A negative pressure syringe

Abstract

The application discloses a negative pressure injector, which comprises a syringe barrel, a piston rod and a fixing ring, the piston rod is partially located in the syringe barrel, and the part of the piston rod extending out of the syringe barrel is fixedly connected with the syringe barrel through the fixing ring; the piston rod comprises a fixed part, one or more negative pressure cavities and a trigger rod in the negative pressure cavities, the second end of the negative pressure cavity is arranged on the fixed part, the negative pressure cavity is sealed with the trigger rod, and the first end of the trigger rod extends out of the negative pressure cavity along the axial direction of the negative pressure cavity. When the negative pressure injector is used for puncture operation, the puncture needle is connected to the front end of the syringe barrel, the puncture needle is stuck into a target area, then the trigger rod is pressed according to needs, the trigger rod pierces the fixed part, the negative pressure cavity is in space communication with the front end of the syringe barrel, so that the syringe barrel has corresponding negative pressure, and then the puncture needle sucks the tissue in the target area, after that, the puncture needle is pulled out, the fixing ring is opened, and then the piston rod is pushed to push the tissue in the puncture needle out, and the tissue can be used for biopsy.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to 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 negative pressure injector that is suitable for single-person operation and is easy to use. Moreover, the number of negative pressure chambers can be determined according to the actual amount of negative pressure required. The negative pressure chambers are locked together with the syringe by a fixing ring, so that after the live 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 negative pressure injector includes an injection barrel, a piston rod, and a retaining ring, wherein: a portion of the piston rod is located inside the injection barrel, and a portion of the piston rod extending out of the injection barrel is fixedly connected to the injection barrel via the retaining ring; the piston rod includes a fixing part, one or more negative pressure chambers, and a trigger rod within the negative pressure chambers, the negative pressure chambers being disposed on the fixing part, the negative pressure chambers sealingly containing the trigger rod, and a first end of the trigger rod extending axially out of the negative pressure chamber.

[0008] Optionally, when there are multiple negative pressure chambers, the negative pressure injector also has a positioning ring for fixing the multiple negative pressure chambers together.

[0009] Optionally, the positioning ring is provided with multiple through holes, the first end of the negative pressure cavity passes through the positioning ring, and the second end is fixed to the fixing part.

[0010] Optionally, when the positioning ring enters the syringe, the positioning ring is close to the first end of the syringe; the side wall of the negative pressure cavity near the first end of the syringe is provided with a slot, and the inner wall of the fixing ring is provided with a buckle that engages with the slot.

[0011] Optionally, a flexible rubber component is provided on the trigger rod, which is used to seal the portion of the trigger rod located within the negative pressure cavity.

[0012] Optionally, the first end of the trigger rod has a handle, and the handle extends out of the retaining ring.

[0013] Optionally, the second end of the trigger rod is located in the negative pressure cavity near the fixed part, and the second end of the trigger rod has a tapered assembly with multiple airflow channels arranged axially on the tapered assembly.

[0014] Optionally, a sealing ring for sealing the inner wall of the syringe is provided on the outer periphery of the fixing part.

[0015] Optionally, the retaining ring is provided with at least one fracture portion to facilitate opening the retaining ring.

[0016] Optionally, the fixing part is made of an elastic material; the negative pressure cavity is a hollow structure with openings at both ends, wherein the first end is sealed by the flexible rubber part and the second end is sealed by the fixing part.

[0017] According to the technical solution of the present invention, when performing a puncture surgery, the negative pressure syringe connects the puncture needle to the front end of the syringe, inserts the puncture needle into the target area, and then presses the trigger rod as needed. The trigger rod punctures the fixing part, and the negative pressure cavity communicates with the space at the front end of the syringe, so that the syringe has negative pressure, thereby the puncture needle aspirates the tissue in the target area. Afterwards, 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

[0018] For illustrative and not limiting purposes, the invention will now be described with reference to preferred embodiments thereof, particularly the accompanying drawings, in which:

[0019] Figure 1 This is a schematic diagram of the negative pressure injector provided by the present invention.

[0020] Figure 2 This is an exploded structural diagram of the negative pressure injector provided by the present invention.

[0021] Figure 3 This is a schematic diagram of the negative pressure injector provided by the present invention.

[0022] Figure 4This is a schematic diagram of the trigger rod provided by the present invention.

[0023] Figure 5 This is a schematic diagram of the structure of the fixing ring provided by the present invention.

[0024] In the attached image:

[0025] 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 fastener. Detailed Implementation

[0026] 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.

[0027] like Figures 1 to 5 As shown, the negative pressure syringe in this embodiment of the invention includes an injection barrel 1, a piston rod, and a retaining ring 8. The piston rod is located inside the injection barrel 1, and the part of the piston rod extending out of the injection barrel 1 is fixedly connected to the injection barrel 1 through the retaining ring 8. The piston rod includes a fixing part 2, one or more negative pressure chambers 3, and a trigger rod 4 inside the negative pressure chamber. The negative pressure chamber 3 is disposed on the fixing part 2. The negative pressure chamber 3 seals the trigger rod 4, and the first end of the trigger rod 4 extends out of the negative pressure chamber 3 along the axial direction of the negative pressure chamber 3.

[0028] Multiple connecting parts can be provided on the fixing part 2 to fix the negative pressure chamber 3 to the fixing part 2. The number of negative pressure chambers 3 can be determined according to the actual amount of negative pressure required, and the pressure in each negative pressure chamber 3 can be different or the same. The piston rod and the syringe 1 can be locked together 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.

[0029] 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.

[0030] When there are multiple negative pressure chambers 3, the negative pressure injector also has a positioning ring 7, which 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] The retaining ring 8 has at least one break to facilitate opening it. The retaining part 2 is made of an elastic material. Figure 5 As shown, the fixing ring 8 is a hollow cylinder with open ends. Multiple sets of fracture sections are provided on the wall of the fixing ring 8. Each set of fracture sections includes two grooves and a connecting block located between the two grooves. The two grooves are connected by the connecting block. The two grooves are located at opposite ends of the fixing ring 8. The grooves can be V-shaped or square. The connecting block is a fragile elastic body. After the puncture needle aspirates tissue, it is pulled out. Then, by tearing the connecting block, 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. Then, by pushing the piston rod, the tissue inside the puncture needle is pushed out.

[0039] 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 negative pressure injector, characterized in that, Includes a syringe, piston rod, and retaining ring, wherein: The piston rod portion is located inside the injection barrel, and its portion extending out of the injection barrel is fixedly connected to the injection barrel via the retaining ring; The piston rod includes a fixed part, one or more negative pressure chambers, and a trigger rod inside the negative pressure chamber. The negative pressure chamber is disposed on the fixed part, the negative pressure chamber seals the trigger rod, and the first end of the trigger rod extends out of the negative pressure chamber along the axial direction of the negative pressure chamber.

2. The negative pressure injector according to claim 1, characterized in that, When there are multiple negative pressure chambers, the negative pressure injector also has a positioning ring, which is used to fix the multiple negative pressure chambers together.

3. The negative pressure injector according to claim 2, characterized in that, The positioning ring is provided with multiple through holes, the first end of the negative pressure cavity passes through the positioning ring, and the second end is fixed to the fixing part.

4. The negative pressure injector according to claim 2, characterized in that, When the positioning ring enters the injection barrel, the positioning ring is close to the first end of the injection barrel; The negative pressure chamber has a slot on the side wall near the first end of the syringe, and the inner wall of the fixing ring has a buckle that engages with the slot.

5. The negative pressure injector according to claim 3, characterized in that, A flexible rubber component is provided on the trigger rod, which is used to seal the part of the trigger rod located in the negative pressure cavity.

6. The negative pressure injector according to claim 1, characterized in that, The first end of the trigger rod has a handle, and the handle extends out of the retaining ring.

7. The negative pressure injector according to claim 1, characterized in that, The second end of the trigger rod is located in the negative pressure cavity near the fixed part, and the second end of the trigger rod has a tapered component, on which multiple airflow channels are arranged axially.

8. The negative pressure injector according to claim 1, characterized in that, A sealing ring for sealing the inner wall of the syringe is provided on the outer periphery of the fixing part.

9. The negative pressure injector according to claim 1, characterized in that, The retaining ring has at least one fracture portion to facilitate opening the retaining ring.

10. The negative pressure injector according to claim 5, characterized in that, The fixing part is made of elastic material; the negative pressure cavity is a hollow structure with openings at both ends, wherein the first end is sealed by the flexible rubber part and the second end is sealed by the fixing part.

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