A fingertip blood vessel detector

Abstract

This application relates to a fingertip vascular detector, specifically in the field of medical devices. The fingertip vascular detector includes a base, a detection container, a first air bladder, and a detection element. The detection container has a detection cavity with one open end for inserting a finger into it. The first air bladder is spirally arranged around the detection cavity and extends from the opening of the detection container to the bottom of the cavity. The air nozzle of the first air bladder is positioned near the opening of the detection cavity. The detection element is disposed at the bottom of the detection cavity and is used to collect blood flow signals from the fingertip. In this embodiment, the fingertip vascular detector includes a base, a detection container, a first air bladder, and a detection element. The first air bladder is spirally arranged around the detection cavity. When the air nozzle of the first air bladder is inflated, the first air bladder expands spirally from the opening to the bottom of the cavity, achieving uniform pressure on the finger, ensuring complete blood drainage, and reducing residual interference.

Description

Technical Field

[0001] This invention relates to the field of medical devices, specifically to a fingertip blood vessel detector. Background Technology

[0002] In the process of vascular function assessment and disease diagnosis, fingertip vascular detection technology provides important basis for clinical decision-making by accurately obtaining key parameters such as blood flow return velocity and vascular elasticity index.

[0003] Traditional fingertip vascular detectors typically employ a cylindrical air bladder structure, which easily creates irregular protrusions in localized areas of the fingertip, resulting in an uneven distribution of pressure along the circumference of the fingertip. This uneven pressure prevents the complete drainage of blood from inside the finger, and the residual blood generates continuous interference signals during subsequent reflux, causing data distortion and affecting the reliability of vascular function assessment. Summary of the Invention

[0004] This application provides a fingertip blood vessel detector that can solve the problem of insufficient pressure uniformity in the prior art.

[0005] In a first aspect, embodiments of this application provide a fingertip blood vessel detector, comprising: Base; A detection container has a detection cavity with an opening at one end, the opening being for inserting a finger into the detection cavity; A first airbag is spirally arranged around the detection cavity and extends from the opening of the detection container to the bottom of the cavity, with the air nozzle of the first airbag positioned close to the opening of the detection cavity. The detection element is located at the bottom of the detection cavity and is used to collect blood flow signals from the fingertip.

[0006] In conjunction with the first aspect, in one embodiment, the first airbag is disposed on the inner sidewall of the detection cavity.

[0007] In conjunction with the first aspect, in one embodiment, the fingertip blood vessel detector further includes an inner cylinder disposed in the detection cavity, the inner cylinder being flexibly disposed; The first airbag is disposed between the inner wall of the detection cavity and the outer wall of the inner cylinder.

[0008] In conjunction with the first aspect, in one embodiment, the detection container includes a base and an outer cylinder, the base and the outer cylinder enclosing to form the detection cavity; The outer cylinder is flexibly configured, and the first airbag is disposed between the outer cylinder and the inner cylinder.

[0009] In conjunction with the first aspect, in one embodiment, the fingertip blood vessel detector further includes a pressure control structure disposed on the base, the pressure control structure being used to inflate and deflate the first airbag.

[0010] In conjunction with the first aspect, in one embodiment, the pressure control structure includes: A piston cylinder is disposed on the base, and one end of the piston cylinder is provided with a vent hole communicating with the air nozzle of the first airbag; Piston component, movably disposed within the piston cylinder; and, A driving component is connected to the piston component to drive the piston component to move within the piston cylinder.

[0011] In conjunction with the first aspect, in one embodiment, the fingertip blood vessel detector further includes a backflow barrier structure disposed at the opening of the detection cavity, the backflow barrier structure being used to squeeze the base of the finger.

[0012] In conjunction with the first aspect, in one embodiment, the backflow barrier structure includes a second airbag disposed at the opening of the detection cavity, the second airbag being arranged in a ring shape.

[0013] In conjunction with the first aspect, in one embodiment, the fingertip blood vessel detector further includes a clamping assembly, the clamping assembly including two arc-shaped clamps disposed opposite to each other outside the detection container, the two arc-shaped clamps being movable relative to each other or opposite to each other.

[0014] In conjunction with the first aspect, in one embodiment, the clamping assembly further includes a bidirectional lead screw, which is threadedly connected to the two arc-shaped clamping plates respectively.

[0015] The beneficial effects of the technical solutions provided in this application include: In the technical solution of this embodiment, the fingertip blood vessel detector includes a base, a detection container, a first airbag, and a detection element. The first airbag is spirally arranged around the detection cavity. When the air nozzle of the first airbag is inflated, the first airbag expands from the opening to the bottom of the cavity along the spiral, so as to achieve uniform pressure on the finger, ensure that the blood is completely discharged, and reduce residual interference. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1This is a three-dimensional structural schematic diagram of an embodiment of the fingertip blood vessel detector provided by the present invention; Figure 2 for Figure 1 A three-dimensional structural diagram of the middle finger tip blood vessel detector from another angle; Figure 3 for Figure 1 A three-dimensional exploded view of the middle finger vascular detector; Figure 4 for Figure 3 Enlarged diagram of part A in the diagram; Figure 5 for Figure 1 A schematic diagram of the medium-pressure control structure.

[0018] In the diagram: 1. Base; 2. Detection container; 21. Base; 22. Outer cylinder; 201. Detection cavity; 3. First airbag; 4. Detection component; 5. Inner cylinder; 6. Air pressure control structure; 61. Piston cylinder; 62. Piston component; 63. Drive component; 7. Second airbag; 8. Clamping assembly; 81. Arc-shaped clamping plate; 82. Bidirectional lead screw. Detailed Implementation

[0019] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0020] In the process of vascular function assessment and disease diagnosis, fingertip vascular detection technology provides important basis for clinical decision-making by accurately obtaining key parameters such as blood flow return velocity and vascular elasticity index.

[0021] Traditional fingertip vascular detectors typically employ a cylindrical air bladder structure, which easily creates irregular protrusions in localized areas of the fingertip, resulting in an uneven distribution of pressure along the circumference of the fingertip. This uneven pressure prevents the complete drainage of blood from inside the finger, and the residual blood generates continuous interference signals during subsequent reflux, causing data distortion and affecting the reliability of vascular function assessment.

[0022] To address the aforementioned problems, this invention proposes a fingertip blood vessel detector, which can solve the problem of insufficient pressure uniformity in the prior art.

[0023] Please refer to Figures 1 to 4This invention proposes a fingertip blood vessel detector, comprising a base 1, a detection container 2, a first air bladder 3, and a detection element 4. The detection container 2 has a detection cavity 201 with one end open, the opening for inserting a finger into the detection cavity 201. The first air bladder 3 is spirally arranged around the detection cavity 201 and extends from the opening of the detection container 2 to the bottom of the cavity, with the air nozzle of the first air bladder 3 positioned close to the opening of the detection cavity 201. The detection element 4 is disposed at the bottom of the detection cavity 201 and is used to collect fingertip blood flow signals.

[0024] In the technical solution of this embodiment, the fingertip blood vessel detector includes a base 1, a detection container 2, a first airbag 3, and a detection element 4. The first airbag 3 is spirally arranged around the detection cavity 201. When air is inflated into the air nozzle of the first airbag 3, the first airbag 3 expands from the opening to the bottom of the cavity along the spiral, so as to achieve uniform pressure on the finger, ensure that blood is completely discharged, and reduce residual interference.

[0025] The detection element 4 is positioned at the bottom of the detection cavity 201. The function of the detection element 4 is to acquire blood flow signals from the fingertip. For example, the detection element 4 can be a photoelectric sensor that detects changes in blood volume at the fingertip by emitting light of a specific wavelength and receiving reflected or transmitted light, thereby deriving the blood flow signal. The detection element 4 can also be a piezoelectric sensor that acquires blood flow information by detecting pressure fluctuations caused by the fingertip pulse. The detection element 4 can be fixed to the bottom of the cavity or connected to the bottom of the cavity via an elastic support structure to ensure good contact with the fingertip.

[0026] The first airbag 3 can be made of various elastic materials, such as medical-grade silicone, natural rubber, or TPU, which have good biocompatibility and elastic recovery capabilities. The first airbag 3 forms one or more sealed cavities, which can be inflated or deflated by an external air source. The first airbag 3 is spirally arranged around the detection cavity 201. This spiral layout allows the first airbag 3 to generate a continuous and gradual squeezing action along the axial direction of the finger when inflated. This squeezing method can simulate the natural contraction process of human blood vessels, effectively promoting blood flow to the fingertip. The spiral arrangement can be achieved by pre-forming the first airbag 3 into a spiral tubular structure and then fixing it to the inner wall of the detection cavity 201; or, the detection cavity 201 can be pre-designed with spiral guide grooves or recesses to guide and accommodate the first airbag 3, maintaining its spiral shape during inflation. The air nozzle of the first airbag 3 is located near the opening of the detection cavity 201. The air nozzle is the interface connecting the first airbag 3 to the external air pressure control system, used for introducing or expelling gas.

[0027] Based on the aforementioned fingertip vascular detector, this application's solution, when the user inserts their finger into the detection cavity 201, inflates the nozzle of the first airbag 3 via an external air pressure control system. Because the nozzle is positioned close to the opening of the detection cavity 201, the gas first enters the portion of the first airbag 3 near the opening and gradually inflates towards the bottom of the cavity along a spiral path. This spiral inflation allows the first airbag 3 to exert a progressive compression on the finger inserted into the detection cavity 201 from the opening towards the bottom. As the air pressure continues to increase, the compression effect is gradually transmitted from the base of the finger to the fingertip, effectively pushing the blood flow at the fingertip towards the location of the detection element 4. This airbag-based compression method provides a gentler, more uniform pressure distribution and better adapts to different finger shapes and sizes, avoiding localized overpressure. Simultaneously, by precisely controlling the inflation pressure and speed of the airbag, fine control of the compression process can be achieved, ensuring the stability and accuracy of blood flow signal acquisition.

[0028] The first airbag 3 can be disposed on the inner side wall of the detection cavity 201 or on the outer side wall.

[0029] Understandably, if the first airbag 3 is located on the outer wall, the force exerted by the first airbag 3 on the finger will be very small. This would require an additional constraint structure to ensure that the first airbag 3 compresses the finger as much as possible. Therefore, in this embodiment, the first airbag 3 is located on the inner wall of the detection cavity 201. This allows the side wall of the detection container 2 to serve as a constraint structure for the first airbag 3, eliminating the need for additional constraints and ensuring the effective compression of the finger.

[0030] In practical applications, the first airbag 3 coming into direct contact with the fingers can easily lead to excessive local pressure, resulting in uneven compression.

[0031] Please refer to the following for details. Figure 3 and Figure 4 This application further proposes that the above-mentioned fingertip blood vessel detector also includes an inner cylinder 5 disposed in the detection cavity 201, the inner cylinder 5 being flexibly disposed; the first airbag 3 is disposed between the inner sidewall of the detection cavity 201 and the outer sidewall of the inner cylinder 5.

[0032] The inner cylinder 5 is a tubular structure with an internal channel for finger insertion. The inner cylinder 5 can be made of various materials, such as medical-grade silicone or latex, which possess good biocompatibility, elasticity, and wear resistance to ensure safety and comfort in contact with the human body. The inner cylinder 5 is flexible, meaning it has a certain degree of deformability or elasticity. Specifically, the first airbag 3 is housed within the annular space formed by the inner wall of the detection cavity 201 and the outer wall of the inner cylinder 5. This arrangement allows the first airbag 3 to transmit pressure to the finger through the flexible inner cylinder 5 when inflated, while simultaneously effectively isolating the first airbag 3 from the finger.

[0033] The solution of this application involves setting a flexible inner cylinder 5 within the detection cavity 201, and arranging the first airbag 3 between the inner wall of the detection cavity 201 and the outer wall of the inner cylinder 5. This allows the squeezing action of the first airbag 3, when inflated, to be transmitted to the finger through the flexible inner cylinder 5. The flexible inner cylinder 5 can adapt to different finger sizes and shapes, ensuring a uniform distribution of squeezing force. Simultaneously, the inner cylinder 5 acts as an isolation layer between the first airbag 3 and the finger, effectively protecting the first airbag 3 from direct contact and abrasion, and providing a smooth and hygienic surface for finger insertion. When the first airbag 3 is gradually squeezed from the opening of the detection cavity 201 towards the bottom in a spiral manner, the flexible inner cylinder 5 deforms accordingly, smoothly applying this gradual squeezing action to the finger, thereby achieving effective acquisition of blood flow signals at the fingertip. This structural combination ensures the stability and comfort of the squeezing process.

[0034] How the structure of the testing container 2 can effectively support and cooperate with the expansion of the first airbag 3, while ensuring the effective transmission and uniformity of the extrusion force, is a technical problem that needs to be further clarified and optimized.

[0035] In this regard, this application further proposes that the detection container 2 includes a base 21 and an outer cylinder 22, the base 21 and the outer cylinder 22 enclosing each other to form the detection cavity 201; the outer cylinder 22 is flexibly configured, and the first airbag 3 is disposed between the outer cylinder 22 and the inner cylinder 5.

[0036] Specifically, the base 21 refers to the bottom structure of the detection container 2, which typically supports the entire detection container 2 and may be connected to the base 1. The outer cylinder 22 refers to the side wall structure of the detection container 2, which, together with the base 21, constitutes the main body of the detection cavity 201. The outer cylinder 22 is usually cylindrical, and its inner wall fits with the inner cylinder 5 and the first airbag 3. For example, the outer cylinder 22 can be a cylindrical or conical tubular structure made of materials such as plastic, silicone, or rubber, and its shape and size must match those of the inner cylinder 5 and the first airbag 3. The base 21 and the outer cylinder 22 are connected by means of threaded connection, snap-fit ​​connection, bonding, or integral molding to form a closed cavity, which together defines the internal space for the finger to be inserted, ensuring the integrity and sealing of the detection cavity 201 and providing a controlled detection environment for the finger. The outer cylinder 22 is flexible, meaning that the outer cylinder 22 has a certain degree of deformability or elasticity, and can deform under external force and return to its original shape after the external force is removed.

[0037] When the air pressure control structure 6 inflates the first airbag 3, the flexibility of the outer cylinder 22 allows the first airbag 3 to effectively apply pressure to the inner cylinder 5 during expansion. The flexible inner cylinder 5, after being compressed by the first airbag 3, deforms inwards towards the detection cavity 201, thus applying uniform and gradual compression to the finger. This structural layout allows the expansion force of the first airbag 3 to be transmitted layer by layer through the flexible outer cylinder 22 and the flexible inner cylinder 5, achieving effective compression of the fingertip blood vessels. The flexible outer cylinder 22 not only provides external support and constraint for the first airbag 3, preventing excessive outward expansion, but more importantly, its flexibility allows the first airbag 3 to effectively expand inwards during inflation, ensuring the effectiveness and controllability of the compression action. This design optimizes the transmission path of the compression force, making the compression process smoother and more efficient, thereby creating stable physiological conditions for the detection element 4 to collect fingertip blood flow signals.

[0038] In some embodiments described above in this application, a fingertip blood vessel detector is proposed, in which a first air bladder 3 is spirally arranged around the detection cavity 201, and the air nozzle of the first air bladder 3 is positioned close to the opening of the detection cavity 201 for squeezing the finger. However, in practical applications, how to accurately and effectively control the inflation and deflation process of the first air bladder 3 to achieve stable and controllable squeezing of the fingertip blood vessels is a problem that needs to be solved.

[0039] In this regard, this application further proposes that the aforementioned fingertip blood vessel detector also includes a pneumatic control structure 6 disposed on the base 1, which is used to inflate and deflate the first airbag 3.

[0040] Specifically, the air pressure control structure 6 is a device for regulating and controlling gas pressure. Its core function is to achieve precise inflation and deflation of the first airbag 3. This structure may include, but is not limited to, components such as an air pump, valve, pressure sensor, and controller to ensure that the first airbag 3 can expand and contract according to a preset pressure curve or time sequence. The air pressure control structure 6 is mounted on the base 1, which makes the entire detector structure compact, stable, and easy to integrate and operate. By inflating the first airbag 3, it can expand and apply pressure to the finger, thereby compressing the blood vessels at the fingertip; by deflation, the pressure can be released, allowing the finger to return to its normal state.

[0041] The solution of this application forms a controllable compression system by setting a pneumatic control structure 6 on the base 1 and connecting it to the first airbag 3. When compression of the fingertip is required, the pneumatic control structure 6 inflates the first airbag 3, causing it to expand and apply uniform and controllable pressure to the finger along the circumference and axial direction of the detection cavity 201, achieving gradual compression from the opening of the detection cavity 201 towards the bottom. When compression needs to be released, the pneumatic control structure 6 deflates the first airbag 3, causing it to contract and releasing the pressure on the finger. This design allows for precise control of the compression process of the fingertip blood vessels, such as controlling the intensity, speed, and duration of the compression, thus ensuring the acquisition of stable fingertip blood flow signals. Compared with solutions that only have the first airbag 3 without precise control, this pneumatic control structure 6 makes the compression process more standardized and repeatable, avoiding inconsistencies that may arise from manual operation.

[0042] For one specific implementation method, please refer to Figure 5 The pneumatic control structure 6 includes a piston cylinder 61, a piston member 62, and a drive member 63. The piston cylinder 61 is mounted on the base 1, and one end of it has a vent hole that communicates with the air nozzle of the first airbag 3. The piston member 62 is movably mounted inside the piston cylinder 61. The drive member 63 is drivenly connected to the piston member 62 to drive the piston member 62 to move within the piston cylinder 61.

[0043] The driving component 63 is a device capable of generating mechanical force or motion and transmitting it to the piston component 62, thereby driving the piston component 62 to perform a predetermined movement within the piston cylinder 61. The driving component 63 can take various forms; for example, it can be an electric motor driving the piston component 62 via a lead screw and nut mechanism, or it can be a stepper motor directly driving the piston component 62. A vent is a channel located at one end of the piston cylinder 61, used for gas to enter and exit the inner cavity of the piston cylinder 61. It connects the gas inside the piston cylinder 61 with the external gas path. The vent can be a simple circular hole or a threaded interface for connecting a gas pipe or nozzle. Its size and shape should ensure smooth gas passage while guaranteeing the reliability and airtightness of the connection.

[0044] This application provides a mechanical pneumatic pressure regulation system by specifying the pneumatic control structure 6 as a combination of a piston cylinder 61, a piston member 62, and a drive member 63. The piston cylinder 61 forms a sealed cavity in which the piston member 62 moves axially. The drive member 63 is mechanically connected to the piston member 62, enabling precise control of the piston member 62's displacement within the piston cylinder 61. One end of the piston cylinder 61 has a vent hole, which directly communicates with the air nozzle of the first airbag 3. When the drive member 63 drives the piston member 62 towards the vent hole, the cavity volume between the piston member 62 and the vent hole in the piston cylinder 61 decreases, compressing the air within the cavity and forcing it to enter the first airbag 3 through the vent hole, thereby inflating the first airbag 3 and applying pressure to the finger. Conversely, when the drive member 63 drives the piston member 62 away from the vent hole, the cavity volume increases, drawing air out of the first airbag 3, causing the first airbag 3 to deflate and release pressure on the finger.

[0045] Understandably, when the first airbag 3 squeezes the finger to push blood toward the fingertip, blood at the base of the finger may flow back, which may weaken the squeezing effect and affect the accuracy and effectiveness of the fingertip blood flow signal acquisition.

[0046] In this regard, this application further proposes that the aforementioned fingertip blood vessel detector also includes a backflow barrier structure disposed in the opening of the detection cavity 201, the backflow barrier structure being used to squeeze the base of the finger.

[0047] The backflow barrier structure is a device used to apply pressure to the base of the finger after the finger is inserted into the detection cavity 201, thereby preventing or limiting the backflow of blood to the base of the finger. Its function is to ensure that the squeezing effect of the first airbag 3 on the fingertip is more concentrated in the fingertip direction, reducing the interference of blood backflow on the detection results, and thus improving the accuracy of blood flow signal acquisition. This structure can be implemented in various forms; for example, it can be a mechanically retractable ring clamp that tightens after the finger is inserted via a mechanical linkage mechanism; or it can be an inflatable ring airbag that is inflated and deflated by a pneumatic control system to achieve squeezing of the base of the finger. The backflow barrier structure is located at the opening of the detection cavity 201, i.e., at the entrance of the detection cavity 201 of the detection container 2. By placing the backflow barrier structure here, it can act on the base of the finger immediately after the finger enters the detection cavity 201, effectively preventing blood from flowing back to the base of the finger during the squeezing process before or simultaneously with the first airbag 3 begins to work. The core function of this structure is to compress the base of the finger. By applying appropriate pressure to the base of the finger, this structure can create a localized blocking zone, preventing blood from easily flowing back to the base of the finger when the first air bladder 3 pushes blood towards the fingertip. This compression can be a uniform, circumferential pressure to avoid discomfort or damage to the base of the finger while ensuring an effective blood flow barrier.

[0048] In one specific embodiment, the aforementioned backflow barrier structure may include a second airbag 7 disposed at the opening of the detection cavity 201, the second airbag 7 being annularly arranged. When a finger is inserted into the detection cavity 201, the air pressure control system can inflate the second airbag 7, causing it to expand and surround and compress the base of the finger. The inflation pressure of the second airbag 7 can be adjusted as needed to provide sufficient barrier force while ensuring user comfort. After blood flow signal acquisition is completed, the second airbag 7 can deflate, allowing the finger to be easily removed from the detection cavity 201.

[0049] By incorporating a backflow barrier structure at the opening of the detection cavity 201 and using it to compress the base of the finger, this application effectively solves the technical problem of potential blood backflow during fingertip vascular detection. This structure ensures that the blood propelled by the first air bladder 3 flows primarily towards the fingertip, avoiding ineffective backflow during compression, thereby significantly improving the accuracy and reliability of fingertip blood flow signal acquisition. This allows the detection element 4 to operate in a more stable and controlled blood flow environment, further enhancing the overall performance and diagnostic accuracy of the fingertip vascular detector.

[0050] This application proposes a fingertip blood vessel detector, which collects fingertip blood flow signals by squeezing the finger with a first air bladder 3. However, in actual operation, due to the large differences in individual finger size and the possibility of finger displacement during squeezing, the finger's positioning within the detection cavity 201 is not stable enough, affecting the squeezing effect and the accuracy of blood flow signal acquisition.

[0051] Please refer to the following for details. Figure 2 and Figure 3 This application further proposes that the fingertip blood vessel detector also includes a clamping assembly 8, which includes two arc-shaped clamps 81 disposed opposite to each other outside the detection container 2, and the two arc-shaped clamps 81 can be movably disposed opposite to each other or back to back.

[0052] The clamping assembly 8 is designed to provide external support and fixation for the finger being examined. Possible implementation methods include, but are not limited to: employing a mechanical linkage mechanism to transmit and adjust the clamping force through components such as gears, linkages, or cams; or employing a pneumatic or hydraulic drive system to drive the clamping components to move through cylinders or hydraulic cylinders. The arc-shaped clamping plate 81 is the part of the clamping assembly 8 that directly contacts the finger. Its arc-shaped design is designed to better conform to the natural curvature of the finger, thereby increasing the contact area, dispersing clamping pressure, and improving clamping stability and comfort.

[0053] The solution of this application introduces a clamping component 8, which works synergistically with the core detection function of the fingertip blood vessel detector. When a finger is inserted into the detection cavity 201 of the detection container 2, the two arc-shaped clamps 81 of the clamping component 8 move relative to the inserted finger from outside the detection container 2, i.e., they move inward, thereby stably clamping the fingertip. This external clamping action can effectively fix the position of the finger within the detection cavity 201, preventing unnecessary shaking, rotation, or displacement during the subsequent compression operation of the first airbag 3. By ensuring the stable positioning of the finger, the first airbag 3 can more accurately and evenly apply gradual compression to the finger from the opening of the detection cavity 201 towards the bottom of the cavity, thereby ensuring the effectiveness and consistency of the compression process. At the same time, when the detection element 4 collects the blood flow signal of the fingertip at the bottom of the cavity, due to the stability of the finger, a clearer, more accurate, and less interfered blood flow signal can be obtained, significantly improving the reliability and repeatability of the detection results. The two arc-shaped clamps 81 can be moved relative to each other or back to back, so that the clamping assembly 8 can flexibly adapt to fingers of different thicknesses, thereby expanding the applicability of the device.

[0054] Specifically, the clamping assembly 8 also includes a bidirectional lead screw 82, which is threadedly connected to two arc-shaped clamping plates 81 respectively.

[0055] This application presents a precise and controllable clamping assembly 8 by introducing a bidirectional lead screw 82 and threading it to the arc-shaped clamping plates 81. When the bidirectional lead screw 82 rotates, its special thread design drives the two threaded arc-shaped clamping plates 81 to move synchronously in opposite or opposing directions at the same speed. This synchronous and symmetrical movement mechanism ensures that the arc-shaped clamping plates 81 remain centered when clamping or releasing the finger, avoiding finger misalignment or uneven force caused by unilateral or asynchronous movement. By controlling the rotation direction and angle of the bidirectional lead screw 82, the distance between the two arc-shaped clamping plates 81 can be precisely adjusted to accommodate fingers of different sizes and apply appropriate clamping force. This method makes the clamping operation more stable and reliable, significantly improving the accuracy and repeatability of the clamping position, and providing a stable basis for subsequent fingertip blood flow signal acquisition.

[0056] Of course, to improve the stability of the movement of the two arc-shaped clamping plates 81, a guide structure can be used for guidance. The guide structure can be set between the two arc-shaped clamping plates 81, for example, by opening guide holes on both arc-shaped clamping plates 81, and guiding the movement of the two arc-shaped clamping plates 81 by passing a guide rod through the two guide holes. Alternatively, it can be set between the arc-shaped clamping plates 81 and the base 1, for example, by guiding the movement of a slider groove.

[0057] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0058] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0059] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A fingertip blood vessel detector, characterized in that, include: Base; A detection container has a detection cavity with an opening at one end, the opening being for inserting a finger into the detection cavity; A first airbag is spirally arranged around the detection cavity and extends from the opening of the detection container to the bottom of the cavity, with the air nozzle of the first airbag positioned close to the opening of the detection cavity. The detection element is located at the bottom of the detection cavity and is used to collect blood flow signals from the fingertip.

2. The fingertip blood vessel detector as described in claim 1, characterized in that, The first airbag is disposed on the inner sidewall of the detection cavity.

3. The fingertip blood vessel detector as described in claim 2, characterized in that, The fingertip blood vessel detector also includes an inner cylinder disposed in the detection cavity, the inner cylinder being flexibly disposed; The first airbag is disposed between the inner wall of the detection cavity and the outer wall of the inner cylinder.

4. The fingertip blood vessel detector as described in claim 3, characterized in that, The detection container includes a base and an outer cylinder, the base and the outer cylinder forming the detection cavity; The outer cylinder is flexibly configured, and the first airbag is disposed between the outer cylinder and the inner cylinder.

5. The fingertip blood vessel detector as described in claim 2, characterized in that, The fingertip blood vessel detector also includes a pressure control structure disposed on the base, the pressure control structure being used to inflate and deflate the first airbag.

6. The fingertip blood vessel detector as described in claim 5, characterized in that, The pressure control structure includes: A piston cylinder is disposed on the base, and one end of the piston cylinder is provided with a vent hole communicating with the air nozzle of the first airbag; Piston component, movably disposed within the piston cylinder; and, A driving component is connected to the piston component to drive the piston component to move within the piston cylinder.

7. The fingertip blood vessel detector as described in claim 1, characterized in that, The fingertip vascular detector also includes a backflow barrier structure disposed at the opening of the detection cavity, the backflow barrier structure being used to squeeze the base of the finger.

8. The fingertip blood vessel detector as described in claim 7, characterized in that, The backflow barrier structure includes a second airbag disposed at the opening of the detection cavity, the second airbag being arranged in a ring shape.

9. The fingertip blood vessel detector as described in claim 1, characterized in that, The fingertip blood vessel detector also includes a clamping assembly, which includes two arc-shaped clamps disposed opposite to each other outside the detection container. The two arc-shaped clamps can be movably disposed opposite to each other or back to back.

10. The fingertip blood vessel detector as described in claim 9, characterized in that, The clamping assembly also includes a bidirectional lead screw, which is threadedly connected to the two arc-shaped clamping plates respectively.

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