CN211584687U

CN211584687U - Micro-injection pump propulsion structure

Info

Publication number: CN211584687U
Application number: CN201922327429.2U
Authority: CN
Inventors: 王奇剑; 朱瓘楠
Original assignee: Beijing Xin He Feng Medical Technology Co ltd
Current assignee: Beijing Xin He Feng Medical Technology Co ltd
Priority date: 2019-12-21
Filing date: 2019-12-21
Publication date: 2020-09-29
Anticipated expiration: 2029-12-21

Abstract

The utility model discloses a microinjection pump impels structure, which comprises a housin, the casing is provided with the injection tube, the inside of injection tube is provided with the piston rod, the casing is provided with the handle that pushes away that is used for promoting the piston rod along the inner wall axial displacement of injection tube, it can dismantle with the one end that the piston rod stretches out the injection tube and be connected to push away the handle, push away handle and casing sliding connection, the casing is provided with and is used for the drive to push away the drive assembly of handle motion, drive assembly includes gear and rack and is used for drive gear and rack relative motion's motor, gear and the coaxial rotation of motor, rack and gear engagement, the length direction of rack with the direction of motion of piston rod is unanimo. It has the advantage of stable and steady injection of liquid medicine.

Description

Micro-injection pump propulsion structure

Technical Field

The utility model relates to a micro-infusion pump technical field, in particular to micro-injection pump impels structure.

Background

The micro-injection pump is a device which is convenient for continuously inputting the micro-amount of liquid medicine into a human body through an injector, the injector is arranged on the shell of the micro-injection pump through a needle cylinder of the injector, and an upper flange of the injector is embedded and clamped in an embedding groove of the shell so as to be positioned on the shell of the micro-injection pump; the piston of the injector is connected with the propelling mechanism of the micro-injection pump and continuously injects the liquid medicine into the human body under the pushing of the propelling mechanism.

In the prior art, a split nut device is generally arranged on a position of a screw rod of an injection pump, the split nut device is a so-called injection propeller and directly pushes a tailstock injected by a needle cylinder to control the tailstock to inject liquid medicine, the split nut is used for separating and engaging with the transmission of the screw rod in the injection pump, and when the injection needle cylinder is installed, a nut is separated, so that a push block of the injection pump can be freely moved, and the needle cylinder is convenient to install; and simultaneously prevents the injection pump from mistakenly injecting in a non-working state. However, because the thread profile in the split nut device is small, the split nut device has short service life and is easy to wear to cause the failure of the injection device in long-time clutch use; in addition, the phenomenon of thread buckling and dislocation can occur when the nut is clutched, so that the liquid medicine generates movement when being injected, and the injection effect of the liquid medicine is influenced.

SUMMERY OF THE UTILITY MODEL

To the deficiency that prior art exists, the utility model aims to provide a microinjection pump impels structure, it has the advantage that can stably, steadily inject the liquid medicine.

The above technical purpose of the present invention can be achieved by the following technical solutions:

the utility model provides a micro-injection pump impels structure, includes the casing, the casing is provided with the injection tube, the inside of injection tube is provided with the piston rod, the casing is provided with and is used for promoting the piston rod along the inner wall axial displacement's of injection tube push away the handle, push away the handle and can dismantle with the one end that the piston rod stretches out the injection tube and be connected, push away handle and casing sliding connection, the casing is provided with and is used for the drive to push away the drive assembly of handle motion, drive assembly includes gear and rack and is used for drive gear and rack relative motion's motor, gear and motor coaxial rotation, rack and gear engagement, the length direction of rack with the direction of motion of piston rod is.

By adopting the technical scheme, when the injection device is used, one end of the piston rod, which extends out of the injection tube, is connected with the push handle, the motor is started, the rack and the gear are meshed due to the coaxial rotation of the motor and the gear, the rack and the gear generate relative displacement under the rotation action of the motor, the drive assembly drives the push handle to move, and the push handle acts on the piston rod due to the connection of the piston rod and the push handle, so that the liquid medicine in the injection tube is pushed by the piston rod, and the liquid medicine in the injection tube is conveniently conveyed to a human body; after the injection is completed, the motor is reversely driven, the reset of the push handle is realized, the piston rod is convenient to reinstall, and therefore the distance between the push handle and the injection tube can be adjusted. The pushing handle is driven to move through the meshing of the rack and the gear, and the rack and the gear are always kept in a meshed state in the injection process, so that the liquid medicine can be stably and stably injected.

The utility model discloses further set up to: the push handle is fixedly provided with a connecting rod, the connecting rod and the piston rod are arranged on the same side of the push handle, and one end, far away from the push handle, of the connecting rod is fixedly connected with the rack.

Through adopting above-mentioned technical scheme, realize pushing away the connection of handle and rack through the connecting rod, the drive assembly of being convenient for drives and pushes away the handle motion.

The utility model discloses further set up to: the shell is provided with a guide groove, the rack is inserted into the guide groove, and the rack is connected with the guide groove in a sliding mode.

Through adopting above-mentioned technical scheme, the setting of guide way is convenient for keep the direction of motion of rack in integrative straight line, prevents that the rack from deviating from and the meshing of gear. Therefore, the rack can drive the push handle to move linearly, and the piston rod can be pushed to move axially along the inner wall of the injection tube.

The utility model discloses further set up to: and a plurality of rolling parts are arranged between the rack and the bottom wall of the guide groove.

Through adopting above-mentioned technical scheme, reduce the sliding friction power between the diapire of rack and guide way, be convenient for realize the sliding connection of rack and guide way.

The utility model discloses further set up to: the rolling part comprises a rolling shaft, one side of the rack close to the bottom wall of the guide groove is provided with a mounting groove for mounting the rolling shaft, and the rolling shaft is in rolling connection with the rack.

By adopting the technical scheme, on one hand, the friction force between rolling parts is reduced; on the other hand, the rolling piece is connected with the rack in a rotating way.

The utility model discloses further set up to: the casing is provided with a spacing subassembly that is used for keeping the injection tube spacing in the inside of U type mount pad.

Through adopting above-mentioned technical scheme, be convenient for install the injection tube on the casing through setting up spacing subassembly, increase the joint strength of injection tube and U type mount pad.

The utility model discloses further set up to: the limiting assembly comprises a limiting column, a rotating shaft and a contact, the limiting column is vertically arranged, the contact is arranged at the upper end of the limiting column, a compression elastic piece used for keeping the connection state of the contact and the injection tube is arranged at the upper end of the limiting column, and the lower end of the limiting column is rotatably connected with the shell.

Through adopting above-mentioned technical scheme, when being connected injection tube and casing, the periphery wall and the contact butt of injection tube, contact extrusion compression elastic component, compression elastic component are in the unnatural state, make the tight injection tube in contact top under the effect of compression elastic component, realize the spacing fixed to the injection tube.

The utility model discloses further set up to: the casing is provided with a U-shaped placing cavity for placing the injection tube, the U-shaped placing cavity is provided with a butt joint groove at one side close to the push handle, the end part of the push handle is in butt joint with the butt joint groove, and the push handle is in sliding connection with the butt joint groove.

Through adopting above-mentioned technical scheme, be convenient for install the injection tube, simultaneously, through pushing away handle and butt groove sliding connection, be convenient for push away the handle and drive the piston rod motion.

The utility model discloses further set up to: the push handle is provided with a limiting ring for fixing the piston rod, and the piston rod is detachably connected with the limiting ring.

By adopting the technical scheme, the end part of the piston rod is conveniently and fixedly connected with the push handle by arranging the limiting ring, so that the push handle drives the piston rod to move; the piston rod and the limiting ring are detachably connected, so that the piston rods with different specifications can be conveniently installed and replaced.

The utility model discloses further set up to: the limiting ring comprises a movable half ring and a fixed half ring, the movable half ring and the fixed half ring are arranged oppositely, the movable half ring comprises a movable end and a fixed end, the distance between the movable end and the fixed half ring is adjustable, and the movable half ring is provided with an elastic limiting part for keeping the movable half ring and the fixed half ring in a closed state.

By adopting the technical scheme, the movable end of the movable half ring is far away from the fixed half ring, the elastic limiting part is in an unnatural state, the distance between the movable half ring and the fixed half ring is increased, the end part of the piston rod is placed inside the movable half ring and the fixed half ring, the action on the movable half ring is removed, the elastic limiting part drives the movable end of the movable half ring to return to the original position, the buckling of the fixed half ring and the movable half ring is realized, and the piston rod is limited inside the limiting ring.

To sum up, the utility model discloses following beneficial effect has: through motor and gear coaxial rotation, rack and gear engagement, under the rotation effect of motor, rack and gear produce relative displacement, and drive assembly drives and pushes away the handle motion, because the piston rod with push away the handle and connect, push away the handle and act on the piston rod, realize the promotion of liquid medicine in the piston rod to the injection tube, be convenient for carry the human body with the inside liquid medicine of injection tube. The pushing handle is driven to move through the meshing of the rack and the gear, and the rack and the gear are always kept in a meshed state in the injection process, so that the liquid medicine can be stably and stably injected.

Drawings

Fig. 1 is a schematic overall structure diagram of an embodiment of the present invention;

FIG. 2 is a top view of FIG. 1;

FIG. 3 is a sectional view taken along line A-A of FIG. 2;

FIG. 4 is a schematic view of the connection between the syringe, the piston rod, the drive assembly, and the retaining ring according to an embodiment of the present invention;

FIG. 5 is an enlarged view of portion B of FIG. 4;

fig. 6 is a perspective view of the overall structure of the embodiment of the present invention.

In the figure, 1, a housing; 11. a U-shaped placing cavity; 12. a U-shaped mounting seat; 121. a clamping groove; 13. a guide groove; 2. an injection tube; 21. a limiting flange; 3. a piston rod; 31. abutting the sheet; 4. a limiting component; 41. a limiting column; 411. passing through a groove; 412. mounting grooves; 42. a rotating shaft; 43. a contact; 431. inserting the column; 432. a limiting sheet; 44. a first torsion spring; 5. a first compression spring; 6. a push handle; 7. a limiting ring; 71. a movable half ring; 72. a stationary half ring; 8. a drive assembly; 81. a gear; 82. a rack; 83. a motor; 9. a rolling member; 91. a roller; 10. a connecting rod; 20. a transition block; 201. a transverse transition block; 202. a vertical transition block.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1, for the utility model discloses a micro-injection pump impels structure, including casing 1, casing 1 is the rectangle setting, and casing 1's front side is opened and is equipped with the U type and places chamber 11, and the U type is placed the open end of chamber 11 and is outwards, and the U type is placed chamber 11 and is horizontal setting. The middle part of the U-shaped placing cavity 11 is integrally formed with a U-shaped mounting seat 12, and the opening of the U-shaped mounting seat 12 faces to the outside.

Injection tube 2 has transversely been placed to the inside of U type mount pad 12, and injection tube 2 is the cylinder type setting, and the one end of injection tube 2 is provided with the piston rod 3 along the inner wall axial displacement of injection tube 2. Injection tube 2 has spacing flange 21 (refer to fig. 4) in its one side integrated into one piece that is close to piston rod 3, and spacing flange 21 is the annular setting, and U type mount pad 12 is offered and is used for fixed spacing flange 21's joint groove 121, and spacing flange 21 is pegged graft in the inside of joint groove 121.

Referring to fig. 2 and 3, the U-shaped mounting seat 12 is provided with a limiting component 4 at an opening thereof for keeping the syringe 2 limited inside the U-shaped mounting seat 12, and the limiting component 4 includes a limiting column 41, a rotating shaft 42 and a contact 43.

Spacing post 41 is vertical setting, the lower extreme and the rotation axis 42 welding of spacing post 41, the inserting groove that supplies rotation axis 42 to pass is seted up to U type mount pad 12, spacing annular has been seted up to the inserting groove diapire, the aperture of spacing annular is greater than the aperture of inserting groove, the tip of rotation axis 42 extends to the inside of spacing annular, the one end welding that rotation axis 42 is located spacing annular has the spacing bulge loop that prevents rotation axis 42 and deviate from, rotation axis 42 rotates with the inserting groove to be connected, spacing bulge loop rotates with spacing annular to be connected. The first torsion spring 44 for keeping the limiting column 41 in a vertical state is arranged in the limiting ring groove, one torsion arm of the first torsion spring 44 is fixedly connected with the bottom wall of the limiting ring groove, the other torsion arm is fixedly connected with the rotating shaft 42, and the first torsion spring 44 is sleeved on the rotating shaft 42 positioned in the limiting ring groove.

The upper end of the limiting column 41 is provided with a contact 43 at one side close to the injection cylinder 2, the end part of the contact 43 is abutted with the peripheral wall of the injection cylinder 2, the side of the contact 43 close to the injection cylinder 2 is provided with an arc surface, and the side of the contact 43 close to the limiting column 41 is provided with a straight surface. Contact 43's straight face end integrated into one piece has grafting post 431, spacing post 41's upper end is seted up and is supplied grafting post 431 male groove 411, the mounting groove 412 has been seted up to the diapire of crossing groove 411, the aperture of mounting groove 412 is greater than the aperture of crossing groove 411, grafting post 431's tip is pegged graft in crossing groove 411 and is extended to the inside of mounting groove 412, the one end welding that grafting post 431 is located mounting groove 412 inside has spacing piece 432, be provided with the compression elastic component between the diapire of spacing piece 432 and mounting groove 412, the compression elastic component is first compression spring 5, the one end butt of first compression spring 5 is in the diapire of mounting groove 412, the other end butt is in spacing piece 432.

With reference to fig. 4 and 5, the abutting piece 31 is integrally formed at one end of the piston rod 3 extending out of the syringe 2, the housing 1 is provided with a push handle 6 for pushing the piston rod 3 to move axially along the inner wall of the syringe 2, and the push handle 6 is detachably connected with the piston rod 3. The push handle 6 is provided with a limit ring 7 for fixing the piston rod 3, and the piston rod 3 and the limit ring 7 are detachably connected.

The limiting ring 7 comprises a movable half ring 71 and a fixed half ring 72, the movable half ring 71 and the fixed half ring 72 are arranged oppositely, the movable half ring 71 comprises a movable end and a fixed end, and the distance between the movable end of the movable half ring 71 and the fixed half ring 72 is adjustable.

The fixed end of the movable half ring 71 is rotatably connected with the push handle 6 through a rotating shaft, the axis of the rotating shaft is perpendicular to the plane of the push handle 6, a hinge groove is formed in the end portion of the movable half ring 71, a first hinge hole and a second hinge hole for the rotating shaft to penetrate through are formed in the side wall of the hinge groove, the rotating shaft is far away from the push handle 6 and penetrates through the first hinge hole and the second hinge hole, and the movable half ring 71 is rotatably connected with the rotating shaft. The movable half ring 71 is provided with an elastic stopper for keeping the movable half ring 71 and the stationary half ring 72 in a closed state. The elastic limiting member is a second torsion spring (not shown in the figure), the second torsion spring is sleeved on the rotating shaft located inside the hinge groove, one torsion arm of the second torsion spring is fixedly connected with the push handle 6, and the other torsion arm of the second torsion spring is fixedly connected with the movable half ring 71.

With reference to fig. 5 and 6, the housing 1 is provided with a driving assembly 8 for driving the push handle 6 to move, the driving assembly 8 comprises a gear 81 and a rack 82 and a motor 83 for driving the gear 81 and the rack 82 to move relatively, the gear 81 and the motor 83 rotate coaxially, the rack 82 is meshed with the gear 81, and the length direction of the rack 82 is consistent with the moving direction of the piston rod 3.

The rack 82 is arranged in a rectangular shape, the rack 82 is slidably connected with the housing 1, the housing 1 is provided with a guide groove 13, the rack 82 is inserted into the guide groove 13, and the rack 82 is slidably connected with the guide groove 13.

The lower surface of the rack 82 is provided with a plurality of rolling members 9, the rolling members 9 include a roller 91, and the axial direction of the roller 91 and the axial direction of the gear 81 are arranged in parallel. The lower surface of the rack 82 is provided with an installation groove 412 for installing the roller 91, the roller 91 is installed in the installation groove 412, and the roller 91 is connected with the rack 82 in a rolling manner.

The rack 82 has the connecting rod 10 in its one side welding that is close to push away handle 6, connecting rod 10 sets up in the homonymy that pushes away handle 6 with piston rod 3, the lower extreme integrated into one piece of connecting rod 10 has transition piece 20, transition piece 20 includes horizontal transition piece 201 and vertical transition piece 202, the upper end of vertical transition piece 202 welds with one side of connecting rod 10 orientation below, the lower extreme of vertical transition piece 202 and the upper surface welding of horizontal transition piece 201, horizontal transition piece 201 and vertical transition piece 202 set up perpendicularly, one side that vertical transition piece 202 was kept away from to horizontal transition piece 201 and the lateral wall welding of rack 82.

Push away handle 6 and 1 sliding connection of casing, the U type is placed chamber 11 and has been seted up the butt groove in its one side that is close to pushing away handle 6, and the butt groove is the setting of U type, pushes away the link butt in the butt groove of handle 6 and vertical transition piece 202, and vertical groove has been seted up to the diapire in butt groove, and vertical transition piece 202 sliding connection pushes away handle 6 and butt groove sliding connection in the inside in vertical groove.

The implementation principle of the embodiment is as follows: when the injection device is used, one end of the piston rod 3 extending out of the injection tube 2 is connected with the push handle 6, the motor 83 is started, the rack 82 is meshed with the gear 81 due to the coaxial rotation of the motor 83 and the gear 81, the rack 82 and the gear 81 generate relative displacement under the rotation action of the motor 83, the rack 82 moves along the length direction of the guide groove 13, the rack 82 drives the push handle 6 to move, and the push handle 6 acts on the piston rod 3 due to the connection of the piston rod 3 and the push handle 6, so that the push of the piston rod 3 on liquid medicine in the injection tube 2 is realized, and the liquid medicine in the injection tube 2 is conveniently conveyed to a human; after the injection is completed, the motor 83 is driven reversely to reset the push handle 6, so that the piston rod 3 is convenient to reinstall, and the distance between the push handle 6 and the injection tube 2 can be adjusted. Through rack 82 and gear 81 meshing, drive and push away the motion of handle 6, in the injection process, rack 82 and gear 81 remain the engaged state throughout to can be stable, the steady injection liquid medicine.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. A micro-injection pump propelling structure comprises a shell (1), wherein an injection tube (2) is arranged on the shell (1), a piston rod (3) is arranged inside the injection tube (2), a push handle (6) used for pushing the piston rod (3) to move axially along the inner wall of the injection tube (2) is arranged on the shell (1), the push handle (6) is detachably connected with one end, extending out of the injection tube (2), of the piston rod (3), the micro-injection pump propelling structure is characterized in that the push handle (6) is in sliding connection with the shell (1), the shell (1) is provided with a driving assembly (8) used for driving the push handle (6) to move, the driving assembly (8) comprises a gear (81), a rack (82) and a motor (83) used for driving the gear (81) and the rack (82) to move relatively, the gear (81) and the motor (83) rotate coaxially, the rack (82) is meshed with the gear (81), the length direction of the rack (82) is consistent with the movement direction of the piston rod (3).

2. The micro-syringe pump propelling structure according to claim 1, wherein a connecting rod (10) is fixedly arranged on the push handle (6), the connecting rod (10) and the piston rod (3) are arranged on the same side of the push handle (6), and one end of the connecting rod (10) far away from the push handle (6) is fixedly connected with the rack (82).

3. The micro-syringe pump propelling structure according to claim 2, wherein the housing (1) is provided with a guide groove (13), the rack (82) is inserted into the guide groove (13), and the rack (82) is slidably connected with the guide groove (13).

4. A micro syringe pump advancing structure according to claim 3, wherein a plurality of rolling members (9) are provided between the rack (82) and the bottom wall of the guide groove (13).

5. The micro-syringe pump propelling structure according to claim 4, wherein the rolling member (9) comprises a roller (91), one side of the rack (82) close to the bottom wall of the guide groove (13) is provided with a mounting groove (412) for mounting the roller (91), and the roller (91) is in rolling connection with the rack (82).

6. A micro syringe pump advancing structure according to claim 1, characterized in that the housing (1) is provided with a limiting assembly (4) for keeping the syringe (2) limited inside the U-shaped mount (12).

7. A micro-syringe pump propulsion structure according to claim 6, characterized in that the limiting component (4) comprises a limiting post (41), a rotating shaft (42) and a contact (43), the limiting post (41) is vertically arranged, the contact (43) is arranged at the upper end of the limiting post (41), the upper end of the limiting post (41) is provided with a compression elastic element for keeping the contact (43) and the syringe (2) connected, and the lower end of the limiting post (41) is rotatably connected with the housing (1).

8. The micro-syringe pump propelling structure according to claim 1, wherein the casing (1) is provided with a U-shaped placing cavity (11) for placing the syringe (2), one side of the U-shaped placing cavity (11) close to the push handle (6) is provided with a butting groove, the end of the push handle (6) is butted against the butting groove, and the push handle (6) is slidably connected with the butting groove.

9. The micro syringe pump propelling structure according to claim 8, wherein the push handle (6) is provided with a limit ring (7) for fixing the piston rod (3), and the piston rod (3) and the limit ring (7) are detachably connected.

10. The micro syringe pump propelling structure according to claim 9, wherein the limiting ring (7) comprises a movable half ring (71) and a stationary half ring (72), the movable half ring (71) and the stationary half ring (72) are disposed opposite to each other, the movable half ring (71) comprises a movable end and a stationary end, a distance between the movable end and the stationary half ring (72) is adjustable, and the movable half ring (71) is provided with an elastic stopper for keeping the movable half ring (71) and the stationary half ring (72) in a closed state.