An indwelling needle for transcranial Doppler ultrasound imaging

Abstract

The present invention relates to a indwelling needle for transcranial Doppler ultrasound imaging, belonging to the technical field of medical devices, and solves the problems that the valve of the three-way infusion adapter in the prior art is a rotary type, the valve is not tightly closed resulting in cross-flow, and it is easy to rotate to an inaccurate closed position, resulting in the valve not being tightly closed. The present invention includes an injection unit, a mixing unit and a control valve unit. The injection unit is connected to the mixing unit, and the control valve unit is arranged in the mixing unit. The mixing unit is used to prepare a bubble contrast agent and input it into the human body through the injection unit, and the control valve unit is used to switch the preparation and transmission path of the bubble contrast agent. The present invention realizes the closing of each end of the mixing unit by sliding the valve body, and realizes the limit of each stage of closing through the control valve unit. Compared with the existing rotary three-way infusion adapter, the limit is more clearly sensed through the control valve unit, and the valve is more firmly closed without cross-flow occurring.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly relates to an indwelling needle for transcranial Doppler ultrasound imaging. Background Art

[0002] With the accelerating pace of life and the changing lifestyle, the incidence of cerebrovascular diseases shows an increasing trend year by year and has a tendency to be younger. To avoid the impact of cerebrovascular diseases on health, how can we achieve early diagnosis and early treatment? Transcranial Doppler ultrasound is one of the indispensable important detection methods.

[0003] 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, so as to assist in diagnosing whether there are stenosis, occlusion or spasm in the intracranial arteries, as well as the location and degree of the lesions, bringing good news to patients with unexplained stroke, migraine and those in need of cerebrovascular monitoring.

[0004] When performing a special examination of transcranial Doppler ultrasound (TCD) - the bubble test, the dual-channel multi-depth TCD technology is adopted. The head frame is fixed, and the bilateral middle cerebral arteries are detected (for patients with poor temporal window ultrasound, the vertebral artery can be detected through the occipital window or para-occipital window). Puncture is performed on the right elbow vein. When breathing calmly and performing the standard Valsalva maneuver, activated saline is rapidly injected respectively, the embolic signals are monitored, and finally the embolic signals are quantitatively graded and a report is issued. Its purpose is to check whether there is a right-to-left shunt in the heart, help diagnose conditions such as patent foramen ovale, and can be used as a screening and diagnostic basis for the causes of unexplained migraine, stroke, etc.

[0005] When injecting activated saline currently, an indwelling needle is mostly implanted in the human body, a three-way infusion adapter is installed on the indwelling needle, and then syringes are respectively connected to the two ends of the three-way infusion adapter. One syringe contains saline, and the other syringe contains air. First, the syringe with saline is connected to the indwelling needle, and the blood in the indwelling needle is aspirated and mixed with the saline in the syringe. Then, one end of the indwelling needle is closed, and the two syringes at both ends are connected. The aspirated blood is mixed with saline and air by pushing the two syringes against each other to prepare a bubble contrast agent, and then the bubble contrast agent is injected into the human body, and the image is observed through the instrument to complete the test.

[0006] The valve of the existing three-way infusion adapter used in the test is a rotary type, and the on-off of different ends is controlled by rotating the valve. However, this three-way only relies on friction to achieve the limit after the valve rotates, which is prone to loose valve closure leading to cross-flow, and it is easy to rotate to an inaccurate closed position by rotation control, resulting in loose valve closure. Moreover, the connection between the needle body and the three-way infusion adapter also increases the steps of the test.

[0007] To this end, we propose a indwelling needle for transcranial Doppler ultrasound imaging. Summary of the Invention

[0008] In view of the above deficiencies of the prior art, the present invention provides an indwelling needle for transcranial Doppler ultrasound imaging. It is used to solve the problems that the valve of the three-way infusion joint in the prior art is a rotary type, the valve closure is not tight, resulting in cross-flow, and it is easy to rotate to an inaccurate closed position through rotation control, resulting in the valve closure not being tight.

[0009] To achieve the above invention purpose, the technical solution adopted by the present invention is:

[0010] An indwelling needle for transcranial Doppler ultrasound imaging, comprising 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 input it into the human body through the injection unit, and the control valve unit is used to switch the preparation and transmission paths of the bubble developer.

[0011] Further, the injection unit includes an indwelling needle body and a liquid passing tube. The indwelling needle body is connected to the mixing unit through the liquid passing tube. The bubble developer prepared by the mixing unit is transported to the indwelling needle body through the liquid passing tube and then input into the human body.

[0012] Further, the mixing unit includes a housing, a first interface and a second interface. The first interface and the second interface are relatively arranged on both sides of the housing. One end of the housing is connected to the liquid passing tube, and this end is the liquid passing end. The housing includes a hollow part. The first interface is used to connect a first syringe, and the second interface is used to connect a second syringe. The liquids of the first syringe and the second syringe can be exchanged through the mixing unit to prepare a bubble developer.

[0013] Further, the control valve unit includes a valve body and a first liquid transmission hole. The valve body is arranged in the hollow part of the housing, and the first liquid transmission hole is arranged on the valve body. The first liquid transmission hole is used to communicate the first interface and the second interface, so that the bubble developer can flow between the first interface and the second interface.

[0014] Further, one end of the valve body close to the liquid passing tube is a liquid guiding section, and the liquid guiding section is a wedge-shaped liquid guiding section.

[0015] Further, the surface of the liquid guiding section is an inner concave arc surface.

[0016] Further, the mixing unit further includes a limiting protrusion, and the limiting protrusion is arranged on the inner wall of the housing.

[0017] Further, the control valve unit further 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 sequentially arranged along the axial direction of the valve body, and are all circumferentially opened on the outer wall surface of the valve body; the limiting protrusion can be respectively connected to the first limiting groove, the second limiting groove, or the third limiting groove.

[0018] Further, a first pushing and pulling unit is further included. The first pushing and pulling unit includes a force application plate, a reaction force cross plate, and reaction force side plates. The force application plate is connected to the valve body. The force application plate is a rectangular force application plate. There are two reaction force side plates, which are respectively arranged at both ends in the width direction of the force application plate. The reaction force cross plate is arranged parallel to the force application plate at the top of the reaction force side plates.

[0019] Further, the outer wall of the housing is a square cylindrical outer wall. One end of the reaction force cross plate can be connected to the outer wall of the housing, so as to prevent the valve body from rotating circumferentially.

[0020] Further, a reinforcing rod is further arranged between the reaction force side plates and the reaction force cross plate. One end of the reinforcing rod is connected to the reaction force side plate, and the other end of the reinforcing rod is connected to the reaction force cross plate. The reinforcing rod is used to strengthen the connection between the reaction force side plates and the reaction force cross plate, and prevent the reaction force cross plate from rotating around the end of the reaction force side plate, resulting in operation failure.

[0021] Further, the mixing unit further includes a chute, and the chute is arranged on the inner wall at one end of the housing.

[0022] Further, a second pushing and pulling unit is further included. The second pushing and pulling unit includes a driving member, a connecting rod, and a rotating shaft. One end of the connecting rod is connected to the valve body, the other end of the connecting rod is rotatably connected to the rotating shaft, the rotating shaft is fixedly connected to 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.

[0023] Further, the mixing unit further includes a rack, and the rack is arranged on the inner wall of the housing.

[0024] Further, the driving member is a hand gear, and the driving member includes driving teeth, and the driving teeth can be connected to the rack.

[0025] A indwelling needle for transcranial Doppler ultrasound imaging 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 contrast agent and input it into the human body through the injection unit. The control valve unit is used to switch the preparation and transmission path of the bubble contrast agent; the first mixing chamber unit and the second mixing chamber unit are respectively used to cooperate with the first syringe to prepare and store the bubble contrast agent.

[0026] Further, the injection unit includes a retention needle body and a liquid delivery tube. The retention needle body is connected to the mixing unit through the liquid delivery tube. The bubble developer prepared by the mixing unit is transported to the retention needle body through the liquid delivery tube and then input into the human body.

[0027] Further, the mixing unit includes a housing, a first interface, and a second interface. The first interface and the second interface are oppositely arranged on both sides of the housing. One end of the housing is connected to the liquid delivery tube, and this end is the liquid delivery end. The housing includes a hollow part. The first interface is used to connect to a first syringe, and the second interface is used to connect to a second syringe. The liquids of the first syringe and the second syringe can be exchanged through the mixing unit to prepare the bubble developer.

[0028] Further, the control valve unit includes a valve body and a first liquid delivery hole. The valve body is arranged in the hollow part of the housing, and the first liquid delivery hole is arranged on the valve body. The first liquid delivery hole is used to connect the first interface and the second interface, enabling the bubble developer to flow between the first interface and the second interface.

[0029] Further, one end of the valve body close to the liquid delivery tube is a liquid guiding section, and the liquid guiding section is a wedge-shaped liquid guiding section. The liquid guiding section can block the second interface and can connect the first interface and the liquid delivery tube.

[0030] Further, the mixing unit further includes a limiting protrusion, and the limiting protrusion is arranged on the inner wall of the housing.

[0031] Further, the control valve unit further 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 sequentially arranged along the axial direction of the valve body and are all circumferentially opened on the outer wall surface of the valve body; the limiting protrusion can be respectively connected to the first limiting groove, the second limiting groove, or the third limiting groove.

[0032] Further, 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 towards the second interface direction, and the first piston is used to push the bubble developer in the hollow part of the first cylinder out of the first cylinder, so that the bubble developer returns to the first syringe.

[0033] Further, the first mixing chamber unit further includes a first ventilation hole, and the first ventilation hole is arranged on the free end of the first cylinder. The first ventilation hole is used to balance the air pressure in the first cylinder when introducing and discharging the bubble developer in the first cylinder.

[0034] Further, the mixing unit further includes a third interface, and the third interface is arranged on the housing.

[0035] Further, it further includes a second mixing chamber unit, and the structure of the second mixing chamber unit is the same as that of the first mixing chamber unit; the second mixing chamber unit includes a second cylinder body, a second piston, a second spring, and a second ventilation hole, and the second cylinder body is connected to the third interface; the second mixing chamber unit is used to cooperate with the first syringe to prepare and store the bubble developer.

[0036] Further, the control valve unit further includes a second liquid transfer hole, and the second liquid transfer hole 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 then the second portion of the bubble developer is stored in the second mixing chamber unit for standby. The bubble developer prepared once can be used twice, greatly saving the preparation time.

[0037] Further, the control valve unit further includes a fourth limiting groove, and the fourth limiting groove 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 both ends of the second liquid transfer hole are connected to the first interface and the third interface respectively.

[0038] Compared with the prior art, the present invention can at least achieve one of the following beneficial effects:

[0039] (1) The indwelling needle of the present invention fixedly connects the mixing unit to the injection unit, avoiding the on-site connection step between the mixing unit and the injection unit during the operation; the valve body is slidably arranged in the mixing unit, and the closures of the respective ends of the mixing unit are realized by sliding the valve body, and the limit of each stage of closure is realized through the control valve unit. Compared with the existing rotary three-way infusion connector, the limit by the control valve unit is more clearly perceived, and the valve closure is more stable, and there will be no cross-flow;

[0040] (2) Through the cooperation of the limiting groove and the limiting protrusion provided by the present invention, each cooperation of the limiting groove and the limiting protrusion corresponds to a closed state, and the control valve unit can play a sealing role while playing a limiting role;

[0041] (3) The hollow part of the housing of the present invention is a cylindrical hollow part, and the outer wall of the housing is a square tubular outer wall. One end of the reaction cross plate can be connected to the outer wall of the housing, thereby preventing the valve body from rotating circumferentially, ensuring that the liquid guiding section can block the second interface, and avoiding the situation of incomplete closure of the hollow part due to the deflection of the liquid guiding section and cross-flow; setting the surface of the liquid guiding section as an inner concave arc surface can make the liquid flow more smoothly;

[0042] (4) The driving teeth of the present invention increase the friction of the driving member. 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, enabling the user to push and pull the valve body with one hand, further facilitating the one-handed operation of the indwelling needle by the user.

[0043] (5) The present invention uses the first mixing chamber unit to replace 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. Different from the prior art where the user holds the first syringe with one hand and the second syringe with the other hand, and the two syringes are pushed against each other to mix the aspirated blood with normal saline and air, the preparation of the bubble developer requires both hands. The present invention only needs to use one hand, further facilitating the preparation operation of the bubble developer.

[0044] (6) In the present invention, the fourth limiting groove and the limiting protrusion are engaged. The two ends of the second liquid transfer hole are respectively connected to the first interface and the third interface. 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, in cooperation 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. The bubble developer for three uses can be prepared at one time, saving the preparation time.

[0045] In the present invention, the above technical solutions can be combined with each other to achieve more preferred combination schemes. Other features and advantages of the present invention will be described in the following content. Moreover, some advantages can be made obvious from the description or can be understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the content specifically pointed out in the text and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a schematic diagram of the overall structure of the indwelling needle;

[0047] Figure 2 It is a schematic diagram of the internal structure of the mixing unit, control valve unit, and first push-pull unit of Embodiment 1;

[0048] Figure 3 It is a schematic side view structure of the mixing unit and the first push-pull unit of Embodiment 1;

[0049] Figure 4 It is a schematic diagram of the overall structure of the valve body;

[0050] Figure 5Schematic structural diagram of the mixing unit and the second push-pull unit in Embodiment 2;

[0051] Figure 6 Schematic internal structural diagram of the mixing unit, the control valve unit and the second push-pull unit in Embodiment 2;

[0052] Figure 7 Front view structural diagram of the mixing unit and the control valve unit in Embodiment 3;

[0053] Figure 8 Schematic internal structural diagram of the mixing unit and the control valve unit in Embodiment 3.

[0054] Reference numerals:

[0055] 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 body; 12 - liquid passage tube; 21 - housing; 22 - first interface; 23 - second interface; 24 - limit projection; 25 - chute; 26 - rack; 27 - third interface; 31 - valve body; 32 - first liquid transmission hole; 33 - first limit groove; 34 - second limit groove; 35 - third limit groove; 36 - second liquid transmission hole; 37 - fourth limit groove; 41 - force application plate; 42 - reaction cross plate; 43 - reaction side plate; 44 - reinforcing rod; 51 - driving member; 52 - connecting rod; 53 - rotating shaft; 61 - first cylinder; 62 - first piston; 63 - first spring; 64 - first ventilation hole; 71 - second cylinder; 72 - second piston; 73 - second spring; 74 - second ventilation hole. Detailed implementation manners

[0056] The following describes the detailed implementation manners of the present invention to facilitate those skilled in the art of this technology to understand the present invention. However, it should be clear that the present invention is not limited to the scope of the detailed implementation manners. For those of ordinary skill in the art of this technology, as long as various changes are within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions and creations using the concept of the present invention are within the scope of protection.

[0057] Embodiment 1:

[0058] As Figure 1 shown, an indwelling needle for transcranial Doppler ultrasound imaging (hereinafter referred to as the 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 arranged in the mixing unit 2. The mixing unit 2 is used to prepare a bubble contrast agent and input it into the human body through the injection unit 1, and the control valve unit 3 is used to switch the preparation and transmission paths of the bubble contrast agent.

[0059] Preferably, the injection unit 1 includes an indwelling needle body 11 and a liquid delivery tube 12. The indwelling needle body 11 is connected to the mixing unit 2 through the liquid delivery tube 12. The bubble developer prepared by the mixing unit 2 is delivered to the indwelling needle body 11 through the liquid delivery tube 12 and then input into the human body.

[0060] Preferably, as Figure 2 shown, the mixing unit 2 includes 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 both sides of the housing 21. One end of the housing 21 is connected to the liquid delivery tube 12, and this end is the liquid delivery end. The housing 21 includes a hollow part, and the control valve unit 3 is arranged in the hollow part. The first interface 22 is used to connect a first syringe (not shown in the figure), and the second interface 23 is used to connect a second syringe (not shown in the figure). The liquids and gases of the first syringe and the second syringe can be exchanged through the mixing unit 2, thereby preparing the bubble developer.

[0061] Preferably, the control valve unit 3 includes a valve body 31 and a first liquid transmission hole 32. The valve body 31 is arranged in the hollow part of the housing 21, and the first liquid transmission hole 32 is arranged on the valve body 31. The valve body 31 is used to seal the hollow part and adjust the liquid flow direction in the hollow part. The first liquid transmission hole 32 is used to connect the first interface 22 and the second interface 23, so that the bubble developer can flow between the first interface 22 and the second interface 23.

[0062] Preferably, one end of the valve body 31 close to the liquid delivery tube 12 is a liquid guiding section, and the liquid guiding section is a wedge-shaped liquid guiding section. The liquid guiding section can block the second interface 23 and connect the first interface 22 with the liquid delivery tube 12. Preferably, the surface of the liquid guiding section is an inner concave arc surface to make the liquid delivery smoother; and the outer diameter of the valve body 31 is the same as the inner diameter of the housing 21, and the valve body 31 can effectively seal the housing 21.

[0063] Preferably, as Figure 2 and Figure 4 shown, the mixing unit 2 further includes a limit protrusion 24, and the limit protrusion 24 is arranged on the inner wall of the housing 21. The control valve unit 3 further includes a first limit groove 33, a second limit groove 34, and a third limit groove 35. The first limit groove 33, the second limit groove 34, and the third limit groove 35 are sequentially arranged along the axial direction of the valve body 31 and are all circumferentially opened on the outer wall surface of the valve body 31. The limit protrusion 24 is used to prevent the valve body 31 from generating relative displacement with the housing 21 and ensure the accurate position of the valve body 31 in the housing 21.

[0064] Preferably, when the first limiting groove 33 and the limiting protrusion 24 are engaged, the liquid passing 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 passing end is in a closed state, and the first interface 22 and the second interface 23 are in a communicating state. When the third limiting groove 35 and the limiting protrusion 24 are engaged, the first interface 22 and the liquid passing end are in a communicating 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 between 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 housing 21, which facilitates the surgical operation.

[0065] Preferably, as Figure 2 and Figure 3 shown, in order to facilitate the pushing and pulling of the control valve unit 3, the indwelling needle of this embodiment further includes a first pushing and pulling unit 4. The first pushing and pulling unit 4 includes a force applying plate 41, a reaction force cross plate 42 and reaction force side plates 43. The force applying plate 41 is connected to the valve body 31. The force applying plate 41 is a rectangular force applying plate. There are two reaction force side plates 43, which are respectively arranged at both ends in the width direction of the force applying plate 41. The reaction force cross plate 42 is arranged parallel to the force applying plate 41 at the top of the reaction force side plates 43. The user can use two fingers to pull the force applying plate 41, so as to pull the valve body 31 out of the housing 21. The user can also use one finger to push the reaction force cross plate 42, so as to push the valve body 31 into the housing 21, which greatly facilitates the operation of the user.

[0066] Preferably, the valve body 31 is cylindrical, the hollow part of the housing 21 is a cylindrical hollow part, and the outer wall of the housing 21 is a square cylindrical outer wall. One end of the reaction force cross plate 42 can be connected to the outer wall of the housing 21, so as to prevent the valve body 31 from rotating circumferentially and ensure that the liquid guiding section can block the second interface 23.

[0067] Preferably, a reinforcing rod 44 is further provided between the reaction force side plates 43 and the reaction force cross plate 42. One end of the reinforcing rod 44 is connected to the reaction force side plates 43, and the other end of the reinforcing rod 44 is connected to the reaction force cross plate 42. The reinforcing rod 44 is used to strengthen the connection between the reaction force side plates 43 and the reaction force cross plate 42, and prevent the reaction force cross plate 42 from rotating around the end of the reaction force side plates 43, resulting in the failure of the operation.

[0068] 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.

[0069] 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.

[0070] Example 2:

[0071] To facilitate the single - hand operation of the indwelling needle by the user, as Figure 5 shown, in this embodiment, the second push - pull unit 5 is used to replace the first push - pull unit 4, and the mixing unit 2 of Embodiment 1 is improved. The user can hold the mixing unit 2 with one hand and perform the push - pull operation on the valve body 31 of the control valve unit 3 with a single hand, and the operation is simple and fast.

[0072] Preferably, as Figure 6 shown, compared with Embodiment 1, the housing 21 is lengthened, and the mixing unit 2 is newly provided with a sliding groove 25. The sliding groove 25 is arranged on the inner wall at 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, 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, the driving member 51 can rotate around the rotating shaft 53, the end of the rotating shaft 53 is arranged in the sliding groove 25, and the driving member 51 can slide along the sliding groove 25. The user holds the housing 21 with one hand, and then uses the thumb of the same hand to push and pull the driving member 51, so as to perform the push - pull operation on the valve body 31 with a single hand, which facilitates the single - hand operation of the indwelling needle by the user.

[0073] Preferably, the mixing unit 2 further includes a rack 26, and the rack 26 is arranged on the inner wall of the housing 21. The driving member 51 is a hand - gear, and the driving member 51 includes driving teeth, and the driving teeth can be connected to the rack 26. The driving teeth increase the friction of the driving member 51, and the driving teeth are meshed with the rack 26 to prevent the user from slipping when pushing and pulling the driving member 51; the user holds the housing 21 with one hand, and then uses the thumb of the same hand to turn the driving member 51, so as to perform the push - pull operation on the valve body 31 with a single hand, further facilitating the single - hand operation of the indwelling needle by the user.

[0074] Example 3:

[0075] As Figure 7 shown, in this embodiment, the structures of the mixing unit 2 and the control valve unit 3 of Embodiment 1 or 2 are further improved, so that the indwelling needle of this embodiment can be operated with a single hand.

[0076] In the prior art, the user holds the first syringe with one hand and the second syringe with the other hand, and the two syringes are pushed against each other so that the aspirated blood is mixed with physiological saline and air. Preparing the bubble contrast agent requires both hands. Preferably, as Figure 7 shown, the indwelling needle of this embodiment further includes a first mixing chamber unit 6, and the first mixing chamber unit 6 is used to replace the second syringe and act together with the first syringe to prepare the bubble contrast agent.

[0077] Preferably, as 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 disposed in the hollow portion 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 in the direction of the second interface 23, and the first piston 62 is used to push the bubble developer in the hollow portion of the first cylinder 61 out of the first cylinder 61, so that the bubble developer returns to the first syringe.

[0078] Preferably, the first mixing chamber unit 6 further includes a first ventilation hole 64. The first ventilation hole 64 is provided at the free end of the first cylinder 61 and is used to balance the air pressure in the first cylinder 61 when introducing and discharging the bubble developer in the first cylinder 61.

[0079] In clinical applications, due to individual differences, some cases require multiple portions of bubble developer. If the user operates the indwelling needle in Embodiment 1 or 2, the bubble developer needs to be prepared multiple times. Preferably, as Figure 7 and Figure 8 shown, the mixing unit 2 further includes a third interface 27. The third interface 27 is provided on the housing 21. The indwelling needle of this embodiment further includes a second mixing chamber unit 7, and the structure of the second mixing chamber unit 7 is the same as that of the first mixing chamber unit 6. The second mixing chamber unit 7 includes a second cylinder 71, a second piston 72, a second spring 73, and a second ventilation hole 74. The second cylinder 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.

[0080] Preferably, in order to control the on-off 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, so that the bubble developer can flow between the first interface 22 and the third interface 27. When in use, the user can use the first syringe. After cooperating 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, preparing the bubble developer for three uses at one time, which greatly saves the preparation time.

[0081] Preferably, in order to locate the position of the second liquid transfer hole 36 in the valve body 31, the control valve unit 3 further includes a fourth limiting groove 37. The fourth limiting groove 37 is provided on the valve body 31, and the shape of the fourth limiting groove 37 is the same as that of the first limiting groove 33. The fourth limiting groove 37 is engaged with the limiting protrusion 24. Both ends of the second liquid transfer hole 36 are respectively connected to the first interface 22 and the third interface 27. During use, 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 for storing the bubble developer.

[0082] In this embodiment, the first mixing chamber unit 6 is used to replace 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. Different from Embodiment 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 are pushed against each other so that the aspirated blood is mixed with physiological saline and air, and the preparation of the bubble developer requires both hands, this embodiment only requires one hand, further facilitating the preparation operation of the bubble developer; the fourth limiting groove 37 is engaged with the limiting protrusion 24, and both 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 for storing the bubble developer. The user can use the first syringe, in cooperation 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. One preparation can provide bubble developer for three uses, greatly saving the preparation time.

[0083] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention.

Claims

1. An indwelling needle for transcranial Doppler ultrasound imaging, characterized in that, It includes an injection unit (1), a mixing unit (2), a control valve unit (3) and a second push-pull unit (5). The injection unit (1) is connected to the mixing unit (2). The control valve unit (3) is arranged inside the mixing unit (2). The mixing unit (2) is used to prepare a bubble developer and input it into the human body through the injection unit (1). The control valve unit (3) is used to switch the preparation and transmission paths of the bubble developer; The mixing unit (2) includes a housing (21), a chute (25) and a rack (26). The chute (25) is arranged on the inner wall at one end of the housing (21), and the rack (26) is arranged on the inner wall of the housing (21); The control valve unit (3) includes a valve body (31) and a first liquid transmission hole (32). The valve body (31) is arranged in the hollow part of the housing (21). The first liquid transmission hole (32) is arranged on the valve body (31). The first liquid transmission hole (32) is used to connect the first interface (22) and the second interface (23) of the mixing unit (2), so that the bubble developer can flow between the first interface (22) and the second interface (23). The outer diameter of the valve body (31) is the same as the inner diameter of the housing (21), and the valve body (31) can block the housing (21); One end of the valve body (31) close to the liquid conveying pipe (12) is a liquid guiding section, and the liquid guiding section can block the second interface (23) and connect the first interface (22) with the liquid conveying pipe (12); 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). The driving member (51) can rotate around the rotating shaft (53). The end of the rotating shaft (53) is arranged in the chute (25). The driving member (51) is a hand gear, and the driving member (51) includes driving teeth, and the driving teeth can engage with the rack (26) to prevent slipping when the user pushes and pulls the driving member (51); The user holds the housing (21) with one hand and then uses the thumb of the same hand to turn the driving member (51), and can push and pull the valve body (31) with one hand.

2. The indwelling needle for transcranial Doppler ultrasound imaging according to claim 1, wherein The injection unit (1) includes a indwelling needle body (11) and a liquid conveying pipe (12). The indwelling needle body (11) is connected to the mixing unit (2) through the liquid conveying pipe (12). The bubble developer prepared by the mixing unit (2) is transported to the indwelling needle body (11) through the liquid conveying pipe (12) and then input into the human body.

3. The indwelling needle for transcranial Doppler ultrasound imaging according to claim 2, wherein The first interface (22) and the second interface (23) are oppositely arranged on both sides of the housing (21). One end of the housing (21) is connected to the liquid conveying pipe (12). The first interface ( 4. The indwelling needle for transcranial Doppler ultrasound imaging according to claim 1, characterized in that, ​ 5. The indwelling needle for transcranial Doppler ultrasound imaging according to claim 4, wherein ​ 6. The indwelling needle for transcranial Doppler ultrasound imaging according to claim 3, wherein ​ 7. The indwelling needle for transcranial Doppler ultrasound imaging according to claim 6, characterized in that, The control valve unit (3) further includes 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 all circumferentially formed on the outer wall surface of the valve body (31); the limiting protrusion (24) can be respectively connected to the first limiting groove (33), the second limiting groove (34), or the third limiting groove (35).

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