Disposable pen-injector and method of operation thereof

Abstract

The application belongs to the technical field of medical devices, and particularly relates to a disposable pen-type syringe and a working method thereof. The disposable pen-type syringe comprises an upper pen barrel, a lower pen barrel connected with the upper pen barrel and used for mounting a cartridge, and a driving mechanism arranged in the upper pen barrel and comprising a lower fixing sleeve, a rectangular lead screw, a feedback connecting rod and a dose adjusting assembly. The lower fixing sleeve is connected with the upper pen barrel and is provided with a circular through hole at an axis. The rectangular lead screw is arranged on the circular through hole and is provided with two side gaps. The feedback connecting rod is sleeved on the rectangular lead screw and is provided with a pair of clamping pieces at a lower end surface for extending into the gaps. The two clamping pieces correspond to positions of two ratchet teeth, respectively extend into the corresponding gaps, and are clamped to the rectangular lead screw by the ratchet teeth to prevent shaking of the rectangular lead screw and affect the precision of the injection dose when the feedback connecting rod rotates.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, specifically relating to injection pens, and more particularly to a disposable pen-type syringe and its working method. Background Technology

[0002] Pen syringes are commonly used injection devices for insulin injection. They work by using a lead screw to move the rubber stopper inside the vial to inject insulin. The biggest difference between pen syringes and ordinary syringes is that they inject small amounts of insulin each time, which requires precise movement of the lead screw.

[0003] When adjusting the injection volume after each injection, the scaled rotary cylinder is turned to adjust the injection volume. In this regard, the relevant technology sets the lead screw to be rectangular, and its side wall has discontinuous threads to allow it to rotate during injection, while the lead screw remains stationary when adjusting the injection volume.

[0004] However, since the inner hole of the fixing component used for the limiting screw is circular, the screw of the discontinuous screw will wobble during injection, which in turn leads to the technical problem of deviation in injection measurement.

[0005] It should be noted that the information disclosed in this background section is only for understanding the background technology of the present application concept, and therefore, the above description is not considered to constitute prior art information. Summary of the Invention

[0006] This disclosure provides at least one disposable pen-type syringe and its working method.

[0007] In a first aspect, embodiments of this disclosure provide a disposable pen-type syringe, comprising: an upper pen barrel; a lower pen barrel connected to the upper pen barrel for housing a cartridge; and a drive mechanism disposed within the upper pen barrel, comprising: a lower fixing sleeve, a rectangular lead screw, a feedback link, and a dose adjustment assembly; the lower fixing sleeve is connected to the upper pen barrel and has a circular through hole at its axis; the rectangular lead screw passes through the circular through hole and has gaps on both sides; the feedback link is sleeved on the rectangular lead screw, and its lower end face is provided with a pair of clamps for extending into the gaps; the dose adjustment assembly is connected to the feedback link and is adapted to drive the feedback link to rotate so that the rectangular lead screw rotates synchronously; wherein when the feedback link rotates, the feedback link clamps the rectangular lead screw to reduce the shaking of the rectangular lead screw.

[0008] In one optional embodiment, the inner wall of the circular through hole is provided with an external thread; the side wall of the rectangular lead screw is provided with a discontinuous internal thread; wherein, the rectangular lead screw is connected to the external thread of the lower fixed sleeve through the internal thread.

[0009] In one optional embodiment, a square through hole is provided at the axis of the feedback link; the feedback link is adapted to be sleeved on the rectangular lead screw through the square through hole so as to drive the rectangular lead screw to rotate synchronously.

[0010] In one optional embodiment, a ratchet is provided around the circular through hole; a pair of ratchet teeth are provided on the lower side wall of the feedback link; wherein the ratchet teeth of the feedback link are connected to the ratchet of the lower fixed sleeve to realize unidirectional rotation of the feedback link.

[0011] In one alternative embodiment, the positions of the two clamps correspond to the positions of the two ratchet teeth; wherein, when the feedback linkage rotates, the ratchet teeth abut against the ratchet wheel and bend inward, squeezing the corresponding clamps to hold the rectangular lead screw.

[0012] In one alternative embodiment, a gap is left between the clamp and the sidewall of the rectangular lead screw to reduce the resistance when the rectangular lead screw moves relative to the feedback link.

[0013] In one optional embodiment, a linkage block is provided on the outer wall of the clamping piece; wherein, when the ratchet bends inward, the clamping piece grips the rectangular lead screw by squeezing the linkage block.

[0014] In one alternative implementation, the two clips are arranged in an "outward V" configuration.

[0015] Secondly, this disclosure also provides a method for operating a disposable pen-type syringe as described above, comprising: inserting a rectangular lead screw through a circular through hole in a lower fixed sleeve, with gaps flowing out on both sides; sleeved onto the rectangular lead screw by a feedback link; extending a clamping piece at the lower end face of the feedback link into the corresponding gap; and squeezing the clamping piece by rotating the feedback link to hold the rectangular lead screw.

[0016] In one optional embodiment, a ratchet is provided around the circular through hole; a pair of ratchet teeth are provided on the lower side wall of the feedback link; wherein, the ratchet teeth of the feedback link are connected to the ratchet of the lower fixed sleeve to realize unidirectional rotation of the feedback link; the positions of the two clamping pieces correspond to the positions of the two ratchet teeth; wherein, when the feedback link rotates, the ratchet teeth abut against the ratchet and bend inward, squeezing the corresponding clamping pieces to hold the rectangular lead screw.

[0017] The beneficial effect of this invention is that the disposable pen-type syringe and its working method are provided with a pair of clamps on the lower end face of the feedback link, so that the positions of the two clamps correspond to the positions of the two ratchet teeth and extend into the corresponding gaps respectively. Thus, when the feedback link rotates, the ratchet teeth are subjected to force and bend inward to squeeze the clamps, thereby holding the rectangular lead screw tightly to prevent it from shaking and affecting the accuracy of the injection volume.

[0018] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained through the structures particularly pointed out in the description and the drawings.

[0019] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 A cross-sectional view of a disposable pen-type syringe provided in an embodiment of this disclosure;

[0022] Figure 2 This is a cross-sectional structural schematic diagram of a drive mechanism provided in an embodiment of the present disclosure;

[0023] Figure 3 This is a schematic diagram of the structure of a lower fixing sleeve provided in an embodiment of the present disclosure;

[0024] Figure 4 This is a schematic diagram of a rectangular lead screw provided in an embodiment of the present disclosure;

[0025] Figure 5 This is a schematic diagram of a feedback linkage provided in an embodiment of the present disclosure;

[0026] Figure 6 This is a schematic diagram of the mating structure of a lower fixed sleeve, a rectangular lead screw, and a feedback link provided in an embodiment of this disclosure;

[0027] Figure 7 A schematic diagram of the mating structure of a rectangular lead screw and a lower fixed sleeve provided in an embodiment of this disclosure;

[0028] Figure 8 This is a schematic diagram of a structure provided by an embodiment of the present disclosure when the clamping plate on the feedback linkage does not grip the rectangular lead screw;

[0029] Figure 9 This is a schematic diagram of the structure of a feedback linkage clamping a rectangular lead screw, provided in an embodiment of the present disclosure.

[0030] In the picture:

[0031] 1. Place the pen holder;

[0032] 2. Pen holder;

[0033] 3. Drive mechanism; 31. Lower fixed sleeve; 311. Circular through hole; 312. External thread; 313. Ratchet; 314. Clearance; 32. Rectangular lead screw; 321. Internal thread; 33. Feedback link; 331. Square through hole; 332. Ratchet; 34. Dosage adjustment assembly;

[0034] 4. Medicine cartridge;

[0035] 5. Clamping plate; 51. Linkage block. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the figures, the thickness of parts may be exaggerated or reduced for the purpose of effectively depicting the technical content.

[0038] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0039] like Figure 1 As shown, at least one embodiment provides a disposable pen-type syringe, including: an upper pen barrel 1 and a lower pen barrel 2 connected to the upper pen barrel 1, wherein a driving mechanism 3 is provided inside the upper pen barrel 1 and a medicine cartridge 4 is provided inside the lower pen barrel 2; wherein the driving mechanism 3 achieves drug injection by squeezing the medicine cartridge 4.

[0040] like Figure 2 As shown, in some embodiments, the drive mechanism 3 includes: a lower fixed sleeve 31, a rectangular lead screw 32, a feedback link 33, and a dose adjustment assembly 34.

[0041] Specifically, such as Figure 2 , Figure 3 As shown, the lower fixed sleeve 31 is connected to the upper pen holder 1, and a circular through hole 311 is provided at its axis. An external thread 312 is provided on the inner wall of the circular through hole 311, and a ratchet 313 is provided on the periphery of the circular through hole 311.

[0042] Specifically, such as Figure 2 , Figure 4 As shown, the side wall of the rectangular lead screw 32 has a discontinuous internal thread 321; the rectangular lead screw 32 passes through the circular through hole 311 of the lower fixed sleeve 31, and is connected to the external thread 312 on the inner wall of the circular through hole 311 through the internal thread 321, that is, the rectangular lead screw 32 can be raised and lowered by rotation.

[0043] Specifically, such as Figure 2 , Figure 5 As shown, a square through hole 331 is provided at the axis of the feedback link 33, and a pair of ratchet teeth 332 are provided on the lower side wall of the feedback link 33; wherein, after the feedback link 33 is installed in the upper pen holder 1, it can only rotate, and its axial movement is limited.

[0044] Specifically, such as Figure 6 As shown, the rectangular lead screw 32 passes through the circular through hole 311 of the lower fixed sleeve 31, and the feedback link 33 is sleeved on the rectangular lead screw 32 through the square through hole 331. The ratchet 332 of the feedback link 33 is connected to the ratchet 313 on the lower fixed sleeve 31. That is, when the feedback link 33 rotates counterclockwise, it will drive the rectangular lead screw 32 to rotate synchronously, so that the rectangular lead screw 32 extends downward.

[0045] Specifically, the structure of the dose adjustment component 34 is existing technology, and this application will not improve it. It is only necessary to realize that the feedback linkage 33 rotates counterclockwise during injection.

[0046] like Figure 7 As shown, due to the use of a rectangular lead screw 32, when the rectangular lead screw 32 passes through the circular through hole 311 of the lower fixed sleeve 31, gaps 314 will flow out on both sides. These gaps 314 cause the rectangular lead screw 32 to wobble when rotating and squeezing the cartridge 4, which in turn leads to deviations in the injection metering.

[0047] To solve the above problems, such as Figure 5 As shown, in this embodiment, a pair of clips 5 are provided on the lower end face of the feedback link 33. The positions of the two clips 5 correspond to the positions of the two ratchet teeth 332, and the two clips 5 extend into the corresponding gaps 314 respectively.

[0048] Specifically, such as Figure 8 As shown, there is a gap between the clamp 5 and the side wall of the rectangular lead screw 32, thereby reducing the resistance when the rectangular lead screw 32 moves relative to the feedback link 33.

[0049] In this embodiment, when the feedback link 33 is subjected to a counterclockwise rotational force, the ratchet 332 on it abuts against the ratchet 313 and bends inward, thereby allowing the feedback link 33 to rotate; at the same time, when the ratchet 332 bends inward, the ratchet 332 will squeeze the corresponding clamp 5, so that the two clamps 5 hold the rectangular lead screw 32 tightly, thereby reducing the shaking of the rectangular lead screw 32 during rotation.

[0050] like Figure 8 As shown, in some embodiments, the outer wall of the clip 5 is provided with a linkage block 51.

[0051] In this embodiment, when the ratchet 332 bends inward, the ratchet 332 presses against the linkage block 51 to make the clamp 5 hold the rectangular lead screw 32 tightly.

[0052] like Figure 8 , Figure 9 As shown, in some embodiments, the two clamping pieces 5 are arranged in an "outward V" shape; when the clamping pieces 5 are subjected to force to hold the rectangular lead rod 32, more of the lower part of the clamping pieces 5 is in contact with the rectangular lead rod 32, thereby increasing stability.

[0053] At least one embodiment also provides a method of operating a disposable pen-type syringe, comprising: passing a rectangular lead screw 32 through a circular through hole 311 in a lower fixed sleeve 31, with gaps 314 flowing out on both sides; mounting a feedback link 33 on the rectangular lead screw 32; inserting a clamping piece 5 on the lower end face of the feedback link 33 into the corresponding gap 314; and squeezing the clamping piece 5 by rotating the feedback link 33 to hold the rectangular lead screw 32.

[0054] In some embodiments, a ratchet 313 is provided around the circular through hole 311; a pair of ratchet teeth 332 are provided on the lower side wall of the feedback link 33; wherein, the ratchet teeth 332 of the feedback link 33 are connected to the ratchet 313 of the lower fixed sleeve 31 to realize the unidirectional rotation of the feedback link 33; the positions of the two clamping pieces 5 correspond to the positions of the two ratchet teeth 332; wherein, when the feedback link 33 rotates, the ratchet teeth 332 abut against the ratchet 313 and bend inward, thereby squeezing the corresponding clamping pieces 5 to hold the rectangular lead screw 32.

[0055] For the specific structure and implementation process of the disposable pen syringe, please refer to the relevant discussion in the above embodiments, which will not be repeated here.

[0056] In summary, this disposable pen-type syringe and its working method have a pair of clamping pieces 5 on the lower end face of the feedback link 33, so that the two clamping pieces 5 correspond to the positions of the two ratchet teeth 332 and extend into the corresponding gaps 314 respectively. When the feedback link 33 rotates, the ratchet teeth 332 are forced to bend inward to squeeze the clamping pieces 5, thereby holding the rectangular lead screw 32 tightly to prevent it from shaking and affecting the accuracy of the injection volume.

[0057] In this document, when it is said that the first component is located on the second component, this can mean that the first component can be directly formed on the second component, or that the third component can be inserted between the first component and the second component.

[0058] In this document, when an element or layer is referred to as “located,” “joined to,” “connected to,” “attached to,” or “coupled to” another element or layer, it may be directly located, joined, connected, attached to, or coupled to the other element or layer, or there may be intermediate elements or layers present. Conversely, when an element is referred to as “directly on another element or layer,” “directly joined to,” “directly connected to,” “directly attached to,” or “directly coupled to” another element or layer, there may be no intermediate elements or layers present. Other terms used to describe relationships between elements should be interpreted in a similar manner (e.g., “between” versus “directly between,” “adjacent” versus “directly adjacent,” etc.). As used herein, the term “and / or” includes any and all combinations of one or more of the related listed items.

[0059] In this document, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as “at least one of…” modify the entire list of elements when following a list of elements, rather than individual elements in the list. For example, the expression “at least one of a, b, and c” should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0060] The terminology used herein is for the purpose of describing specific exemplary configurations only and is not intended to be limiting. As used herein, the singular articles “a,” “an,” and “the” may also be intended to include plural forms unless otherwise clearly stated herein. The terms “comprising,” “including,” and “having” are inclusive and thus specify the presence of features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein should not be construed as requiring them to be performed in the specific order discussed or shown, unless specifically identified as such. Additional or alternative steps may be employed.

[0061] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.

[0062] In the description of the embodiments of the present invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0063] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence unless expressly indicated herein. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed above may be referred to as a second element, component, region, layer, or segment.

[0064] Spatially relative terms, such as “inside,” “outside,” “below,” “below,” “down,” “above,” “up,” etc., may be used herein to describe the relationship between one element or feature illustrated in the figures and another element or feature. In addition to the orientations depicted in the figures, spatially relative terms may be intended to cover different orientations of the device in use or operation. For example, if the device in the figure is flipped, an element described as “below” or “below” other elements or features would be oriented as “above” other elements or features. Thus, the example term “below” can cover both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein are interpreted accordingly.

[0065] In the above discussion, unless otherwise stated, when used to describe numerical values, the terms “about,” “approximately,” “basically,” etc., indicate a change of + / - 10% in that value.

[0066] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A disposable pen-type injector, characterized in that, Include: The upper pen barrel (1); Lower pen barrel (2), with the upper pen barrel (1) is connected, which is used for installing the cartridge (4) inside; Drive mechanism (3), provided in the upper pen barrel (1), it includes: lower fixed sleeve (31), rectangular lead screw (32), feedback connecting rod (33) and adjusting dose assembly (34); The lower fixed sleeve (31) is connected with the upper pen barrel (1), and a circular through hole (311) is formed at the shaft center; The rectangular lead screw (32) is arranged in the circular through hole (311), and the gap (314) is arranged at both sides; The feedback connecting rod (33) is arranged on the rectangular lead screw (32), and a pair of clamping pieces (5) for extending into the gap (314) is arranged on the lower end surface of the feedback connecting rod (33); The adjusting dose assembly (34) is connected with the feedback connecting rod (33), and is suitable for rotating the feedback connecting rod (33) to make the rectangular lead screw (32) rotate synchronously; wherein When the feedback connecting rod (33) rotates, the feedback connecting rod (33) is clamped by extruding the clamping piece (5) rectangular lead screw (32) to reduce the shaking of the rectangular lead screw (32); The periphery of the circular through hole (311) is provided with a ratchet (313); The lower part of the side wall of the feedback connecting rod (33) is provided with a pair of ratchet teeth (332); Wherein, the ratchet teeth (332) of the feedback connecting rod (33) and the ratchet (313) of the lower fixed sleeve (31) are connected to realize the one-way rotation of the feedback connecting rod (33); The positions of the two clamping pieces (5) correspond to the positions of the two ratchet teeth (332); Wherein, when the feedback connecting rod (33) rotates, the ratchet teeth (332) are bent inward after abutting against the ratchet (313), and the rectangular lead screw (32) is clamped by extruding the corresponding clamping piece (5).

2. The disposable pen injector of claim 1, wherein: The inner wall of the circular through hole (311) is provided with external threads (312); The side wall of the rectangular lead screw (32) is provided with discontinuous internal threads (321); Wherein, the rectangular lead screw (32) is connected with the external threads (312) of the lower fixed sleeve (31) through the internal threads (321).

3. The disposable pen injector of claim 2, wherein: The shaft center of the feedback connecting rod (33) is provided with a square through hole (331); The feedback connecting rod (33) is suitable for being arranged on the rectangular lead screw (32) through the square through hole (331) to drive the rectangular lead screw (32) to rotate synchronously.

4. The disposable pen injector of claim 3, wherein: The clamping piece (5) and the side wall of the rectangular lead screw (32) are spaced apart to reduce the resistance when the rectangular lead screw (32) moves relative to the feedback connecting rod (33).

5. The disposable pen injector of claim 4, wherein: The outer side wall of the clamping piece (5) is provided with a linkage block (51); Wherein, when the ratchet teeth (332) are bent inward, the clamping piece (5) is clamped by extruding the linkage block (51) rectangular lead screw (32).

6. The disposable pen injector of claim 5, wherein: The two clamping pieces (5) are arranged in "outer eight characters".

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