Drawing and pushing integrated intravenous injector assembly

Abstract

The invention relates to the technical field of medical instruments, in particular to a drawing and pushing integrated intravenous injector assembly which comprises an injector and further comprises a drawing and pushing device. The drawing and pushing device comprises a semicircular cylinder and a shell, a guide groove is formed in the lower side of the semicircular cylinder, a sliding plate is slidably connected to the inner side of the guide groove, a first sliding strip and a second sliding strip are symmetrically slidably connected to the inner side of the shell, and reversing racks are fixed to the side faces of the first sliding strip and the second sliding strip; and the shell is rotationally connected with a reversing gear meshed with the two reversing racks. Under the mutual cooperation of the transposition mechanism and the drawing and pushing device, when medical staff frequently suck and inject liquid medicine in the dispensing process, the two opposite actions of drawing and pushing can be completed only by repeating the same action with one hand, a piston rod of an injector does not need to be directly drawn and pushed with the hand, the operation difficulty of the injector is greatly reduced, and the working efficiency of the injector is improved. Medical staff can operate the injector with one hand more conveniently, and medicine dispensing efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, and in particular to a pumping and pushing integrated intravenous syringe assembly. Background Art

[0002] Medical syringes are a commonly used medical device in the medical and health system, mainly used to inject liquid medicines into patients. At the same time, when medical staff dispense medicines, they also need to use syringes to mix different types of medicines in different proportions to form the required liquid medicine.

[0003] After searching, a Chinese patent with publication number: CN117982754A discloses a medical syringe, including a syringe body, an outer wall of the syringe body is fixedly equipped with a syringe support plate, an outer wall of the syringe body on the side close to the syringe support plate is provided with a circular groove, an outer wall of the syringe support plate on the side away from the syringe body is fixedly equipped with a blocking plate, an outer wall of the syringe support plate on the side close to the syringe body is provided with anti-slip grooves, and an outer wall of the end of the syringe body away from the syringe support plate is fixedly equipped with a plug tube, and an outer edge of the plug tube is provided with an annular groove.

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

[0005] Based on the above search and combined with actual problems, it is found that although the existing syringe types are simple in structure and have stable and reliable quality, they still have certain operating difficulties in actual applications. For example, when medical staff prepare liquid medicine, they need to frequently use syringes to extract and inject mixed different liquid medicines. In this process, medical staff need to frequently pull and push the piston rod of the syringe. Medical staff with low operating proficiency need to operate with both hands and need to exert great force, which increases the difficulty of liquid medicine preparation and reduces the efficiency of liquid medicine preparation. Even for skilled medical staff who can operate with one hand, frequent pulling and pushing of the piston rod will still cause fatigue, reducing the efficiency of liquid medicine preparation. Summary of the invention

[0006] The object of the present invention is to provide an integrated intravenous syringe assembly for withdrawing and pushing, so as to solve the problems raised in the above-mentioned background technology.

[0007] The technical solution of the present invention is: an integrated pull-and-push intravenous syringe assembly, including a syringe and a pull-and-push device; the pull-and-push device includes a semi-cylinder and a shell, a guide groove is opened on the lower side of the semi-cylinder, a slide plate is slidably connected to the inner side of the guide groove, a slide bar 1 and a slide bar 2 are symmetrically slidably connected to the inner side of the shell, a reversing rack is fixed on the side surfaces of the slide bar 1 and the slide bar 2, and a reversing gear meshing with the two reversing racks is rotatably connected on the shell, a driving mechanism is arranged between the slide bar 1, the slide bar 2 and the shell, and the upper side of the slide bar 1 is fixed to the lower side of the slide plate; the driving mechanism includes two driving racks fixed to the lower sides of the slide bar 1 and the slide bar 2 and a driven shaft rotatably connected to one side of the inner side of the shell, the outer side of the driven shaft is rotatably connected to a driving gear 1 and a driving gear 2 respectively meshing with the two driving racks, and a reduction driving mechanism for pulling the driven shaft to rotate is arranged on the other side of the shell.

[0008] Preferably, the driving mechanism also includes two spline sleeves fixed at one end of driving gear one and driving gear two and movably sleeved on the outside of the driven shaft, and a transposition cylinder slidably arranged on the outside of the driven shaft, two spline sleeves are fixed at both ends of the inner side of the transposition cylinder, and the two spline sleeves are respectively adapted to the outer sides of the two spline sleeves, and a transposition mechanism for switching the position of the transposition cylinder is arranged between the transposition cylinder and the outer shell.

[0009] Preferably, the shifting mechanism includes an annular groove opened on the outer side of the shifting cylinder at the middle position and a shift rod support rod fixed to the bottom end of the inner side of the shell, the outer side of the shift rod support rod is rotatably connected to a shift rod, one end of the shift rod extends to the outside of the shell, and a shift fork is fixed to the other end of the shift rod, and two driving shafts movably adapted to the inner side of the annular groove are movably provided at both ends of the shift fork.

[0010] Preferably, a plurality of guide bars are fixed on the outer side of the driven shaft at the position of the transposition cylinder, and a plurality of sliding grooves slidably matched with each guide bar are provided on the inner side of the transposition cylinder.

[0011] Preferably, the reduction transmission mechanism includes a driving shaft that is rotatably connected to one side of the outer shell and an inner gear ring fixed to the inner side of the outer shell, a central gear located on the inner side of the outer shell is fixed to the outer side of the driving shaft, and a plurality of planetary gears arranged in a circle are transmitted by tooth meshing on the outer side of the central gear, one side of the plurality of planetary gears is rotatably connected to a gear rack, and the center position of one side of the gear rack is fixedly connected to one end of the driven shaft, a second rotating rod is provided at the other end of the driving shaft, and the driving shaft and the second rotating rod are unidirectionally connected via a one-way bearing, a fixed shaft is fixed to one side of the outer shell, and one end of the outer side of the fixed shaft is rotatably connected to the first rotating rod, a transverse shaft is fixed between the first rotating rod and the second rotating rod, and a grip rod is rotatably connected to the outer side of the transverse shaft, and a force limiting mechanism is provided between the grip rod and the first rotating rod and the second rotating rod.

[0012] Preferably, an end plate is fixed to one end of the outer side of the fixed shaft, and a torsion spring is sleeved on the outer side of the fixed shaft, and 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 pressure rod fixed at one end of the grip rod and a horizontal plate fixed between the second rotating rod and the first rotating rod, a screw rod is threadedly connected through the middle section of the horizontal plate, one end of the screw rod is rotatably connected to a connecting plate, and one side of the connecting plate is elastically connected to one side of the pressure rod through a limiting spring.

[0014] Preferably, a handle is fixed to the lower side of the shell.

[0015] Preferably, a plurality of magnets are fixed to both ends of the transposition cylinder, and the driving gear 1 and the driving gear 2 are both made of stainless steel.

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

[0017] The present invention provides an integrated intravenous syringe assembly through improvement, which has the following improvements and advantages compared with the prior art: First, through the cooperation between the transposition mechanism and the extraction and pushing device, when medical staff frequently draw and inject medicine during the medication dispensing process, they only need to repeat the same action with one hand to complete the two opposite actions of extraction and pushing, without the need to directly draw and push the piston rod of the syringe with hands, which greatly reduces the difficulty of operating the syringe. Medical staff can operate the syringe with one hand more conveniently, thereby improving the medication dispensing efficiency.

[0018] Secondly, the present invention drives the driven shaft in the pulling and pushing device to rotate through the deceleration drive mechanism, thereby achieving the function of pulling and pushing the syringe piston rod, increasing the pulling and pushing force of the syringe piston rod, and thus greatly reducing the force required to be applied by medical staff when frequently sucking and injecting medicine during the medication process, reducing the fatigue of the medical staff's hands, and helping to improve the medication efficiency. Especially when injecting medicine into the human body, the medicine can be injected into the human body without applying a large thrust, avoiding the soreness and shaking of the medical staff's hands due to long-term use of large force, resulting in shaking of the syringe, thereby improving the stability of the medicine injection, thereby improving the safety during injection.

[0019] Thirdly, the present invention helps medical staff to judge the pressing force through the force limiting mechanism. When the medical staff applies too much pressing force on the grip, the angle between the grip and the first rotating rod and the second rotating rod will change, which serves to remind 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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.

[0021] Figure 1 It is a schematic diagram of the structure of the present invention from a first viewing angle; Figure 2 It is a schematic diagram of the structure of the second viewing angle of the present invention; Figure 3 It is a schematic diagram of the structure from a third viewing angle of the present invention; Figure 4 It is a first cross-sectional structural schematic diagram of the present invention; Figure 5 For the present invention Figure 3 A schematic diagram of the enlarged structure at A in the middle; Figure 6 For the present invention Figure 4 A schematic diagram of the enlarged structure at B in the middle; Figure 7 It is a second cross-sectional structural schematic diagram of the present invention; Figure 8 For the present invention Figure 7 Schematic diagram of the enlarged structure at C in the middle; Fig. 9 It is a schematic diagram of the disassembled structure of the driving gear 1 and the driving gear 2 in the present invention; Fig.10For the present invention Fig. 9 Schematic diagram of the enlarged structure at D in the middle.

[0022] Reference numerals: 1. syringe; 2. semi-cylinder; 3. shell; 4. guide groove; 5. slide plate; 6. slide bar 1; 7. slide bar 2; 8. reversing gear; 9. reversing rack; 10. push plate; 11. draw plate; 12. handle; 101. driving rack; 102. driven shaft; 103. driving gear 1; 104. driving gear 2; 105. splined sleeve; 106. transposition cylinder; 107. splined sleeve; 108. guide strip; 109. slide groove; 201. inner gear ring; 202. driving shaft; 203. middle Heart gear; 204, planetary gear; 205, gear rack; 301, first rotating rod; 302, horizontal axis; 303, grip rod; 304, pressure rod; 305, limiting spring; 306, horizontal plate; 307, connecting plate; 308, screw rod; 309, fixed shaft; 310, end plate; 311, torsion spring; 312, one-way bearing; 313, second rotating rod; 401, shift rod; 402, shift rod support rod; 403, shift fork; 404, driving shaft; 405, annular groove; 406, magnet. DETAILED DESCRIPTION

[0023] 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.

[0024] The present invention provides an integrated intravenous syringe assembly through improvement. The technical solution of the present invention is: like Figures 1 to 10 As shown, the embodiment of the present invention provides an integrated intravenous syringe assembly, including a syringe 1 and a pumping device; the pumping device includes a semi-cylinder 2 and a shell 3, a handle 12 is fixed to the lower side of the 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 sides of the slide bar 1 6 and the slide bar 2 7, and the shell 3 is rotatably connected to the two reversing racks 9. The reversing gear 8 meshed with the rack 9, the slide bar 1 6, the slide bar 2 7, and the housing 3 are provided with a driving mechanism, and the upper side of the slide bar 1 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 slide bar 1 6 and the slide bar 2 7 and a driven shaft 102 rotatably connected to one side of the inner side of the housing 3, and the outer side of the driven shaft 102 is rotatably connected with a driving gear 1 103 and a driving gear 2 104 respectively meshed with the two driving racks 101. The driving mechanism (such as Fig.10 The drive gear 103 and the drive gear 2 104 are also provided with two spline sleeves 105 fixed at one end thereof and movably sleeved on the outside of the driven shaft 102, and a transposition cylinder 106 slidably provided on the outside of the driven shaft 102. Two spline sleeves 107 are fixed at both ends of the inner side of the transposition cylinder 106, and the two spline sleeves 107 are respectively matched with the outer sides of the two spline sleeves 105. A transposition mechanism for switching the position of the transposition cylinder 106 is provided between the transposition cylinder 106 and the housing 3, and a reduction driving mechanism for pulling the driven shaft 102 to rotate is provided on the other side of the housing 3.

[0025] Furthermore, the transposition mechanism (combined with Figure 4 and Fig.10 ) includes an annular groove 405 provided at the middle section of the outer side of the transposition cylinder 106 and a lever support rod 402 fixed to the bottom end of the inner side of the housing 3, the outer side of the lever support rod 402 is rotatably connected with a lever 401, one end of the lever 401 extends to the outer side of the housing 3, and a shift fork 403 is fixed to the other end of the lever 401, and two driving shafts 404 (such as Figure 8 shown); Through the shifting mechanism, the shifting cylinder 106 is switched to engage with the driving gear 1 103 and the driving gear 2 104 separately, so as to drive the driving gear 1 103 or the driving gear 2 104 separately. The two opposite actions of drawing and pushing can be completed by repeating the same action with one hand, and there is no need to directly draw or push the piston rod of the syringe 1 by hand, which greatly reduces the difficulty of operating the syringe 1. The operating steps of the syringe 1 can be reduced during the dispensing process, thereby improving the dispensing efficiency.

[0026] Furthermore, a plurality of guide bars 108 are fixed on the outer side of the driven shaft 102 at the position of the transposition cylinder 106, and a plurality of slide grooves 109 are provided on the inner side of the transposition cylinder 106 to slide with each guide bar 108; Through the sliding cooperation between the guide bar 108 and the slide groove 109, the transposition cylinder 106 is limited so that it can only slide in a straight line 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 driving gear 1 103 or the driving gear 2 104 through the transposition cylinder 106.

[0027] Furthermore, the reduction transmission mechanism includes a driving shaft 202 that is 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 transmitted through 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. The center position of one side of the gear rack 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 driving shaft 202. The driving shaft 202 and the second rotating rod 313 are unidirectionally rotatably connected via a one-way bearing 312 (such as Figure 1 As shown in the figure, a fixed shaft 309 is fixed to one side of the outer side of the housing 3, and a first rotating rod 301 is rotatably connected to one end of the outer side of the fixed shaft 309, a horizontal shaft 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 horizontal shaft 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; Through the reduction drive mechanism, the driven shaft 102 in the pulling and pushing device is driven to rotate, thereby realizing the function of pulling and pushing the piston rod of the syringe 1, increasing the pulling and pushing force of the piston rod of the syringe 1, so that the force required to be applied by medical staff when frequently sucking and injecting medicine during the medication process can be greatly reduced, reducing the fatigue of the medical staff's hands, and helping to improve the medication efficiency. Especially when injecting medicine into the human body, the medicine can be injected into the human body without applying a large thrust, avoiding the medical staff's hands from being sore and shaking due to long-term use of large force, causing the syringe 1 to shake, thereby improving the stability of the medicine injection, thereby improving the safety during injection.

[0028] Furthermore, 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, and both ends of the torsion spring 311 are fixedly connected to the end plate 310 and one side of the first rotating rod 301 respectively; When the grip 303 is pressed to drive the first rotating rod 301 to rotate, the rotation of the first rotating rod 301 drives one end of the torsion spring 311 to twist, so that the torsion spring 311 accumulates force. When the grip 303 is released, the torsion spring 311 applies a reverse torque to the first rotating rod 301, thereby facilitating the first rotating rod 301 and the second rotating rod 313 to rotate in the opposite direction and reset, which is convenient for medical staff to operate. When operating, the medical staff only needs to continuously press the grip 303, which greatly reduces the difficulty of frequently pulling out and pushing the piston rod of the syringe 1.

[0029] Furthermore, the force limiting mechanism includes a pressure rod 304 (such as Figure 6As 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 section of the cross plate 306, one end of the screw rod 308 is rotatably connected to a connecting plate 307, and one side of the connecting plate 307 is elastically connected to one side of the pressure rod 304 through a limiting spring 305.

[0030] The force limiting mechanism helps medical staff to judge the pressing force. When the medical staff applies too much pressing force on the grip 303, the angle between the grip 303 and the first rotating rod 301 and the second rotating rod 313 will change, which serves to remind the medical staff. The medical staff can appropriately reduce the pressing force to ensure the stability of the injection, thereby further improving the safety of the injection process.

[0031] Furthermore, a plurality of magnets 406 (such as Fig.10 As shown), the driving gear 1 103 and the driving gear 2 104 are both made of stainless steel; Under the magnetic attraction of magnet 406 on driving gear 1 103 and driving gear 2 104, when any spline sleeve 107 in the transposition cylinder 106 is sleeved on the outer side of the spline sleeve shaft 105 at the corresponding position, the transposition cylinder 106 can be attracted to the side of the corresponding driving gear 1 103 or driving gear 2 104 to prevent the spline sleeve 107 and the spline sleeve shaft 105 from falling off, thereby ensuring stability during operation.

[0032] Furthermore, a push plate 10 and a draw plate 11 for drawing and pushing the piston rod of the syringe 1 are fixed to one end of the upper side of the slide plate 5; The slide plate 5 applies a thrust to the piston rod of the syringe 1 through the push plate 10, so that the syringe 1 performs injection, and the slide plate 5 applies a pulling force to the piston rod of the syringe 1 through the draw plate 11, so that the syringe 1 performs extraction.

[0033] 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. 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; 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. When the medical staff is actually operating, they hold the handle 12 with their hands and continuously press the handle 303 of the deceleration drive mechanism. When the pressing force on the handle 303 is small, one end of the handle 303 is elastically connected to the cross plate 306 through the limiting spring 305 of the force limiting mechanism, and the limiting spring 305 and the cross plate 306 can transmit thrust to the second rotating rod 313 and the first rotating rod 301, so that the handle 303 drives the second rotating rod 313 and the first rotating rod 301 to rotate around the fixed axis 309 and The axis of the driving shaft 202 rotates, and when the second rotating rod 313 rotates, the driving shaft 202 is driven to rotate synchronously through the one-way bearing 312 that is locked in one direction, and the driving shaft 202 drives the central gear 203 to rotate. The central gear 203 drives the multiple planetary gears 204 to rotate synchronously through the meshing of teeth. When the multiple planetary gears 204 rotate, they mesh with the inner teeth of the inner gear ring 201, so that the multiple planetary gears 204 can rotate while also revolving around the central gear 203. Then the gear frame 205 is driven to rotate. Under the transmission effect between the central gear 203, the planetary gears 204 and the inner ring gear 201, the rotational angular velocity of the gear frame 205 is smaller than the rotational angular velocity of the driving shaft 202, thereby playing a deceleration role and increasing the rotational torque of the gear frame 205. The gear frame 205 transmits a larger deceleration torque to the driven shaft 102 of the pulling and pushing device, thereby respectively driving the driving gear 1 103 or the driving gear 2 104 to rotate, thereby increasing the pulling and pushing force on the slide plate 5, and then increasing the pulling and pushing force on the piston rod of the syringe 1, so that the force required to be applied by medical staff when frequently aspirating and injecting the liquid medicine during the dispensing process can be greatly reduced, reducing the fatigue of the medical staff's hands, helping to improve the efficiency of dispensing, 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 medical staff's hands from being sore and shaking due to long-term use of a large force, causing the syringe 1 to shake, improving the stability of liquid medicine injection, thereby improving the safety during injection; When the grip 303 is pressed to drive the first rotating rod 301 to rotate, the first rotating rod 301 drives one end of the torsion spring 311 to twist, so that the torsion spring 311 accumulates force. When the grip 303 is released, the torsion spring 311 applies a reverse torque to the first rotating rod 301, so that the first rotating rod 301 and the second rotating rod 313 can rotate in the opposite direction and reset, which is convenient for medical staff to operate. Medical staff only need to keep pressing the grip 303 during operation, which greatly reduces the difficulty of frequently pulling out the piston rod of the syringe 1. In order to prevent the injection speed of the liquid medicine from being too fast due to excessive force, which may cause discomfort to the patient, when the medical staff operates to press the grip rod 303, if the pressure is too large, the grip rod 303 will transfer the force to the pressure rod 304 after being stressed, and the pressure rod 304 will transfer the force to the limiting spring 305. When the force reaches a certain value, the limiting spring 305 will be compressed. At this time, the medical staff can feel the change in the angle between the grip rod 303 and the first rotating rod 301 and the second rotating rod 313, which helps the medical staff to judge the pressing force. When the angle between the grip rod 303 and the first rotating rod 301 and the second rotating rod 313 changes, the medical staff can appropriately reduce the pressing force to ensure injection stability. By rotating the screw 308 of the force limiting mechanism, the screw 308 will drive the connecting plate 307 to move, so that the connecting plate 307 compresses the limiting spring 305 to different degrees. When the limiting spring 305 is compressed more, the grip 303 needs a greater pressing force to rotate. Therefore, the upper limit of the force limit can be flexibly adjusted according to the actual injection force requirements.

[0034] 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. 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.

2. The integrated intravenous syringe assembly according to claim 1, characterized in that: 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).

3. The integrated intravenous syringe assembly according to claim 2, 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).

4. The integrated intravenous syringe assembly according to claim 2, 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).

5. 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).

6. The integrated intravenous syringe assembly according to claim 5, 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).

7. The integrated intravenous syringe assembly according to claim 5, 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).

8. 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).

9. The integrated intravenous syringe assembly according to claim 2, 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.

10. 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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