Auxiliary empty needle suction device for amniotic fluid puncture

Abstract

The utility model relates to the technical field of medical auxiliary instruments, in particular to an empty needle auxiliary suction device for amniotic fluid puncture, which comprises a support arm, a connecting seat and a drawing mechanism, the connecting seat is arranged at the free end of the support arm, and the drawing mechanism is arranged at the bottom of the connecting seat; the drawing mechanism comprises a fixed body and a movable body which are oppositely arranged, a mounting cavity is formed in the fixed body, a suction assembly is arranged in the mounting cavity, and the suction assembly is connected with a piston rod of the injector and used for upwards drawing the piston rod; the opposite side walls of the fixed body and the movable body are each provided with a clamping groove used for being connected with a lug plate on the upper portion of an injector barrel. The movable body is arranged on the connecting base in a sliding mode, an elastic piece is further arranged on the connecting base, and the elastic piece is connected with the movable body and used for pushing the movable body to move in the direction of the fixed body. The fixing device can solve the technical problems that an existing fixing device is inconvenient to disassemble and assemble an injector quickly and cannot be suitable for injectors of different specifications.

Description

Technical Field

[0001] The utility model relates to the technical field of medical auxiliary instruments, in particular to an empty needle assisted aspiration device for amniocentesis. Background Technique

[0002] Amniocentesis, also known as "amniotic fluid puncture", is one of the prenatal examination items. It obtains information about the health and development of the fetus by extracting amniotic fluid specimens from pregnant women. For example, chromosomal diseases can be detected through amniocentesis, the development of the fetal lungs can be understood, or intrauterine infections can be judged. During the puncture operation, under the guidance of ultrasound, a slender needle (i.e., the puncture needle) needs to pass through the pregnant woman's abdominal wall, the amniotic cavity wall and enter the amniotic cavity, and then an appropriate amount of amniotic fluid is aspirated through a syringe. Then, the amniotic fluid sample is sent to the laboratory for subsequent tests. Currently, our hospital uses manual aspiration during the puncture operation. However, there are dozens of pregnant women going for examinations every day, and the workload and labor intensity of manual aspiration are large. Long-term repetitive labor is likely to cause hand soreness or hand diseases.

[0003] In order to solve the above technical problems, the Chinese utility model patent with the publication number CN209107412U discloses an in-vitro fixing device for automatic aspiration of an amniocentesis needle. This device is used to fix the part of the puncture needle outside the body and can assist the syringe for automatic aspiration at the same time. However, there are still the following technical problems in actual use: the above fixing device is not convenient for quickly disassembling and assembling the syringe, and cannot be applied to syringes of different specifications, so the applicability is poor. Content of the Utility Model

[0004] The utility model provides an empty needle assisted aspiration device for amniocentesis, which can solve the technical problems that the existing fixing device is not convenient for quickly disassembling and assembling the syringe and cannot be applied to syringes of different specifications.

[0005] The present application provides the following technical solutions:

[0006] The empty needle assisted aspiration device for amniocentesis includes a support arm, a connecting seat and a pulling mechanism. The connecting seat is arranged at the free end of the support arm, and the pulling mechanism is vertically arranged at the bottom of the connecting seat; the pulling mechanism includes a fixed body and a moving body arranged oppositely. An installation cavity is arranged on the fixed body, and a suction component is arranged in the installation cavity. The suction component is connected to the piston rod of the syringe and is used for pulling up the piston rod; on the opposite side walls of the fixed body and the moving body, there are card slots for connecting with the ear plates on the upper part of the syringe barrel; the moving body is slidably arranged on the connecting seat, and an elastic member is also arranged on the connecting seat. The elastic member is connected to the moving body and is used for pushing the moving body towards the direction of the fixed body.

[0007] Beneficial Effects:

[0008] 1. By setting the pulling mechanism into two parts, one part is a solid body to ensure the stability of the pulling mechanism, and the other part is a moving body. During installation, according to syringes of different specifications and sizes, the moving body can be slid to adjust the distance between the two parts, making it applicable to various models of syringes, and the syringe is fixed through the two-part structure.

[0009] 2. An elastic member is provided on the connecting seat. When installation is required, the moving body is slid in a direction away from the fixed body, separating the two parts to form an installation distance. The ear plates at the left and right ends of the syringe are snapped into the card slots, and then the moving body is released. At this time, the elastic member is in a compressed state, applying a force to the moving body, causing the moving body to hold the syringe tightly, thereby realizing the fixation of the syringe; when removing, only need to push the moving body in a direction away from the fixed body to separate the two parts by a certain distance, and then take out the syringe. The operation is simple and fast, improving the disassembly and assembly efficiency.

[0010] 3. Using the elastic member to limit the displacement of the moving body can improve the fixation effect. After the syringe is snapped in, the elastic member can be used to limit the further displacement of the moving body, and can also apply a force to the moving body to move in the direction of the fixed body, improving the stability of the clamping connection.

[0011] 4. The fixed body and the moving body are used to fix the ear plate and the outer cylinder of the syringe, and the suction assembly is used to fix the piston rod of the syringe. Compared with the prior art that only fixes the piston rod and the puncture needle, the present application is more conducive to stably pulling the piston rod.

[0012] Further, the suction assembly includes a lead screw and a motor for driving the rotation of the lead screw. The motor is arranged at the top of the installation cavity. The lead screw includes a screw rod and a sleeve. The screw rod is vertically arranged in the installation cavity, and a clamping block is arranged on the sleeve. The clamping block is connected to the piston rod.

[0013] Beneficial effects: By connecting the clamping block to the piston rod, when the screw rod rotates, the sleeve makes a linear motion to drive the clamping block to move, thereby pulling the piston rod of the syringe and realizing the function of automatic suction, liberating manpower and reducing the work intensity and workload of medical staff.

[0014] Further, a groove is arranged on the clamping block, and an elastic layer is arranged on the groove wall of the groove. The groove is used for clamping connection with the piston rod.

[0015] Beneficial effects: The arrangement of the groove facilitates the quick clamping or removal of the piston rod. An elastic layer is arranged in the groove. After the piston rod is clamped, the elastic layer has a certain squeezing effect on the piston rod, which is beneficial to improving the connection stability.

[0016] Furthermore, a chute with a T-shaped cross-section is provided at the bottom of the connecting seat, and a T-shaped slider is provided at the top of the moving body. The slider is slidably arranged in the chute; the elastic member is a compression spring, and the compression spring is arranged on the side of the chute away from the fixed body.

[0017] Beneficial effects: The T-shaped chute and slider are beneficial for limiting the moving body, so that the moving body can only move horizontally.

[0018] Furthermore, the clamping groove is an arc-shaped groove. When the ear plate of the syringe is clamped with the arc-shaped groove, the lower side walls of the fixed body and the moving body are in contact with the outer wall of the syringe, and a rubber layer is provided on the contact surface.

[0019] Beneficial effects: The arc-shaped groove is similar in structure to the ear plate of the syringe, and the clamping effect is better; the rubber layer is provided to increase the friction force and improve the fixing stability on the one hand, and can play a buffering role on the other hand.

[0020] Furthermore, a rubber layer is also provided on the groove wall of the arc-shaped groove.

[0021] Beneficial effects: The rubber layer has a certain elasticity, which is beneficial to improving the connection stability between the ear plate and the arc-shaped groove. Description of the Drawings

[0022] Figure 1 is a schematic structural diagram of the auxiliary suction device of the present utility model;

[0023] Figure 2 is Figure 1 a perspective view of the fixed body and the moving body in

[0024] Figure 3 a sectional view of the auxiliary suction device;

[0025] Figure 4 is a schematic structural diagram of the clamping block;

[0026] Figure 5 is a right sectional view of the connecting seat. Detailed Description of the Embodiment

[0027] The following is a further detailed description through specific embodiments:

[0028] The marks in the attached drawings of the specification include: support arm 1, connecting seat 2, chute 21, compression spring 22, clamping groove 30, fixed body 31, installation cavity 311, moving body 32, slider 322, lead screw 41, sleeve 411, motor 42, clamping block 5, groove 51, syringe 200, piston rod 201, ear plate 202.

[0029] Embodiment 1

[0030] As Figure 1As shown, the empty needle-assisted suction device for amniocentesis includes a support arm 1, a connecting seat 2 and a pull-out mechanism, wherein the connecting seat 2 is arranged at the free end of the support arm 1, and the pull-out mechanism is vertically arranged at the bottom of the connecting seat 2; when in use, the support arm 1 can be fixed on the bed frame of the operating bed, or connected to stand beside the operating bed through a bracket. The pull-out mechanism includes a fixed body 31 and a movable body 32 arranged relatively, wherein the top of the fixed body 31 is fixedly connected to the bottom of the connecting seat 2, and the movable body 32 is slidably arranged at the bottom of the connecting seat 2; specifically, Figure 2 As shown, in this embodiment, the fixed body 31 and the movable body 32 are both semi-cylindrical structures, and when the two bodies are fitted together, a complete cylindrical structure is formed, or the movable body 32 and the fixed body 31 can also be set as a rectangular structure, and the former is preferred in this embodiment; but no matter which structure is adopted, the opposite side walls of the fixed body 31 and the movable body 32 are provided with a card slot 30 for connecting with the ear plate 202 on the upper part of the barrel of the syringe 200; more preferably, a concave cavity can also be set on the opposite side walls of the fixed body 31 and the movable body 32.

[0031] like Figure 3 As shown, in this embodiment, the concave cavity on the fixed body 31 is a mounting cavity 311, and a suction assembly is arranged in the mounting cavity 311, and the suction assembly is connected to the piston rod 201 of the syringe 200, and is used to pull the piston rod 201 upward; specifically, the suction assembly includes a lead screw and a motor 42 for driving the lead screw to rotate, and the motor 42 is arranged at the top of the mounting cavity 311. The lead screw includes a lead screw 41 and a sleeve 411, and the lead screw 41 is vertically arranged in the mounting cavity 311. The sleeve 411 is connected to a block 5, and the block 5 is connected to the piston rod 201 of the syringe 200; as shown in FIG. Figure 4 As shown, in this embodiment, in order to facilitate the quick removal or insertion of the piston rod 201, a groove 51 is provided on the clamping block 5, and an elastic layer (not shown in the figure) is provided on the groove wall of the groove 51. The groove 51 is used to engage with the piston rod 201. In this embodiment, the elastic layer can be made of rubber or silicone; Figure 1 As shown, when the piston rod 201 is inserted into the groove 51, the end plate on the top of the piston rod 201 is located on the upper surface of the block 5 and contacts the upper surface. When the block 5 moves upward, its upper surface pushes against the end plate of the piston rod 201 to move, thereby driving the piston rod 201 to move and realize suction.

[0032] like Figure 3 As shown, the connection base 2 is also provided with an elastic member, which is connected to the mobile body 32 and is used to push the mobile body 32 to move in the direction of the fixed body 31. Figure 5 As shown, a slide groove 21 with a T-shaped cross section is provided at the bottom of the connecting seat 2, and a T-shaped slider 322 is provided at the top of the moving body 32, and the slider 322 is slidably disposed in the slide groove 21; Figure 3As shown in the figure, in this embodiment, the elastic member is a compression spring 22. The compression spring 22 is arranged on the side of the chute 21 away from the fixed body 31. One end of the compression spring 22 is connected to the chute 21, and the other end is connected to the slider 322. When the compression spring 22 is in its natural state, the moving body 32 can be in contact with the fixed body 31, or there is a certain gap between them. After the syringe 200 is inserted, the compression spring 22 is in a compressed state, and the compression spring 22 is used to push the moving body 32 to hold the syringe 200 tightly.

[0033] In this embodiment, the clamping grooves 30 provided on the fixed body 31 and the moving body 32 are both arc-shaped grooves. When the ear plate 202 of the syringe 200 is clamped with the arc-shaped groove, the lower side walls of the fixed body 31 and the moving body 32 are in contact with the outer barrel wall of the syringe 200. And a rubber layer (not shown in the figure) is provided on the contact surface between the moving body 32 and the fixed body 31 to increase the friction force by using the rubber layer and play a certain buffering role at the same time. More preferably, the lower side walls of the moving body 32 and the fixed body 31 in contact with the outer barrel wall of the syringe 200 can also be set to be arc-shaped, an arc-shaped groove is opened on the arc-shaped side wall, and a rubber layer can also be provided on the groove wall of the arc-shaped groove; when installing, the ear plate 202 on the syringe 200 is inserted into the arc-shaped groove, and the gap formed between the upper parts of the fixed body 31 and the moving body 32 is beneficial to the smooth movement of the piston rod 201 and will not interfere with the piston rod 201.

[0034] When in use, first slide the moving body 32 to make a certain installation gap between the moving body 32 and the fixed body 31, then insert the syringe 200, so that the piston rod 201 of the syringe 200 is inserted into the groove 51 of the clamping block 5, and the ear plates 202 on both sides of the outer barrel wall of the syringe 200 are respectively inserted into the clamping grooves 30 of the fixed body 31 and the moving body 32, and then release the moving body 32. Under the elastic force of the compression spring 22, the moving body 32 and the fixed body 31 hold the syringe 200 tightly; then connect the end of the puncture needle outside the patient to the front end of the syringe 200. After the connection is completed, start the motor 42, the motor 42 drives the lead screw 41 to rotate, and the sleeve 411 moves upward on the lead screw 41, and then drives the piston rod 201 of the syringe 200 to move upward by using the clamping block 5 to realize the automatic aspiration function; after the aspiration is completed, only need to push the moving body 32 to slide again to make it away from the syringe 200, then the syringe 200 can be taken off from the fixed body 31. The disassembly and assembly method is simple, and the disassembly and assembly efficiency can be improved; in addition, it can be applied to syringes 200 of various specifications, with strong practicability, and by setting the compression spring 22, it can ensure that the separated fixed body 31 and moving body 32 hold the syringe 200 tightly, ensuring the stability of the connection.

[0035] The above are only the embodiments of the present utility model. The utility model is not limited to the fields involved in this embodiment case. Common knowledge such as the specific structures and characteristics known in the solutions is not described in detail herein. It should be noted that for those skilled in the art, without departing from the structure of the present utility model, several deformations and improvements can be made, which should also be regarded as the protection scope of the present utility model, and these will not affect the implementation effect of the present utility model and the practicality of the patent. The protection scope required by this application shall be subject to the content of its claims, and the specific implementation manners and the like recorded in the specification can be used to interpret the content of the claims.

Claims

1. An empty needle-assisted aspiration device for amniocentesis, characterized in that, It includes a support arm, a connecting seat and a drawing mechanism. The connecting seat is arranged at the free end of the support arm, and the drawing mechanism is vertically arranged at the bottom of the connecting seat. The drawing mechanism includes a fixed body and a moving body arranged oppositely. An installation cavity is arranged on the fixed body, and a suction assembly is arranged in the installation cavity. The suction assembly is connected to the piston rod of the syringe and is used for pulling the piston rod upward. On the opposite side walls of the fixed body and the moving body, there are card slots for connecting with the ear plates on the upper part of the syringe barrel. The moving body is slidably arranged on the connecting seat, and an elastic member is also arranged on the connecting seat. The elastic member is connected to the moving body and is used for pushing the moving body to move in the direction of the fixed body.

2. The amniocentesis empty syringe assisted aspiration device according to claim 1, wherein: The suction assembly includes a lead screw and a motor for driving the lead screw to rotate. The motor is arranged at the top of the installation cavity. The lead screw includes a screw rod and a sleeve. The screw rod is vertically arranged in the installation cavity, and a clamping block is arranged on the sleeve. The clamping block is connected to the piston rod.

3. The amniocentesis empty syringe-assisted aspiration device according to claim 2, wherein: The clamping block is provided with a groove, and an elastic layer is arranged on the groove wall of the groove. The groove is used for clamping with the piston rod.

4. The amniocentesis empty syringe assisted aspiration device according to any one of claims 1-3, characterized in that: The bottom of the connecting seat is provided with a chute with a T-shaped cross section, and the top of the moving body is provided with a T-shaped slider. The slider is slidably arranged in the chute. The elastic member is a compression spring, and the compression spring is arranged on the side of the chute away from the fixed body.

5. The amniocentesis empty needle assisted aspiration device according to claim 4, characterized in that: The card slot is an arc-shaped slot. When the ear plate of the syringe is clamped with the arc-shaped slot, the lower side walls of the fixed body and the moving body are in contact with the outer barrel wall of the syringe, and a rubber layer is arranged on the contact surface.

6. The amniocentesis empty syringe assisted aspiration device according to claim 5, characterized in that: A rubber layer is also arranged on the groove wall of the arc-shaped slot.

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