Locking device for a negative pressure syringe

Abstract

The application discloses a locking device of a negative pressure injector, which comprises a fixing ring and a positioning ring, the fixing ring is used for locking the part of a piston rod, which extends out of a syringe barrel, and the syringe barrel together, and the inner wall of the fixing ring is provided with buckles which are buckled and connected with the clamping grooves of the piston rod; the positioning ring is in a disc structure, and the positioning ring is provided with a plurality of through holes. The locking device of the negative pressure injector is suitable for single-person operation, is convenient to use, and can lock the negative pressure cavity and the syringe barrel together through the fixing ring, so that the plug rod cannot be pushed by the negative pressure after the negative pressure cavity is punctured, and the continuous negative pressure can be maintained.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a locking device for a negative pressure injector. Background Technology

[0002] In thyroid biopsy procedures, the needle is inserted into the target location with the aid of ultrasound. Then, the negative pressure of the syringe is used to draw tissue into the needle. The needle is then pulled out of the body, and the tissue is pushed out through the syringe to obtain the tissue for biopsy.

[0003] However, biopsies are typically performed by a single doctor, who needs to hold the ultrasound probe with one hand and can only use the other to perform the puncture and aspiration. Furthermore, the negative pressure operation of the syringe requires pulling out the syringe plunger, making it inconvenient to operate both the puncture needle and syringe with one hand simultaneously.

[0004] Furthermore, the required negative pressure for different sites during negative pressure tissue aspiration is not the same. Too little negative pressure may result in insufficient tissue aspiration, while too much negative pressure may cause additional harm to the patient. Summary of the Invention

[0005] In view of this, the present invention proposes a locking device for a negative pressure syringe, which is suitable for single-person operation and easy to use. The negative pressure chamber is locked together with the syringe barrel by a fixing ring, so that after the negative pressure chamber is punctured, the plunger will not be pushed by the negative pressure, thus maintaining continuous negative pressure.

[0006] This invention provides the following technical solution:

[0007] A locking device for a negative pressure injector includes a fixing ring and a positioning ring. The fixing ring is used to lock the portion of the piston rod extending out of the syringe barrel to the syringe barrel. The inner wall of the fixing ring is provided with a buckle that engages with the groove of the piston rod. The positioning ring has a disc-shaped structure and is provided with multiple through holes.

[0008] Optionally, when the piston rod has multiple negative pressure chambers, the negative pressure chambers pass through the positioning ring, and the positioning ring is used to fix the multiple negative pressure chambers together.

[0009] Optionally, multiple through holes are connected in sequence to form an axisymmetric image.

[0010] Optionally, the retaining ring is provided with at least one set of fractures to facilitate opening the retaining ring.

[0011] Optionally, the fixing ring is a cylindrical structure with openings at both ends.

[0012] Optionally, each set of fractured portions includes two recesses with opposite opening directions, and a fracture block connecting the bottom of the two recesses is located between them.

[0013] Optionally, the two recesses are located at the two ends of the fixing ring, respectively.

[0014] Optionally, the recess is V-shaped, arc-shaped, or square.

[0015] Optionally, the fracture block is a fracture-prone elastic body.

[0016] According to the technical solution of the present invention, when the negative pressure syringe is used for puncture surgery, the fixing ring locks the part of the piston rod that extends out of the syringe barrel together with the syringe barrel. The fixing ring only restricts the movement of the negative pressure cavity to the front end to reduce the risk of unsuccessful puncture, and does not affect the retraction of the negative pressure cavity. After the puncture needle aspirates the tissue in the target area, the puncture needle is pulled out, the fixing ring is opened, and then the piston rod is pushed to push out the tissue in the puncture needle, which can be used for biopsy. Attached Figure Description

[0017] For illustrative and not limiting purposes, the invention will now be described with reference to preferred embodiments thereof, particularly the accompanying drawings, in which:

[0018] Figure 1 This is a schematic diagram of the negative pressure injector provided by the present invention.

[0019] Figure 2 This is an exploded structural diagram of the negative pressure injector provided by the present invention.

[0020] Figure 3 This is a schematic diagram of the negative pressure injector provided by the present invention.

[0021] Figure 4 This is a schematic diagram of the trigger rod provided by the present invention.

[0022] Figure 5 This is a schematic diagram of the structure of the fixing ring provided by the present invention.

[0023] In the attached image:

[0024] 1-Injection cylinder, 2-Fixing part, 3-Negative pressure chamber, 4-Trigger rod, 5-Airflow channel, 6-Sealing ring, 7-Positioning ring, 8-Fixing ring, 9-Handle, 10-Handheld part, 11-Flexible rubber part, 12-Conical assembly, 13-Slot, 14-Snap, 15-Break block, 16-Recess. Detailed Implementation

[0025] The following description, in conjunction with the accompanying drawings, illustrates exemplary embodiments of the present invention, including various details to aid understanding. These details should be considered merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the invention. Similarly, for clarity and brevity, descriptions of well-known functions and structures are omitted in the following description.

[0026] like Figures 1 to 5 As shown, the negative pressure injector in this embodiment of the invention includes an injection cylinder 1, a piston rod, and a locking device for the negative pressure injector. The locking device includes a fixing ring 8 and a positioning ring 7. The piston rod portion is located inside the injection cylinder 1, and its portion extending out of the injection cylinder 1 is fixedly connected to the injection cylinder 1 via the fixing ring 8. The piston rod includes a fixing part 2, one or more negative pressure chambers 3, and a trigger rod 4 within the negative pressure chamber. The negative pressure chamber 3 is disposed on the fixing part 2, and the negative pressure chamber 3 seals the trigger rod 4, with the first end of the trigger rod 4 extending out of the negative pressure chamber 3 along its axial direction. The fixing part 2 may be provided with multiple connecting parts, which fix the negative pressure chamber 3 to the fixing part 2. In this invention, the number of negative pressure chambers 3 can be determined according to the actual required amount of negative pressure. Moreover, the pressure in each negative pressure chamber 3 can be different or the same.

[0027] In this embodiment, the piston rod is locked together with the syringe 1 by the fixing ring 8, so that after the trigger rod 4 punctures the negative pressure chamber 3, the piston rod will not be pushed by the negative pressure, thereby maintaining a continuous negative pressure.

[0028] When performing a puncture procedure, the negative pressure syringe connects the puncture needle to the front end of the syringe 1, inserts the puncture needle into the target area, and then presses the trigger rod 4 as needed. The trigger rod 4 punctures the fixing part 2, and the negative pressure chamber 3 communicates with the front end space of the syringe 1, so that the syringe 1 has a corresponding negative pressure, thereby allowing the puncture needle to aspirate tissue from the target area. Afterwards, the puncture needle is pulled out, the fixing ring 8 is opened, and then the piston rod is pushed to push out the tissue inside the puncture needle, which can be used for biopsy.

[0029] When there are multiple negative pressure chambers 3, the positioning ring 7 is used to fix the multiple negative pressure chambers 3 together. The multiple negative pressure chambers 3 can be parallel to each other. Figure 2 As shown, when there are three negative pressure cavities 3, the three negative pressure cavities 3 are parallel to each other, and the cross-sections of the three negative pressure cavities 3 form a triangle. The negative pressure cavities 3 are tubular structures, and the cross-sections of the negative pressure cavities 3 can be regular shapes (e.g., circular) or irregular shapes.

[0030] The negative pressure chamber 3 has a first end and a second end. The second end of the negative pressure chamber 3 is close to the front end of the syringe 1 and is fixed to the fixing part 2. The first end of the negative pressure chamber 3 is close to the fixing ring 8. The positioning ring 7 has a disc-shaped structure and multiple through holes. The first end of the negative pressure chamber 3 passes through the positioning ring 7. The multiple through holes are connected in sequence to form an axisymmetric image.

[0031] The syringe 1 has a front end and a rear end. The front end of the syringe 1 is used to install the puncture needle, and the rear end is used for holding. That is, the rear end of the syringe 1 is the first end of the syringe 1. The first end of the syringe 1 is provided with a handle 10, which surrounds the wall of the syringe 1. When the positioning ring 7 enters the syringe 1, the positioning ring 7 is close to the first end of the syringe 1. The negative pressure cavity 3 is provided with a groove 13 on the side wall near the first end of the syringe. The inner wall of the fixing ring 8 is provided with a buckle 14 that engages with the groove 13. The engagement of the groove 13 and the buckle 14 locks the syringe 1 and the negative pressure cavity 3 together. After the fixing ring 8 is fitted onto the negative pressure cavity 3, it abuts against the handle 10 of the syringe 1, thereby preventing the negative pressure cavity 3 from moving forward. The fixing ring 8 only restricts the forward movement of the negative pressure cavity 3 and does not affect the backward movement of the negative pressure cavity 3. The fixing ring 8 can also be connected to the handle 10.

[0032] The trigger rod 4 has a first end and a second end. The first end of the trigger rod 4 has a handle 9, which extends out of the fixing ring 8. The handle 9 is used to facilitate the doctor to push the trigger rod 4 so that the second end of the trigger rod 4 can pierce the fixing part 2. The shape of the handle 9 can be any shape, such as a disc, as long as it can achieve the function in this application.

[0033] A flexible rubber component 11 is provided on the trigger rod 4. The flexible rubber component 11 is used to seal the portion of the trigger rod 4 located inside the negative pressure chamber 3. The flexible rubber component 11 can be a rubber ring, which is fitted onto the trigger rod 4 and enters the negative pressure chamber 3 along with the trigger rod 4. The negative pressure chamber 3 is a hollow structure with openings at both ends. The first end of the negative pressure chamber 3 is sealed by the flexible rubber component 11, and the second end of the negative pressure chamber 3 is sealed by the fixing part 2.

[0034] The second end of the trigger rod 4 is located inside the negative pressure chamber 3 near the fixed part 2, and the second end of the trigger rod 4 has a conical component 12, on which multiple airflow channels 5 are arranged axially. When the conical component 12 pierces the fixed part 2, the front end of the syringe 1 communicates with the negative pressure chamber 3 through the airflow channels 5, so that the syringe 1 has a corresponding negative pressure, and thus the puncture needle can draw the target tissue into the puncture needle under the action of negative pressure.

[0035] The conical component 12 can be conical or pyramidal, and the direction of the airflow channel 5 can be parallel to the axis of the conical component 12.

[0036] A sealing ring 6 is provided on the outer periphery of the fixing part 2 to seal the inner wall of the syringe 1, so as to reduce the risk of air leakage of the syringe 1 during puncture.

[0037] The retaining ring 8 has at least one set of fracture portions to facilitate opening the retaining ring 8. The retaining portion 2 is made of an elastic material. Figure 5 As shown, the fixing ring 8 is a hollow cylindrical structure with openings at both ends. Multiple sets of fracture sections are provided on the wall of the fixing ring 8. Each set of fracture sections includes two recesses 16 with opposite opening directions. A fracture block 15 connects the bottom of the two recesses 16, meaning the two recesses 16 are connected by the fracture block 15. The two recesses 16 are located at opposite ends of the fixing ring 8, and the recesses 16 can be V-shaped, arc-shaped, or square. The fracture block 15 is a easily fractured elastic body. After the puncture needle aspirates tissue, it is pulled out. Then, by tearing the fracture block 15, the wall of the fixing ring 8 is broken, and the fixing ring 8 is removed from the negative pressure syringe. The piston rod can move relative to the syringe barrel 1, and then the piston rod is pushed to push out the tissue inside the puncture needle.

[0038] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can occur depending on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A locking device for a negative pressure injector, characterized in that, It includes a retaining ring and a positioning ring. The retaining ring is used to lock the part of the piston rod that extends out of the syringe barrel to the syringe barrel. The inner wall of the retaining ring is provided with a buckle that engages with the groove of the piston rod. The positioning ring has a disc-shaped structure and multiple through holes. When the piston rod has multiple negative pressure cavities, the negative pressure cavities pass through the positioning ring, and the positioning ring is used to fix the multiple negative pressure cavities together.

2. The locking device for the negative pressure injector according to claim 1, characterized in that, Multiple through holes are connected in sequence to form an axisymmetric image.

3. The locking device for the negative pressure injector according to claim 1, characterized in that, The retaining ring is provided with at least one set of fractures to facilitate opening the retaining ring.

4. The locking device for the negative pressure injector according to claim 3, characterized in that, The fixing ring is a cylindrical structure with openings at both ends.

5. The locking device for the negative pressure injector according to claim 3 or 4, characterized in that, Each set of fractured portions includes two recesses with opposite opening directions, and a fracture block connecting the bottom of the two recesses is located between them.

6. The locking device for the negative pressure injector according to claim 5, characterized in that, The two recessed portions are located at the two ends of the fixing ring, respectively.

7. The locking device for the negative pressure injector according to claim 5, characterized in that, The recess is V-shaped, arc-shaped, or square.

8. The locking device for the negative pressure injector according to claim 5, characterized in that, The fractured block is an easily fractured elastic body.

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