A precise speed-controlled medical extended injection device

Abstract

The present invention relates to the field of angiography technology, and in particular to a precise speed-controlled medical extended injection device, comprising a shell, an injection tube with a valve and an air inlet pipe connected to the upper end of the shell, a gas storage tank and two injection tanks are arranged inside the shell, the air inlet pipe is connected to the inner side of the gas storage tank, the inner side of the shell is located below the two injection tanks and is rotatably connected to a hollow shaft, and a first gear is fixed to one end of the outer side of the two hollow shafts. The present invention can adjust the connection position of the injection connecting rod and the first gear in real time through a contact adjustment mechanism. When the connection position is close to the edge of the first gear, the movement stroke of the piston can be increased, thereby increasing the injection flow rate. When the connection position is close to the center of the first gear, the movement stroke of the piston can be reduced, thereby reducing the injection flow rate. Medical staff can flexibly adjust the carbon dioxide injection flow rate according to the state of the patient's veins.

Description

Technical Field

[0001] The invention relates to the technical field of angiography, and in particular to a medical extended injection device with precise speed control. Background Art

[0002] Since carbon dioxide exists naturally in the human body, it has good biocompatibility, can be dissolved in the blood, can be exhaled through breathing, and is non-toxic to the liver and kidneys, it is often used as a contrast agent for vascular radiography.

[0003] After searching, a Chinese patent with publication number: CN221266822U discloses a carbon dioxide radiography device, including a propeller, a three-way valve and a clamping ring. The propeller includes a cylinder and a propeller. One end of the cylinder is provided with a flange portion, and the other end is provided with an injection port connected to the air cavity; the three-way valve can switch the conduction state to connect the air inlet pipe and the air cavity, or connect the air cavity and the radiography catheter; the clamping ring includes a ring body and a clamping block, the ring body and the flange portion are slidably matched and slide in the horizontal direction, the ring body is connected to the clamping block through a connecting portion, and a push rod is provided with a clamping groove, and the clamping groove and the clamping block are clamped together. When the pressure in the air cavity is greater than the preset pressure, the push rod moves radially away from the three-way valve of the cylinder to break the connecting portion, such as Fig. 9 shown.

[0004] Based on the above search and combined with actual problems: Although the existing injection device has a simple structure and low manufacturing cost, the carbon dioxide gas is introduced into the cylinder through the air inlet pipe, and then the carbon dioxide in the cylinder is introduced into the human blood vessels through the angiography catheter by adjusting the two-way stopcock, wherein the cylinder provides a transit for the high-pressure carbon dioxide gas to prevent the high-pressure gas from directly entering the blood vessels and causing vascular damage. However, there are still great limitations in use. It is difficult for medical staff to manually adjust the injection volume. Therefore, the injection device cannot accurately control the carbon dioxide injection volume during the injection process. When the injection speed needs to be slowed down, the pressing force needs to be reduced, which can easily lead to interruption of the injection and affect the angiography effect. When the injection speed needs to be increased, the pressing force needs to be increased, which can easily lead to excessive injection volume, causing discomfort to the patient and even damage to the blood vessels. Summary of the invention

[0005] The object of the present invention is to provide a medical extended injection device with precise speed control to solve the problems raised in the above background technology.

[0006] The technical solution of the present invention is: a precise speed-controlled medical extended injection device, comprising a shell, the upper end of which is connected to an injection tube with a valve and an air inlet pipe, and the lower end of the shell 1 is provided with an opening, an air storage tank and two injection tanks are provided inside the shell, the air inlet pipe is connected to the inner side of the air storage tank, the inner side of the shell is located below the two injection tanks and is rotatably connected with a hollow rotating shaft, the outer ends of the two hollow rotating shafts are fixed with a first gear, one side of the two first gears can be adjustably and movably provided with an injection connecting rod, the inner sides of the two injection tanks are slidably connected with pistons, and the upper ends of the two injection connecting rods are rotatably connected to the lower ends of the two pistons respectively; an injection pushing mechanism is also provided between the two hollow rotating shafts and the shell, and one end of the air inlet pipe is connected with an extension tube.

[0007] Preferably, an adjustment groove is provided on one side of the two first gears, and an adjustment block is slidably connected to the inner side of the two adjustment grooves. The lower ends of the two injection connecting rods are respectively rotatably connected to one side of the two adjustment blocks, and a contact adjustment mechanism is arranged between the two adjustment blocks, the two hollow rotating shafts and the shell.

[0008] Preferably, the contact adjustment mechanism includes a screw rotatably connected to the outside of the shell, two sliders slidably connected to the inner sides of the two hollow rotating shafts, one side of the two sliders are rotatably connected to an adjustment connecting rod extending to the outside of the hollow rotating shaft, one end of the two adjustment connecting rods are respectively rotatably connected to one side of the two adjustment blocks, one end of the two sliders are rotatably connected to a push-pull rod extending to the outside of the shell, one end of the two push-pull rods is fixed with a cross bar located on the outside of the shell, and the screw is rotatably connected to the inside of the cross bar through a thread.

[0009] Preferably, the injection pushing mechanism includes two guide rods fixed on the inner side of the shell, and two second gears arranged on the outside of the two hollow rotating shafts. The outer sliding sleeves of the two guide rods are provided with a rectangular frame, and two racks are symmetrically provided on both sides of the rectangular frame. The upper end of the rectangular frame is connected to a reset spring sleeved on the outside of the two guide rods, and the two racks are respectively meshed with the second gears at corresponding positions through teeth. An injection push rod is fixed to the lower end of the rectangular frame, and a fixed handle is fixed to one side of the lower end of the shell.

[0010] Preferably, the two second gears are rotatably connected to the outer sides of the hollow rotating shafts at corresponding positions through one-way bearings.

[0011] Preferably, a plurality of circumferentially arranged locking rubber blocks are disposed on the inner side of each of the second gears, and the inner surface of each of the locking rubber blocks is in close contact with the outer side of the one-way bearing at the corresponding position.

[0012] Preferably, the inner side of the shell is rotatably connected to two synchronous shafts at a position between the two first gears, and synchronous gears are fixed to the outer sides of the two synchronous shafts. The two synchronous gears are meshed with each other, and the other sides of the two synchronous gears are respectively meshed with the first gears at corresponding positions.

[0013] Preferably, the upper ends of the two injection tanks are connected to the interior of the gas storage tank through a connecting pipe, and the inner sides of the two connecting pipes are provided with a first one-way valve with the conducting direction pointing to the inner side of the injection tank.

[0014] Preferably, one end of the injection tube is connected to the interior of two injection tanks through a three-way pipe, and second one-way valves are provided at both ends of the inner side of the three-way pipe, and the conducting directions of the two second one-way valves are both directed to the inside of the three-way pipe.

[0015] Preferably, the extension tube is a telescopic bellows.

[0016] The present invention provides a precise speed-controlled medical extended injection device through improvements, which has the following improvements and advantages compared with the prior art:

[0017] First, the present invention drives the two hollow rotating shafts to rotate in opposite directions through the injection pushing mechanism, thereby driving the two pistons to move up and down alternately, so that the carbon dioxide inside the two injection tanks is alternately injected into the human veins. At the same time, the connection position between the injection connecting rod and the first gear can be adjusted in real time through the contact adjustment mechanism. When the connection position is close to the edge of the first gear, the movement stroke of the piston can be increased, thereby increasing the injection flow rate. When the connection position is close to the center of the first gear, the movement stroke of the piston can be reduced, thereby reducing the injection flow rate. Medical staff can adjust the carbon dioxide injection flow rate more accurately according to the state of the patient's vein during the injection process, which can avoid injection interruption or excessive injection amount due to improper control of the pressing force, thereby avoiding affecting the angiography effect or damaging the patient's blood vessels.

[0018] Secondly, the present invention provides a plurality of circumferentially arranged locking rubber blocks on the inner side of the second gear, and the inner surface of each locking rubber block is in close contact with the outer side of the hollow rotating shaft at the corresponding position. If the medical staff applies excessive pressure to the rectangular frame of the injection pushing mechanism, the force acting on the outer side of the second gear will be greater. When the force acting on the second gear is greater than the maximum static friction between the locking rubber block and the outer side of the one-way bearing, the locking rubber block and the outer side of the one-way bearing will slide, so that the torsional moment transmitted from the second gear to the hollow rotating shaft can be greatly reduced, thereby reducing the force acting on the hollow rotating shaft, thereby reducing the rotation speed of the hollow rotating shaft, thereby reducing the speed of the piston moving up and down, reducing the injection flow of carbon dioxide, and then reducing the injection pressure of carbon dioxide into the human vein, reducing the patient's discomfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0021] Figure 2 It is a schematic diagram of the structure inside the shell of the present invention;

[0022] Figure 3 It is a first cross-sectional structural schematic diagram of the present invention;

[0023] Figure 4 For the present invention Figure 3 A schematic diagram of the enlarged structure at A in the middle;

[0024] Figure 5 It is a second cross-sectional structural schematic diagram of the present invention;

[0025] Figure 6 For the present invention Figure 5 A schematic diagram of the enlarged structure at B in the middle;

[0026] Figure 7 It is a third cross-sectional structural schematic diagram of the present invention;

[0027] Figure 8 For the present invention Figure 7 Schematic diagram of the enlarged structure at C in the middle;

[0028] Fig. 9 The structure diagram of the carbon dioxide angiography device in the prior art.

[0029] Reference numerals:

[0030] 1. Shell; 2. Injection tube; 3. Intake pipe; 4. Tee pipe; 5. Air storage tank; 6. Injection tank; 7. Connecting pipe; 8. Piston; 9. Injection connecting rod; 10. Hollow shaft; 11. First gear; 12. Synchronous shaft; 13. Synchronous gear; 14. One-way bearing; 15. Locking rubber block; 16. Injection push rod; 17. Fixed handle; 18. Extension tube; 101. Guide rod; 102. Rectangular frame; 103. Rack; 104. Return spring; 105. Second gear; 201. Adjustment slot; 202. Adjustment block; 203. Slider; 204. Adjustment connecting rod; 205. Push-pull rod; 206. Screw; 207. Cross bar. DETAILED DESCRIPTION

[0031] The present invention is described in detail below, and the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] The present invention provides a precise speed-controlled medical extended injection device through improvement. The technical solution of the present invention is:

[0033] like Figures 1 to 8 As shown, an embodiment of the present invention provides a precise speed-controlled medical extended injection device, comprising a housing 1, an injection tube 2 with a valve and an air inlet pipe 3 are connected to the upper end of the housing 1, and an opening is provided at the lower end of the housing 1, an air storage tank 5 and two injection tanks 6 are provided inside the housing 1, the air inlet pipe 3 is communicated with the inner side of the air storage tank 5, a hollow shaft 10 is rotatably connected to the inner side of the housing 1 below the two injection tanks 6, a first gear 11 is fixed to one end of the outer side of the two hollow shafts 10, and one end of the two first gears 11 is fixed to the outer side of the two hollow shafts 10. An injection connecting rod 9 is adjustably and movably arranged on both sides, and pistons 8 are slidably connected to the inner sides of the two injection tanks 6, and the upper ends of the two injection connecting rods 9 are rotatably connected to the lower ends of the two pistons 8 respectively; an injection pushing mechanism is also arranged between the two hollow rotating shafts 10 and the shell 1, and the angles of the two first gears 11 are equal and the rotation directions are opposite, so that the two pistons 8 can be driven to move up and down alternately, so that the two injection tanks 6 can alternately press carbon dioxide gas into the inner side of the injection tube 2, and one end of the air inlet pipe 3 is connected to an extension tube 18.

[0034] Furthermore, one side of the two first gears 11 is provided with an adjustment groove 201, the inner sides of the two adjustment grooves 201 are slidably connected with adjustment blocks 202, the lower ends of the two injection connecting rods 9 are respectively rotatably connected to one side of the two adjustment blocks 202, and a contact adjustment mechanism is provided between the two adjustment blocks 202, the two hollow rotating shafts 10 and the housing 1;

[0035] The adjusting block 202 can slide inside the adjusting groove 201 to adjust the position of the connection point between the adjusting block 202 and the lower end of the injection connecting rod 9 and the distance between the connection point and the center of the first gear 11 , thereby adjusting the stroke of the adjusting piston 8 .

[0036] Further, the contact adjustment mechanism includes a screw 206 rotatably connected to the outside of the shell 1, two sliders 203 slidably connected to the inside of the two hollow shafts 10, one side of the two sliders 203 is rotatably connected to an adjustment link 204 extending to the outside of the hollow shaft 10, one end of the two adjustment links 204 is rotatably connected to one side of the two adjustment blocks 202 respectively, one end of the two sliders 203 is rotatably connected to a push-pull rod 205 extending to the outside of the shell 1, one end of the two push-pull rods 205 is commonly fixed with a cross bar 207 located on the outside of the shell 1, and the screw 206 is rotatably connected to the inside of the cross bar 207 through a thread.

[0037] Through the contact adjustment mechanism, the position of the adjustment block 202 inside the adjustment groove 201 can be adjusted during injection, thereby adjusting the movement stroke of the piston 8, so that medical staff can adjust the injection amount of carbon dioxide in real time according to the patient's venous condition during injection, so that the carbon dioxide injection amount is maintained within the specified range, avoiding the injection speed being too slow, resulting in poor development effect, or the injection speed being too fast, resulting in patient discomfort or venous damage.

[0038] Furthermore, the injection push mechanism includes two guide rods 101 fixed on the inner side of the shell 1, and two second gears 105 arranged on the outer sides of the two hollow rotating shafts 10. The outer sides of the two guide rods 101 are slidably sleeved with a rectangular frame 102. Two racks 103 are symmetrically arranged on both sides of the rectangular frame 102, and the upper end of the rectangular frame 102 is connected with a return spring 104 sleeved on the outer sides of the two guide rods 101. The two racks 103 are respectively meshed with the second gears 105 at the corresponding positions through teeth. The two second gears 105 are respectively rotatably connected to the outer sides of the hollow rotating shafts 10 at the corresponding positions through one-way bearings 14. A plurality of circumferentially arranged locking rubber blocks 15 are arranged on the inner side of each second gear 105, and the inner side surface of each locking rubber block 15 is tightly attached to the outer side of the one-way bearing 14 at the corresponding position. An injection push rod 16 is fixed to the lower end of the rectangular frame 102, and a fixed handle 17 is fixed to one side of the lower end of the shell 1.

[0039] When the two racks 103 move toward the direction of the opening of the shell 1, the one-way bearing 14 will not be locked, so that the two racks 103 can only drive the two second gears 105 to rotate, and the two second gears 105 will not drive the two hollow shafts 10 to rotate. Therefore, only when the rectangular frame 102 moves toward the inside of the shell 1, it can drive the two hollow shafts 10 to rotate in the opposite direction. When the two rectangular frames 102 move outward, they will not drive the two hollow shafts 10 to rotate. When the rectangular frame 102 is pressed to the uppermost end of the inner side of the shell 1, the rectangular frame 102 can be pushed to move in the opposite direction and reset under the action of the reset spring 104, which is convenient for medical staff to repeatedly press the rectangular frame 102, thereby improving the operating convenience and facilitating medical staff to better control the amount of carbon dioxide injection.

[0040] Furthermore, the inner side of the housing 1 is rotatably connected to two synchronization shafts 12 located between the two first gears 11, and synchronization gears 13 are fixed to the outer sides of the two synchronization shafts 12. The two synchronization gears 13 are meshed with each other, and the other sides of the two synchronization gears 13 are respectively meshed with the first gears 11 at the corresponding positions;

[0041] The two first gears 11 rotate in opposite directions and respectively drive the two synchronous gears 13 to rotate. The two synchronous gears 13 are meshed with each other through teeth, so that the two first gears 11 keep rotating in opposite directions while the angular velocity of rotation remains unchanged. Since the inner sides of the two second gears 105 are pressed against the outer side of the one-way bearing 14 through the locking rubber block 15, the two second gears 105 are both subjected to the thrust of the two racks 103. When the thrust of the two racks 103 is too large, theoretically, the locking rubber blocks 15 on the inner sides of the two second gears 105 slide against the outer side of the one-way bearing 14 at the same time, but in fact, the two slide one after another. In order to prevent the locking rubber block 15 on the inner side of one of the second gears 105 from sliding, resulting in different rotation speeds of the two second gears 105, two synchronous gears 13 are set for constraint, thereby ensuring that the two first gears 11 keep rotating in opposite directions while the angular velocity of rotation remains unchanged, and the rhythm of the two pistons 8 reciprocating up and down is disrupted, so that the two pistons 8 are guaranteed to move up and down alternately, so that the carbon dioxide is alternately pressed into the injection tube 2.

[0042] Furthermore, the upper ends of the two injection tanks 6 are connected to the inside of the gas storage tank 5 through the connecting pipe 7, and the inner sides of the two connecting pipes 7 are provided with a first one-way valve with the conducting direction pointing to the inner side of the injection tank 6;

[0043] The first one-way valve allows the carbon dioxide gas inside the gas storage tank 5 to flow to the inside of the injection tank 6 only through the connecting pipe 7. When the two pistons 8 move downward, the carbon dioxide gas inside the gas storage tank 5 can be sucked into the inside of the two injection tanks 6 through the two connecting pipes 7.

[0044] Furthermore, one end of the injection tube 2 is connected to the inside of the two injection tanks 6 through the three-way tube 4, and the two ends of the inner side of the three-way tube 4 are provided with a second one-way valve, and the conduction direction of the two second one-way valves is directed to the inside of the three-way tube 4;

[0045] When the carbon dioxide gas in the injection tank 6 is squeezed by the piston 8 , it flows toward the inside of the three-way pipe 4 through the second one-way valve and enters the injection tube 2 .

[0046] Furthermore, the extension tube 18 is a retractable bellows, which can extend the length of the air inlet pipe 3, thereby facilitating the introduction of carbon dioxide gas from a distant gas source into the injection device, thereby ensuring long-distance and stable transmission of carbon dioxide gas.

[0047] Working principle: When in use, first connect one end of the air inlet pipe 3 to the carbon dioxide gas source, open the valve on the air inlet pipe 3, allow the carbon dioxide gas to be filled into the inner side of the gas storage tank 5 through the air inlet pipe 3, and then close the valve on the air inlet pipe 3. When injecting into the human body, insert one end of the injection tube 2 into the human vein through the injection needle, and then open the valve on the injection tube 2;

[0048] During injection, the injection push rod 16 is pushed, and the injection push rod 16 pushes the rectangular frame 102 of the injection pushing mechanism to move along the guide rod 101 toward the inner side of the housing 1, and the rectangular frame 102 drives the two racks 103 on both sides to move, and the two racks 103 drive the two second gears 105 to rotate in the opposite direction at the same speed through the teeth. Since the two second gears 105 are respectively connected to the outer sides of the hollow rotating shaft 10 at the corresponding positions through the one-way bearings 14, when the two racks 103 move toward the inner side of the housing 1, they drive the two second gears 105 to rotate in the opposite direction. At this time, the one-way bearings 14 are locked in one direction, and the two second gears 105 can drive the two hollow rotating shafts 10 to rotate in the opposite direction through the one-way bearings 14. The two hollow rotating shafts 10 are The two first gears 11 are driven to rotate in opposite directions. When the two first gears 11 rotate, the two pistons 8 are driven to move up and down reciprocatingly through the two injection connecting rods 9. When the two pistons 8 move down, the carbon dioxide gas inside the gas storage tank 5 can be sucked into the inner side of the two injection tanks 6 through the two connecting tubes 7. When the two pistons 8 move up, the carbon dioxide inside the injection tank 6 can be pressed into the inner side of the three-way pipe 4, and then injected into the human vein through the injection tube 2 to realize the injection operation of carbon dioxide. The angles of the two first gears 11 are equal and the rotation directions are opposite, so that the two pistons 8 can be driven to move up and down alternately, so that the two injection tanks 6 can press the carbon dioxide gas into the inner side of the three-way pipe 4 alternately.

[0049] When the two racks 103 move toward the direction of the opening of the housing 1, the one-way bearing 14 will not be locked, so that the two racks 103 can only drive the two second gears 105 to rotate, and the two second gears 105 will not drive the two hollow shafts 10 to rotate. Therefore, only when the rectangular frame 102 moves toward the inside of the housing 1, the two hollow shafts 10 can be driven to rotate in the opposite direction. When the two rectangular frames 102 move outward, the two hollow shafts 10 will not be driven to rotate. When the rectangular frame 102 is pressed into the uppermost end of the inner side of the housing 1, the rectangular frame 102 can be pushed to move in the opposite direction and reset under the action of the reset spring 104, thereby improving the convenience of operation.

[0050] During the injection process, the medical staff needs to adjust the carbon dioxide injection flow rate in real time. The medical staff only needs to continuously apply thrust to the rectangular frame 102 and rotate the screw 206 of the contact adjustment mechanism at the same time. The screw 206 rotates through the thread to drive the cross bar 207 to move. The movement of the cross bar 207 drives the two push-pull rods 205 to move on the inner side of the hollow shaft 10. The two push-pull rods 205 can push the two sliders 203 to slide on the inner side of the hollow shaft 10. When the slider 203 moves to the end close to the first gear 11, the slider 203 pushes the adjustment block 202 to move to the end of the adjustment slot 201 close to the edge of the first gear 11 through the adjustment connecting rod 204, so that the connection point position of the injection connecting rod 9 and the adjustment block 202 is close to the first gear. When the slider 203 moves in the opposite direction, the connection point between the injection connecting rod 9 and the adjusting block 202 is close to the center of the first gear 11, thereby reducing the movement stroke of the piston 8 and reducing the injection flow of the carbon dioxide, which is convenient for medical staff to accurately adjust the injection amount of carbon dioxide according to the patient's venous condition during injection, so that the injection amount of carbon dioxide is maintained within the specified range, avoiding too slow injection speed or injection interruption, resulting in poor imaging effect, or too fast injection speed, resulting in patient discomfort or venous damage;

[0051] In order to prevent medical staff from injecting too much carbon dioxide and causing discomfort to the patient, a plurality of locking rubber blocks 15 are arranged in a circumferential manner on the inner side of the second gear 105, and the inner surface of each locking rubber block 15 is in close contact with the outer side of the hollow shaft 10 at the corresponding position. If the medical staff applies too much pressure to the rectangular frame 102 of the injection pushing mechanism, the force acting on the outer side of the second gear 105 will be greater. When the force acting on the second gear 105 is greater than the maximum static friction between the locking rubber block 15 and the outer side of the one-way bearing 14, the locking rubber block 15 and the outer side of the one-way bearing 14 will slide, so that the torsional moment transmitted by the second gear 105 to the hollow shaft 10 can be greatly reduced, thereby reducing the force acting on the hollow shaft 10, thereby reducing the rotation speed of the hollow shaft 10, thereby reducing the speed of the up and down movement of the piston 8, reducing the injection flow of carbon dioxide, and then reducing the injection pressure of carbon dioxide to the human vein, reducing the patient's discomfort, and avoiding damage to the patient's vein due to excessive injection pressure.

[0052] The above description enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A precise speed-controlled medical extended injection device, comprising a housing (1), the upper end of the housing (1) being connected to an injection tube (2) with a valve and an air inlet tube (3), and the lower end of the housing (1) being provided with an opening, characterized in that: An air storage tank (5) and two injection tanks (6) are arranged inside the shell (1); the air inlet pipe (3) is connected to the inner side of the air storage tank (5); a hollow rotating shaft (10) is rotatably connected to the inner side of the shell (1) below the two injection tanks (6); a first gear (11) is fixed to one end of the outer side of the two hollow rotating shafts (10); an injection connecting rod (9) is movably and adjustably arranged on one side of the two first gears (11); a piston (8) is slidably connected to the inner side of the two injection tanks (6); and the upper ends of the two injection connecting rods (9) are rotatably connected to the lower ends of the two pistons (8) respectively; An injection pushing mechanism is also provided between the two hollow rotating shafts (10) and the housing (1); One end of the air inlet pipe (3) is connected to an extension pipe (18); One side of the two first gears (11) is provided with an adjustment groove (201), the inner sides of the two adjustment grooves (201) are slidably connected with an adjustment block (202), the lower ends of the two injection connecting rods (9) are respectively rotatably connected to one side of the two adjustment blocks (202), and a contact adjustment mechanism is provided between the two adjustment blocks (202), the two hollow rotating shafts (10) and the housing (1); The contact adjustment mechanism comprises a screw (206) rotatably connected to the outside of the shell (1), and two sliders (203) slidably connected to the inside of the two hollow rotating shafts (10); one side of the two sliders (203) is rotatably connected to an adjustment connecting rod (204) extending to the outside of the hollow rotating shaft (10); one end of the two adjustment connecting rods (204) is rotatably connected to one side of two adjustment blocks (202) respectively; one end of the two sliders (203) is rotatably connected to a push-pull rod (205) extending to the outside of the shell (1); one end of the two push-pull rods (205) is fixed to a cross bar (207) located outside the shell (1); and the screw (206) is rotatably connected to the inside of the cross bar (207) by threading; The injection push mechanism comprises two guide rods (101) fixed on the inner side of the housing (1), and two second gears (105) arranged on the outer sides of the two hollow rotating shafts (10); a rectangular frame (102) is slidably sleeved on the outer sides of the two guide rods (101); two racks (103) are symmetrically arranged on both sides of the rectangular frame (102); and the upper end of the rectangular frame (102) is connected to a return spring (104) sleeved on the outer sides of the two guide rods (101); the two racks (103) are respectively meshed with the second gears (105) at corresponding positions through teeth; an injection push rod (16) is fixed to the lower end of the rectangular frame (102); and a fixed handle (17) is fixed to one side of the lower end of the housing (1).

2. The precise speed-controlled medical extended injection device according to claim 1, characterized in that: The two second gears (105) are rotatably connected to the outer sides of the hollow rotating shafts (10) at corresponding positions via one-way bearings (14).

3. The precise speed-controlled medical extended injection device according to claim 2, characterized in that: A plurality of circumferentially arranged locking rubber blocks (15) are provided on the inner side of each second gear (105), and the inner surface of each locking rubber block (15) is in close contact with the outer side of the one-way bearing (14) at the corresponding position.

4. The precise speed-controlled medical extended injection device according to claim 1, characterized in that: The inner side of the housing (1) is rotatably connected to two synchronizing shafts (12) located between the two first gears (11); synchronizing gears (13) are fixed to the outer sides of the two synchronizing shafts (12); the two synchronizing gears (13) are meshed with each other, and the other sides of the two synchronizing gears (13) are respectively meshed with the first gears (11) at corresponding positions.

5. The precise speed-controlled medical extended injection device according to claim 1, characterized in that: The upper ends of the two injection tanks (6) are connected to the interior of the gas storage tank (5) through a connecting pipe (7), and the inner sides of the two connecting pipes (7) are provided with a first one-way valve with the conducting direction pointing to the inner side of the injection tank (6).

6. The precise speed-controlled medical extended injection device according to claim 5, characterized in that: One end of the injection tube (2) is connected to the interior of two injection tanks (6) respectively through a three-way tube (4), and second one-way valves are provided at both ends of the inner side of the three-way tube (4), and the conduction directions of the two second one-way valves are both directed to the inner side of the three-way tube (4).

7. The precise speed-controlled medical extended injection device according to claim 1, characterized in that: The extension tube (18) is a retractable bellows.

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