WO2018152771A1 - 具有剂量控制功能的注射推进机构 - Google Patents

具有剂量控制功能的注射推进机构 Download PDF

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Publication number
WO2018152771A1
WO2018152771A1 PCT/CN2017/074771 CN2017074771W WO2018152771A1 WO 2018152771 A1 WO2018152771 A1 WO 2018152771A1 CN 2017074771 W CN2017074771 W CN 2017074771W WO 2018152771 A1 WO2018152771 A1 WO 2018152771A1
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WO
WIPO (PCT)
Prior art keywords
tube
sleeve
dose control
screw
shaft tube
Prior art date
Application number
PCT/CN2017/074771
Other languages
English (en)
French (fr)
Inventor
叶进民
Original Assignee
群康生技股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 群康生技股份有限公司 filed Critical 群康生技股份有限公司
Priority to PCT/CN2017/074771 priority Critical patent/WO2018152771A1/zh
Priority to US16/487,935 priority patent/US20200046906A1/en
Priority to CN201780087200.7A priority patent/CN110382021B/zh
Publication of WO2018152771A1 publication Critical patent/WO2018152771A1/zh

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
    • A61M5/31533—Dosing mechanisms, i.e. setting a dose
    • A61M5/31535—Means improving security or handling thereof, e.g. blocking means, means preventing insufficient dosing, means allowing correction of overset dose
    • A61M5/31536—Blocking means to immobilize a selected dose, e.g. to administer equal doses
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/20—Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically
    • A61M5/2033—Spring-loaded one-shot injectors with or without automatic needle insertion
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/24—Ampoule syringes, i.e. syringes with needle for use in combination with replaceable ampoules or carpules, e.g. automatic
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
    • A61M5/31533—Dosing mechanisms, i.e. setting a dose
    • A61M5/31545—Setting modes for dosing
    • A61M5/31548—Mechanically operated dose setting member
    • A61M5/3155—Mechanically operated dose setting member by rotational movement of dose setting member, e.g. during setting or filling of a syringe
    • A61M5/31551—Mechanically operated dose setting member by rotational movement of dose setting member, e.g. during setting or filling of a syringe including axial movement of dose setting member

Definitions

  • the invention relates to an injection pen, in particular to an injection propulsion mechanism which is applied to the injection pen, provides a dose control function, and can automatically brake and lock after reaching the number of uses, so that the injection pen cannot be reused.
  • metering type injection pen Based on the safety regulations for drug injection, existing pens have a limited number of reusable functions.
  • the existing injection pens are divided into two types: a metering type injection pen and a counting type injection pen.
  • the meter type injection pen is a push rod action of pressing the back end of the injection pen after assembling the medicine bottle.
  • the piston in the medicament bottle is moved by a certain stroke distance by the interlocking control of the internal drive mechanism, and the pre-dose medicament is output through the needle.
  • the existing metering type pen can achieve the function of quantitatively outputting the medicine, or further has the effect of saving labor
  • the driving mechanism in the injection pen can still be operated after the medicine of the injection pen is used up in the medicine bottle. It has not been locked, causing users to continue to misuse and have problems with insufficient security.
  • Today's pens further provide automatic locking to ensure safe use.
  • the existing automatic locking function of the injection pen still has shortcomings, which needs to be further improved, in order to provide a more practical injection pen to the user.
  • the technical problem to be solved by the present invention is to provide an injection propulsion mechanism with a dose control function, which solves the problem that the automatic locking function of the existing injection pen is insufficient.
  • the technical solution proposed by the present invention is to provide an injection propulsion mechanism for an injection pen, which comprises a dose control component, an operation component, an injection advancement component and a clutch backstop component, wherein:
  • the dose control component is comprised of:
  • An outer tube having an axially extending outer tube intermediate hole, the hole wall of the outer tube forming a spiral ridge;
  • a dose control screw rotatably mounted in the outer tube of the outer tube, the dose control screw comprising a screwing section having a spiral groove and a screw tube at the rear end of the screwing section An end portion, the spiral groove of the screwing portion is screwed with the spiral rib of the outer tube, and the axial hole of the spiral tube is formed in the dose control screw, and the rear hole of the hole wall of the screw tube is arranged a plurality of axially extending grooves;
  • a drive sleeve is disposed in the bore of the solenoid of the dose control screw, the drive sleeve includes a sleeve front section and a sleeve rear section located behind the front section of the sleeve, the sleeve is formed in the front section a first space opening toward the front, a second space opening toward the rear is formed in the rear section of the sleeve, and a peripheral wall of the rear section of the sleeve forms at least one slot radially communicating with the second space, and Forming a snap-up piece in the slot, the card-shaped piece can be pushed and clamped into a corresponding groove in the dose control screw, and the front end of the drive sleeve forms a spiral end;
  • a screwing tube is disposed in the dose control screw, the rear end of the screwing tube is fixed to the front end of the driving sleeve, and an axially through sleeve hole is formed in the screwing tube, the screwing tube
  • the utility model comprises a threaded screwing section and a ring flange at the front end of the screwing section;
  • a dose control nut having a threaded hole, the dose control nut being disposed in the dose control screw, and being screwed to the screwing section of the screw tube, the dose control nut being located in front of the drive sleeve
  • the rear end of the dose control nut forms a spiral limiting portion, and the spiral limiting portion can be matched with the screw end of the front end of the driving sleeve to be limited;
  • the operating component is disposed at a rear end of the dose control component, the operating component includes an operating member, a compression spring, and a pressing member, the operating member includes a card portion and a card end portion at a rear end of the card portion.
  • the insertion plate portion is inserted into the second space of the driving sleeve, and can push the clamping elastic piece to be engaged in a corresponding groove in the dose control screw, and the insertion plate end is located at the driving
  • the outer side of the rear end of the sleeve can extend into the rear end portion of the screw of the dose control screw, and the compression spring is sleeved on the outer side of the inserting portion of the operating member, and the two ends of the compression spring respectively abut the driving sleeve a rear end of the tube and the end of the inserting plate, the pressing member is sleeved and disposed outside the end of the inserting plate at the rear end of the operating member;
  • the injection propulsion assembly is disposed at a front end of the dose control assembly, and the injection propulsion assembly comprises a shaft tube, a push rod and a push block, wherein the shaft tube has an axial through hole, the shaft tube includes an axis a tube body and a front end portion of the shaft tube at the front end of the shaft tube body, the shaft tube body of the shaft tube being mounted in the screw tube, the shaft tube being linearly movable relative to the screw tube axial direction, the shaft tube a front end portion is located in front of the screw tube and the dose control screw, the push The rod is mounted in the shaft hole of the shaft tube and can move linearly with respect to the axial direction of the shaft tube and rotate together with the shaft tube.
  • the outer peripheral wall of the push rod is formed with a push rod thread, and the push block is disposed on the push rod Front end of rod
  • the clutch backstop assembly is disposed inside the front section of the outer tube and is located in front of the dose control assembly and assembled with the injection propulsion assembly, the clutch backstop assembly comprising:
  • a front casing fixed to the inside of the front end of the outer pipe the rear end of the front casing has a set of shell back plates, and a set of shell screw holes is formed in the casing back plate, and the push rod of the injection propulsion assembly is arranged on the In the sleeve screw hole, a rear end surface of the sleeve back plate forms a first ratchet gear portion on a periphery of the sleeve screw hole, and the first ratchet gear portion has a plurality of annular oblique single oblique teeth;
  • a clutch member movably disposed in the rear sleeve, wherein the clutch member defines a middle hole and is axially movably sleeved on the front end portion of the shaft tube of the shaft tube, and the clutch member can
  • the shaft tube rotates together
  • the front end of the clutch member has a second ratchet gear portion
  • the second ratchet gear portion has a plurality of annular oblique single-angled ratchet teeth
  • the second ratchet gear portion can be coupled with the front sleeve
  • the first ratchet gear portion of the rear end of the shell is relatively engaged and disengaged;
  • a push-up spring is disposed in the rear sleeve and sleeved on the front end portion of the shaft tube of the shaft tube, and the front and rear ends of the push-up spring respectively abut the clutch member and the shaft tube.
  • the dose control solenoid forms a formed toothed ring portion having a plurality of engaging teeth with respect to the circumferential wall behind the groove at the rear end portion of the solenoid.
  • the driving sleeve forms a plurality of latches at the rear end of the rear section of the sleeve, and the plurality of latches are respectively engaged with the locking ring portions of the rear end portion of the coil.
  • the outer tube forms at least one limit chute in the rear hole wall of the middle hole of the outer tube; the screwing section of the dose control screw is connected to the rear end of the screw
  • the outer peripheral wall of the section is formed with at least one limiting oblique protrusion, and the limiting oblique protrusion can be aligned with the limiting inclined groove of the outer tube.
  • the front end of the screwing section of the dose control screw forms a resilient buckle, and the screwing tube is restrained by the elastic buckle.
  • the side wall of the sleeve front section of the drive sleeve is provided with at least one snap hole
  • the screw tube has a combination portion at the rear end of the screwing section, the combination The portion has a plurality of grooves extending axially from the rear end thereof, and the outer peripheral surface of the combination portion is formed with at least one snap projection, and the combination portion is inserted into the front portion of the sleeve of the drive sleeve.
  • the card engaging protrusions are combined with the corresponding engaging holes for engaging and fitting.
  • the end of the locking elastic piece of the driving sleeve has a projection
  • the locking elastic piece is provided with a limiting convex portion behind the protruding block
  • the inserting portion of the operating member The front end has a push-up bump
  • the rear end of the push-up bump has a bump end
  • the push-up bump is located between the bump and the limiting protrusion
  • the pitch of the screwing section of the screwing tube is smaller than the pitch of the spiral groove of the dose control screw, and the pitch of the pusher thread is smaller than that of the spiral groove of the dose control screw a pitch, and the pitch of the pusher thread is greater than the pitch of the thread of the screwing section of the screw.
  • the outer peripheral wall of the push rod forms at least one push rod guide groove extending axially and passing through the push rod thread
  • the shaft hole hole wall of the shaft tube forms at least one axial extension.
  • a shaft guiding rib the shaft guiding rib correspondingly extending into the push rod guiding groove
  • the outer peripheral wall of the front end portion of the shaft tube of the shaft tube forming at least one axially extending leading groove
  • the shaft tube body Forming at least one axially extending rear guiding groove in the outer peripheral wall, wherein at least one axially extending guiding rib is formed in the sleeve hole of the screwing tube, and the rear guiding groove and the sleeve hole in the screwing tube
  • the guiding rib is matched;
  • the dose control coil forms a plurality of axially extending ribs on the peripheral wall of the hole in the front section of the spiral tube, and the ring flange at the front end of the screw tube forms at least one axial
  • the shaft tube has an annular convex portion between the shaft tube body and the front end portion of the shaft tube, and the annular convex portion is located between the screwing tube and the dose control screw a front sleeve; a sleeve having a movable slot and a rear end plate at a rear end of the sleeve, wherein the rear end plate defines a hole for end plate communication of the movable slot, the shaft of the shaft tube
  • the tube body is disposed in the end plate perforation, the front end portion of the shaft tube of the shaft tube and the annular convex portion are located in the movable groove of the rear sleeve, the rear end plate is located behind the annular convex portion of the shaft tube and the dose
  • the clutch member and the ejector spring are located in the movable slot, and the rear end of the ejector spring abuts against the annular protrusion of the shaft
  • the injection propulsion mechanism mainly utilizes a combination configuration of a dose control component, an operation component, an injection propulsion component and a clutch backstop component, so that the injection propulsion mechanism is applied to the injection bottle to connect the medicament bottle.
  • the injection propulsion mechanism when the pen is reused for a certain number of times, it can provide automatic locking.
  • the function of re-use wherein after the dose control nut is driven to spiral back a predetermined number of times, the spiral limit portion of the rear end of the dose control nut is engaged with the screw end of the front end of the drive sleeve to be engaged.
  • the driving sleeve passes through the shaft tube as a card for engaging the front sleeve and the clutch of the clutching and stopping assembly.
  • the system can not be rotated, and the dose control screw is pinned by the dose control nut, so that the dose control screw can no longer be rotated backwards to generate an automatic locking function.
  • the liquid medicine in the medicine bottle is also used up. Therefore, the user is prompted that the pen must be discarded altogether to ensure the safety of the pen.
  • FIG. 1 is a perspective exploded view of a preferred embodiment of an injection propulsion mechanism having a dose control function according to the present invention.
  • FIG. 2 is a perspective exploded view of another perspective view of the preferred embodiment of the injection propulsion mechanism of FIG. 1.
  • FIGS. 1 and 2 are side cross-sectional views showing the preferred embodiment of the injection propulsion mechanism shown in FIGS. 1 and 2.
  • FIGS. 4 is an enlarged perspective exploded view of the dose control solenoid, the drive sleeve, the screw tube, and the dose control nut in the preferred embodiment of the injection advancement mechanism of FIGS. 1 and 2.
  • FIG. 5 is an enlarged perspective exploded view of the shaft tube, the push rod and the clutch backstop assembly in the preferred embodiment of the injection propulsion mechanism shown in FIGS. 1 and 2.
  • Figure 6 is a partial perspective view showing the clutching and stopping assembly of the preferred embodiment of the injection propulsion mechanism of Figure 1 in an engaged state.
  • Figure 7 is a partial perspective view showing the clutching and stopping assembly of the preferred embodiment of the injection propulsion mechanism of Figure 1 in a disengaged state.
  • Figure 8 is a side cross-sectional view showing the preferred embodiment of the injection advancement mechanism of Figure 1 applied to an injection pen.
  • Figure 9 is a side cross-sectional view of the injection pen of Figure 8 with the cover removed and the needle cover.
  • Figure 10 is a side elevation, partial cross-sectional view of the preferred embodiment of the injection advancement mechanism of the present invention prior to injection.
  • Figure 11 is a side elevation, partial cross-sectional view of the preferred embodiment of the injection advancement mechanism of the present invention with the operating assembly stretched rearwardly.
  • Figure 12 is a side elevation, partial cross-sectional view showing the preferred embodiment of the injection advancement mechanism of the present invention with the operating assembly being pressed forward.
  • Figure 13 is a side elevational cross-sectional view showing the preferred embodiment of the injection propulsion mechanism of the present invention in a locked state after reaching the number of uses.
  • the injection propulsion mechanism 1 includes a dose control assembly 10, An operating assembly 20, an injection propulsion assembly 30, and a clutch backstop assembly 40.
  • the dose control assembly 10 includes an outer tube 11, a dose control screw 12, a drive sleeve 13, a screw tube 14, and a dose control nut 15.
  • an outer tube inner hole 111 is formed in the outer tube 11, and a hole rib 112 is formed in the hole wall of the outer tube hole 111.
  • the outer tube 11 protrudes from the front wall of the outer tube hole 111 to extend at least one axially extending fixing rib 113, or further forms a plurality of annular grooves in the front wall of the outer tube intermediate hole 111.
  • a through hole 114 is formed in the wall of the outer tube 11 and extends through the hole 111 in the outer tube.
  • the outer tube 11 can also form at least one limiting chute 115 in the rear wall of the outer hole 111.
  • the dose control screw 12 is rotatably mounted in the outer tube 11, and an axially-through solenoid hole 121 is formed in the dose control solenoid 12, and the dose control is performed.
  • the screw 12 includes a screwing section 122 and a screw rear end portion 123 at the rear end of the screwing section 122.
  • the outer peripheral surface of the screwing section 122 forms a spiral groove 124, and the screwing section 122 of the dose control screw 12 is screwed to
  • the outer tube of the outer tube 11 is in the middle hole 111, and the spiral rib 112 is screw-fitted with the spiral groove 124, and the rear end portion 123 of the screw is located outside the rear end of the outer tube 11.
  • the outer peripheral wall of the segment connecting the rear end portion 123 of the screw portion forms at least one limiting oblique protrusion 126, and the limiting oblique protrusion 126 can be limited to the outer tube 11.
  • the bit chute 115 is aligned in place.
  • the front end of the screwing section 122 of the dose control screw 12 can also form a resilient buckle 127.
  • the dose control screw 12 forms a plurality of axially extending ribs 12a on the peripheral wall of the hole in the front section of the hole 121 of the solenoid.
  • the control screw 12 forms a plurality of axially extending grooves 128 in the peripheral wall of the hole in the rear section of the hole 121 in the solenoid.
  • a locking toothed ring portion 129 having a plurality of locking teeth is formed in the spiral valve rear end portion 123 with respect to the circumferential wall of the screw hole 121 at the rear of the groove 128.
  • the driving sleeve 13 is disposed in a solenoid hole 121 of the dose control solenoid 12, and the driving sleeve 13 includes a sleeve front section 131 and a sleeve rear section 132.
  • a first space 133 having an opening facing forward is formed in the front portion 131 of the sleeve of the driving sleeve 13
  • a second space 134 opening rearward is formed in the rear portion 132 of the sleeve, in the first space 133 and the second space.
  • a partition portion 135 may be formed between the 134s, and the peripheral wall of the sleeve rear portion 132 forms at least one slot 136 radially communicating with the second space 134, and a card is formed in the slot 136.
  • the spring tab 137, the front end of the snap tab 137 is a free end, and the snap tab 137 can be pushed and yawed radially outwardly to be engaged in the corresponding slot 128 in the dose control solenoid 12.
  • the locking elastic piece 137 has a protrusion 138 at the end, and the locking elastic piece 137 is further disposed with a limiting protrusion 138a behind the protrusion 138.
  • the driving sleeve 13 forms a plurality of spring buckles at the rear end of the sleeve rear section 132. 13b, the driving sleeve 13 is mounted in the dose control screw 12, and the plurality of latches 13b at the rear end of the driving sleeve 13 are respectively engaged with the locking ring gear portion 129 of the screw rear end portion 123.
  • the front end of the driving sleeve 13 is formed with a spiral end portion 139.
  • the side wall of the sleeve front portion 131 is provided with at least one engaging hole 13a, and the second space 134 is a rectangular hole.
  • the screwing tube 14 is installed in the dose control screw 12, and the rear end of the screwing tube 14 is connected to the front end of the driving sleeve 13, and is received by the dose control screw 12.
  • the front end of the elastic buckle 127 is limited, and an axially through sleeve hole 141 is formed in the screw tube 14 , and an axially extending guiding rib 142 is formed on the hole wall of the sleeve hole 141 .
  • the front end of the pipe 14 forms a radially protruding ring flange 143.
  • the outer circumferential surface of the ring flange 143 forms a ring groove 149, and the ring flange 143 defines at least one axially extending groove 148.
  • the screwing tube 14 includes a threaded screwing section 144 having a pitch smaller than the pitch of the helical groove 124 of the dose control solenoid 12, and the screwing tube 14 is at the rear end of the screwing section 144.
  • the combination portion 145 has a plurality of slits 146 extending axially from the rear end thereof toward the front side, so that the combined portion 145 can be radially contracted and reset, and the outer portion of the combination portion 145 is At least one latching protrusion 147 is formed on the surface, and the screwing tube 14 is inserted into the sleeve front section 131 of the driving sleeve 13 by the combining portion 145, and the concave-convex fitting of the engaging hole 13a corresponding to the engaging protrusion 147 is utilized. And combined with one.
  • the dose control nut 15 has a screw hole 151 , and the dose control nut 15 is disposed in the dose control screw 12 and is screwed to the screw tube 14 .
  • a screwing section 144 is located in front of the drive sleeve 13.
  • the rear end of the dose control nut 15 forms a spiral limiting portion 152.
  • the spiral limiting portion 152 can cooperate with the screw end portion 139 of the front end of the driving sleeve 13, and the outer peripheral wall of the dose control nut 15 can also form at least one An axially extending slot 153 that engages the rib 12a in the dose control solenoid 12 to interlock the dose control nut 15 with the dose control solenoid 12.
  • the dose control nut 15 is located at the front end of the screwing section 144 of the screw tube 14. The position and movement of the dose control nut 15 on the screw tube 14 is until the spiral end portion 152 is coupled to the spiral end portion 139 of the front end of the drive sleeve 13 at the rear thereof.
  • the operating component 20 is disposed at the rear end of the dose control assembly 10.
  • the operating component 20 includes an operating member 22, a compression spring 21, and a pressing member 23.
  • the operating member 22 includes a a card insertion portion 221 and a card end portion 222 at the rear end of the card insertion portion 221, the front end of the insertion plate portion 221 has an ejector protrusion 223, and the rear end of the ejector protrusion 223 has a bump end portion 224.
  • the operating member 22 is inserted into the second space 134 of the driving sleeve 13.
  • the pushing protrusion 223 is located between the protrusion 138 and the limiting protrusion 138a, and the protruding protrusion 223 is bent by the rear end of the protrusion 223.
  • the end portion 224 is restrained by the limiting convex portion 138a, so that when the operating member 22 is pulled backward, it is not disengaged from the driving sleeve 13, and the insertion plate end portion 222 is located outside the rear end of the driving sleeve 13, and can extend into the dose.
  • the solenoid rear end portion 123 of the solenoid 12 is controlled.
  • the compression spring 21 is sleeved on the outer side of the inserting portion 221 of the operating member 22 .
  • the two ends of the compression spring 21 respectively abut the rear end of the driving sleeve 13 and the end portion 222 of the inserting plate.
  • the pressing member 23 is sleeved on the operating member 22 .
  • the pressing member 23 and the operating member 22 are relatively rotatable and axially linearly movable, and can enter and exit the rear end portion of the dose control screw 12.
  • the operating member 22 can be pushed forward, and the protruding protrusion 223 is used to push against the protrusion 138 at the end of the locking elastic piece 137 of the driving sleeve 13, so that the locking elastic piece 137 is biased radially outward.
  • the drive sleeve 13 is coupled to the dose control solenoid 12 by being engaged in a corresponding slot 128 in the dose control solenoid 12.
  • the operating member 22 can be pulled rearwardly, and the locking tab 137 is radially inwardly reset to disengage from the corresponding slot 128 in the dose control solenoid 12.
  • the injection propulsion assembly 30 is disposed at the front end of the dose control assembly 10.
  • the injection propulsion assembly 30 includes a shaft tube 31, a push rod 32, and a push block 33.
  • the tube 31 has an axially extending shaft hole 311.
  • the shaft tube 31 includes a shaft tube body 312, a shaft tube front end portion 313 at the front end of the shaft tube body 312, and a shaft tube body 312 and a shaft tube front end portion.
  • the shaft tube body 312 of the shaft tube 31 is mounted in the screwing tube 14, and the shaft tube 31 can linearly move relative to the screwing tube 14
  • the shaft tube front end portion 313 and the annular convex portion 314 are located in front of the screwing tube 14 and the dose control solenoid 12.
  • the push rod 32 is mounted in the shaft hole 311 of the shaft tube 31.
  • the push rod 32 can linearly move axially relative to the shaft tube 31, and can rotate together with the shaft tube 31.
  • the outer peripheral wall of the push rod 32 is formed with a push.
  • the pitch is smaller than the pitch of the spiral groove 124 of the dose control solenoid 12, and the pitch of the push rod thread 321 is greater than the pitch of the thread of the screwing portion 144 of the screw tube 14.
  • the push block 33 is disposed at the front end of the push rod 32 and is located in front of the shaft tube 31.
  • the outer peripheral wall of the push rod 32 further defines at least one push rod guide groove 322 extending axially and passing through the push rod thread 321 .
  • the shaft hole 311 of the hole 31 defines at least one axially extending shaft guide rib 316.
  • the shaft guide rib 316 extends into the push rod guide 322 to enable the push rod 32 to The axial direction of the shaft tube 31 is linearly moved.
  • the outer peripheral wall of the front end portion 313 of the shaft tube 31 further defines at least one axially extending leading groove 317.
  • the outer peripheral wall of the shaft body 312 forms at least one axially extending rear guiding groove. 315, the rear guide groove 315 is engaged with the guiding rib 142 in the sleeve hole 141 of the screwing tube 14.
  • the clutching and stopping assembly 40 is disposed inside the front section of the outer tube 11 and located in front of the dose control assembly 10 and assembled with the injection propulsion assembly 30.
  • the clutching and stopping assembly 40 includes a front casing 41, a rear casing 42, a clutch member 43, and an ejector spring 44.
  • the front casing 41 is disposed outside the front portion of the push rod 32 and is fixed inside the front end of the outer tube 11 .
  • the front sleeve The outer peripheral surface of the shell 41 forms at least one axially extending assembly groove 418, or a plurality of annular flanges are formed on the outer peripheral surface of the front sleeve, so that the front sleeve 41 is installed in the outer tube inner hole 111 of the outer tube 11,
  • the coupling groove 418 is combined with the fixing rib 113, and the ring groove is combined with the ring flange to fix the front casing 41 in the outer tube 11.
  • the front casing 41 includes a sleeve portion 411 and a set of shell back plates 412 at the rear end of the sleeve portion 411.
  • the sleeve portion 411 defines an opening groove 413 with an opening facing forward.
  • the sleeve back plate 412 is formed.
  • a sleeve screw hole 415 is formed in the sleeve, and the sleeve screw hole 415 is connected to the sleeve groove 413.
  • the push rod 32 of the injection propulsion assembly 30 is screwed in the sleeve screw hole 415, and the rear end surface of the sleeve back plate 412 is
  • the casing screw hole 415 is peripherally formed with a first ratchet gear portion 416 having a plurality of annular oblique single-angled ratchet teeth.
  • the rear casing 42 is assembled at the rear end of the front casing 41 and fixed inside the front end of the outer pipe 11 .
  • the rear casing 42 is combined with the front casing 41 by a snap-fit structure of the hook 425 and the card slot.
  • the rear casing 42 can also form at least one axially extending combination groove 426 on the outer circumferential surface thereof, so that the rear casing 42 Installed in the outer tube hole 111 of the outer tube 11, and combined with the fixing rib 113 by the combination groove 426, The rear casing 42 is fixed in the outer tube 11.
  • the rear casing 42 includes a connecting portion 421 and a rear end plate 422 at the rear end of the socket portion 421.
  • the socket portion 421 defines an opening groove 423 with an opening facing forward, and a connecting hole is formed in the rear end plate 422.
  • the end plate through hole 424 of the movable groove 423, the shaft tube body 312 of the shaft tube 31 is inserted through the end plate through hole 424 of the rear end plate 422, and the shaft tube front end portion 313 of the shaft tube 31 and the annular convex portion 314 are located in the rear sleeve 42.
  • the rear end plate 422 is located between the annular convex portion 314 of the shaft tube 31 and the front end of the dose control solenoid 12.
  • the clutch member 43 is movably disposed in the movable slot 423 of the rear sleeve 42 , and a middle hole 431 is formed in the clutch member 43 and can be The axial direction of the shaft tube 31 of the shaft tube 31 is axially movably disposed.
  • the clutch member 43 defines at least one axially extending guiding flange 433 in the hole edge of the hole 431. The guide flange 433 is engaged with the front guide groove 317 of the shaft tube 31 so that the clutch member 43 can move axially forward and backward of the shaft end portion 313 of the shaft tube 31, and the clutch member 43 can rotate together with the shaft tube 31.
  • the shaft tube 31 of the injection propulsion assembly 30 is disposed in the middle hole 431 of the clutch member 43.
  • the front end of the clutch member 43 has a second ratchet gear portion 432, and the second ratchet gear portion 432 has a plurality of annular arrangements.
  • the single ratchet gear portion 432 of the clutch member 43 can be relatively engaged and disengaged from the first ratchet gear portion 416 at the rear end of the front casing 41.
  • the ejector spring 44 is disposed in the movable slot 423 of the rear sleeve 42 and sleeved on the front end portion 313 of the shaft tube 31 .
  • the front and rear ends of the ejector spring 44 respectively abut the clutch member 43 and the annular convex portion 314 of the shaft tube 31.
  • the ejector spring 44 provides an elastic force to the clutch member 43 to make the second ratchet gear of the clutch member 43.
  • the portion 432 is in opposite engagement with the first ratchet gear portion 416 at the rear end of the front casing 41.
  • the rear end of the medicine bottle 50 is assembled to the sleeve portion 411 of the front casing 41 of the clutch backstop assembly 40.
  • the pushing block 33 disposed at the front end of the push rod 32 can extend into the bottle body of the medicine bottle 50 to abut the piston 51.
  • the front end of the medicine bottle 50 is provided with a needle 60, and a needle cover 70 can be disposed outside the needle 60, or Further, a cover type cover 80 is sleeved on the outer side of the needle cover 70 and the medicine bottle 50, and the rear end of the cover 80 is sleeved outside the sleeve portion 411 of the front cover 41 to provide a safety protection function.
  • the cover 80 and the needle cover 70 are removed, and the needle 60 is inserted into a predetermined injection site of the human body to perform quantitative injection of the drug.
  • Quantitative injection in the medicament During the process, as shown in FIG. 11 to FIG. 12, the pressing member 23 of the pulling operation assembly 20 is moved backward to a certain distance beyond the rear end of the outer tube 11, and the front casing of the clutching and stopping assembly 40 is removed. 41 and the rear casing 42 are fixed in the outer tube 11, and the first ratchet gear portion 416 at the rear end of the front casing 41 and the second ratchet gear portion 432 at the front end of the clutch member 43 are engaged with each other to prevent the shaft tube 31 from rotating.
  • the restriction of the driving sleeve 13 and the screwing tube 14 by the shaft tube 31 and the driving member 13 and the screwing tube 14 can only be translated backwards, the dose control screw 12 and the driving sleeve 13 And the screwing structure between the outer tube 11 and the dose control screw 12 during the movement of the screw tube 14 in the backward movement, so that the dose control solenoid 12 is reversely reversed with respect to the outer tube 11 by a predetermined number of turns.
  • the rotation of the dose control screw 12 also drives the dose control nut 15 to move a predetermined stroke on the screwing tube 14 from the front to the back by a predetermined number of turns, and a plurality of latches 13b at the rear end of the driving sleeve 13 are driven by the screw.
  • the carding ring portion 129 of the tube rear end portion 123 bounces to make a sound.
  • the clutch member 43 When the shaft tube 31 is rotated, the clutch member 43 is also rotated with the coaxial tube 31, and the push-up spring 44 is pushed and compressed by the inclined surface between the single oblique ratchets to make the clutch member 43.
  • the second ratchet gear portion 432 can be temporarily disengaged from the first ratchet gear portion 416 at the rear end of the front casing 41, so that the clutch member 43 and the shaft.
  • the injection pen can be reused a limited number of times.
  • the needle 60 After each injection, the needle 60 must be discarded, the new needle 60 is re-replaced and then injected, and the operation assembly 20 is pulled back each time.
  • the dose control nut 15 is The front end of the drive sleeve 13 on the rear side of the screwing tube 14 is spirally moved by a certain stroke, which is determined according to the preset number of uses of the injection pen, the dose of the injected chemical solution, and the dose of the liquid medicine in the medicine bottle 50. As shown in FIG.
  • the helical limit portion 152 at the rear end of the dose control nut 15 is engaged with the screw end portion 139 of the front end of the drive sleeve 13
  • the driving sleeve 13 is passed through the shaft tube 31 as the front of the clutching and stopping assembly 40.
  • the card in which the casing 41 and the clutch member 43 are engaged with each other cannot be rotated, and the dose control screw 12 is pinned by the dose control nut 15, so that the dose control solenoid 12 can no longer be rotated backward.
  • the liquid medicine in the medicine bottle 50 is also used up, and the injection pen must be completely discarded.
  • the present invention mainly utilizes a combination structure of a dose control component, an operation component, an injection propulsion component and a clutch backstop component, so that the injection propulsion mechanism can control each injection after the medicine bottle is connected in the injection pen.
  • the injection propulsion mechanism can control each injection after the medicine bottle is connected in the injection pen.
  • the pen when the pen is repeatedly used for a certain number of times, it can provide the function of automatic locking and can no longer be used, wherein the screw limit of the rear end of the dose control nut is after the dose control nut is driven to spiral backwards a predetermined number of times.
  • the position portion is engaged with the screw end portion of the front end of the driving sleeve to be engaged with each other, and after the pressing member of the operating assembly is pressed forward to the completion of the injection, the dose control nut is integrated with the driving sleeve, and the sleeve is driven.
  • the needle tube is made of a card for engaging the clutch sleeve and the clutch member of the clutch backstop assembly, and the dose control screw is pinned by the dose control nut, so that the dose control screw can no longer be rotated backwards. This prompts the user that the pen must be discarded altogether to ensure the safety of the pen.

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Abstract

一种具有剂量控制功能的注射推进机构（1），其包含剂量控制组件（10）、操作组件（20）、注射推进组件（30）与离合逆止组件（40），该注射推进机构（1）应用于注射笔中连接药剂瓶（50），除能控制每一次的注射剂量外，并于重复使用到达一定次数后，剂量控制螺帽（15）与驱动套管（13）前后相对卡合，在操作组件（20）被按压前进至完成注射后，剂量控制螺帽（15）与驱动套管（13）结合一体，驱动套管（13）通过轴管（31）为离合逆止组件（40）的阻挡作用而无法旋转，剂量控制螺管（12）受到剂量控制螺帽（15）的牵制，造成剂量控制螺管（12）不能再被朝后旋出而锁定，药剂瓶（50）内的药液也恰好用完，由此提示注射笔必须整个抛弃，确保注射笔的使用安全性。

Description

具有剂量控制功能的注射推进机构 技术领域
本发明涉及一种注射笔，尤其涉及一种应用于该注射笔中，提供剂量控制功能，且到达使用次数后即能自动制动锁定，使注射笔无法重复使用的注射推进机构。
背景技术
基于药剂注射的安全规范，现有的注射笔已具备有限次数的重复使用的功能。现有的注射笔概区分计量型注射笔与计次型注射笔两种型式，以计量型注射笔为例，计量型注射笔是于组装药剂瓶后，利用按压注射笔后端的推杆动作，通过内部的驱动机构的连动控制来推动药剂瓶内的活塞移动一定行程距离，进而通过针头输出预出剂量的药剂。
现有计量型注射笔虽能达到定量输出药剂的功能，或进一步具备操作省力的功效，但因现有该注射笔于药剂瓶中的药剂用完后，注射笔中的驱动机构仍能操作，并未加以锁定，造成使用者可能继续误用，而有安全性不足的问题。而现今的注射笔更进一步提供自动锁定的功能，确保使用安全性。但是现有注射笔自动锁定功能仍有不足之处，有待进一步加以改善，以期对使用者提供更具实用性的注射笔。
发明内容
本发明所要解决的技术问题是：提供一种具有剂量控制功能的注射推进机构，解决现有注射笔自动锁定功能不足的问题。
本发明所提出的技术解决方案是：提供一种注射笔的注射推进机构，其特征在于，其包含一剂量控制组件、一操作组件、一注射推进组件以及一离合逆止组件，其中：
该剂量控制组件是包含：
一外管，其具有一轴向贯通的外管中孔，该外管中孔的孔壁形成一螺旋凸条；
一剂量控制螺管，其能旋转地装设于该外管的外管中孔中，该剂量控制螺管包含一具有一螺旋槽的螺接段以及位于该螺接段后端的一螺管后端部，该螺接段的螺旋槽与该外管的螺旋凸条螺合，该剂量控制螺管中形成一轴向贯通的螺管中孔，该螺管中孔孔壁后段环列有多个轴向延伸的槽沟；
一驱动套管，其装设于该剂量控制螺管的螺管中孔中，该驱动套管包含一套管前段与位于该套管前段后方的一套管后段，该套管前段中形成一开口朝前的第一空间，该套管后段中形成一开口朝后的第二空间，且该套管后段的周壁形成至少一径向连通第二空间的开槽，以及于所述开槽中形成一卡制弹片，所述卡制弹片能被推挤而卡制于该剂量控制螺管内相对应的槽沟中，该驱动套管前端形成一螺旋端部；
一螺合管，其装设于该剂量控制螺管内，该螺合管的后端固接该驱动套管的前端，该螺合管中形成一轴向贯通的套管孔，该螺合管包含一具有螺纹的螺合段以及位于该螺合段前端的一环凸缘；以及
一剂量控制螺帽，其中具有一螺孔，该剂量控制螺帽装设于该剂量控制螺管内，且螺设于该螺合管的螺合段，该剂量控制螺帽位于驱动套管前方，该剂量控制螺帽的后端形成一螺旋限位部，该螺旋限位部能与驱动套管前端的螺旋端部对应配合而限位；
该操作组件设于该剂量控制组件后端，该操作组件包含一操作件、一压缩弹簧以及一按压件，该操作件包含一插板部以及位于该插板部后端的一插板端部，该插板部是插设于该驱动套管的第二空间中，且能推挤所述卡制弹片卡制于该剂量控制螺管内相对应的槽沟中，该插板端部位于该驱动套管后端外侧，且能伸入该剂量控制螺管的螺管后端部中，该压缩弹簧是套设于该操作件的插板部外侧，该压缩弹簧两端分别抵接该驱动套管后端与该插板端部，该按压件套接枢设于该操作件后端的插板端部外侧；
该注射推进组件设于该剂量控制组件的前端，该注射推进组件包含一轴管、一推杆以及一推抵块，该轴管中具有一轴向贯通的轴孔，该轴管包含一轴管本体以及一位于该轴管本体前端的轴管前端部，该轴管的轴管本体装设于该螺合管中，该轴管能相对于该螺合管轴向直线运动，该轴管前端部位于该螺合管与该剂量控制螺管的前方，该推 杆装设于该轴管的轴孔中且能相对于该轴管轴向直线运动及与该轴管一同旋转，该推杆外周壁形成有一推杆螺纹，该推抵块组设于该推杆前端；
该离合逆止组件设于该外管前段内部，且位于该剂量控制组件前方及组接该注射推进组件，该离合逆止组件包含：
一前套壳，其固定于该外管前端内部，该前套壳后端具有一套壳背板，该套壳背板中形成一套壳螺孔，该注射推进组件的推杆螺设于该套壳螺孔中，该套壳背板后端面于套壳螺孔外围形成一第一棘齿轮部，所述第一棘齿轮部具有多个环形排列的单斜向棘齿；
一后套壳，其固定于该外管前端内部且固接于该前套壳后端；
一离合件，其能活动地组设于该后套壳内，该离合件中形成一中孔，且能轴向移动地套设于该轴管的轴管前端部上，该离合件能与该轴管一同旋转，该离合件的前端面具有一第二棘齿轮部，所述第二棘齿轮部具有多个环形排列的单斜向棘齿，该第二棘齿轮部能与该前套壳后端的第一棘齿轮部相对啮合与脱离；以及
一推顶弹簧，其设于该后套壳内，且套设于该轴管的轴管前端部上，该推顶弹簧前、后两端分别抵接该离合件与该轴管。
如上所述的注射笔的注射推进机构中，该剂量控制螺管于螺管后端部内部相对于所述槽沟后方的圆周壁形成一具有多个卡制齿的卡制齿环部，该驱动套管于套管后段的后端形成多个弹扣，该多个弹扣分别卡制于该螺管后端部的卡制齿环部。
如上所述的注射笔的注射推进机构中，该外管于该外管中孔的后段孔壁形成至少一限位斜槽；该剂量控制螺管的螺接段于衔接该螺管后端部的区段外周壁形成至少一限位斜凸块，所述限位斜凸块能与该外管的限位斜槽对位结合。
如上所述的注射笔的注射推进机构中，该剂量控制螺管的螺接段前端形成一弹性扣勾，该螺合管受到所述弹性扣勾限位。
如上所述的注射笔的注射推进机构中，该驱动套管的该套管前段的侧壁设有至少一卡接孔，该螺合管于螺合段的后端具有一组合部，该组合部具有自其后端朝前方轴向延伸的多个剖沟，且该组合部外周面形成有至少一卡接凸块，该组合部置入该驱动套管的套管前段中， 并利用所述卡接凸块与相对应的所述卡接孔凹凸配合而结合一体。
如上所述的注射笔的注射推进机构中，该驱动套管的卡制弹片末端具有凸块，且所述卡制弹片于所述凸块后方设置限位凸部，该操作件的插板部前端具有一推顶凸块，所述推顶凸块后端具有凸块端部，该推顶凸块位于所述凸块与所述限位凸部之间，该推顶凸块后端的凸块端部能受到所述限位凸部限位。
如上所述的注射笔的注射推进机构中，该螺合管的螺合段的螺距小于该剂量控制螺管的螺旋槽的螺距，该推杆螺纹的螺距小于该剂量控制螺管的螺旋槽的螺距，且该推杆螺纹的螺距大于该螺合管的螺合段的螺纹的螺距。
如上所述的注射笔的注射推进机构中，该推杆外周壁形成至少一轴向延伸且通过该推杆螺纹的推杆导槽，该轴管的轴孔孔壁形成至少一轴向延伸的轴管导引凸条，所述轴管导引凸条对应伸入所述推杆导槽中；该轴管的轴管前端部外周壁形成至少一轴向延伸的前导槽，该轴管本体外周壁形成至少一轴向延伸的后导槽，该螺合管的套管孔内的形成至少一轴向延伸的导引凸条,所述后导槽与螺合管的套管孔内的导引凸条配合；该剂量控制螺管于螺管中孔前段的孔周壁上形成多个轴向延伸凸条,该螺合管前端的环凸缘形成至少一轴向延伸的槽，所述槽与该剂量控制螺管内的凸条配合。
如上所述的注射笔的注射推进机构中，该轴管于该轴管本体与该轴管前端部之间具有一环形凸部，该环形凸部位于该螺合管与该剂量控制螺管的前方；该后套壳包含一具有一活动槽的套接部以及一位于该套接部后端的后端板，该后端板中形成一连通该活动槽的端板穿孔，该轴管的轴管本体穿设于该端板穿孔中，该轴管的轴管前端部与环形凸部位于该后套壳的活动槽中，该后端板位于该轴管的环形凸部的后方与该剂量控制螺管前端之间，该离合件与该推顶弹簧位于该活动槽中，该推顶弹簧后端抵接于该轴管的该环形凸部上。
本发明可达成的有益功效是，该注射推进机构其主要是利用剂量控制组件、操作组件、注射推进组件与离合逆止组件的组合构造，使该注射推进机构应用注射笔中连接药剂瓶后，除能控制每一次的注射剂量外，当该注射笔重复使用到达一定次数后，即能提供自动锁定无 法再使用的功能，其中，是利用剂量控制螺帽被驱动朝后螺旋预定次数后，剂量控制螺帽后端的螺旋限位部即会与驱动套管前端的螺旋端部相对卡合而结合，并在操作组件的按压件按压朝前运动至完成注射后，因剂量控制螺帽与驱动套管结合一体，驱动套管通过轴管为离合逆止组件的前套壳与离合件相互啮合的卡制作用而无法旋转，剂量控制螺管受到剂量控制螺帽的牵制，造成剂量控制螺管不能再被朝后旋出而产生自动锁定功能，此时，药剂瓶内的药液也恰好用完，因此，提示使用者该注射笔必须整个抛弃，确保注射笔的使用安全性。
附图说明
图1是本发明具有剂量控制功能的注射推进机构的一较佳实施例立体分解示意图。
图2是图1所示注射推进机构较佳实施例的另一观视角度的立体分解示意图。
图3是图1及图2所示注射推进机构较佳实施例组合后的侧视剖面示意图。
图4是图1及图2所示注射推进机构较佳实施例中的剂量控制螺管、驱动套管、螺合管以及剂量控制螺帽的放大立体分解示意图。
图5是图1及图2所示注射推进机构较佳实施例中的轴管、推杆与离合逆止组件的放大立体分解示意图。
图6是图1所示注射推进机构较佳实施例的离合逆止组件于啮合状态的局部立体示意图。
图7是图1所示注射推进机构较佳实施例的离合逆止组件于脱离状态的局部立体示意图。
图8是图1所示注射推进机构较佳实施例应用于注射笔中的侧视剖面示意图。
图9是图8所示注射笔取下护盖及针头盖的侧视剖面示意图。
图10是本发明注射推进机构较佳实施例于注射前的侧视局部剖面示意图。
图11是本发明注射推进机构较佳实施例于操作组件朝后拉伸的侧视局部剖面示意图。
图12是本发明注射推进机构较佳实施例于操作组件朝前按压的侧视局部剖面示意图。
图13是本发明注射推进机构较佳实施例到达使用次数后呈锁定状态的侧视局部剖面示意图。
附图标记说明：
1注射推进机构
10剂量控制组件
11外管                   111外管中孔
112螺旋凸条              113固定凸条
114穿孔                  115限位斜槽
12剂量控制螺管           121螺管中孔
122螺接段                123螺管后端部
124螺旋槽
126限位斜凸块            127弹性扣勾
128槽沟                  129卡制齿环部
12a凸条
13驱动套管               131套管前段
132套管后段              133第一空间
134第二空间              135隔板部
136开槽                  137卡制弹片
138凸块                  138a限位凸部
139螺旋端部
13a卡接孔                13b弹扣
14螺合管                 141套管孔
142导引凸条              143环凸缘
144螺合段                145组合部
146剖沟                  147卡接凸块
148槽                    149环槽
15剂量控制螺帽           151螺孔
152螺旋限位部            153槽
20操作组件
21压缩弹簧               22操作件
221插板部                222插板端部
223推顶凸块              224凸块端部
23按压件
30注射推进组件
31轴管                   311轴孔
312轴管本体              313轴管前端部
314环形凸部              315后导槽
316轴管导引凸条          317前导槽
32推杆                   321推杆螺纹
322推杆导槽              33推抵块
40离合逆止组件
41前套壳                 411套合部
412套壳背板              413套合槽
415套壳螺孔              416第一棘齿轮部
417卡槽                  418组接槽
42后套壳                 421套接部
422后端板                423活动槽
424端板穿孔              425卡勾
426组合槽
43离合件                 431中孔
432第二棘齿轮部          433导引凸缘
44推顶弹簧
50药剂瓶                 51活塞
60针头
70针头盖
80护盖
具体实施方式
以下配合附图及本发明的较佳实施例，进一步阐述本发明为达成预定发明目的所采取的技术手段。
如图1至图3所示，是揭示本发明具有剂量控制功能的注射推进机构的一较佳实施例，由这些附图中可以见及，该注射推进机构1是包含一剂量控制组件10、一操作组件20、一注射推进组件30以及一离合逆止组件40。
如图1至图4所示，所述剂量控制组件10包含一外管11、一剂量控制螺管12、一驱动套管13、一螺合管14以及一剂量控制螺帽15。
如图1至图4所示，该外管11中形成一轴向贯通的外管中孔111，该外管中孔111的孔壁形成一螺旋凸条112，于本较佳实施例中，该外管11于外管中孔111的前段孔壁凸伸至少一轴向延伸的固定凸条113，或进一步于外管中孔111的前段孔壁再形成多个环槽。该外管11的管壁上形成一径向贯穿至外管中孔111的穿孔114，该外管11还可于外管中孔111的后段孔壁形成至少一限位斜槽115。
如图1至图4所示，该剂量控制螺管12是能旋转地装设于该外管11中，该剂量控制螺管12中形成一轴向贯通的螺管中孔121，该剂量控制螺管12包含一螺接段122以及位于螺接段122后端的一螺管后端部123，螺接段122外周面形成一螺旋槽124，剂量控制螺管12的螺接段122螺设于外管11的外管中孔111中，且螺旋凸条112与螺旋槽124螺接配合，螺管后端部123位于外管11后端外侧。于本较佳实施例中，该螺接段122衔接螺管后端部123的区段外周壁形成至少一限位斜凸块126，所述限位斜凸块126能与外管11的限位斜槽115对位结合。该剂量控制螺管12的螺接段122前端还能形成一弹性扣勾127，该剂量控制螺管12于螺管中孔121前段的孔周壁上形成多个轴向延伸凸条12a,该剂量控制螺管12于螺管中孔121后段的孔周壁上形成多个轴向延伸的槽沟128。该螺管后端部123内相对于槽沟128后方的螺管中孔121圆周壁形成一具有多个卡制齿的卡制齿环部129。
如图1至图4所示，该驱动套管13是装设于该剂量控制螺管12的螺管中孔121中，该驱动套管13包含一套管前段131与一套管后段132，该驱动套管13的套管前段131中形成一开口朝前的第一空间133，于套管后段132中形成一开口朝后的第二空间134，于第一空间133与第二空间134之间还可形成一隔板部135，该套管后段132的周壁形成至少一径向连通第二空间134的开槽136，所述开槽136中形成一卡 制弹片137，卡制弹片137的前端为自由端，所述卡制弹片137能被推挤而径向朝外偏摆而卡制于该剂量控制螺管12内相对应的槽沟128中。所述卡制弹片137末端具有凸块138，所述卡制弹片137还于凸块138后方设置限位凸部138a，该驱动套管13于套管后段132的后端形成多个弹扣13b，该驱动套管13装设于该剂量控制螺管12中，驱动套管13后端的该多个弹扣13b是分别卡制于该螺管后端部123的卡制齿环部129。驱动套管13前端形成一螺旋端部139，于本较佳实施例中，该套管前段131的侧壁设有至少一卡接孔13a，所述第二空间134为矩形孔。
如图1至图4所示，该螺合管14是装设于剂量控制螺管12内，且螺合管14的后端连接该驱动套管13的前端，并受该剂量控制螺管12的前端的弹性扣勾127限位,该螺合管14中形成一轴向贯通的套管孔141，于套管孔141的孔壁还可形成轴向延伸的导引凸条142，该螺合管14前端形成径向凸伸的一环凸缘143，该环凸缘143外周面形成一环槽149，且该环凸缘143上形成至少一轴向延伸的槽148，所述槽148与该剂量控制螺管12内的凸条12a配合。该螺合管14包含一具有螺纹的螺合段144，该螺合段144的螺纹的螺距小于该剂量控制螺管12的螺旋槽124的螺距，螺合管14于螺合段144的后端具有一组合部145，于本较佳实施例中，该组合部145具有自其后端朝前方轴向延伸的多个剖沟146，使组合部145能径向收缩与复位，组合部145外周面形成有至少一卡接凸块147，螺合管14以组合部145置入该驱动套管13的套管前段131中，并利用卡接凸块147相对应的卡接孔13a的凹凸配合而结合一体。
如图1至图4所示，该剂量控制螺帽15中具有一螺孔151，该剂量控制螺帽15是装设于该剂量控制螺管12内，且螺设于该螺合管14的螺合段144，该剂量控制螺帽15位于驱动套管13前方。该剂量控制螺帽15的后端形成一螺旋限位部152，该螺旋限位部152能与驱动套管13前端的螺旋端部139配合，该剂量控制螺帽15外周壁还可形成至少一轴向延伸的槽153，所述槽153能与该剂量控制螺管12内的凸条12a配合，而使剂量控制螺帽15与剂量控制螺管12连动。于起始状态下，该剂量控制螺帽15是位于该螺合管14的螺合段144的前端 位置，且剂量控制螺帽15于螺合管14上的运动行程是至螺旋限位部152结合其后方的驱动套管13前端的螺旋端部139为止。
如图1至图3所示，该操作组件20是设于该剂量控制组件10后端，该操作组件20包含一操作件22、一压缩弹簧21以及一按压件23，该操作件22包含一插板部221以及位于插板部221后端的一插板端部222，该插板部221前端具有一推顶凸块223，所述推顶凸块223后端具有凸块端部224，该操作件22是插设于该驱动套管13的第二空间134中，所述推顶凸块223位于凸块138与限位凸部138a之间，推顶凸块223藉其后端的凸块端部224受到限位凸部138a的限位，使操作件22被朝后拉动时，不致与驱动套管13脱离，插板端部222位于驱动套管13后端外侧，且能伸入剂量控制螺管12的螺管后端部123中。该压缩弹簧21是套设于操作件22的插板部221外侧，压缩弹簧21两端分别抵接驱动套管13后端与插板端部222，该按压件23是套设于操作件22后端的插板端部222外侧，按压件23与操作件22之间能相对旋转及轴向直线运动，且能进出剂量控制螺管12的后端部。
前述的操作组件20中，操作件22能朝前推移，利用推顶凸块223推抵驱动套管13的卡制弹片137末端的凸块138，而使卡制弹片137径向朝外偏摆而卡制于该剂量控制螺管12内相对应的槽沟128中，使驱动套管13与剂量控制螺管12结合。所述操作件22能朝后拉动，卡制弹片137径向朝内复位而脱离该剂量控制螺管12内相对应的槽沟128。
如图1至图3所示，该注射推进组件30是设于该剂量控制组件10的前端，该注射推进组件30是包含一轴管31、一推杆32以及一推抵块33，该轴管31中具有一轴向贯通的轴孔311，该轴管31包含一轴管本体312、一位于轴管本体312前端的轴管前端部313，以及一位于轴管本体312与轴管前端部313之间且呈径向凸伸的环形凸部314，该轴管31的轴管本体312是装设于该螺合管14中，轴管31能相对于螺合管14轴向直线运动，该轴管前端部313以及环形凸部314位于螺合管14与剂量控制螺管12的前方。该推杆32是装设于该轴管31的轴孔311中，推杆32能相对于轴管31轴向直线运动，且能与轴管31一同旋转，该推杆32外周壁形成有推杆螺纹321，该推杆螺纹321的螺 距小于该剂量控制螺管12的螺旋槽124的螺距，且该推杆螺纹321的螺距大于该螺合管14的螺合段144的螺纹的螺距。该推抵块33组设于推杆32前端且位于轴管31前方。
如图1至图3及图5所示，于本较佳实施例中，该推杆32外周壁还形成至少一轴向延伸且通过该推杆螺纹321的推杆导槽322，该轴管31的轴孔311孔壁形成至少一轴向延伸的轴管导引凸条316，所述轴管导引凸条316是对应伸入所述推杆导槽322中，使推杆32能于该轴管31内部轴向直线运动，该轴管31的轴管前端部313外周壁还形成至少一轴向延伸的前导槽317，轴管本体312外周壁形成至少一轴向延伸的后导槽315，后导槽315与螺合管14的套管孔141内的导引凸条142配合。
如图1至图3及图5至图7所示，该离合逆止组件40是设于外管11前段内部且位于剂量控制组件10前方及组接该注射推进组件30，该离合逆止组件40包含一前套壳41、一后套壳42、一离合件43以及一推顶弹簧44。
如图1至图3及图5至图7所示，该前套壳41是组设于该推杆32前段外侧且固定于外管11前端内部，于本较佳实施例中，该前套壳41外周面形成至少一轴向延伸的组接槽418，或再于前套壳外周面形成多个环凸缘，使前套壳41装设于外管11的外管中孔111中，通过组接槽418与固定凸条113结合，环槽与环凸缘结合，而使前套壳41固定于外管11中。该前套壳41包含一套合部411以及位于该套合部411后端的一套壳背板412，该套合部411中形成一开口朝前的套合槽413，该套壳背板412中形成一套壳螺孔415，该套壳螺孔415连通套合槽413，该注射推进组件30的推杆32螺设于该套壳螺孔415中，该套壳背板412后端面于套壳螺孔415外围形成一第一棘齿轮部416，所述第一棘齿轮部416具有多个环形排列的单斜向棘齿。
如图1至图3及图5至图7所示，该后套壳42是组设于前套壳41后端且固定于外管11前端内部，于本较佳实施例中，后套壳42与前套壳41之间是以卡勾425与卡槽的卡接构造而组合，该后套壳42还可于其外周面形成至少一轴向延伸的组合槽426，使后套壳42装设于外管11的外管中孔111中，通过组合槽426与固定凸条113结合，使 后套壳42固定于外管11中。该后套壳42包含一套接部421以及一位于套接部421后端的后端板422，该套接部421中形成一开口朝前的活动槽423，该后端板422中形成一连通活动槽423的端板穿孔424，轴管31的轴管本体312穿设于后端板422的端板穿孔424中，轴管31的轴管前端部313与环形凸部314位于后套壳42的活动槽423中，后端板422位于轴管31的环形凸部314的后方与剂量控制螺管12前端之间。
如图1至图3及图5至图7所示，该离合件43是能活动地组设于该后套壳42的活动槽423内，该离合件43中形成一中孔431，且能轴向移动地套设于该轴管31的轴管前端部313上，于本较佳实施例中，该离合件43于其中孔431孔缘中形成至少一轴向延伸的导引凸缘433，以导引凸缘433与轴管31的前导槽317配合，使离合件43能于轴管31的轴管前端部313前后轴向移动，且离合件43能与轴管31一同旋转。该注射推进组件30的轴管31穿设于离合件43的中孔431中，该离合件43的前端面具有一第二棘齿轮部432，所述第二棘齿轮部432具有多个环形排列的单斜向棘齿，该离合件43的第二棘齿轮部432能与前套壳41后端的第一棘齿轮部416相对啮合与脱离。
如图1至图3以及图5至图7所示，该推顶弹簧44是设于该后套壳42的活动槽423内，且套设于该轴管31的轴管前端部313上，该推顶弹簧44前、后两端分别抵接该离合件43与该轴管31的环形凸部314，该推顶弹簧44是对离合件43提供弹力，使离合件43的第二棘齿轮部432与前套壳41后端的第一棘齿轮部416相对啮合。
关于本发明注射推进机构1应用于注射笔中的使用情形，如图8及图9所示，是将药剂瓶50后端组接在离合逆止组件40的前套壳41的套合部411中，设于推杆32前端的推抵块33能伸入药剂瓶50的瓶体内抵接活塞51，该药剂瓶50前端设有针头60，针头60外侧还可套设一针头盖70，或进一步以一笔盖型的护盖80套设于针头盖70与药剂瓶50外侧，护盖80后端套接前套壳41的套合部411外侧，提供安全防护作用。
如图9及图10所示，注射时，取下护盖80及针头盖70，以针头60刺入人体预定注射部位进行药剂的定量注射。在药剂定量注射的操 作过程中，如图11至图12所示，是拉动操作组件20的按压件23朝后运动至伸出外管11后端外侧一定距离后停止，其中，因离合逆止组件40的前套壳41与后套壳42被固定于外管11中，前套壳41后端的第一棘齿轮部416与离合件43前端的第二棘齿轮部432相互啮合的卡制作用而阻止轴管31旋转，并通过轴管31对驱动套管13与螺合管14的限制与操作件22连动驱动套管13以及螺合管14仅能朝后平移，该剂量控制螺管12与驱动套管13及螺合管14连动而朝后方运动过程中，通过外管11与剂量控制螺管12间的螺接构造，使剂量控制螺管12相对于外管11朝后逆向螺旋预定的圈数，剂量控制螺管12的旋转，同时也带动剂量控制螺帽15于螺合管14上由前朝后螺旋预定的圈数而移动一定行程，驱动套管13后端的多个弹扣13b于该螺管后端部123的卡制齿环部129处弹跳而发出响声。
如图11至图12所示，当使用者按压操作组件20的按压件23往前运动时，操作件22的插板部221朝前推进，并推挤驱动套管13的卡制弹片137，使卡制弹片137径向朝外偏摆卡制于该剂量控制螺管12内相对应的槽沟128中，使驱动套管13与剂量控制螺管12结合而连动，并通过外管11与剂量控制螺管12间的螺接构造，而使驱动套管13、剂量控制螺管12、螺合管14以及螺设于螺合管14上的剂量控制螺帽15于轴管31外侧一同螺旋前进；另一方面，经由螺合管14带动轴管31定点旋转，其中，前套壳41后端的第一棘齿轮部416与离合件43前端的第二棘齿轮部432之间为单斜向棘齿啮合的构造，故轴管31被带动旋转的同时，离合件43也随同轴管31旋转，通过单斜向棘齿间的斜面推挤及压缩推顶弹簧44，使离合件43的第二棘齿轮部432能暂时性与前套壳41后端的第一棘齿轮部416脱离，使离合件43与轴管31一同旋转，接续经由定点旋转轴管31带动推杆32产生旋转运动，并通过推杆32与前套壳41间的螺合构造，使旋转的推杆32前进，进而由推杆32前端的推抵块33对药剂瓶50内的活塞51施以朝前的推力，使药剂瓶50内的一定量的药液通过针头60注入人体内。
该注射笔是能有限次数地重复使用，为了确保注射的安全性，每一次注射完毕后，针头60必须抛弃，重新换装新的针头60再进行注射，且每一次朝后拉动操作组件20的过程中，剂量控制螺帽15即在 螺合管14上朝后方的驱动套管13的前端螺旋移动一定行程，所述行程是依据注射笔预设使用次数、注射药液剂量以及药剂瓶50内药液剂量而决定。如图13所示，当剂量控制螺帽15被驱动朝后螺旋预定次数之后，剂量控制螺帽15后端的螺旋限位部152即会与驱动套管13前端的螺旋端部139相对卡合而结合，并在操作组件20的按压件23按压朝前运动至完成注射之后，因剂量控制螺帽15与驱动套管13结合一体，驱动套管13通过轴管31为离合逆止组件40的前套壳41与离合件43相互啮合的卡制作用而无法旋转，剂量控制螺管12受到剂量控制螺帽15的牵制，造成剂量控制螺管12不能再被朝后旋出。此时，药剂瓶50内的药液也恰好用完，该注射笔必须整个抛弃。
经由以上说明可知，本发明主要是利用剂量控制组件、操作组件、注射推进组件与离合逆止组件的组合构造，使该注射推进机构应用注射笔中连接药剂瓶后，除能控制每一次的注射剂量外，当该注射笔重复使用到达一定次数之后，即能提供自动锁定无法再使用的功能，其中，是利用剂量控制螺帽被驱动朝后螺旋预定次数之后，剂量控制螺帽后端的螺旋限位部即会与驱动套管前端的螺旋端部相对卡合而结合，并在操作组件的按压件按压朝前运动至完成注射之后，因剂量控制螺帽与驱动套管结合一体，驱动套管通过轴管为离合逆止组件的前套壳与离合件相互啮合的卡制作用而无法旋转，剂量控制螺管受到剂量控制螺帽的牵制，造成剂量控制螺管不能再被朝后旋出，由此提示使用者该注射笔必须整个抛弃，确保注射笔的使用安全性。
以上所述仅是本发明的较佳实施例而已，并非对本发明做任何形式上的限制，虽然本发明已以较佳实施例披露如上，然而并非用以限定本发明，任何本领域的技术人员，在不脱离本发明技术方案的范围内，当可利用上述揭示的技术内容作出些许更动或修饰为等同变化的等效实施例，但凡是未脱离本发明技术方案的内容，依据本发明的技术实质对以上实施例所作的任何简单修改、等同变化与修饰，均仍属于本发明技术方案的范围内。

Claims (10)

  1. 一种注射笔的注射推进机构，其特征在于，其包含一剂量控制组件、一操作组件、一注射推进组件以及一离合逆止组件，其中：
    该剂量控制组件是包含：
    一外管，其具有一轴向贯通的外管中孔，该外管中孔的孔壁形成一螺旋凸条；
    一剂量控制螺管，其能旋转地装设于该外管的外管中孔中，该剂量控制螺管包含一具有一螺旋槽的螺接段以及位于该螺接段后端的一螺管后端部，该螺接段的螺旋槽与该外管的螺旋凸条螺合，该剂量控制螺管中形成一轴向贯通的螺管中孔，该螺管中孔孔壁后段环列有多个轴向延伸的槽沟；
    一驱动套管，其装设于该剂量控制螺管的螺管中孔中，该驱动套管包含一套管前段与位于该套管前段后方的一套管后段，该套管前段中形成一开口朝前的第一空间，该套管后段中形成一开口朝后的第二空间，且该套管后段的周壁形成至少一径向连通第二空间的开槽，以及于所述开槽中形成一卡制弹片，所述卡制弹片能被推挤而卡制于该剂量控制螺管内相对应的槽沟中，该驱动套管前端形成一螺旋端部；
    一螺合管，其装设于该剂量控制螺管内，该螺合管的后端固接该驱动套管的前端，该螺合管中形成一轴向贯通的套管孔，该螺合管包含一具有螺纹的螺合段以及位于该螺合段前端的一环凸缘；以及
    一剂量控制螺帽，其中具有一螺孔，该剂量控制螺帽装设于该剂量控制螺管内，且螺设于该螺合管的螺合段，该剂量控制螺帽位于驱动套管前方，该剂量控制螺帽的后端形成一螺旋限位部，该螺旋限位部能与驱动套管前端的螺旋端部对应配合而限位；
    该操作组件设于该剂量控制组件后端，该操作组件包含一操作件、一压缩弹簧以及一按压件，该操作件包含一插板部以及位于该插板部后端的一插板端部，该插板部是插设于该驱动套管的第二空间中，且能推挤所述卡制弹片卡制于该剂量控制螺管内相对应的槽沟中，该插板端部位于该驱动套管后端外侧，且能伸入该剂量控制螺管的螺管后端部中，该压缩弹簧是套设于该操作件的插板部外侧，该压缩弹簧两 端分别抵接该驱动套管后端与该插板端部，该按压件套接枢设于该操作件后端的插板端部外侧；
    该注射推进组件设于该剂量控制组件的前端，该注射推进组件包含一轴管、一推杆以及一推抵块，该轴管中具有一轴向贯通的轴孔，该轴管包含一轴管本体以及一位于该轴管本体前端的轴管前端部，该轴管的轴管本体装设于该螺合管中，该轴管能相对于该螺合管轴向直线运动，该轴管前端部位于该螺合管与该剂量控制螺管的前方，该推杆装设于该轴管的轴孔中且能相对于该轴管轴向直线运动及与该轴管一同旋转，该推杆外周壁形成有一推杆螺纹，该推抵块组设于该推杆前端；
    该离合逆止组件设于该外管前段内部，且位于该剂量控制组件前方及组接该注射推进组件，该离合逆止组件包含：
    一前套壳，其固定于该外管前端内部，该前套壳后端具有一套壳背板，该套壳背板中形成一套壳螺孔，该注射推进组件的推杆螺设于该套壳螺孔中，该套壳背板后端面于套壳螺孔外围形成一第一棘齿轮部，所述第一棘齿轮部具有多个环形排列的单斜向棘齿；
    一后套壳，其固定于该外管前端内部且固接于该前套壳后端；
    一离合件，其能活动地组设于该后套壳内，该离合件中形成一中孔，且能轴向移动地套设于该轴管的轴管前端部上，该离合件能与该轴管一同旋转，该离合件的前端面具有一第二棘齿轮部，所述第二棘齿轮部具有多个环形排列的单斜向棘齿，该第二棘齿轮部能与该前套壳后端的第一棘齿轮部相对啮合与脱离；以及
    一推顶弹簧，其设于该后套壳内，且套设于该轴管的轴管前端部上，该推顶弹簧前、后两端分别抵接该离合件与该轴管。
  2. 根据权利要求1所述的注射笔的注射推进机构，其特征在于，该剂量控制螺管于螺管后端部内部相对于所述槽沟后方的圆周壁形成一具有多个卡制齿的卡制齿环部，该驱动套管于套管后段的后端形成多个弹扣，该多个弹扣分别卡制于该螺管后端部的卡制齿环部。
  3. 根据权利要求2所述的注射笔的注射推进机构，其特征在于， 该外管于该外管中孔的后段孔壁形成至少一限位斜槽；该剂量控制螺管的螺接段于衔接该螺管后端部的区段外周壁形成至少一限位斜凸块，所述限位斜凸块能与该外管的限位斜槽对位结合。
  4. 根据权利要求2所述的注射笔的注射推进机构，其特征在于，该剂量控制螺管的螺接段前端形成一弹性扣勾，该螺合管受到所述弹性扣勾限位。
  5. 根据权利要求4所述的注射笔的注射推进机构，其特征在于，该驱动套管的该套管前段的侧壁设有至少一卡接孔，该螺合管于螺合段的后端具有一组合部，该组合部具有自其后端朝前方轴向延伸的多个剖沟，且该组合部外周面形成有至少一卡接凸块，该组合部置入该驱动套管的套管前段中，并利用所述卡接凸块与相对应的所述卡接孔凹凸配合而结合一体。
  6. 根据权利要求1至5中任一项所述的注射笔的注射推进机构，其特征在于，该驱动套管的卡制弹片末端具有凸块，且所述卡制弹片于所述凸块后方设置限位凸部，该操作件的插板部前端具有一推顶凸块，所述推顶凸块后端具有凸块端部，该推顶凸块位于所述凸块与所述限位凸部之间，该推顶凸块后端的凸块端部能受到所述限位凸部限位。
  7. 根据权利要求1至5中任一项所述的注射笔的注射推进机构，其特征在于，该螺合管的螺合段的螺距小于该剂量控制螺管的螺旋槽的螺距，该推杆螺纹的螺距小于该剂量控制螺管的螺旋槽的螺距，且该推杆螺纹的螺距大于该螺合管的螺合段的螺纹的螺距。
  8. 根据权利要求6所述的注射笔的注射推进机构，其特征在于，该螺合管的螺合段的螺距小于该剂量控制螺管的螺旋槽的螺距，该推杆螺纹的螺距小于该剂量控制螺管的螺旋槽的螺距，且该推杆螺纹的螺距大于该螺合管的螺合段的螺纹的螺距。
  9. 根据权利要求8所述的注射笔的注射推进机构，其特征在于，该推杆外周壁形成至少一轴向延伸且通过该推杆螺纹的推杆导槽，该轴管的轴孔孔壁形成至少一轴向延伸的轴管导引凸条，所述轴管导引凸条对应伸入所述推杆导槽中；该轴管的轴管前端部外周壁形成至少一轴向延伸的前导槽，该轴管本体外周壁形成至少一轴向延伸的后导槽，该螺合管的套管孔内的形成至少一轴向延伸的导引凸条,所述后导槽与螺合管的套管孔内的导引凸条配合；该剂量控制螺管于螺管中孔前段的孔周壁上形成多个轴向延伸凸条,该螺合管前端的环凸缘形成至少一轴向延伸的槽，所述槽与该剂量控制螺管内的凸条配合。
  10. 根据权利要求9所述的注射笔的注射推进机构，其特征在于，该轴管于该轴管本体与该轴管前端部之间具有一环形凸部，该环形凸部位于该螺合管与该剂量控制螺管的前方；该后套壳包含一具有一活动槽的套接部以及一位于该套接部后端的后端板，该后端板中形成一连通该活动槽的端板穿孔，该轴管的轴管本体穿设于该端板穿孔中，该轴管的轴管前端部与环形凸部位于该后套壳的活动槽中，该后端板位于该轴管的环形凸部的后方与该剂量控制螺管前端之间，该离合件与该推顶弹簧位于该活动槽中，该推顶弹簧后端抵接于该轴管的该环形凸部上。
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CN105288790A (zh) * 2014-06-26 2016-02-03 群康生技股份有限公司 注射器

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