CN105903104B

CN105903104B - Reusable cassette bottle injection support

Info

Publication number: CN105903104B
Application number: CN201610400970.XA
Authority: CN
Inventors: 沈向民; 杨卫东
Original assignee: Wuxi Pulaier Medical Technology Co ltd
Current assignee: Wuxi Pulaier Medical Technology Co ltd
Priority date: 2016-06-08
Filing date: 2016-06-08
Publication date: 2022-04-08
Anticipated expiration: 2036-06-08
Also published as: CN105903104A

Abstract

The invention provides a reusable cassette bottle injection support which can solve the problems that an existing reusable injector cannot meet the requirement of disposable injection of special medicaments and the existing disposable injector is not suitable for self-injection of a patient. The front end of the cassette bottle bin is detachably provided with a needle head assembly, and the rear end of the cassette bottle bin is arranged at the front end of the sleeve type pen body; the tubular push rod can move in the sleeve type pen body, the rear end of the tubular push rod is rotatably provided with the exhaust knob, the exhaust screw cylinder is arranged in the tubular push rod, the rear end of the exhaust screw cylinder is connected with the exhaust knob in a locking manner, the ejector rod penetrates through the sleeve type pen body, the front end of the ejector rod extends into the clamping type bottle bin, the rear end of the ejector rod extends into the exhaust screw cylinder and then is in threaded connection with the inner wall of the exhaust screw cylinder, the periphery of the front end of the ejector rod is matched with the flat through hole in the center of the clamping type bottle seat, the outer circular surface of the front end of the exhaust screw cylinder is a regular variable-diameter outer circular surface and is matched with the inner circle of the front end of the tubular push rod, and therefore the front end of the tubular push rod can radially expand outwards to realize tensioning locking or relative movement with the sleeve type pen body.

Description

Reusable cassette bottle injection support

Technical Field

The invention relates to the field of medical instruments, in particular to a reusable cassette bottle injection bracket.

Background

Existing cartridge syringes include both reusable syringes and disposable syringes. The reusable injector is mainly used for injecting a single cassette type bottle medicament for multiple times, such as an insulin injection pen, and is characterized in that one cassette type bottle medicament can be injected for several times or even dozens of times according to the requirement; the problem is that air enters the cassette bottle during each injection, and for some special medicaments, air is not allowed to be mixed, so that the single injection is required to be finished, and the existing reusable cassette bottle injector cannot meet the requirement of one-time injection of the special medicaments; the existing disposable syringe needs to extract the medicament from the medicament bottle before injection, the preparation work of injection is complicated, the injection time is long, and the medicament is easily polluted in the medicament extraction and injection processes, so that the disposable syringe is not suitable for injection carried anywhere at any time and is not suitable for self-injection of patients; in addition, when the disposable injector is used for injection, the medicament in the card bottle needs to be exhausted by matching with visual inspection in a manual pressing mode, otherwise, the air in the card bottle enters the human body and influences the curative effect of the medicament and even causes harm to the body of a patient, but the exhausting step is easy to be omitted by a common patient during self-injection, and the patient is difficult to correctly master the exhausting force in the exhausting process and often has the condition that the exhausted air is not exhausted or effective medicament is exhausted due to over-great effort; in addition, the disposable syringe also has the problem of inconvenient carrying, and the disposable syringe after being used needs professional recovery, otherwise the patient can cause environmental pollution by randomly discarding after self-injection.

Disclosure of Invention

Aiming at the problems, the invention provides a reusable cassette bottle injection bracket which can solve the problem that the existing reusable injector cannot meet the requirement of disposable injection of special medicaments and can also solve the problem that the existing disposable injector is not suitable for self-injection of patients.

Its technical scheme does, repeatedly usable's cassette bottle injection support, and it includes cassette bottle storehouse, telescopic body of a brush and push rod device, cassette bottle storehouse is used for holding the cassette bottle that fills the medicament in advance, the front end detachably in cassette bottle storehouse installs the syringe needle subassembly, the rear end through cassette bottle seat install in the front end of telescopic body of a brush, its characterized in that: the push rod device comprises a tubular push rod, a push rod and an exhaust screw barrel, the tubular push rod is sleeved in the sleeve type pen body and can move back and forth in the sleeve type pen body, an exhaust knob is rotatably installed at the rear end of the tubular push rod, the exhaust screw barrel is arranged in the tubular push rod, the rear end of the exhaust screw barrel is connected with the exhaust knob in a locking manner, the push rod penetrates through the sleeve type pen body, the front end of the push rod extends into the clamping type bottle bin through the clamping type bottle seat, the rear end of the push rod extends into the exhaust screw barrel and is in threaded connection with the inner wall of the exhaust screw barrel, a flat through hole is formed in the center of the clamping type bottle seat, the periphery of the front end of the push rod is matched with the flat through hole, the outer circle surface of the front end of the exhaust screw barrel is a regular reducing diameter outer circle surface, the outer circle surface is matched with the inner circle of the front end of the tubular push rod, and the front end of the sleeve type push rod can radially expand outwards under the matching action of the reducing diameter outer circle surface to realize the pen body The bodies can be tightly locked or relatively moved.

Furthermore, the front end of the exhaust screw cylinder is provided with a head cam, the outer circular surface of the head cam is the reducing outer circular surface, the reducing outer circular surface is formed by sequentially surrounding two groups of tensioning locking outer circular surfaces and two groups of relatively movable outer circular surfaces in a clockwise direction at intervals, each group of the tensioning locking outer circular surfaces is in step surface joint with the relatively movable outer circular surfaces at the front end in the clockwise direction and is in radial groove joint with the relatively movable outer circular surfaces at the rear end in the clockwise direction, and the outer diameters of the tensioning locking outer circular surfaces are larger than the outer diameters of the relatively movable outer circular surfaces.

Furthermore, two limit semi-rings which are symmetrical in the mirror direction are arranged on the inner wall of the front end of the tubular push rod, two symmetrical elastic clamping strips are formed at the opening of the side wall of the tubular push rod between the two limit semi-rings, the outer side surface of the front end of the elastic clamping strip is provided with a clamping jaw, the inner side surface is provided with an inward flange, the bottom surface of the flange is flush with the top surface of the limit semi-ring, the bottom surface of the cam at the front end of the exhaust screw cylinder is limited by the limiting half ring, the flange is attached to the reducing outer circular surface of the cam at the head part and can be embedded and matched with the radial groove, two backstop racks are symmetrically arranged on the inner wall of the sleeve type pen body, the claws on the elastic clamping strips can be matched with the backstop teeth on the backstop racks, the tooth top surface of the stopping tooth is tangent to the radial direction of the sleeve type pen body, and the tooth bottom surface inclines to the rear end and is in a tapered shape.

Furthermore, the bottom surface of the head cam of the exhaust screw cylinder is provided with indexing holes which are uniformly distributed in the circumferential direction, the top surfaces of the two limit semi-rings are respectively provided with indexing convex points, and the indexing convex points can be matched with the indexing holes.

Furthermore, a damping spring is installed in the sleeve type pen body and sleeved on the periphery of the ejector rod, and two ends of the damping spring are respectively abutted and limited by the top surfaces of the clamping type bottle seat and the front end of the head cam of the exhaust screw cylinder.

Furthermore, the outer wall surface of the tubular push rod is provided with two parallel vertical guide grooves, the inner wall of the rear end of the sleeve type pen body is fixedly provided with a guide block, and the guide block is embedded in the vertical guide grooves.

Furthermore, the rear end of the exhaust screw cylinder is a flat end which is embedded in a flat groove of the exhaust knob, and the rear end of the exhaust screw cylinder and the exhaust knob are locked through a knob lock catch.

Furthermore, the rear end of the exhaust screw cylinder is provided with a central counter bore, the bottom surface of the flat groove of the exhaust knob is provided with a through hole, the front end surface of the knob lock catch is provided with an elastic hook, and the elastic hook of the knob lock catch extends into the through hole and then is hooked with the central counter bore so as to lock the exhaust screw cylinder and the exhaust knob.

Furthermore, a circumferential clamping groove is formed in the outer side wall of the rear end of the tubular push rod, a convex rib is arranged on the inner circumferential surface of the exhaust knob, and the convex rib is embedded in the clamping groove.

Furthermore, the clamping type bottle seat comprises a front end screw sleeve, a positioning ring and a rear end clamping sleeve which are concentrically arranged in sequence, the clamping type bottle bin is in threaded connection with the excircle of the front end screw sleeve and is limited by the front end face of the positioning ring, the front end part of the sleeve type pen body is provided with a limiting groove, the rear end clamping sleeve is provided with a limiting block, the front end of the sleeve type pen body is clamped on the excircle of the rear end clamping sleeve and is limited by the rear end face of the positioning ring, and meanwhile, the limiting block is embedded into the limiting groove.

The cassette bottle injection bracket has the beneficial effects that: the air exhaust device can be repeatedly used, can quickly and conveniently inject all the medicaments in the complete cassette bottle at one time in each use process, can quantitatively and accurately exhaust the air in the cassette bottle before injection, avoids the condition that the exhaust operation is omitted or the exhaust is not in place when a patient injects the air by himself, and ensures the injection safety; meanwhile, the self-injection syringe is convenient to store and carry and is more suitable for self-injection of patients.

Drawings

FIG. 1 is a front view schematic of a reusable cartridge injection holder of the present invention;

FIG. 2 is a perspective schematic view in elevation of a reusable cartridge injection holder of the present invention;

FIG. 3 is a schematic view of the structure of the telescoping pen body of the reusable cartridge injection holder of the present invention;

FIG. 4 is a schematic view of the tubular push rod of the reusable cartridge injection cradle of the present invention;

FIG. 5 is a schematic view of the structure of FIG. 4 in the direction A;

FIG. 6 is a schematic view of the structure of FIG. 4 in the direction B;

FIG. 7 is a schematic view of the vent screw in the reusable cartridge injection holder of the present invention;

FIG. 8 is a schematic view of the structure of FIG. 7 in the direction of C;

FIG. 9 is a schematic perspective view of a first viewing orientation of a venting knob of the reusable cartridge injection cradle of the present invention;

FIG. 10 is a perspective view of a second viewing orientation of the venting knob of the reusable cartridge injection holder of the present invention;

FIG. 11 is a perspective view of the knob lock of the reusable cartridge injection holder of the present invention;

FIG. 12 is a schematic view of the cartridge holder of the reusable cartridge injection holder of the present invention;

FIG. 13 is a schematic view of the D-direction structure of FIG. 12;

FIG. 14 is an enlarged partial view of the backstop rack in the reusable cartridge injection rack of the present invention.

Wherein, 10-clip type bottle cabin, 20-sleeve type pen body, 21-limit groove, 22-stopping rack, 231-tooth top surface, 232-tooth bottom surface, 24-damping spring, 25-guide block, 26-vertical installation groove, 30-clip type bottle seat, 31-flat through hole, 32-front end screw sleeve, 33-positioning ring, 34-rear end clip sleeve, 35-limit block, 40-tubular push rod, 41-clip groove, 42-limit half ring, 421-indexing salient point, 43-elastic clip strip, 44-claw, 45-flange, 46-vertical guide groove, 50-push rod, 60-exhaust screw cylinder, 61-flat end, 62-center counter bore, 63-head cam, 631 a-tension locking external circular surface, 631 b-tension locking external circular surface, 632 a-relatively movable outer circular surface, 632 b-relatively movable outer circular surface, 633-step surface, 634-radial groove, 635-indexing hole, 70-exhaust knob, 71-convex rib, 72-flat groove, 73-through hole, 80-knob lock catch, 81-elastic hook and 90-cap.

Detailed Description

Referring to fig. 1 and 2, the reusable cartridge injection holder of the present invention comprises a cartridge chamber 10 for accommodating a cartridge pre-filled with a medicament, a telescopic pen body 20 and a push rod device, wherein a needle assembly is detachably mounted at the front end of the cartridge chamber 10, the rear end thereof is mounted at the front end of the telescopic pen body 20 through a cartridge holder 30, the cartridge holder 30 comprises a front end screw sleeve 32 concentrically arranged in sequence, the clamping type pen container 10 is connected to the excircle threads of the front end screw sleeve 32 in a threaded mode and limited by the front end face of the positioning ring 33, the front end portion of the sleeve type pen body 20 is provided with a limiting groove 21, the rear end clamping sleeve 34 is provided with a limiting block 35, the front end of the sleeve type pen body 20 is clamped on the excircle of the rear end clamping sleeve 34 and limited by the rear end face of the positioning ring 33, and meanwhile the limiting block 35 is embedded into the limiting groove 21, so that the sleeve type pen body 20 and the clamping type bottle seat 30 cannot rotate relatively.

The push rod device comprises a tubular push rod 40, a push rod 50 and an exhaust screw cylinder 60, wherein the outer circle of the tubular push rod 40 is sleeved with the inner circle of the sleeve-type pen body 20, the tubular push rod 40 can move back and forth in the sleeve-type pen body 20, the outer side wall of the rear end of the tubular push rod 40 is provided with a circumferential clamping groove 41, as shown in figures 4 and 6, the inner circumferential surface of an exhaust knob 70 is provided with a convex rib 71, as shown in figure 9, the convex rib 71 is embedded in the clamping groove 41, and therefore the exhaust knob 70 and the tubular push rod 40 can rotate relatively; the exhaust screw 60 is arranged in the tubular push rod 40, the rear end of the exhaust screw 60 is connected with the exhaust knob 70 in a locking way through the knob lock catch 80, the rear end of the exhaust screw 60 is a flat end 61, see fig. 7, the flat end 61 is embedded in the flat groove 72 of the exhaust knob 70, so that the exhaust screw 60 can synchronously rotate along with the exhaust knob 70, the rear end of the exhaust screw, namely the flat end 61, is provided with a central counter bore 62, the bottom surface of the flat groove 72 of the exhaust knob 70 is provided with a through hole 73, the front end surface of the knob lock catch 80 is provided with an elastic hook 81, the elastic hook 81 of the knob lock catch extends into the through hole 73 and then is hooked with the step surface of the central counter bore 62, and the exhaust screw 60 is locked with the exhaust knob 70 through the knob lock catch 80; the ejector rod 50 penetrates through the sleeve type pen body 20, the front end of the ejector rod passes through the card type bottle seat 30 and then extends into the card type bottle bin 10, the rear end of the ejector rod extends into the exhaust screw cylinder 60 and is in threaded connection with the inner wall of the exhaust screw cylinder 60, a flat through hole 31 is formed in the center of the positioning ring 33 of the card type bottle seat 30, the periphery of the front end of the ejector rod 50 is matched with the flat through hole 31, when the exhaust screw cylinder 60 rotates synchronously with the exhaust knob 70, the rear end of the ejector rod 50 is in threaded connection with the inner wall of the exhaust screw cylinder 60, and the front end of the ejector rod 50 is matched with the flat through hole 31 of the card type bottle seat 30, so that the ejector rod 50 can only translate back and forth.

The front end of the exhaust barrel 60 is provided with an integrated head cam 63, the outer circular surface of the head cam 63 is a regular variable diameter outer circular surface, the variable diameter outer circular surface is formed by sequentially enclosing two groups of tensioning locking outer

circular surfaces

631a and 631b and two groups of relatively movable outer

circular surfaces

632a and 632b at intervals along the clockwise direction, the circumferential direction of each tensioning locking outer circular surface is jointed with a step surface 633 between the relatively movable outer circular surfaces at the front end along the clockwise direction and jointed with the relatively movable outer circular surfaces at the rear end along the clockwise direction through a radial groove 634, and the outer diameter R1 of the tensioning locking outer circular surface is larger than the outer diameter R2 of the relatively movable outer circular surfaces; two limiting half rings 42 which are symmetrical in a mirror direction are arranged on the inner wall of the front end of the tubular push rod 40, two symmetrical elastic clamping strips 43 are formed at the opening of the side wall of the tubular push rod 40 between the two limiting half rings 42, clamping jaws 44 are arranged on the outer side surface of the front end of each elastic clamping strip 43, inward flanges 45 are arranged on the inner side surface of each elastic clamping strip 43, the bottom surfaces of the flanges 45 are flush with the top surfaces of the limiting half rings 42, the bottom surface of a cam at the front end of the exhaust screw cylinder 60 is limited by the two limiting half rings 42, the flanges 45 are attached to the variable-diameter outer circular surface of the head cam 63 and can be matched with the radial grooves 634 in an embedding manner, two vertical mounting grooves 26 which are symmetrical to each other are formed in the inner wall of the sleeve type pen body 20, the retaining racks 22 are respectively and tightly mounted in the two vertical mounting grooves 26, the clamping jaws 44 on the elastic clamping strips 43 can be matched with the retaining teeth on the retaining racks 22, and the tooth crest 231 of the retaining teeth is tangent to the radial direction of the sleeve type pen body, The tooth bottom surface 232 is inclined to the rear end and tapered. In the process that the exhaust solenoid 60 synchronously rotates along with the exhaust knob 70, when the cam 63 at the front end of the exhaust solenoid 60 rotates until the expansion locking outer

circular surface

631a or 631b is attached to the flange 45 at the inner side of the elastic clamping strip 43, under the pushing action of the expansion locking outer

circular surface

631a or 631b and the elastic action of the elastic clamping strip 43 itself, the elastic clamping strip 43 expands outward to make the outer clamping jaws 44 completely engaged with the retaining rack 22 on the inner wall of the sleeve-type pen body 20, so that the tubular push rod 40 and the sleeve-type pen body 20 are completely expanded and locked, and at this time, the tubular push rod 40 and the sleeve-type pen body 20 can move with small clearance and cannot move relatively greatly; when the front end head cam 63 of the exhaust screw 60 is rotated to abut against the flange 45 with respect to the movable outer

circular surface

632a or 632b, the elastic clamping strip 43 is pushed by the relative movable outer

circular surface

632a or 632b to expand outward so that the claw 44 can just hook the tooth crest 231 of the stopping tooth on the stopping rack 22 on the inner wall of the sleeve-type pen body 20, at this time, since there is a gap between the claw 44 and the bottom land of the adjacent front end stopping tooth, if a forward thrust is applied to the tubular push rod 40, the claw 44 is pressed by the inclined bottom land and the tubular push rod 40 can move forward relative to the sleeve type pen body 20 by its elastic deformation, since the tooth crest 231 of each stopping tooth is tangent to the radial direction of the sleeve type pen body, if the tubular push rod 40 is pulled backwards, the claw 44 is prevented by the tooth crest of the stopping tooth, and the tubular push rod 40 cannot move backwards relative to the sleeve type pen body 20; when the cam 63 at the front end of the exhaust screw barrel 60 rotates until the flange 45 is embedded in the radial groove 634, the elastic clamping strip 43 does not generate the outward expansion elastic deformation, the claw 44 is completely separated from the retaining rack 22, and the tubular push rod 40 can freely move in the sleeve type pen body 20.

The bottom surface of the head cam of the exhaust screw cylinder 60 is provided with indexing holes 635 which are uniformly distributed in the circumferential direction, the top surfaces of the two limit half rings 42 are respectively provided with indexing salient points 421, and the indexing salient points 421 can be matched with the indexing holes 635; because the tubular push rod 40 can not rotate along with the exhaust screw cylinder 60, when the exhaust screw cylinder 60 rotates by a fixed angle alpha (alpha is a central angle between two adjacent index holes), the index salient point 421 can fall into the next index hole from the previous index hole along the rotation direction, and the rotation angle of the exhaust screw cylinder 60 and the linear moving distance of the mandril 50 have a quantitative proportional relationship, so that the moving distance of the mandril 50 driven by the exhaust screw cylinder 60 can be accurately controlled by setting the number of the index holes 635, and the mandril 50 can accurately control the exhaust amount by pushing the plunger of the cassette bottle; in this embodiment, twelve index holes 635 are provided.

The sleeve type pen body 20 is internally provided with a damping spring 24, the damping spring 24 is sleeved on the periphery of the ejector rod 50, two ends of the damping spring 24 are respectively abutted and limited by the bottom surface of the positioning ring 33 of the clamping type bottle seat 30 and the top surface of the front end of the head cam 63 of the exhaust screw cylinder 60, and the exhaust screw cylinder 60 and the tubular push rod 40 can be quickly moved backwards to reset by the rebound action of the damping spring 24 when the flange 45 on the inner side of the elastic clamping strip 43 is embedded into the radial groove 634 on the excircle of the head cam 63.

Two parallel vertical guide grooves 46 are formed in the outer wall surface of the tubular push rod 40, a guide block 25 is fixedly arranged on the inner wall of the rear end of the sleeve type pen body 20, and the guide block 25 is embedded in the vertical guide grooves 46, so that the moving reliability between the tubular push rod 40 and the sleeve type pen body 20 is guaranteed, and the relative rotation between the tubular push rod 40 and the sleeve type pen body 20 due to a gap is avoided.

For ease of understanding, the front and rear ends of the present invention are shown in the orientation of the present invention with reference to the barrel 20, with the end facing the needle assembly being the front end and the opposite end being the rear end.

The following describes in detail the use of the invention:

(1) when the exhaust knob 70 is rotated counterclockwise to the bottom, the exhaust screw 60 rotates synchronously with the exhaust knob 70 to drive the ejector rod 50 to retreat to the initial position, and the flange 45 on the inner side of the elastic clamping strip 43 of the tubular push rod is embedded into the radial groove 634 of the cam 63 at the front end of the exhaust screw 60, the exhaust screw 60 and the tubular push rod 40 are ejected out of the sleeve-type pen body 20 integrally and quickly under the resilience of the damping spring 24, at this time, the flange 45 on the inner side of the elastic clamping strip of the tubular push rod is attached to the tightening locking outer

circular surfaces

631a and 631b of the outer circle of the head cam 63 at the front end of the exhaust screw 60, and only small-gap micro-movement but large-amplitude relative movement between the tubular push rod 40 and the sleeve-type pen body 20 can be performed, that is, the tubular push rod 40 cannot perform injection under this state;

(2) screwing the cassette bottle bin 10 off from the front end threaded sleeve 32 of the cassette bottle seat 30, then putting the cassette bottle pre-filled with the medicament into the cassette bottle bin 10, then connecting and assembling the rear end of the cassette bottle bin 10 and the front end threaded sleeve 32 of the cassette bottle seat 30 in a threaded manner, and assembling the needle head assembly at the front end of the cassette bottle bin;

(3) the tubular push rod 40 is slightly pressed forwards, the tubular push rod 40 drives the exhaust screw cylinder 60 and the push rod 50 to move forwards together until the front end of the push rod 50 contacts the top surface of the bottle clamping plunger, and at the moment, the flange 45 on the inner side of the elastic clamping strip of the tubular push rod is still attached to the tensioning locking outer

circular surfaces

631a and 631b of the outer circle of the head cam 63 on the front end of the exhaust screw cylinder 60, so that the tubular push rod 40 is pushed to be incapable of injecting; then the exhaust knob 70 is rotated clockwise to drive the exhaust screw barrel 60 to rotate, the exhaust screw barrel 60 drives the ejector rod 50 to move forward to push the cassette bottle plunger to complete exhaust, in the embodiment, the exhaust knob 70 can be rotated clockwise one-twelfth to three-twelfth circles according to the exhaust requirement, wherein 2 units of exhaust can be realized by rotating one-twelfth circle; while the exhaust screw cylinder 60 rotates and pushes the push rod 50 to move forward, the head cam 63 synchronously rotates, so that the flange 45 on the inner side of the elastic clamping strip of the tubular push rod is switched from a state of being attached to the tensioning locking outer circular surface 631a/631b to a state of being attached to the relatively movable outer circular surface 632a/632 b;

(4) the sleeve type pen body 20 is tightly held, the tubular push rod 40 is pressed forwards, at the moment, because the flange 45 on the inner side of the elastic clamping strip of the tubular push rod is in a state of being attached to the relatively movable outer circular surface 632a/632b, the clamping jaw 44 is extruded by the inclined tooth bottom surface and under the action of self elastic deformation and the structural influence of the backstop teeth on the backstop rack, the tubular push rod 40 can only move forwards and cannot reversely withdraw, so that the injection is finished, and the tubular push rod 40 cannot be ejected backwards by the damping spring no matter how many doses are injected;

(5) after injection is completed, the clamping claws 44 of the elastic clamping strips on the tubular push rod are locked at the front ends of the retaining racks, the needle head assembly is detached from the front end of the cassette bottle bin 10, and then the pen cap 90 is sleeved on the cassette bottle bin 10, so that the whole cassette bottle injection bracket is shortest in length and convenient to store;

when the cassette bottle injection bracket needs to be used repeatedly, the steps are repeated.

Claims

1. Reusable card bottle injection support, it includes card bottle storehouse, telescopic body of a brush and push rod device, card bottle storehouse is used for holding the card bottle that has filled the medicament in advance, the front end detachably in card bottle storehouse install the syringe needle subassembly, the rear end through card bottle seat install in the front end of telescopic body of a brush, its characterized in that: the push rod device comprises a tubular push rod, a push rod and an exhaust screw barrel, the tubular push rod is sleeved in the sleeve type pen body and can move back and forth in the sleeve type pen body, an exhaust knob is rotatably installed at the rear end of the tubular push rod, the exhaust screw barrel is arranged in the tubular push rod, the rear end of the exhaust screw barrel is connected with the exhaust knob in a locking manner, the push rod penetrates through the sleeve type pen body, the front end of the push rod extends into the clamping type bottle bin through the clamping type bottle seat, the rear end of the push rod extends into the exhaust screw barrel and is in threaded connection with the inner wall of the exhaust screw barrel, a flat through hole is formed in the center of the clamping type bottle seat, the periphery of the front end of the push rod is matched with the flat through hole, the outer circle surface of the front end of the exhaust screw barrel is a regular reducing diameter outer circle surface, the outer circle surface is matched with the inner circle of the front end of the tubular push rod, and the front end of the sleeve type push rod can radially expand outwards under the matching action of the reducing diameter outer circle surface to realize the pen body The bodies are locked by tension or can move relatively;

the front end of the exhaust screw cylinder is provided with a head cam, the outer circular surface of the head cam is the variable-diameter outer circular surface, the variable-diameter outer circular surface is formed by sequentially enclosing two groups of tensioning locking outer circular surfaces and two groups of relatively movable outer circular surfaces at intervals along a clockwise direction, the circumferential direction of each tensioning locking outer circular surface is in stepped surface joint with the relatively movable outer circular surface at the front end along the clockwise direction and is in radial groove joint with the relatively movable outer circular surface at the rear end along the clockwise direction, and the outer diameter of each tensioning locking outer circular surface is larger than that of the relatively movable outer circular surface;

two mirror-symmetrical limiting semi-rings are arranged on the inner wall of the front end of the tubular push rod, two symmetrical elastic clamping strips are formed at the side wall opening of the tubular push rod between the two limiting semi-rings, the outer side surface of the front end of the elastic clamping strip is provided with a clamping jaw, the inner side surface is provided with an inward flange, the bottom surface of the flange is flush with the top surface of the limit semi-ring, the bottom surface of the cam at the front end of the exhaust screw cylinder is limited by the limiting half ring, the flange is attached to the reducing outer circular surface of the cam at the head part and can be embedded and matched with the radial groove, two backstop racks are symmetrically arranged on the inner wall of the sleeve type pen body, the claws on the elastic clamping strips can be matched with the backstop teeth on the backstop racks, the tooth top surface of the stopping tooth is tangent to the radial direction of the sleeve type pen body, and the tooth bottom surface is inclined towards the rear end and is in a tapered shape;

the bottom surface of the head cam of the exhaust screw cylinder is provided with indexing holes which are uniformly distributed in the circumferential direction, and the top surfaces of the two limit semi-rings are respectively provided with indexing convex points which can be matched with the indexing holes;

the rear end of the exhaust screw cylinder is a flat end which is embedded in a flat groove of the exhaust knob, and the rear end of the exhaust screw cylinder and the exhaust knob are locked through a knob lock catch;

a damping spring is arranged in the sleeve type pen body and sleeved on the periphery of the ejector rod, and two ends of the damping spring are respectively abutted and limited by the top surfaces of the clamping type bottle seat and the front end of the head cam of the exhaust screw cylinder;

the outer wall surface of the tubular push rod is provided with two parallel vertical guide grooves, the inner wall of the rear end of the sleeve type pen body is fixedly provided with a guide block, and the guide block is embedded in the vertical guide grooves.

2. The reusable cartridge injection rack of claim 1, wherein: the rear end of the exhaust screw cylinder is provided with a central counter bore, the bottom surface of the flat groove of the exhaust knob is provided with a through hole, the front end surface of the knob lock catch is provided with an elastic hook, and the elastic hook of the knob lock catch is hooked with the central counter bore after extending into the through hole so as to lock the exhaust screw cylinder and the exhaust knob.

3. The reusable cartridge injection rack of claim 2, wherein: the outer side wall of the rear end of the tubular push rod is provided with a circumferential clamping groove, the inner circumferential surface of the knob lock catch is provided with a convex rib, and the convex rib is embedded in the clamping groove.

4. The reusable cartridge injection rack of claim 1, wherein: the clamping type bottle seat comprises a front end screw sleeve, a positioning ring and a rear end clamping sleeve which are concentrically arranged in sequence, the clamping type bottle bin is in threaded connection with the excircle of the front end screw sleeve and is limited by the front end face of the positioning ring, the front end part of the sleeve type pen body is provided with a limiting groove, the rear end clamping sleeve is provided with a limiting block, the front end of the sleeve type pen body is clamped on the excircle of the rear end clamping sleeve and is limited by the rear end face of the positioning ring, and meanwhile, the limiting block is embedded into the limiting groove.