Microvacuum blood sampling device
By designing an adjustable vacuum blood collection device, the problem of the non-adjustable vacuum degree of vacuum blood collection tubes was solved, achieving stability and accuracy in the blood collection process, and making it suitable for the collection of small blood samples from various patient groups.
Patent Information
- Application Number
- CN202521219221.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-16
- Publication Date
- 2026-11-03
- Estimated Expiration
- 2035-06-16
AI Technical Summary
The vacuum level of existing vacuum blood collection tubes cannot be adjusted, resulting in excessively fast blood collection speed, which can easily cause local tissue damage. Furthermore, it is difficult to accurately control the amount of blood collected, making them particularly unsuitable for people with fragile blood vessels, such as children and the elderly.
A micro-vacuum blood collection device was designed, comprising a blood collection needle assembly, a blood collection tube assembly, and an adjustment assembly. The vacuum level inside the blood collection tube is adjusted by the adjustment assembly. The design of the screw and the movable seat makes the vacuum level adjustable. The combination of the knob and the sealing ring improves the sealing performance and ensures a smooth blood collection process. Transparent material and scale lines are set to facilitate observation and control of the blood collection volume.
It achieves a smooth and slow blood collection process, improves the accuracy and safety of micro-blood collection, reduces the risk of tissue damage to patients, and is suitable for micro-blood sample collection from various patient groups.
Smart Images
Figure CN224925157U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of medical device technology, specifically a micro-vacuum blood collection device. Background Technology
[0002] Vacuum blood collection technology is a method of collecting blood by using a double-ended needle to directly introduce the patient's blood from the vein into a sealed vacuum tube using a pressure difference. The principle of vacuum blood collection tubes is that the capped blood collection tubes are pre-evacuated to different degrees of vacuum, and the negative pressure is used to automatically and quantitatively collect venous blood samples. One end of the blood collection needle is inserted into the human vein, and the other end is inserted into the rubber stopper of the vacuum blood collection tube. The human venous blood is inside the vacuum blood collection tube, and under the action of negative pressure, it passes through the blood collection needle into the blood sample container. Multiple tubes can be collected in one venous puncture without leakage. For patients who are difficult to collect blood, such as children, patients with severe burns, extremely obese patients, and patients with severe bleeding tendencies, it is not advisable to collect large amounts of blood; instead, only small amounts of blood are usually collected.
[0003] Based on the above, the inventors have discovered the following problems: the vacuum of current vacuum blood collection tubes is too large, the vacuum inside the vacuum blood collection tubes cannot be adjusted, the amount of blood collected in micro-blood collection is too small, which will make the blood collection speed too fast and easily cause local tissue damage. This is not friendly to patients, especially children, the elderly and other people with fragile blood vessels. At the same time, it is difficult to accurately control the amount of blood collected, which is not conducive to the accurate collection of micro-blood samples.
[0004] Therefore, in view of this, we will study and improve the existing structure and its shortcomings to provide a micro-vacuum blood collection device, in order to achieve a more practical purpose. Summary of the Invention
[0005] The purpose of this invention is to provide a micro-volume vacuum blood collection device to solve the problems mentioned in the background art.
[0006] In view of the above problems, the technical solution proposed by this utility model is as follows: A micro-vacuum blood collection device includes a blood collection needle assembly, a blood collection tube assembly, and an adjustment assembly. The blood collection needle assembly is located outside the blood collection tube assembly, and the adjustment assembly is located at the bottom of the blood collection tube assembly. The adjustment assembly is used to adjust the vacuum level inside the blood collection tube assembly. The blood collection tube assembly includes a vacuum blood collection tube with a stopper at its upper end. The adjustment assembly includes an adjustment cylinder, the upper end of which is connected to the bottom end of the vacuum blood collection tube. The adjustment cylinder has a cavity inside, and a screw is rotatably connected to the bottom end of the cavity. A movable seat is threaded onto the outside of the screw, and the outer wall of the movable seat slides against the inner wall of the cavity. A connecting rod is connected to the upper end of the movable seat. The connecting rod is hollow inside, and the end of the connecting rod away from the movable seat is located inside the vacuum blood collection tube. An adjustment disc is installed at the end of the connecting rod away from the movable seat, and the outer wall of the adjustment disc is tightly fitted against the inner wall of the vacuum blood collection tube.
[0007] Furthermore, both the movable seat and the cavity are square, and the bottom end of the screw extends through the adjusting cylinder to the outside and is fitted with a knob.
[0008] The beneficial effects of adopting the above-mentioned further solution are that, since the movable seat and cavity are set in a square shape, when the screw rotates, the movable seat can only move upward or downward under the sliding cooperation with the cavity. When the movable seat moves downward, the internal space of the vacuum blood collection tube increases. Under the condition that other factors remain unchanged, the vacuum degree inside the vacuum blood collection tube will decrease. The vacuum degree refers to the degree to which the gas pressure inside the tube is lower than the atmospheric pressure. The increase in volume will increase the relative number of gas molecules inside the tube, increase the gas pressure, and thus reduce the vacuum degree. A smaller vacuum degree can make the blood collection process more stable and slower, making it easier for medical staff to control the blood collection volume and improve the accuracy and safety of micro-blood collection. By setting a knob, which is set on the outside of the adjusting cylinder, it is easy to rotate the knob to realize the rotation of the screw.
[0009] Furthermore, both the vacuum blood collection tube and the adjusting cylinder have through holes at their opposite ends, and a sealing ring is provided between a pair of through holes. The outer wall of the sealing ring is fixedly connected to the inner wall of the through hole, and the inner wall of the sealing ring is tightly fitted to the outer wall of the connecting rod.
[0010] The beneficial effect of adopting the above-mentioned further solution is that by setting a sealing ring, the sealing between the vacuum blood collection tube, the regulating cylinder and the connecting rod is improved, thus preventing blood from flowing from the vacuum blood collection tube into the regulating cylinder.
[0011] Furthermore, the plug sleeve has a built-in rubber ring installed inside, and the blood collection needle assembly includes a connector that is inserted into the built-in rubber ring.
[0012] The beneficial effect of adopting the above-mentioned further solution is that by setting a built-in rubber ring, the connector is inserted into the built-in rubber ring, thereby realizing the connection between the blood collection needle assembly and the blood collection tube assembly, while forming a seal to prevent blood from spilling out.
[0013] Furthermore, the connector has a flexible tube connected to one end away from the vacuum blood collection tube, and a needle hub connected to the other end of the flexible tube away from the connector. A needle is installed on the upper end of the needle hub.
[0014] The advantage of using the above-mentioned further method is that by puncturing the patient with a needle, the blood will flow through the tubing into the connector. The user can then insert the connector into the vacuum blood collection tube to complete the blood collection from the patient.
[0015] Furthermore, a sleeve is fitted around the outside of the needle hub, the inner wall of the sleeve is fixedly connected to the outer wall of the needle hub, and a protective cap is threaded onto the upper part of the sleeve, with a protective gasket installed on the inner top of the protective cap.
[0016] The beneficial effects of adopting the above-mentioned further solution are that by setting a sleeve to fix the needle hub, and the protective cap is threadedly connected to the sleeve, it is easy to disassemble and install the protective cap. Before blood collection, the protective cap is unscrewed and the needle is used for puncture. After blood collection, the protective cap is tightened again to prevent accidental puncture of medical staff. The needle head is protected by setting a protective gasket.
[0017] Furthermore, both the vacuum blood collection tube and the regulating cylinder are transparent, and the outer wall of the vacuum blood collection tube is provided with scale lines.
[0018] The beneficial effects of adopting the above-mentioned further solution are that by making the vacuum blood collection tube and the adjusting cylinder transparent, the transparent vacuum blood collection tube makes it easy to observe the blood collection inside, the transparent adjusting cylinder makes it easy to observe the position of the moving seat, and the blood collection volume can be accurately read by setting scale lines on the outside of the vacuum blood collection tube.
[0019] Compared with the prior art, the beneficial effects of this utility model are as follows: This micro-vacuum blood collection device, by setting a knob outside the adjusting cylinder, facilitates the rotation of the screw. Because the moving seat and cavity are square, when the screw rotates, the moving seat can only move upwards or downwards through sliding contact with the cavity. When the moving seat moves downwards, the adjusting disc moves downwards inside the vacuum blood collection tube under the connection of the connecting rod, increasing the internal space of the vacuum blood collection tube. Under otherwise unchanged conditions, the vacuum degree inside the vacuum blood collection tube will decrease. Vacuum degree refers to the degree to which the gas pressure inside the tube is lower than atmospheric pressure. Increased volume leads to a relative increase in the number of gas molecules inside the tube, increasing the gas pressure and thus lowering the vacuum degree. A lower vacuum degree allows for a smoother and slower blood collection process, making it easier for medical personnel to control the blood collection volume and improving the accuracy and safety of micro-blood collection. Attached Figure Description
[0020] Figure 1 A three-dimensional structural diagram of the micro-volume vacuum blood collection device provided by this utility model; Figure 2 Exploded cross-sectional view of the blood collection tube assembly of the micro-vacuum blood collection device provided by this utility model; Figure 3 A cross-sectional view of the movable base and connecting rod of the micro-volume vacuum blood collection device provided by this utility model; Figure 4 An exploded three-dimensional structural diagram of the blood collection needle assembly of the micro-vacuum blood collection device provided by this utility model; Figure 5 A front cross-sectional view of the protective cover of the micro-vacuum blood collection device provided by this utility model.
[0021] In the diagram: 1. Blood collection needle assembly; 11. Connector; 12. Tube; 13. Needle hub; 14. Needle; 15. Sleeve; 16. Protective cap; 17. Protective washer; 2. Blood collection tube assembly; 21. Vacuum blood collection tube; 22. Plug; 23. Internal rubber ring; 3. Adjustment assembly; 31. Adjustment cylinder; 32. Screw; 33. Movable seat; 34. Connecting rod; 35. Adjustment disc; 36. Sealing ring. Detailed Implementation
[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0023] Please see Figures 1-5This utility model provides a technical solution: a micro-vacuum blood collection device, including a blood collection needle assembly 1, a blood collection tube assembly 2, and an adjustment assembly 3. The blood collection needle assembly 1 is disposed outside the blood collection tube assembly 2, and the adjustment assembly 3 is disposed at the bottom end of the blood collection tube assembly 2. The adjustment assembly 3 is used to adjust the vacuum degree inside the blood collection tube assembly 2. The blood collection tube assembly 2 includes a vacuum blood collection tube 21, and a stopper 22 is provided at the upper end of the vacuum blood collection tube 21. The adjustment assembly 3 includes an adjustment cylinder 31, the upper end of which is connected to the bottom end of the vacuum blood collection tube 21. A cavity is opened inside the adjustment cylinder 31, and a screw 32 is rotatably connected to the bottom end of the cavity. A movable seat 33 is threadedly connected to the outside of the screw 32. The outer wall of the movable seat 33 slides with the inner wall of the cavity. A connecting rod 34 is connected to the upper end of the movable seat 33. The interior of the connecting rod 34 is hollow. The connecting rod 34 is located away from the cavity. One end of the movable seat 33 is located inside the vacuum blood collection tube 21. An adjusting plate 35 is installed at the end of the connecting rod 34 away from the movable seat 33. The outer wall of the adjusting plate 35 is tightly fitted to the inner wall of the vacuum blood collection tube 21. When the screw 32 rotates, the movable seat 33 moves downward under the sliding cooperation with the cavity. Under the connection of the connecting rod 34, the adjusting plate 35 will move downward inside the vacuum blood collection tube 21, making the internal space of the vacuum blood collection tube 21 larger. Under the same conditions, the vacuum degree inside the vacuum blood collection tube 21 will decrease. The vacuum degree refers to the degree to which the gas pressure inside the tube is lower than the atmospheric pressure. The increase in volume will increase the relative number of gas molecules inside the tube, increase the gas pressure, and thus reduce the vacuum degree. A smaller vacuum degree can make the blood collection process more stable and slower, making it easier for medical staff to control the blood collection volume and improve the accuracy and safety of micro-blood collection.
[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0025] Please see Figures 1-5The present invention provides the following technical solution: the movable seat 33 and the cavity are both square. The bottom end of the screw 32 extends through the adjusting cylinder 31 to the outside and is fitted with a knob. The vacuum blood collection tube 21 and the adjusting cylinder 31 are both provided with through holes at opposite ends. A sealing ring 36 is provided between a pair of through holes. The outer wall of the sealing ring 36 is fixedly connected to the inner wall of the through hole. The inner wall of the sealing ring 36 is tightly fitted to the outer wall of the connecting rod 34. Because the movable seat 33 and the cavity are set in a square shape, when the screw 32 rotates, the movable seat 33 can only move up or down under the sliding cooperation with the cavity. By setting the knob, which is set outside the adjusting cylinder 31, it is easy to rotate the knob to realize the rotation of the screw 32. By setting the sealing ring 36, the sealing between the vacuum blood collection tube 21, the adjusting cylinder 31 and the connecting rod 34 is improved, and blood is prevented from flowing from the vacuum blood collection tube 21 into the adjusting cylinder 31.
[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0027] Please see Figures 1-5 The present invention provides the following technical solution: A built-in rubber ring 23 is installed inside the plug sleeve 22. The blood collection needle assembly 1 includes a connector 11, which is inserted into the built-in rubber ring 23. A flexible tube 12 is connected to the end of the connector 11 away from the inside of the vacuum blood collection tube 21. A needle holder 13 is connected to the end of the flexible tube 12 away from the connector 11. A needle 14 is installed at the upper end of the needle holder 13. A sleeve 15 is fitted over the outside of the needle holder 13. The inner wall of the sleeve 15 is fixedly connected to the outer wall of the needle holder 13. A protective cap 16 is threaded onto the outer side of the sleeve 15 near its upper end. A protective gasket 17 is installed on the inner top of the protective cap 16. Both the vacuum blood collection tube 21 and the adjusting cylinder 31 are transparent, and the outer wall of the vacuum blood collection tube 21 has graduation lines. The protective cap 16 is unscrewed before blood collection. The cap 16 is then punctured by the needle 14, and the blood will flow along the tubing 12 into the connector 11. The user inserts the connector 11 into the built-in rubber ring 23, thereby connecting the blood collection needle assembly 1 and the blood collection tube assembly 2 and forming a seal to prevent blood from spilling out, thus completing the blood collection from the patient. After blood collection, the protective cap 16 is tightened again to prevent accidental puncture of medical personnel. The head of the needle 14 is protected by a protective gasket 17. The vacuum blood collection tube 21 and the adjusting cylinder 31 are made transparent. The transparent vacuum blood collection tube 21 makes it easy to observe the blood collection inside, and the transparent adjusting cylinder 31 makes it easy to observe the position of the moving seat 33. The blood collection volume can be accurately read by setting scale lines on the outside of the vacuum blood collection tube 21.
[0028] Specifically, the working principle of this micro-vacuum blood collection device is as follows: During use, the screw 32 is rotated by turning a knob. Because the movable seat 33 and the cavity are square, when the screw 32 rotates, the movable seat 33 can only move upwards or downwards through sliding contact with the cavity. When the movable seat 33 moves downwards, the adjusting disc 35 moves downwards inside the vacuum blood collection tube 21 under the connection of the connecting rod 34, increasing the internal space of the vacuum blood collection tube 21. Under otherwise unchanged conditions, the vacuum level inside the vacuum blood collection tube 21 will decrease. Vacuum level refers to the degree to which the gas pressure inside the tube is lower than atmospheric pressure. Increased volume leads to a relative increase in the number of gas molecules inside the tube, increasing the gas pressure and thus lowering the vacuum level. A lower vacuum level allows for... The blood collection process is smoother and slower, making it easier for medical staff to control the amount of blood collected and improving the accuracy and safety of micro-blood collection. The transparent adjustment tube 31 makes it easy to observe the position of the moving seat 33. Before blood collection, unscrew the protective cap 16 and then use the needle 14 to puncture. The blood will then enter the connector 11 through the tubing 12. The user inserts the connector 11 into the built-in rubber ring 23, thereby realizing the connection between the blood collection needle assembly 1 and the blood collection tube assembly 2, and forming a seal to prevent blood from spilling out. This completes the blood collection from the patient. After blood collection, tighten the protective cap 16 again to prevent accidental puncture to medical staff. The transparent vacuum blood collection tube 21 makes it easy to observe the blood collection inside. The blood collection volume can be accurately read by setting scale lines on the outside of the vacuum blood collection tube 21.
[0029] It should be noted that all standard parts used in this application can be purchased from the market, and can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. Furthermore, since this application is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail in this application.
Claims
1. A micro-volume vacuum blood collection device, characterized in that, The device includes a blood collection needle assembly (1), a blood collection tube assembly (2), and an adjustment assembly (3). The blood collection needle assembly (1) is located outside the blood collection tube assembly (2). The adjustment assembly (3) is located at the bottom of the blood collection tube assembly (2). The adjustment assembly (3) is used to adjust the vacuum level inside the blood collection tube assembly (2). The blood collection tube assembly (2) includes a vacuum blood collection tube (21). The upper end of the vacuum blood collection tube (21) is provided with a plug (22). The adjustment assembly (3) includes an adjustment cylinder (31). The upper end of the adjustment cylinder (31) is connected to the bottom end of the vacuum blood collection tube (21). The interior of the adjustment cylinder (31) is... There is a cavity, and a screw (32) is rotatably connected to the bottom of the cavity. A movable seat (33) is connected to the external thread of the screw (32). The outer wall of the movable seat (33) slides with the inner wall of the cavity. A connecting rod (34) is connected to the upper end of the movable seat (33). The interior of the connecting rod (34) is hollow. The end of the connecting rod (34) away from the movable seat (33) is located inside the vacuum blood collection tube (21). An adjusting plate (35) is installed at the end of the connecting rod (34) away from the movable seat (33). The outer wall of the adjusting plate (35) is tightly fitted with the inner wall of the vacuum blood collection tube (21).
2. The micro-volume vacuum blood collection device according to claim 1, characterized in that, Both the movable seat (33) and the cavity are square. The bottom end of the screw (32) extends through the adjusting cylinder (31) to the outside and is fitted with a knob.
3. The micro-volume vacuum blood collection device according to claim 1, characterized in that, Both the vacuum blood collection tube (21) and the regulating cylinder (31) have through holes at opposite ends. A sealing ring (36) is provided between a pair of through holes. The outer wall of the sealing ring (36) is fixedly connected to the inner wall of the through hole, and the inner wall of the sealing ring (36) is tightly fitted to the outer wall of the connecting rod (34).
4. The micro-volume vacuum blood collection device according to claim 1, characterized in that, The plug sleeve (22) has an internal rubber ring (23) installed inside, and the blood collection needle assembly (1) includes a connector (11) which is inserted into the internal rubber ring (23).
5. The micro-volume vacuum blood collection device according to claim 4, characterized in that, The connector (11) has a flexible tube (12) connected to one end away from the vacuum blood collection tube (21), and a needle holder (13) connected to the other end away from the connector (11). A needle (14) is installed on the upper end of the needle holder (13).
6. The micro-volume vacuum blood collection device according to claim 5, characterized in that, The needle seat (13) is fitted with a sleeve (15), the inner wall of the sleeve (15) is fixedly connected to the outer wall of the needle seat (13), and a protective cover (16) is threaded on the upper part of the sleeve (15), and a protective gasket (17) is installed on the inner top of the protective cover (16).
7. The micro-volume vacuum blood collection device according to claim 3, characterized in that, Both the vacuum blood collection tube (21) and the regulating cylinder (31) are transparent, and the outer wall of the vacuum blood collection tube (21) is provided with scale lines.