcranial Doppler ultrasound imaging”. Technical Field

[0002] The present invention relates to the technical field of medical devices, and in particular to an indwelling needle for transcranial Doppler ultrasound imaging. Background Art

[0003] With the accelerated pace of life and changes in lifestyle, the incidence of cerebrovascular disease has been increasing year by year, and the incidence is tending to be younger. To avoid the impact of cerebrovascular disease on health, how can we achieve early diagnosis and early treatment? Transcranial Doppler ultrasound is one of the indispensable and important detection methods.

[0004] Transcranial Doppler ultrasound is an examination method that uses the ultrasonic Doppler effect to detect the hemodynamics and blood flow physiological parameters of the main intracranial arteries, thereby assisting in diagnosing whether the intracranial arteries are stenotic, occluded or spasmodic, as well as the location and extent of the lesions. This is good news for patients with unexplained stroke, migraine and those requiring cerebrovascular monitoring.

[0005] During the bubble test, a special transcranial Doppler ultrasound (TCD) examination, dual-channel multi-depth TCD technology is used. The head frame is fixed, and the bilateral middle cerebral arteries are detected (the vertebral arteries can be detected through the occipital window or paraoccipital window in patients with poor temporal window ultrasound). The right cubital vein is punctured, and while breathing calmly and performing the standard Valsalva maneuver, activated saline is rapidly injected to monitor the embolic signal. Finally, the embolic signal is quantified and graded, and a report is issued. Its purpose is to check whether there is a right-to-left shunt in the heart, to help diagnose conditions such as patent foramen ovale, and can serve as a basis for screening and diagnosis of causes such as unexplained migraine and stroke.

[0006] In conventional push injection activation of saline, a catheter is usually implanted in the human body, a three-way infusion connector is installed on the catheter, and then syringes are connected to the two ends of the three-way infusion connector respectively. The syringe at one end is filled with saline, and the syringe at the other end is filled with air. The syringe at the end filled with saline is first connected to the catheter, and the blood in the catheter is withdrawn and mixed with the saline in the syringe. Then, one end of the catheter is closed and the syringes at both ends are connected. The syringes at both ends are pushed against each other to mix the withdrawn blood with the saline and air to prepare a bubble developer. The bubble developer is then pushed into the human body, and the image is observed by an instrument to complete the test.

[0007] The valve of the three-way infusion connector used in the existing test is a rotary type, and the on and off of different ends are controlled by rotating the valve. This three-way valve only relies on friction to achieve the limit after the valve is rotated, which may easily lead to the valve not being tightly closed and causing cross-flow. In addition, it is easy to fail to rotate to the accurate closing position through rotation control, resulting in the valve not being tightly closed. In addition, the connection between the needle body and the three-way infusion connector also increases the steps of the test.

[0008] To this end, we propose an indwelling needle for transcranial Doppler ultrasound imaging. Summary of the Invention

[0009] To address the above-mentioned shortcomings of the prior art, the present invention provides an indwelling needle for transcranial Doppler ultrasound imaging. This invention addresses the problem in the prior art of a three-way infusion connector, where the valve is a rotary valve, the valve is not tightly closed, leading to cross-flow, and the rotary control easily fails to rotate to the accurate closed position, resulting in a loose valve seal.

[0010] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is:

[0011] A catheter for transcranial Doppler ultrasound imaging comprises an injection unit, a mixing unit and a control valve unit. The injection unit is connected to the mixing unit, the control valve unit is arranged in the mixing unit, the mixing unit is used to prepare a bubble developer and inject it into the human body through the injection unit, and the control valve unit is used to switch the preparation and delivery path of the bubble developer.

[0012] Furthermore, the injection unit includes an indwelling needle and a liquid passage tube, the indwelling needle is connected to the mixing unit through the liquid passage tube, and the bubble developer prepared by the mixing unit is transported to the indwelling needle through the liquid passage tube and then injected into the human body.

[0013] Furthermore, the mixing unit includes a shell, a first interface and a second interface, the first interface and the second interface are relatively arranged on both sides of the shell, one end of the shell is connected to the liquid tube, and this end is the liquid end. The shell includes a hollow part, the first interface is used to connect the first syringe, and the second interface is used to connect the second syringe. The liquids in the first syringe and the second syringe can be exchanged through the mixing unit to prepare the bubble developer.

[0014] Furthermore, the control valve unit includes a valve body and a first liquid transfer hole. The valve body is arranged in the hollow part of the shell, and the first liquid transfer hole is arranged on the valve body. The first liquid transfer hole is used to connect the first interface and the second interface so that the bubble developer can flow between the first interface and the second interface.

[0015] Furthermore, one end of the valve body close to the liquid pipe is a liquid guiding section, and the liquid guiding section is a wedge-shaped liquid guiding section.

[0016] Furthermore, the surface of the liquid-conducting section is a concave arc surface.

[0017] Further, the mixing unit further comprises a limiting protrusion, which is arranged on the inner wall of the shell.

[0018] Further, the control valve unit further comprises a first limiting groove, a second limiting groove and a third limiting groove, which are arranged in sequence along the axial direction of the valve body and are annularly arranged on the outer wall surface of the valve body; the limiting protrusion can be connected with the first limiting groove, the second limiting groove or the third limiting groove, respectively.

[0019] Further, the first push-pull unit comprises a force applying plate, a counterforce transverse plate and two counterforce side plates, the force applying plate is connected with the valve body and is a rectangular force applying plate, the two counterforce side plates are arranged at the two ends of the force applying plate in the width direction, and the counterforce transverse plate is arranged at the top end of the counterforce side plate and is parallel to the force applying plate.

[0020] Further, the outer wall of the shell is a square cylindrical outer wall, one end of the counterforce transverse plate can be connected with the outer wall of the shell, so as to prevent the valve body from rotating circumferentially.

[0021] Further, a reinforcing rod is arranged between the counterforce side plate and the counterforce transverse plate, one end of the reinforcing rod is connected with the counterforce side plate, and the other end of the reinforcing rod is connected with the counterforce transverse plate, the reinforcing rod is used for strengthening the connection between the counterforce side plate and the counterforce transverse plate, so as to prevent the counterforce transverse plate from rotating around the end of the counterforce side plate and causing operation failure.

[0022] Further, the mixing unit further comprises a chute, which is arranged on the inner wall of one end of the shell.

[0023] Further, the second push-pull unit comprises a driving member, a connecting rod and a rotating shaft, one end of the connecting rod is connected with the valve body, the other end of the connecting rod is rotationally connected with the rotating shaft, the rotating shaft is fixedly connected with the driving member, the driving member can rotate around the rotating shaft, the end of the rotating shaft is arranged in the chute, and the driving member can slide along the chute.

[0024] Further, the mixing unit further comprises a rack, which is arranged on the inner wall of the shell.

[0025] Further, the driving member is a hand gear, and the driving member comprises driving teeth, which can be connected with the rack.

[0026] A catheter for transcranial Doppler ultrasound imaging comprises an injection unit, a mixing unit, a control valve unit, a first mixing chamber unit and a second mixing chamber unit. The injection unit, the first mixing chamber unit and the second mixing chamber unit are respectively connected to the mixing unit. The control valve unit is arranged in the mixing unit. The mixing unit is used to prepare a bubble developer and input it into the human body through the injection unit. The control valve unit is used to switch the preparation and delivery path of the bubble developer. The first mixing chamber unit and the second mixing chamber unit are respectively used to work together with a first syringe to prepare and store the bubble developer.

[0027] Furthermore, the injection unit includes an indwelling needle and a liquid passage tube. The indwelling needle is connected to the mixing unit through the liquid passage tube. The bubble developer prepared by the mixing unit is transported to the indwelling needle through the liquid passage tube and then injected into the human body.

[0028] Furthermore, the mixing unit includes a shell, a first interface and a second interface, the first interface and the second interface are relatively arranged on both sides of the shell, one end of the shell is connected to the liquid tube, and this end is the liquid end. The shell includes a hollow part, the first interface is used to connect the first syringe, and the second interface is used to connect the second syringe. The liquids in the first syringe and the second syringe can be exchanged through the mixing unit to prepare a bubble developer.

[0029] Furthermore, the control valve unit includes a valve body and a first liquid transfer hole. The valve body is arranged in the hollow part of the shell, and the first liquid transfer hole is arranged on the valve body. The first liquid transfer hole is used to connect the first interface and the second interface so that the bubble developer can flow between the first interface and the second interface.

[0030] Furthermore, one end of the valve body close to the liquid pipe is a liquid guiding section, which is a wedge-shaped liquid guiding section. The liquid guiding section can block the second interface and connect the first interface with the liquid pipe.

[0031] Furthermore, the mixing unit further includes a limiting protrusion, which is arranged on the inner wall of the shell.

[0032] Furthermore, the control valve unit also includes a first limiting groove, a second limiting groove and a third limiting groove. The first limiting groove, the second limiting groove and the third limiting groove are arranged in sequence along the axial direction of the valve body, and are all annularly opened on the outer wall surface of the valve body; the limiting protrusion can be connected to the first limiting groove, the second limiting groove or the third limiting groove respectively.

[0033] Furthermore, the first mixing chamber unit includes a first cylinder, a first piston and a first spring, one end of the first cylinder is connected to the second interface, and the other end of the first cylinder is a free end. The first piston and the first spring are both arranged in the hollow part of the first cylinder, one end of the first spring is connected to the first piston, and the other end of the first spring is connected to the free end of the first cylinder. The first spring is used to push the first piston toward the second interface, and the first piston is used to push the bubble developer in the hollow part of the first cylinder out of the first cylinder, thereby returning the bubble developer to the first syringe.

[0034] Furthermore, the first mixing chamber unit also includes a first vent hole, which is arranged on the free end of the first cylinder. The first vent hole is used to balance the air pressure in the first cylinder when the bubble developer is introduced into and out of the first cylinder.

[0035] Furthermore, the mixing unit further includes a third interface, which is provided on the housing.

[0036] Furthermore, it also includes a second mixing chamber unit, the structure of which is the same as that of the first mixing chamber unit; the second mixing chamber unit includes a second cylinder, a second piston, a second spring and a second vent, and the second cylinder is connected to the third interface; the second mixing chamber unit is used to work together with the first syringe to prepare and store bubble developer.

[0037] Furthermore, the control valve unit also includes a second liquid transfer hole, which is arranged on the valve body. The second liquid transfer hole is used to connect the first interface and the third interface, so that the bubble developer can flow between the first interface and the third interface; after the user uses the first syringe and the first mixing chamber unit to prepare the bubble developer, the first portion of the bubble developer is stored in the first mixing chamber unit, and the second portion of the bubble developer is stored in the second mixing chamber unit for standby use, so that the bubble developer for two uses can be prepared at one time, which greatly saves preparation time.

[0038] Furthermore, the control valve unit also includes a fourth limiting groove, which is arranged on the valve body, and the shape of the fourth limiting groove is the same as the first limiting groove; the fourth limiting groove and the limiting protrusion are engaged, and the two ends of the second liquid transfer hole are respectively connected to the first interface and the third interface.

[0039] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0040] (1) The indwelling needle of the present invention fixedly connects the mixing unit to the injection unit, thus avoiding the on-site connection step of the mixing unit and the injection unit during surgery; the valve body is slidably arranged in the mixing unit, and the closure of each end of the mixing unit is achieved by sliding the valve body, and the position limit of each level of closure is achieved by controlling the valve unit. Compared with the existing rotary three-way infusion connector, the position limit is achieved by controlling the valve unit, and the perception is clearer, and the valve closure is more stable, and cross-flow will not occur;

[0041] (2) By providing the limiting groove and the limiting protrusion in cooperation with each other in the present invention, each limiting groove and limiting protrusion cooperate to form a closed state, and the control valve unit can play a sealing role while playing a limiting role;

[0042] (3) The hollow portion of the shell of the present invention is a cylindrical hollow portion, and the outer wall of the shell is a square cylindrical outer wall. One end of the reaction force horizontal plate can be connected to the outer wall of the shell, thereby preventing the valve body from rotating circumferentially, ensuring that the liquid guide section can block the second interface, and avoiding the deflection of the liquid guide section, resulting in the hollow portion not being tightly closed and cross-flow; setting the surface of the liquid guide section to an inner concave arc surface can make the liquid flow smoother;

[0043] (4) The driving teeth of the present invention increase the friction of the driving member, and the driving teeth mesh with the rack to prevent the user from slipping when pushing or pulling the driving member; the user holds the housing with one hand and then uses the thumb of the same hand to turn the driving member, thereby pushing and pulling the valve body with one hand, further facilitating the user to operate the indwelling needle with one hand;

[0044] (5) The present invention utilizes a first mixing chamber unit instead of a second syringe. The user only needs to use one hand to hold the first syringe and push the piston of the first syringe to prepare the bubble developer. This is different from the prior art in which the user holds the first syringe with one hand and the second syringe with the other hand, and the two syringes push each other to mix the withdrawn blood with the saline solution and air. The preparation of the bubble developer requires both hands. The present invention only requires one hand, which further facilitates the preparation of the bubble developer.

[0045] (6) The fourth limiting groove and the limiting protrusion of the present invention are engaged, and the two ends of the second liquid transfer hole are respectively connected to the first interface and the third interface, so that the bubble developer can be transferred between the first syringe and the second mixing chamber unit. The second mixing chamber unit can participate in the preparation of the bubble developer and can also be used to store the bubble developer; the user can use the first syringe, and after working together with the first mixing chamber unit to prepare the bubble developer, store the first portion of the bubble developer in the first syringe, store the second portion of the bubble developer in the first mixing chamber unit, and then store the third portion of the bubble developer in the second mixing chamber unit for standby use, so that the bubble developer for three uses can be prepared at one time, saving preparation time.

[0046] In the present invention, the above-mentioned technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of the present invention will be described in the following content, and some advantages will become apparent from the description or be learned through practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained as particularly pointed out in the text and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 Schematic diagram of the overall structure of the indwelling needle;

[0048] Figure 2 Schematic diagram of the internal structure of the mixing unit, the control valve unit and the first push-pull unit of Example 1;

[0049] Figure 3 Schematic diagram of the side structure of the mixing unit and the first push-pull unit of Example 1;

[0050] Figure 4 It is a schematic diagram of the overall structure of the valve body;

[0051] Figure 5 This is a schematic structural diagram of the mixing unit and the second push-pull unit of Example 2;

[0052] Figure 6 Schematic diagram of the internal structure of the mixing unit, the control valve unit and the second push-pull unit of Example 2;

[0053] Figure 7 Schematic diagram of the front structure of the mixing unit and the control valve unit of Example 3;

[0054] Figure 8 Schematic diagram of the internal structure of the mixing unit and the control valve unit of Example 3.

[0055] Reference numerals:

[0056] 1-injection unit; 2-mixing unit; 3-control valve unit; 4-first push-pull unit; 5-second push-pull unit; 6-first mixing chamber unit; 7-second mixing chamber unit; 11-indwelling needle; 12-fluid passage; 21-housing; 22-first interface; 23-second interface; 24-limiting protrusion; 25-slide; 26-rack; 27-third interface; 31-valve body; 32-first liquid transfer hole; 33-first limiting groove; 3 4-second limiting groove; 35-third limiting groove; 36-second liquid transmission hole; 37-fourth limiting groove; 41-force plate; 42-reaction horizontal plate; 43-reaction side plate; 44-reinforcement rod; 51-driving member; 52-connecting rod; 53-rotating shaft; 61-first cylinder; 62-first piston; 63-first spring; 64-first vent; 71-second cylinder; 72-second piston; 73-second spring; 74-second vent. DETAILED DESCRIPTION

[0057] The specific embodiments of the present invention are described below to facilitate understanding of the present invention by those skilled in the art. However, it should be clear that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the appended claims, these changes are obvious, and all inventions and creations utilizing the concepts of the present invention are protected.

[0058] Example 1:

[0059] like Figure 1 As shown, an indwelling needle for transcranial Doppler ultrasound imaging (hereinafter referred to as an indwelling needle) includes an injection unit 1, a mixing unit 2, and a control valve unit 3. The injection unit 1 is connected to the mixing unit 2, and the control valve unit 3 is disposed within the mixing unit 2. The mixing unit 2 is used to prepare a bubble contrast agent and deliver it to the human body through the injection unit 1. The control valve unit 3 is used to switch the preparation and delivery path of the bubble contrast agent.

[0060] Preferably, the injection unit 1 includes an indwelling needle body 11 and a liquid passage 12. The indwelling needle body 11 is connected to the mixing unit 2 through the liquid passage 12. The bubble developer prepared by the mixing unit 2 is transported to the indwelling needle body 11 through the liquid passage 12 and then injected into the human body.

[0061] Preferably, Figure 2As shown in the drawings, the mixing unit 2 comprises a housing 21, a first interface 22 and a second interface 23, the first interface 22 and the second interface 23 are oppositely arranged on two sides of the housing 21, one end of the housing 21 is connected with the liquid passage pipe 12, the end is a liquid passage end, the housing 21 comprises a hollow portion, the control valve unit 3 is arranged in the hollow portion, the first interface 22 is used for connecting a first syringe (not shown in the drawings), the second interface 23 is used for connecting a second syringe (not shown in the drawings), the liquid and the gas of the first syringe and the second syringe can be exchanged through the mixing unit 2, so as to prepare the bubble developing agent.

[0062] Preferably, the control valve unit 3 comprises a valve body 31 and a first liquid transmission hole 32, the valve body 31 is arranged in the hollow portion of the housing 21, the first liquid transmission hole 32 is arranged on the valve body 31, the valve body 31 is used for closing the hollow portion and adjusting the liquid flow direction in the hollow portion, and the first liquid transmission hole 32 is used for connecting the first interface 22 and the second interface 23, so that the bubble developing agent can flow between the first interface 22 and the second interface 23.

[0063] Preferably, one end of the valve body 31 close to the liquid passage pipe 12 is a liquid guide section, the liquid guide section is a wedge-shaped liquid guide section, the liquid guide section can block the second interface 23 and can connect the first interface 22 with the liquid passage pipe 12. Preferably, the surface of the liquid guide section is a concave arc surface, so that the liquid transportation is more smooth, and the outer diameter of the valve body 31 is the same as the inner diameter of the housing 21, so that the valve body 31 can effectively block the housing 21.

[0064] Preferably, as shown in the drawings, Figure 2 and Figure 4 The mixing unit 2 further comprises a limiting protrusion 24, the limiting protrusion 24 is arranged on the inner wall of the housing 21. The control valve unit 3 further comprises a first limiting groove 33, a second limiting groove 34 and a third limiting groove 35, the first limiting groove 33, the second limiting groove 34 and the third limiting groove 35 are sequentially arranged along the axial direction of the valve body 31 and are annularly arranged on the outer wall surface of the valve body 31. The limiting protrusion 24 is used for preventing the relative displacement between the valve body 31 and the housing 21, and ensuring the accurate position of the valve body 31 in the housing 21.

[0065] Preferably, when the first limiting groove 33 and the limiting protrusion 24 are engaged, the liquid passage end, the first interface 22 and the second interface 23 are all in a closed state; when the second limiting groove 34 and the limiting protrusion 24 are engaged, the liquid passage end is in a closed state, and the first interface 22 and the second interface 23 are in a communication state; when the third limiting groove 35 and the limiting protrusion 24 are engaged, the first interface 22 and the liquid passage end are in a communication state, and the second interface 23 is in a closed state. When the limiting protrusion 24 is engaged with the first limiting groove 33, the second limiting groove 34 or the third limiting groove 35 respectively, the user can clearly perceive the paragraph feeling, understand whether the connection of each limiting groove and the limiting protrusion 24 is established, and at the same time, can clearly know the relative position relationship between the valve body 31 and the shell 21, facilitating the operation of the surgery.

[0066] Preferably, as shown in Figure 2 and Figure 3 In order to facilitate the push-pull of the control valve unit 3, the indwelling needle of the embodiment further comprises a first push-pull unit 4, the first push-pull unit 4 comprises a force plate 41, a counterforce transverse plate 42 and a counterforce side plate 43, the force plate 41 is connected with the valve body 31, the force plate 41 is a rectangular force plate, the counterforce side plate 43 is two and is respectively arranged at both ends of the width direction of the force plate 41, and the counterforce transverse plate 42 is arranged at the top end of the counterforce side plate 43 in parallel with the force plate 41. The user can pull the force plate 41 with two fingers, so as to pull the valve body 31 out of the shell 21, and the user can also push the counterforce transverse plate 42 with one finger, so as to push the valve body 31 into the shell 21, greatly facilitating the operation of the user.

[0067] Preferably, the valve body 31 is in a cylindrical shape, the hollow part of the shell 21 is a cylindrical hollow part, the outer wall of the shell 21 is in a square cylindrical shape, one end of the counterforce transverse plate 42 can be connected with the outer wall of the shell 21, so as to prevent the valve body 31 from rotating in the circumferential direction and ensure that the liquid guide section can block the second interface 23.

[0068] Preferably, a reinforcing rod 44 is further arranged between the counterforce side plate 43 and the counterforce transverse plate 42, one end of the reinforcing rod 44 is connected with the counterforce side plate 43, and the other end of the reinforcing rod 44 is connected with the counterforce transverse plate 42, the reinforcing rod 44 is used for strengthening the connection between the counterforce side plate 43 and the counterforce transverse plate 42, preventing the counterforce transverse plate 42 from rotating around the end of the counterforce side plate 43 and causing operation failure.

[0069] The initial state of the mixing unit 2 is that the first limiting groove 33 and the limiting protrusion 24 are engaged, and the liquid-passing end, the first interface 22 and the second interface 23 are all in a closed state. When in use, it is necessary to first pull the valve body 31 so that the third limiting groove 35 and the limiting protrusion 24 are engaged, the first interface 22 and the liquid-passing end are in a connected state, and the second interface 23 is in a closed state. The patient's blood is extracted through the first syringe connected to the first interface 22. At the same time, the first syringe is filled with physiological saline, and the extracted blood and physiological saline are mixed to form a mixed liquid. After the blood is extracted, the valve body 31 is pressed down so that the third limiting groove 35 and the limiting protrusion 24 are engaged. When the two limiting grooves 34 and the limiting protrusion 24 are engaged, the liquid-passing end is in a closed state, the first interface 22 and the second interface 23, at this time, the first syringe and the second syringe are pushed against each other to fully mix the mixed liquid, and after the mixed liquid is fully mixed, a bubble developer is prepared, and the bubble developer is injected into the first syringe, and then the valve body 31 is pulled up to engage the third limiting groove 35 and the limiting protrusion 24, the first interface 22 and the liquid-passing end are in a connected state, and the second interface 23 is in a closed state, and the bubble developer is injected into the patient's body through the liquid-passing end and the injection unit 1, and the image is observed at the same time to achieve the test.

[0070] The closure of the mixing unit 2 is achieved by sliding the valve body 31 in the mixing unit 2, and the closure of each end of the mixing unit 2 is achieved by sliding the valve body 31, and the position limitation of each level of closure is achieved by controlling the valve unit 3. Compared with the existing rotary three-way infusion connector, the position limitation is achieved by controlling the valve unit 3, and the perception is clearer, and the valve closure is more stable, and cross-flow will not occur. By setting three limit grooves and cooperating with a limit protrusion 24, each limit groove and limit protrusion 24 correspond to a closed state, and the control valve unit 3 can play a sealing role while playing a limiting role. By setting a first push-pull unit 4 and setting a force structure on the top of the valve body 31, it is easier to push and pull the valve body 31, and the reaction force is horizontal. The plate 42 serves as the fulcrum for the palm of the hand of the person, and the fingers and middle fingers hook the force-applying structure to facilitate the lifting of the valve body 31; the hollow part of the shell 21 is a cylindrical hollow part, and the outer wall of the shell 21 is a square cylindrical outer wall. One end of the reaction cross plate 42 can be connected to the outer wall of the shell 21, thereby preventing the valve body 31 from rotating circumferentially, ensuring that the liquid guiding section can block the second interface 23, and avoiding the deflection of the liquid guiding section and the situation where the hollow part is not tightly closed and cross-flow occurs; the two ends of the force plate 41 are further extended beyond the two ends of the reaction cross plate 42 to facilitate the person to press the valve body 31 through the force plate 41; the reinforcement rod 44 is set to increase the stability between the reaction side plate 43 and the reaction cross plate 42, and avoid the reaction cross plate 42 from rotating around the end of the reaction side plate 43, causing operation failure; the surface of the liquid guiding section is set to an inward concave arc surface to make the liquid flow smoother.

[0071] Example 2:

[0072] In order to facilitate the user to operate the indwelling needle with one hand, Figure 5 As shown, this embodiment replaces the first push-pull unit 4 with the second push-pull unit 5, and improves the mixing unit 2 of Example 1. The user holds the mixing unit 2 with one hand and can push and pull the valve body 31 of the control valve unit 3 with one hand. The operation is simple and quick.

[0073] Preferably, Figure 6 As shown, compared with Example 1, the housing 21 is lengthened, and the mixing unit 2 is newly provided with a chute 25, which is disposed on the inner wall of one end of the housing 21. The second push-pull unit 5 includes a driving member 51, a connecting rod 52, and a rotating shaft 53. One end of the connecting rod 52 is connected to the valve body 31, and the other end of the connecting rod 52 is rotatably connected to the rotating shaft 53. The rotating shaft 53 is fixedly connected to the driving member 51, and the driving member 51 can rotate around the rotating shaft 53. The end of the rotating shaft 53 is disposed in the chute 25, and the driving member 51 can slide along the chute 25. The user can hold the housing 21 with one hand and then use the thumb of the same hand to push and pull the driving member 51, thereby performing a push-pull operation on the valve body 31 with one hand, making it convenient for the user to operate the indwelling needle with one hand.

[0074] Preferably, the mixing unit 2 further includes a rack 26 disposed on the inner wall of the housing 21. The driving member 51 is a hand gear including drive teeth that are capable of coupling with the rack 26. The drive teeth increase friction on the driving member 51, and the meshing of the drive teeth with the rack 26 prevents slipping when the user pushes or pulls the driving member 51. By holding the housing 21 with one hand and then using the thumb of the same hand to rotate the driving member 51, the user can single-handedly push or pull the valve body 31, further facilitating single-handed operation of the indwelling needle.

[0075] Example 3:

[0076] like Figure 7 As shown, this embodiment further improves the structures of the mixing unit 2 and the control valve unit 3 of embodiment 1 or 2, so that the indwelling needle of this embodiment can be operated with one hand.

[0077] In the prior art, the user holds the first syringe in one hand and the second syringe in the other hand, and the two syringes push each other to mix the withdrawn blood with the physiological saline and air, and the preparation of the bubble developer requires both hands. Figure 7 As shown, the indwelling needle of this embodiment further includes a first mixing chamber unit 6. The first mixing chamber unit 6 is used to replace the second syringe and work together with the first syringe to prepare the bubble developer.

[0078] Preferably, Figure 8As shown, the first mixing chamber unit 6 includes a first cylinder 61, a first piston 62 and a first spring 63. One end of the first cylinder 61 is connected to the second interface 23, and the other end of the first cylinder 61 is a free end. The first piston 62 and the first spring 63 are both arranged in the hollow part of the first cylinder 61. One end of the first spring 63 is connected to the first piston 62, and the other end of the first spring 63 is connected to the free end of the first cylinder 61. The first spring 63 is used to push the first piston 62 toward the second interface 23, and the first piston 62 is used to push the bubble developer in the hollow part of the first cylinder 61 out of the first cylinder 61, thereby returning the bubble developer to the first syringe.

[0079] Preferably, the first mixing chamber unit 6 further includes a first vent hole 64 , which is provided on the free end of the first cylinder 61 . The first vent hole 64 is used to balance the air pressure in the first cylinder 61 when the bubble developer is introduced into and out of the first cylinder 61 .

[0080] In clinical applications, due to individual differences, some cases require the use of multiple bubble contrast agents. If the user operates the indwelling needle in Example 1 or 2, the user needs to prepare the bubble contrast agent multiple times. Figure 7 and Figure 8 As shown, the mixing unit 2 also includes a third interface 27, which is disposed on the housing 21. The indwelling needle of this embodiment also includes a second mixing chamber unit 7, which has the same structure as the first mixing chamber unit 6. The second mixing chamber unit 7 includes a second barrel 71, a second piston 72, a second spring 73, and a second vent 74. The second barrel 71 is connected to the third interface 27. The second mixing chamber unit 7 is used to cooperate with the first syringe to prepare and store the bubble developer.

[0081] Preferably, to control the connection and disconnection between the second mixing chamber unit 7 and the first syringe, the control valve unit 3 further includes a second liquid transfer hole 36. The second liquid transfer hole 36 is provided on the valve body 31 and is used to connect the first interface 22 and the third interface 27, allowing the bubble developer to flow between the first interface 22 and the third interface 27. During use, the user can use the first syringe to work with the first mixing chamber unit 6 to prepare the bubble developer. After that, the user can store the first portion of the bubble developer in the first syringe, the second portion of the bubble developer in the first mixing chamber unit 6, and the third portion of the bubble developer in the second mixing chamber unit 7 for future use. This allows the user to prepare three portions of bubble developer at once, significantly saving preparation time.

[0082] Preferably, to locate the second liquid transfer hole 36 within the valve body 31, the control valve unit 3 also includes a fourth limiting groove 37. This fourth limiting groove 37 is provided on the valve body 31 and has the same shape as the first limiting groove 33. The fourth limiting groove 37 engages with the limiting protrusion 24, and the ends of the second liquid transfer hole 36 are connected to the first interface 22 and the third interface 27, respectively. During use, bubble developer can be transferred between the first syringe and the second mixing chamber unit 7. The second mixing chamber unit 7 can participate in the preparation of bubble developer and can also be used to store bubble developer.

[0083] In this embodiment, the first mixing chamber unit 6 is used instead of the second syringe. The user only needs to hold the first syringe with one hand and push the piston of the first syringe to prepare the bubble developer. Unlike in Embodiments 1 or 2, where the user holds the first syringe with one hand and the second syringe with the other hand, and the two syringes push each other to mix the withdrawn blood with saline and air, which requires both hands to prepare the bubble developer, this embodiment only requires one hand, further facilitating the preparation of the bubble developer. The fourth limiting groove 37 engages with the limiting protrusion 24, and the two ends of the second liquid transfer hole 36 are respectively connected to the first interface 22 and the third interface 27. The bubble developer can be transferred between the first syringe and the second mixing chamber unit 7. The second mixing chamber unit 7 can participate in the preparation of the bubble developer and can also be used to store the bubble developer. The user can use the first syringe, and after working with the first mixing chamber unit 6 to prepare the bubble developer, store the first portion of the bubble developer in the first syringe, store the second portion of the bubble developer in the first mixing chamber unit 6, and then store the third portion of the bubble developer in the second mixing chamber unit 7 for standby use, thereby preparing bubble developer for three uses at one time, greatly saving preparation time.

[0084] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed by the present invention should be covered by the scope of protection of the present invention.

Claims

1. An indwelling needle for transcranial Doppler ultrasound imaging, characterized in that: It includes an injection unit, a mixing unit, a control valve unit, a first mixing chamber unit and a second mixing chamber unit. The injection unit, the first mixing chamber unit and the second mixing chamber unit are respectively connected to the mixing unit. The control valve unit is arranged in the mixing unit. The mixing unit is used to prepare a bubble developer and input it into the human body through the injection unit. The control valve unit is used to switch the preparation and delivery path of the bubble developer; the first mixing chamber unit and the second mixing chamber unit are respectively used to work together with the first syringe to prepare and store the bubble developer.

2. The indwelling needle for transcranial Doppler ultrasound imaging according to claim 1, characterized in that: The injection unit includes an indwelling needle and a liquid passage. The indwelling needle is connected to the mixing unit through the liquid passage. The bubble developer prepared by the mixing unit is transported to the indwelling needle through the liquid passage and then injected into the human body.

3. The indwelling needle for transcranial Doppler ultrasound imaging according to claim 1, characterized in that: The mixing unit includes a shell, a first interface and a second interface. The first interface and the second interface are relatively arranged on both sides of the shell. One end of the shell is connected to the liquid tube, which is the liquid end. The shell includes a hollow part, and the first interface is used to connect the first syringe.

4. The indwelling needle for transcranial Doppler ultrasound imaging according to claim 3, characterized in that: The control valve unit includes a valve body and a first liquid transfer hole. The valve body is arranged in the hollow part of the shell. The first liquid transfer hole is arranged on the valve body. The first liquid transfer hole is used to connect the first interface and the second interface so that the bubble developer can flow between the first interface and the second interface.

5. The indwelling needle for transcranial Doppler ultrasound imaging according to claim 4, characterized in that: One end of the valve body close to the liquid pipe is a liquid guiding section, which can block the second interface and connect the first interface with the liquid pipe.

6. The indwelling needle for transcranial Doppler ultrasound imaging according to claim 4, characterized in that: The mixing unit further includes a limiting protrusion, which is arranged on the inner wall of the shell.

7. The indwelling needle for transcranial Doppler ultrasound imaging according to claim 6, characterized in that: The control valve unit also includes a first limiting groove, a second limiting groove and a third limiting groove. The first limiting groove, the second limiting groove and the third limiting groove are arranged in sequence along the axial direction of the valve body, and are all annularly opened on the outer wall surface of the valve body; the limiting protrusion can be connected to the first limiting groove, the second limiting groove or the third limiting groove respectively.

8. The indwelling needle for transcranial Doppler ultrasound imaging according to claim 7, characterized in that: The mixing unit further includes a third interface, which is arranged on the housing.

9. The indwelling needle for transcranial Doppler ultrasound imaging according to claim 8, characterized in that: The control valve unit further includes a second liquid transmission hole, which is provided on the valve body and is used to connect the first interface and the third interface so that the bubble developer can flow between the first interface and the third interface.

10. The indwelling needle for transcranial Doppler ultrasound imaging according to claim 9, characterized in that: The control valve unit also includes a fourth limiting groove, which is arranged on the valve body and has the same shape as the first limiting groove; the fourth limiting groove and the limiting protrusion are engaged, and the two ends of the second liquid transfer hole are respectively connected to the first interface and the third interface.

Images