Extension head of pipette tip
By designing a pipette tip extension head and connecting it to the tip using a plate clamp and a connecting tube, the problems of diaphragm damage and gas leakage during the pipetting of toxic liquids were solved, achieving safe and accurate liquid transfer.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-31
- Publication Date
- 2026-04-07
AI Technical Summary
Existing pipette tips can damage the membrane of a flask if they are directly punctured when handling toxic and volatile liquids, or leak toxic gases if the cap is opened. Using a syringe for pipetting results in large errors and poses safety hazards.
A pipette tip extension head was designed, including a plate clamp and a connecting tube. The tip is held by a torque spring and an arc-shaped head to achieve a reliable connection with the tip. The tip is inserted into the membrane vial for pipetting, avoiding gas leakage.
This technology enables the safe and precise removal of toxic liquids without damaging the diaphragm vial, avoiding leakage and errors of toxic gases, and improving the safety and efficiency of the operation.
Smart Images
Figure CN224086780U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of pipette technology, specifically to a pipette tip extension. Background Technology
[0002] Pipettes are commonly used tools in laboratories for the precise transfer of liquid samples. Common pipette ranges are 0.1-10 mL. When analyzing toxic materials such as acrylonitrile or cyanide-containing substances, 5-10 mL of sample needs to be transferred to a patch vial. Existing pipette tips have relatively large diameters; directly puncturing the membrane of the vial during pipetting would cause significant damage, rendering the vial unusable. Opening the vial cap for pipetting can easily release large amounts of toxic gases, harmful to humans and the environment. While using injectable solutions allows for pipetting through the membrane with a needle, preserving the vial's usability, the error margin is larger when using syringes to transfer toxic liquids. Weighing is required, leading to prolonged sample exposure and increasing the risk of toxic gas release into the air, posing a safety hazard. Utility Model Content
[0003] The technical problem to be solved by this utility model is to propose a pipette tip extension that can be easily connected to the original pipette tip. When transferring toxic and volatile liquids, it can be directly inserted into the membrane of the diaphragm bottle for pipetting without affecting the continued use of the diaphragm bottle, while avoiding excessive leakage of toxic and harmful gases into the air.
[0004] The pipette tip extension head of this utility model includes a clamp, which comprises a first plate and a second plate hinged together. A torque spring is provided at the hinge of the first plate and the second plate, and the torque spring includes two abutting ends, which abut against the first plate and the second plate respectively, thereby opening one side of the first plate and the second plate. An arc-shaped head is provided on the side of the first plate and the second plate away from the abutting ends, and the concave surfaces of the two arc-shaped heads are arranged opposite each other. A blade is provided along the arc surface on the concave surface of the arc-shaped head. A connecting tube is connected to the lower part of the arc-shaped head. The two arc-shaped heads are connected to the two sides of the connecting tube respectively through connecting strips. The connecting strips are made of flexible material. The connecting tube includes a connecting part and a needle head. The connecting part is open at the top, and a sealing gasket is provided on the inner wall of the connecting part. The connecting part can be fitted onto the outside of the tip end. When the connecting part is fitted onto the outside of the tip end, the inner wall of the sealing gasket is in contact with the outer wall of the tip end. A needle head is connected below the connecting part. The needle head is a rigid tubular structure.
[0005] Preferably, a first hinge seat is provided on plate one, and a second hinge seat is provided on plate two. The first hinge seat and the second hinge seat are hinged together by a hinge shaft, which passes through a torque spring.
[0006] Preferably, the connecting strip is a nylon strip.
[0007] Preferably, the tip of the needle has an oblique opening.
[0008] Preferably, when the connector is fitted onto the outside of the tip end, the upper part of the sealing gasket is in contact with the outer wall of the tip end, and the lower part of the sealing gasket extends beyond the lower end of the tip. This ensures that there are no gaps between the tip and the connector in the liquid path, preventing liquid from entering the connector and remaining there.
[0009] Preferably, the sealing gasket includes an upper sealing portion and a lower guiding portion. The angle between the inner wall of the guiding portion and the inner wall of the connecting portion is an acute angle with the opening facing upward, which facilitates the downward flow of liquid and reduces residue.
[0010] Preferably, the connection between the inner wall of the sealing part and the inner wall of the guide part is an arc-shaped surface, which makes it easier for liquid to flow through.
[0011] Preferably, it also includes a needle protection component, which includes a needle pad and a spring. The needle pad is made of an elastomer and is connected to the spring through a pad support plate. The spring is movably sleeved on the outside of the needle head. The upper end of the spring is fixed to the outside of the connecting part, and the lower end of the spring is connected to the pad support plate. The pad support plate is located on the side of the needle pad away from the needle head, and the pad support plate has a through-hole corresponding to the needle head. When the spring is in an unloaded state, the end of the needle head inserts into the needle pad.
[0012] Preferably, the outer wall of the connecting part is provided with a fixing ring, and multiple fixing rings are provided along the periphery of the connecting part, with the upper end of the spring passing through the fixing ring;
[0013] The pad support plate is equipped with a clamping plate, which is located on both sides of the needle pad and clamps the needle pad. The clamping plate is connected to the spring through a hook.
[0014] Preferably, the needle pad has a slit that penetrates the needle head. More preferably, the slit is cross-shaped.
[0015] Compared with the prior art, the beneficial effects of this utility model are:
[0016] 1. When using, hold the clamp to overcome the torque spring force, so that the distance between the open sides of plate one and plate two decreases and the distance between the two arc-shaped heads increases. Place the suction head between the two arc-shaped heads, align the connecting part with the suction head, and then lift it up so that the inner wall of the sealing gasket is in contact with the outer wall of the suction head end to achieve a seal. Then release plate one and plate two so that the two arc-shaped heads are clamped on the suction head. Under the action of the torque spring, the tip of the blade is embedded in the outer wall of the suction head without cutting the suction head. This makes the connection between the connecting tube and the suction head more reliable, and the connecting tube is not easy to fall off downwards when the liquid is squeezed out of the suction head.
[0017] 2. Multiple blades can be installed at different heights for better fixation; because the connecting strip is made of flexible material, the connection between the arc head and the connecting pipe is not affected when the arc head is opened.
[0018] 3. The needle tip has a small aperture, which can be inserted into the membrane of the membrane bottle for pipetting. The insertion and withdrawal cause minimal damage to the membrane, do not affect the subsequent use of the membrane bottle, and will not cause a large amount of toxic gas leakage.
[0019] 4. This utility model is easy to use and does not require modification of existing pipette tips. It can be directly connected to pipette tips for use. When handling toxic liquids, it avoids damaging the membrane bottle, achieves rapid liquid transfer, and avoids leakage of large amounts of toxic gas. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the external structure of the plate clamp and the connecting pipe;
[0021] Figure 2 This is a cross-sectional structural diagram of the plate clamp, connecting tube, and needle protection assembly;
[0022] Figure 3 yes Figure 1 Another structural diagram;
[0023] Figure 4 yes Figure 2 Schematic diagram of the structure at point A in the middle;
[0024] Figure 5 yes Figure 2 Schematic diagram of the structure at point B;
[0025] Figure 6 yes Figure 2 Schematic diagram of the structure at point C;
[0026] Figure 7 yes Figure 2 Schematic diagram of the structure at point D;
[0027] Figure 8 This is a schematic diagram of the support plate structure viewed from below.
[0028] In the diagram: 1. Plate 1; 2. Plate 2; 3. Torque spring; 4. Abutment end; 5. Arc-shaped head; 6. Blade; 7. Connecting tube; 8. Connecting strip; 9. Connecting part; 10. Needle head; 11. Sealing gasket; 12. Suction head; 13. First hinge seat; 14. Second hinge seat; 15. Hinge shaft; 16. Sealing part; 17. Guide part; 18. Spring; 19. Needle pad; 20. Pad support plate; 21. Through port; 22. Fixing ring; 23. Clamping plate; 24. Hook; 25. Cut. Detailed Implementation
[0029] The present invention will now be described clearly and completely with reference to the accompanying drawings.
[0030] Example 1
[0031] like Figure 1 , Figure 2 , Figure 3 As shown, the pipette tip extension head of this utility model includes a clamp, which comprises a first plate 1 and a second plate 2 hinged together. A torque spring 3 is provided at the hinge of the first plate 1 and the second plate 2. The torque spring 3 includes two abutting ends 4, which abut against the first plate 1 and the second plate 2 respectively, thereby opening one side of the first plate 1 and the second plate 2. An arc-shaped head 5 is provided on the side of the first plate 1 and the second plate 2 away from the abutting ends 4. The concave surfaces of the two arc-shaped heads 5 are arranged opposite each other, and a blade 6 is provided along the arc surface on the concave surface of the arc-shaped head 5. The lower part of the arc-shaped head 5 is connected to... There is a connecting tube 7, and two arc-shaped heads 5 are connected to the two sides of the connecting tube 7 respectively by connecting strips 8. The connecting strips 8 are made of flexible material, specifically nylon strips. The connecting tube 7 includes a connecting part 9 and a needle head 10. The connecting part 9 has an opening at the top, and a sealing gasket 11 is provided on the inner wall of the connecting part 9. The connecting part 9 can be fitted onto the outer side of the end of the suction head 12. When the connecting part 9 is fitted onto the outer side of the end of the suction head 12, the inner wall of the sealing gasket 11 is in contact with the outer wall of the end of the suction head 12. The needle head 10 is connected below the connecting part 9. The needle head 10 is a rigid tubular structure, and the end of the needle head 10 has an oblique opening.
[0032] like Figure 3 As shown, a first hinge seat 13 is provided on plate 1, and a second hinge seat 14 is provided on plate 2. The first hinge seat 13 and the second hinge seat 14 are hinged together by a hinge shaft 15, which passes through a torque spring 3.
[0033] The working process is as follows: During use, the hand clamp overcomes the force of the torque spring 3, causing the distance between the open sides of plate 1 and plate 2 to decrease, and the distance between the two arc-shaped heads 5 to increase. The suction head 12 is placed between the two arc-shaped heads 5, aligning the connecting part 9 with the suction head 12. Then, it is lifted so that the inner wall of the sealing gasket 11 is in contact with the outer wall of the suction head 12 end to achieve a seal. Then, plate 1 and plate 2 are released, allowing the two arc-shaped heads 5 to clamp onto the suction head 12. Under the action of the torque spring 3, as... Figure 4 As shown, the tip of the blade 6 is embedded in the outer wall of the suction head 12 without cutting the suction head 12. This makes the connection between the connecting tube 7 and the suction head 12 more secure, and the connecting tube 7 is less likely to fall off downwards when liquid is squeezed out of the suction head 12.
[0034] Example 2
[0035] like Figure 5 As shown, based on Embodiment 1, when the connecting part 9 is fitted onto the outer side of the end of the suction head 12, the upper part of the sealing gasket 11 is in contact with the outer wall of the end of the suction head 12, and the lower part of the sealing gasket 11 extends out of the lower end of the suction head 12. This ensures that there are no gaps between the suction head 12 and the inner wall of the connecting part 9 in the liquid passage, preventing liquid from the suction head 12 from entering the connecting part 9 and leaving residue.
[0036] The sealing gasket 11 includes an upper sealing part 16 and a lower flow guiding part 17. The angle between the inner wall of the flow guiding part 17 and the inner wall of the connecting part 9 is an acute angle with the opening facing upward, which facilitates the downward flow of liquid and reduces residue.
[0037] The connection between the inner wall of the sealing part 16 and the inner wall of the guide part 17 is an arc-shaped surface, which makes it easier for liquid to flow through.
[0038] Example 3
[0039] Based on Example 2, such as Figure 2 As shown, it also includes a needle protection assembly, which includes a needle pad 19 and a spring 18. The needle pad 19 is made of an elastomer and is connected to the spring 18 through a pad support plate 20. The spring 18 is movably sleeved on the outside of the needle head 10. The upper end of the spring 18 is fixed to the outside of the connecting part 9, and the lower end of the spring 18 is connected to the pad support plate 20. The pad support plate 20 is located on the side of the needle pad 19 away from the needle head 10. The pad support plate 20 has a through-hole 21 corresponding to the needle head 10. When the spring 18 is in an unloaded state, the end of the needle head 10 pierces into the needle pad 19.
[0040] like Figure 6 As shown, a fixing ring 22 is provided on the outer wall of the connecting part 9, and multiple fixing rings 22 are provided along the periphery of the connecting part 9. The upper end of the spring 18 passes through the fixing ring 22.
[0041] like Figure 7 As shown, the pad support plate 20 is provided with a clamping plate 23. The clamping plate 23 is located on both sides of the needle pad 19 and clamps the needle pad 19. The clamping plate 23 is connected to the spring 18 through the hook 24, that is, the hook 24 is hung on the spring 18.
[0042] like Figure 8 As shown, the needle pad 19 has a cut 25 through the needle head 10, which is cross-shaped. The cut 25 makes it easier for the needle head 10 to pass through the needle pad 19.
[0043] In this embodiment 3, the end of the needle tip 10 is embedded in the needle pad 19, sealing the end of the needle tip 10 and preventing the operator from being pricked by the needle tip 10 during use. When transferring toxic liquids, the pad support plate 20 rests against the container opening, and the needle tip 10 continues to penetrate the needle pad 19 to draw liquids, overcoming the elastic force of the spring 18. After the liquid is drawn, the needle pad 19 is pushed outward under the elastic force of the spring 18, placing the end of the needle tip 10 inside the needle pad 19. Since the needle pad 19 is made of an elastic material, the opening of the needle tip 10 can be sealed by the needle pad 19, preventing the evaporation of toxic liquids during transfer. When liquid needs to be injected into a diaphragm bottle, the needle pad 19 rests against the mouth of the diaphragm bottle, and the needle tip 10 is pushed downwards, with the end of the needle tip 10 passing through the needle pad 19 and the diaphragm, injecting the liquid into the diaphragm bottle. When the needle pad 19 needs to be replaced, simply remove the hook 24 from the spring 18, disengage the pad support plate 20 from the spring 18, and remove the needle pad 19 from the clamping plate 23 to replace the needle pad 19.
Claims
1. A pipette tip extension, characterized in that, The system includes a clamp, which comprises a hinged plate body 1 (1) and a plate body 2 (2). A torque spring (3) is provided at the hinge of the plate body 1 (1) and the plate body 2 (2). The torque spring (3) includes two abutting ends (4), which abut against the plate body 1 (1) and the plate body 2 (2) respectively, thereby opening one side of the plate body 1 (1) and the plate body 2 (2). The side of the plate body 1 (1) and the plate body 2 (2) away from the abutting ends (4) is provided with an arc-shaped head (5). The concave surfaces of the two arc-shaped heads (5) are arranged opposite each other. A blade (6) is provided along the arc surface on the concave surface of the arc-shaped head (5). The lower part of the arc-shaped head (5) is connected to... The connector (7) is connected to the two sides of the connector (7) via a connecting strip (8). The connecting strip (8) is made of a flexible material. The connector (7) includes a connecting part (9) and a needle head (10). The connecting part (9) has an opening at the top and a sealing gasket (11) is provided on the inner wall of the connecting part (9). The connecting part (9) can be fitted onto the outer side of the end of the suction head (12). When the connecting part (9) is fitted onto the outer side of the end of the suction head (12), the inner wall of the sealing gasket (11) is in contact with the outer wall of the end of the suction head (12). The needle head (10) is connected below the connecting part (9). The needle head (10) is a rigid tubular structure.
2. The pipette tip extension head according to claim 1, characterized in that, The first hinge seat (13) is provided on the first plate (1), and the second hinge seat (14) is provided on the second plate (2). The first hinge seat (13) and the second hinge seat (14) are hinged together by a hinge shaft (15), which passes through a torque spring (3).
3. The pipette tip extension head according to claim 1, characterized in that, The connecting strip (8) is a nylon strip.
4. The pipette tip extension head according to claim 1, characterized in that, The end of the needle head (10) is obliquely open.
5. The pipette tip extension head according to claim 1, characterized in that, When the connecting part (9) is fitted onto the outside of the end of the suction head (12), the upper part of the sealing gasket (11) is in contact with the outer wall of the end of the suction head (12), and the lower part of the sealing gasket (11) extends out of the lower end of the suction head (12).
6. The pipette tip extension head according to claim 5, characterized in that, The sealing gasket (11) includes an upper sealing part (16) and a lower guide part (17). The angle between the inner wall of the guide part (17) and the inner wall of the connecting part (9) is an acute angle with the opening facing upward.
7. The pipette tip extension head according to claim 6, characterized in that, The connection between the inner wall of the sealing part (16) and the inner wall of the guide part (17) is an arc-shaped surface.
8. The pipette tip extension head according to claim 1, characterized in that, It also includes a needle protection component, which includes a needle pad (19) and a spring (18). The needle pad (19) is made of an elastomer. The needle pad (19) is connected to the spring (18) through a pad support plate (20). The spring (18) is movably sleeved on the outside of the needle head (10). The upper end of the spring (18) is fixed to the outside of the connecting part (9). The lower end of the spring (18) is connected to the pad support plate (20). The pad support plate (20) is located on the side of the needle pad (19) away from the needle head (10). The pad support plate (20) has a through hole (21) corresponding to the needle head (10). When the spring (18) is in an unloaded state, the end of the needle head (10) is inserted into the needle pad (19).
9. The pipette tip extension head according to claim 8, characterized in that, The outer wall of the connecting part (9) is provided with a fixing ring (22), and multiple fixing rings (22) are provided along the periphery of the connecting part (9). The upper end of the spring (18) passes through the fixing ring (22). The pad support plate (20) is provided with a clamping plate (23). The clamping plate (23) is located on both sides of the needle pad (19) and clamps the needle pad (19). The clamping plate (23) is connected to the spring (18) through the hook (24).
10. The pipette tip extension head according to claim 9, characterized in that, The needle pad (19) has a cut (25) that passes through the needle head (10) corresponding to the needle head (10).