Syringe holder, syringe pump and method of controlling the same

Abstract

The embodiment of the application belongs to the technical field of medical devices, and particularly relates to an injector fixing device, a syringe pump and a control method thereof, and aims to solve the problem that the liquid medicine in the injector is uncontrollably injected into the body in the related art. The injector fixing device comprises a cylinder, a fixing block, a brake, a transmission rod, a compression elastic member and a first driving mechanism; the cylinder is slidable relative to a pump body, and an inner wall of the cylinder is provided with a limiting portion; the fixing block is connected to a first end of the cylinder, and the fixing block is provided with a first accommodating cavity with an opening; the brake is located in the first accommodating cavity; the transmission rod is slidably arranged in the cylinder, and a first end of the transmission rod is connected to the brake; a first end of the compression elastic member is in abutment with the limiting portion, and a second end of the compression elastic member is in abutment with the brake; and the first driving mechanism is connected to a second end of the transmission rod. The injector fixing device can fix the push handle of the injector, and prevent the liquid medicine in the injector from being uncontrollably injected into the body.

Description

Technical Field

[0001] This application belongs to the field of medical device technology, and particularly relates to a syringe fixing device, an injection pump and its control method. Background Technology

[0002] An infusion pump is a medical device used to precisely, minutely, evenly, and continuously inject medication from a syringe into the body. An infusion pump generally consists of a pump body, a pump gate, a syringe holder, and a pusher. An installation space is formed between the pump body and the pump gate for mounting the syringe. The syringe holder connects to the pump body and secures the syringe after it is installed in the installation space, ensuring precise positioning. Then, the pusher engages with the syringe plunger to inject the medication. However, during the securing and engaging process, the medication can be injected uncontrollably into the body, reducing the accuracy of the injection. Summary of the Invention

[0003] In view of this, embodiments of this application provide a syringe fixing device, an injection pump, and a control method thereof to solve the technical problem that the liquid medicine in the syringe will be injected into the body uncontrollably during the process of fixing and locking the syringe.

[0004] A first aspect of this application provides a syringe fixing device for fixing a syringe placed in a pump body, comprising a barrel, a fixing block, a braking element, a transmission rod, a compression elastic element, and a first driving mechanism; the barrel is connected to the pump body and is slidable relative to the pump body, and a limiting portion is provided on the inner wall of the barrel; the fixing block is connected to a first end of the barrel away from the pump body and abuts against the syringe barrel, and a first receiving cavity communicating with the barrel is provided in the fixing block, the first receiving cavity having an opening facing the syringe; the braking element is located in the first receiving cavity, and the braking element has a braking portion opposite to the opening; the transmission rod is slidably disposed in the barrel, and a first end of the transmission rod extends into the first receiving cavity and is connected to the braking element; the compression elastic element is located in the communicating first receiving cavity and the barrel, abutting against the limiting portion at a first end, and abutting against the braking element at a second end; the first driving mechanism is connected to the second end of the transmission rod to drive the transmission rod to slide relative to the barrel;

[0005] When the syringe fixing device is in the first fixed state, the first driving mechanism drives the transmission rod to move the braking member toward the syringe, the braking member compresses the compression elastic member, and the compression elastic member pushes the cylinder and the fixing block toward the syringe through the limiting part, and the fixing block abuts against the syringe barrel; when the syringe fixing device is in the second fixed state, the first driving mechanism continues to drive the transmission rod to move the braking member toward the syringe, and the braking part of the braking member extends from the opening and abuts against the syringe push handle.

[0006] The syringe fixing device of this application embodiment, after the syringe is placed in the pump body, can control the first drive mechanism to operate, so that the syringe fixing device is in a first fixed state, that is, the fixing block of the syringe fixing device abuts against the syringe barrel to fix the syringe barrel. Continuing to control the first drive mechanism to operate, the syringe fixing device is in a second fixed state, that is, the braking part of the brake pad of the syringe fixing device abuts against the syringe plunger to fix the syringe plunger. Therefore, during the process of fixing the syringe, during the subsequent locking of the syringe plunger, in cases of negative pressure inside the syringe, accidental contact of the syringe plunger, or when the injection pump malfunctions, the syringe plunger can be prevented from moving relative to the syringe barrel, thereby preventing the uncontrolled injection of medication into the body, improving the medication injection accuracy and safety performance of the injection pump.

[0007] In some possible implementations, the transmission rod has a transmission thread on its outer side near its second end; the first drive mechanism includes a drive motor and a transmission nut, the drive motor is mounted on the pump body, the output shaft of the drive motor is connected to the transmission nut to drive the transmission nut to rotate, and the transmission nut is sleeved on the transmission thread.

[0008] In some possible implementations, the first drive mechanism further includes a transmission assembly that connects the drive motor and the transmission nut.

[0009] In some possible implementations, the transmission nut is rotatably connected to the pump body about the axis of the transmission nut, and transmission teeth are provided on the outer side of the transmission nut; the transmission assembly includes at least one transmission gear, which is sleeved on the output shaft of the drive motor and meshes with the transmission teeth.

[0010] In some possible implementations, the braking component further includes a connecting portion, the first end of which is connected to the first end of the transmission rod, the second end of which is connected to the braking component, and the connecting portion abuts against the fixing block.

[0011] In some possible implementations, the connecting part is an arc-shaped structure that bends away from the pump body.

[0012] In some possible implementations, the fixing block includes a first fixing part and a second fixing part connected to each other. The first fixing part is connected to the end of the cylinder away from the pump body. The side of the first fixing part facing away from the cylinder body is provided with a first receiving groove, and the bottom of the first receiving groove is provided with the opening. The second fixing part is located on the side of the first fixing part facing away from the cylinder body. The side of the second fixing part facing the first fixing part is provided with a second receiving groove. The second receiving groove and the first receiving groove surround the first receiving cavity.

[0013] In some possible implementations, the first fixing part includes a first sub-fixing part and a second sub-fixing part arranged radially along and connected to the cylinder body; a portion of the second sub-fixing part protrudes from the end face of the first sub-fixing part facing the pump body, and the portion of the second sub-fixing part protruding from the first sub-fixing part forms a crimping groove with the first sub-fixing part, the crimping groove being used to engage with the flange of the syringe; the opening is provided in the second sub-fixing part and is located on the side of the crimping groove facing away from the pump body.

[0014] In some possible implementations, the syringe fixing device further includes a guide ring installed in the connecting through hole of the pump body, and a guide groove is provided on the inner side of the guide ring; the barrel is inserted into the guide ring, and a guide protrusion is provided on the outer side of the barrel near its second end, and the guide protrusion slides in the guide groove.

[0015] In some possible implementations, the guide groove includes a connected straight groove segment and a spiral groove segment, the straight groove segment extending parallel to the axis of the guide ring, the straight groove segment forming a guide inlet at the second end of the cylinder; the spiral groove segment is closer to the fixing block than the straight groove segment, and the spiral groove segment extends around the axis of the guide ring.

[0016] In some possible implementations, the side of the cylinder near its second end is provided with a mounting groove, which forms a mounting opening at the second end of the cylinder; a connecting cylinder is provided at the second end of the cylinder, the radius of which is smaller than the radius of the cylinder; the syringe fixing device further includes a first mounting bracket, which includes a first mounting ring and a first connecting arm, the first mounting ring being sleeved on the connecting arm; the first connecting arm is arranged axially along the first mounting ring and connected to the first mounting ring, and is installed in the mounting groove; a guide protrusion is provided on the side of the first connecting arm facing away from the mounting groove.

[0017] In some possible implementations, the syringe fixing device further includes a specification sensor connected to the barrel and located near a second end of the barrel, the specification sensor being used to identify the specification of the syringe.

[0018] In some possible implementations, the syringe fixing device further includes a second mounting bracket, which includes a second mounting ring and a second connecting arm. The second mounting ring is sleeved on the connecting cylinder and abuts against the first mounting ring. The second connecting arm is arranged axially along the second mounting ring, with a first end connected to the second mounting ring and a second end used to mount the specification sensor.

[0019] In some possible implementations, the outer side of the connecting tube is provided with a snap-fit ​​groove, which is located on the side of the second mounting ring opposite to the first mounting ring; the syringe fixing device also includes a shaft retaining ring, which is snapped into the snap-fit ​​groove.

[0020] In some possible implementations, a wave-shaped gasket is provided between the first mounting ring and the second mounting ring, the wave-shaped gasket being sleeved on the connecting cylinder and abutting against the first mounting ring and the second mounting ring respectively.

[0021] In some possible implementations, the cylinder includes a first cylinder and a second cylinder, the first cylinder being slidable relative to the pump body; a first end of the second cylinder is sleeved on the first end of the first cylinder away from the pump body and is fixedly connected to the first cylinder for the transmission rod to pass through; the first end of the first cylinder is the limiting part, and the second end of the second cylinder is connected to the fixing block.

[0022] A second aspect of this application provides an injection pump, including a pump body, a pusher, and a syringe fixing device as described in any of the preceding claims; the pump body has a second receiving space for accommodating a syringe; the pusher is connected to the pump body and is configured to engage with the plunger of the syringe to drive the plunger to slide relative to the syringe barrel.

[0023] The injection pump of this application embodiment includes the syringe fixing device described in any of the above claims. Therefore, the injection pump also has the advantages of the syringe fixing device described in any of the above claims, which will not be repeated here.

[0024] A third aspect of this application provides a method for controlling an infusion pump, the method being applied to the infusion pump described above, the method comprising:

[0025] A first control signal is generated and transmitted to the first drive mechanism of the syringe fixing device, wherein the first control signal indicates that the syringe is installed in place;

[0026] A second control signal is generated and transmitted to the pushing device, the second control signal instructing the pushing device to engage with the plunger of the syringe;

[0027] A third control signal is generated and transmitted to the first drive mechanism, the third control signal instructing the braking part to disengage from the syringe plunger.

[0028] The control method for the injection pump in this embodiment allows for the following steps after the syringe is placed in the pump body: First, a first drive mechanism is activated to position the syringe fixing device in a first state, whereby the fixing block of the syringe fixing device abuts against the syringe barrel to secure it. Continuing to activate the first drive mechanism, the syringe fixing device is then positioned in a second state, where the braking portion of the braking plate of the syringe fixing device abuts against the syringe plunger to secure it. This prevents movement of the syringe plunger relative to the syringe barrel during syringe fixing, subsequent insertion of the plunger, and accidental contact with the plunger. Consequently, uncontrolled injection of medication into the body is prevented, improving the injection accuracy and safety of the injection pump.

[0029] In some possible implementations, the injection pump further includes an in-situ sensor; the generation of the first control signal includes:

[0030] Receive a first operation on the first target key; generate the first control signal in response to the first operation;

[0031] Alternatively, upon receiving the presence signal generated by the presence sensor, the first control signal is generated based on the presence signal.

[0032] In some possible implementations, the actuating device includes a actuating portion that engages with the syringe; prior to generating the first control signal, the method further includes:

[0033] The injection pump is turned on, generating a first open signal;

[0034] Alternatively, the injection pump is turned on, receives a second operation on the second target button, and generates a first open signal in response to the second operation; wherein the first open signal controls the pusher to move away from the pump body. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. It is obvious that the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a first-view perspective three-dimensional structural diagram of the injection pump according to the first embodiment of this application;

[0037] Figure 2 for Figure 1 A schematic diagram of the overall structure of a syringe pump when the pump door is open;

[0038] Figure 3 for Figure 2 A three-dimensional structural diagram of the syringe fixing device in the open state (concealing the second housing and door);

[0039] Figure 4 for Figure 2 A schematic diagram of the syringe fixing device in its first fixed state;

[0040] Figure 5 for Figure 2 A schematic diagram of the syringe fixing device with the syringe placed in the middle when it is in the first fixed state;

[0041] Figure 6 for Figure 2 A schematic diagram of the syringe fixing device in the second fixed state;

[0042] Figure 7 for Figure 2 A second-view three-dimensional structural diagram of the syringe fixing device;

[0043] Figure 8 for Figure 7 A partial explosion diagram of the syringe fixing device;

[0044] Figure 9 for Figure 2 A third-view perspective three-dimensional structural diagram of the syringe fixing device;

[0045] Figure 10 for Figure 2 An exploded structural diagram of the syringe fixing device (concealing the first drive mechanism);

[0046] Figure 11 for Figure 10 A cross-sectional structural diagram of the syringe fixing device;

[0047] Figure 12A front view structural diagram of the syringe fixing device (with the first drive mechanism hidden);

[0048] Figure 13 for Figure 12 A schematic diagram of the syringe fixing device in its first fixed state;

[0049] Figure 14 for Figure 13 A cross-sectional structural diagram of the syringe fixing device;

[0050] Figure 15 for Figure 12 A schematic diagram of the syringe fixing device in the second fixed state;

[0051] Figure 16 for Figure 15 A cross-sectional structural diagram of the syringe fixing device;

[0052] Figure 17 for Figure 2 A schematic diagram of the structure of the first shell in the middle;

[0053] Figure 18 for Figure 17 A partial cross-sectional structural diagram of the first shell in the middle;

[0054] Figure 19 for Figure 17 A structural schematic diagram of the first shell (hidden bottom plate) from a fourth perspective;

[0055] Figure 20 for Figure 19 A magnified view of a portion of point A in the middle;

[0056] Figure 21 for Figure 20 A schematic diagram of the fifth-view structure of the guide ring;

[0057] Figure 22 for Figure 20 A schematic diagram of the sixth-view structure of the guide ring;

[0058] Figure 23 for Figure 2 A schematic diagram of the seventh-perspective structure of the central propulsion unit;

[0059] Figure 24 This is a schematic flowchart of the control method for the injection pump according to the second embodiment of this application;

[0060] Figure 25 This is a schematic flowchart of the control method for the injection pump according to the third embodiment of this application;

[0061] Figure 26 This is a schematic flowchart of the control method for the injection pump according to the fourth embodiment of this application;

[0062] Figure 27 This is a flowchart illustrating the control method of the injection pump in some possible implementations of the fifth embodiment of this application;

[0063] Figure 28 This is a flowchart illustrating the control method of the injection pump in some other possible implementations of the fifth embodiment of this application;

[0064] Figure 29 This is a schematic flowchart of the control method for the injection pump according to the sixth embodiment of this application;

[0065] Figure 30 This is a schematic flowchart of the control method for the injection pump according to the seventh embodiment of this application.

[0066] Explanation of reference numerals in the attached figures:

[0067] 10-Pump body;

[0068] 110 - First housing; 111 - Second receiving cavity;

[0069] 112 - Third receiving cavity; 113 - Fourth receiving cavity;

[0070] 114 - Separator; 115 - Rotating connection;

[0071] 116 - First rotating through hole; 117 - Connecting through hole;

[0072] 118 - Sliding through hole; 120 - Second housing;

[0073] 121 - First button; 130 - Door body;

[0074] 131 - Display screen; 132 - Second button;

[0075] 20 - Syringe fixing device;

[0076] 210 - Cylinder body; 201 - Limiting part;

[0077] 211 - First cylinder; 212 - Second cylinder;

[0078] 213 - Guide protrusion; 214 - Mounting groove;

[0079] 215 - Connecting cylinder; 216 - First mounting ring;

[0080] 217 - First connecting arm; 218 - Snap-fit ​​slot;

[0081] 219 - Shaft retaining ring; 220 - Fixing block;

[0082] 221 - First receiving cavity; 222 - Opening;

[0083] 223 - First fixing part; 224 - Second fixing part;

[0084] 225 - First receiving groove; 226 - First sub-fixing part;

[0085] 227 - Second sub-fixing part; 228 - Snap-fit ​​groove;

[0086] 229 - Second receiving groove; 230 - Braking component;

[0087] 231-Brake part; 232-Connecting part;

[0088] 240 - Drive rod; 241 - Sealing ring;

[0089] 250 - Compression elastic element; 260 - First drive mechanism;

[0090] 261 - Drive motor; 262 - Transmission nut;

[0091] 263 - Mounting base; 264 - Transmission gear;

[0092] 265 - Transmission gear; 270 - Guide ring;

[0093] 271 - Guide groove; 272 - Straight groove section;

[0094] 273 - Spiral groove section; 280 - Second mounting bracket;

[0095] 281 - Second mounting ring; 282 - Second connecting arm;

[0096] 283 - Waveform gasket; 290 - Clip;

[0097] 30 - Propulsion device;

[0098] 310 - Push rod; 320 - Push unit;

[0099] 321 - Pressure sensor; 322 - Clamping jaw;

[0100] 330 - Second drive mechanism;

[0101] 40 - Syringe;

[0102] 410 - Syringe; 420 - Push handle. Detailed Implementation

[0103] To address the technical problem in related technologies where the medication inside the syringe is uncontrollably injected into the body during the fixing and locking process of the syringe, the syringe fixing device of this application embodiment includes a fixing block, a braking component, and a first driving mechanism. The fixing block has a first receiving cavity with an opening, and the braking component is located within the first receiving cavity. The braking component has a braking part that can extend through the opening. The first driving mechanism connects the fixing block and the braking component. When the syringe fixing device is in a first fixed state, the first driving mechanism drives the fixing block to abut against the syringe barrel to fix the syringe barrel. When the syringe fixing device is in a second fixed state, the first driving mechanism continues to drive the braking component to move relative to the fixing block toward the syringe, so that the braking part of the braking component extends from the opening and abuts against the syringe plunger, thereby braking the syringe plunger. This prevents the plunger from moving during the fixing and locking process of the syringe, in cases of negative pressure inside the syringe, or accidental contact of the syringe plunger. Furthermore, it fixes the plunger when the injection pump malfunctions, thereby preventing the medication inside the syringe from being uncontrollably injected into the body and ensuring the accuracy of medication injection.

[0104] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0105] refer to Figure 1 and Figure 2 The first embodiment of this application provides an injection pump, including a pump body 10, a syringe fixing device 20, and a pushing device 30. Both the syringe fixing device 20 and the pushing device 30 are connected to the pump body 10. The syringe fixing device 20 is used to fix the syringe installed inside the pump body 10. The pushing device 30 is used to engage with the plunger of the syringe and to push the plunger to move relative to the syringe barrel, thereby injecting the drug solution in the syringe into the body.

[0106] For example, refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 The pump body 10 may include a first housing 110, a second housing 120, and a door 130 disposed opposite to each other. The first housing 110 and the second housing 120 are disposed opposite to each other and connected to each other. A base plate may be connected to the side of the first housing 110 facing away from the second housing 120. The first housing 110 and the second housing 120 may form a second receiving cavity 111, which can be used to place a syringe.

[0107] For example, a presence sensor may be provided within the second receiving cavity 111 to detect whether the syringe 40 is properly installed. If the syringe 40 is installed, the presence sensor sends a presence signal. If the syringe 40 is not installed, the presence sensor will not send a presence signal, or will send a non-installation signal. For example, the presence sensor may be a switch; an open switch indicates that the syringe is installed, and a closed switch indicates that the syringe is not installed. For example, the switch may be an optocoupler switch or a tactile switch.

[0108] In some possible implementations of the first embodiment of this application, the second housing 120 may also be provided with a first button 121. Exemplarily, the first button 121 may be a press-type button or a rotary button. Exemplarily, after the syringe 40 is placed in the second receiving cavity 111, the operator can operate the first button 121 to confirm that the syringe 40 is in place, for example, by pressing the first button 121 or rotating the first button 122. It is understood that the operator's operation of the first button 121 can also trigger other actions besides confirming that the syringe 40 is in place; these will not be elaborated further in the first embodiment of this application.

[0109] refer to Figure 3 and Figure 4 The first housing 110 and the second housing 120 may also be configured to form a third receiving cavity 112, which is spaced apart from the second receiving cavity 111. The third receiving cavity 112 is used to receive part of the syringe fixing device 20. For example, the third receiving cavity 112 may receive the first drive mechanism 260 of the syringe fixing device 20.

[0110] Exemplarily, the first housing 110 and the second housing 120 may also be configured to form a fourth receiving cavity 113, which is spaced apart from the second receiving cavity 111. Exemplarily, the pump body 10 also includes a partition 114, with the second receiving cavity 111 located on one side of the partition 114, and the third receiving cavity 112 and the fourth receiving cavity 113 located on the other side of the partition 114. The fourth receiving cavity 113 is used to receive part of the actuating device 30. For example, the fourth receiving cavity 113 may receive the second drive mechanism 330 of the actuating device 30.

[0111] The first housing 110 is also connected to a door 130, which is used to close or open the second receiving cavity 111. Exemplarily, one side of the door 130 can be rotatably connected to the first housing 110, and the second receiving cavity 111 can be closed or opened by rotating the door 130. For example, refer to... Figure 3 and Figure 4The first housing 110 may be provided with a rotatable connecting portion 115. The rotatable connecting portion 115 is provided with a first rotatable through hole 116. A second rotatable through hole is provided on one side of the door body 130, and the second rotatable through hole is opposite to the first rotatable through hole 116. A rotating shaft may be inserted into the opposite first rotatable through hole 116 and second rotatable through hole. The first housing 110 and the door body 130 are rotatably connected by the rotating shaft.

[0112] For example, the syringe fixing device 20 may further include a door status sensor, which may be mounted on the first housing 110 or the door 130, or on the second housing 120. The door status sensor is used to detect the status of the door 130. When the door 130 is in the closed state, the door status sensor sends a closing signal. When the door 130 is in the open state, the door status sensor does not send a closing signal, or sends an opening signal. For example, the door status sensor may be a proximity switch, an infrared photocell, etc.

[0113] Exemplarily, a display screen 131 may also be installed on the door 130. The display screen 131 is used to display relevant information about the infusion pump, such as the pump's operating status, the type of injected medication, flow rate, and injection duration. The display screen 131 can also be used to display other information, which will not be elaborated further in the first embodiment of this application. Exemplarily, the display screen 131 may have a touch function, allowing the infusion pump to be controlled via touch.

[0114] At least one second button 132 may also be provided on the door body 130. The second button 132 may be installed on the side of the door body 130 where the display screen 131 is provided, or it may be installed on the side of the door body 130. Exemplarily, the second button 132 may be a push-button or a rotary button. Exemplarily, an operator may operate the second button 132, for example, by pressing the second button 132 or rotating the second button 132, to open the door body 130. It is understood that operating the second button 132 may also trigger other actions besides opening the door body 130, which will not be described in detail in the first embodiment of this application.

[0115] For example, the pump body 10 may also include an alarm light that illuminates when the injection pump is in an abnormal state, etc., to provide an alarm.

[0116] The syringe retainer 20 is connected to the pump body 10 and is used to secure the syringe placed inside the pump body 10. The syringe retainer 20 has an open state, a first secured state, and a second secured state. (Reference) Figure 3 When the syringe retainer 20 is in the open position, a portion of the syringe retainer 20 is moved away from the pump body 10 to facilitate placement of the syringe within the pump body 10. (Reference) Figure 4 and Figure 5 When the syringe fixing device 30 is in the first fixed state, the syringe fixing device 20 fixes the syringe barrel 410 of the syringe 40 to prevent the syringe barrel 410 from moving. (Reference) Figure 6 When the syringe fixing device 30 is in the second fixed state, the syringe fixing device 20 fixes the plunger 420 of the syringe 40 to prevent the plunger 420 of the syringe 40 from moving relative to the syringe barrel 410 during the subsequent locking process of the plunger 420 of the syringe 40, in case of negative pressure inside the syringe 40, or accidental contact of the plunger 420 of the syringe 40, thereby preventing the liquid medicine in the syringe 40 from being injected into the body uncontrollably, thus improving the liquid medicine injection accuracy and safety performance of the injection pump.

[0117] refer to Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11 and Figure 12 The syringe fixing device 20, used to fix the syringe 40 placed inside the pump body 10, may include a barrel 210, a fixing block 220, a braking element 230, a transmission rod 240, a compression elastic element 250, and a first drive mechanism 260. The barrel 210 is connected to the pump body 10 and is slidable relative to the pump body 10. A limiting part 201 is provided on the inner wall of the barrel 210. The fixing block 220 is connected to the first end of the barrel 210 away from the pump body 10 and is used to abut against the syringe barrel 410 of the syringe 40. A first receiving cavity 221 communicating with the barrel 210 is provided in the fixing block 220. The first receiving cavity 221 has an opening 222 facing the syringe 40. The braking element 230 is located in the first receiving cavity 221 and has a braking part 231 opposite to the opening 222. The transmission rod 240 is slidably disposed within the cylinder 210, with its first end extending into the first receiving cavity 210 and connecting to the brake member 230. A compression elastic member 250 is located within the connected first receiving cavity 210 and cylinder 210, with its first end abutting against the limiting portion 201 and its second end abutting against the brake member 230. A first driving mechanism 260 is connected to the second end of the transmission rod 240 to drive the transmission rod 240 to slide relative to the cylinder 210.

[0118] For example, after the syringe pump is turned on, the syringe retainer 20 can be in the open state to facilitate the placement of the syringe 40. When the syringe retainer 20 is in the open state, the first drive mechanism 260 drives the transmission rod 240 to slide relative to the cylinder 210 away from the pump body 10. The transmission rod 240 drives the brake 230 to slide relative to the cylinder 210 away from the pump body 10. The brake 230 abuts against the fixing block 220 to apply a pushing force to the fixing block 220, causing the fixing block 220 and the cylinder 210 connected to the fixing block 220 to slide relative to the pump body 10 away from the pump body 10, thereby moving the fixing block 220 away from the first receiving cavity 221, so that the syringe 40 can be placed in the first receiving cavity 221.

[0119] refer to Figure 13 and Figure 14 After the syringe 40 is placed inside the pump body 10, the syringe fixing device 20 can be in a first fixed state and a second fixed state. When the syringe fixing device 20 is in the first fixed state, the first drive mechanism 260 drives the transmission rod 240 to cause the brake member 230 to slide towards the syringe 40. The brake member 230 compresses the elastic member 250, and the compressed elastic member 250 pushes the cylinder 210 and the fixing block 220 towards the syringe 40 through the limiting part 201. The fixing block 220 abuts against the syringe barrel 410 of the syringe 40. (Reference) Figure 15 and Figure 16 When the syringe fixing device 20 is in the second fixed state, the first drive mechanism 260 continues to drive the transmission rod 240 to drive the brake 230 to slide toward the syringe 40, and the brake part 231 of the brake 230 extends out from the opening 222 and abuts against the push handle 420 of the syringe 40.

[0120] The syringe fixing device 20 of the first embodiment of this application can control the first drive mechanism 260 to operate after the syringe 40 is placed in the pump body 10, so that the syringe fixing device 20 is in a first fixed state, that is, the fixing block 220 of the syringe fixing device 20 abuts against the syringe barrel 410 of the syringe 40 to fix the syringe barrel 410 of the syringe 40. The first drive mechanism 260 is controlled to continue operating, so that the syringe fixing device 20 is in the second fixed state, that is, the braking part 231 of the braking member 230 abuts against the plunger 420 of the syringe 40 to fix the plunger 420 of the syringe 40. Thus, during the process of fixing the syringe 40, in the subsequent process of locking the plunger 420 of the syringe 40, in the case of negative pressure inside the syringe 40, or accidental contact of the plunger 420 of the syringe 40, the plunger 420 of the syringe 40 can be prevented from moving relative to the syringe 410. In addition, when the injection pump malfunctions, the plunger 420 is fixed, thereby preventing the liquid in the syringe 40 from being injected into the body uncontrollably, thus improving the liquid injection accuracy and safety performance of the injection pump.

[0121] In some possible implementations of the first embodiment of this application, the cylindrical body 210 can be a split structure. For example, refer to... Figures 7 to 16 The cylinder 210 may include a first cylinder 211 and a second cylinder 212. The first cylinder 211 is slidable relative to the pump body 10. The first end of the second cylinder 212 is sleeved on the first end of the first cylinder 211 away from the pump body 10 and is fixedly connected to the first cylinder 211 for the transmission rod 240 to pass through. The first end of the first cylinder 211 is a limiting part 201, and the second end of the second cylinder 212 is connected to the fixing block 220. Since one end of the first cylinder 211 extends into the interior of the second cylinder 212, directly forming the limiting part 201, it is not necessary to make the limiting part 201 inside the second cylinder 212, which reduces the difficulty of making the limiting part 201 inside the cylinder 210, thereby reducing the processing difficulty of the cylinder 210.

[0122] In some other possible implementations of the first embodiment of this application, the cylinder 210 may also be a one-piece structure. Exemplarily, the cylinder 210 may include a third cylinder, which is slidable relative to the pump body 10, and a fixing block 220 is connected to the end of the third cylinder away from the pump body 10. A protrusion protruding towards the centerline of the third cylinder is formed within the third cylinder; the protrusion is a limiting portion 201. The one-piece structure of the cylinder 210 reduces the number of parts in the syringe fixing device 20, thereby improving the convenience of assembling and adjusting the syringe fixing device 20.

[0123] One end of the cylinder 210 away from the pump body 10 is connected to the fixing block 220. Exemplarily, the fixing block 220 may include a first fixing part 223 and a second fixing part 224 connected together. The first fixing part 223 is connected to the end of the cylinder 210 away from the pump body 10; for example, the first fixing part 223 may be connected to the second end of the second cylinder 212. A first receiving groove 225 is provided on the side of the first fixing part 223 away from the cylinder 210, and an opening 222 is provided at the bottom of the first receiving groove 225. The second fixing part 224 is located on the side of the first fixing part 223 away from the cylinder 210, and a second receiving groove 229 is provided on the side of the second fixing part 224 facing the first fixing part 223. The second receiving groove 229 and the first receiving groove 225 together form a first receiving cavity 221.

[0124] During the assembly of the syringe fixing device 20, the braking component 230, transmission rod 240, and compression elastic component 250 can be first installed in the cylinder 210 and the first receiving groove 225. Then, the second receiving groove 229 of the second fixing part 224 is aligned with the first receiving groove 225 to form a receiving cavity 221. Finally, the second fixing part 224 and the first fixing part 223 are connected by connecting bolts or other means. By setting the fixing block 220 to include the connected first fixing part 223 and the second fixing part 224, that is, setting the fixing block 220 as a split structure, the convenience of assembling other components in the syringe fixing device 20 can be improved.

[0125] For example, the first fixing part 223 and the cylinder 210 can be an integral structure. For instance, the first fixing part 223 can be an integral structure with the second cylinder 212. This configuration can increase the connection strength between the first fixing part 223 and the cylinder 210, prevent the first fixing part 223 from detaching from the cylinder 210, and improve the structural reliability of the syringe fixing device 20.

[0126] Exemplarily, the first fixing part 223 may include a first sub-fixing part 226 and a second sub-fixing part 227 disposed radially and connected to the syringe body 210. A portion of the second sub-fixing part 227 protrudes from the end face of the first sub-fixing part 226 facing the pump body 10. The portion of the second sub-fixing part 227 protruding from the first sub-fixing part 226 forms a crimping groove 228 with the first sub-fixing part 226. The crimping groove 228 is used to engage with the flange of the syringe 410. When the fixing part 226 abuts against the syringe 410, the crimping groove 228 engages with the flange of the syringe 410, causing the first sub-fixing part 226 to abut against the outer surface of the syringe 410, and the second sub-fixing part 227 to abut against the flange of the syringe 410. This increases the contact area between the fixing part 226 and the syringe 410, thereby improving the fixing performance of the fixing part 226 on the syringe 40. An opening 222 is provided on the second sub-fixing part 227 and is located on the side of the crimping groove 228 facing away from the pump body 10. When the crimping groove 228 is engaged with the flange of the syringe 410, the opening 222 is opposite to the push handle 420 of the syringe 40, so that the braking part 231 of the braking member 230 can extend from the opening 222 and abut against the push handle 420.

[0127] The braking element 230 is located within the first receiving cavity 221. When the syringe fixing device 20 is in the open state and the first fixed state, the braking element 230 is housed within the first receiving cavity 221 and abuts against the fixing block 220. When the syringe fixing device 20 is in the second fixed state, the braking element 230 moves relative to the fixing block 220 and the barrel 210, so that the braking part 231 of the braking element 230 extends out from the opening 222 and abuts against the push handle 420.

[0128] For example, refer to Figure 8 and Figure 10 The braking component 230 may further include a connecting portion 232. The first end of the connecting portion 232 is connected to the first end of the transmission rod 240, and the second end of the connecting portion 232 is connected to the braking component 231. The connecting portion 232 is used to abut against the fixing block 220. By providing the connecting portion 232, the contact area between the braking component 230 and the fixing block 220 can be increased. When the syringe fixing device 20 switches to the open state, the braking component 230 can apply a large thrust to the fixing block 220, thereby allowing the fixing block 220 to move away from the pump body 10 along with the braking component 230, preventing the fixing block 220 from obstructing the syringe 40.

[0129] For example, the connecting portion 232 can be an arc-shaped structure, which bends away from the pump body 10. By setting the connecting portion 232 as an arc-shaped structure, the contact area between the brake member 230 and the fixed block 220 can be further increased when the fixed block 220 provides a limited area of ​​accommodating space, thereby further increasing the thrust that the brake member 230 can apply to the fixed block 220.

[0130] For example, the connecting portion 232 and the braking portion 231 can be an integral structure. For instance, the connecting portion 232 and the braking portion 231 can be integrally formed by casting. The integral structure of the connecting portion 232 and the braking portion 231 has greater connection strength and can prevent the connecting portion 232 and the braking portion 231 from separating from each other, thereby improving the structural reliability of the braking component 230.

[0131] The transmission rod 240 is slidably disposed within the cylinder 210, with its first end extending into the first receiving cavity 221 and connecting to the brake member 230. Exemplarily, a sealing ring 241 may be fitted onto the outer side of the transmission rod 240, abutting against the inner wall of the first cylinder 211, allowing the transmission rod 240 to be slidably connected to the first cylinder 211 via the sealing ring 241. The first end of the transmission rod 240 extends into the first receiving cavity 221 to connect with the brake member 230. Exemplarily, a connecting hole may be provided on the connecting portion 232 of the brake member 230, through which the first end of the transmission rod 240 can be fitted. The second end of the transmission rod 240 is connected to the first driving mechanism 260, allowing the transmission rod 240 to slide relative to the cylinder 210 under the drive of the first driving mechanism 260.

[0132] The syringe fixing device 20 may also be provided with a compression elastic element 250, which may be located within the connected first receiving cavity 221 and the barrel 210. The first end of the compression elastic element 250 abuts against the limiting part 201, and the second end of the compression elastic element 250 abuts against the braking member 230. When the first driving mechanism 260 drives the transmission rod 240 and the braking member 230 to slide relative to the barrel 210 toward the pump body 10, the braking member 230 compresses the compression elastic element 250, causing the compression elastic element 250 to deform and apply a restoring force to the barrel 210 through the limiting part 201, thereby causing the barrel 210 to drive the fixing block 220 to slide relative to the pump body 10, so that the fixing block 220 abuts against the syringe 410.

[0133] For example, the compression elastic element 250 can be a compression spring, which is sleeved on the transmission rod 240. The first end of the compression spring abuts against the limiting portion 201, and the second end of the compression spring abuts against the braking element 230. It is understood that the compression elastic element 250 can also be annular rubber, or other elastic elements that can be compressed and provide restoring force, which will not be described in detail in the first embodiment of this application.

[0134] The first drive mechanism 260 may be located inside the pump body 10. For example, the drive motor 261 may be installed inside the third receiving cavity 112, and the second end of the transmission rod 240 is connected to the first drive mechanism 260. Exemplarily, the transmission rod 240 has a transmission thread on its outer side near its second end. The first drive mechanism 260 may include a drive motor 261 and a transmission nut 262. The drive motor 261 is mounted on the pump body 10, and the output shaft of the drive motor 261 is connected to the transmission nut 262 to drive the transmission nut 262 to rotate. The transmission nut 262 is fitted onto the transmission thread. When the output shaft of the drive motor 261 rotates, it drives the transmission nut 262 to rotate. Since the transmission rod 240 is slidably connected to the cylinder 210, the transmission nut 262 drives the transmission rod 240 to slide relative to the cylinder 210 through its external thread.

[0135] For example, the first drive mechanism 260 may further include a transmission assembly connecting the drive motor 261 and the transmission nut 262. The transmission assembly can be used to adjust the transmission ratio between the drive motor 261 and the transmission nut 262. Furthermore, the relative position between the transmission nut 262 and the drive motor 261 can be adjusted by setting the transmission assembly, thereby optimizing the structure of the first drive mechanism 260 and facilitating the miniaturization of the syringe fixing device 20.

[0136] Exemplarily, the transmission nut 262 can be rotatably connected to the pump body 10 about its axis. For example, the pump body 10 can be connected to a mounting base 263, and the transmission nut 262 can be rotatably connected to the mounting base 263. A transmission tooth 264 can be provided on the outer side of the transmission nut 262. The transmission assembly can include at least one transmission gear 265, which is sleeved on the output shaft of the drive motor 261 and meshes with the transmission tooth 264. When the output shaft of the drive motor 261 rotates, the output shaft of the drive motor 261 can drive at least one transmission gear 265 to rotate, and the at least one transmission gear 265 drives the transmission nut 262 to rotate via the transmission tooth 264.

[0137] In some possible implementations of the first embodiment of this application, the transmission assembly may also include a synchronous pulley and a synchronous belt. The synchronous pulley is sleeved on the output shaft of the drive motor 261. The synchronous belt surrounds the synchronous pulley and the transmission nut 262, and the synchronous belt abuts against the outer surface of the synchronous pulley and the outer surface of the transmission nut 262. When the output shaft of the drive motor 261 rotates, the output shaft of the drive motor 261 drives the synchronous pulley to rotate, and the synchronous pulley drives the transmission nut 262 to rotate via the synchronous belt.

[0138] It is understood that the transmission component can also be other forms of transmission mechanism, which will not be described in detail in the first embodiment of this application.

[0139] The cylinder 210 is slidable relative to the pump body 10. For example, refer to... Figure 17 , Figure 18 , Figure 19 ,and Figure 20 The syringe fixing device 20 may further include a guide ring 270, which is installed in the connecting through hole 117 of the pump body 10. Exemplarily, the guide ring 270 and the first housing 110 can be an integral structure. A guide groove 271 is provided on the inner side of the guide ring 270. The cylinder 210 is inserted into the guide ring 270, and a guide protrusion 213 is provided on the outer side of the cylinder 210 near its second end. The guide protrusion 213 slides within the guide groove 271. When the first driving mechanism 260 drives the cylinder 210 to slide relative to the pump body 10 via the transmission rod 240 and the brake 230, the guide groove 271 can constrain and guide the guide protrusion 213, thereby constraining and guiding the sliding direction of the cylinder 210.

[0140] In some possible implementations of the first embodiment of this application, the guide groove 271 can also be a straight groove parallel to the axis of the guide ring 270. When the first drive mechanism 260 is activated, the first drive mechanism 260 drives the transmission rod 240 to slide away from the pump body 10 relative to the cylinder 210. The transmission rod 240 drives the brake member 230 to slide away from the pump body 10. The brake member 230 pushes the fixing block 220, the cylinder 210 and the guide protrusion 213 to slide away from the pump body 10 along the straight groove, thereby making the fixing block 220 away from the first receiving cavity 221, preventing the syringe 40 from interfering with the fixing block 220 when the syringe 40 is placed in the first receiving cavity 221, and improving the convenience of placing the syringe 40.

[0141] In some other possible implementations of the first embodiment of this application, refer to Figure 21 and Figure 22 The guide groove 271 may include a connected straight groove segment 272 and a spiral groove segment 273. The straight groove segment 272 extends parallel to the axis of the guide ring 270, and forms a guide inlet at the second end of the cylinder 210. The spiral groove segment 273 is closer to the fixing block 220 than the straight groove segment 272, and extends around the axis of the guide ring 270.

[0142] When the first drive mechanism 260 is activated, it drives the transmission rod 240 to slide away from the pump body 10 relative to the cylinder 210. The transmission rod 240 drives the brake 230 to slide away from the pump body 10. The brake 230 pushes the fixing block 220 and the cylinder 210 to slide away from the pump body 10 relative to the pump body 10. The guide protrusion 213 enters the straight groove section 272 from the guide inlet. The straight groove section 272 guides the guide protrusion 213, causing the cylinder 210 and the fixing block 220 to move away from the pump body 10 along the extension direction of the straight groove section 272. When the syringe 40 is placed in the first receiving cavity 221, the fixing block 220 can move away from the syringe 40 along the extension direction perpendicular to the syringe 40 to form a gap between them, thereby avoiding friction between the fixing block 220 and the syringe 40 and causing the position of the syringe 40 to change.

[0143] The guide protrusion 213 enters the spiral groove section 273 from the straight groove section 272. The spiral groove section 273 guides the guide protrusion 213, causing the cylinder 210 and the fixing block 220 to move away from the pump body 10 along the extension direction of the spiral groove section 273. This causes the cylinder 210 and the fixing block 220 to rotate outward while moving away from the pump body 10, thereby further reducing or eliminating the obstruction of the first receiving cavity 221 by the fixing block 220, and further improving the convenience of placing and removing the syringe 40.

[0144] When the first drive mechanism 260 reverses its direction, it drives the transmission rod 240 to slide relative to the cylinder 210 toward the pump body 10. The transmission rod 240 drives the brake 230 to slide toward the pump body 10, and the brake 230 pushes the compression elastic member 250, compressing it. The compression elastic member 250 then applies a restoring force to the limiting part 201. The spiral groove section 273 guides the guide protrusion 213, causing the cylinder 210 and the fixing block 220 to approach the pump body 10 along the extension direction of the spiral groove section 273. This causes the cylinder 210 and the fixing block 220 to rotate inward as they approach the pump body 10.

[0145] The guide protrusion 213 enters the straight groove section 272 from the spiral groove section 273. The straight groove section 272 guides the guide protrusion 213, causing the cylinder 210 and the fixing block 220 to approach the pump body 10 along the extension direction of the straight groove section 272. When the syringe 40 is placed in the first receiving cavity 221, the fixing block 220 can approach the syringe 40 along the extension direction perpendicular to the syringe 40 until it abuts against the syringe 40, thereby preventing the fixing block 220 from rubbing against the syringe 40 and causing the position of the syringe 40 to change.

[0146] It should be noted that the outward rotation of the cylinder 210 and the fixing block 220 refers to the cylinder 210 and the fixing block 220 rotating around... Figure 3 Rotation in the direction m shown. The inward rotation of the cylinder 210 and the fixed block 220 refers to the cylinder 210 and the fixed block 220 rotating around... Figure 4 Rotate in the direction indicated by n.

[0147] In some possible implementations of the first embodiment of this application, the guide protrusion 213 can be an integral structure with the cylinder 210, and the guide protrusion 213 can be directly formed on the outside of the cylinder 210.

[0148] In some other possible implementations of the first embodiment of this application, the guide protrusion 213 may also be a separate structure from the cylinder 210. For example, refer to... Figure 10 and Figure 11 The syringe body 210 has a mounting groove 214 on its side near its second end, forming a mounting opening at the second end of the syringe body 210. A connecting cylinder 215 is provided at the second end of the syringe body 210, the radius of which is smaller than the radius of the syringe body 210. The syringe fixing device 20 may also include a first mounting bracket, which may include a first mounting ring 216 and a first connecting arm 217. The first mounting ring 216 is sleeved on the connecting cylinder 215. The first connecting arm 217 is axially arranged along and connected to the first mounting ring 216, and is installed within the mounting groove 214. A guide protrusion 213 is provided on the side of the first connecting arm 217 facing away from the mounting groove 214.

[0149] During the installation and adjustment of the syringe fixing device 20, when it is necessary to adjust the shape, size, position and other parameters of the guide protrusion 213, the first mounting bracket can be removed from the cylinder 210, the guide protrusion 213 can be adjusted, and then the first mounting bracket can be installed on the cylinder 210 without disassembling the cylinder 210, which improves the convenience of adjusting the guide protrusion 213.

[0150] The syringe fixing device 20 may also include a specification sensor connected to the barrel 210 and located near the second end of the barrel 210. The specification sensor is used to identify the specification of the syringe 40. For example, the specification sensor may be a sliding potentiometer or other types of sensors capable of identifying the specification of the syringe 40, which will not be described in detail in the first embodiment of this application.

[0151] For example, refer to Figure 10 and Figure 11The syringe fixing device 20 may further include a second mounting bracket 280, which may include a second mounting ring 281 and a second connecting arm 282. The second mounting ring 281 is sleeved on the connecting cylinder 215 and abuts against the first mounting ring 216. The second connecting arm 282 is arranged along the axial direction of the second mounting ring 281, with its first end connected to the second mounting ring 281 and its second end used to mount a specification sensor.

[0152] During the installation and adjustment of the syringe fixing device 20, when it is necessary to adjust the position and other parameters of the specification sensor, the second mounting bracket can be removed from the cylinder 210, the second mounting bracket and / or the specification sensor can be adjusted, and then the second mounting bracket can be installed back on the cylinder 210 without disassembling the cylinder 210, which improves the convenience of adjusting the specification sensor.

[0153] For example, a snap-fit ​​groove 218 may be provided on the outer side of the connecting cylinder 215, and the snap-fit ​​groove 218 may be located on the side of the second mounting ring 281 facing away from the first mounting ring 216. The syringe fixing device 20 may also include a shaft retaining ring 219, which snaps into the snap-fit ​​groove 218. Both the second mounting bracket 280 and the first mounting bracket are fixed to the cylinder 210 by the shaft retaining ring 219, making the fixing and installation of the second mounting bracket 280 and the first mounting bracket more convenient.

[0154] For example, a corrugated gasket 283 may be provided between the first mounting ring 216 and the second mounting ring 281. The corrugated gasket 283 is sleeved on the connecting cylinder 215 and abuts against the first mounting ring 216 and the second mounting ring 281 respectively. The corrugated gasket 283 can apply tension to the first mounting ring 216 and the second mounting ring 281, thereby causing the first mounting ring 216 to abut against the second end of the cylinder 210 and the second mounting ring 281 to abut against the shaft retaining ring 219, improving the stability of the first mounting bracket and the second mounting bracket 280, and thus improving the positional stability of the guide protrusion 213 and the specification sensor. It is understood that the corrugated gasket 283 can also be replaced with other elastic gaskets.

[0155] refer to Figures 3 to 6 The syringe fixing device 20 may also include a clip 290, which is connected to the pump body 10 and opposite to the fixing block 220. The clip 290 can fix the flange of the syringe 410, thereby improving the stability of the syringe 40.

[0156] For example, the clip 290 can be linked with the barrel 210. When the barrel 210 drives the fixing block 220 to fix the syringe 40, the clip 290 fixes the flange of the syringe 410. When the barrel 210 drives the fixing block 220 away from the syringe 40, the clip 290 moves away from the flange of the syringe 410.

[0157] For example, the in-situ sensor can be mounted on the clip 290, which will not be described in detail in the first embodiment of this application.

[0158] The injection pump also includes a pusher 30 connected to the pump body 10. The pusher 30 is configured to engage with the push handle 420 of the syringe 40 to drive the push handle 420 to slide relative to the syringe barrel 410 of the syringe 40.

[0159] For example, refer to Figures 1 to 6 The pushing device 30 may include a push rod 310, a pushing part 320, and a second driving mechanism 330. The push rod 310 is slidable relative to the pump body 10 along the extension direction of the syringe 40. For example, a sliding through hole 118 may be provided on the side wall of the first housing 110, through which the push rod 310 passes and is slidable. The pushing part 320 is located outside the pump body 10 and is connected to the end of the push rod 310 located outside the pump body 10. The second driving mechanism 330 is located inside the pump body 10; for example, the second driving mechanism 330 may be installed in the fourth receiving cavity 113. The second driving mechanism 330 is connected to the end of the push rod 310 located inside the pump body 10.

[0160] When the second drive mechanism 330 is activated, it can drive the push rod 310 and the push part 320 to slide away from the pump body 10 relative to the pump body 10, so as to place the syringe 40 inside the pump body 10. When the second drive mechanism 330 is activated in the opposite direction, it can drive the push rod 310 and the push part 320 to slide closer to the pump body 10 relative to the pump body 10, so that the push part 320 pushes the plunger 420 of the syringe 40 to slide into the syringe 410, so as to inject the liquid medicine in the syringe 410 into the body.

[0161] For example, refer to Figure 23 A pressure sensor 321 may be provided on the side of the pusher 320 facing the push rod 310. When the syringe 40 is placed inside the pump body 10, the pusher 320 moves closer to the push handle 420 of the syringe 40, and the pressure sensor 321 comes into contact with the end of the push handle 420. The pressure sensor 321 can measure the pressure value between the pusher 320 and the end of the push handle 420, and the state of the push handle 420 can be determined by this pressure value.

[0162] For example, the pusher 320 may also be provided with a claw 322 on the side facing the push rod 310, the claw 322 being used to engage the push handle 420 of the syringe 40.

[0163] refer to Figure 24 The second embodiment of this application provides a control method for an infusion pump, which is applied to the infusion pump and may include the following steps:

[0164] S100. Generate a first control signal and transmit the first control signal to the first drive mechanism of the syringe fixing device. The first control signal indicates that the syringe is installed in place.

[0165] The first control signal can be used to instruct the first drive mechanism to drive the fixing block of the syringe fixing device to abut against the syringe barrel, and drive the braking part of the syringe fixing device to extend from the opening and abut against the syringe plunger.

[0166] For example, the actuating device 30 can be put into an open state before generating the first control signal. For instance, the method may include:

[0167] When the syringe pump is powered on, a first opening signal is generated. This first opening signal controls the pusher 320 of the pusher device 30 to move away from the pump body 10, which is used to mount the syringe 40. Exemplarily, the syringe pump may include a controller. When the syringe pump is powered on, the controller receives a power-on signal, generates the first opening signal, and sends it to the second drive mechanism 330 of the pusher device 30. In response to the first opening signal, the second drive mechanism 330 drives the push handle 310 to move the pusher 320 away from the pump body 10, thereby preventing the pusher 320 from obstructing the second receiving cavity 111 of the pump body 10, facilitating the placement of the syringe 40 within the second receiving cavity 111.

[0168] Alternatively, when the infusion pump is powered on, it receives a second operation on the second target button and generates a first open signal in response to the second operation. For example, after the infusion pump is powered on, the operator can perform a second operation on the second target button. The second target button can be the first button 121 or the second button 132, or a virtual button displayed on the screen 131, etc. The second operation refers to a pressing or rotating operation performed by the operator on the second target button. After receiving the operator's second operation, the controller generates a first open signal in response to the second operation and sends the first open signal to the second drive mechanism 330 of the push device 30. In response to the first open signal, the second drive mechanism 330 drives the push handle 310 to move the push part 320 away from the pump body 10.

[0169] For example, the door 130 can be in an open state before the first control signal is generated. For instance, the door 130 is open when the infusion pump is powered on. The door 130 can also be manually opened after the infusion pump is powered on. The door 130 can also be connected to a third drive mechanism. When the infusion pump is powered on, the controller receives the power-on signal, generates a second opening signal, and sends the second opening signal to the third drive mechanism. The third drive mechanism responds to the second opening signal and drives the door 130 to open.

[0170] For example, the syringe holder 20 can be in an open state before the first control signal is generated. For instance, when the syringe pump is powered on, the controller receives the power-on signal and generates a third opening signal, which is then sent to the first drive mechanism 260 of the syringe holder 20. In response to the third opening signal, the first drive mechanism 260 drives the transmission rod 240 to slide relative to the cylinder 210 away from the pump body 10. The transmission rod 240 drives the brake 230 to slide relative to the cylinder 210 away from the pump body 10. The brake 230 abuts against the fixing block 220 to apply a pushing force to the fixing block 220, causing the fixing block 220 and the cylinder 210 connected to the fixing block 220 to slide relative to the pump body 10 away from the pump body 10, thereby moving the fixing block 220 away from the first receiving cavity 221 to facilitate the placement of the syringe 40.

[0171] When the syringe 40 is in place, a first control signal is generated. Exemplarily, in the method of the second embodiment of this application, a first operation on a first target button can be received, and a first control signal is generated in response to the first operation. For example, when the syringe 40 is in place, the operator can confirm the placement status of the syringe 40. If the operator deems the syringe 40 to be in place, the first operation is performed on the first target button. The first target button can be a first button 121 or a second button 132, or a virtual button displayed on the display screen 131, etc. The first operation refers to a pressing or rotating operation performed by the operator on the first target button. Exemplarily, after receiving the operator's first operation, the controller generates a first control signal in response to the first operation.

[0172] Alternatively, the controller can receive a presence signal generated by a presence sensor and generate a first control signal based on the presence signal. The presence signal is generated by the presence sensor when the syringe is installed in place. For example, when syringe 40 is placed in place, syringe 40 triggers the presence sensor, which generates a presence signal. After receiving the presence signal, the controller generates the first control signal based on the presence signal.

[0173] The controller can send a first control signal to the first drive mechanism 260 of the syringe fixing device 20. The first drive mechanism 260 responds to the first control signal, causing the syringe fixing device 20 to be in a first fixed state, and further to a second fixed state. Specifically, the first drive mechanism 260 drives the transmission rod 240 to move the brake 230 towards the syringe 40. The brake 230 compresses the elastic member 250, which, through the limiting part 201, pushes the cylinder 210 and the fixing block 220 towards the syringe 40. The fixing block 220 abuts against the syringe barrel 410 of the syringe 40 to fix the syringe barrel 410. The first drive mechanism 260 continues to drive the transmission rod 240 to move the brake 230 towards the syringe 40. The braking part 231 of the brake 230 extends from the opening 222 and abuts against the plunger 420 of the syringe 40 to fix the plunger 420.

[0174] S200: Generate a second control signal and transmit the second control signal to the pushing device. The second control signal instructs the pushing device to engage with the plunger handle of the syringe.

[0175] For example, after determining that the fixing block abuts against the syringe barrel and the braking part abuts against the syringe plunger, a second control signal can be generated.

[0176] For example, after the fixing block 220 abuts against the syringe barrel of the syringe 40 and the braking part 231 abuts against the plunger 420 of the syringe 40, the controller can generate a second control signal and transmit the second control signal to the second drive mechanism 330 of the pushing device 30. In response to the second control signal, the second drive mechanism 330 drives the push rod 310 to slide the pushing part 320 toward the pump body 10 so as to engage with the plunger 420 of the syringe 40.

[0177] For example, a second control signal can be generated after a first preset duration following the generation of the first control signal. During the first preset duration, the syringe fixing device 20 can switch to a first fixed state and then further switch to a second fixed state. After the syringe fixing device 20 switches to the second fixed state, the controller generates a second control signal to control the push device 30 to engage with the push handle 420 of the syringe 40.

[0178] For example, the operator can also confirm whether the syringe fixing device 20 is in the second fixed state. If the operator believes that the syringe fixing device 20 is in the second fixed state, then a third operation is performed on the third target button. The third target button can be the first button 121 or the second button 132, or it can be a virtual button displayed on the display screen 131, etc. The third operation refers to the operator's pressing or rotating operation on the third target button. After receiving the operator's third operation, the controller can generate a second control signal in response to the third operation.

[0179] The second control signal is used to instruct the actuating device to engage with the syringe plunger. Exemplarily, the actuating portion 320 of the actuating device 30 is provided with a pressure sensor 321 and a locking claw 322. When the actuating portion 320 of the actuating device 30 abuts against the plunger 420 of the syringe 40, the pressure sensor 321 detects the pressure value between the actuating portion 320 and the plunger 420. After acquiring this pressure value, the controller determines whether the pressure value is within a preset range. If the pressure value is within the preset range, it is determined that the actuating portion 320 and the plunger 420 are in close contact. The controller generates an engagement signal and sends the engagement signal to the locking claw 322. The locking claw 322 engages the plunger 420 in response to the engagement signal.

[0180] S300, Generate a third control signal and transmit the third control signal to the first drive mechanism. The third control signal instructs the braking part to leave the syringe plunger.

[0181] After the pushing part 320 of the pushing device 30 engages with the push handle 420 of the syringe 40, a third control signal can be generated. For example, the second control signal can be generated a second preset time after the engagement signal is generated. During the second preset time, the gripper 322 can complete the engagement of the push handle 420. After the gripper 322 completes the engagement of the push handle 420, the controller generates the third control signal.

[0182] For example, the gripper 322 may be equipped with a latching switch. When the gripper 322 latches with the push handle 420, the latching switch is triggered, and the latching switch generates a latching completion signal. After receiving the latching completion signal, the controller generates a third control signal.

[0183] After the controller generates the third control signal, it sends the third control signal to the first drive mechanism 260. In response to the third control signal, the first drive mechanism 260 drives the brake part 231 of the brake member 230 to retract from the opening 222, so that the brake part 231 leaves the push handle 420 of the syringe 40, thereby making the syringe fixing device 20 in the first fixed state.

[0184] Then, the pushing device 30 can push the push handle 420 to inject the medicine.

[0185] The control method for the syringe pump provided in the second embodiment of this application, after placing the syringe in the pump body, can control the first drive mechanism to operate, so that the syringe fixing device is in a first state, that is, the fixing block of the syringe fixing device abuts against the syringe barrel to fix the syringe barrel. Continuing to control the first drive mechanism to operate, the syringe fixing device is in a second state, that is, the braking part of the brake plate of the syringe fixing device abuts against the syringe plunger to fix the syringe plunger. Therefore, during the process of fixing the syringe, during the subsequent locking of the syringe plunger, and in the event of accidental contact with the syringe plunger, the plunger of the syringe can be prevented from moving relative to the syringe barrel, thereby preventing the uncontrolled injection of medication into the body, improving the medication injection accuracy and safety performance of the syringe pump.

[0186] refer to Figure 26 The third embodiment of this application provides a method for controlling an injection pump, the method comprising the following steps:

[0187] S001, Power on.

[0188] For example, the syringe pump can be powered on first to turn it on.

[0189] S002, the push device is opened.

[0190] For example, after receiving a power-on signal, the controller can generate a first opening signal and send the first opening signal to the second drive mechanism 330 of the push device 30. In response to the first opening signal, the second drive mechanism 330 drives the push handle 310 to move the push part 320 away from the pump body 10, so as to open the push device 30.

[0191] S003. Open the door to open the syringe fixing device.

[0192] For example, after receiving a power-on signal, the controller can generate a second opening signal and send the second opening signal to a third drive mechanism. The third drive mechanism responds to the second opening signal and drives the door 130 to open. Alternatively, the operator can manually open the door 130.

[0193] For example, when the syringe pump is powered on, the controller receives the power-on signal and generates a third opening signal, which is then sent to the first drive mechanism 260 of the syringe fixing device 20. In response to the third opening signal, the first drive mechanism 260 drives the transmission rod 240 to slide relative to the cylinder 210 away from the pump body 10. The transmission rod 240 drives the brake member 230 to slide relative to the cylinder 210 away from the pump body 10. The brake member 230 abuts against the fixing block 220 to apply a pushing force to the fixing block 220, causing the fixing block 220 and the cylinder 210 connected to the fixing block 220 to slide relative to the pump body 10 away from the pump body 10, thus putting the syringe fixing device 20 in the open state.

[0194] Alternatively, when the door 130 is opened, the door status sensor is triggered, and the door status sensor sends an opening signal. After receiving the opening signal, the controller generates a third opening signal and sends the third opening signal to the first drive mechanism 260 of the syringe fixing device 20. The first drive mechanism 260 responds to the third opening signal, causing the syringe fixing device 20 to be in the open state.

[0195] S004. Insert the syringe, and the in-situ sensor identifies that the syringe is in place.

[0196] For example, the syringe 40 is placed in the second receiving cavity 111 of the pump body 10. The syringe 40 triggers the presence sensor, which generates a presence signal. After receiving the presence signal, the controller generates a first control signal based on the presence signal.

[0197] S005. Position the syringe fixing device in the first fixed state to fix the syringe barrel.

[0198] For example, the controller sends a first control signal to the first drive mechanism 260 of the syringe fixing device 20. In response to the first control signal, the first drive mechanism 260 drives the transmission rod 240 to drive the brake member 230 to slide toward the syringe 40. The brake member 230 compresses the elastic member 250. The elastic member 250 pushes the cylinder 210 and the fixing block 220 toward the syringe 40 through the limiting part 201. The fixing block 220 abuts against the syringe barrel 410 of the syringe 40 to fix the syringe barrel 410.

[0199] S006. Position the syringe fixing device in the second fixed state to fix the syringe plunger.

[0200] For example, in response to the first control signal, the first drive mechanism 260 continues to drive the transmission rod 240 to drive the brake 230 to slide toward the syringe 40. The brake part 231 of the brake 230 extends out from the opening 222 and abuts against the push handle 420 of the syringe 40 to fix the push handle 420.

[0201] For example, during the process of placing the syringe fixing device 20 in a first fixed state and further in a second fixed state, the controller may also generate a fixing signal and send the fixing signal to the clamp 290, which in response to the fixing signal abuts against the syringe 410 to fix the syringe 410.

[0202] Optionally, the clip 290 can also be mechanically linked with the syringe fixing device 20. When the syringe fixing device 20 switches to the first fixing state, the clip 290 can be driven to fix the syringe 410.

[0203] S007. Identify the specifications of the syringe.

[0204] For example, during the process of the first drive mechanism 260 driving the syringe fixing device 20 to be in the first fixed state and the second fixed state, the specification sensor moves with the barrel 210, can identify the specification of the syringe 40, and generate specification information. The controller can acquire the specification information.

[0205] S008, The pushing part of the pushing device moves toward the syringe.

[0206] For example, after the fixing block 220 abuts against the syringe barrel of the syringe 40 and the braking part 231 abuts against the plunger 420 of the syringe 40, the controller can generate a second control signal and transmit the second control signal to the second drive mechanism 330 of the pushing device 30. In response to the second control signal, the second drive mechanism 330 drives the push rod 310 to drive the pushing part 320 to slide toward the pump body 10.

[0207] S009. The pressure sensor identifies the status of the syringe plunger.

[0208] For example, the pushing part 320 of the pushing device 30 is provided with a pressure sensor 321 and a gripper 322. When the pushing part 320 of the pushing device 30 abuts against the plunger 420 of the syringe 40, the pressure sensor 321 detects the pressure value between the pushing part 320 and the plunger 420, and the state of the plunger 420 can be identified based on this pressure value. For example, after acquiring the pressure value, the controller can determine whether the pressure value is within a preset range. If the pressure value is within the preset range, it is determined that the pushing part 320 and the plunger 420 are in close contact.

[0209] S010, The claw engages with the syringe plunger.

[0210] For example, after determining that the pusher 320 is in close contact with the push handle 420, the controller can generate a latching signal and send the latching signal to the latch 322. The latch 322 latches the push handle 420 in response to the latching signal.

[0211] S011. Position the syringe fixing device in the first fixed state.

[0212] After the pushing part 320 of the pushing device 30 engages with the push handle 420 of the syringe 40, a third control signal can be generated. After the controller generates the third control signal, it sends the third control signal to the first drive mechanism 260. In response to the third control signal, the first drive mechanism 260 drives the braking part 231 of the brake member 230 to retract from the opening 222, so that the braking part 231 leaves the push handle 420 of the syringe 40, thereby making the syringe fixing device 20 a first fixed state.

[0213] S012. Complete syringe loading.

[0214] After the syringe 40 is loaded, the pusher 30 can push the push handle 420 to inject the medicine into the body.

[0215] refer to Figure 27 The fourth embodiment of this application provides a method for controlling an injection pump, which differs from the third embodiment of this application in that step S004 is: inserting a syringe and performing a first operation on a first target button.

[0216] For example, when the syringe 40 is in place, the operator can confirm the placement status of the syringe 40. If the operator believes that the syringe 40 is in place, they will perform a first operation on the first target button. The first target button can be a first button 121 or a second button 132, or a virtual button displayed on the display screen 131, etc. The first operation refers to the operator's pressing or rotating operation on the first target button. For example, after receiving the operator's first operation, the controller generates a first control signal in response to the first operation.

[0217] Other steps in the fourth embodiment of this application can be found in the third embodiment, and will not be repeated here.

[0218] refer to Figure 27 and Figure 28 The fifth embodiment of this application provides a control method for an injection pump, which differs from the third and fourth embodiments of this application in that step S002 is: performing a second operation on the second target button to push the device open.

[0219] For example, after the infusion pump is powered on, the operator can perform a second operation on the second target button. The second target button can be the first button 121 or the second button 132, or it can be a virtual button displayed on the display screen 131, etc. The second operation refers to the operator's pressing or rotating operation on the second target button. After receiving the operator's second operation, the controller generates a first opening signal in response to the second operation and sends the first opening signal to the second drive mechanism 330 of the push device 30. In response to the first opening signal, the second drive mechanism 330 drives the push rod 310 to move the push part 320 away from the pump body 10.

[0220] Other steps in the fifth embodiment of this application can be found in the third and fourth embodiments, and will not be repeated here.

[0221] refer to Figure 29 The sixth embodiment of this application provides a method for controlling an injection pump, including the following steps:

[0222] S014. Stop the infusion.

[0223] For example, the infusion can be stopped after the push device 30 injects the medication according to a specific procedure. Alternatively, after the operator performs a fourth operation on the fourth target button, the controller generates a stop infusion signal based on the fourth operation and sends the stop infusion signal to the push device 30, which then stops the infusion in response to the stop infusion signal.

[0224] S015. Open the door and perform the fifth operation on the fifth target button.

[0225] For example, when the push device 30 stops the infusion, the push device 30 can generate an infusion completion signal. After receiving the infusion completion signal, the controller generates a fourth control signal and sends the fourth control signal to the third drive mechanism of the door 130. The fourth control signal is used to instruct the third drive mechanism to open the door 130.

[0226] After the door 130 is opened, the operator can perform a fifth operation on the fifth target button. For example, the fifth target button can be the first button 121 or the second button 132, or it can be a virtual button displayed on the screen 131, etc. The fifth operation refers to the operator's pressing or rotating operation on the fifth target button.

[0227] S016, The chuck releases the syringe plunger, and the plunger moves the pusher away from the syringe plunger.

[0228] For example, after receiving the fifth operation from the operator, the controller generates a fifth control signal in response to the fifth operation and sends the fifth control signal to the pawl 322 of the push device 30. In response to the fifth control signal, the pawl 322 releases the push handle 420.

[0229] After the pawl 322 releases the push handle 420, the second drive mechanism 330, in response to the action of the pawl 322 releasing the push handle 420, generates a sixth control signal and sends the sixth control signal to the second drive mechanism 330 of the push device 30. In response to the sixth control signal, the second drive mechanism 330 drives the push rod 310 away from the pump body 10, so that the push part 320 is away from the push handle 420 of the syringe 40.

[0230] S017. Put the syringe fixing device in the open position.

[0231] After the pusher 320 moves away from the plunger 420 of the syringe 40, the pressure sensor 321 measures that the pressure between the pusher 320 and the plunger 420 is 0. When the controller detects that the pressure between the pusher 320 and the plunger 420 is 0, it generates a seventh control signal and sends the seventh control signal to the first drive mechanism 260 of the syringe fixing device 20. In response to the seventh control signal, the first drive mechanism 260 drives the transmission rod 240 to drive the brake 230 to slide away from the pump body 10 relative to the barrel 210. The brake 230 pushes the fixing block 220 and the barrel 210 to slide away from the pump body 10, and the fixing block 220 leaves the syringe barrel 410 of the syringe 40.

[0232] S018. Remove the syringe.

[0233] Remove the syringe 40 from the second receiving cavity 111 of the pump body 10.

[0234] refer to Figure 30 The seventh embodiment of this application provides a control method for an injection pump, which differs from the sixth embodiment in that step S015 is: performing a fifth operation on the fifth target button; and step S017 is: opening the syringe fixing device and pushing open the door.

[0235] For example, when the infusion device 30 stops, the operator can perform a fifth operation on the fifth target button. For example, the fifth target button can be the first button 121 or the second button 132, or a virtual button displayed on the screen 131, etc. The fifth operation refers to the operator's pressing or rotating operation on the fifth target button.

[0236] After receiving the fifth operation from the operator, the controller generates a fifth control signal and a sixth control signal in response to the fifth operation, and sends the fifth control signal and the sixth signal to the push device 30, so that the pawl 322 releases the push handle 420 and the push part 320 moves away from the push handle 420.

[0237] After the pusher 320 moves away from the plunger 420 of the syringe 40, the pressure sensor 321 measures that the pressure between the pusher 320 and the plunger 420 is 0. When the controller detects that the pressure between the pusher 320 and the plunger 420 is 0, it generates a seventh control signal and sends the seventh control signal to the first drive mechanism 260 of the syringe fixing device 20. In response to the seventh control signal, the first drive mechanism 260 drives the transmission rod 240 to drive the brake 230 to slide away from the pump body 10 relative to the barrel 210. The brake 230 pushes the fixing block 220 and the barrel 210 to slide away from the pump body 10, and the fixing block 220 leaves the syringe barrel 410 of the syringe 40.

[0238] The fixing block 220 pushes open the door 130 as it leaves the syringe 410 of the syringe 40, thus eliminating the need to control the opening of the door 130 and saving control steps.

[0239] For the other steps of the seventh embodiment, please refer to the sixth embodiment, which will not be repeated here.

[0240] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A syringe fixing device for fixing a syringe placed in a pump body, characterized in that, include: A cylindrical body is connected to the pump body and is slidable relative to the pump body, and a limiting part is provided on the inner wall of the cylindrical body; A fixing block is connected to the first end of the cylinder away from the pump body and abuts against the syringe barrel. The fixing block is provided with a first receiving cavity communicating with the cylinder, and the first receiving cavity has an opening facing the syringe. A braking element located within the first receiving cavity, the braking element having a braking portion opposite to the opening; A transmission rod is slidably disposed inside the cylinder, with its first end extending into the first receiving cavity and connected to the braking component. A compression elastic element is located in the connected first receiving cavity and the cylinder, with a first end of the compression elastic element abutting against the limiting part and a second end of the compression elastic element abutting against the braking element. A first driving mechanism is connected to the second end of the transmission rod to drive the transmission rod to slide relative to the cylinder. When the syringe fixing device is in the first fixed state, the first driving mechanism drives the transmission rod to move the braking member toward the syringe, the braking member compresses the compression elastic member, and the compression elastic member pushes the cylinder and the fixing block toward the syringe through the limiting part, and the fixing block abuts against the syringe barrel; when the syringe fixing device is in the second fixed state, the first driving mechanism continues to drive the transmission rod to move the braking member toward the syringe, and the braking part of the braking member extends from the opening and abuts against the syringe push handle.

2. The syringe fixing device according to claim 1, characterized in that, The transmission rod has a transmission thread on its outer side near its second end; The first driving mechanism includes a drive motor and a transmission nut. The drive motor is mounted on the pump body, and the output shaft of the drive motor is connected to the transmission nut to drive the transmission nut to rotate. The transmission nut is sleeved on the transmission thread.

3. The syringe fixing device according to claim 2, characterized in that, The first drive mechanism further includes a transmission assembly, which connects the drive motor and the transmission nut.

4. The syringe fixing device according to claim 3, characterized in that, The transmission nut is rotatably connected to the pump body around the axis of the transmission nut, and transmission teeth are provided on the outer side of the transmission nut; The transmission assembly includes at least one transmission gear, which is sleeved on the output shaft of the drive motor and meshes with the transmission gear.

5. The syringe fixing device according to any one of claims 1-4, characterized in that, The braking component further includes a connecting part, the first end of which is connected to the first end of the transmission rod, the second end of which is connected to the braking component, and the connecting part abuts against the fixing block.

6. The syringe fixing device according to claim 5, characterized in that, The connecting part has an arc-shaped structure, which bends away from the pump body.

7. The syringe fixing device according to any one of claims 1-4, characterized in that, The fixing block includes a first fixing part and a second fixing part connected to each other. The first fixing part is connected to the end of the cylinder away from the pump body. The first fixing part is provided with a first receiving groove on the side away from the cylinder body. The bottom of the first receiving groove is provided with the opening. The second fixing part is located on the side of the first fixing part away from the cylinder body. The second fixing part is provided with a second receiving groove on the side facing the first fixing part. The second receiving groove and the first receiving groove surround the first receiving cavity.

8. The syringe fixing device according to claim 7, characterized in that, The first fixing part includes a first sub-fixing part and a second sub-fixing part arranged and connected along the radial direction of the cylinder; a portion of the second sub-fixing part protrudes from the end face of the first sub-fixing part facing the pump body, and the portion of the second sub-fixing part protruding from the first sub-fixing part forms a crimping groove with the first sub-fixing part, the crimping groove being used to engage with the flange of the syringe; the opening is provided in the second sub-fixing part and is located on the side of the crimping groove facing away from the pump body.

9. The syringe fixing device according to any one of claims 1-4, characterized in that, The syringe fixing device also includes a guide ring, which is installed in the connecting through hole of the pump body, and a guide groove is provided on the inner side of the guide ring; The cylindrical body is inserted into the guide ring, and a guide protrusion is provided on the outer side of the cylindrical body near its second end. The guide protrusion slides in the guide groove.

10. The syringe fixing device according to claim 9, characterized in that, The guide groove includes a straight groove segment and a spiral groove segment connected together. The straight groove segment extends parallel to the axis of the guide ring and forms a guide inlet at the second end of the cylinder. The spiral groove segment is closer to the fixed block than the straight groove segment, and the spiral groove segment extends around the axis of the guide ring.

11. The syringe fixing device according to claim 9, characterized in that, The cylinder has a mounting groove on its side near its second end, and the mounting groove forms a mounting opening at the second end of the cylinder; a connecting cylinder is provided at the second end of the cylinder, and the radius of the connecting cylinder is smaller than the radius of the cylinder. The syringe fixing device further includes a first mounting bracket, which includes a first mounting ring and a first connecting arm. The first mounting ring is sleeved on the connecting cylinder. The first connecting arm is arranged along the axial direction of the first mounting ring and connected to the first mounting ring. The first connecting arm is installed in the mounting groove. The guide protrusion is provided on the side of the first connecting arm facing away from the mounting groove.

12. The syringe fixing device according to claim 11, characterized in that, The syringe fixing device also includes a specification sensor, which is connected to the barrel and located near the second end of the barrel. The specification sensor is used to identify the specification of the syringe.

13. The syringe fixing device according to claim 12, characterized in that, The syringe fixing device further includes a second mounting bracket, which includes a second mounting ring and a second connecting arm. The second mounting ring is sleeved on the connecting cylinder and abuts against the first mounting ring. The second connecting arm is arranged along the axial direction of the second mounting ring, the first end of the second connecting arm is connected to the second mounting ring, and the second end of the second connecting arm is used to mount the sensor of the specified size.

14. The syringe fixing device according to claim 13, characterized in that, The outer side of the connecting cylinder is provided with a snap-fit ​​groove, which is located on the side of the second mounting ring that faces away from the first mounting ring; The syringe fixing device also includes a shaft retaining ring, which is snapped into the snap-fit ​​groove.

15. The syringe fixing device according to claim 14, characterized in that, A corrugated gasket is provided between the first mounting ring and the second mounting ring. The corrugated gasket is sleeved on the connecting cylinder and abuts against the first mounting ring and the second mounting ring respectively.

16. The syringe fixing device according to any one of claims 1-4, characterized in that, The cylinder includes a first cylinder and a second cylinder, wherein the first cylinder is slidable relative to the pump body; The first end of the second cylinder is sleeved on the first end of the first cylinder away from the pump body and is fixedly connected to the first cylinder so that the transmission rod can pass through; the first end of the first cylinder is the limiting part, and the second end of the second cylinder is connected to the fixing block.

17. An injection pump, characterized in that, The device includes a pump body, a pusher, and a syringe fixing device as described in any one of claims 1-16; the pump body has a second receiving space for accommodating the syringe; the pusher is connected to the pump body and is configured to engage with the plunger of the syringe to drive the plunger to slide relative to the syringe barrel.

Images