Digital display balloon expansion pressure pump

Abstract

This utility model relates to the field of balloon expansion pressure pump technology, and more particularly to a digital display balloon expansion pressure pump, comprising an injection tube, a digital display pressure gauge, a self-locking mechanism, a piston, and a push rod. One end of the injection tube is provided with a plug-in connection mechanism, through which the digital display pressure gauge is connected to the injection tube. The self-locking mechanism is located at the end of the injection tube away from the plug-in connection mechanism. The piston is slidably disposed within the injection tube, and the push rod extends into the injection tube through the self-locking mechanism to drive the piston to slide within the injection tube. This utility model, through the digital display pressure gauge, enables the pressure pump to display the pressure status within the balloon in real time and accurately, providing the operator with intuitive feedback information. The digital display pressure gauge is connected to the injection tube through the plug-in connection mechanism, ensuring airtightness between the two. This effectively avoids the air leakage problem that may occur at the connection between the pressure gauge and the injection tube in traditional pressure pumps, improving the accuracy of pressure readings and the safety of the surgery.

Description

Technical Field

[0001] This utility model relates to the field of balloon expansion pressure pump technology, and in particular to a digital display balloon expansion pressure pump. Background Technology

[0002] In the field of interventional surgery, balloon dilation catheters are one of the commonly used medical devices. They expand by applying pressure to the balloon, thereby achieving the dilation treatment of narrowed blood vessels or lumens.

[0003] However, existing balloon inflation pumps present several limitations that hinder surgical outcomes. In particular, traditional pumps often lack precise pressure monitoring, making it difficult for operators to accurately assess the pressure within the balloon, thus impacting surgical accuracy and safety.

[0004] In addition, some pressure gauges are prone to air leakage at the connection with the injection tube, which not only affects the accuracy of the pressure gauge readings but also increases the risk of surgery and may cause unnecessary harm to the patient. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a digital display balloon expansion pressure pump. By employing a digital pressure gauge, the pump can display the pressure status inside the balloon in real time and accurately, providing the operator with intuitive feedback. The digital pressure gauge is connected to the injection tubing via a plug-in connection mechanism, ensuring airtightness between the two. This effectively avoids the air leakage problem that may occur at the connection between the pressure gauge and the injection tubing in traditional pressure pumps, further improving the accuracy of pressure readings and the safety of the surgery.

[0006] To achieve the above objectives, this utility model provides a digital display balloon inflation pressure pump, comprising an injection tube, a digital display pressure gauge, a self-locking mechanism, a piston, and a push rod.

[0007] One end of the injection tube is provided with a plug-in connection mechanism.

[0008] The digital pressure gauge is connected to the injection tube via the plug-in connection mechanism to ensure the airtightness of the connection between the digital pressure gauge and the injection tube.

[0009] The self-locking mechanism is located at the end of the injection tube furthest from the insertion / removal connection mechanism.

[0010] The piston is slidably disposed inside the injection tube.

[0011] The push rod extends into the injection tube via the self-locking mechanism and is used to drive the piston to slide along the injection tube.

[0012] Preferably, the insertion and removal connection mechanism includes a connecting tube communicating with the injection tube, the connecting tube being provided with a snap-fit ​​groove, a sealing groove, and a stop groove, and a sealing element being provided in the sealing groove.

[0013] The digital pressure gauge is provided with a connector that connects to the interior of the digital pressure gauge. The connector is provided with a connector portion, a sealing portion, and a limiting portion arranged sequentially from bottom to top.

[0014] The plug is inserted into the connecting tube, the plug portion abuts against the stop groove, the sealing portion presses the sealing element against the sealing groove, and the limiting portion is engaged with the engaging groove.

[0015] Preferably, the connecting pipe is further provided with a foolproof part, the plug is provided with a foolproof mating surface, the plug is connected to the connecting pipe, and the foolproof mating surface is in close contact with the foolproof part.

[0016] Preferably, the upper and lower ends of the snap-fit ​​groove are provided with glue-containing grooves. By injecting glue into the glue-containing grooves, the connection between the connecting pipe and the plug-in is made secure and air leakage is prevented.

[0017] Preferably, the self-locking mechanism includes a lock sleeve, a lock buckle, a reset element, and a trigger.

[0018] The locking sleeve is connected to the injection tube;

[0019] The latch is slidably connected to the lock sleeve, the reset member abuts between the latch and the lock sleeve, one end of the trigger is pivotally connected to the lock sleeve, and the other end of the trigger is pressed against the top of the latch;

[0020] The push rod is provided with a threaded section, and the upper and lower ends of the latch are respectively provided with a smooth part and a semi-threaded part;

[0021] When the trigger is released, the reset member pushes up the latch, the semi-threaded part abuts against the threaded section of the push rod, and the push rod is in a fine-tuning state;

[0022] When the trigger is pressed, the trigger compresses the reset member through the latch, the semi-threaded part separates from the threaded section of the push rod and is frictionally connected to the smooth part, and the push rod is in a quick-adjustment state.

[0023] Preferably, the lock sleeve has a support platform inside, the latch has a receiving groove inside, and the two ends of the reset member abut against the support platform and the receiving groove respectively;

[0024] The lock sleeve has a guide groove inside, and the outer side of the lock buckle slides along the guide groove.

[0025] Preferably, the locking sleeve has an opening that allows the trigger to be exposed on the outside of the locking sleeve, a pivot groove is provided on the inside of the opening, and a protrusion is provided on the outside of the trigger, the protrusion being rotatably connected to the pivot groove.

[0026] Preferably, the trigger is provided with a pressing recess, and an anti-slip strip is provided in the pressing recess.

[0027] Preferably, the end of the push rod is provided with a handle, which is crescent-shaped.

[0028] Preferably, the digital pressure gauge is equipped with a main control chip circuit, which includes a buzzer module and a pressure calibration module. Both the buzzer module and the pressure calibration module are electrically connected to the main control chip circuit. The buzzer module is equipped with a buzzer for producing sound, and the pressure calibration module is equipped with function buttons, an increase button, and a decrease button.

[0029] The beneficial effects of this invention are as follows: By employing a digital pressure gauge, this pressure pump can display the pressure status inside the balloon in real time and accurately, providing the operator with intuitive feedback information. This greatly improves the precision and safety of the surgery, allowing the operator to more accurately control the degree of balloon expansion, thereby ensuring the surgical outcome.

[0030] The digital pressure gauge connects to the injection tubing via a plug-in connection mechanism, a design that ensures airtightness between the two. This effectively avoids the air leakage problems that may occur at the connection between the pressure gauge and the injection tubing in traditional pressure pumps, further improving the accuracy of pressure readings and the safety of the procedure. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of this utility model.

[0032] Figure 2 This is a cross-sectional structural diagram of the present invention.

[0033] Figure 3 This is a schematic diagram of the digital pressure gauge and plug-in connection mechanism of this utility model.

[0034] Figure 4 This is a schematic diagram of the exploded state structure of the self-locking mechanism of this utility model.

[0035] Figure 5 This is a circuit diagram of the main control chip circuit of this utility model.

[0036] Figure 6 This is a circuit connection diagram of the main control chip circuit of this utility model.

[0037] Figure 7This is a circuit connection diagram of the buzzer module of this utility model.

[0038] Figure 8 This is a circuit connection diagram of the function keys, the add key, and the remove key of this utility model.

[0039] The reference numerals in the figures include:

[0040] 1. Injection tube; 2. Digital pressure gauge; 21. Connector; 211. Connector part; 212. Sealing part; 213. Limiting part; 214. Foolproof mating surface; 22. Main control chip circuit; 23. Buzzer module; 231. Buzzer; 24. Pressure calibration module; 241. Function button; 242. Increase button; 243. Decrease button; 3. Self-locking mechanism; 31. Locking sleeve; 311. Guide groove; 32. Locking buckle; 321. Smooth part; 322. Semi-threaded part; 323. 33. Reset part; 34. Trigger; 341. Protruding post; 342. Pressing recess; 343. Anti-slip strip; 35. Support platform; 351. Support plate; 352. Bearing plate; 36. Opening; 361. Pivot groove; 4. Piston; 5. Push rod; 51. Threaded section; 52. Handle; 6. Insertion and extraction connection mechanism; 61. Connecting pipe; 611. Snap-fit ​​groove; 612. Sealing groove; 613. Stop groove; 614. Seal; 615. Anti-fooling part; 616. Glue-concealing groove. Detailed Implementation

[0041] The present invention will now be described in detail with reference to the accompanying drawings.

[0042] See Figures 1 to 8 As shown, this utility model discloses a digital display balloon inflation pressure pump, comprising an injection tube 1, a digital display pressure gauge 2, a self-locking mechanism 3, a piston 4, and a push rod 5.

[0043] One end of the injection tube 1 is equipped with a plug-in connection mechanism 6.

[0044] The digital pressure gauge 2 is connected to the injection tube 1 via the plug-in connection mechanism 6 to ensure the airtightness of the connection between the digital pressure gauge 2 and the injection tube 1.

[0045] The self-locking mechanism 3 is located at the end of the injection tube 1 furthest from the insertion and removal connection mechanism 6.

[0046] Piston 4 is slidably disposed inside injection tube 1.

[0047] The push rod 5 extends into the injection tube 1 via the self-locking mechanism 3 and is used to drive the piston 4 to slide along the injection tube 1.

[0048] By employing a digital pressure gauge, the pressure pump can display the pressure status within the balloon in real time and accurately, providing the operator with intuitive feedback. This significantly improves the precision and safety of the surgery, allowing the operator to more accurately control the degree of balloon expansion, thereby ensuring the surgical outcome.

[0049] The digital pressure gauge 2 is connected to the injection tube 1 via a plug-in connection mechanism 6, a design that ensures airtightness between the two. This effectively avoids the air leakage problem that may occur at the connection between the pressure gauge and the injection tube 1 in traditional pressure pumps, further improving the accuracy of pressure readings and the safety of the surgery.

[0050] A self-locking mechanism 3 is installed at the end of the injection tube 1 furthest from the insertion / removal connection mechanism 6. This design effectively prevents the push rod 5 from sliding uncontrollably, thus avoiding sudden pressure changes caused by accidental operation. This not only improves the safety of the surgical procedure but also reduces the risks associated with operational errors.

[0051] The plug-in connection mechanism 6 makes connecting and disconnecting the digital pressure gauge 2 from the injection tube 1 simple and quick, without the need for complicated fixing or adjustment processes. At the same time, the sliding design of the push rod 5 and the piston 4 allows the operator to easily adjust the pressure, improving the efficiency and operability of the operation.

[0052] During operation, this digital display balloon expansion pressure pump effectively solves the problem of air leakage at the connection between the pressure gauge and the injection tube 1 in existing balloon expansion pressure pumps by adopting a high-precision digital display pressure gauge 2, a plug-in connection mechanism 6 to ensure airtightness, a self-locking mechanism 3 to enhance safety, and a push rod 5 and piston 4 for easy operation. This improves the accuracy and safety of the operation and has broad application prospects and important clinical significance.

[0053] See Figure 2 and Figure 3 As shown, the insertion and removal connection mechanism 6 of this embodiment includes a connecting tube 61 communicating with the injection tube 1. The connecting tube 61 is provided with a snap-fit ​​groove 611, a sealing groove 612, and a stop groove 613. A sealing element 614 is provided in the sealing groove 612.

[0054] The digital pressure gauge 2 is provided with a connector 21 that connects to the inside of the digital pressure gauge 2. The connector 21 is provided with a connector 211, a sealing part 212 and a limiting part 213 arranged sequentially from bottom to top.

[0055] The connector 21 is inserted into the connecting tube 61, the connector 211 abuts against the stop groove 613, the sealing part 212 presses the sealing member 614 against the sealing groove 612, and the limiting part 213 is engaged with the locking groove 611.

[0056] The insertion and removal connection mechanism 6, through its carefully designed sealing groove 612 and sealing element 614, as well as the sealing part 212 of the insertion piece 21, ensures the airtightness between the digital pressure gauge 2 and the injection tube 1. This design effectively prevents gas leakage, ensures the accuracy of pressure readings, and also reduces the risks during the surgical procedure.

[0057] The insertion part 211, sealing part 212, and limiting part 213 of the connector 21 cooperate with the stop groove 613, sealing groove 612, and snap-fit ​​groove 611 in the connecting pipe 61 to form a stable connection structure. This design not only enhances the stability of the connection but also avoids pressure fluctuations or reading errors caused by loose connections.

[0058] See Figure 3 As shown, the connecting pipe 61 in this embodiment is also provided with a foolproof part 615, and the plug-in 21 is provided with a foolproof mating surface 214. The plug-in 21 is connected to the connected pipe 61, and the foolproof mating surface 214 is in close contact with the foolproof part 615.

[0059] By adding a foolproof part 615 and a foolproof mating surface 214, the insertion and removal connection mechanism 6 achieves the function of preventing mis-insertion. Only when the foolproof mating surface 214 of the connector 21 is fully engaged with the foolproof part 615 of the connecting tube 61 can the connector 21 be smoothly inserted into the connecting tube 61. This design effectively avoids mis-insertion problems caused by improper operation or equipment confusion, improving the safety and accuracy of the surgery.

[0060] See Figure 3 As shown, the upper and lower ends of the snap-fit ​​groove 611 in this embodiment are provided with glue-containing grooves 616. By injecting glue into the glue-containing grooves 616, the connecting tube 61 and the plug 21 are firmly connected and air leakage is prevented.

[0061] By providing adhesive recesses 616 at the upper and lower ends of the snap-fit ​​groove 611 and injecting adhesive, the connection between the connecting pipe 61 and the plug-in 21 is made more secure. This design effectively prevents loosening of the connection due to improper operation or long-term use, and improves the durability and reliability of the equipment.

[0062] The adhesive injected into the adhesive reservoir 616 not only enhances the stability of the connection but also serves as a seal. The adhesive fills the tiny gap between the connecting tube 61 and the connector 21, thus preventing gas leakage. This design is crucial for maintaining the airtightness between the digital pressure gauge 2 and the injection tube 1, ensuring the accuracy of the pressure readings.

[0063] See Figure 4As shown, the self-locking mechanism 3 in this embodiment includes a locking sleeve 31, a locking buckle 32, a reset member 33, and a trigger 34. The locking sleeve 31 is connected to the injection tube 1, so that the self-locking mechanism 3 is connected to the end of the injection tube 1 away from the insertion and removal connection mechanism 6.

[0064] The latch 32 is slidably connected to the lock sleeve 31, the reset member 33 abuts against the latch 32 and the lock sleeve 31, one end of the trigger 34 is pivotally connected to the lock sleeve 31, and the other end of the trigger 34 is pressed against the top of the latch 32.

[0065] The push rod 5 is provided with a threaded section 51, and the upper and lower ends of the latch 32 are respectively provided with a smooth part 321 and a semi-threaded part 322;

[0066] When the trigger 34 is released, the reset piece 33 pushes up the latch 32, and the semi-threaded part 322 abuts against the threaded section 51 of the push rod 5, and the push rod 5 is in a fine-tuning state.

[0067] When the trigger 34 is pressed, the trigger 34 compresses the reset member 33 through the latch 32, the semi-threaded part 322 separates from the threaded section 51 of the push rod 5 and is frictionally connected to the smooth part 321, and the push rod 5 is in a quick-adjustment state.

[0068] The self-locking mechanism 3 controls the contact mode between the latch 32 and the push rod 5 via the trigger 34, realizing two adjustment modes: fine adjustment and quick adjustment. In fine adjustment mode, the semi-threaded part 322 is in close contact with the threaded section 51 of the push rod 5, allowing for fine adjustment of the pressure; in quick adjustment mode, the semi-threaded part 322 is in frictional contact with the smooth part 321 of the push rod 5, enabling the push rod 5 to move quickly and improving operating efficiency.

[0069] The trigger 34 is designed so that the operator can switch adjustment modes with a simple pressing or releasing action, without the need for additional tools or complicated procedures. This design reduces the difficulty of operation and improves the smoothness and safety of the surgery.

[0070] The reset element 33 provides continuous elastic force between the latch 32 and the locking sleeve 31, ensuring that the latch 32 automatically returns to the fine-tuning state when the trigger 34 is released. This design not only enhances the stability of the self-locking mechanism 3, but also avoids sudden pressure changes due to operational errors.

[0071] See Figure 4 As shown, the lock sleeve 31 of this embodiment is provided with a support platform 35 inside, the latch 32 is provided with a receiving groove 323 inside, and the two ends of the reset member 33 respectively abut against the support platform 35 and the receiving groove 323.

[0072] The lock sleeve 31 has a guide groove 311 inside, and the outer side of the latch 32 slides along the guide groove 311.

[0073] A support platform 35 is provided inside the lock sleeve 31 to provide a stable support point for the reset member 33. The reset member 33 can be one of a spring, a spring sheet, a rubber component, or a gas or liquid spring. In this embodiment, the reset member 33 is used as an example of a spring.

[0074] The guide groove 311 inside the lock sleeve 31 provides a clear path and direction for the sliding of the latch 32. This design reduces friction and resistance during the sliding process of the latch 32, allowing the latch 32 to slide more smoothly within the lock sleeve 31, thus improving the smoothness and efficiency of operation.

[0075] The two ends of the reset member 33 abut against the bearing plate 352 of the support platform 35 and the receiving groove 323 of the latch 32, respectively. This design ensures that the reset member 33 maintains a stable position and state when compressed or released. This not only improves the reliability of the self-locking mechanism 3, but also avoids operational errors caused by the failure of the reset member 33.

[0076] The design of the support platform 35 and the guide groove 311 makes the assembly of components such as the locking sleeve 31, the locking buckle 32, and the reset component 33 simpler and more intuitive. At the same time, this design also facilitates the maintenance and upkeep of the self-locking mechanism 3, reducing the maintenance cost and ease of use of the equipment.

[0077] Specifically, the support platform 35 includes a support plate 351 and a bearing plate 352. The support plate 351 is disposed at the bottom of the bearing plate 352 and connected to the inner wall of the lock sleeve 31. The support plate 351 is horizontally disposed inside the lock sleeve 31, and both ends of the support plate 351 are connected to the inner wall of the lock sleeve 31.

[0078] The support platform 35 is composed of a support plate 351 and a bearing plate 352. The combination of the two enhances the internal structural strength of the lock sleeve 31, making the self-locking mechanism 3 more stable when subjected to external forces and less prone to deformation or damage.

[0079] See Figure 4 As shown, the lock sleeve 31 of this embodiment is provided with an opening 36 that allows the trigger 34 to be exposed on the outside of the lock sleeve 31. A pivot groove 361 is provided on the inside of the opening 36, and a protrusion 341 is provided on the outside of the trigger 34. The protrusion 341 is rotatably connected to the pivot groove 361.

[0080] The opening 36 on the locking sleeve 31 allows the trigger 34 to be exposed on the outside, making it easily visible and operable by the operator. This design simplifies the operation process and improves ease of use and efficiency.

[0081] By rotatably connecting the protrusion 341 of the trigger 34 to the pivot groove 361 of the locking sleeve 31, a tight fit between the trigger 34 and the locking sleeve 31 is achieved. This design not only reduces the gap between components but also improves the compactness and stability of the overall structure.

[0082] See Figure 4 As shown, the trigger 34 in this embodiment is provided with a pressing recess 342, and an anti-slip strip 343 is provided inside the pressing recess 342.

[0083] The pressing recess 342 on the trigger 34 provides a comfortable pressing area for the operator's fingers. This design allows the operator's fingers to fit more naturally on the trigger 34 during prolonged operation or when greater force needs to be applied, reducing hand fatigue and discomfort.

[0084] The anti-slip strips 343 provided in the recess 342 further improve the anti-slip performance of the trigger 34. These anti-slip strips 343 are usually made of raised texture or rubber material, which can increase the friction between the finger and the trigger 34 and prevent slippage caused by factors such as hand sweat and oil during operation.

[0085] See Figure 1 and Figure 2 As shown, the end of the push rod 5 in this embodiment is provided with a handle portion 52, which is crescent-shaped.

[0086] The handle 52 at the end of the push rod 5 provides an easy-to-grip and operate part for the operator. The crescent-shaped handle 52 is ergonomically designed, allowing the operator to apply force more easily when rotating or pushing / pulling the push rod 5, reducing the difficulty of operation and hand fatigue.

[0087] The crescent-shaped handle 52 design is not only easy to grip, but also provides better stability. Its shape and size are carefully designed to ensure a natural fit between the operator's fingers and palm during operation, preventing operational errors or safety issues caused by an unstable grip.

[0088] See Figures 5 to 8 As shown, the digital pressure gauge 2 in this embodiment is equipped with a main control chip circuit 22. The main control chip circuit 22 is equipped with a buzzer module 23 and a pressure calibration module 24. Both the buzzer module 23 and the pressure calibration module 24 are electrically connected to the main control chip circuit 22. The buzzer module 23 is equipped with a buzzer 231 for sound generation. The pressure calibration module 24 is equipped with a function button 241, an increase button 242, and a decrease button 243.

[0089] The main control chip in the main control chip circuit 22 is model STC8H.

[0090] The main control chip circuit 22 inside the digital pressure gauge 2 integrates a buzzer module 23, which can automatically trigger the buzzer 231 to sound when the air pressure reaches a preset threshold or is abnormal, promptly reminding the operator. This intelligent monitoring and prompting function enhances the safety and reliability of the equipment and effectively avoids potential risks caused by abnormal air pressure.

[0091] The pressure calibration module 24 allows operators to precisely calibrate the pressure gauge using function keys 241, increase key 242, and decrease key 243. This function not only improves the measurement accuracy of the pressure gauge but also facilitates equipment calibration and maintenance, ensuring the accuracy and consistency of measurement results.

[0092] Specifically, the buzzer module 23 drives the transistor with a 2.7kHz voltage signal, causing the D and S circuits in the buzzer module 23 to conduct, thereby making the buzzer 231 sound. The function button 241 has start, pause, and function switch buttons. The buzzer module 23 also has a timing module, which is used to control the timing operation of the buzzer module 23. When setting the timing function, each press of the increase button 242 increases the time by 30 seconds, and each press of the decrease button 243 decreases the time by 30 seconds.

[0093] The specific method for air pressure calibration is as follows: Press function button 241 and increase button 242 simultaneously. The character "S" will be displayed in the lower left corner of the display screen. Then release function button 241 and increase button 242. Then, according to the air pressure at that time, press increase button 242 or decrease button 243 to perform calibration. The zeroing step is 0.05 units. After calibration, press function button 241 again. The character "S" on the display screen will not light up, indicating that the calibration is complete.

[0094] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. A digital balloon inflation pressure pump characterized by: It includes an injection tube (1), a digital pressure gauge (2), a self-locking mechanism (3), a piston (4), and a push rod (5). One end of the injection tube (1) is provided with a plug-in connection mechanism (6). The digital pressure gauge (2) is connected to the injection tube (1) through the plug-in connection mechanism (6) to confirm the airtightness of the connection between the digital pressure gauge (2) and the injection tube (1); The self-locking mechanism (3) is located at the end of the injection tube (1) away from the insertion and removal connection mechanism (6). The piston (4) is slidably disposed inside the injection tube (1). The push rod (5) extends into the injection tube (1) through the self-locking mechanism (3) and is used to drive the piston (4) to slide along the injection tube (1); The insertion and removal connection mechanism (6) includes a connecting tube (61) communicating with the injection tube (1). The connecting tube (61) is provided with a snap-fit ​​groove (611), a sealing groove (612) and a stop groove (613). A sealing element (614) is provided in the sealing groove (612). The digital pressure gauge (2) is provided with a connector (21) that connects to the inside of the digital pressure gauge (2). The connector (21) is provided with a connector (211), a sealing part (212) and a limiting part (213) in sequence from bottom to top. The plug (21) is inserted into the connecting tube (61), the plug (211) abuts against the stop groove (613), the sealing part (212) presses the sealing member (614) against the sealing groove (612), and the limiting part (213) is engaged with the locking groove (611). The connecting pipe (61) is also provided with a foolproof part (615), and the plug (21) is provided with a foolproof mating surface (214). The plug (21) is connected to the connecting pipe (61), and the foolproof mating surface (214) is in close contact with the foolproof part (615).

2. The digital display balloon expansion pressure pump according to claim 1, characterized in that: The upper and lower ends of the snap-fit ​​groove (611) are provided with glue-containing grooves (616). By injecting glue into the glue-containing grooves (616), the connecting pipe (61) and the plug (21) are firmly connected and air leakage is prevented.

3. The digital display balloon expansion pressure pump according to claim 1, characterized in that: The self-locking mechanism (3) includes a lock sleeve (31), a latch (32), a reset component (33), and a trigger (34). The locking sleeve (31) is connected to the injection tube (1); The latch (32) is slidably connected to the lock sleeve (31), the reset member (33) abuts against the latch (32) and the lock sleeve (31), one end of the trigger (34) is pivotally connected to the lock sleeve (31), and the other end of the trigger (34) is pressed against the top of the latch (32); The push rod (5) is provided with a threaded section (51), and the upper and lower ends of the latch (32) are respectively provided with a smooth part (321) and a semi-threaded part (322). When the trigger (34) is released, the reset member (33) pushes up the latch (32), the semi-threaded part (322) abuts against the threaded section (51) of the push rod (5), and the push rod (5) is in a fine-tuning state; When the trigger (34) is pressed, the trigger (34) compresses the reset member (33) through the latch (32), the semi-threaded part (322) separates from the threaded section (51) of the push rod (5) and is rubbed connected to the smooth part (321), and the push rod (5) is in a quick-adjustment state.

4. A digital display balloon expansion pressure pump according to claim 3, characterized in that: The lock sleeve (31) is provided with a support platform (35) inside, the lock buckle (32) is provided with a receiving groove (323) inside, and the two ends of the reset member (33) respectively abut against the support platform (35) and the receiving groove (323); The lock sleeve (31) has a guide groove (311) inside, and the outer side of the buckle (32) slides along the guide groove (311).

5. A digital display balloon expansion pressure pump according to claim 3 or 4, characterized in that: The lock sleeve (31) is provided with an opening (36) that allows the trigger (34) to be exposed on the outside of the lock sleeve (31). A pivot groove (361) is provided on the inside of the opening (36), and a protrusion (341) is provided on the outside of the trigger (34). The protrusion (341) is rotatably connected to the pivot groove (361).

6. A digital display balloon expansion pressure pump according to claim 3 or 4, characterized in that: The trigger (34) is provided with a pressing recess (342), and an anti-slip strip (343) is provided in the pressing recess (342).

7. A digital display balloon expansion pressure pump according to claim 1, characterized in that: The end of the push rod (5) is provided with a handle (52), which is crescent-shaped.

8. A digital display balloon expansion pressure pump according to claim 1, characterized in that: The digital pressure gauge (2) is equipped with a main control chip circuit (22). The main control chip circuit (22) is equipped with a buzzer module (23) and a pressure calibration module (24). The buzzer module (23) and the pressure calibration module (24) are both electrically connected to the main control chip circuit (22). The buzzer module (23) is equipped with a buzzer (231) for making a sound. The pressure calibration module (24) is equipped with a function button (241), an increase button (242), and a decrease button (243).

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