CN116327261A - a negative pressure syringe - Google Patents

Abstract

The invention discloses a negative pressure injector, which comprises a syringe, a piston rod and a fixing ring. The piston rod is partly located in the syringe, and the part protruding from the syringe is fixedly connected to the piston rod and the syringe through the fixing ring; The rod includes a fixed part, one or more negative pressure chambers and a trigger rod in the negative pressure chamber, the second end of the negative pressure chamber is arranged on the fixed part, the sealing part of the negative pressure chamber triggers the rod, and the first end of the trigger rod One end extends out of the negative pressure cavity along the axial direction of the negative pressure cavity. When performing a puncture operation on a negative pressure syringe, connect the puncture needle to the front end of the syringe, insert the puncture needle into the target area, and then press the trigger lever as needed, the trigger lever pierces the fixed part, and the space between the negative pressure cavity and the front end of the syringe barrel Connected, so that the syringe has a corresponding negative pressure, so that the puncture needle absorbs the tissue in the target area, then pulls out the puncture needle, opens the fixing ring, and then pushes the piston rod to push out the tissue in the puncture needle, and the tissue can be biopsied.

Description

a negative pressure syringe

technical field

The invention relates to the technical field of medical instruments, in particular to a negative pressure injector.

Background technique

In biopsy operations such as the thyroid gland, it is necessary to puncture the puncture needle to the target position with the assistance of ultrasound, and then rely on the negative pressure of the syringe to suck the tissue into the puncture needle, then pull the puncture needle out of the human body, and push the tissue out of the puncture needle through the syringe , to obtain tissue to complete the biopsy.

However, the biopsy process is usually performed by a single doctor. One hand of the doctor needs to hold the ultrasound probe, and the other hand can only complete the puncture and suction. However, the negative pressure operation of the syringe needs to pull out the plunger of the syringe, and it is inconvenient to operate the puncture needle and the syringe simultaneously with one hand.

In addition, when absorbing tissue with negative pressure, the negative pressure required for different parts is also the same. If the negative pressure is too small, the tissue absorbed may not be enough, and if the negative pressure is too large, it may cause additional damage to the patient.

Contents of the invention

In view of this, the present invention proposes a negative pressure injector, which is suitable for single-person operation and is easy to use, and the number of negative pressure cavities can be determined according to the amount of negative pressure actually required, and the negative pressure cavities and The syringes are locked together so that after puncturing the living negative pressure cavity, the stopper rod will not be pushed by the negative pressure and can maintain a continuous negative pressure.

The present invention provides following technical scheme:

A negative pressure syringe, comprising a syringe, a piston rod and a fixing ring, wherein: the piston rod part is located in the syringe, and the part protruding from the syringe is fixed to the syringe through the fixing ring connected together; the piston rod includes a fixed part, one or more negative pressure chambers and a trigger rod in the negative pressure chamber, the negative pressure chamber is arranged on the fixed part, and the negative pressure chamber is sealed part of 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.

Optionally, when there are multiple negative pressure cavities, the negative pressure injector further has a positioning ring, and the positioning ring is used to fix the multiple negative pressure cavities together.

Optionally, the positioning ring is provided with a plurality of through holes, the first end of the negative pressure cavity passes through the positioning ring, and the second end is fixed on the fixing part.

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 close to the first end of the syringe is provided with a slot , the inner wall of the fixing ring is provided with a snap-fit connection with the snap-in groove.

Optionally, a flexible rubber member is provided on the trigger rod, and the flexible rubber member is used to seal a part of the trigger rod located in the negative pressure chamber.

Optionally, the first end of the trigger lever has a handle, and the handle extends out of the fixing ring.

Optionally, the second end of the trigger rod is located at one end of the negative pressure chamber close to the fixed part, and the second end of the trigger rod has a conical assembly, and the conical assembly is arranged axially There are multiple airflow channels.

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

Optionally, at least one breaking portion is provided on the fixing ring to facilitate opening of the fixing ring.

Optionally, the fixing part is made of elastic material; the negative pressure chamber is a hollow structure with two ends open, wherein the first end is sealed by the flexible rubber part, and the second end is sealed by the fixing part.

According to the technical solution of the present invention, when the negative pressure injector is performing a puncture operation, the puncture needle is connected to the front end of the syringe, the puncture needle is inserted into the target area, and then the trigger lever is pressed as needed, the trigger lever punctures the fixed part, and the negative pressure The cavity communicates with the space at the front end of the syringe, so that the syringe has negative pressure, so that the puncture needle absorbs the tissue in the target area, then pulls out the puncture needle, opens the fixing ring, and then pushes the piston rod to push out the tissue in the puncture needle. A biopsy may be performed.

Description of drawings

For purposes of illustration and not limitation, the invention will now be described according to its preferred embodiments, particularly with reference to the accompanying drawings, in which:

Fig. 1 is a structural schematic diagram of a negative pressure injector provided by the present invention.

Fig. 2 is a schematic diagram of the exploded structure of the negative pressure injector provided by the present invention.

Fig. 3 is a schematic structural view of the negative pressure injector provided by the present invention.

Fig. 4 is a structural schematic diagram of the trigger lever provided by the present invention.

Fig. 5 is a schematic structural view of the fixing ring provided by the present invention.

In the attached picture:

1-Injection barrel, 2-Fixed part, 3-Negative pressure chamber, 4-Trigger lever, 5-Air flow channel, 6-Sealing ring, 7-Location ring, 8-Fixed ring, 9-Handle, 10-Handle , 11-flexible rubber piece, 12-tapered component, 13-slot, 14-buckle.

Detailed ways

Exemplary embodiments of the present invention are described below in conjunction with the accompanying drawings, which include various details of the embodiments of the present invention to facilitate understanding, and they should be regarded as exemplary only. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the invention. Also, descriptions of well-known functions and constructions are omitted in the following description for clarity and conciseness.

As shown in Figures 1 to 5, the negative pressure injector in the embodiment of the present invention includes a syringe 1, a piston rod and a fixing ring 8, the piston rod part is located in the syringe 1, and the part protruding from the syringe 1 passes through the fixing ring 8 is fixedly connected with the syringe 1; the piston rod includes a fixed part 2, one or more negative pressure chambers 3 and 4 in the negative pressure chamber, the negative pressure chamber 3 is arranged on the fixed part 2, and the negative pressure chamber 3 sealing the trigger rod 4, and the first end of the trigger rod 4 extends out of the negative pressure cavity 3 along the axial direction of the negative pressure cavity 3.

The fixing part 2 may be provided with a plurality of connecting parts, and the negative pressure chamber 3 is fixed on the fixing part 2 through the connecting parts. The number of negative pressure chambers 3 can be determined according to the amount of negative pressure actually 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 active negative pressure chamber 3, the piston rod will not be pushed by the negative pressure, thereby maintaining a continuous negative pressure.

When performing a puncture operation on a negative pressure syringe, connect the puncture needle to the front end of the syringe 1, pierce the puncture needle into the target area, and then press the trigger lever 4 as needed, the trigger lever 4 pierces the fixed part 2, and the negative pressure cavity 3 It communicates with the space at the front end of the syringe 1, so that the syringe 1 has a corresponding negative pressure, so that the puncture needle absorbs the tissue in the target area, then pulls out the puncture needle, opens the fixing ring 8, and then pushes the piston rod to push out the tissue in the puncture needle , the tissue can be biopsied.

When there are multiple negative pressure cavities 3, the negative pressure injector also has a positioning ring 7, which is used to fix the multiple negative pressure cavities 3 together. Multiple negative pressure chambers 3 can be parallel to each other. As shown in FIG. 2 , when the number of negative pressure chambers 3 is three, the three negative pressure chambers 3 are parallel to each other, and the cross sections of the three negative pressure chambers 3 form a triangle. The negative pressure cavity 3 is a tubular structure, and the cross section of the negative pressure cavity 3 can be a regular figure (such as a circle), or an irregular figure.

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 the second end of the negative pressure chamber 3 is fixed on the fixed part 2, the negative pressure chamber The first end of the body 3 is close to the fixing ring 8 . The positioning ring 7 is a disc-shaped structure, and the positioning ring 7 is provided with a plurality of through holes, and the first end of the negative pressure cavity 3 passes through the positioning ring 7 .

The syringe 1 has a front end and a rear end, the front end of the syringe 1 is used for installing a puncture needle, and the rear end of the syringe 1 is used for hand-holding, that is, the rear end of the syringe 1 is the first end of the syringe 1, and the A handle 10 is provided at the first end, and the handle 10 surrounds the barrel wall of the injection barrel 1 . When the positioning ring 7 enters the injection cylinder 1, the positioning ring 7 is close to the first end of the injection cylinder 1; There is a buckle 14 snap-fitted with the buckle 13 , and the injection barrel 1 is locked with the negative pressure chamber 3 through the cooperation of the slot 13 and the buckle 14 . The fixed ring 8 is sleeved behind the negative pressure cavity 3, through which it abuts against the handle 10 of the injection barrel 1, thereby preventing the negative pressure cavity 3 from moving forward. The fixed ring 8 only restricts the negative pressure cavity 3 from moving forward. Movement does not affect the retreat of the negative pressure chamber 3. The fixing ring 8 can also be connected with the handle 10 .

The trigger lever 4 has a first end and a second end, the first end of the trigger lever 4 has a handle 9 protruding from the fixing ring 8 . The handle 9 is used to facilitate the doctor to push the trigger lever 4 so that the second end of the trigger lever 4 can pierce the fixing part 2. The shape of the handle 9 can be any shape, such as a round cake shape, as long as the function in this application can be realized That's it.

A flexible rubber part 11 is arranged on the trigger rod 4 , and the flexible rubber part 11 is used to seal part of the trigger rod 4 located in the negative pressure chamber 3 . The flexible rubber part 11 can be a rubber ring, which is sleeved on the trigger rod 4 , and the rubber ring 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 a flexible rubber member 11 , and the second end of the negative pressure chamber 3 is sealed by the fixing part 2 .

The second end of the trigger rod 4 is located at the end of the negative pressure cavity 3 close to the fixed part 2, and the second end of the trigger rod 4 has a conical assembly 12, and a plurality of airflow channels are arranged in the axial direction on the conical assembly 12 5. After the tapered assembly 12 pierces the fixing part 2, the front end of the syringe 1 communicates with the negative pressure cavity 3 through the airflow channel 5, so that the syringe 1 has a corresponding negative pressure, so that the puncture needle can Aspirate the target tissue into the needle.

The cone assembly 12 may be conical or pyramid-shaped, and the direction of the air flow channel 5 may be parallel to the axis of the cone assembly 12 .

A sealing ring 6 for sealing the inner wall of the syringe 1 is arranged on the outer periphery of the fixing part 2 to reduce the risk of air leakage of the syringe 1 during puncturing.

At least one breaking portion is provided on the fixing ring 8 to facilitate the opening of the fixing ring 8 . The fixing part 2 is made of elastic material. As shown in Figure 5, the fixed ring 8 is a hollow cylinder with open ends, and the wall of the fixed ring 8 is provided with multiple sets of breaks, each set of breaks includes two grooves and a connection between the two grooves. block, the two grooves are connected by a connecting block, the two grooves are located at the two ends of the fixed ring 8 respectively, and the grooves can be V-shaped grooves or square grooves. The connecting block is an elastic body that is easy to break. After the puncture needle absorbs the tissue, pull out the puncture needle, and then tear the connecting block to destroy the wall of the fixing ring 8, remove the fixing ring 8 from the negative pressure syringe, and the piston rod It can move relative to the syringe 1, and then push the piston rod to push out the tissue in the puncture needle.

The above specific implementation methods do not constitute a limitation to the protection scope of the present invention. It should be apparent to those skilled in the art that various modifications, combinations, sub-combinations and substitutions may occur depending on design requirements and other factors. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. A negative pressure injector, is characterized in that, comprises syringe, piston rod and retaining ring, wherein: The piston rod part is located in the syringe, and the part protruding from the syringe is fixedly connected with the syringe through the fixing ring; The piston rod includes a fixed part, one or more negative pressure chambers and a trigger rod in the negative pressure chamber, the negative pressure chamber is arranged on the fixed part, and the negative pressure chamber seals part of the trigger rod. 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 the number of the negative pressure chambers is multiple, the negative pressure injector also has a positioning ring, and the positioning ring is used to place multiple The negative pressure chambers are fixed together. 3. The negative pressure syringe according to claim 2, wherein the positioning ring is provided with a plurality of through holes, the first end of the negative pressure chamber passes through the positioning ring, and the second end is fixed on the on the fixed part. 4. The negative pressure syringe according to claim 2, wherein 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 chamber close to 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 is snap-fitted with the slot. 5 . The negative pressure injector according to claim 3 , wherein a flexible rubber member is provided on the trigger rod, and the flexible rubber member is used to seal a part of the trigger rod located in the negative pressure cavity. 6 . 6 . The negative pressure injector according to claim 1 , wherein the first end of the trigger lever has a handle, and the handle extends out of the fixing ring. 7. The negative pressure syringe according to claim 1, wherein the second end of the trigger rod is located at the end of the negative pressure cavity close to the fixed part, and the second end of the trigger rod has a tapered Assemblies, a plurality of air flow passages are arranged axially on the conical assembly. 8 . The negative pressure syringe according to claim 1 , wherein a sealing ring for sealing the inner wall of the syringe is provided on the outer periphery of the fixing part. 9 . 9. The negative pressure injector according to claim 1, characterized in that at least one breaking portion is provided on the fixing ring to facilitate opening of the fixing ring. 10. The negative pressure syringe according to claim 5, wherein the fixing part is made of elastic material; the negative pressure cavity is a hollow structure with two ends open, wherein the first end passes through the flexible rubber The part is sealed, and the second end is sealed by the fixing part.

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