High-precision injection pump

Abstract

The high-precision injection pump comprises a shell, a needle cylinder limiting mechanism, a push rod and a push rod driving mechanism, the needle cylinder limiting mechanism comprises a limiting sunken part and a limiting shifting block, a first inserting groove matched with a skirt edge of a needle cylinder in an inserting mode is formed in the end of the limiting sunken part, and an elastic pressing block and a pressing mechanism which are used for eliminating a gap between the limiting shifting block and the needle cylinder are additionally arranged on the limiting shifting block. The first slot is additionally provided with a pressing mechanism for eliminating a gap with a needle cylinder skirt, and the push rod is additionally provided with a limiting rod, a knob and a clutch mechanism for eliminating a gap with a piston handle. By adopting the scheme, the utility model provides the high-precision injection pump which can improve the installation reliability of the injector by eliminating the installation gap so as to ensure the accuracy of the injection dosage.

Description

Technical Field

[0001] The utility model relates to the field of medical equipment, in particular to a high-precision injection pump. Background Art

[0002] The syringe pump is a common medical device that uses pulse signals to rotate the stepper motor, converts the rotational motion into linear motion through the screw, and pushes the piston of the syringe for injection and infusion. The syringe pump can accurately, evenly and continuously deliver liquids, strictly control the amount of liquid, ensure the optimal effective concentration of the fluid, and reasonably adjust the fluid injection speed.

[0003] The existing injection pump includes a shell, a syringe limiting mechanism, a push rod and a push rod driving mechanism. The syringe limiting mechanism includes a limiting recess and a limiting block. The limiting recess is arranged in the left and right direction in front of the shell and has a semicircular cross-section with an opening facing the front. A first slot is arranged at the end of the limiting recess. The limiting block is located in front of the limiting recess and cooperates with the shell to swing left and right. When the syringe is placed in the limiting recess, the skirt at the rear end of the syringe ( Figure 1 a) is inserted into the first slot, and the limit block swings from the position staggered with the syringe to the front of the syringe to form a limit fit. The push rod is provided with a piston handle ( Figure 1 b), when injecting, the push rod driving mechanism drives the push rod to move left and right, driving the piston to move relative to the syringe, thereby realizing automatic injection.

[0004] The injection pump of the above structure has the following problem. In order to make the syringe more convenient to install on the injection pump, gaps are left between the dial block and the syringe, between the first slot and the syringe skirt, and between the second slot and the piston cylinder during processing. The three gaps make the syringe not completely fixed to the injection pump. During the injection process, as the piston is acted upon by the push rod, the syringe may tilt slightly, which will directly lead to a decrease in the accuracy of the injection amount, thereby affecting the treatment effect. Summary of the invention

[0005] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a high-precision injection pump that improves the reliability of syringe installation by eliminating the installation gap, thereby ensuring the accuracy of the injection dosage.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: including a shell, a syringe limiting mechanism, a push rod and a push rod driving mechanism, the syringe limiting mechanism including a limiting recess and a limiting block, the limiting recess is arranged in the left and right directions in front of the shell and has a semicircular cross-section with an opening facing the front, the limiting recess is adapted to the shape of the syringe, the end of the limiting recess is provided with a first slot that is plugged into the syringe skirt, the limiting block is located in front of the limiting recess and cooperates with the shell to swing left and right, the push rod driving mechanism drives the push rod to move left and right, one end of the push rod serves as a driving end and is linked to the push rod driving mechanism, the other end serves as a linkage end and is provided with a push rod head, the push rod head is provided with a second slot that is plugged into the piston handle, and is characterized in that: One side of the shell located at the first slot is open and has a limiting opening. The shell is provided with a pressure plate opposite to the limiting opening and a pressing mechanism that drives the pressure plate to press on the skirt of the syringe. The other end of the limiting block that cooperates with the shell to swing is provided with an elastic clamping block that abuts against the outer wall of the syringe. A clamping mechanism that guides the elastic clamping block to move forward and backward and automatically resets backward is provided between the elastic clamping block and the limiting block. The push rod head is provided with threaded holes in the left and right directions, and a threaded limiting rod is provided in the threaded hole. One end of the limiting rod abuts against the piston handle, and the other end is provided with a knob that drives the limiting rod to rotate. A clutch structure is provided between the knob and the limiting rod to cancel the linkage between the two when the limiting rod and the piston handle abut and continue to rotate.

[0007] By adopting the above technical scheme, the pressing mechanism drives the pressure plate to press the syringe skirt against the first slot, thereby eliminating the installation gap between the syringe skirt and the first slot; the clamping mechanism automatically resets the elastic clamping block to the syringe, thereby eliminating the installation gap between the limit block and the syringe; the knob screws the screw into the threaded hole, thereby eliminating the installation gap between the second slot and the piston handle. In summary, after eliminating the three installation gaps, the installation reliability of the syringe is improved, and the problem of syringe tilting that may occur during the injection process is effectively avoided, thereby ensuring the accuracy of the injection amount. In addition, a clutch mechanism is added between the knob and the limit rod to avoid deformation of the piston handle caused by excessive tightening force of the screw, thereby ensuring accuracy and facilitating disassembly and assembly.

[0008] The utility model is further configured as follows: the pressing mechanism includes a pressing motor fixed inside the shell, a pressing plate guide rod for guiding the pressing plate to move left and right is arranged on the inner side of the shell, and the pressing motor drive is provided with a pressing screw rod parallel to the pressing plate guide rod and matched with the pressing plate thread.

[0009] By adopting the above technical solution, the pressing motor and the pressing plate guide rod cooperate with each other to stably drive the pressing plate to quickly reach the position of pressing the skirt of the syringe, thereby achieving an efficient gap filling effect.

[0010] The utility model is further configured as follows: the limit shift block is provided with a guide hole along the front-to-back direction; the clamping mechanism comprises a guide rod fixed in front of the elastic clamping block and slidably matched with the guide hole; an operating block is provided in front of the guide rod; a reset groove is provided around the guide hole at the rear of the limit shift block; and the guide rod sleeve is provided with a reset spring compressed between the reset groove and the elastic clamping block.

[0011] By adopting the above technical solution, when the limit block swings from a position staggered with the syringe to the front of the syringe, the elastic clamping block will automatically adjust the front and rear positions according to different gaps, and will also automatically adjust its own shape to complement the gap according to the different shapes of the gap, thereby obtaining a better gap filling effect.

[0012] The utility model is further configured as follows: the clutch structure includes a clutch groove circumferentially arranged on the outer periphery of the limiting rod, the knob is annular, the knob is sleeved on the outer periphery of the limiting rod and is located in the clutch groove, the clutch groove is circumferentially provided with a plurality of clutch recesses, the inner periphery of the knob is radially provided with a steel ball cavity, a radially movable steel ball and a clutch spring for resetting the steel ball to the clutch recess are arranged in the steel ball cavity.

[0013] By adopting the above technical solution, when the syringe needs to be installed, the knob is rotated. At this time, the steel ball is located in the clutch recess, and the knob and the screw are in a linkage state. The knob will drive the screw to gradually screw into the threaded hole, and when the screw and the piston handle are against each other, the screw is subjected to resistance to continued rotation. Continuing to rotate the knob will cause the steel ball to return to the steel ball cavity, canceling the linkage state between the knob and the screw, and giving a click sound feedback and vibration feedback to prompt that the installation is in place, thereby obtaining an accurate gap filling effect.

[0014] The utility model is further configured as follows: the driving end of the push rod is located in the shell and a driving seat is arranged along the front-to-back direction; the push rod driving mechanism includes a driving stepping motor and a driving guide rod; the driving guide rod is arranged in the shell along the left-right direction and slidingly cooperates with the driving seat; the driving stepping motor drives a driving screw rod which is parallel to the driving guide rod and threadedly cooperates with the driving seat.

[0015] By adopting the above technical solution, the driving stepper motor and the driving guide rod are matched to stably drive the driving seat integrated with the push rod to move left and right, so that the push rod can move accurately and stably, thereby ensuring the accuracy of the injection dosage. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a stereogram of a syringe;

[0017] Figure 2 A three-dimensional diagram of a specific implementation of the utility model;

[0018] Figure 3 It is an internal structure diagram of a specific implementation mode of the utility model;

[0019] Figure 4 for Figure 2 A magnified view of middle;

[0020] Figure 5 It is a cross-sectional view of the limit shift block;

[0021] Figure 6 for Figure 2 Enlarged view of middle B;

[0022] Figure 7 is a horizontal cross-sectional view of the limiting rod;

[0023] Figure 8 It is a radial cross-sectional view of the limiting rod. DETAILED DESCRIPTION

[0024] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. 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.

[0025] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0026] like Figure 1 — Figure 8As shown, the utility model discloses a high-precision injection pump, including a shell 1, a syringe limiting mechanism, a push rod 2 and a push rod driving mechanism. The syringe limiting mechanism includes a limiting recess 11 and a limiting shifting block 3. The limiting recess 11 is arranged in the left and right direction in front of the shell 1 and has a semicircular cross-section with an opening facing the front. The limiting recess 11 is adapted to the shape of the syringe. The end of the limiting recess 11 is provided with a first slot 12 that is plugged into the syringe skirt. The limiting shifting block 3 is located in front of the limiting recess 11 and cooperates with the shell 1 to swing left and right. The push rod driving mechanism drives the push rod 2 to move left and right. One end of the push rod 2 is used as The driving end is linked with the push rod driving mechanism, and the other end is used as the linkage end and is provided with a push rod head 21. The push rod head 21 is provided with a second slot 29 that is plugged into the piston handle. The side of the first slot 12 in the shell 1 is open and provided with a limit opening 13. The shell 1 is provided with a pressure plate 4 opposite to the limit opening 13 and a pressing mechanism that drives the pressure plate 4 to press on the skirt of the syringe. The other end of the limit block 3 that is swung with the shell 1 is provided with an elastic clamping block 31 that is against the outer wall of the syringe, and a guiding mechanism for the elastic clamping block 31 to move forward and backward is provided between the elastic clamping block 31 and the limit block 3. The push rod head 21 is provided with a threaded hole 211 along the left and right directions, and a threaded limit rod 22 is provided in the threaded hole 211. One end of the limit rod 22 is against the piston handle, and the other end is provided with a knob 23 for driving the limit rod 22 to rotate. A clutch structure is provided between the knob 23 and the limit rod 22 to cancel the linkage between the limit rod 22 and the piston handle when they are against each other and continue to rotate. The pressing mechanism drives the pressing plate 4 to press the syringe skirt into the first slot 12 to eliminate the installation gap between the syringe skirt and the first slot 12, and the pressing mechanism is used to elastically press the syringe skirt. The block 31 automatically resets to the syringe, eliminating the installation gap between the limit block 3 and the syringe. The elastic clamping block 31 is generally made of rubber. The screw is screwed into the threaded hole 211 by the knob 23 to eliminate the installation gap between the second slot 29 and the piston handle. In summary, after eliminating the three installation gaps, the installation reliability of the syringe is improved, and the problem of syringe tilt that may occur during the injection process is effectively avoided, thereby ensuring the accuracy of the injection amount. In addition, a clutch mechanism is added between the knob 23 and the limit rod 22 to avoid deformation of the piston handle caused by excessive tightening force of the screw, thereby ensuring accuracy and facilitating disassembly and assembly.

[0027] The pressing mechanism includes a pressing motor 41 fixed inside the shell 1, and a pressing plate guide rod 42 is arranged on the inner side of the shell 1 to guide the pressing plate 4 to move left and right. The pressing motor 41 drives a pressing screw 43 which is parallel to the pressing plate guide rod 42 and is threadedly matched with the pressing plate 4. The pressing motor 41 and the pressing plate guide rod 42 cooperate to stably drive the pressing plate 4 to quickly reach the position of pressing the skirt of the syringe, thereby obtaining an efficient gap filling effect. In order to ensure the movement stability, the pressing plate 4 is adapted to the shape of the inner wall of the shell 1 (at c) and forms a sliding fit.

[0028] The limit block 3 is provided with a guide hole 32 along the front-to-back direction, and the clamping mechanism includes a guide rod 33 fixed in front of the elastic clamping block 31 and slidingly matched with the guide hole 32, and an operating block 34 is provided in front of the guide rod 33, and a reset groove 321 is provided around the guide hole 32 at the rear of the limit block 3, and the guide rod 33 is sleeved with a reset spring 35 compressed between the reset groove 321 and the elastic clamping block 31. In the process of the limit block 3 swinging from the position staggered with the syringe to the front of the syringe, the elastic clamping block 31 will automatically adjust the front and rear positions according to different gaps, and will also automatically adjust its own shape to complement the gap according to the different shapes of the gap, thereby obtaining a better gap filling effect.

[0029] The clutch structure includes a clutch groove 221 circumferentially arranged on the outer periphery of the limit rod 22, and the knob 23 is annular. The knob 23 is sleeved on the outer periphery of the limit rod 22 and is located in the clutch groove 221. The clutch groove 221 is circumferentially provided with a plurality of clutch recesses 222. The inner periphery of the knob 23 is radially provided with a steel ball cavity 231. The steel ball cavity 231 is provided with a radially movable steel ball 232 and a clutch spring 233 for returning the steel ball 232 to the clutch recess 222. When the syringe needs to be installed, the rotary knob 23 is rotated. Knob 23, at this time, the steel ball 232 is located in the clutch recess 222, and the knob 23 and the screw are in a linkage state. The knob 23 will drive the screw to gradually screw into the threaded hole 211, and when the screw and the piston handle are against each other, the screw is subjected to resistance to continued rotation. Continuing to rotate the knob 23 will cause the steel ball 232 to return to the steel ball cavity 231, canceling the linkage state between the knob 23 and the screw, and giving a click sound feedback and vibration feedback to prompt that the installation is in place, thereby obtaining an accurate gap filling effect.

[0030] The driving end of the push rod 2 is located in the housing 1 and is provided with a driving seat 24 along the front-to-back direction. The push rod driving mechanism includes a driving stepping motor 25 and a driving guide rod 26. The driving guide rod 26 is provided in the housing 1 along the left-right direction and is slidably matched with the driving seat 24. The driving stepping motor 25 drives a driving screw rod 27 which is parallel to the driving guide rod 26 and is threadedly matched with the driving seat 24. The driving stepping motor 25 and the driving guide rod 26 cooperate to stably drive the driving seat 24 integrally provided with the push rod 2 to move left and right, thereby making the push rod 2 move accurately and stably, thereby ensuring the accuracy of the injection dosage. Guide rod seats 28 for fixing the driving guide rod 26 are respectively provided at both ends of the driving guide rod 26. The driving screw rod 27 passes through one of the guide rod seats 28 and is rotationally matched with the other guide rod seat 28.

Claims

1. A high-precision injection pump, comprising a shell, a syringe limiting mechanism, a push rod and a push rod driving mechanism, wherein the syringe limiting mechanism comprises a limiting recess and a limiting block, wherein the limiting recess is arranged in the left-right direction in front of the shell and has a semicircular cross-section with an opening facing forward, wherein the limiting recess is adapted to the shape of the syringe, wherein the end of the limiting recess is provided with a first slot which is plugged into the syringe skirt, wherein the limiting block is located in front of the limiting recess and cooperates with the shell to swing left and right, wherein the push rod driving mechanism drives the push rod to move left and right, wherein one end of the push rod serves as a driving end and cooperates with the push rod driving mechanism in linkage, and the other end serves as a linkage end and is provided with a push rod head, wherein the push rod head is provided with a second slot which is plugged into the piston handle, wherein the push rod driving mechanism drives the push rod to move left and right, wherein the push rod has one end which serves as a driving end and cooperates with the push rod driving mechanism in linkage, and the other end serves as a linkage end and is provided with a push rod head, and wherein the push rod head is provided with a second slot which is plugged into the piston handle, wherein the push rod has the following characteristics: One side of the shell located at the first slot is open and has a limiting opening. The shell is provided with a pressure plate opposite to the limiting opening and a pressing mechanism that drives the pressure plate to press on the skirt of the syringe. The other end of the limiting block that cooperates with the shell to swing is provided with an elastic clamping block that abuts against the outer wall of the syringe. A clamping mechanism that guides the elastic clamping block to move forward and backward and automatically resets backward is provided between the elastic clamping block and the limiting block. The push rod head is provided with threaded holes in the left and right directions, and a threaded limiting rod is provided in the threaded hole. One end of the limiting rod abuts against the piston handle, and the other end is provided with a knob that drives the limiting rod to rotate. A clutch structure is provided between the knob and the limiting rod to cancel the linkage between the limiting rod and the piston handle when they abut and continue to rotate.

2. The high-precision injection pump according to claim 1, characterized in that: The pressing mechanism includes a pressing motor fixed inside the shell, a pressing plate guide rod is arranged inside the shell to guide the pressing plate to move left and right, and the pressing motor drives a pressing screw rod which is parallel to the pressing plate guide rod and cooperates with the pressing plate thread.

3. The high-precision injection pump according to claim 1, characterized in that: The limit shift block is provided with a guide hole along the front-to-back direction, the clamping mechanism includes a guide rod fixed in front of the elastic clamping block and slidingly matched with the guide hole, an operating block is provided in front of the guide rod, a reset groove is provided around the guide hole at the rear of the limit shift block, and the guide rod sleeve is provided with a reset spring compressed between the reset groove and the elastic clamping block.

4. The high-precision injection pump according to claim 1, characterized in that: The clutch structure includes a clutch groove arranged circumferentially on the outer periphery of the limit rod, the knob is annular, the knob is sleeved on the outer periphery of the limit rod and is located in the clutch groove, the clutch groove is circumferentially provided with a plurality of clutch recesses, the inner periphery of the knob is radially provided with a steel ball cavity, the steel ball cavity is provided with a radially moving steel ball and a clutch spring for resetting the steel ball to the clutch recess.

5. The high-precision injection pump according to claim 1, characterized in that: The driving end of the push rod is located in the shell and is provided with a driving seat along the front-to-back direction. The push rod driving mechanism includes a driving stepper motor and a driving guide rod. The driving guide rod is provided in the shell along the left-right direction and is slidably matched with the driving seat. The driving stepper motor is provided with a driving screw rod which is parallel to the driving guide rod and is threadedly matched with the driving seat.

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