Simple negative pressure bolt extraction device

Abstract

The utility model relates to medical instrument technical field discloses simple and easy negative pressure draws the bolt device for drawing the thrombus that forms newly and has not yet been organized in vein or artery, including needle cylinder and push -rod, push -rod slidingly arranged in needle cylinder, push -rod top extends into the lumen of needle cylinder, and the sealed contact is formed with needle cylinder inside, and push -rod tail is located needle cylinder outside, when push -rod is outwardly drawn vacuum to the maximum, when push -rod tail and needle cylinder tail distance reaches the maximum, push -rod tail and needle cylinder tail between the detachable support subassembly are connected, the support subassembly is used for keeping push -rod and needle cylinder are in the vacuum negative pressure maximum, needle cylinder tail end both sides horizontally extend out have the side wing for providing the support surface, the side wing is used for supporting the support subassembly, the side wing is equipped with the recess for clamping the support subassembly. The utility model can solve the technical problem that the negative pressure suction device structure is complicated, the cost is high in the prior art.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a simple negative pressure thrombectomy device. Background Technology

[0002] A thrombus is a solid mass formed by the coagulation of blood within the circulatory system or by certain formed elements in the blood. A thrombus consists of insoluble fibrin, deposited platelets, accumulated white blood cells, and trapped red blood cells. These components combine in a variable, fluid-dependent environment to form a thrombus. Once formed, a thrombus easily obstructs blood vessels, leading to tissue or organ embolism, which in turn causes hypoxia and the accumulation of metabolic waste. If this condition is not treated promptly, it can lead to serious health problems such as myocardial infarction, cerebral infarction, pulmonary embolism, and deep vein thrombosis in the lower extremities. To reduce the health risks caused by vascular obstruction, thrombi in blood vessels must be effectively removed, and negative pressure aspiration is required during the removal process.

[0003] However, currently used thrombectomy devices, such as the indigo mechanical thrombectomy device, are medical devices specifically designed to treat patients with severe acute ischemic stroke or embolism caused by thrombus blockage in large blood vessels such as the carotid artery, middle cerebral artery, deep veins of the lower extremities, or arteries of the lower extremities. Acute ischemic stroke (AIS) refers to a condition in which brain tissue is damaged due to hypoxia caused by a sudden interruption of blood flow in cerebral blood vessels. These patients require immediate medical evaluation and emergency treatment, especially within the golden treatment time after onset (usually 4.5 to 6 hours) to minimize brain damage. Before deciding to use the indigo mechanical thrombectomy device, a comprehensive and careful evaluation must be conducted to ensure that the following conditions are met: (1) the patient's National Institutes of Health Scale (NIHSS) score is greater than 7; (2) imaging examination shows large vessel occlusion with a relatively small core infarct area.

[0004] While the Indigo mechanical thrombectomy device offers a more effective treatment option, its complex structure and high cost are significant obstacles to its widespread adoption. Specifically, the Indigo device comprises numerous sophisticated mechanical and electronic components. This complex combination not only increases manufacturing costs but also necessitates more meticulous maintenance and upkeep. Failure of any component requires specialized technicians, further increasing operating costs for healthcare institutions. Furthermore, the high cost of the device itself and the increased maintenance expenses result in extremely expensive treatments, exceeding the financial means of many patients. For those with limited financial resources, even if they urgently need this treatment, the prohibitive cost may force them to forgo it. Summary of the Invention

[0005] The present invention aims to provide a simple negative pressure suction device to solve the technical problems of complex structure and high cost of existing negative pressure suction devices.

[0006] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: a simple negative pressure thrombectomy device, including a syringe and a push rod. The push rod is slidably disposed inside the syringe and is used to extract newly formed and unorganized thrombi from veins or arteries. The top of the push rod extends into the inner cavity of the syringe, forming a sealed contact with the inside of the syringe, and the tail of the push rod is located outside the syringe. When the push rod is evacuated to its maximum value, the distance between the tail of the push rod and the tail of the syringe reaches its maximum value. A detachable support assembly is connected between the tail of the push rod and the tail of the syringe. The support assembly is used to maintain the push rod and the syringe at the maximum value of the negative pressure vacuum. Side wings extend horizontally from both sides of the tail end of the syringe to provide a support surface. The side of the side wing near the tail of the push rod has a groove for locking the support assembly. One end of the support assembly contacts the groove, and the other end contacts the tail of the push rod.

[0007] The principle of this solution is as follows: In practical application, after thrombus aspiration is completed, that is, when the push rod is drawn outward to its maximum vacuum, and the distance between the tail of the push rod and the tail of the syringe reaches its maximum, a support component is used to support and lock the push rod to prevent it from rebounding, thereby maintaining a negative pressure state. First, align one end of the support component with the groove on the side wing and insert it into the groove, ensuring that it is fully embedded to achieve a stable connection; then, contact the other end of the support component with the tail of the push rod, so that the entire support component is completely locked between the side wing and the tail of the push rod, thereby completing the locking between the two side wings and the entire tail of the push rod, so that the entire device can remain stable and immobile when maintaining a negative pressure state.

[0008] The advantages of this solution are:

[0009] (1) This solution breaks the conventional wisdom that thrombus removal can only be effectively performed by relying on complex and expensive equipment, thus overcoming the traditional prejudice that "the more complex, the better, and the more expensive, the better." Through the ingenious combination design of support components, side wings, and grooves, this solution not only achieves efficient and safe thrombus removal but also reduces manufacturing and usage costs while significantly improving ease of operation.

[0010] (2) The combined use of support components, side wings and grooves ensures that the thrombus removal effect is provided while reducing the economic burden on medical institutions and patients.

[0011] (3) The support components provide sufficient support to ensure the stability and stillness of the entire device under negative pressure, prevent thrombus dislodgement or backflow caused by external vibration or improper operation, and ensure that the push rod will not bounce or move under negative pressure, which greatly enhances the stability of the entire device and improves the safety of operation.

[0012] (4) The combined use of support components, side wings and grooves creates a strong negative pressure environment without sacrificing the extraction function and without rebounding.

[0013] (5) The device has a simple structure, which effectively reduces the operational burden on medical staff, making the whole process more labor-saving, fast and convenient, thereby improving the efficiency and safety of thrombus removal.

[0014] Preferably, as an improvement, the support assembly includes a support rod and rubber heads for increasing friction, the rubber heads being located at both ends of the support rod.

[0015] Beneficial effects: The rubber head provides significant friction, ensuring the support rod remains firmly positioned between the groove and the push rod tail, preventing slippage or displacement during operation, thus enhancing the stability and reliability of the entire device. Furthermore, its elasticity allows it to adapt to grooves / contact surfaces of different sizes and shapes, enabling the support assembly to better fit the groove and push rod tail, ensuring good contact even within manufacturing tolerances.

[0016] Preferably, as an improvement, the rubber head includes a first rubber head and a third rubber head, the first rubber head contacting the groove and the third rubber head contacting the tail of the push rod.

[0017] Beneficial effects: The design of the first and third rubber heads increases the friction between the groove and the first rubber head, and between the end of the push rod and the third rubber head, thereby enhancing the stability of the device and making the support components less likely to fall off.

[0018] Preferably, as an improvement, the depth of the groove is in the range of 1-3 mm.

[0019] Beneficial effects: The thickness range of 1-3mm allows the rubber head to be better embedded in the groove, forming a stable mechanical connection, thereby increasing friction, reducing the possibility of slippage, and preventing the support components from loosening or falling off during operation.

[0020] Preferably, as an improvement, a second rubber head is installed on the top of the push rod, and the second rubber head is connected to the top of the push rod by a shock-absorbing spring.

[0021] Beneficial effects: The shock-absorbing spring can effectively absorb the vibration generated during rebound, preventing these vibrations from being transmitted to the support components or syringe, thereby maintaining the stability of the entire device and reducing the possibility of the syringe breaking due to excessive negative pressure during rebound.

[0022] Preferably, as an improvement, the support rod has a "cross" structure, and the cross section of the support rod is composed of four rectangles of equal length extending in pairs from the central intersection point along two mutually perpendicular directions; the support rod and the push rod are staggered and engaged.

[0023] Beneficial effects: The cross structure provides multiple contact points, allowing pressure to be distributed more evenly across each contact point, reducing the risk of excessive force on a single point, thereby enhancing the connection stability between the support rod and the push rod; the staggered snap-fit ​​creates an interlock-like effect, making the connection between the support rod and the push rod tighter and effectively preventing loosening or slippage.

[0024] Preferably, as an improvement, the maximum value of the vacuum negative pressure is 0.07 MPa.

[0025] Beneficial effects: A negative pressure of 0.07 MPa provides a strong suction force, which can effectively and quickly separate the thrombus from the blood and draw it into the syringe. This negative pressure state ensures sufficient suction efficiency without damaging blood vessels or surrounding tissues due to excessive negative pressure.

[0026] Preferably, as an improvement, the cross-sectional area of ​​the tail of the push rod is greater than the sum of the cross-sectional areas of the third rubber head on the same side.

[0027] Beneficial effects: The third rubber head, which allows the tail of the push rod to be completely covered, increases the contact area between the tail of the push rod and the third rubber head, reducing the possibility of relative movement and thus enhancing the stability of the support rod.

[0028] Preferably, as an improvement, the syringe tip is provided with a needle, and a connecting sleeve is provided around the needle.

[0029] Beneficial effects: The connecting sleeve has a guiding function, which helps medical staff to quickly and accurately insert the catheter into the needle position.

[0030] Preferably, as an improvement, the inner wall of the connecting sleeve is provided with internal threads for clamping the conduit.

[0031] Beneficial effects: The internal thread design makes the connection between the catheter and the needle more secure, preventing loosening or detachment during operation.

[0032] The beneficial effects of this utility model are: (1) The simple negative pressure thrombectomy device provided by this solution, through the ingenious combination design of support components, grooves, shock-absorbing springs, syringes and push rods, can stably reach a negative pressure state of 0.07 MPa, ensuring efficient and safe thrombus removal, and improving the success rate and efficiency of treatment.

[0033] (2) The structural design of this device ensures efficient thrombus extraction while simplifying the structure and reducing costs. This design effectively reduces the usage costs for medical institutions and patients without affecting the treatment effect.

[0034] (3) The design of the shock-absorbing spring not only prevents the negative pressure from being too large and breaking the syringe when it rebounds, but also avoids the deformation or damage of the first rubber head caused by excessive force / rebound, thus extending the service life of the first rubber head.

[0035] (4) The support rod structure and the design of the first rubber head and the second rubber head in the support assembly enable the support assembly to provide strong support force and friction, thereby preventing the support assembly from sliding and rebounding under the condition of forming a negative pressure environment. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the simple negative pressure thrombectomy device provided in Embodiment 1 of this utility model.

[0037] Figure 2 This is a schematic diagram of the push rod in the simple negative pressure thrombus removal device provided in Embodiment 1 of this utility model.

[0038] Figure 3 This is a schematic diagram of the support component in the simple negative pressure thrombectomy device provided in Embodiment 1 of this utility model.

[0039] Figure 4 This is a top view of the side wing of the simple negative pressure thrombectomy device provided in Embodiment 1 of this utility model.

[0040] Figure 5 This is a schematic diagram of the connecting sleeve in the simple negative pressure thrombectomy device provided in Embodiment 1 of this utility model. Detailed Implementation

[0041] The following detailed description illustrates the specific implementation method:

[0042] The reference numerals in the accompanying drawings include: syringe 1, push rod 2, support rod 3, first rubber head 4, needle 5, side wing 6, connecting sleeve 7, shock-absorbing spring 8, second rubber head 9, third rubber head 10, groove 11, and internal thread 12.

[0043] Example 1:

[0044] The implementation examples are basically as follows Figure 1 , Figure 2 As shown: A simple negative pressure thrombectomy device includes a syringe 1 and a push rod 2. The push rod 2 is slidably disposed inside the syringe 1, with its top extending into the inner cavity of the syringe 1 to form a sealed contact with the inside of the syringe 1. A second rubber head 9 is installed on the top of the push rod 2, and the second rubber head 9 is connected to the top of the push rod 2 by a shock-absorbing spring 8 to prevent excessive negative pressure from breaking the syringe 1 during rebound. The top of the syringe 1 is provided with a needle 5 for thrombus collection, and side wings 6 extend horizontally from both sides of the tail end of the syringe 1 to provide a support surface. The side wings 6 are used to support the support assembly. When the push rod is drawn outward to the maximum vacuum, the distance between the tail of the push rod 2 and the tail of the syringe 1 reaches its maximum. A detachable support assembly is connected between the tail of the push rod 2 and the tail of the syringe 1. One end of the support assembly contacts the side wing 6, and the other end contacts the tail of the push rod 2. The support rod assembly is used to provide sufficient support force to withstand the pressure of the push rod 2 under negative pressure, preventing the push rod 2 from rebounding due to external pressure or internal elasticity. This ensures that the device can stably maintain a negative pressure state, providing ideal conditions for the effective removal of thrombi.

[0045] Specifically, this invention is used to extract newly formed, unorganized thrombi from larger arteries (such as the carotid artery and femoral artery) or veins (such as the deep veins of the lower limbs and the veins of the upper limbs). Newly formed, unorganized thrombi refer to thrombi that have just formed within the blood vessel, are still in their early stages, and have not yet been replaced or encapsulated by the body's repair mechanisms (such as the growth of granulation tissue). These thrombi have a short formation time, usually within a few hours to a few days, generally not exceeding 7-10 days; their structure is loose: the fibrin network and aggregated platelets inside the thrombus are not yet fully stable and easy to extract.

[0046] like Figure 3As shown, the support assembly includes a support rod 3 and rubber heads for increasing friction. The rubber heads include a first rubber head 4 and a third rubber head 10. One end of the support rod 3 contacts the side wing 6 via the first rubber head 4, and the other end contacts the tail of the push rod 2 via the third rubber head 10. The first rubber head 4 and the third rubber head 10 are used to increase friction and ensure a stable connection between the support assembly, the side wing 6, and the push rod 2, thereby ensuring that the support assembly will not easily slide or fall off. They also provide good sealing performance to prevent air from entering. In this embodiment, the support rod 3 has a "cross" structure. The cross-section of the support rod 3 is composed of four equally long rectangles extending in pairs from the central intersection point along two mutually perpendicular directions. Specifically, the overall structure of the support rod 3 is divided into three parts from bottom to top: a first support rod, a transition rod, and a second support rod. The first and second support rods have similar structures but different sizes; the first support rod is relatively larger, while the second support rod is smaller. The first and second support rods are connected by a transition rod, ensuring the continuity and stability of the entire support rod 3.

[0047] In this embodiment, the first rubber head 4 and the third rubber head 10 are circular, elliptical, or rectangular in shape. Specifically, the "cross" shape of the support rod 3 matches the shape of the push rod 2, allowing them to interlock tightly during operation, ensuring no shifting or loosening occurs. This tight fit not only reduces the possibility of air leakage but also helps maintain the negative pressure required by the device, thereby ensuring efficient thrombus extraction. Both the first rubber head 4 and the third rubber head 10 are circular in shape and can completely cover both ends of the support rod 3, increasing the contact area between the rubber head and the ends of the support rod 3, thereby improving the stability and reliability of the support assembly.

[0048] like Figure 4 As shown, the side wings 6 on both sides of the syringe 1, near the tail of the push rod 1, are provided with grooves 11 for engaging the support assembly. The grooves 11 ensure proper alignment between the support assembly and the side wings 6, preventing operational instability or functional failure due to positional deviations, and ensuring that they do not shift or loosen during operation, providing a stable connection and enhancing the rigidity and stability of the entire negative pressure thrombectomy device. Specifically, the depth of the grooves 11 ranges from 1 to 3 mm, and the shape of the grooves 11 is one of a circle, a long strip, or an ellipse, matching the shape of the first rubber head 4; the shape of the side wings is one of a circle, a long strip, a rectangle, or an ellipse. In this embodiment, the depth of the grooves 11 is set to 2 mm, and their shape is circular, matching the shape of the first rubber head 4, ensuring a tight fit and locking between the grooves 11 and the first rubber head 4. The side wings 6 are rectangular in shape.

[0049] The specific implementation process is as follows:

[0050] The simple negative pressure thrombectomy device is a 60ml empty needle. The push rod 2 is slidably set inside the syringe 1. The outer diameter of the push rod 2 is similar to the inner diameter of the syringe 1. Before thrombus aspiration, the needle 5 is connected to the catheter for transporting the thrombus.

[0051] During extraction, the push rod 2 is pulled outwards from the syringe 1 to create a negative pressure state, allowing for thrombus aspiration. A second rubber head 9 is installed at the top of the push rod 2, which fits tightly against the inner wall of the syringe 1. This ensures that the thrombus will not leak from the gap between the syringe 1 and the push rod 2 during extraction. Simultaneously, the second rubber head 9 creates a good airtight environment, preventing outside air from entering the syringe 1 and avoiding contamination or interference with thrombus extraction, thus maintaining the sealing and safety of the extraction process. A shock-absorbing spring 8 is installed between the second rubber head 9 and the top of the push rod 2. The shock-absorbing spring 8 prevents the push rod 2 from rebounding and rupturing the syringe 1 due to pressure during extraction, thereby ensuring the safety of medical personnel.

[0052] After the extraction is complete, i.e., when the vacuum is drawn to its maximum value and the distance between the tail of the push rod and the tail of the syringe reaches its maximum, a support assembly is used to support and lock the push rod 2. First, the first rubber head 4 at one end of the support rod 3 is aligned with the groove 11 on the side wing 6 and inserted into the groove 11, ensuring complete embedding and a secure connection. Then, the "cross" sections of the support rod 3's "cross" structure are interlaced and inserted into the push rod 2, making them tightly locked together. Finally, the third rubber head 10 at the other end of the support rod 3 contacts the tail of the push rod 2, thus locking the side wings 6 to the tail of the push rod 2, allowing the entire device to remain stationary under negative pressure. The support assembly effectively prevents the push rod 2 from rebounding, effectively reduces the operational burden on medical personnel, makes the entire process more labor-saving and convenient, and improves the efficiency and safety of thrombus extraction. In this embodiment, the maximum vacuum negative pressure is 0.07 MPa (i.e., the negative pressure value reached after extraction is 0.07 MPa).

[0053] The tail of the push rod 2 is shaped like a circle, a rectangle, or an ellipse. In this embodiment, the tail of the push rod 2 is circular. The cross-sectional area of ​​the tail of the push rod 2 is greater than the sum of the cross-sectional areas of the third rubber head 10 on the same side, so that the tail of the push rod 2 can completely cover the area of ​​the third rubber head 10, increasing the contact area between the tail of the push rod 2 and the third rubber head 10, reducing the possibility of relative movement, and thus enhancing the stability of the support rod 3.

[0054] The negative pressure thrombectomy device provided in this embodiment can effectively form and stably maintain a negative pressure of 0.07 MPa during operation, ensuring stability and efficiency during operation, so that the thrombus can be quickly and safely extracted from the blood.

[0055] The negative pressure thrombectomy device provided in this solution breaks with the conventional wisdom that effective thrombus removal requires complex and costly equipment, thus overcoming the traditional prejudice that "the more complex, the better; the more expensive, the better." Through the ingenious combination of the support component, side wings 6, and groove 11, this solution achieves a stable negative pressure of 0.07 MPa, enabling not only efficient and safe thrombus removal but also reducing manufacturing and usage costs while significantly improving operational convenience. The tight fit between the support component and the push rod 2, along with the sealing performance provided by the rubber head, ensures that the device maintains a stable negative pressure during thrombus removal. This is crucial for efficient and safe thrombus removal. The "cross" structure of the support rod 3 and the dual function of the rubber head make the entire device more stable during operation, reducing shaking and vibration and improving operational accuracy. In addition to providing greater friction, the first, second, and third rubber heads also have a certain degree of elasticity, allowing them to adapt to grooves / contact surfaces of different sizes and shapes. This enables the support assembly to better fit the groove and the end of the push rod, ensuring good contact even within manufacturing tolerances.

[0056] Example 2

[0057] The difference between this embodiment and Embodiment 1 is that the syringe 1 has a needle 5 at the tip, and a connecting sleeve 7 is provided around the needle 5; the inner wall of the connecting sleeve 7 is provided with an internal thread 12 for clamping the catheter.

[0058] Specifically, such as Figure 5 As shown, a connecting sleeve 7 is provided around the needle 5, and the inner wall of the connecting sleeve 7 has an internal thread 12. When it is necessary to extract a thrombus, the catheter for transporting the thrombus is connected between the needle 5 and the connecting sleeve 7. The connecting sleeve 7 serves a guiding function, helping medical personnel to quickly and accurately insert the catheter into the position of the needle 5, and the internal thread 12 tightly locks the catheter between the needle 5 and the connecting sleeve 7, increasing the stability of the connection and preventing the catheter from loosening or falling off during the operation. In this embodiment, the needle is a hollow cylinder used for transporting the thrombus.

[0059] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A simple negative pressure thrombectomy device, comprising a syringe and a push rod, wherein the push rod is slidably disposed within the syringe, characterized in that: This device is used to extract newly formed, unorganized thrombi from veins or arteries. The top of the push rod extends into the inner cavity of the syringe, forming a sealed contact with the inside of the syringe, while the tail of the push rod is located outside the syringe. When the push rod is evacuated to its maximum value, and the distance between the tail of the push rod and the tail of the syringe reaches its maximum, a detachable support assembly connects the tail of the push rod and the tail of the syringe. The support assembly is used to maintain the push rod and the syringe at the maximum negative vacuum pressure. Side wings extend horizontally from both sides of the syringe tail end to provide a support surface. The side wings near the tail of the push rod have grooves for engaging the support assembly. One end of the support assembly contacts the groove, and the other end contacts the tail of the push rod. The support assembly includes a support rod and rubber heads for increasing friction, the rubber heads being located at both ends of the support rod.

2. The simple negative pressure thrombectomy device according to claim 1, characterized in that: The rubber head includes a first rubber head and a third rubber head, the first rubber head being in contact with the groove, and the third rubber head being in contact with the tail of the push rod.

3. The simplified negative pressure thrombectomy device according to claim 1, characterized in that: The depth of the groove ranges from 1 to 3 mm.

4. The simple negative pressure thrombectomy device according to claim 1, characterized in that: A second rubber head is installed on the top of the push rod, and the second rubber head is connected to the top of the push rod by a shock-absorbing spring.

5. The simple negative pressure thrombectomy device according to claim 1, characterized in that: The support rod has a "cross" structure. The cross-section of the support rod is composed of four rectangles of equal length that extend in pairs from the central intersection point along two mutually perpendicular directions. The support rod and the push rod are staggered and interlocked.

6. The simplified negative pressure thrombectomy device according to claim 1, characterized in that: The maximum negative pressure of the vacuum pump is 0.07 MPa.

7. The simplified negative pressure thrombectomy device according to claim 2, characterized in that: The cross-sectional area of ​​the tail of the push rod is greater than the sum of the cross-sectional areas of the third rubber head on the same side.

8. The simplified negative pressure thrombectomy device according to claim 1, characterized in that: The syringe has a needle at the top and a connecting sleeve around the needle.

9. The simplified negative pressure thrombectomy device according to claim 8, characterized in that: The inner wall of the connecting sleeve is provided with internal threads for clamping the conduit.

Images