High-pressure injector capable of adjusting injection pressure in real time

Abstract

The high-pressure injector capable of adjusting the injection pressure in real time comprises a machine body, a piston rod arranged in the machine body and a driving mechanism controlling the piston rod to stretch and move, a needle cylinder is detachably installed at the position, corresponding to the piston rod, of the machine body, and the piston rod can reciprocate in the needle cylinder. Pressure sensors are mounted at the ends of the piston rods; a displacement detection assembly is arranged in the machine body; a control module is integrated in the machine body, and the driving mechanism, the pressure sensor and the displacement detection assembly are all in electrical feedback connection with the control module. When the pressure sensor monitors that the internal pressure of the needle cylinder reaches a critical value, the control module can control the piston rod to retreat by a certain stroke through the driving mechanism and then control the piston rod to decelerate and advance forwards. The utility model has the beneficial effects that a contrast agent can be prevented from being injected into the blood vessel of a patient under the condition that the critical pressure is exceeded, so that the conditions of vascular rupture, vascular intima injury, contrast agent exosmosis and the like are prevented.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a high-pressure injector capable of adjusting injection pressure in real time. Background Technology

[0002] High-pressure injectors, as auxiliary equipment in radiological diagnostic and treatment systems, are mainly used to inject a certain amount of contrast agents or other liquids into human blood vessels or other cavities in a short period of time at precisely controlled pressure and flow rate for medical imaging examinations such as CT, MRI, and DSA.

[0003] Currently, in clinical applications, for the vast majority of ordinary patients, contrast agents can be smoothly and safely injected into blood vessels using a high-pressure injector, meeting the needs of imaging examinations. However, it is important to note that there are specific patient groups, such as high-risk patients with diabetes, hypertension, undergoing chemotherapy for tumors, and the elderly. These patients are characterized by small, inelastic, and fragile blood vessels. During high-pressure injection of contrast agents, the blood vessels cannot dilate properly, leading to a further increase in injector pressure, which can easily cause problems such as blood vessel rupture, damage to the vascular endothelium, and contrast agent extravasation.

[0004] Therefore, it is necessary to develop a high-pressure injector that can automatically optimize the injection pressure when the injection pressure reaches the critical high-pressure range. Utility Model Content

[0005] In view of this, the present invention provides a high-pressure injector capable of adjusting the injection pressure in real time to address the technical requirements mentioned in the background art.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] A high-pressure injector capable of real-time adjustment of injection pressure includes a body, a piston rod disposed within the body, and a drive mechanism for controlling the extension and retraction of the piston rod. A syringe is detachably mounted on the body at a position corresponding to the piston rod. Under the drive of the drive mechanism, the piston rod can reciprocate inside the syringe. The key features are: a pressure sensor is installed at the end of the piston rod to monitor the pressure value inside the syringe; and a displacement detection component is disposed within the body to monitor the extension and retraction stroke of the piston rod.

[0008] The machine body integrates a control module, and the drive mechanism, pressure sensor and displacement detection component are all electrically fed back to the control module; when the pressure sensor detects that the pressure inside the syringe reaches a critical value, the control module can first control the piston rod to retract a certain stroke through the drive mechanism, and then control the piston rod to decelerate and advance forward.

[0009] With the above structure, when injecting contrast agents into patients with poor vascular elasticity under high pressure, when the pressure sensor detects that the pressure inside the syringe has reached a critical value, the drive mechanism first controls the piston rod to retract to reduce the pressure inside the syringe, that is, temporarily reduce the injection pressure in the patient's blood vessel. Then the drive mechanism pushes the piston rod forward again inside the syringe. In this way, the injection of contrast agent into the patient's blood vessel can be avoided when the critical pressure is exceeded, thereby preventing vascular rupture, damage to the vascular intima, and extravasation of contrast agent.

[0010] Preferably, the piston rod end is provided with a rubber stopper that can slide with the syringe, and the pressure sensor is embedded in the end face of the rubber stopper. With this structure, the pressure inside the syringe can be detected directly and accurately.

[0011] Preferably, the displacement detection assembly includes a photosensitive sensor and a grid plate fixed inside the body. The grid plate is arranged on one side of the piston rod, and the grid plate has an array of grid holes. The photosensitive sensor is fixedly installed on the side of the piston rod facing the grid plate. During the extension and retraction of the piston rod, the photosensitive sensor can identify the displacement stroke of the piston rod through the grid holes of the grid plate. With the above structure, during the extension and retraction of the piston rod, the photosensitive sensor can obtain displacement information by identifying the grid holes of the grid plate to identify the displacement stroke of the piston rod.

[0012] Preferably, the photosensitive sensor comprises two sets, and the distance between the two sets of photosensitive sensors is an integer multiple of the distance between two adjacent grating holes. By employing the above structure and setting two sets of photosensitive sensors, measurement errors can be effectively reduced, and the accuracy of monitoring the piston rod displacement can be improved.

[0013] Preferably, the drive mechanism includes a motor, a transmission assembly, a lead screw, and a nut sleeve fitted on the lead screw. The transmission assembly transmits power from the motor to the lead screw. The piston rod is fixedly connected to the nut sleeve. With this structure, when the motor operates, it can drive the lead screw to rotate under the transmission action of the transmission assembly. The rotation of the lead screw forces the nut sleeve to move linearly along the lead screw axis.

[0014] Preferably, the photosensitive sensor is located at one radial end of the nut sleeve. With this structure, the displacement of the two sets of photosensitive sensors can represent the displacement of the piston rod.

[0015] Preferably, the nut sleeve is provided with an annular groove, and one end of the piston rod is fixedly engaged in the annular groove. With this structure, the connection between the piston rod and the nut sleeve is more secure.

[0016] Preferably, the control module has a central processing unit, and the photosensitive sensor, pressure sensor, and motor are all electrically connected to the central processing unit. With this structure, the central processing unit can monitor the signals fed back by the photosensitive sensor in real time and quickly process the received signals, thereby precisely controlling the motor's operation.

[0017] Preferably, the device is equipped with an operating interface for controlling the high-pressure injector to perform drug aspiration, air venting, and injection. With this structure, upon receiving a drug aspiration command, the central processing unit immediately sends a precise control signal to the motor, which drives the piston rod to move backward at a set speed to draw the contrast agent into the syringe. Upon receiving an air venting command, the central processing unit coordinates the motor and the photosensitive sensor to push the piston rod at a specific speed and pressure to expel the air from the syringe. Clicking "start" initiates the injection. The central processing unit precisely controls the motor according to pre-set injection pressure, dosage, and other parameters to ensure the contrast agent is injected into the patient in the most suitable state. During the injection, the central processing unit continuously receives pressure signals from the pressure sensor and dynamically adjusts the injection process to ensure the entire injection process is completed smoothly and safely.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] 1. Using the high-pressure injector provided by this utility model, which can adjust the injection pressure in real time, when injecting contrast agents into patients with poor vascular elasticity, when the pressure sensor detects that the internal pressure of the syringe has reached the critical value, the drive mechanism first controls the piston rod to retract to reduce the internal pressure of the syringe, that is, temporarily reduce the injection pressure in the patient's blood vessels. Then the drive mechanism pushes the piston rod forward again in the syringe. In this way, the injection of contrast agents into the patient's blood vessels can be avoided when the critical pressure is exceeded, thereby preventing vascular rupture, damage to the vascular endothelium, and extravasation of contrast agents.

[0020] 2. The high-pressure injector provided by this utility model, which can adjust the injection pressure in real time, allows the piston rod to retract and then move forward again. The drive mechanism can also control the piston rod to move forward at a lower speed to further optimize the patient's vascular dilation adaptation. This can minimize the adverse effects on blood vessels while meeting imaging requirements, thus ensuring the patient's safety.

[0021] 3. By setting up two sets of photosensitive sensors, measurement errors can be effectively reduced, the accuracy of monitoring the piston rod displacement can be improved, and the control module can more accurately control the extension and retraction of the piston rod. Attached Figure Description

[0022] Figure 1 This is a cross-sectional view of a high-pressure injector;

[0023] Figure 2 A three-dimensional sectional view showing the internal structure of a high-pressure injector;

[0024] Figure 3 for Figure 2 A magnified view of a section at point B in the middle;

[0025] Figure 4 A three-dimensional sectional view of a high-pressure injector in use;

[0026] Figure 5 A schematic diagram of the structure of nut sleeve 44 and grid plate 6;

[0027] Figure 6 This is a schematic diagram of the central processing unit control. Detailed Implementation

[0028] The present invention will be further described below with reference to the embodiments and accompanying drawings.

[0029] like Figure 1 and Figure 4 As shown, a high-pressure injector capable of real-time adjustment of injection pressure includes a body 1, within which a piston rod 3 and a drive mechanism 4 for controlling the extension and retraction of the piston rod 3 are provided. A syringe 2 is detachably mounted on the body 1 at the position corresponding to the piston rod 3. Under the drive of the drive mechanism 4, the piston rod 3 can reciprocate inside the syringe 2. A pressure sensor 8 is installed at the end of the piston rod 3, which can monitor the pressure value inside the syringe 2. A displacement detection component A is provided inside the body 1, which can monitor the extension and retraction stroke of the piston rod 3. Furthermore, a control module 5 is integrated inside the body 1, and the drive mechanism 4, pressure sensor 8, and displacement detection component A are all electrically fed back to the control module 5. When the pressure sensor 8 detects that the pressure inside the syringe 2 reaches a critical value, the control module 5 can first control the piston rod 3 to retract a certain stroke through the drive mechanism 4, and then control the piston rod 3 to decelerate and advance forward.

[0030] Based on the above structural design, this embodiment uses coronary angiography as an example to specifically illustrate the principle of this utility model. The injection pressure of the high-pressure injector for coronary angiography is usually between 300 and 500 psi, and the stroke of the piston rod 3 is selected to be 100 mm. For special patients with poor vascular elasticity, 450 psi can be set as the critical high-pressure pressure. During the injection of contrast agent, if the pressure sensor 8 detects that the internal pressure of the syringe 2 reaches 450 psi, the control module 5 sends a reverse signal to the drive mechanism 4. The drive mechanism 4 drives the piston rod 3 to retract 10 mm, causing the internal pressure of the syringe 2 to drop to close to 300 psi. Then, the control module 5 sends a low-speed forward rotation signal to the drive mechanism 4 to control the piston rod 3 to advance again at a speed 30% lower than the normal advancement speed. If the internal pressure of the syringe 2 reaches 450 psi again, the above steps are repeated until all the contrast agent is pushed into the patient's blood vessels.

[0031] The advantages of the above structural design are as follows: 1. When administering high-pressure injection of contrast agents to patients with poor vascular elasticity, when the pressure sensor 8 detects that the internal pressure of the syringe 2 has reached a critical value, the drive mechanism 4 first controls the piston rod 3 to retract, thereby reducing the internal pressure of the syringe 2, which temporarily reduces the injection pressure in the patient's blood vessel. Then, the drive mechanism 4 pushes the piston rod 3 forward again within the syringe 2. This avoids injecting contrast agents into the patient's blood vessel when the critical pressure is exceeded, thus preventing vascular rupture, damage to the vascular endothelium, and contrast agent extravasation. 2. After the piston rod 3 retracts, it moves forward again. The drive mechanism 4 can also control the piston rod 3 to move forward at a lower speed to further optimize the patient's vascular dilation adaptation, thereby minimizing adverse effects on the blood vessel while meeting imaging requirements and ensuring patient safety.

[0032] For example Figure 2 and Figure 4 As shown, a rubber stopper 31 is provided at the end of the piston rod 3. The diameter of the rubber stopper 31 is adapted to the inner diameter of the syringe 2, and the rubber stopper 31 can slide with the syringe 2. In this embodiment, the pressure sensor 8 is embedded in the end face of the rubber stopper 31. This design can directly and accurately detect the pressure inside the syringe 2, providing more accurate pressure information for the control module 5.

[0033] Please refer to Figure 2 and 3The displacement detection component A includes a photosensitive sensor 7 and a grid plate 6 fixed inside the body 1, wherein the grid plate 6 is arranged on one side of the piston rod 3. Grid holes 61 are arrayed along the length of the grid plate 6, and the photosensitive sensor 7 is fixedly installed on the side of the piston rod 3 facing the grid plate 6. In the initial state, the photosensitive sensor 7 faces one of the grid holes 61. During the extension and retraction of the piston rod 3, the photosensitive sensor 7 can acquire displacement information by identifying each grid hole 61 of the grid plate 6, thereby identifying the displacement stroke of the piston rod 3. The array distribution of the grid holes 61 provides a precise reference point for displacement measurement, enabling relatively accurate determination of the positional change of the piston rod 3, thus achieving accurate measurement of the displacement stroke of the piston rod 3. Furthermore, this structural design is relatively simple and has the advantages of being easy to manufacture and install.

[0034] Further, refer to Figure 3 Two sets of photosensitive sensors 7 are provided, and the distance between the two sets of photosensitive sensors 7 is an integer multiple of the distance between two adjacent grid holes 61. That is, in the initial state, the two sets of photosensitive sensors 7 are facing grid holes 61 at different positions. When the piston rod 3 moves, the absolute value of the displacement can be obtained by calculating the displacement information obtained by the two sets of photosensitive sensors 7, thereby achieving more accurate displacement measurement. By setting two sets of photosensitive sensors 7, measurement errors can be effectively reduced, the accuracy of monitoring the displacement stroke of the piston rod 3 can be improved, and the control module 5 can more accurately control the extension and retraction movement of the piston rod 3.

[0035] Reference Figure 2 The drive mechanism 4 includes a motor 41, a transmission assembly 42, a lead screw 43, and a nut sleeve 44 fitted on the lead screw 43. The transmission assembly 42 transmits the power of the motor 41 to the lead screw 43. The end of the piston rod 3 away from the rubber plug 31 is fixedly connected to the nut sleeve 44. When the motor 41 operates, it drives the lead screw 43 to rotate under the transmission action of the transmission assembly 42. The rotation of the lead screw 43 forces the nut sleeve 44 to move linearly along the axial direction of the lead screw 43.

[0036] In this embodiment, the transmission component 42 uses a belt drive to transmit the rotation of the output shaft of the motor 41 to the lead screw 43.

[0037] To ensure a more secure connection between piston rod 3 and nut sleeve 44, refer to Figure 3 The nut sleeve 44 is provided with an annular groove 441, and the end of the piston rod 3 away from the rubber plug 31 is fixedly engaged in the annular groove 441.

[0038] For example Figure 5 As shown, in this embodiment, the photosensitive sensor 7 is disposed at one radial end of the nut sleeve 44, and two sets of photosensitive sensors 7 are arranged vertically at intervals. The displacement of the two sets of photosensitive sensors 7 can represent the displacement of the piston rod 3.

[0039] like Figure 4 and Figure 5 As shown, the control module 5 includes a central processing unit, and the photosensitive sensor 7, pressure sensor 8, and motor 41 are all electrically connected to the central processing unit. The signal from the photosensitive sensor 7 can be fed back to the central processing unit, which can monitor the signal fed back by the photosensitive sensor 7 in real time and quickly process the received signal, thereby accurately controlling the operation of the motor 41.

[0040] In this embodiment, the machine body 1 is equipped with an operating interface for controlling the high-pressure injector to perform drug aspiration, air expulsion, and injection. The operating interface can be a touchscreen or a button panel, and includes options or buttons such as start, drug aspiration, and air expulsion. (See reference...) Figure 6 The central processing unit (CPU) can respond to the operations of medical staff. When a drug aspiration command is received, the CPU immediately sends a precise control signal to the motor 41, which drives the piston rod 3 to move backward at a set speed to draw the contrast agent into the syringe 2. When an air purging command is received, the CPU coordinates the motor 41 and the photosensitive sensor 7 to push the piston rod 3 at a specific speed and pressure to expel the air from the syringe 2. Clicking "start" initiates the injection. The CPU precisely controls the motor 41 according to pre-set injection pressure, dosage, and other parameters to ensure that the contrast agent is injected into the patient in the most suitable state. During the process, the CPU continuously receives pressure signals from the pressure sensor 8 and dynamically adjusts the injection process to ensure that the entire injection process is completed smoothly and safely.

[0041] Finally, it should be noted that the above description is merely a preferred embodiment of the present utility model. Those skilled in the art, under the guidance of the present utility model, can make various similar representations without departing from the spirit and claims of the present utility model, and such modifications all fall within the protection scope of the present utility model.

Claims

1. A high-pressure injector capable of real-time adjustment of injection pressure, comprising a body (1), a piston rod (3) disposed within the body (1), and a drive mechanism (4) for controlling the extension and retraction of the piston rod (3), wherein a syringe (2) is detachably mounted on the body (1) at a position corresponding to the piston rod (3), and the piston rod (3) reciprocates within the syringe (2) under the drive of the drive mechanism (4), characterized in that: A pressure sensor (8) is installed at the end of the piston rod (3) to monitor the pressure value inside the syringe (2); a displacement detection component (A) is provided inside the body (1) to monitor the extension and retraction stroke of the piston rod (3); The body (1) integrates a control module (5). The drive mechanism (4), pressure sensor (8) and displacement detection component (A) are all electrically fed back to the control module (5). When the pressure sensor (8) detects that the pressure inside the syringe (2) reaches a critical value, the control module (5) can first control the piston rod (3) to retract a certain stroke through the drive mechanism (4), and then control the piston rod (3) to decelerate and move forward.

2. The high-pressure injector capable of real-time adjustment of injection pressure according to claim 1, characterized in that: The piston rod (3) has a rubber stopper (31) at its end that can slide with the syringe (2), and the pressure sensor (8) is embedded in the end face of the rubber stopper (31).

3. The high-pressure injector capable of real-time adjustment of injection pressure according to claim 1, characterized in that: The displacement detection component (A) includes a photosensitive sensor (7) and a grid plate (6) fixed inside the body (1). The grid plate (6) is arranged on one side of the piston rod (3). The grid plate (6) has an array of grid holes (61). The photosensitive sensor (7) is fixedly installed on the side of the piston rod (3) facing the grid plate (6). During the extension and retraction of the piston rod (3), the photosensitive sensor (7) can identify the displacement stroke of the piston rod (3) through the grid holes (61) of each of the grid plates (6).

4. The high-pressure injector capable of real-time adjustment of injection pressure according to claim 3, characterized in that: The photosensitive sensor (7) is provided in two sets, and the distance between the two sets of photosensitive sensors (7) is an integer multiple of the distance between two adjacent grating holes (61).

5. The high-pressure injector capable of real-time adjustment of injection pressure according to claim 3, characterized in that: The drive mechanism (4) includes a motor (41), a transmission assembly (42), a lead screw (43), and a nut sleeve (44) sleeved on the lead screw (43). The transmission assembly (42) is used to transmit the power of the motor (41) to the lead screw (43). The piston rod (3) is fixedly connected to the nut sleeve (44).

6. The high-pressure injector capable of real-time adjustment of injection pressure according to claim 5, characterized in that: The photosensitive sensor (7) is disposed at one radial end of the nut sleeve (44).

7. The high-pressure injector capable of real-time adjustment of injection pressure according to claim 5, characterized in that: The nut sleeve (44) is provided with an annular groove (441), and one end of the piston rod (3) is fixedly engaged in the annular groove (441).

8. The high-pressure injector capable of real-time adjustment of injection pressure according to claim 5, characterized in that: The control module (5) has a central processing unit, and the photosensitive sensor (7), pressure sensor (8) and motor (41) are all electrically connected to the central processing unit.

9. The high-pressure injector capable of real-time adjustment of injection pressure according to claim 1, characterized in that: The machine body (1) is provided with an operating interface, which is used to control the high-pressure injector to draw in the drug, expel the gas and inject the drug.

Images