Integrated drawing and pushing intravenous syringe assembly

Abstract

The present invention relates to the technical field of medical devices, and particularly to an integrated suction and push intravenous syringe assembly, including a syringe and a suction and push device; the suction and push device includes a semi-cylindrical barrel and a housing, a guide groove is provided on the lower side of the semi-cylindrical barrel, a sliding plate is slidably connected to the inner side of the guide groove, a first slide bar and a second slide bar are symmetrically and slidably connected to the inner side of the housing, reversing racks are fixed to the sides of the first slide bar and the second slide bar, and a reversing gear meshing with the two reversing racks is rotatably connected to the housing. Through the mutual cooperation of the commutation mechanism and the suction and push device, when medical staff frequently aspirate and inject liquid medicine during the medicine preparation process, only a single hand needs to repeat the same action to complete two opposite actions of suction and push, without directly using the hand to push and pull the piston rod of the syringe, greatly reducing the operation difficulty of the syringe. Medical staff can operate the syringe more conveniently with a single hand, improving the medicine preparation efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to an integrated push-pull intravenous syringe assembly. Background Art

[0002] Medical syringes are a commonly used type of medical device in the medical and health system, mainly used for injecting liquid drugs into patients. At the same time, when medical staff prepare drugs, syringes are also needed to mix different types of drugs in different proportions to form the required liquid medicine.

[0003] After retrieval, a Chinese patent with the publication number: CN117982754A discloses a medical syringe, which includes a syringe barrel. An outer wall of the syringe barrel is fixedly assembled with a syringe support plate. A circular groove is formed in an outer wall of the syringe barrel close to the syringe support plate. A partition plate is fixedly assembled on an outer wall of the syringe support plate away from the syringe barrel. An anti-slip pattern is formed in an outer wall of the syringe support plate close to the syringe barrel. An insertion pipe is fixedly assembled on an outer wall of the syringe barrel away from the syringe support plate. An annular groove is formed in an outer edge of the insertion pipe.

[0004] The existing syringe structure mainly includes a barrel for containing liquid medicine, a piston, a piston rod for driving the piston to move, and a needle tube installed at one end of the barrel. This type of syringe has a simple structure, stable and reliable quality, and low manufacturing cost, and belongs to the most widely used type of syringe in the medical field.

[0005] Based on the above retrieval and combined with practical problems, it is found that although the existing syringe types have a simple structure and stable and reliable quality, there are still certain operation difficulties in actual applications. For example, when medical staff prepare liquid medicine, they need to frequently use a syringe to draw and inject and mix different liquid medicines. During this process, medical staff need to frequently push and pull the piston rod of the syringe. For medical staff with low operation proficiency, they need to operate with both hands and apply a lot of force, thus increasing the operation difficulty of liquid medicine preparation and reducing the liquid medicine preparation efficiency. Even for medical staff with proficient operation who can operate with one hand, frequent pushing and pulling of the piston rod will still cause fatigue and reduce the liquid medicine configuration efficiency. Summary of the Invention

[0006] The purpose of the present invention is to provide an integrated push-pull intravenous syringe assembly to solve the problems raised in the above background art.

[0007] The technical solution of the present invention is: an integrated drawing and pushing intravenous syringe assembly, including a syringe, and further including a drawing and pushing device; the drawing and pushing device includes a semi-cylindrical barrel and a housing, a guide groove is opened on the lower side of the semi-cylindrical barrel, a sliding plate is slidably connected inside the guide groove, a first slide bar and a second slide bar are symmetrically and slidably connected inside the housing, a reversing rack is fixed on the side surfaces of the first slide bar and the second slide bar, and a reversing gear meshing with the two reversing racks is rotatably connected to the housing. A driving mechanism is arranged between the first slide bar, the second slide bar and the housing, and the upper side of the first slide bar is fixed to the lower side of the sliding plate; the driving mechanism includes two driving racks fixed on the lower sides of the first slide bar and the second slide bar and a driven shaft rotatably connected to one side inside the housing, a first driving gear and a second driving gear respectively meshing with the two driving racks are rotatably connected to the outer side of the driven shaft, and a speed reduction driving mechanism for driving the driven shaft to rotate is arranged on the other side of the housing.

[0008] Preferably, the driving mechanism further includes two spline sleeve shafts fixed at one ends of the first driving gear and the second driving gear and movably sleeved on the outer side of the driven shaft, a switching cylinder slidably arranged on the outer side of the driven shaft, two spline sleeves are fixed at both ends inside the switching cylinder, and the two spline sleeves are respectively adapted to the outer sides of the two spline sleeve shafts. A switching mechanism for switching the position of the switching cylinder is arranged between the switching cylinder and the housing.

[0009] Preferably, the switching mechanism includes an annular groove opened at the middle position on the outer side of the switching cylinder and a lever strut fixed at the bottom end inside the housing, a lever is rotatably connected to the outer side of the lever strut, one end of the lever extends to the outside of the housing, and a fork is fixed at the other end of the lever. Two push shafts movably adapted to the inside of the annular groove are movably arranged at both ends of the fork.

[0010] Preferably, a plurality of guide bars are fixed at the position of the driven shaft corresponding to the switching cylinder, and a plurality of chutes slidably matched with each guide bar are opened inside the switching cylinder.

[0011] Preferably, the speed reduction transmission mechanism includes a driving shaft rotatably connected through one side of the housing and an internal gear ring fixed inside the housing. A central gear is fixed on the outer side of the driving shaft and located inside the housing. A plurality of planet gears arranged in a circle are meshed and driven by teeth on the outer side of the central gear. One side of the plurality of planet gears is rotatably connected to a gear rack. The center position of one side of the gear rack is fixedly connected to one end of the driven shaft. The other end of the driving shaft is provided with a second rotating rod, and the driving shaft and the second rotating rod are unidirectionally rotatably connected through a one-way bearing. One side of the outside of the housing is fixedly connected to a fixed shaft. One end of the outer side of the fixed shaft is rotatably connected to a first rotating rod. A cross shaft is fixed between the first rotating rod and the second rotating rod. A grip rod is rotatably connected to the outer side of the cross shaft. A force limiting mechanism is arranged between the grip rod and the first rotating rod and the second rotating rod.

[0012] Preferably, one end of the outer side of the fixed shaft is fixedly connected to an end plate, and a torsion spring is sleeved on the outer side of the fixed shaft. The two ends of the torsion spring are respectively fixedly connected to the end plate and one side of the first rotating rod.

[0013] Preferably, the force limiting mechanism includes a pressing rod fixed to one end of the grip rod and a cross plate fixed between the second rotating rod and the first rotating rod. A screw rod is threadedly connected through the middle position of the cross plate. One end of the screw rod is rotatably connected to an adapter plate. One side of the adapter plate is elastically connected to one side of the pressing rod through a limiting spring.

[0014] Preferably, a grip is fixed to the lower side of the housing.

[0015] Preferably, a plurality of magnets are fixed to both ends of the transposition cylinder. Both the driving gear one and the driving gear two are made of stainless steel.

[0016] Preferably, a pushing plate and a pulling plate for pushing and pulling the piston rod of the syringe are fixed to one end of the upper side of the sliding plate.

[0017] The present invention provides a push-pull integrated intravenous syringe assembly through improvement. Compared with the prior art, it has the following improvements and advantages:

[0018] First: Through the mutual cooperation of the transposition mechanism and the push-pull device of the present invention, when medical staff frequently aspirate and inject liquid medicine during the medicine preparation process, only one hand needs to repeat the same action to complete two opposite actions of pulling and pushing, without directly using the hand to push and pull the piston rod of the syringe, greatly reducing the operation difficulty of the syringe. Medical staff can operate the syringe more conveniently with one hand, improving the medicine preparation efficiency.

[0019] Second: Through the speed reduction drive mechanism, the present invention drives the rotation of the driven shaft in the pushing device, thereby realizing the function of pushing and pulling the piston rod of the syringe, increasing the pushing and pulling force on the piston rod of the syringe. Therefore, during the process of frequent aspiration and injection of liquid medicine during medicine preparation, the force that medical staff need to apply can be greatly reduced, reducing the fatigue of the medical staff's hands, helping to improve the efficiency of medicine preparation. Especially when injecting liquid medicine into the human body, the liquid medicine can be injected into the human body without applying a large thrust, avoiding the shaking of the syringe caused by the soreness and shaking of the medical staff's hands due to long-term application of a large force, improving the stability of liquid medicine injection, and thus enhancing the safety during injection.

[0020] Third: Through the force limiting mechanism, the present invention helps medical staff to judge the pressing force. When the medical staff applies too large a pressing force to the grip rod during operation, the angles between the grip rod, the first rotating rod, and the second rotating rod will change, playing a role in reminding the medical staff. The medical staff can appropriately reduce the pressing force to ensure the injection stability, thereby further enhancing the safety during the injection process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 is the schematic structural diagram of the first perspective of the present invention;

[0023] Figure 2 is the schematic structural diagram of the second perspective of the present invention;

[0024] Figure 3 is the schematic structural diagram of the third perspective of the present invention;

[0025] Figure 4 is the schematic sectional view structure diagram of the first of the present invention;

[0026] Figure 5 is of the present invention Figure 3 is the enlarged structural diagram of part A;

[0027] Figure 6 is of the present invention Figure 4 is the enlarged structural diagram of part B;

[0028] Figure 7 is the schematic sectional view structure diagram of the second of the present invention;

[0029] Figure 8 is of the present invention Figure 7Schematic diagram of the enlarged structure at position C in

[0030] Figure 9 Schematic diagram of the disassembled structure of driving gear one and driving gear two in the present invention;

[0031] Figure 10 of the present invention Figure 9 Schematic diagram of the enlarged structure at position D in

[0032] Reference numerals:

[0033] 1. Syringe; 2. Semi-cylindrical tube; 3. Outer shell; 4. Guide groove; 5. Slide plate; 6. Slide bar one; 7. Slide bar two; 8. Reversing gear; 9. Reversing rack; 10. Pushing plate; 11. Drawing plate; 12. Handle; 101. Driving rack; 102. Driven shaft; 103. Driving gear one; 104. Driving gear two; 105. Spline sleeve shaft; 106. Transposition cylinder; 107. Spline sleeve; 108. Guide bar; 109. Chute; 201. Internal gear ring; 202. Driving shaft; 203. Central gear; 204. Planetary gear; 205. Gear rack; 301. First rotating rod; 302. Cross shaft; 303. Holding rod; 304. Pressing rod; 305. Limiting spring; 306. Cross plate; 307. Connecting plate; 308. Screw; 309. Fixed shaft; 310. End plate; 311. Torsion spring; 312. One-way bearing; 313. Second rotating rod; 401. Poking rod; 402. Poking rod support rod; 403. Fork; 404. Pushing shaft; 405. Annular groove; 406. Magnet. Detailed implementation manners

[0034] The present invention will be described in detail below. The technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0035] The present invention provides an integrated drawing and pushing intravenous syringe assembly through improvement. The technical solution of the present invention is:

[0036] As Figures 1 to 10As shown in the figure, an embodiment of the present invention provides a push-pull integrated intravenous syringe assembly, which includes a syringe 1 and also includes a push-pull device; the push-pull device includes a semi-cylindrical tube 2 and a housing 3. A grip 12 is fixed to the lower side of the housing 3. A guide groove 4 is formed on the lower side of the semi-cylindrical tube 2. A slide plate 5 is slidably connected to the inner side of the guide groove 4. A first slide bar 6 and a second slide bar 7 are symmetrically and slidably connected to the inner side of the housing 3. A reversing rack 9 is fixed to the side surfaces of both the first slide bar 6 and the second slide bar 7. A reversing gear 8 meshing with the two reversing racks 9 is rotatably connected to the housing 3. A driving mechanism is provided between the first slide bar 6, the second slide bar 7, and the housing 3. The upper side of the first slide bar 6 is fixed to the lower side of the slide plate 5; the driving mechanism includes two driving racks 101 fixed to the lower sides of the first slide bar 6 and the second slide bar 7 and a driven shaft 102 rotatably connected to one side inside the housing 3. A first driving gear 103 and a second driving gear 104 meshing with the two driving racks 101 respectively are rotatably connected to the outer side of the driven shaft 102. The driving mechanism (as Figure 10 shown) further includes two spline sleeve shafts 105 fixed to one ends of the first driving gear 103 and the second driving gear 104 and movably sleeved on the outer side of the driven shaft 102, and a position-changing cylinder 106 slidably disposed on the outer side of the driven shaft 102. Two spline sleeves 107 are fixed to both ends inside the position-changing cylinder 106. The two spline sleeves 107 are respectively adapted to the outer sides of the two spline sleeve shafts 105. A position-changing mechanism for switching the position of the position-changing cylinder 106 is provided between the position-changing cylinder 106 and the housing 3. A speed reduction driving mechanism for driving the rotation of the driven shaft 102 is provided on the other side of the housing 3.

[0037] Further, the position-changing mechanism (in combination with Figure 4 and Figure 10 ) includes an annular groove 405 formed in the middle position on the outer side of the position-changing cylinder 106 and a lever support 402 fixed to the inner bottom end of the housing 3. A lever 401 is rotatably connected to the outer side of the lever support 402. One end of the lever 401 extends to the outer side of the housing 3, and a fork 403 is fixed to the other end of the lever 401. Two push shafts 404 movably adapted to the inner side of the annular groove 405 are movably provided at both ends of the fork 403 (as Figure 8 shown);

[0038] Through the position-changing mechanism, the position-changing cylinder 106 is switched to engage and cooperate with the first driving gear 103 and the second driving gear 104 separately, so as to drive the first driving gear 103 or the second driving gear 104 separately. Only by repeating the same action with one hand can the two opposite actions of pulling and pushing be completed. There is no need to directly pull and push the piston rod of the syringe 1 by hand, which greatly reduces the operation difficulty of the syringe 1 and can reduce the operation steps of the syringe 1 during the drug preparation process, improving the drug preparation efficiency.

[0039] Further, a plurality of guide bars 108 are fixed at the position of the commutation cylinder 106 on the outer side of the driven shaft 102, and a plurality of chutes 109 that are slidably engaged with each guide bar 108 are provided on the inner side of the commutation cylinder 106;

[0040] The commutation cylinder 106 is limited by the sliding fit between the guide bar 108 and the chute 109, so that it can only slide linearly along the outer side of the driven shaft 102 without rotation, thereby ensuring that the rotational torque of the driven shaft 102 is transmitted to the first driving gear 103 or the second driving gear 104 through the commutation cylinder 106.

[0041] Further, the reduction drive mechanism includes a drive shaft 202 rotatably connected through the side of the housing 3 and an internal gear ring 201 fixed inside the housing 3. A central gear 203 located inside the housing 3 is fixed on the outer side of the drive shaft 202. A plurality of planet gears 204 arranged in a circle are driven by tooth engagement on the outer side of the central gear 203. A gear frame 205 is rotatably connected to one side of the plurality of planet gears 204. The center position of one side of the gear frame 205 is fixedly connected to one end of the driven shaft 102. A second rotating rod 313 is provided at the other end of the drive shaft 202, and the drive shaft 202 and the second rotating rod 313 are rotatably connected unidirectionally through a one-way bearing 312 (as Figure 1 shown). A fixed shaft 309 is fixed on the outer side of one side of the housing 3. One end of the outer side of the fixed shaft 309 is rotatably connected to a first rotating rod 301. A cross shaft 302 is fixed between the first rotating rod 301 and the second rotating rod 313. A grip rod 303 is rotatably connected to the outer side of the cross shaft 302. A force limiting mechanism is provided between the grip rod 303 and the first rotating rod 301 and the second rotating rod 313;

[0042] Through the reduction drive mechanism, the driven shaft 102 in the push-pull device is driven to rotate, thereby realizing the function of pushing and pulling the piston rod of the syringe 1, increasing the pushing and pulling force on the piston rod of the syringe 1, so that when frequently sucking and injecting the liquid medicine during the medicine preparation process, the force required by the medical staff can be greatly reduced, reducing the fatigue of the medical staff's hands, helping to improve the medicine preparation efficiency. Especially when injecting the liquid medicine into the human body, the liquid medicine can be injected into the human body without applying a large thrust, avoiding the syringe 1 from shaking due to the medical staff's hands generating soreness and shaking after a long time of applying a large force, improving the stability of the liquid medicine injection, and thus improving the safety during injection.

[0043] Further, one end of the outer side of the fixed shaft 309 is fixed with an end plate 310, and a torsion spring 311 is sleeved on the outer side of the fixed shaft 309. The two ends of the torsion spring 311 are respectively fixedly connected to the end plate 310 and one side of the first rotating rod 301;

[0044] When the grip rod 303 is pressed to drive the first rotating rod 301 to rotate, the first rotating rod 301 rotates to drive one end of the torsion spring 311 to twist, thereby storing energy in the torsion spring 311. When the grip rod 303 is released, under the action of the torsion spring 311, a reverse torsion force is applied to the first rotating rod 301, facilitating the reverse rotation and reset of the first rotating rod 301 and the second rotating rod 313, which is convenient for medical staff to operate. When the medical staff operates, they only need to continuously press the grip rod 303, greatly reducing the difficulty of frequently pushing and pulling the piston rod of the syringe 1.

[0045] Further, the force limiting mechanism includes a pressure rod 304 fixed to one end of the grip rod 303 (as Figure 6 shown) and a cross plate 306 fixed between the second rotating rod 313 and the first rotating rod 301. A screw rod 308 is threadedly connected through the middle position of the cross plate 306. One end of the screw rod 308 is rotatably connected to an adapter plate 307. One side of the adapter plate 307 is elastically connected to one side of the pressure rod 304 through a limiting spring 305.

[0046] Through the force limiting mechanism, it helps medical staff to judge the pressing force. When the medical staff applies too much pressing force to the grip rod 303 during operation, the angles between the grip rod 303, the first rotating rod 301, and the second rotating rod 313 will change, which plays a role in reminding the medical staff. The medical staff can appropriately reduce the pressing force to ensure the injection stability, thereby further improving the safety of the injection process.

[0047] Further, a plurality of magnets 406 are fixed to both ends of the transposition cylinder 106 (as Figure 10 shown), and both the first driving gear 103 and the second driving gear 104 are made of stainless steel;

[0048] Under the magnetic suction force of the magnets 406 on the first driving gear 103 and the second driving gear 104, when any one of the spline sleeves 107 in the transposition cylinder 106 is sleeved outside the corresponding spline shaft 105, the transposition cylinder 106 can be attracted to the side of the corresponding first driving gear 103 or the second driving gear 104, preventing the spline sleeve 107 from falling off the spline shaft 105 and ensuring the stability during operation.

[0049] Further, a push plate 10 and a pull plate 11 for pushing and pulling the piston rod of the syringe 1 are fixed to one end of the upper side of the slide plate 5;

[0050] The slide plate 5 applies a thrust to the piston rod of the syringe 1 through the push plate 10 to make the syringe 1 inject, and the slide plate 5 applies a pulling force to the piston rod of the syringe 1 through the pull plate 11 to make the syringe 1 draw liquid.

[0051] Working principle: When in use, the syringe 1 is placed inside the semi-cylinder 2 of the pumping device, and the pressure plate at the end of the piston rod of the syringe 1 is located between the push plate 10 and the pumping plate 11. When the piston of the syringe 1 needs to be pulled outward to absorb liquid, the lever 401 of the shifting mechanism is toggled. Under the action of the lever support rod 402, the other end of the lever 401 drives the shift fork 403 to rotate in the opposite direction, and the shift fork 403 drives the two driving shafts 404 to move synchronously in one direction. Due to the contact between the driving shaft 404 and the annular groove 405, the piston of the syringe 1 is pulled outward to absorb liquid. When the shift fork 403 drives the two driving shafts 404 to move, the two driving shafts 404 can apply thrust to the side wall of the annular groove 405, thereby driving the transposition cylinder 106 of the driving mechanism to move to the side where the slide bar 2 7 is located, so that the spline sleeve 107 at one end of the inner side of the transposition cylinder 106 is sleeved on the outer side of a spline sleeve shaft 105 at one end of the driving gear 2 104, so that the transposition cylinder 106 and the driving gear 2 104 form a whole, and the transposition cylinder 106 can The rotational torque of the driven shaft 102 is transmitted to the driving gear 2 104. At this time, the driving gear 1 103 is still connected to the outer side of the driven shaft 102, and the rotational torque will not be transmitted to the driving gear 1 103. At this time, when the driven shaft 102 rotates, the driving gear 2 104 is driven to rotate through the transposition cylinder 106. The driving gear 2 104 is meshed with the driving rack 101 located on the lower side of the slide bar 2 7 to drive the slide bar 2 7 to move toward one end of the needle tube of the syringe 1. The slide bar 2 7 drives a reversing rack 9 on its side. The reversing gear 8 rotates through the meshing between the reversing rack 9 and the reversing gear 8, and the reversing gear 8 drives the reversing rack 9 located on the side of the slide bar 6 to move in the opposite direction, thereby driving the slide bar 6 to move in the opposite direction. Since the upper side of the slide bar 6 is fixed to the lower side of the slide plate 5, the slide bar 6 can drive the slide plate 5 to move away from the end of the needle tube of the syringe 1, and the slide plate 5 then draws out the piston rod of the syringe 1 through the pumping plate 11, thereby realizing the effect of sucking the syringe 1.

[0052] When it is necessary to inject the liquid medicine, the lever 401 of the transposition mechanism is reversely shifted. The same principle is used to drive the transposition cylinder 106 of the pumping device to move in the opposite direction, so that the spline sleeve 107 at the other end thereof is sleeved on the outer side of the spline sleeve shaft 105 at one end of the driving gear 103, so that the transposition cylinder 106 and the driving gear 103 form a whole, and the transposition cylinder 106 and the driving gear 2 104 are separated. At this time, the rotational torque of the driven shaft 102 is only transmitted to the driving gear 103, and the driving gear 103 rotates to drive the slide bar 16 to move toward one end of the needle tube of the syringe 1. At this time, the slide bar 27 is reversely moved by the action of the reversing gear 8. The slide bar 16 drives the slide plate 5 to move toward one end of the needle tube of the syringe 1, and the slide plate 5 pushes the piston rod of the syringe 1 through the push plate 10 to realize the injection effect of the syringe 1. The transposition cylinder 106 in the pull-pushing device is adjusted by the transposition mechanism to be separately combined with the driving gear 103 or the driving gear 2 104. When the driven shaft 102 rotates in only one direction, the slide bar 16 and the slide bar 2 7 can be driven to move back and forth in the opposite direction, that is, each time the slide bar 16 moves, the slide bar 2 7 moves in the opposite direction, and the piston rod of the syringe 1 can be driven to move back and forth without reciprocatingly pushing and pulling the piston rod of the syringe 1, so as to realize the action of extracting liquid and injecting, thereby improving the operation convenience of the syringe 1;

[0053] Therefore, with the cooperation between the transposition mechanism and the pumping and pushing device, when medical staff frequently draw and inject the drug solution during the medication dispensing process, they do not need to directly pull and push the piston rod of the syringe 1 by hand, which greatly reduces the difficulty of operating the syringe 1. Medical staff can more conveniently operate the syringe 1 with one hand, thereby improving the medication dispensing efficiency.

[0054] When medical staff are actually operating, they hold the grip 12 with their hands and continuously press the grip rod 303 of the deceleration drive mechanism. When the pressing force on the grip rod 303 is relatively small, one end of the grip rod 303 is elastically connected to the cross plate 306 through the limiting spring 305 of the force limiting mechanism. Through the limiting spring 305 and the cross plate 306, thrust can be transmitted to the second rotating rod 313 and the first rotating rod 301, so that the grip rod 303 drives the second rotating rod 313 and the first rotating rod 301 to rotate around the axis lines of the fixed shaft 309 and the driving shaft 202. When the second rotating rod 313 rotates, it drives the driving shaft 202 to rotate synchronously through the one-way bearing 312 with one-way locking. The driving shaft 202 drives the central gear 203 to rotate. The central gear 203 drives multiple planetary gears 204 to rotate synchronously by tooth engagement. When the multiple planetary gears 204 rotate, they will engage with the inner teeth on the inner side of the inner gear ring 201, so that the multiple planetary gears 204 can not only rotate around their own axes but also revolve around the central gear 203 while rotating. The multiple planetary gears 204 drive the gear frame 205 to rotate. Under the transmission action among the central gear 203, the planetary gears 204, and the inner gear ring 201, the rotational angular velocity of the gear frame 205 is less than that of the driving shaft 202, so it plays a decelerating role, and at the same time, the rotational torque of the gear frame 205 is increased. The gear frame 205 transmits a greater decelerating torque to the driven shaft 102 of the pumping and pushing device, so as to drive the first driving gear 103 or the second driving gear 104 to rotate respectively, thereby increasing the pumping and pushing force on the slide plate 5, and further increasing the pumping and pushing force on the piston rod of the syringe 1. Thus, when frequently sucking and injecting the liquid medicine during the medicine preparation process, the force that the medical staff needs to apply can be greatly reduced, the fatigue of the medical staff's hands can be reduced, which helps to improve the medicine preparation efficiency. Especially when injecting the liquid medicine into the human body, the liquid medicine can be injected into the human body without applying a large thrust, avoiding the syringe 1 from shaking due to the long-term large force applied by the medical staff's hands resulting in soreness and shaking, improving the stability of the liquid medicine injection, and thus improving the safety during injection;

[0055] When the grip rod 303 is pressed to drive the first rotating rod 301 to rotate, one end of the first rotating rod 301 drives the torsion spring 311 to twist, so that the torsion spring 311 stores energy. When the grip rod 303 is released, under the action of the torsion spring 311, a reverse torsion force is applied to the first rotating rod 301, which is convenient for the first rotating rod 301 and the second rotating rod 313 to rotate in the reverse direction and reset, facilitating the operation of the medical staff. When the medical staff operates, they only need to continuously press the grip rod 303, greatly reducing the difficulty of frequently pumping and pushing the piston rod of the syringe 1;

[0056] To prevent the injection liquid from flowing too fast due to excessive force, causing discomfort to the patient, when medical staff operate and press the grip lever 303, if the pressing force is too large, the force will be transmitted to the pressure lever 304 after the grip lever 303 is stressed, and the pressure lever 304 will transmit the force to the limiting spring 305. When the force reaches a certain value, the limiting spring 305 will be compressed. At this time, medical staff can feel the change in the angle between the grip lever 303, the first rotating lever 301, and the second rotating lever 313. Therefore, it helps medical staff judge the pressing force. When the angle between the grip lever 303, the first rotating lever 301, and the second rotating lever 313 changes, medical staff can appropriately reduce the pressing force to ensure the injection stability;

[0057] The screw rod 308 of the rotational force limiting mechanism drives the connecting plate 307 to move, so that the connecting plate 307 compresses the limiting spring 305 to different degrees. The greater the limiting spring 305 is compressed, the greater the pressing force required for the grip lever 303 to rotate. Therefore, the upper limit of the force limit can be flexibly adjusted according to the requirements of the actual injection force.

[0058] The above description enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can 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 these embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An integrated intravenous syringe assembly, comprising a syringe (1), characterized in that: Also includes a pull-and-push device; The pushing and pulling device comprises a semi-cylinder (2) and a shell (3), a guide groove (4) is provided on the lower side of the semi-cylinder (2), a slide plate (5) is slidably connected to the inner side of the guide groove (4), a slide bar 1 (6) and a slide bar 2 (7) are symmetrically slidably connected to the inner side of the shell (3), a reversing rack (9) is fixed to the side surfaces of the slide bar 1 (6) and the slide bar 2 (7), and a reversing gear (8) meshing with the two reversing racks (9) is rotatably connected to the shell (3), a driving mechanism is provided between the slide bar 1 (6), the slide bar 2 (7) and the shell (3), and the upper side of the slide bar 1 (6) is fixed to the lower side of the slide plate (5); The driving mechanism comprises two driving racks (101) fixed to the lower sides of the first slide bar (6) and the second slide bar (7) and a driven shaft (102) rotatably connected to one side of the interior of the housing (3); the outer side of the driven shaft (102) is rotatably connected to a driving gear 1 (103) and a driving gear 2 (104) respectively meshing with the two driving racks (101); and the other side of the housing (3) is provided with a speed reduction driving mechanism for pulling the driven shaft (102) to rotate; The driving mechanism further comprises two spline sleeves (105) fixed to one end of the driving gear 1 (103) and the driving gear 2 (104) and movably sleeved on the outside of the driven shaft (102), and a transposition cylinder (106) slidably arranged on the outside of the driven shaft (102); two spline sleeves (107) are fixed to the two ends of the inner side of the transposition cylinder (106); the two spline sleeves (107) are respectively matched with the outer sides of the two spline sleeves (105); and a transposition mechanism for switching the position of the transposition cylinder (106) is arranged between the transposition cylinder (106) and the housing (3).

2. The integrated intravenous syringe assembly according to claim 1, characterized in that: The shifting mechanism comprises an annular groove (405) formed on the outer side of the shifting cylinder (106) at a middle position and a shifting rod support rod (402) fixed to the inner bottom end of the outer shell (3); the outer side of the shifting rod support rod (402) is rotatably connected to a shifting rod (401); one end of the shifting rod (401) extends to the outer side of the outer shell (3); and a shifting fork (403) is fixed to the other end of the shifting rod (401); and two driving shafts (404) movably adapted to the inner side of the annular groove (405) are movably provided at both ends of the shifting fork (403).

3. The integrated intravenous syringe assembly according to claim 1, characterized in that: A plurality of guide bars (108) are fixed on the outside of the driven shaft (102) at the position of the transposition cylinder (106), and a plurality of slide grooves (109) slidably matched with each guide bar (108) are provided on the inside of the transposition cylinder (106).

4. The integrated intravenous syringe assembly according to claim 1, characterized in that: The reduction drive mechanism comprises a driving shaft (202) rotatably connected to one side of the housing (3) and an inner gear ring (201) fixed to the inner side of the housing (3); a central gear (203) located on the inner side of the housing (3) is fixed to the outer side of the driving shaft (202); a plurality of planetary gears (204) arranged in a circle are driven by tooth meshing on the outer side of the central gear (203); a gear rack (205) is rotatably connected to one side of the plurality of planetary gears (204); a central position of one side of the gear rack (205) is fixedly connected to one end of the driven shaft (102); and the other end of the driving shaft (202) is connected to the gear rack (205). A second rotating rod (313) is provided, and the driving shaft (202) and the second rotating rod (313) are unidirectionally rotatably connected via a one-way bearing (312); a fixed shaft (309) is fixed to one side of the outer portion of the housing (3); an outer end of the fixed shaft (309) is rotatably connected to the first rotating rod (301); a transverse axis (302) is fixed between the first rotating rod (301) and the second rotating rod (313); a gripping rod (303) is rotatably connected to the outer side of the transverse axis (302); and a force limiting mechanism is provided between the gripping rod (303) and the first rotating rod (301) and the second rotating rod (313).

5. The integrated intravenous syringe assembly according to claim 4, characterized in that: An end plate (310) is fixed to one end of the outer side of the fixed shaft (309), and a torsion spring (311) is sleeved on the outer side of the fixed shaft (309), with two ends of the torsion spring (311) respectively fixedly connected to the end plate (310) and one side of the first rotating rod (301).

6. The integrated intravenous syringe assembly according to claim 4, characterized in that: The force limiting mechanism comprises a pressure rod (304) fixed at one end of the grip rod (303) and a transverse plate (306) fixed between the second rotating rod (313) and the first rotating rod (301); a screw rod (308) is threadedly connected through the middle section of the transverse plate (306); one end of the screw rod (308) is rotatably connected to a connecting plate (307); one side of the connecting plate (307) is elastically connected to one side of the pressure rod (304) via a limiting spring (305).

7. The integrated intravenous syringe assembly according to claim 1, characterized in that: A handle (12) is fixed to the lower side of the housing (3).

8. The integrated intravenous syringe assembly according to claim 1, characterized in that: A plurality of magnets (406) are fixed to both ends of the transposition cylinder (106), and the driving gear 1 (103) and the driving gear 2 (104) are both components made of stainless steel.

9. The integrated intravenous syringe assembly according to claim 1, characterized in that: A push plate (10) and a pull plate (11) for pulling and pushing the piston rod of the syringe (1) are fixed to one end of the upper side of the slide plate (5).

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