Negative pressure syringe

Abstract

The present invention discloses a negative pressure syringe, comprising a syringe and a push rod, wherein the syringe is provided with a mounting block, the mounting block is provided with a mounting hole connected to the inner cavity of the syringe, an elastic member and a baffle are provided in the mounting hole, and the push rod is provided with a groove; during the movement of the push rod, the push rod is rotated until the baffle is opposite to the groove, and the baffle moves toward the push rod under the elastic action of the elastic member and is engaged in the groove, so as to lock the push rod on the syringe, so that the suction negative pressure is maintained in the syringe; the negative pressure syringe of the present invention can be accurately locked and can maintain a negative pressure state for a long time, which is conducive to achieving a better thrombus suction effect, and the locking operation is relatively simple and can be operated by one person.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a negative pressure syringe. Background Art

[0002] Thrombosis is a major cause of acute and chronic cardiovascular and cerebrovascular diseases, including stroke, myocardial infarction, pulmonary embolism, and lower extremity venous thrombosis. It is a common and serious clinical ailment that not only reduces patients' quality of life, poses a serious threat to their lives, but also increases the economic burden. Currently, percutaneous thrombus aspiration is a procedure that involves successfully puncturing the patient's popliteal vein or unaffected femoral vein. A catheter sheath is then placed at the site of the thrombus, and the thrombus is directly aspirated using a syringe.

[0003] When using a syringe to aspirate thrombus, the existing syringe requires the operator to have a certain amount of arm strength to maintain a negative pressure state, which makes the operation difficult; large-capacity syringes often have a greater suction force, and the operator cannot keep the syringe in a negative pressure state for a long time, which can easily cause injury to the operator, and in severe cases, the thrombus aspiration operation may fail. Summary of the Invention

[0004] The main purpose of the present invention is to propose a negative pressure syringe, which aims to solve the technical problems that existing negative pressure syringes are difficult to operate and large-capacity syringes have a large suction force, resulting in the inability to maintain a negative pressure state for a long time.

[0005] To achieve the above-mentioned object, the present invention provides a negative pressure syringe, comprising a syringe and a push rod, wherein the syringe is provided with a mounting block, the mounting block is provided with a mounting hole communicating with the inner cavity of the syringe, an elastic member and a blocking rod are provided in the mounting hole, and the push rod is provided with a groove;

[0006] During the movement of the push rod, the push rod is rotated and moved until the baffle rod is opposite the groove. Under the elastic action of the elastic member, the baffle rod moves toward the push rod and is engaged in the groove to lock the push rod on the syringe, so that the suction negative pressure is maintained in the syringe.

[0007] In some embodiments, the elastic member is a spring. When the push rod is not locked, the elastic member is in a compressed state, one end of the blocking rod is located in the mounting hole, and the other end abuts against the push rod.

[0008] In some embodiments, the mounting hole is cylindrical, and the length direction of the mounting hole is perpendicular to the axis direction of the push rod;

[0009] The blocking rod is in the shape of a round rod, and the radial dimensions of the spring and the blocking rod are adapted to the radial dimensions of the mounting hole.

[0010] In some embodiments, the natural length of the spring is defined as L1, the length of the blocking rod is defined as L2, the length of the mounting hole is defined as L3, the distance between the syringe and the push rod is defined as L4, the depth of the groove is defined as H, and (L1+L2)≥(L3+L4+H).

[0011] In some embodiments, the length of the mounting hole is 28-32 mm, the length of the round rod is 12-18 mm, and the depth of the groove is 4-6 mm.

[0012] In some embodiments, the radial dimension of the groove is adapted to the radial dimension of the blocking rod, and the end of the blocking rod facing the push rod is a hemispherical surface.

[0013] In some embodiments, the syringe has a cavity with an open end, and the mounting block is arranged on the inner wall of the syringe and near the open end; the push rod includes a push rod body and a piston head arranged at the distal end of the push rod body, the push rod body can be movably passed through the cavity, the piston head is in sealing contact with the inner wall of the cavity, and the groove is arranged on the push rod body and near the piston head.

[0014] In some embodiments, the distance between the mounting block and the open end of the syringe is 18-22 mm; and / or the distance between the groove and the piston head is 18-22 mm.

[0015] In some embodiments, there are two grooves, which are arranged opposite to each other on the outer wall of the push rod. When the push rod is locked, the end of the blocking rod away from the elastic member is engaged in one of the grooves; or

[0016] There are three grooves, which are evenly arranged on the outer wall of the push rod along the circumference of the push rod. When the push rod is locked, the end of the blocking rod away from the elastic member is clamped in one of the grooves.

[0017] In some embodiments, the distal end of the syringe is configured as a Luer interface, and the inner cavity of the Luer interface is connected to the inner cavity of the syringe.

[0018] The negative pressure syringe provided by the present invention includes a syringe and a push rod. The syringe is provided with a mounting block, the mounting block is provided with a mounting hole connected to the inner cavity of the syringe, an elastic member and a baffle are provided in the mounting hole, and the push rod is provided with a groove. During the movement of the push rod, the push rod is rotated until the baffle is directly opposite the groove. Under the elastic action of the elastic member, the baffle moves toward the push rod and is engaged in the groove, thereby locking the push rod to the syringe, so that the syringe maintains a negative pressure for suction. The push rod is locked to the syringe by the cooperation of the elastic member, the baffle, and the groove. In this way, the negative pressure syringe can be accurately locked and the negative pressure state can be maintained for a long time, which is conducive to achieving a better thrombus suction effect. In addition, the locking operation is relatively simple and can be operated by one person. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0020] Figure 1 A schematic structural diagram of an embodiment of a negative pressure syringe provided by the present invention;

[0021] Figure 2 A schematic cross-sectional view of the negative pressure syringe provided by the present invention in a negative pressure locked state;

[0022] Figure 3 for Figure 2 A magnified schematic diagram of the local structure;

[0023] Figure 4 A schematic cross-sectional view of the negative pressure syringe provided by the present invention from another perspective;

[0024] Figure 5 A schematic cross-sectional view of the negative pressure syringe provided by the present invention in a negative pressure locked state from another perspective;

[0025] Figure 6 for Figure 5 Schematic diagram of the cross-sectional structure of the negative pressure syringe with the push rod rotated 90° and in the unlocked state;

[0026] Figure 7 for Figure 1 Schematic diagram of the structure of the middle push rod;

[0027] Figure 8 for Figure 7 A schematic diagram of the structure of the putter from another perspective;

[0028] Figure 9 for Figure 1Schematic diagram of the cross-sectional structure of the middle syringe.

[0029] Description of Figure Numbers:

[0030] 1-syringe; 11-receiving chamber; 12-opening end; 13-Luer interface; 2-push rod; 21-push rod body; 22-piston head; 23-groove; 3-mounting block; 31-mounting hole; 4-spring; 5-stop rod.

[0031] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0033] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0034] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0035] In addition, in the present invention, descriptions such as "first" and "second" are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0036] In order to solve the technical problems that existing negative pressure syringes are difficult to operate and large-capacity syringes have large suction forces, resulting in the inability to maintain a negative pressure state for a long time, the present invention proposes a negative pressure syringe that can be locked under negative pressure, has a simple locking operation, and can maintain a negative pressure state for a long time.

[0037] Please refer to Figures 1 to 3 In one embodiment of the present invention, the negative pressure syringe includes a syringe 1 and a push rod 2. The syringe 1 is provided with a mounting block 3. The mounting block 3 is provided with a mounting hole 31 connected to the inner cavity of the syringe 1. An elastic member and a baffle 5 are provided in the mounting hole 31. The push rod 2 is provided with a groove 23. During the movement of the push rod 2, the push rod 2 is rotated until the baffle 5 is opposite to the groove 23. Under the elastic action of the elastic member, the baffle 5 moves toward the direction close to the push rod 2 and is engaged in the groove 23 to lock the push rod 2 on the syringe 1, so that the suction negative pressure is maintained in the syringe 1.

[0038] Specifically, the mounting block 3 is convexly arranged on the outside of the syringe 1 and is arranged near the proximal end of the syringe 1. The mounting block 3 is a roughly square block, and its material is the same as that of the syringe 1. The mounting block 3 and the syringe 1 can be integrally formed during production. The mounting hole 31 is a long hole, and its length direction is perpendicular to the length direction of the syringe 1 (i.e., the radial direction of the syringe 1), and is connected to the inner cavity of the syringe 1; the elastic member is arranged in the mounting hole 31, one end of which elastically abuts against the bottom wall of the mounting hole 31, and the other end is located inside the mounting hole 31 and elastically abuts against one end of the blocking rod 5, and the other end of the blocking rod 5 is exposed in the mounting hole 31 and abuts against the push rod 2. A groove 23 is provided near the distal end of the push rod 2, and the shape and size of the groove 23 are not limited. During the movement of the push rod 2 toward the proximal end, the baffle rod 5 and the groove 23 are staggered. When the groove 23 is moved to the proximal side of the baffle rod 5, the push rod 2 is rotated so that the baffle rod 5 is opposite the groove 23. Then the push rod 2 is moved toward the distal direction until the baffle rod 5 is aligned with the groove 23. At this time, under the elastic action of the elastic member, the baffle rod 5 moves toward the direction close to the push rod 2 and is engaged in the groove 23, thereby locking the push rod 2 on the syringe 1, so that the suction negative pressure in the syringe 1 is maintained for a longer time and more stably.

[0039] It should be noted that if Figure 3 As shown, when the push rod 2 is locked, one end of the blocking rod 5 is located in the groove 23 and the other end is located in the mounting hole 31. At this time, the elastic member is in a compressed state or a natural state.

[0040] The negative pressure syringe provided by the present invention locks the push rod 2 on the syringe 1 through the elastic cooperation of the elastic member, the blocking rod 5 and the groove 23, so that the suction negative pressure is maintained in the syringe 1. The negative pressure syringe can be accurately locked and can maintain the negative pressure state for a long time, which is conducive to achieving a better thrombus suction effect. In addition, the locking operation is relatively simple and can be operated by one person.

[0041] In a specific embodiment of the present invention, Figure 4 As shown, the elastic member is a spring 4. When the push rod 2 is not locked, the elastic member is in a compressed state, one end of the blocking rod 5 is located in the mounting hole 31, and the other end is against the push rod 2. Such an arrangement can achieve the locking and locking operation of the negative pressure syringe.

[0042] It should be noted that, referring to Figure 5 and Figure 6 After the push rod 2 is locked, it can be rotated, compressing the spring 4 so that the end of the blocking rod 5 away from the spring 4 moves out of the groove 23, thereby unlocking the push rod 2. After unlocking, the end of the blocking rod 5 away from the spring 4 contacts the surface of the push rod 2. The rotation angle of the push rod 2 during the process from locking to unlocking the push rod 2 is not limited. As long as the blocking rod 5 is offset from the groove 23 after rotating the push rod 2, that is, the blocking rod 5 is removed from the groove 23, it is within the scope of protection of the present invention. If negative pressure is required later, the above locking operation can be repeated.

[0043] In one embodiment of the present invention, mounting hole 31 is cylindrical, with its length perpendicular to the rod's axis. Barrier rod 5 is round, and the radial dimensions of spring 4 and barrier rod 5 match those of mounting hole 31. This arrangement limits the movement of barrier rod 5, effectively ensuring that its movement direction coincides with the length of mounting hole 31. This allows the end of barrier rod 5 away from spring 4 to be effectively engaged within groove 23, enhancing the stability and reliability of the locking operation.

[0044] Define the natural length of spring 4 as L1, the length of retaining rod 5 as L2, the length of mounting hole 31 as L3, the distance between syringe 1 and push rod 2 as L4, the depth of groove 23 as H, and (L1+L2)≥(L3+L4+H). This arrangement ensures that when push rod 2 is unlocked, spring 4 is in a compressed or natural state, and the end of retaining rod 5 facing spring 4 is located within mounting hole 31, thus achieving a repeatable locking operation of the negative pressure syringe.

[0045] In a specific embodiment of the present invention, the length of the mounting hole 31 is 28-32 mm (for example, 28 mm, 29 mm, 30 mm, 31 mm, 32 mm, and any interval between the two end points), the length of the round rod is 12-18 mm (for example, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, and any interval between the two end points), and the depth of the groove 23 is 4-6 mm (for example, 4 mm, 5 mm, 6 mm, and any interval between the two end points).

[0046] Alternatively, as Figure 8As shown, the groove 23 extends along the circumference of the push rod 2, that is, the groove 23 is an arc-shaped groove 23, which is convenient for the operation of opening the groove 23 and for rotating the push rod 2 to perform the unlocking operation.

[0047] like Figures 3 to 5 As shown, in some embodiments of the present invention, the radial dimension of the groove 23 is adapted to the radial dimension of the blocking rod 5, and the end of the blocking rod 5 facing the push rod 2 is a hemispherical surface. This arrangement ensures that the blocking rod 5 can be stably engaged in the groove 23 when the push rod 2 is locked, and is not prone to shaking, thereby ensuring the stability of the locking of the push rod 2. At the same time, the hemispherical surface of the end of the blocking rod 5 facing the push rod 2 facilitates the rotation of the push rod 2 so that the blocking rod 5 can be quickly and smoothly moved out of the groove 23, resulting in a faster unlocking operation.

[0048] In some embodiments of the present invention, Figure 8 and Figure 9 As shown, the syringe 1 has a cavity 11 with an open end, and the mounting block 3 is arranged on the inner wall of the syringe 1 and near the open end 12 (i.e., the proximal end); the push rod 2 includes a push rod body 21 and a piston head 22 arranged at the distal end of the push rod body 21. The push rod body 21 is movably inserted into the cavity 11, and the piston head 22 is in sealing contact with the inner wall of the cavity 11. The groove 23 is arranged on the push rod body 21 and is arranged near the piston head 22. Such an arrangement can ensure that the syringe 1 has a large negative pressure cavity when the push rod 2 is locked, that is, it ensures that the negative pressure syringe has a large suction negative pressure when locked. It should be noted that when the push rod 2 is locked, the piston head 22 is in sealed contact with the inner wall of the cavity 11 of the syringe 1 to form a negative pressure cavity.

[0049] In a specific embodiment of the present invention, the distance between the mounting block 3 and the open end 12 of the syringe 1 is 18-22 mm (for example, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, and an interval between any two end point values); the distance between the groove 23 and the piston head 22 is 18-22 mm (for example, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, and an interval between any two end point values).

[0050] like Figures 5 to 7 As shown, in some embodiments of the present invention, two grooves 23 are provided, and the two grooves 23 are arranged oppositely on the outer wall of the push rod 2. When the push rod 2 is locked, the end of the blocking rod 5 away from the elastic member is clamped in one of the grooves 23.

[0051] In this embodiment, two grooves 23 are provided. Locking can be achieved by simply engaging the lever 5 in one of the grooves 23, making operation faster and more convenient. To unlock, the push rod 2 can be rotated 90°, allowing the lever 5 to slide out of the groove 23, compressing the spring 4 to complete the unlocking process. To subsequently lock, the push rod 2 can be rotated another 90°. This arrangement allows repeated locking and unlocking operations to be achieved by rotating the push rod 2 90°, while also ensuring good locking stability for the negative pressure syringe.

[0052] Of course, when repeating the locking and unlocking operations, it can also be achieved by rotating the push rod 2 to other angles, as long as the blocking rod 5 and the groove 23 are misaligned when unlocking and aligned with the groove 23 when locking.

[0053] In some other embodiments of the present invention, three grooves 23 are provided, and the three grooves 23 are evenly arranged on the outer wall of the push rod 2 along the circumference of the push rod 2. When the push rod 2 is locked, the end of the blocking rod 5 away from the elastic member is clamped in one of the grooves 23.

[0054] In this embodiment, three grooves 23 are provided. Locking can be achieved by simply engaging the lever 5 in one of the grooves 23, making operation faster and more convenient. To unlock, the push rod 2 can be rotated 60°, allowing the lever 5 to slide out of the groove 23, compressing the spring 4 to complete the unlocking process. To subsequently lock, the push rod 2 can be rotated another 60°. This arrangement allows repeated locking and unlocking operations to be achieved by rotating the push rod 2 60°, while also ensuring that the negative pressure syringe has good locking stability.

[0055] Of course, when repeating the locking and unlocking operations, it can also be achieved by rotating the push rod 2 to other angles, as long as the blocking rod 5 and the groove 23 are misaligned when unlocking and aligned with the groove 23 when locking.

[0056] like Figure 9 As shown, in some embodiments of the present invention, the distal end of the syringe 1 is provided with a Luer interface 13, and the inner cavity of the Luer interface 13 is connected to the inner cavity of the syringe 1. Such a configuration allows the Luer interface 13 to be easily docked with the Luer connector of other instruments.

[0057] The specific steps of using the negative pressure syringe of the present invention are as follows: in the interventional surgical treatment of thrombus removal, an instrument intervention channel is established in the femoral artery (venous) through a puncture needle, a guide wire, a catheter and a small puncture sheath. The catheter is introduced into the blocked part of the blood vessel through the intravascular intervention channel technology, and then selective angiography is performed to determine the blood vessel where the thrombus is located. A catheter is introduced into the blood vessel where the thrombus is located through the guide wire, and the negative pressure syringe of the present invention is taken out, and the outlet of the negative pressure syringe (i.e., the Luer interface 13 at the distal end of the syringe 1) is connected to the Luer connector of the catheter. By pulling and pulling the push rod 2, a negative pressure is formed in the syringe 1 (the air pressure in the syringe 1 is less than the external atmospheric pressure at this time), and then the push rod 2 is locked on the syringe 1 (the locking method is shown in the above embodiment, and will not be repeated here), so that a basically constant negative pressure is maintained in the syringe 1 until the thrombus is extracted; finally, the catheter is withdrawn from the body, the wound is sutured, and the operation is completed.

[0058] The negative pressure syringe of the present invention can not only effectively provide suction negative pressure for a long time, but also release and free the doctor's hands from the laborious pulling during operation, saving physical effort and facilitating operation; at the same time, its basic operation is consistent with that of an ordinary syringe, and it is easy to use and carry, and therefore suitable for promotion and application.

[0059] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention description and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A negative pressure syringe for aspirating thrombus, characterized in that: The negative pressure syringe includes a syringe and a push rod. The syringe is provided with a mounting block. The mounting block is provided with a mounting hole communicating with the inner cavity of the syringe. An elastic member and a blocking rod are provided in the mounting hole. The push rod is provided with a groove near the distal end. During the movement of the push rod, the push rod is rotated until the blocking rod is aligned with the groove. Under the elastic action of the elastic member, the blocking rod moves toward the push rod and is engaged in the groove, thereby locking the push rod on the syringe, so that the suction negative pressure is maintained in the syringe. When the push rod is locked, one end of the blocking rod is located in the groove, the other end is located in the mounting hole, and the elastic member is in a compressed state or a natural state; The elastic member is a spring. When the push rod is unlocked, the elastic member is in a compressed state, one end of the blocking rod is located in the mounting hole, and the other end abuts against the push rod. The mounting hole is cylindrical, and the length direction of the mounting hole is perpendicular to the axis direction of the push rod; The blocking rod is in the shape of a round rod, and the radial dimensions of the spring and the blocking rod are adapted to the radial dimensions of the mounting hole; Define the natural length of the spring as L1, the length of the blocking rod as L2, the length of the mounting hole as L3, the distance between the syringe and the push rod as L4, the depth of the groove as H, and (L1+L2)≥(L3+L4+H); The radial dimension of the groove is adapted to the radial dimension of the blocking rod, and the end of the blocking rod facing the push rod is a hemispherical surface; The length of the mounting hole is 28-32 mm, the length of the blocking rod is 12-18 mm, and the depth of the groove is 4-6 mm; There are three grooves, which are evenly arranged on the outer wall of the push rod along the circumference of the push rod. When the push rod is locked, the end of the blocking rod away from the elastic member is clamped in one of the grooves. The distal end of the syringe is provided with a Luer interface, and the inner cavity of the Luer interface is communicated with the inner cavity of the syringe.

2. The negative pressure syringe according to claim 1, wherein The syringe has a cavity with an open end, and the mounting block is arranged on the inner wall of the syringe and adjacent to the open end; The push rod includes a push rod body and a piston head arranged at the distal end of the push rod body. The push rod body can be movably inserted into the cavity. The piston head is in sealing contact with the inner wall of the cavity. The groove is arranged on the push rod body and adjacent to the piston head.

3. The negative pressure injector according to claim 2, wherein: The distance between the mounting block and the open end of the syringe is 18-22 mm; and / or, The distance between the groove and the piston head is 18-22 mm.

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