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EP-4736910-A1 - NOVEL LUBAN LOCK STRUCTURE AND APPLICATION METHOD THEREFOR IN SYRINGE

EP4736910A1EP 4736910 A1EP4736910 A1EP 4736910A1EP-4736910-A1

Abstract

The present invention discloses a novel Luban lock structure, including: a booster rod, a power source, a fixing block, a guide pin, a sound-emitting block, and a slider. The slider is slidably coupled to an outer side of the sound-emitting block. The booster rod is engaged with an inner side of the sound-emitting block via a first boss. The slider is provided with a stop plate configured to limit a position of the first boss. The fixing block is snap-fitted between a top end of the sound-emitting block and a top end of the slider. The guide pin is connected to an inner bottom end of the sound-emitting block. The power source is sleeved over the guide pin, with two ends of the power source respectively connected to an end of the guide pin and an end of a cavity of the booster rod. When the Luban lock structure of the present invention is applied to an autoinjector, the booster rod is prevented from moving forward when the first boss of the booster rod is engaged with a guiding inclined surface of the sound-emitting block while the stop plate of the slider extends into a channel of the sound-emitting block, thereby preventing accidental triggering of a power unit of the autoinjector. The booster rod is free of grooves, which increases structural strength, reduces fracture risks during prolonged storage, extends the service life of the autoinjector, lowers manufacturing precision requirements, and reduces production costs.

Inventors

  • LIU, KAI

Assignees

  • Eases Medical Technology (Suzhou) Co., Ltd

Dates

Publication Date
20260506
Application Date
20231227

Claims (10)

  1. A novel Luban lock structure, comprising: a booster rod (100), a power source (200), a fixing block (300), a guide pin (400), a sound-emitting block (500), and a slider (600), wherein the slider (600) is slidably coupled to an outer side of the sound-emitting block (500); the booster rod (100) is engaged with an inner side of the sound-emitting block (500) via a first boss (1); the slider (600) is provided with a stop plate (13) configured to limit a position of the first boss (1); the fixing block (300) is snap-fitted between a top end of the sound-emitting block (500) and a top end of the slider (600); the guide pin (400) is connected to an inner bottom end of the sound-emitting block (500); the power source (200) is sleeved over the guide pin (400); and two ends of the power source (200) are respectively connected to an end of the guide pin (400) and an end of a cavity of the booster rod (100).
  2. The novel Luban lock structure according to claim 1, wherein the sound-emitting block (500) is configured as a hollow structure with an open top end, comprising: limiting slots (16), wherein two limiting slots (16) are symmetrically formed at a lower part of the sound-emitting block (500) and extend through a side wall thereof; channels (11), wherein two channels (11) are symmetrically connected to an outer side of the sound-emitting block (500) and extend along a length direction of the sound-emitting block (500); the channels (11) are in communication with the limiting slots (16), and a width of the limiting slots (16) is greater than a width of the channels (11); a guiding inclined surface (7) is formed on a lower end surface where each channel (11) is connected to the corresponding limiting slot (16); and a height of the guiding inclined surface (7) gradually increases from an inner side to an outer side of the channel (11); second cantilevers (8), wherein two second cantilevers (8) are symmetrically connected to an upper part of the sound-emitting block (500); the second cantilevers (8) and the channels (11) are arranged in a staggered manner, with a gap provided between them; and hooks (10), wherein each hook (10) is connected to a top end of the second cantilever (8) and folded outward; and a bottom surface of each hook (10) is provided with a hook inclined surface (9).
  3. The novel Luban lock structure according to claim 2, wherein the booster rod (100) is configured as a hollow structure with an open bottom end, comprising: first bosses (1), wherein two first bosses (1) are symmetrically provided at both sides of a bottom end of the booster rod (100); an upper surface of each first boss (1) is provided with an upper inclined surface (2) configured to be engaged with the guiding inclined surface (7) of the sound-emitting block (500); and a lower surface of each first boss (1) is provided with a lower inclined surface (3); and positioning flats (4), wherein two positioning flats (4) are symmetrically connected to a top end of the booster rod (100).
  4. The novel Luban lock structure according to claim 1, wherein the power source (200) is configured as an elastic reset element.
  5. The novel Luban lock structure according to claim 3, wherein the fixing block (300) comprises: a first through hole (17) extending through a center of the fixing block (300); second bosses (14), wherein two second bosses (14) are symmetrically connected to both sides of the fixing block (300); first cantilevers (5), wherein each first cantilever (5) is connected to a top end of the second boss (14); and a top end of each first cantilever (5) is bent inward; first side recesses (18), wherein two first side recesses (18) are symmetrically disposed in the first through hole (17) and correspond to positions of the first cantilevers (5); and a recess inclined surface (6) is provided on a top surface of each first side recess (18), which is configured to be in contact with the hook inclined surface (9); and second side recesses (19), wherein two second side recesses (19) are symmetrically disposed in the first through hole (17) and arranged in a staggered manner with the first side recesses (18); and a distance from each second side recess (19) to the center of the fixing block (300) is less than a distance from an outer side surface of the channel (11) to a center of the sound-emitting block (500).
  6. The novel Luban lock structure according to claim 5, wherein the slider (600) is configured as a hollow structure with two open ends, and the slider (600) comprises: a fixing seat (20), wherein the fixing seat (20) is connected to a top end of the slider (600) and having a second through hole (21) formed through a center of the fixing seat (20); the fixing block (300) is mounted within the fixing seat (20); receiving slots (22) are symmetrically formed on both sides of the fixing seat (20); and the second boss (14) is mounted therein; third side recesses (23), wherein two third side recesses (23) are symmetrically formed on both sides of the second through hole (21); the third side recesses (23) are arranged in a staggered manner with the receiving slots (22); and a distance from each third side recess (23) to a center of the slider (600) is greater than the distance from the outer side surface of the channel (11) to the center of the sound-emitting block (500); and limiting holes (12), wherein two limiting holes (12) are symmetrically formed in a side wall of the slider (600); and positions of the limiting holes (12) correspond to those of the receiving slots (22).
  7. The novel Luban lock structure according to claim 6, wherein the slider (600) further comprises: elongated slots (24), wherein two elongated slots (24) are symmetrically formed in both sides of the slider (600) and extend along a length direction of the slider (600); the elongated slots (24) are arranged in a staggered manner with the limiting holes (12) and communicate with the third side recesses (23); and the channel (11) is slidable into the corresponding elongated slot (24) along the third side recesses (23); and stop plates (13), wherein each stop plate (13) is connected to a bottom end of the elongated slot (24) and extends along the length direction of the slider (600); and the stop plate (13) is mounted in the channel (11); and support arms (15), wherein two support arms (15) are symmetrically connected to an outer wall of the slider (600); and the support arms (15) are disposed below the limiting holes (12).
  8. The novel Luban lock structure according to claim 1, wherein its specific assembly process comprises the following steps: step S100, inserting the sound-emitting block (500) into the slider (600); step S200, fitting the fixing block (300) over the sound-emitting block (500); step S300, inserting the guide pin (400) into the sound-emitting block (500); step S400, fitting the power source (200) over the guide pin (400) via a center thereof; step S500, fitting the booster rod (100) over the power source (200); step S600, pressing the booster rod (100) to pass through the sound-emitting block (500), then rotating the booster rod (100) to engage the first bosses (1) of the booster rod (100) with the guiding inclined surfaces (7) of the sound-emitting block (500); and step S700, pushing the slider (600) upward to insert the two stop plates (13) of the slider (600) into the corresponding channels (11) of the sound-emitting block (500), thereby completing the assembly.
  9. A method for applying a novel Luban lock structure to an autoinjector, employing the novel Luban lock structure according to claim 7, wherein the novel Luban lock structure is installed within the autoinjector to form a drug delivery booster device module, and the drug delivery booster device module comprises: a first housing (101), wherein the first housing (101) is sleeved over an outer side of the novel Luban lock structure and having one end provided with an opening; the booster rod (100) extends out of the first housing (101); a side wall of the first housing (101) is symmetrically provided with snap slots (102); an edge of the second boss (14) of the fixing block (300) is snap-fitted within the snap slot (102); and an end of the sound-emitting block (500) is spaced apart from an end of an inner wall of the first housing (101); and a support power source (103), wherein the support power source (103) is sleeved over an outer side of the slider (600); and two ends of the support power source (103) are respectively connected to the end of the inner wall of the first housing (101) and the support arm (15).
  10. The method for applying a novel Luban lock structure to an autoinjector according to claim 9, wherein the autoinjector further comprises a drug delivery protection device module, and the drug delivery protection device module comprises: a second housing (104) having one end connected to an open end of the first housing (101), and the other end provided with an opening; a drug chamber (105), wherein the drug chamber (105) is installed at a center of the second housing (104); a drug liquid is accommodated within the drug chamber (105) and is blocked by a rubber plug (106); the first cantilever (5) is snap-fitted with one end of the drug chamber (105); the booster rod (100) extends into the drug chamber (105) and is adjacent to the rubber plug (106); and the other end of the drug chamber (105) is connected to a needle (107); a protective cover (108) detachably connected to an open end of the second housing (104) and fitted over an outer side of the needle (107); and a telescopic shroud (109), wherein the telescopic shroud (109) is telescopically connected to the open end of the second housing (104); and the telescopic shroud (109) is connected to the slider (600) via a structural member.

Description

TECHNICAL FIELD The present invention relates to the technical field of medical devices, and more specifically, the present invention relates to a novel Luban lock structure and a method for applying the same to an autoinjector. BACKGROUND TECHNOLOGY A disposable injection pen is a pen-type injector pre-filled with medicament, also known as a pre-filled injection pen. Currently, the working principles of the power mechanism of injection pens on the market are all the same, that is, after a spring (power source) is pre-compressed, the spring is released during use, and then a plunger rod is driven forward to perform injection. Currently, the injection pens on the market all adopt a clamping-type structure. FIG. 1 provides a structural view of a power mechanism of an injection pen currently used on the market, with its working principle as follows: a spring is installed into a plunger rod for pre-compression, and then clamped in an annular groove of the plunger rod by a clamping component, and then a release unit is installed so that the clamping component cannot deform, thereby ensuring that the plunger rod remains fixed and stationary in a state where the spring is compressed. During release, the release unit is pressed downward; when the release unit moves past the clamping component, under the action of the spring, two hooks of the clamping component deform outward, and the plunger rod is then pushed forward to realize the function of injection. This form has the following problems: (1) due to space limitations, the depth of the annular groove on the plunger rod is only 0.5 mm, and the space for the clamping component is relatively small, which requires high dimensional precision of the product, thereby increasing the difficulty of manufacturing and also increasing the cost of parts; (2) due to the high precision requirements and limited space for the clamping component, accidental triggering may occur during actual use; (3) since the annular groove is cut on the plunger rod, the plunger rod may break during long-term storage. Therefore, it is necessary to propose a novel Luban lock structure and a method for applying the same to an autoinjector, so as to at least partially address the problems existing in the prior art. CONTENT OF THE INVENTION In the "Summary" section of the present invention, a series of simplified concepts are introduced, which will be further described in the "Detailed Description of The Embodiments" section. The "Summary" section of the present invention is not intended to limit the key and necessary technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution. To at least partially solve the above problems, the present invention provides a novel Luban lock structure, including: a booster rod, a power source, a fixing block, a guide pin, a sound-emitting block and a slider, wherein the slider is slidably coupled to an outer side of the sound-emitting block; the booster rod is engaged with an inner side of the sound-emitting block via a first boss; the slider is provided with a stop plate configured to limit a position of the first boss; the fixing block is snap-fitted between a top end of the sound-emitting block and a top end of the slider; the guide pin is connected to an inner bottom end of the sound-emitting block; the power source is sleeved over the guide pin; and two ends of the power source are respectively connected to an end of the guide pin and an end of a cavity of the booster rod. Preferably, the sound-emitting block is configured as a hollow structure with an open top end, including: limiting slots, wherein two limiting slots are symmetrically formed at a lower part of the sound-emitting block and extend through a side wall thereof;channels, wherein two channels are symmetrically connected to an outer side of the sound-emitting block and extend along a length direction of the sound-emitting block; the channels are in communication with the limiting slots, and a width of the limiting slots is greater than a width of the channels; a guiding inclined surface is formed on a lower end surface where each channel is connected to the corresponding limiting slot; and a height of the guiding inclined surface gradually increases from an inner side to an outer side of the channel;second cantilevers, wherein two second cantilevers are symmetrically connected to an upper part of the sound-emitting block; the second cantilevers and the channels are arranged in a staggered manner, with a gap provided between them; andhooks, wherein each hook is connected to a top end of the second cantilever and folded outward; and a bottom surface of each hook is provided with a hook inclined surface. Preferably, the booster rod is configured as a hollow structure with an open bottom end, including: first bosses, wherein two first bosses are symmetrically provided at both sides of a bottom end of the booster rod; an up