CN118680628A - Negative pressure syringe - Google Patents

Abstract

The present invention discloses a negative pressure syringe, comprising a syringe and a push rod, wherein a first baffle is arranged on the inner wall of the syringe, and a second baffle is arranged on the outer wall of the push rod, and an angle is formed between the length direction of the first baffle and the length direction of the second baffle. During the movement of the push rod, the push rod is rotated until the first baffle is directly opposite to and clamped on the second baffle, 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 provided by 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. In addition, the locking operation is relatively simple and can be operated by one person, and the locking operation can be repeated.

Description

Negative pressure syringe

Technical Field

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

Background Art

Thrombosis is the main cause of acute and chronic cardiovascular and cerebrovascular diseases. Thrombotic diseases include stroke, myocardial infarction, pulmonary embolism, lower extremity venous thrombosis, etc. It is one of the common serious diseases in clinical practice. It not only reduces the quality of life of patients, seriously threatens the life of patients, but also increases the economic burden. In the existing technology, percutaneous artificial thrombus aspiration can be used to successfully puncture the patient's popliteal vein or healthy femoral vein, place a catheter sheath at the thrombus, and then use a syringe to directly aspirate the thrombus.

When using a syringe to aspirate thrombus, the existing syringe needs to maintain a negative pressure state, which requires the operator to have a certain amount of arm strength, making 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, cause the thrombus aspiration operation to fail.

Summary of the invention

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

To achieve the above object, the present invention provides a negative pressure syringe, comprising a syringe and a push rod, wherein the inner wall of the syringe is provided with a first stopper, the outer wall of the push rod is provided with a second stopper, and the length direction of the first stopper and the length direction of the second stopper form an angle;

During the movement of the push rod, the push rod is rotated until the first stop rod is directly opposite to and engaged with the second stop rod, so as to lock the push rod on the syringe, so that the suction negative pressure is maintained in the syringe.

In some embodiments, the included angle between the length direction of the first barrier rod and the length direction of the second barrier rod is 90°.

In some embodiments, the inner cavity of the syringe is cylindrical, and both ends of the first blocking rod are arc surfaces and are both connected to the inner wall of the syringe.

In some embodiments, the length direction of the second blocking rod is perpendicular to the axial direction of the push rod.

In some embodiments, the distance between the end of the second stopper away from the push rod and the inner wall of the syringe is 1-2 mm.

In some embodiments, the syringe has a cavity with a proximal opening, and the first stopper is arranged on the inner wall of the syringe near the opening end;

The push rod includes a push rod body and a piston head arranged at the far 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 second stop rod is arranged adjacent to the piston head.

In some embodiments, the distance between the first stopper and the open end of the syringe is 18-22 mm; and/or the distance between the second stopper and the piston head is 18-22 mm.

In some embodiments, the first blocking rods are provided in two numbers, and the two first blocking rods are arranged opposite to each other on the inner wall of the syringe;

The second blocking rods are provided in two numbers, and the two second blocking rods are arranged opposite to each other on the outer wall of the push rod;

When the push rod is locked, the two first shift rods are correspondingly engaged with the two second shift rods.

In some embodiments, the number of the first blocking rods is three, and the three first blocking rods are evenly arranged on the inner wall of the syringe along the circumference of the syringe;

The second blocking rods are provided in three numbers, and the three second blocking rods are arranged on the outer wall of the push rod along the circumference of the push rod;

When the push rod is locked, the three first shift rods are correspondingly engaged with the three second shift rods.

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.

The negative pressure syringe provided by the present invention comprises a syringe and a push rod, wherein the inner wall of the syringe is provided with a first stop rod, and the outer wall of the push rod is provided with a second stop rod, and the length direction of the first stop rod and the length direction of the second stop rod are at an angle, and during the movement of the push rod, the push rod is rotated until the first stop rod is directly opposite to and is clamped to the second stop rod, so as to lock the push rod on the syringe, so that the suction negative pressure is maintained in the syringe. The push rod is locked on the syringe by the cooperation of the first stop rod and the second stop rod, so that 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, and the locking operation is relatively simple, can be operated by one person, and the locking operation can be repeated.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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.

FIG1 is a schematic structural diagram of an embodiment of a negative pressure injector provided by the present invention;

FIG2 is a schematic cross-sectional view of the negative pressure injector provided by the present invention in a negative pressure locked state;

FIG3 is an enlarged schematic diagram of a local structure of FIG2 ;

FIG4 is a schematic structural diagram of the negative pressure injector provided by the present invention in a negative pressure locking state from another perspective;

FIG5 is a schematic cross-sectional view of the negative pressure injector provided by the present invention in an unlocked state;

FIG6 is a schematic structural diagram of the negative pressure injector provided by the present invention in an unlocked state at another time;

FIG7 is a schematic structural diagram of the syringe in FIG1 from another perspective;

FIG8 is a schematic structural diagram of the syringe in FIG1 from another viewing angle;

FIG. 9 is a schematic structural diagram of the push rod in FIG. 1 from another perspective.

Description of Figure Numbers:

1-syringe; 11-receiving cavity; 12-opening end; 13-Luer interface; 2-push rod; 21-push rod body; 22-piston head; 4-first gear rod; 5-second gear rod.

The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings.

DETAILED DESCRIPTION

The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

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 components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

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

In order 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, the present invention proposes a negative pressure syringe that can be negatively locked, has a simple locking operation, and can maintain a negative pressure state for a long time.

Please refer to Figures 1 to 4. In one embodiment of the present invention, the negative pressure syringe includes a syringe 1 and a push rod 2. The inner wall of the syringe 1 is provided with a first baffle rod 4, and the outer wall of the push rod 2 is provided with a second baffle rod 5. The length direction of the first baffle rod 4 and the length direction of the second baffle rod 5 form an angle. During the movement of the push rod 2, the push rod 2 is rotated until the first baffle rod 4 is opposite to and engaged with the second baffle rod 5, so as to lock the push rod 2 on the syringe 1, so that the suction negative pressure is maintained in the syringe 1.

Specifically, the first stopper 4 and the second stopper 5 are both round rod-shaped, and there is an angle between the length direction of the first stopper 4 and the length direction of the second stopper 5, that is, the first stopper 4 and the second stopper 5 are not arranged in parallel, and the specific angle value is not limited; the material of the first stopper 4 and the second stopper 5 is the same as that of the syringe 1. During the movement of the push rod 2 toward the proximal direction, the first stopper 4 and the second stopper 5 are staggered. When the second stopper 5 is moved to the proximal side of the first stopper 4, the push rod 2 is rotated so that the second stopper 5 is opposite to the first stopper 4, and then the push rod 22 is moved toward the distal direction until the second stopper 5 is clamped to the first stopper 4, so as to lock the push rod 2 on the syringe 1, so that the suction negative pressure in the syringe 1 is maintained for a long time and more stably.

The negative pressure syringe provided by the present invention locks the push rod 2 on the syringe barrel 1 through the cooperation of the first stop rod 4 and the second stop rod 5. 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 aspiration effect. In addition, the locking operation is relatively simple and can be operated by one person, and the locking operation can be repeated.

Please refer to Figures 5, 7 and 9. Optionally, the first stopper 4 is arranged near the proximal end of the syringe 1, and the second stopper 5 is arranged near the distal end of the push rod 2. In this way, a larger negative pressure cavity can be maintained in the syringe 1, and the suction negative pressure is larger.

It should be noted that, referring to Figures 3 to 6, when the push rod 2 is not locked, the second lever 5 and the first lever are misaligned. After the push rod 2 is locked, the push rod 2 can be rotated so that the first lever 4 is disengaged from the second lever 5, thereby achieving unlocking. In the process from locking the push rod 2 to unlocking the push rod 2, the rotation angle of the push rod 2 is not limited, as long as the first lever 4 and the second lever 5 are misaligned after the push rod 2 is rotated, it is within the protection scope of the present invention. If negative pressure is required later, the above locking operation can be repeated.

Referring to Fig. 4, in some embodiments of the present invention, the length direction of the first stopper 4 and the length direction of the second stopper 5 are at an angle of 90°. That is, when the push rod 2 is locked on the syringe 1, the first stopper 4 and the second stopper 5 are arranged vertically, so that the negative pressure syringe can be ensured to have good locking stability and reliability.

Please refer to Figures 4, 7 and 8. In some embodiments of the present invention, the inner cavity of the syringe 1 is cylindrical, and both ends of the first stopper 4 are arc surfaces, and are connected to the inner wall of the syringe 1. In this embodiment, there is a certain gap between the first stopper 4 and the inner wall of the syringe 1, and both ends are connected to the inner wall of the syringe 1. Optionally, the syringe 1 and the first stopper 4 are an integrated structure, and the first stopper 4 has a better stability, which can enhance the locking stability of the negative pressure syringe.

Further, please refer to Figures 4 and 9. In some embodiments of the present invention, the length direction of the second baffle rod 5 is perpendicular to the axial direction of the push rod 2, and the first baffle rod 4 extends along the radial direction of the syringe 1. In this way, when the push rod 2 is locked on the syringe 1, the first baffle rod 4 and the second baffle rod 5 are vertically arranged, which can ensure that the negative pressure syringe has better locking stability and reliability; at the same time, the effective length of the first baffle rod 4 and the second baffle rod 5 is relatively short, which is conducive to processing and manufacturing and reduces costs.

In some embodiments of the present invention, the distance between the end of the second stopper 5 away from the push rod 2 and the inner wall of the syringe 1 is 1-2 mm (such as 1 mm, 1.5 mm, 2 mm and any interval between the two end points). In this embodiment, there is a gap between the end of the second stopper 5 away from the push rod 2 and the inner wall of the syringe 1. In this design, during the movement of the push rod 2, the second stopper 5 will not contact the inner wall of the syringe 1, and thus will not cause resistance to the movement of the push rod 2.

Please refer to Figures 5, 7 and 9. In some embodiments of the present invention, the syringe 1 has a cavity 11 with a proximal opening, and the first stopper 4 is arranged on the inner wall of the syringe 1 near the opening 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 can be movably inserted into the cavity 11, the piston head 22 is in sealing contact with the inner wall of the cavity 11, and the second stopper 5 is arranged near the piston head 22. Such a setting can ensure that the syringe 1 has a larger negative pressure cavity when the push rod 2 is locked, that is, it can ensure that the negative pressure syringe has a larger 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.

In a specific embodiment of the present invention, the distance between the first gear rod 4 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 second gear rod 5 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).

Please refer to Figures 2 to 4. In some embodiments of the present invention, two first baffle rods 4 are provided, and the two first baffle rods 4 are relatively arranged on the inner wall of the syringe 1; two second baffle rods 5 are provided, and the two second baffle rods 5 are relatively arranged on the outer wall of the push rod 2; when the push rod 2 is locked, the two first baffle rods 4 are correspondingly clamped on the two second baffle rods 5.

In this embodiment, the two first baffles 4 extend along the radial direction of the syringe 1 and are arranged oppositely, and the two second baffles 5 extend along the radial direction of the push rod 2 and are arranged oppositely. When the push rod 2 is locked, the two first baffles 4 are correspondingly connected to the two second baffles 5, and the connected first baffles 4 and second baffles 5 are perpendicular to each other, so that the negative pressure syringe can be ensured to have good locking stability. If unlocking is required, the push rod 2 can be rotated 90° to disengage the first baffle 4 and the second baffle 5 to complete the unlocking. If locking is required later, the push rod 2 can be rotated 90° again. In this way, when the locking and unlocking operations are repeated, it can be achieved by rotating the push rod 2 90°.

Of course, when the locking and unlocking operations are repeated, the push rod 2 can be rotated to other angles, as long as the first gear lever 4 and the second gear lever 5 are misaligned when unlocking and the first gear lever 4 and the second gear lever 5 are aligned when locking.

In some embodiments of the present invention, the number of first baffle rods 4 is three, and the three first baffle rods 4 are evenly arranged on the inner wall of the syringe 1 along the circumference of the syringe 1; the number of second baffle rods 5 is three, and the three second baffle rods 5 are 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 three first baffle rods 4 are correspondingly clamped on the three second baffle rods 5.

In this embodiment, the three first baffles 4 extend along the radial direction of the syringe 1 and are evenly distributed along the circumference of the syringe 1. The three second baffles 5 extend along the radial direction of the push rod 2 and are evenly distributed along the circumference of the push rod 2. When the push rod 2 is locked, the three first baffles 4 are correspondingly connected to the three second baffles 5, and the connected first baffles 4 and second baffles 5 are perpendicular to each other. In this way, the negative pressure syringe can be ensured to have good locking stability. If unlocking is required, the push rod 2 can be rotated 60° to disengage the first baffle 4 and the second baffle 5 to complete the unlocking. If locking is required later, the push rod 2 can be rotated 60° again. In this way, when the locking and unlocking operations are repeated, it can be achieved by rotating the push rod 2 60°.

Of course, when the locking and unlocking operations are repeated, the push rod 2 can be rotated to other angles, as long as the first gear lever 4 and the second gear lever 5 are misaligned when unlocking and the first gear lever 4 and the second gear lever 5 are aligned when locking.

Referring to Fig. 2, in some embodiments of the present invention, the distal end of the syringe 11 is provided with a Luer interface 1313, and the inner cavity of the Luer interface 1313 is connected to the inner cavity of the syringe 11. With such a configuration, the Luer interface 1313 can facilitate docking with the Luer connector of other instruments.

The use steps of the negative pressure syringe of the present invention are specifically as follows: in the interventional surgical treatment of thrombus removal, an instrument intervention channel is established in the femoral artery (venous) blood vessel 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 (at this time, the air pressure in the syringe 1 is less than the external atmospheric pressure), and then the push rod 2 is locked on the syringe 1 (the locking method thereof refers to the above embodiment, which will not be repeated here), so that the negative pressure in the syringe 1 is maintained at a substantially constant level until the thrombus is extracted; finally, the catheter is withdrawn from the body, the wound is sutured, and the operation is completed.

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 changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly/indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims (10)

1. A negative pressure syringe, characterized in that the negative pressure syringe comprises a syringe and a push rod, the inner wall of the syringe is provided with a first stopper, the outer wall of the push rod is provided with a second stopper, and the length direction of the first stopper and the length direction of the second stopper form an angle; During the movement of the push rod, the push rod is rotated until the first stop rod is directly opposite to and engaged with the second stop rod, so as to lock the push rod on the syringe, so that the suction negative pressure is maintained in the syringe. 2 . The negative pressure syringe according to claim 1 , wherein the angle between the length direction of the first baffle rod and the length direction of the second baffle rod is 90°. 3. The negative pressure syringe as described in claim 2 is characterized in that the inner cavity of the syringe is cylindrical, and both ends of the first baffle are arc surfaces and are both connected to the inner wall of the syringe. 4. The negative pressure syringe as described in claim 2 is characterized in that the length direction of the second blocking rod is perpendicular to the axial direction of the push rod. 5. The negative pressure syringe according to claim 4, characterized in that the distance between the end of the second blocking rod away from the push rod and the inner wall of the syringe is 1-2 mm. 6. The negative pressure syringe according to claim 1, characterized in that the syringe has a cavity with a proximal opening, and the first blocking rod is arranged on the inner wall of the syringe near the opening end; The push rod includes a push rod body and a piston head arranged at the far 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 second stop rod is arranged adjacent to the piston head. 7. The negative pressure syringe according to claim 6, characterized in that the distance between the first stopper and the open end of the syringe is 18-22 mm; and/or, The distance between the second gear rod and the piston head is 18-22 mm. 8. The negative pressure injector according to any one of claims 1 to 7, characterized in that the first baffles are provided in pairs, and the two first baffles are arranged opposite to each other on the inner wall of the syringe; The second blocking rods are provided in two numbers, and the two second blocking rods are arranged opposite to each other on the outer wall of the push rod; When the push rod is locked, the two first shift rods are correspondingly engaged with the two second shift rods. 9. The negative pressure injector according to any one of claims 1 to 7, characterized in that three first baffles are provided, and the three first baffles are evenly arranged on the inner wall of the syringe along the circumference of the syringe; The second blocking rods are provided in three numbers, and the three second blocking rods are arranged on the outer wall of the push rod along the circumference of the push rod; When the push rod is locked, the three first shift rods are correspondingly engaged with the three second shift rods. 10. The negative pressure syringe according to any one of claims 1 to 7, characterized in that the distal end of the syringe is provided with a Luer interface, and the inner cavity of the Luer interface is connected to the inner cavity of the syringe.