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 and a control valve unit, the injection unit is connected with the mixing unit, the control valve unit is arranged in the mixing unit, the mixing unit is used for preparing the bubble developer and inputting the bubble developer into a human body through the injection unit, and the control valve unit is used for switching preparation and conveying paths of the bubble developer. According to the three-way infusion connector, sealing of all ends of the mixing unit is achieved through the sliding valve body, limiting of sealing of each stage is achieved through the control valve unit, and compared with an existing rotary three-way infusion connector, limiting is conducted through the control valve unit, sensing is clearer, valve sealing is more stable, and series flow is avoided.

Description

Technical Field

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

[0002] With the accelerated pace of life and changes in lifestyle, the incidence of cerebrovascular diseases has been increasing year by year, and there is a tendency for younger people to suffer from them. In order 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 and 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, thereby assisting in diagnosing whether the intracranial arteries are stenotic, occluded or spasmodic, as well as the location and extent of the lesions. It brings good news to patients with unexplained stroke, migraine and those who need cerebrovascular monitoring.

[0004] During the special transcranial Doppler ultrasound (TCD) examination - the bubble test, dual-channel multi-depth TCD technology is used, the head frame is fixed, the bilateral middle cerebral arteries are detected (the vertebral arteries can be detected through the occipital window or paraoccipital window for 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 quickly injected and the embolic signals are monitored. Finally, the embolic signals are 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 the causes of unexplained migraine and stroke.

[0005] In the 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 withdrawn blood is mixed with the saline and air by pushing the syringes at both ends against each other to prepare a bubble developer. The bubble developer is then pushed into the human body, and the image is observed by an instrument to achieve the test.

[0006] 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 limit the position of the valve after rotation, 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. The connection between the needle body and the three-way infusion connector also increases the steps of the test.

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

[0008] In view of the above-mentioned deficiencies of the prior art, the present invention provides an indwelling needle for transcranial Doppler ultrasound imaging, which is used to solve the problem that the valve of the three-way infusion connector in the prior art is a rotary type, the valve is not tightly closed, resulting in cross-flow, and the rotary control is easy to fail to rotate to the accurate closed position, resulting in the valve not being tightly closed.

[0009] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is:

[0010] An indwelling needle 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 input it into a human body through the injection unit, and the control valve unit is used to switch the preparation and transmission path of the bubble developer.

[0011] Furthermore, the injection unit includes an indwelling needle body and a liquid passage tube, the indwelling needle body 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 body through the liquid passage tube and then injected into the human body.

[0012] 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 two sides of the shell, one end of the shell is connected to the liquid passing tube, and this end is the liquid passing end. The shell includes a hollow portion, 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.

[0013] Furthermore, the control valve unit includes a valve body and a first liquid transfer hole. The valve body is arranged in the hollow portion 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.

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

[0015] Furthermore, the surface of the liquid-conducting section is a concave arc surface.

[0016] Furthermore, the mixing unit further comprises a limiting protrusion, and the limiting protrusion is arranged on the inner wall of the shell.

[0017] Furthermore, the control valve unit also includes 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 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.

[0018] Furthermore, it also includes a first push-pull unit, which includes a force plate, a reaction force transverse plate and a reaction force side plate. The force plate is connected to the valve body, the force plate is a rectangular force plate, there are two reaction force side plates, and they are respectively arranged at both ends of the force plate in the width direction, and the reaction force transverse plate is arranged parallel to the force plate at the top of the reaction force side plate.

[0019] Furthermore, the outer wall of the shell is a square cylindrical outer wall, and 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.

[0020] Furthermore, a reinforcing rod is provided between the reaction side plate and the reaction cross plate, one end of the reinforcing rod is connected to the reaction side plate, and the other end of the reinforcing rod is connected to the reaction cross plate. The reinforcing rod is used to strengthen the connection between the reaction side plate and the reaction cross plate to prevent the reaction cross plate from rotating around the end of the reaction side plate, causing operation failure.

[0021] Furthermore, the mixing unit further comprises a slide groove, which is arranged on an inner wall at one end of the shell.

[0022] Furthermore, it also includes a second push-pull unit, which includes a driving member, a connecting rod and a rotating shaft. One end of the connecting rod is connected to the valve body, and the other end of the connecting rod is rotatably connected to the rotating shaft. The rotating shaft is fixedly connected to the driving member, and the driving member can rotate around the rotating shaft. The end of the rotating shaft is arranged in a slide groove, and the driving member can slide along the slide groove.

[0023] Furthermore, the mixing unit further comprises a rack, which is arranged on the inner wall of the shell.

[0024] Furthermore, 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 retention needle 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 a human body through the injection unit. The control valve unit is used to switch the preparation and transmission path of the bubble developer. The first mixing chamber unit and the second mixing chamber unit are respectively used to cooperate with a first syringe to prepare and store the bubble developer.

[0026] Furthermore, the injection unit includes an indwelling needle body and a liquid passage tube, the indwelling needle body 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 body through the liquid passage tube and then injected into the human body.

[0027] 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 two sides of the shell, one end of the shell is connected to the liquid passing tube, and this end is the liquid passing end. The shell includes a hollow portion, 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.

[0028] Furthermore, the control valve unit includes a valve body and a first liquid transfer hole. The valve body is arranged in the hollow portion 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.

[0029] Furthermore, one end of the valve body close to the liquid passage 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 passage.

[0030] Furthermore, the mixing unit further comprises a limiting protrusion, and the limiting protrusion is arranged on the inner wall of the shell.

[0031] Furthermore, the control valve unit also includes 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 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.

[0032] 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 portion 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 portion of the first cylinder out of the first cylinder, thereby returning the bubble developer to the first syringe.

[0033] Furthermore, the first mixing chamber unit also includes a first vent hole, which is arranged on the free end of the first cylinder, and the first vent hole is used to balance the air pressure in the first cylinder when the bubble developer is introduced and exported into and out of the first cylinder.

[0034] Furthermore, the mixing unit also includes a third interface, and the third interface is arranged on the shell.

[0035] 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.

[0036] Furthermore, the control valve unit also includes a second liquid transfer hole, which is arranged on the valve body, and 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.

[0037] Furthermore, 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.

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

[0039] (1) The indwelling needle of the present invention fixedly connects the mixing unit to the injection unit, thereby avoiding the on-site connection step of the mixing unit and the injection unit during the operation; 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;

[0040] (2) By providing the limiting groove and the limiting protrusion in cooperation with each other in the present invention, each limiting groove and the limiting protrusion cooperate with each other to correspond to a closed state, and the control valve unit can play a sealing role while playing a limiting role;

[0041] (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;

[0042] (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, so that the valve body can be pushed or pulled with one hand, which further facilitates the user to operate the indwelling needle with one hand;

[0043] (5) The present invention uses the first mixing chamber unit to replace the 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 physiological saline and air, and the preparation of the bubble developer requires both hands. The present invention only requires one hand, which further facilitates the preparation operation of the bubble developer.

[0044] (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 to work together with the first mixing chamber unit to prepare the bubble developer, and then 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, and then store the third portion of the bubble developer in the second mixing chamber unit for standby use. The bubble developer for three uses can be prepared at one time, saving preparation time.

[0045] In the present invention, the above-mentioned technical solutions can be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the following content, and some advantages can become obvious from the description or be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained through the contents particularly pointed out in the 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 Schematic diagram of the internal structure of the mixing unit, the control valve unit and the first push-pull unit of Example 1;

[0048] Figure 3 It is a side structural schematic diagram of the mixing unit and the first push-pull unit of Example 1;

[0049] Figure 4 It is the overall structural diagram of the valve body;

[0050] Figure 5It is a schematic structural diagram of the mixing unit and the second push-pull unit of Example 2;

[0051] 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;

[0052] Figure 7 is a front view structural schematic diagram of a mixing unit and a control valve unit of Example 3;

[0053] Figure 8 Schematic diagram of the internal structure of the mixing unit and the control valve unit of Example 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; 12-fluid passage tube; 21-housing; 22-first interface; 23-second interface; 24-limiting protrusion; 25-slide; 26-rack; 27-third interface; 31-valve body; 32-first liquid transmission hole; 33-first limiting groove; 3 4-second limiting groove; 35-third limiting groove; 36-second liquid transfer 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 ventilation hole; 71-second cylinder; 72-second piston; 73-second spring; 74-second ventilation hole. DETAILED DESCRIPTION

[0056] The specific implementation modes of the present invention are described below so that those skilled in the art can understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific implementation modes. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations utilizing the concept of the present invention are protected.

[0057] Embodiment 1:

[0058] 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, wherein 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 developer and input it into a human body through the injection unit 1, and the control valve unit 3 is used to switch the preparation and delivery path of the bubble developer.

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

[0060] Preferably, Figure 2 As shown, the mixing unit 2 includes a shell 21, a first interface 22 and a second interface 23, the first interface 22 and the second interface 23 are relatively arranged on both sides of the shell 21, one end of the shell 21 is connected to the liquid passing tube 12, and this end is the liquid passing end. The shell 21 includes a hollow portion, and the control valve unit 3 is arranged in the hollow portion. 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 liquid and gas of the first syringe and the second syringe can be exchanged through the mixing unit 2, so as to prepare a bubble developer.

[0061] Preferably, the control valve unit 3 includes a valve body 31 and a first liquid transfer hole 32. The valve body 31 is arranged in the hollow portion of the shell 21, and the first liquid transfer hole 32 is arranged on the valve body 31. The valve body 31 is used to close the hollow portion and adjust the flow direction of the liquid in the hollow portion. The first liquid transfer 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 pipe 12 is a liquid guide section, which is a wedge-shaped liquid guide section, and the liquid guide section can block the second interface 23 and connect the first interface 22 with the liquid pipe 12. Preferably, the surface of the liquid guide section is a concave arc surface, so that the liquid is transported more smoothly; 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 block the housing 21.

[0063] Preferably, Figure 2 and Figure 4 As shown, the mixing unit 2 further includes a limiting protrusion 24, which is arranged on the inner wall of the housing 21. The control valve unit 3 further includes a first limiting groove 33, a second limiting groove 34 and a third limiting groove 35, which are sequentially arranged along the axial direction of the valve body 31 and are all annularly opened on the outer wall surface of the valve body 31. The limiting protrusion 24 is used to prevent the valve body 31 and the housing 21 from relative displacement, 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 connected 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 connected state, and the second interface 23 is in a closed state. When the limiting protrusion 24 is respectively engaged with the first limiting groove 33, the second limiting groove 34 or the third limiting groove 35, the user can clearly perceive the sense of passage, understand whether the connection between each limiting groove and the limiting protrusion 24 is established, and can clearly know the relative position relationship between the valve body 31 and the housing 21, which is convenient for surgical operation.

[0065] Preferably, Figure 2 and Figure 3 As 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 push-pull unit 4, which includes a force plate 41, a reaction force horizontal plate 42 and a reaction force side plate 43. The force plate 41 is connected to the valve body 31. The force plate 41 is a rectangular force plate. There are two reaction force side plates 43, which are respectively arranged at both ends of the force plate 41 in the width direction. The reaction force horizontal plate 42 is arranged parallel to the force plate 41 at the top of the reaction force side plate 43. The user can use two fingers to pull the force plate 41 to pull the valve body 31 outward from the housing 21, and the user can also use one finger to push the reaction force horizontal plate 42 to push the valve body 31 into the housing 21, which greatly facilitates the user's operation.

[0066] Preferably, the valve body 31 is cylindrical, the hollow portion of the shell 21 is a cylindrical hollow portion, the outer wall of the shell 21 is a square cylindrical outer wall, and one end of the reaction force cross plate 42 can be connected to the outer wall of the shell 21, thereby preventing the valve body 31 from rotating circumferentially and ensuring that the liquid guiding section can block the second interface 23.

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

[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, the valve body 31 needs to be pulled up first 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, and the first syringe is filled with physiological saline. The extracted blood and the physiological saline are mixed to form a mixed liquid. After the blood is extracted, the valve body 31 is pressed down so that the first syringe is connected to the first interface 22. When the second limiting groove 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 make the mixed liquid fully mixed, 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 make the third limiting groove 35 and the limiting protrusion 24 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, 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] Compared with the prior art, the mixing unit 2 is fixedly connected to the injection unit 1, thereby avoiding the on-site connection step of the mixing unit 2 and the injection unit 1 during use; the valve body 31 is slidably arranged 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 limiting of each level of closure is achieved by controlling the valve unit 3. Compared with the existing rotary three-way infusion connector, the limiting is performed by the control valve unit 3, the perception is clearer, and the valve closure is more stable, and cross-flow will not occur; by setting three limiting grooves and a limiting protrusion 24, each limiting groove and the limiting protrusion 24 cooperate to 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 a fulcrum for the palm of the person's hand, 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 as an inner concave arc surface to make the liquid flow smoother.

[0070] Embodiment 2:

[0071] In order to facilitate the user to operate the indwelling needle with one hand, Figure 5 As shown, in this embodiment, the second push-pull unit 5 replaces the first push-pull unit 4, and improves the mixing unit 2 of embodiment 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.

[0072] Preferably, Figure 6 As shown, relative to Example 1, the housing 21 is lengthened, and the mixing unit 2 is newly provided with a slide groove 25, which 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, 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 slide groove 25, and the driving member 51 can slide along the slide 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 that the valve body 31 can be pushed and pulled with one hand, which is convenient for the user to operate the indwelling needle with one hand.

[0073] Preferably, the mixing unit 2 further comprises a rack 26, which is arranged on the inner wall of the housing 21. The driving member 51 is a hand gear, and the driving member 51 comprises driving teeth, which can be connected to the rack 26. The driving teeth increase the friction of the driving member 51, and the driving teeth are engaged 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 that the valve body 31 can be pushed and pulled with one hand, which further facilitates the user to operate the indwelling needle with one hand.

[0074] Embodiment 3:

[0075] 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.

[0076] 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 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, which is used to replace the second syringe and work together with the first syringe to prepare the bubble developer.

[0077] 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.

[0078] Preferably, the first mixing chamber unit 6 further includes a first vent hole 64 , which is disposed on the free end of the first cylinder 61 , and is used to balance the air pressure in the first cylinder 61 when the bubble developer is introduced into and exported from the first cylinder 61 .

[0079] In clinical applications, due to individual differences, some cases require the use of multiple sets of 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, 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 barrel 71, a second piston 72, a second spring 73 and a second vent 74, and 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.

[0080] Preferably, in order 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, which is arranged 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 to work 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 store the third portion of the bubble developer in the second mixing chamber unit 7 for standby use, so that the bubble developer for three uses can be prepared 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, which is arranged on the valve body 31, and the shape of the fourth limiting groove 37 is the same as the first limiting groove 33. The fourth limiting groove 37 is engaged 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. When in 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 to store the bubble developer.

[0082] This embodiment uses the first mixing chamber unit 6 to replace the 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. Different from the embodiment 1 or 2 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 saline and air, the preparation of the bubble developer requires both hands. This embodiment only requires one hand, which further facilitates the preparation operation of the bubble developer; the fourth limiting groove 37 and the limiting protrusion 24 are engaged, and the two ends of the second liquid transfer hole 36 are respectively connected to the first interface 22 and the third interface 27, and 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, in conjunction with the first mixing chamber unit 6, to prepare the bubble developer, and then 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 standby use, thereby preparing bubble developer for three uses at one time, greatly saving preparation time.

[0083] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. An indwelling needle for transcranial Doppler ultrasound imaging, characterized in that: The invention comprises 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); the control valve unit (3) is arranged in the mixing unit (2); the mixing unit (2) is used to prepare a bubble developer and to input the bubble developer into a human body through the injection unit (1); and the control valve unit (3) is used to switch the preparation and delivery path of the bubble developer.

2. The indwelling needle for transcranial Doppler ultrasound imaging according to claim 1, characterized in that: The injection unit (1) comprises an indwelling needle body (11) and a liquid passage tube (12); the indwelling needle body (11) is connected to the mixing unit (2) via the liquid passage tube (12); the bubble developer prepared by the mixing unit (2) is transported to the indwelling needle body (11) via the liquid passage tube (12) and then injected into the human body.

3. The indwelling needle for transcranial Doppler ultrasound imaging according to claim 2, characterized in that: The mixing unit (2) comprises a housing (21), a first interface (22) and a second interface (23), wherein the first interface (22) and the second interface (23) are arranged on two sides of the housing (21) opposite to each other, one end of the housing (21) is connected to a liquid passage tube (12), the first interface (22) is used to connect a first syringe, and the second interface (23) is used to connect a second syringe, and liquids in the first syringe and the second syringe can be exchanged through the mixing unit (2), thereby preparing a bubble developer.

4. The indwelling needle for transcranial Doppler ultrasound imaging according to claim 3, characterized in that: The control valve unit (3) comprises a valve body (31) and a first liquid transfer hole (32); the valve body (31) is arranged in a hollow portion of the housing (21); the first liquid transfer hole (32) is arranged on the valve body (31); the first liquid transfer 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).

5. The indwelling needle for transcranial Doppler ultrasound imaging according to claim 4, characterized in that: One end of the valve body (31) close to the liquid passage pipe (12) is a liquid guiding section, and the liquid guiding section is a wedge-shaped liquid guiding section.

6. The indwelling needle for transcranial Doppler ultrasound imaging according to claim 5, characterized in that: The surface of the liquid-conducting section is a concave arc surface.

7. The indwelling needle for transcranial Doppler ultrasound imaging according to claim 4, characterized in that: The mixing unit (2) further comprises a limiting protrusion (24), and the limiting protrusion (24) is arranged on the inner wall of the housing (21).

8. The indwelling needle for transcranial Doppler ultrasound imaging according to claim 7, characterized in that: The control valve unit (3) further comprises a first limiting groove (33), a second limiting groove (34) and a third limiting groove (35), wherein the first limiting groove (33), the second limiting groove (34) and the third limiting groove (35) are arranged in sequence along the axial direction of the valve body (31) and are all annularly opened on the outer wall surface of the valve body (31); the limiting protrusion (24) can be connected to the first limiting groove (33), the second limiting groove (34) or the third limiting groove (35) respectively.

9. The indwelling needle for transcranial Doppler ultrasound imaging according to claim 4, characterized in that: The valve body (31) further comprises a first push-pull unit (4), the first push-pull unit (4) comprising a force plate (41), a reaction force transverse plate (42) and a reaction force side plate (43), the force plate (41) being connected to the valve body (31), the force plate (41) being a rectangular force plate, the reaction force side plates (43) being arranged at both ends of the force plate (41) in the width direction, and the reaction force transverse plate (42) being arranged parallel to the force plate (41) at the top end of the reaction force side plate (43).

10. The indwelling needle for transcranial Doppler ultrasound imaging according to claim 9, characterized in that: The outer wall of the shell (21) is a square cylindrical outer wall, and one end of the reaction force horizontal plate (42) can be connected to the outer wall of the shell (21), thereby preventing the valve body (31) from rotating in the circumferential direction.

Images