Blood sampling trigger feedback mechanism

Abstract

The utility model discloses a blood sampling trigger feedback mechanism mainly relates to medical blood sampling instrument field. Including cylinder seat, the upper end of cylinder seat is equipped with the cylinder mouth, is equipped with the inner tube of the length direction sliding cooperation and the circumferential stop in cylinder seat, the bottom of inner tube is equipped with the seat body with its sliding cooperation and the circumferential rotation, the upper elastic member and lower elastic member are equipped respectively on seat body upside down, the inner wall of cylinder seat is equipped with the symmetrical setting of variable track groove, and the variable track groove includes the parallel and equal width setting of catch groove and firing groove, and the bottom of catch groove and firing groove is equipped with the connecting channel of the both intercommunication, and the lateral wall of seat body is equipped with the sliding block of the outward bulge symmetrically, and the sliding groove is connected with catch groove or with firing groove slidingly respectively.

Description

Technical Field

[0001] This utility model relates to the field of medical blood collection devices, specifically a blood collection trigger feedback mechanism. Background Technology

[0002] The press-triggered lancet is a stand-alone lancet characterized by its simplicity, ease of use, and high safety. It is primarily used for small-volume blood sampling from fingertips and other extremities, commonly employed in blood glucose testing and routine blood tests. This type of lancet enjoys high market acceptance due to its ability to reduce pain for the operator and improve sampling efficiency, making it widely used in medical facilities and for home testing.

[0003] The core component of existing trigger-type blood collection needles, besides the needle tip, lies in their triggering mechanism. Existing triggering mechanisms have the following problems: The triggering mechanism is relatively complex, typically consisting of multiple components that need to work together to achieve the ejection and reset functions of the blood collection needle. The ejection structure requires the design of multiple protection mechanisms, such as springs, protective caps, and reset mechanisms. Moreover, these components are non-standard and require separate outsourcing for processing and assembly, resulting in higher production costs, difficulties in managing product quality control, and complex product assembly.

[0004] Existing triggering mechanisms typically use a direct pressing method, which introduces a certain risk of accidental triggering, including the risk of needle tip exposure and puncture wounds. Therefore, they pose a significant safety hazard in use. Utility Model Content

[0005] The purpose of this invention is to provide a blood collection trigger feedback mechanism, which is an internal pressure trigger and achieves automatic needle dispensing through a simple track-changing structure.

[0006] To achieve the above objectives, this utility model employs the following technical solution: A blood collection trigger feedback mechanism includes a cylindrical base with an opening at its upper end. An inner cylinder, which slides along the length of the base and is circumferentially stopped, is located inside the base. An annular member, coaxial with the opening, is located at one end of the inner cylinder near the opening. The inner diameter of the annular member is smaller than that of the opening. A seat, which slides along the bottom of the inner cylinder and is circumferentially rotatable, is located at the bottom of the inner cylinder. A lower elastic member is located between the seat and the bottom of the cylindrical base, and an upper elastic member is located between the seat and the upper end of the cylindrical base. An upwardly extending needle is fixed to the seat. Symmetrically arranged guide grooves are provided on the inner wall of the cylindrical base. Each guide groove includes a locking groove and a firing groove arranged side-by-side and of equal width. The firing groove extends along the cylinder... The seat extends along its length, with the top of the firing groove close to the cylinder opening. The top of the locking groove does not exceed 1 / 3 of the height of the firing groove. The bottom of the locking groove and the firing groove are provided with a connecting channel connecting the two. The inner cylinder has symmetrically arranged through-hole strips on its side wall, which correspond to the firing groove. The bottom of the strips penetrates the bottom side of the inner cylinder. The bottom of one side wall of the strip has an inclined pressing side, which overlaps with the position of the locking groove. The side wall of the seat has symmetrically arranged outwardly protruding sliders. The top of the slider has a force-bearing surface parallel to the pressing side. The sliders are respectively engaged with the locking groove or slidably connected to the firing groove.

[0007] The upper part of the cylinder seat near the cylinder opening is cylindrical and has an annular end face at the cylinder opening. The bottom of the cylinder seat away from the cylinder opening is square and has a square end face at the bottom. The shape of the cylinder seat is a layout transition from the annular end face to the square end face.

[0008] A concave surface with a spherical crown-shaped curved surface is provided in the center of the square end face.

[0009] The cylinder base includes a base body and a cylinder body, with the base body located at the bottom of the cylinder body and the two being fixedly engaged.

[0010] The cylinder base is a shell structure with an internal cavity communicating with the cylinder opening. The two-thirds portion of the cylinder cavity near the cylinder opening is a cylindrical sliding cavity. The inner cylinder is cylindrical and adapted to the inner diameter of the sliding cavity. Two sliding grooves are symmetrically provided on the inner wall of the sliding cavity. The outer wall of the inner cylinder is provided with an outwardly protruding sliding strip. The sliding strip is located in the sliding groove and slides in cooperation with the sliding groove.

[0011] The upper and lower ends of the base have circular end faces respectively. The needle body is perpendicular to the upper end face. The top of the needle body away from the upper end face is provided with a needle tip. The upper elastic element and the lower elastic element are both helical springs. The bottom end of the upper elastic element is in contact with the upper end face of the base. The top end of the upper elastic element is sleeved on the annular part. The top end of the lower elastic element is in contact with the lower end face of the base. The bottom end of the lower elastic element is located at the bottom of the cylinder base.

[0012] The seat body is provided with 2-4 raised ribs on its periphery, and the outer surface of the raised ribs slides in contact with the inner cylinder.

[0013] A stop is provided at one end of the firing groove near the barrel opening.

[0014] The top side of the connecting channel has an inclined slope, and the two ends of the inclined slope are respectively connected to the slot and the firing slot. That is, the bottom end of the inclined slope is connected to the middle or upper part of the slot wall, and the top end of the inclined slope is connected to the firing slot wall.

[0015] The bottom end of one sidewall of the strip-shaped opening forms a triangular notch structure based on the compression side.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: The inner cylinder is located inside the opening and is only partially exposed. It requires insertion and pressing to change the trajectory for firing, making it less prone to accidental triggering and improving safety. The components are simple, consisting of several independent small components that, when assembled, achieve the pop-out process based on trajectory change. The structure is reasonable and the design is simple, reducing the difficulty and cost of processing. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall design of this utility model.

[0018] Figure 2 This is a schematic diagram of the internal structure of this utility model.

[0019] Figure 3 This is a schematic diagram of the internal components of the cylinder base of this utility model.

[0020] Figure 4 This is a schematic diagram of the internal structure of the cylindrical base of this utility model.

[0021] Figure 5 This is a schematic diagram of the internal structure of the cylindrical base of this utility model.

[0022] Figure 6 This is a schematic diagram of the cylindrical base of this utility model from a bottom view.

[0023] Figure 7 This is a schematic diagram of the inner cylinder and needle assembly of this utility model.

[0024] The labels shown in the attached diagram: 1. Cylinder base; 2. Inner cylinder; 4. Upper elastic element; 5. Lower elastic element; 6. Cylinder opening; 7. Annular end face; 8. Square end face; 9. Concave surface; 10. Cylinder cavity; 11. Lower spring seat; 12. Slide groove; 13. Slot; 14. Firing groove; 15. Connecting channel; 16. Stop block; 17. Annular element; 18. Slide bar; 19. Strip-shaped opening; 20. Pressure side; 21. Seat body; 22. Needle body; 23. Rib; 24. Slider; 25. Force-bearing surface. Detailed Implementation

[0025] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the present invention, and these equivalent forms also fall within the scope defined in this application. Example

[0026] This mechanism consists only of the passively triggered components, including a base 1, an inner cylinder 2, a needle assembly, an upper elastic element 4, and a lower elastic element 5. Its components are simplified and easy to assemble.

[0027] The upper elastic element 4 and the lower elastic element 5 are both helical springs.

[0028] To facilitate the assembly of internal components, the cylinder base 1 includes a base body 21 and a cylinder body. The base body 21 is located at the bottom of the cylinder body and is fixed by engaging with the cylinder body through a snap-fit ​​mechanism. Once the internal components are assembled, closing the base body 21 will result in a closed and complete cylinder base 1.

[0029] The cylindrical base 1 is the outermost component, used to accommodate and install other components. A circular opening 6 is centrally located at one end of the cylindrical body. The upper part of the cylindrical base 1 near the opening 6 is cylindrical and has an annular end face 7 at the opening 6. The bottom of the cylindrical base 1 away from the opening 6 is square (in this example, a square with rounded corners) and has a square end face 8 at the bottom. This is not limited to this example and can also be other polygonal shapes. The cylindrical base 1 transitions from the annular end face 7 to the square end face 8 using a transition surface to achieve a smooth outer shell shape. The width of the square end face 8 is greater than the diameter of the annular end face 7, giving the cylindrical base 1 an overall shape that is wider at the top and narrower at the bottom.

[0030] The entire product is generally placed upright or lying down on the bottom of the base 1. The bottom of the base 1 has a large square end face 8, which makes it easier and more secure to place the product. When it is placed lying down, it can prevent the product from rolling, thereby preventing it from rolling off and reducing the risk of accidental triggering.

[0031] A concave surface 9 with a spherical crown-shaped curved surface is provided in the center of the square end face 8. This design is used to make the finger press comfortably when pressing the blood collection needle and to prevent slippage due to pressure.

[0032] The cylinder seat 1 is a shell structure and has a cylinder cavity 10 that communicates with the cylinder opening 6. A lower spring seat 11 is provided at the bottom center of the cylinder cavity 10. The lower spring seat 11 is used to connect the lower elastic element 5. The inner ring of the lower elastic element 5 is fitted on the lower spring seat 11 to realize the installation.

[0033] The cavity 10 is at least two-thirds cylindrical in the portion near the opening 6, which facilitates the design of the track and provides a channel of equal diameter for the sliding of the inner cylinder 2.

[0034] The cylindrical part of the mounting cavity is provided with a sliding groove 12 and a track changing groove on its side wall.

[0035] Two grooves 12 are symmetrically arranged relative to the sliding cavity, and the length direction of the grooves 12 is consistent with the depth direction of the sliding cavity; The track-changing grooves are arranged symmetrically in two groups relative to the sliding cavity. To facilitate efficient layout, the track-changing grooves and sliding grooves 12 are staggered in a cross-shaped distribution. The track-changing groove includes a locking groove 13 and a firing groove 14 connected at their bottom sides. The firing groove 14 is an elongated sliding groove 12 extending in the same direction as the length of the cylinder base 1. A stop block 16 is provided at one end of the firing groove 14 near the cylinder opening 6. The locking groove 13 is located at the bottom of the sliding cavity and is arranged side by side with the firing groove 14. The locking groove 13 and the firing groove 14 have the same width. A connecting channel 1 connecting the two is provided at the bottom of the locking groove 13 and the firing groove 14 adjacent to each other. 5. The top side of the connecting channel 15 has an inclined slope. The two ends of the inclined slope are connected to the slot 13 and the firing slot 14 respectively. That is, the bottom end of the inclined slope is connected to the middle or upper part of the slot wall of the slot 13 (adjacent to the firing slot 14), and the top end of the inclined slope is connected to the slot wall of the firing slot 14 (adjacent to the slot 13). The guide slope creates a gap on the side wall of the slot 13 and the firing slot 14 adjacent to each other, so that the slider 24 can enter the firing slot 14 through the gap after being slightly pressed down, thereby realizing the track change.

[0036] The inner cylinder 2 is cylindrical and adapted to the inner diameter of the sliding cavity. The end of the inner cylinder 2 near the cylinder opening 6 is the front end face. A ring-shaped component 17 is provided in the center of the front end face, which penetrates the inner cylinder 2. The inner diameter of the ring-shaped component 17 is smaller than that of the cylinder opening 6. This diameter difference allows the front end face to be exposed at the position of the cylinder opening 6, but the exposed part is limited. Only by having other components press against the front end face inside the cylinder opening 6 can the inner cylinder 2 be pressed to achieve firing. This is a built-in internal firing effect, which is safer and prevents accidental activation.

[0037] The inner cylinder 2 has an inner cavity adapted to it. The inner cavity is cylindrical and has an open structure at the end away from the front end face that passes through the bottom end of the inner cylinder 2 for communication with the bottom cavity 10.

[0038] The annular component 17 is used to fix the upper elastic component 4, which is disposed in the inner cavity and whose top end is mounted on the annular component 17.

[0039] The outer wall of the inner cylinder 2 is provided with an outwardly protruding slide bar 18, which is located in the slide groove 12 and slides in cooperation with the slide groove 12. In addition, the inner cylinder 2, which is adapted to the inner diameter of the slide cavity, can also help stabilize the sliding. The slide bar 18 and the slide groove 12 can limit the circumferential movement of the inner cylinder 2, so that the inner cylinder 2 cannot rotate relative to the cylinder seat 1.

[0040] The outer wall of the inner cylinder 2 is also symmetrically provided with strip-shaped openings 19 that pass through it. The strip-shaped openings 19 are aligned with the firing groove 14. The bottom end of the strip-shaped openings 19 passes through the bottom side of the inner cylinder 2, thereby making room for the slider 24 that slides in the firing groove 14.

[0041] The bottom of one sidewall of the strip-shaped opening 19 has a triangular notch structure, thereby forming an inclined pressing side 20 at one side of the slot of the strip-shaped opening 19. The pressing side 20 is used to cooperate with the slider 24 to push the seat 21 downward. The position of the pressing side 20 overlaps with the position of the slot 13. When the top of the inner cylinder 2 is located at the cylinder opening 6, the pressing side 20 is exposed above the slot 13.

[0042] Needle assembly: This is the main component used to perform puncture. In this example, the needle assembly includes a base 21 and a needle body 22 assembled and fixed together. The base 21 is a one-piece molded plastic part, and the needle body 22 is a steel needle.

[0043] The upper and lower ends of the base 21 each have circular end faces. Four needles 22 pass through the base 21. The needles 22 are arranged perpendicularly to each other on the opposite end faces. The top of each needle 22 away from the base 21 has a double-beveled needle tip. The needle tip is a double-beveled needle tip.

[0044] The upper end face of the seat 21 is in contact with the bottom surface of the upper elastic element 4, and all the needles 22 are located in the inner ring of the upper elastic element 4.

[0045] The seat 21 is provided with 2-4 raised ribs 23 on its periphery. The outer surface of the raised ribs 23 is in contact with the inner cylinder 2. The raised ribs 23 guide the seat 21 and the inner cylinder 2 to slide up and down. The sliding fit achieved by the raised ribs 23 makes there a distance and space between the periphery of the seat 21 and the cylinder cavity 10, reducing the sliding resistance.

[0046] The seat 21 has a circular boss centered on the end face away from the needle tip, which is used to cooperate with the inner ring of the lower elastic member 5.

[0047] The seat 21 is provided with a slider 24 that protrudes outward along its radial direction. The width of the slider 24 is adapted to the width of the strip opening 19, the firing groove 14 and the slot 13. When the seat 21 is located at the bottom of the inner cylinder 2, the outer side of the slider 24 is close to the inner wall of the sliding cavity.

[0048] The top surface of the slider 24 has a force-bearing surface 25 on the side adjacent to the pressure side 20, which is parallel to the pressure side 20. The force-bearing surface 25 is an inclined surface based on being parallel to the pressure side 20.

[0049] During assembly, the upper elastic element 4 is located between the upper end face of the inner cylinder 2 and the base, and the lower elastic element 5 is located between the lower end face of the base 21 and the bottom of the cylinder seat 1. The slider 18 is slidably engaged in the groove 12, allowing the inner cylinder 2 to slide relative to the cylinder seat 1 in the length direction and stop circumferentially. In the initial state, the slider 24 is located in the slot 13. Under the upward elastic force of the lower elastic element 5 on the base 21, the slider 24 is restricted in the slot 13, keeping all bases 21 stopped within the cylinder seat 1. When the inner cylinder 2 is pressed downward through the cylinder opening 6, the inner cylinder 2 is pressed inward into the cylinder cavity 10 (the inner cylinder 2 slides within the sliding cavity). The pressing side 20 then abuts against the top of the slider 24, simultaneously pressing the base 21 downward, further compressing the lower elastic element 5 and accumulating sufficient elastic potential energy. When the seat 21 moves downwards until the pressure side 20 is below the connecting channel 15, the inclined force-bearing surface 25 slides along the inclined pressure side 20, causing the seat 21 to rotate in a certain direction. With this rotation, the slider 24 enters the firing groove 14 on one side of the slot 13. Since there is no longer any obstruction, the elastic potential energy accumulated by the lower elastic element 5 overcomes the upper elastic element 4 and pops out towards the cylinder opening 6, thus completing the rapid puncture of the needle tip. During the popping process, the seat 21 is squeezed against the upper elastic element 4, and the elastic force gradually increases until it is large enough, and then the needle body 22 is retracted into the cylinder seat 1.

[0050] The main advantages of the above structure are: Activation requires pressing the inner cylinder 2 component inward. The inner cylinder 2 is inside the cylinder opening 6 and is only partially exposed. It needs to be inserted and pressed to change the trajectory for firing, which makes it less likely to be accidentally triggered and improves safety. The components are simple, consisting of several independent small components that, when assembled, achieve the pop-out process based on track changing. The structure is reasonable, the design is simple, and the processing difficulty and cost are reduced.

Claims

1. A blood collection trigger feedback mechanism, characterized in that, The device includes a barrel base, an opening at its upper end, and an inner cylinder that slides along its length and is circumferentially stopped within the barrel base. An annular component, coaxial with the opening, is located near the opening end of the inner cylinder. The inner diameter of the annular component is smaller than that of the opening. A rotatable seat is located at the bottom end of the inner cylinder, slidingly fitted therewith. A lower elastic element is located between the seat and the bottom of the barrel base, and an upper elastic element is located between the seat and the upper end of the barrel base. An upwardly extending needle is fixed to the seat. Symmetrically arranged guide grooves are provided on the inner wall of the barrel base. Each guide groove includes a locking groove and a firing groove arranged side-by-side and of equal width. The firing groove extends along the length of the barrel base. The firing groove has its top end close to the cylinder opening, and the top end of the locking groove does not exceed 1 / 3 of the height of the firing groove. The bottom ends of the locking groove and the firing groove are provided with connecting channels that connect the two. The inner cylinder has symmetrically arranged through-hole strips on its side wall, which correspond to the firing groove. The bottom end of the strips penetrates the bottom side of the inner cylinder. The bottom end of one side wall of the strips has an inclined pressing side, which overlaps with the position of the locking groove. The side wall of the base has symmetrically arranged outwardly protruding sliders, and the top end of the sliders has a force-bearing surface parallel to the pressing side. The sliders are respectively engaged with the locking groove or slidably connected to the firing groove.

2. The blood collection trigger feedback mechanism according to claim 1, characterized in that, The upper part of the cylinder seat near the cylinder opening is cylindrical and has an annular end face at the cylinder opening. The bottom of the cylinder seat away from the cylinder opening is square and has a square end face at the bottom. The shape of the cylinder seat is a layout transition from the annular end face to the square end face.

3. The blood collection trigger feedback mechanism according to claim 2, characterized in that, A concave surface with a spherical crown-shaped curved surface is provided in the center of the square end face.

4. The blood collection trigger feedback mechanism according to claim 1, characterized in that, The cylinder base includes a base body and a cylinder body, with the base body located at the bottom of the cylinder body and the two being fixedly engaged.

5. The blood collection trigger feedback mechanism according to claim 1, characterized in that, The cylinder base is a shell structure with an internal cavity communicating with the cylinder opening. The two-thirds portion of the cylinder cavity near the cylinder opening is a cylindrical sliding cavity. The inner cylinder is cylindrical and adapted to the inner diameter of the sliding cavity. Two sliding grooves are symmetrically provided on the inner wall of the sliding cavity. The outer wall of the inner cylinder is provided with an outwardly protruding sliding strip. The sliding strip is located in the sliding groove and slides in cooperation with the sliding groove.

6. The blood collection trigger feedback mechanism according to claim 1, characterized in that, The upper and lower ends of the base have circular end faces respectively. The needle body is perpendicular to the upper end face. The top of the needle body away from the upper end face is provided with a needle tip. The upper elastic element and the lower elastic element are both helical springs. The bottom end of the upper elastic element is in contact with the upper end face of the base. The top end of the upper elastic element is sleeved on the annular part. The top end of the lower elastic element is in contact with the lower end face of the base. The bottom end of the lower elastic element is located at the bottom of the cylinder base.

7. The blood collection trigger feedback mechanism according to claim 1, characterized in that, The seat body is provided with 2-4 raised ribs on its periphery, and the outer surface of the raised ribs slides in contact with the inner cylinder.

8. The blood collection trigger feedback mechanism according to claim 1, characterized in that, A stop is provided at one end of the firing groove near the barrel opening.

9. The blood collection trigger feedback mechanism according to claim 1, characterized in that, The top side of the connecting channel has an inclined slope, and the two ends of the inclined slope are respectively connected to the slot and the firing slot. That is, the bottom end of the inclined slope is connected to the middle or upper part of the slot wall, and the top end of the inclined slope is connected to the firing slot wall.

10. The blood collection trigger feedback mechanism according to claim 1, characterized in that, The bottom end of one sidewall of the strip-shaped opening forms a triangular notch structure based on the compression side.

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