Zero-pain skin piercing device

Abstract

The utility model discloses a zero pain skin puncture device, including tubular outer tube, ejection assembly and rotation gear sleeve, ejection assembly and rotation gear sleeve axial place in tubular outer tube, the pen core cover of ejection assembly is fixed with tubular outer tube, trigger pressing piece is pressed and releases cantilever, the pen core rod can be limited in tubular outer tube axial controlled ejection, the lug on the elastic sheet of rotation gear sleeve and the recess on the inner wall of tubular outer tube rotation positioning, the step limiting structure on rotation gear sleeve and the adjustment convexity on the pen core rod limit pen core rod ejection stroke. The utility model discloses simple structure, and the component is only two thirds of the existing product, and the stable performance of product is better, realizes low pain blood sampling, also is more favorable to assembly, not only reduces material cost, also reduces artificial cost.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a painless skin puncture device. Background Technology

[0002] As a blood collection device used in conjunction with disposable lancets, lancing pens are widely used for the quantitative determination of relevant components in human body fluids. For example, for specific patients, it is necessary to monitor and analyze glucose, lactate, cholesterol, bilirubin, etc. in the blood. Lancing pens have been developed for decades, and improvements have gone through many stages. Currently, lancing pens are gradually maturing. However, in the development of lancing pens, how to improve the safety, reliability, convenience, economy, and user experience of lancing pen operation has always been a concern for those skilled in the art.

[0003] Chinese patent CN 103767713 B has been granted a utility model patent with patent number 201410068802.6, entitled "Puncture Device for Reducing Pain." Chinese patent CN 110226938 B has been granted a utility model patent with patent number 201910632446.9, entitled "Blood Collection Pen for Reducing Patient Pain." These patents have made beneficial improvements in ease of use and pain reduction, achieving positive results. However, their shortcomings include a large number of parts, a complex overall structure, long assembly time, high manufacturing costs, and the need for further improvement in product stability. Utility Model Content

[0004] To address the problems existing in the prior art, this utility model provides a painless skin puncture device with a simple structure, high assembly efficiency, reduced manufacturing cost, good stability, and a good user experience.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A painless skin puncture device includes a tubular outer cylinder, an ejection assembly, and a rotating adjustment sleeve. The ejection assembly includes a pen tip rod, a firing spring, a pen tip sleeve, a spring sleeve, a return spring, and a retaining sleeve. The front end of the pen tip rod is the needle loading section, and a cantilever, a limiting spring platform, and an adjustment protrusion are sequentially arranged on the rear rod body. The firing spring and pen tip sleeve are fitted onto the front part of the pen tip rod. The firing spring is located between the limiting spring platform and the rear inner wall of the pen tip sleeve. The pen tip sleeve has a spring-loaded retaining slot and a trigger pressure plate, which is located above the cantilever. The front end of the cantilever can be locked onto the limiting rod of the spring-loaded retaining slot. A rotating adjustment sleeve, a spring sleeve, and a return spring are sequentially fitted onto the rear end of the pen tip sleeve on the pen tip rod. The retaining sleeve is secured to the tail end of the pen tip rod. The return spring is located between the front inner wall of the spring sleeve and the front wall of the retaining sleeve. The rotating adjustment sleeve has several stepped limiting structures with different heights on the top wall of its inner cavity. The adjusting protrusion on the pen refill rod is positioned behind the stepped limiting structures. A spring is provided on the side of the rotating adjustment sleeve, and a protrusion is provided at the front of the spring. This protrusion matches several axial grooves provided on the inner wall of the tubular outer cylinder. The rear end of the rotating adjustment sleeve extends out of the tubular outer cylinder to form a rotating part. The ejection assembly and the rotating adjustment sleeve are axially placed inside the tubular outer cylinder. The pen refill sleeve is locked to the tubular outer cylinder. The trigger pressure plate is pressed to release the cantilever, and the pen refill rod can be axially controlled and ejected within the tubular outer cylinder. The protrusion on the spring of the rotating adjustment sleeve rotates and is positioned by the grooves on the inner wall of the tubular outer cylinder. The stepped limiting structures on the rotating adjustment sleeve cooperate with the adjusting protrusion on the pen refill rod to limit the ejection stroke of the pen refill rod.

[0006] A further improvement involves providing a convex ring in front of the cantilever on the pen refill rod, and also providing a convex ring for the spring limiting platform. The convex ring matches the shape of the inner cavity of the pen refill sleeve to form an axial guide rail, thus restricting the axial movement of the pen refill rod. This reduces the pen refill rod's movement offset and increases its stability during ejection.

[0007] A further improvement is that the front end of the pen refill sleeve has an opening and a window, separated by a limiting rod to form a spring-loaded latch. The cantilevered front end of the pen refill rod can be displaced and stopped at the opening and the window respectively. The elastic latch is lengthened, the limiting rod is located in the middle, and the opening forms a guide area, increasing the stability of the pen refill rod's movement within the cavity.

[0008] A further improvement is that a trigger button is located inside the opening of the tubular outer cylinder at the corresponding position of the trigger pressure plate of the pen refill sleeve, and a protrusion is provided at the front end of the trigger pressure plate to abut against the bottom of the trigger button. This prevents the trigger button from uncontrollably falling into the pen barrel, keeps the button stable, and improves the experience of pressing the trigger button.

[0009] A further improvement is to provide a notch or protrusion at the rear end of the pen refill sleeve, and a corresponding protrusion or notch at the front end of the rotary adjustment sleeve, to limit the circumferential rotational travel of the rotary adjustment sleeve. This matching convex and concave structure achieves the desired circumferential rotational limiting effect.

[0010] A further improvement is that the rear end of the rotary adjustment sleeve has a circumferentially circumferentially recessed part, and a puncture scale mark is provided on the circumferential recessed part.

[0011] A further improvement is that the scale markings are either adhesive labels or printed ink layers. Adhesive label structures are easier to process, and the printed label patterns are richer and more exquisite.

[0012] A further improvement is to attach a transparent sleeve to the rotating part of the rotary gear shifter, covering the spring sleeve extending from the rear end of the rotary gear shifter. This increases the grip area and facilitates hand rotation.

[0013] A further improvement is that a transparent collar is fitted and fixed onto the rotating part of the rotary gear adjusting sleeve, and a spring extending from the rear end of the rotary gear adjusting sleeve is fitted onto and secured to the tail rod. If accidentally triggered before use, pulling the tail rod will reset it for later use.

[0014] A further improvement is that the tubular outer cylinder and the pen refill sleeve are respectively provided with axial needle retraction grooves on their sides, the needle retraction rod is inserted into the needle retraction grooves, the outer push handle is attached to the tubular outer cylinder, and the inner push rod is attached to the inner wall of the pen refill sleeve.

[0015] A further improvement is that the surface of the sleeve or collar is provided with a friction-enhancing structure. Beneficial effects

[0016] Compared with the applicant's previous products, this utility model has reduced the number of parts by one-third, has a simpler structure, better product stability, achieves painless blood collection, and is also more conducive to assembly, which not only reduces material costs but also labor costs. Attached Figure Description

[0017] Figure 1 This is an exploded structural diagram of the present invention; Figure 2 This is a cross-sectional view of the present invention; Figure 3 This is a diagram showing the fit between the tubular outer cylinder and the rotating adjustment sleeve of this utility model; Figure 4 This is a diagram showing the interaction between the pen refill sleeve and the rotating adjustment sleeve of this utility model; Figure 5 This is a perspective view of the product of this utility model; Figure 6 This is a two-dimensional view of the product of this utility model. Detailed Implementation Example 1

[0018] like Figures 1 to 5As shown, this utility model includes a tubular outer cylinder 1, an ejection assembly, and a rotating adjustment sleeve 5. The ejection assembly includes a pen refill rod 2, a firing spring 3, a pen refill sleeve 4, a spring sleeve 6, a return spring 7, and a retaining sleeve 8. The front end of the pen refill rod 2 is a needle-loading part 21, and a cantilever 23, a spring-limiting platform 24, and an adjustment protrusion 25 are sequentially provided on the rod body thereafter. The firing spring 3 and the pen refill sleeve 4 are sleeved on the front part of the pen refill rod 2. The firing spring 3 is located between the spring-limiting platform 24 and the rear inner wall of the pen refill sleeve 4. The pen refill sleeve 4 has a spring-loaded retaining slot 41 and a trigger pressure plate. 42. The front end of the pen refill sleeve 4 has an opening 411 and a window 413, which are separated by a limiting rod 412 to form a spring-loaded locking slot 41. The trigger pressure plate 42 is located above the cantilever 23, and the front end of the cantilever 23 is locked on the limiting rod 412 of the spring-loaded locking slot 41. The front end of the cantilever 23 can be moved and stopped at the opening 411 and the window 413 respectively. The rear end of the pen refill sleeve on the pen refill rod 2 is sequentially fitted with a rotating adjustment sleeve 5, a spring sleeve 6, and a return spring 7. The locking sleeve 8 is locked at the tail of the pen refill rod 2, and the return spring... Spring 7 is located between the front inner wall of spring sleeve 6 and the front wall of sleeve 8. The top wall of the inner cavity of the rotary adjustment sleeve 5 is provided with several stepped limiting structures 51 forming different height differences. The adjusting protrusion 25 on the pen refill rod 2 is positioned behind the stepped limiting structures 51. A spring piece 52 is provided on the side of the rotary adjustment sleeve 5, with a protrusion at the front of the spring piece. This protrusion matches several axial grooves 14 provided on the inner wall of the tubular outer cylinder 1. The rear end of the rotary adjustment sleeve 5 extends out of the tubular outer cylinder to form a rotary adjustment part 53. The ejection assembly and the rotary adjustment sleeve are axially positioned within the tubular outer cylinder 1. Inside, the pen refill sleeve 4 is secured to the tubular outer cylinder 1. A trigger button 11 is provided in the opening of the tubular outer cylinder 1 at the corresponding position of the trigger pressure plate 42 of the pen refill sleeve 4. When the trigger button 11 is pressed, the trigger pressure plate 42 is pressed to release the cantilever 23, and the pen refill rod 2 can be axially controlled and ejected within the tubular outer cylinder 1. The protrusion on the spring plate 52 of the rotating adjustment sleeve 5 rotates and is positioned by the groove on the inner wall of the tubular outer cylinder 1. The stepped limiting structure 51 on the rotating adjustment sleeve 5 cooperates with the adjusting protrusion 25 on the pen refill rod 2 to limit the ejection stroke of the pen refill rod.

[0019] A convex ring 22 is provided in front of the cantilever on the pen refill rod 2, and the spring limiting platform 24 is also provided as a convex ring. The convex ring 22 matches the shape of the inner cavity of the pen refill sleeve 4 to form an axial guide rail and restrict the axial movement of the pen refill rod 2.

[0020] The trigger plate 42 has a protrusion at its front end that abuts against the bottom of the trigger button 11. The protrusion supports the trigger button, preventing it from falling uncontrollably into the pen barrel.

[0021] The pen refill sleeve 4 has a notch 43 at its rear end, and the rotating adjustment sleeve 5 has a protrusion 54 at its front end to limit the circumferential rotation stroke of the rotating adjustment sleeve 5.

[0022] The rotary adjustment sleeve 5 has a circumferentially annular recessed portion at the rear end of the rotary adjustment part 53, and a puncture scale mark 55 is provided on the annular recessed portion. The scale mark 55 is an adhesive label (or an ink printing layer).

[0023] A transparent sleeve 9 is fitted and fixed on the rotating part 53 of the rotary gear adjusting sleeve 5, covering the spring sleeve extending from the rear end of the rotary gear adjusting sleeve. The surface of the sleeve is provided with a friction-enhancing structure.

[0024] The tubular outer cylinder 1 and the pen refill sleeve 4 are respectively provided with axial needle retraction grooves 13. The needle retraction rod 12 is inserted into the needle retraction groove 13. The outer push handle 121 is attached to the tubular outer cylinder 1, and the inner push rod 122 is attached to the inner wall of the pen refill sleeve 4. Example 2

[0025] like Figure 6 As shown, a transparent collar 9' is fitted and fixed on the rotating part 53 of the rotary gear adjusting sleeve 5, and the tail rod 10 is secured on the spring sleeve 6 extending from the rear end of the rotary gear adjusting sleeve. The surface of the collar is provided with a friction-enhancing structure. The rest is the same as in Embodiment 1.

[0026] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A painless skin puncture device, comprising a tubular outer cylinder (1), an ejection assembly, and a rotating adjustment sleeve (5), characterized in that: The ejection assembly includes a pen tip rod (2), a firing spring (3), a pen tip sleeve (4), a spring sleeve (6), a return spring (7), and a retaining sleeve (8). The front end of the pen tip rod (2) is a needle-loading part (21), and a cantilever (23), a spring-limiting platform (24), and an adjusting protrusion (25) are sequentially provided on the rear rod body. The firing spring (3) and the pen tip sleeve (4) are sleeved on the front part of the pen tip rod (2). The firing spring (3) is located between the spring-limiting platform (24) and the rear inner wall of the pen tip sleeve (4). The pen tip sleeve (6) 4) A spring clip (41) and a trigger plate (42) are provided on the upper part. The trigger plate (42) is located above the cantilever (23). The front end of the cantilever (23) can be locked onto the limiting rod (412) of the spring clip (41). The pen tip rod (2) is fitted with a rotating adjustment sleeve (5), a spring sleeve (6), and a return spring (7) in sequence at the rear end of the pen tip sleeve. The retaining sleeve (8) is fixed to the tail of the pen tip rod (2). The return spring (7) is located between the front inner wall of the spring sleeve (6) and the front wall of the retaining sleeve (8). The inner wall of the rotating gear sleeve (5) is provided with several stepped limiting structures (51) forming different drops. The adjusting protrusion (25) on the pen refill rod (2) is placed behind the stepped limiting structure (51). The rotating gear sleeve (5) has a spring piece (52) on its side. The front part of the spring piece has a protrusion that matches several axial grooves (14) on the inner wall of the tubular outer cylinder (1). The rear end of the rotating gear sleeve (5) extends out of the tubular outer cylinder to form a rotating part (53); the ejection assembly and the rotating gear sleeve shaft The pen tip sleeve (4) is placed inside the tubular outer cylinder (1), and the pen tip sleeve (4) is locked to the tubular outer cylinder (1). The trigger pressure plate (42) is pressed to release the cantilever (23), and the pen tip rod (2) can be restricted to axial controlled ejection inside the tubular outer cylinder (1). The protrusion on the spring plate (52) of the rotating adjustment sleeve (5) rotates and is positioned by the groove on the inner wall of the tubular outer cylinder (1). The stepped limiting structure (51) on the rotating adjustment sleeve (5) cooperates with the adjusting protrusion (25) on the pen tip rod (2) to limit the ejection stroke of the pen tip rod.

2. The painless skin puncture device according to claim 1, characterized in that: The pen refill rod (2) has a convex ring (22) in front of the cantilever, and the limiting spring platform (24) is also a convex ring. The convex ring (22) matches the shape of the inner cavity of the pen refill sleeve (4) to form an axial guide rail and restrict the axial movement of the pen refill rod (2) back and forth.

3. The painless skin puncture device according to claim 1, characterized in that: The pen refill sleeve (4) has an opening (411) and a window (413) at the front end. The opening and the window are separated by a limiting rod (412) to form a spring-loaded latch (41). The front end of the cantilever (23) of the pen refill rod (2) can be moved and stopped at the opening (411) and the window (413) respectively.

4. The painless skin puncture device according to claim 1, characterized in that: The trigger button (11) is provided in the opening of the tubular outer cylinder (1) corresponding to the trigger pressure plate (42) of the pen refill sleeve (4), and the front end of the trigger pressure plate (42) is provided with a protrusion that abuts against the bottom of the trigger button (11).

5. The painless skin puncture device according to claim 1, characterized in that: The pen refill sleeve (4) has a notch (43) or a protrusion at the rear end, and the rotating adjustment sleeve (5) has a protrusion (54) or a notch at the front end to limit the circumferential rotation stroke of the rotating adjustment sleeve (5).

6. The painless skin puncture device according to claim 1, characterized in that: The rotary adjustment sleeve (5) has an annular recessed part on its rear end (53), and a puncture scale mark (55) is provided on the annular recessed part.

7. The painless skin puncture device according to claim 1, characterized in that: The scale markings (55) are either adhesive labels or ink-printed layers.

8. The painless skin puncture device according to claim 1, characterized in that: A transparent sleeve (9) is fitted and fixed on the rotating part (53) of the rotating gear sleeve (5) to cover the spring sleeve extending from the rear end of the rotating gear sleeve.

9. The painless skin puncture device according to claim 1, characterized in that: A transparent collar (9′) is fitted and fixed on the rotating part (53) of the rotating gear sleeve (5), and the tail rod (10) is secured on the spring sleeve (6) extending from the rear end of the rotating gear sleeve.

10. The painless skin puncture device according to claim 1, characterized in that: The tubular outer cylinder (1) and the pen refill sleeve (4) are respectively provided with axial needle retraction grooves (13). The needle retraction rod (12) is inserted into the needle retraction groove (13), the outer push handle (121) is attached to the tubular outer cylinder (1), and the inner push rod (122) is attached to the inner wall of the pen refill sleeve (4).

11. The painless skin puncture device according to claim 8 or 9, characterized in that: The surface of the sleeve or collar is provided with a friction-enhancing structure.

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