A rotary trigger-type peripheral blood quantitative collection and transfer device

Abstract

This invention provides a rotary-triggered peripheral blood quantitative collection and transfer device, comprising: a housing assembly including a front housing, a middle housing, and a rear housing detachably connected to each other; a puncture unit for puncturing the skin at the peripheral site and disposed on the front housing; a quantitative collection module fixed within the middle housing, including a U-shaped capillary with a hydrophilic inner wall; and a vacuum collection tube fixedly disposed within the rear housing, the vacuum collection tube having a preset negative pressure, and a sealing plug at its end facing the tip of the transfer needle. This invention can precisely control the advancement of the vacuum collection tube towards the fixed transfer needle, achieving reliable puncture of the sealing plug. After puncture, the device uses the preset negative pressure of the vacuum collection tube as a power source to directly draw a quantitative amount of blood from the U-shaped capillary into the collection tube.

Description

Technical Field

[0001] This invention relates to the field of peripheral blood collection technology, specifically a rotary trigger-type peripheral blood quantitative collection and transfer device. Background Technology

[0002] With the rapid development of precision medicine, remote health monitoring, and chronic disease management, the demand for home-based blood collection for blood routine tests, blood glucose tests, and genetic testing is increasing. Peripheral blood collection (such as finger prick blood) has become the main method for outpatient and home-based blood collection due to its advantages of minimal trauma and low pain. Existing home or on-site blood collection methods are mainly divided into two categories, but both have technical limitations: The first type is the traditional method of separating the lancet and capillary blood collection tube. This method requires the user to manually hold the capillary tube and aim it at the bleeding point after puncturing with the lancet. This process is not only cumbersome and requires a high degree of hand stability from the user, but it is also very easy to cause inaccurate blood volume control. In addition, the open collection process makes the blood sample easily exposed to the air, increasing the risk of sample contamination.

[0003] The second category consists of integrated micro-volume blood collection tubes that have recently appeared on the market. While these devices have improved in terms of integration, the transfer of blood inside them often relies on passive siphoning or manual pressure by the user. These transfer methods often cannot provide stable and powerful force, leading to problems such as inaccurate blood volume collection, the generation of air bubbles or residues during the transfer process, and insufficient mixing of blood with the anticoagulant inside the tube. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned shortcomings of the prior art and provide a rotary trigger-type peripheral blood quantitative collection and transfer device that is simple to operate and provides accurate blood volume.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A rotary-triggered peripheral blood quantitative collection and transfer device includes: The housing assembly includes a front housing, a middle housing, and a rear housing that are detachably connected to each other; A puncture unit, which is used to puncture the skin at the distal end and is disposed on the front housing; A quantitative collection module, fixed inside the middle shell, includes a U-shaped capillary with a hydrophilic inner wall; one end of the U-shaped capillary is connected to an aspiration part for contacting blood; the bottom end of the U-shaped capillary is provided with a blood outlet, which is connected to a transfer needle fixedly mounted on the middle shell via a flexible tube. A vacuum collection tube is fixedly installed inside the rear housing. The vacuum collection tube has a preset negative pressure, and the sealing plug at its end is directly opposite the tip of the transfer needle. When the rear housing rotates relative to the middle housing, the threads between the two drive the rear housing and the vacuum collection tube fixed therein to move axially toward the middle housing, causing the transfer needle to pierce the sealing plug, thereby allowing the U-shaped capillary to communicate with the internal space of the vacuum collection tube through the flexible tube and the transfer needle.

[0006] Preferably, it also includes a protective cover, which is detachably disposed at the front end of the front housing to cover the puncture unit.

[0007] Preferably, the outer wall of the rear housing is provided with threads that are compatible with the protective cover; after blood collection is completed and the middle housing and the rear housing are separated, the protective cover can be closed and fixed at the opening of the rear housing to seal the rear housing.

[0008] Preferably, the volume of the U-shaped capillary is 150 μL ± 10 μL.

[0009] Preferably, the middle shell is provided with a transparent observation window corresponding to the highest point of the U-shaped capillary, so that the user can intuitively judge whether the blood has filled the rated volume of the U-shaped capillary.

[0010] Preferably, the end of the inhalation section is shaped like an outwardly expanding funnel or a trumpet to guide blood into the U-shaped capillary.

[0011] Preferably, a pressure balancing port is also provided on the side wall of the middle shell, and the pressure balancing port is connected to the interior of the middle shell.

[0012] The beneficial effects of this invention are as follows: This invention employs a three-section structure consisting of a front shell, a middle shell, and a rear shell, achieving mechanical isolation between the puncture, quantification, and transfer functions. The front shell secures the puncture unit, while the middle shell secures the U-shaped capillary and transfer needle. During the blood transfer triggering phase, the rear shell undergoes axial displacement, while there is no relative movement between the transfer needle and the U-shaped capillary fixed within the middle shell. This design effectively prevents the axial tensile or torsional stress generated by mechanical transmission during transfer triggering from being transmitted to the fragile capillary components, reducing the damage rate of internal components and improving the overall reliability of the product.

[0013] This invention utilizes the thread between the middle and rear housings to convert the rotational motion of the rear housing into the axial linear motion of its internal vacuum collection tube. This transmission method provides stable force and allows for precise control of the vacuum collection tube's advancement towards the fixed transfer needle, ensuring reliable puncture of the sealing plug. After puncture, the device uses the preset negative pressure of the vacuum collection tube as a power source to directly draw a fixed amount of blood from the U-shaped capillary into the collection tube. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a cross-sectional view of an embodiment of the present invention; Figure 2 This is a schematic diagram of the usage process according to an embodiment of the present invention; Figure 3 This is a cross-sectional view of the shell in one embodiment of the present invention; Figure 4 This is a cross-sectional view of the rear housing in one embodiment of the present invention.

[0016] Explanation of reference numerals in the attached figures: 10-Front shell; 11-Protective cover; 12-Puncture unit; 20-Middle shell; 21-U-shaped capillary; 22-Inhalation part; 23-Observation window; 24-Pressure balance port; 25-Transfer needle; 26-Soft tube; 30-Rear shell; 31-Vacuum collection tube; 32-Sealing plug. Detailed Implementation

[0017] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this patent. To better illustrate this embodiment, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product.

[0018] It will be understood by those skilled in the art that certain well-known structures and their descriptions may be omitted in the accompanying drawings. The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] like Figures 1 to 4 As shown, this embodiment provides a rotary triggering peripheral blood quantitative collection and transfer device, which includes a front housing 10, a middle housing 20 and a rear housing 30 arranged coaxially in sequence.

[0020] A puncture unit 12 (such as a commercially available spring-driven safety lancet) is fixedly installed inside the front end of the front housing 10. The puncture unit 12 is used to quickly puncture the skin of the distal part (such as the fingertip) and automatically retract to prevent secondary injury caused by needle protrusion.

[0021] To ensure sterility before use and to prevent accidental contact, the device also includes a protective cover 11. In the initial state, the protective cover 11 is detachably fitted, snapped, or threaded onto the front end of the front housing 10, completely sealing the puncture unit 12 and the blood collection port.

[0022] Specifically, in this embodiment, a threaded structure adapted to the interior of the protective cover 11 is machined on the front outer wall of the rear housing 30. After the user completes blood collection, the rear housing 30 can be separated from the middle housing 20, and the protective cover 11 can be directly closed and fixed to the opening of the rear housing 30 to seal it. This design allows the separated rear housing 30 to be transformed into an independent and sealed protective transport container. On the one hand, it effectively prevents the vacuum collection tube 31, which is filled with blood samples, from accidentally slipping or being physically damaged during transport to the laboratory; on the other hand, it provides additional biosafety protection for the blood sample, reducing the risk of sample leakage or cross-contamination.

[0023] The middle housing 20 is fixedly connected to the front housing 10 by threads or snaps. A quantitative acquisition module is fixed inside the middle housing 20.

[0024] The quantitative acquisition module mainly consists of a U-shaped capillary tube 21 made of glass, with an internal volume of 150μL±10μL. To overcome the fluid resistance under the small pore size, the inner wall of the U-shaped capillary tube 21 is treated with plasma hydrophilic treatment, giving it extremely strong capillary adsorption force.

[0025] One end (liquid inlet end) of the U-shaped capillary 21 extends outward and is connected to a suction section 22. The end of the suction section 22 is finely designed as an outwardly expanding funnel or trumpet shape. When the trumpet shape contacts the blood droplet on the fingertip, it can quickly break the surface tension of the droplet and guide the blood smoothly into the U-shaped capillary 21.

[0026] To ensure a smooth blood suction process, a pressure balance port 24 is specially provided on the side wall of the middle shell 20. This pressure balance port 24 is connected to the cavity inside the middle shell 20 and around the U-shaped capillary 21. When blood is continuously filled into the U-shaped capillary 21 under the action of capillary force, the air originally in the tube can be discharged to the outside without obstruction through the needle gap and the pressure balance port 24, thus avoiding the occurrence of "air resistance".

[0027] Meanwhile, a transparent observation window 23 is provided on the side wall of the middle shell 20, which is precisely positioned at the highest point of the U-shaped capillary 21. The user can observe the blood level reaching this point through this window and thus visually confirm that the rated blood volume of 150μL has been collected.

[0028] In addition, a hollow transfer needle 25 with a sharp bevel is fixedly installed at the bottom of the inner shell 20. The bottom end of the U-shaped capillary 21 (i.e., the blood outlet) is connected to the tail end of the transfer needle 25 through a short medical-grade flexible tube 26 (such as a silicone tube) to form a closed fluid communication.

[0029] The rear housing 30 is connected to the middle housing 20 by threads. The rear housing 30 forms a receiving cavity, in which a standard-sized vacuum collection tube 31 (such as a microcentrifuge tube pre-filled with EDTA anticoagulant) is fixedly installed. The vacuum collection tube 31 has a factory-preset precise quantitative negative pressure, and its opening is sealed by a rubber sealing plug 32.

[0030] In the initial "non-triggered state", the rear housing 30 is in the initial engagement position of the thread. At this time, a safety gap of about 1 to 2 mm is maintained between the sealing plug 32 of the vacuum collection tube 31 fixed inside the rear housing 30 and the tip of the transfer needle 25 fixed on the middle housing 20.

[0031] The specific operation procedure of the device in this embodiment is as follows: Step 1: The user first removes the protective cover 11 that is fitted onto the front end of the front housing 10. The front end of the front housing 10 is then vertically aligned with the disinfected distal blood collection site (such as the skin of the fingertip), triggering the puncture unit 12 inside the front housing 10, which causes the blood collection needle inside to quickly pierce the skin and automatically retract, thus completing the creation of a minimally invasive blood collection wound.

[0032] Step Two: After the puncture is completed, the user unscrews the front housing 10 from the middle housing 20, removes and discards the used front housing 10 (which contains the contaminated puncture unit 12). At this time, the suction part 22, which is fixed to the front end of the middle housing 20 and is funnel-shaped or trumpet-shaped, is fully exposed and enters the collection state.

[0033] Step 3: The user holds the middle housing 20 and the rear housing 30, bringing the exposed suction part 22 at the front end of the middle housing 20 close to the blood droplet overflowing from the fingertip. Under the capillary force of the hydrophilic inner wall of the U-shaped capillary 21, the blood is smoothly and automatically drawn into the tube. During the blood suction process, the air originally inside the U-shaped capillary 21 is smoothly discharged to the outside through the air pressure balance port 24 opened on the side wall of the middle housing 20, completely avoiding air resistance in the microfluidic process. The user observes the transparent observation window 23 on the middle housing 20. When the blood level reaches the highest point of the U-shaped capillary 21 and is clearly displayed in the observation window 23, it indicates that the rated 150μL of blood has been accurately collected, and the device is then removed.

[0034] Step Four: After the quantification is completed, the user holds the middle housing 20 with one hand and rotates the rear housing 30 in the direction marked on the outer housing with the other hand. The rear housing 30 rotates relative to the middle housing 20, and the threaded engagement between the two smoothly converts the user's rotational motion into the axial linear motion of the rear housing 30. This motion drives the rear housing 30 and the vacuum collection tube 31 fixed inside it to steadily move towards the middle housing 20.

[0035] Step 5: As the vacuum collection tube 31 advances, the transfer needle 25, fixed within the inner housing 20, shifts relative to the vacuum collection tube 31, and the tip of the transfer needle 25 smoothly and forcefully pierces the sealing plug 32 at the end of the vacuum collection tube 31. At the moment of piercing, the preset negative pressure within the vacuum collection tube 31 is rapidly transmitted through the transfer needle 25 and the internal flexible tube 26 to the blood outlet of the U-shaped capillary 21. Under the powerful pressure differential, a fixed amount of blood is drawn into the vacuum collection tube 31 and mixes with the anticoagulant pre-placed at the bottom of the tube. Throughout the transfer process, because both the transfer needle 25 and the U-shaped capillary 21 are fixed within the same housing, there is no relative pulling between them, ensuring the absolute safety of the internal flow channel structure.

[0036] Step Six: After the blood transfer is complete, the user rotates the rear housing 30 in the opposite direction to completely separate it from the middle housing 20. The user then retrieves the protective cap 11 removed in step one and screws it directly onto the threads at the front opening of the rear housing 30. At this point, the rear housing 30 is transformed into an independent and shock-resistant transport protective shell, internally enclosing the vacuum collection tube 31 filled with the blood sample. The user can safely ship this sealed assembly directly to the laboratory for automated testing, while the remaining middle housing 20 assembly is safely disposed of as medical waste.

[0037] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A rotary-triggered peripheral blood quantitative collection and transfer device, characterized in that, include: The housing assembly includes a front housing, a middle housing, and a rear housing that are detachably connected to each other; A puncture unit, which is used to puncture the skin at the distal end and is disposed on the front housing; A quantitative collection module, fixed inside the middle shell, includes a U-shaped capillary with a hydrophilic inner wall; one end of the U-shaped capillary is connected to an aspiration part for contacting blood; the bottom end of the U-shaped capillary is provided with a blood outlet, which is connected to a transfer needle fixedly mounted on the middle shell via a flexible tube. A vacuum collection tube is fixedly installed inside the rear housing. The vacuum collection tube has a preset negative pressure, and the sealing plug at its end is directly opposite the tip of the transfer needle. When the rear housing rotates relative to the middle housing, the threads between the two drive the rear housing and the vacuum collection tube fixed therein to move axially toward the middle housing, causing the transfer needle to pierce the sealing plug, thereby allowing the U-shaped capillary to communicate with the internal space of the vacuum collection tube through the flexible tube and the transfer needle.

2. The rotary trigger-type peripheral blood quantitative collection and transfer device according to claim 1, characterized in that, It also includes a protective cover, which is detachably disposed at the front end of the front housing to cover the puncture unit.

3. The rotary trigger-type peripheral blood quantitative collection and transfer device according to claim 2, characterized in that, The outer wall of the rear housing is provided with threads that are compatible with the protective cover; after blood collection is completed and the middle housing and the rear housing are separated, the protective cover can be closed and fixed at the opening of the rear housing to seal the rear housing.

4. The rotary trigger-type peripheral blood quantitative collection and transfer device according to claim 1, characterized in that, The volume of the U-shaped capillary is 150 μL ± 10 μL.

5. The rotary-triggered peripheral blood quantitative collection and transfer device according to claim 1, characterized in that, The inner shell is provided with a transparent observation window corresponding to the highest point of the U-shaped capillary, so that the user can intuitively judge whether the blood has filled the rated volume of the U-shaped capillary.

6. The rotary-triggered peripheral blood quantitative collection and transfer device according to claim 1, characterized in that, The end of the inhalation section is shaped like an outwardly expanding funnel or trumpet to guide blood into the U-shaped capillary.

7. The rotary trigger-type peripheral blood quantitative collection and transfer device according to claim 1, characterized in that, The middle shell is also provided with a pressure balance port on its side wall, and the pressure balance port is connected to the inside of the middle shell.

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