An obstetric amniotic fluid drainage device

Abstract

This invention relates to and discloses an amniotic fluid drainage device for obstetrics, comprising an outer cylinder and an inner cylinder that are hollow inside and open at both ends. The inner cylinder has a first end and a second end, with the first end slidably disposed within the inner cavity of the outer cylinder. A drainage needle is disposed within the inner cylinder and slidably disposed along the length of the inner cylinder, with the second end of the drainage needle protruding outside the inner cylinder. A positioning mechanism is provided on the inner cylinder. Through the cooperation of the positioning mechanism, the inner cylinder, the outer cylinder, and the drainage needle, the outer cylinder provides protection for the inner cylinder. Before amniotic fluid drainage, the positioning mechanism is used to attach the first end of the inner cylinder to the pregnant woman's abdomen or fetal membranes, preventing the inner cylinder from slipping relative to the smooth skin or fetal membranes. This ensures that the inner cylinder is always in the predetermined puncture position, thereby reducing the difficulty of the drainage operation. Furthermore, when using the drainage needle to puncture the skin and / or fetal membranes, the fixation of the inner cylinder ensures that the drainage needle does not slip, thereby reducing the difficulty of puncture and avoiding secondary injury to the pregnant woman.

Description

Technical Field

[0001] This invention relates to the field of drainage device technology, and in particular to an obstetric amniotic fluid drainage device. Background Technology

[0002] Amniocentesis is a common obstetric procedure used to treat and induce labor, especially in the treatment of polyhydramnios (excess amniotic fluid) in late pregnancy. Polyhydramnios can lead to premature birth, placental abruption, and fetal malformations. Therefore, timely amniocentesis is crucial for pregnant women with polyhydramnios. Amniocentesis includes two methods: transabdominal puncture and transvaginal rupture of membranes. Transabdominal puncture involves directly inserting a drainage device through the skin of the abdomen to remove amniotic fluid. Transvaginal puncture involves inserting a drainage device into the vagina and using a needle to puncture the amniotic sac to drain the amniotic fluid. However, when using existing amniotic fluid drainage devices, the puncture needle in the device is manually operated by medical staff. To prevent the needle from deviating from the selected puncture site, the medical staff need to be highly focused and control the force in their hands to ensure that the puncture needle does not deviate. However, during puncture, the pregnant woman's abdominal skin is smooth, especially when the amniotic sac is smooth due to the fluid on the surface during vaginal puncture. The operating space during vaginal amniotic fluid drainage is limited, and because the amniotic sac has a certain thickness and elasticity, it is difficult for medical staff to accurately control the puncture angle and direction of the drainage needle by hand without other support. Therefore, the drainage needle is prone to slipping during puncture, causing the puncture site to deviate, thus increasing the difficulty of puncture. Even a slight mistake may cause harm to the pregnant woman and the fetus. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the technical problem to be solved by the present invention is to provide an obstetric amniotic fluid drainage device to solve the problems of slippage of the puncture needle and deviation of the position from the puncture point during amniotic fluid drainage.

[0004] To solve the above-mentioned technical problems, the present invention provides an obstetric amniotic fluid drainage device, specifically comprising an outer cylinder and an inner cylinder that are hollow inside and open at both ends. The inner cylinder has a first end and a second end, with the first end slidably disposed within the inner cavity of the outer cylinder. During transvaginal amniotic fluid drainage, the outer cylinder facilitates entry into the pregnant woman's vagina and provides protection for the inner cylinder. A drainage needle with a first end and a second end is disposed within the inner cylinder and slidably disposed along the length of the inner cylinder. The second end of the drainage needle extends out of the inner cylinder. When the inner cylinder contacts the surface of the object to be punctured, the second end of the drainage needle is pushed to move the drainage needle toward the first end for puncture. A positioning mechanism is provided on the inner cylinder. This positioning mechanism is used to restrict the first end of the inner cylinder to the puncture site on the surface of the object to be punctured before puncture, providing a support point for the inner cylinder while preventing slippage. During the use of the drainage needle, it ensures that the drainage needle can be held in the predetermined position for puncture, ensuring that it does not deviate from the puncture point during the puncture process, thereby reducing the operational difficulty for medical personnel and improving safety.

[0005] The positioning mechanism includes an adsorption part disposed on the first end of the inner cylinder, a pushing part disposed on the second end of the inner cylinder, and a connecting part disposed on the inner cylinder and connecting the adsorption part and the pushing part. The pushing part operates and controls the adsorption part to adsorb onto the surface of the object to be punctured through the connecting part, so as to restrict the movement of the inner cylinder.

[0006] The inner cylinder has a receiving cavity extending through both ends of the inner cylinder along its length. The drainage needle is slidably disposed in the receiving cavity so that the inner cylinder can protect the tip of the drainage needle. At the same time, the inner cylinder can prevent the tip of the drainage needle from scratching the skin or vaginal wall. The adsorption part includes an air bladder that is arranged around the outer wall of the inner cylinder at the first end of the inner cylinder. The inner cavity of the air bladder is connected to the connecting part. When the air bladder expands under the action of the pushing part through the connecting part, the air bladder unfolds at the first end of the inner cylinder so that the air bladder faces away from the outer wall of the inner cylinder and adheres to the surface of the punctured object. The expanded air bladder increases the contact area between itself and the punctured surface, which reduces the possibility of slippage of the inner cylinder to a certain extent and provides support for the inner cylinder, making the inner cylinder more stable.

[0007] The connecting part includes a first conveying channel formed on the inner cylinder and respectively connecting the air bladder and the pushing part. After the pushing part is in operation, it conveys or outputs gas toward the air bladder. After the air bladder contracts, it facilitates the inner cylinder to enter small-diameter objects, such as passing through the cervix. After the air bladder expands, it provides support to the inner cylinder and plays an anti-slip role.

[0008] The connecting part also includes a second conveying channel formed on the inner cylinder. The first end of the second conveying channel extends and penetrates to the first end of the inner cylinder. The first end of the second conveying channel is located outside the airbag. The second end of the second conveying channel is connected to the pushing part. The drainage needle is sealed and slidably disposed in the receiving cavity. When the pushing part runs and the first end of the inner cylinder abuts against the surface of the punctured object, the pushing part continues to run and can draw air between the surface of the punctured object and the airbag through the second conveying channel, so that the airbag is tightly adsorbed on the surface of the punctured object, thereby further improving the limiting and positioning effect of the inner cylinder, and thus more effectively preventing the inner cylinder and the drainage needle from slipping and causing unnecessary trouble.

[0009] The pushing unit includes an air cylinder fixed to the second end of the inner cylinder, a cavity formed inside the air cylinder and sealed around the outer wall of the inner cylinder, and a pushing member arranged along the length of the inner cylinder and slidably sealed to the inner wall of the cavity. The first end of the air cylinder is close to the airbag. The pushing member divides the cavity into a first air chamber near the first end of the air cylinder and a second air chamber near the second end of the air cylinder. The first air chamber is used to connect to the first delivery channel, and the second air chamber is used to connect to the second delivery channel. When the pushing member slides in the cavity, the gas in the first air chamber causes the airbag to expand or contract through the first delivery channel, and the gas in the second air chamber draws air between the surface of the punctured object and the airbag through the second delivery channel. In this way, the gas supply and extraction of the first and second delivery channels can be achieved simply by pushing the pushing member. The structure and operation are simple and convenient.

[0010] The air-pushing component includes a piston that is slidably and sealed within the cavity, and a push rod whose first end is fixedly connected to the piston and whose second end extends beyond the second end of the air cylinder along the length of the inner cylinder. The push rod is slidably and sealed to the second end of the air cylinder. The second end of the drainage needle is movably inserted through the inner side of the push rod so that the use of the push rod and the piston does not affect the use of the drainage needle. The second ends of the first delivery channel and the second end of the second delivery channel are both connected to the cavity. The distance between the second end of the first delivery channel and the inner wall of the first end of the air cylinder is less than the length of the piston parallel to the length of the inner cylinder and greater than half of the length of the piston parallel to the length of the inner cylinder. The second end of the second delivery channel is close to the second end of the air cylinder. The piston is positioned so that when it moves toward the airbag and blocks the first delivery channel, the first air chamber still has some space for the piston to continue moving toward the airbag. Thus, the airbag is already inflated and will no longer deliver gas into the airbag as the piston continues to move. At the same time, the first air chamber decreases while the volume of the second air chamber continues to increase, resulting in negative pressure in the second air chamber and the second delivery channel. This draws air from between the airbag and the surface of the punctured object into the second air chamber, causing the airbag to adhere to the surface of the punctured object and achieve the purpose of limiting the inner cylinder. The overall structure of the pusher is ingeniously designed, and two functions can be achieved simply by pushing the push rod. This multi-functional design enhances the safety of the entire drainage device.

[0011] The thruster also includes a compression chamber recessed on the side of the piston near the air bladder, a sealing plug movably disposed within the compression chamber to seal the opening of the compression chamber, and a spring disposed within the compression chamber along the length of the inner cylinder. The two ends of the spring are respectively connected to the sealing plug and the inner wall of the compression chamber. Without external force, the spring extends to compress the sealing plug, causing the sealing plug to block the opening of the compression chamber. A third conveying channel with its first end connected to the compression chamber is formed on the piston. The second end of the third conveying channel extends and passes through the second end of the push rod. When the piston slides toward the air bladder, the gas in the first air chamber is pushed toward the first conveying channel to inflate the air bladder. When the piston blocks the first conveying channel and continues to slide, the gas in the first air chamber is compressed. The compressed gas in the first air chamber pushes the sealing plug toward the compression chamber until the sealing plug can no longer block the opening of the compression chamber, so that the gas in the first air chamber enters the compression chamber and is output through the third conveying channel to ensure that the piston can continue to move toward the air bladder after the first conveying channel is blocked, thereby causing the volume in the second air chamber to continue to increase and form a negative pressure.

[0012] The amniotic fluid drainage device for obstetric use of the present invention has at least the following beneficial effects:

[0013] Through the cooperation of the positioning mechanism, inner tube, outer tube, and drainage needle, the outer tube provides protection for the inner tube and drainage needle. Before amniotic fluid drainage, the positioning mechanism is used to attach the first end of the inner tube to the pregnant woman's abdomen or fetal membranes, preventing the inner tube from slipping relative to the smooth skin or fetal membranes. This ensures that the inner tube is always in the predetermined puncture position, reducing the difficulty of the drainage operation. Furthermore, when using the drainage needle to puncture the skin and / or fetal membranes, the fixation of the inner tube ensures that the drainage needle does not slip, thereby reducing the difficulty of puncture and avoiding secondary injury to the pregnant woman. Attached Figure Description

[0014] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0015] Figure 1 This is a front sectional view of Embodiment 1 of the present invention;

[0016] Figure 2 This is an enlarged cross-sectional view of Embodiment 1 of the present invention;

[0017] Figure 3 This is an enlarged cross-sectional view of the airbag after inflation according to Embodiment 1 of the present invention;

[0018] Figure 4 for Figure 3 An enlarged view of part A shown;

[0019] Figure 5 for Figure 3 An enlarged view of part B shown;

[0020] Figure 6 This is a front sectional view of Embodiment 2 of the present invention;

[0021] Figure 7 This is an enlarged cross-sectional view of Embodiment 2 of the present invention.

[0022] The meanings of the labels in the attached diagram are as follows:

[0023] Outer cylinder-1; First sliding sleeve-11; Inner cylinder-2; First end-21; Second end-22; Receiving cavity-23; Second sliding sleeve-24; Drainage needle-3; Limiting block-31; Needle tip section-32; Drainage tube-33; Bending sleeve-34; Positioning mechanism-4; Adsorption part-41; Airbag-411; Pushing part-42; Air cylinder-421; Cavity-422; First air chamber-4221; Second air chamber-4222; Pushing component-423; Piston-4231; Push rod-4232; Compression chamber-4233; Sealing plug-4234; Spring-4235; Third conveying channel-4236; Connecting part-43; First conveying channel-431; Second conveying channel-432. Detailed Implementation

[0024] The invention will now be further described with reference to the accompanying drawings.

[0025] Reference Figures 1 to 7 As shown, the obstetric amniotic fluid drainage device of the present invention includes an outer cylinder 1 with a hollow interior and open ends, an inner cylinder 2 with a hollow interior and open ends, a drainage needle 3 having a first end 21 and a second end 22 and slidably disposed within the inner cylinder 2 along its length, and a positioning mechanism 4 disposed on the inner cylinder 2. The inner cylinder 2 also has a first end 21 and a second end 22, and the first end 21 of the inner cylinder 2 is slidably disposed within the inner cavity of the outer cylinder 1, while the second end 22 of the inner cylinder 2 extends to the outside of the outer cylinder 1. The second end of the drainage needle 3 protrudes outside the inner cylinder 2 so as to pass through the second end 22 of the inner cylinder 2 outside the outer cylinder 1. The second end of the drainage needle 3 controls the movement of the inner cylinder 2 and the drainage needle 3. The inner cylinder 2 protects the drainage needle 3 and, during vaginal amniotic fluid drainage, allows it to pass through the cervix and enter the uterus. During insertion, the inner cylinder 2 covers the tip of the drainage needle 3 to prevent it from piercing the cervix and causing secondary injury to the pregnant woman. The positioning mechanism 4 restricts the first end 21 of the inner cylinder 2 to a selected puncture site on the surface of the object to be punctured before puncture. The object to be punctured refers to the abdomen in abdominal amniotic fluid drainage or the fetal membranes in vaginal amniotic fluid drainage. It should be noted that in this invention, each part of the inner cylinder 2, outer cylinder 1, drainage needle 3, and positioning mechanism 4 has a first end and a second end. The first end refers to the first end of each component, such as... Figure 1 The first end is shown on the left, and the second end refers to the end where each component is located on the right.

[0026] The outer cylinder 1 has a cylindrical structure, and its first end is spherically treated to ensure a smooth surface. During transvaginal amniotic fluid drainage, the smooth first end of the outer cylinder 1 penetrates the pregnant woman's vagina more easily and without damaging the vaginal walls. A cylindrical cavity extends through the interior of the outer cylinder 1 along its length. A first annular sliding sleeve 11, coaxial with the cavity, is fixedly installed within this cavity. At least one first sliding sleeve 11 is used, and its inner diameter is equal to the outer diameter of the inner cylinder 2. The first sliding sleeve 11 can be made of a rigid material. After the inner cylinder 2 is inserted into the first sliding sleeve 11, it can slide relative to the first sliding sleeve 11 along the length of the outer cylinder 1, ensuring structural stability of the inner cylinder 2 relative to the outer cylinder 1. The inner cylinder 2, extending into the outer cylinder 1 and reaching its smooth end, forms the first end 21 of both the inner cylinder 2 and the drainage needle 3.

[0027] Example 1

[0028] Reference Figures 1 to 5As shown, both the inner cylinder 2 and the drainage needle 3 are cylindrical structures. The inner cylinder 2 has a cylindrical receiving cavity 23 extending along its length from both ends, and the receiving cavity 23 is coaxially arranged with the inner cylinder 2. A second annular sliding sleeve 24 is provided within the receiving cavity 23. At least one second sliding sleeve 24 is provided, and its inner diameter is equal to the outer diameter of the drainage needle 3, allowing the drainage needle 3 to pass precisely through the inner ring of the second sliding sleeve 24. Preferably, the second sliding sleeve 24 is made of hard rubber, while the drainage needle 3 is made of metal with a smooth outer wall. After passing through the second sliding sleeve 24, the drainage needle 3 can slide relative to the second sliding sleeve 24 and thus relative to the receiving cavity 23. A sealed environment is formed between the second sliding sleeve 24 and the drainage needle 3, preventing air from passing between the drainage needle 3 and the inner ring wall. Correspondingly, the outer wall of the second sliding sleeve 24 is fixedly connected to the inner wall of the receiving cavity 23 at the corresponding position, so that after the drainage needle 3 passes through the second sliding sleeve 24, the second sliding sleeve 24 and the drainage needle 3 can block the receiving cavity 23. The drainage needle 3 is a long rod-shaped medical puncture needle, the first end of the drainage needle 3 is the needle tip, and the second end of the drainage needle 3 is provided with a connection interface for connecting with other drainage tubes 33. Preferably, a limiting block 31 made of rubber or silicone is fitted onto the drainage needle 3. The limiting block 31 is only fitted onto the first end 21 of the drainage needle 3, and the length of the limiting block 31 is less than the diameter of the receiving cavity 23 so that the limiting block 31 can enter the receiving cavity 23 with the drainage needle 3. The limiting block 31 can move on the drainage needle 3 under the action of external force. Due to the characteristics of its own material, after the limiting block 31 is fitted onto the drainage needle 3, it stays on the drainage needle 3 by the friction between it and the drainage needle 3. Before using the drainage needle 3 to puncture the fetal membrane, the thickness of the punctured object can be measured by means of B-ultrasound or other means. Then, the distance between the tip of the drainage needle 3 and the limiting block 31 can be adjusted by adjusting the position of the limiting block 31, thereby avoiding the possibility of the drainage needle 3 excessively puncturing into the fetal membrane and injuring the fetus.

[0029] The positioning mechanism 4 includes an adsorption part 41 disposed on the first end 21 of the inner cylinder 2, a pushing part 42 disposed on the second end 22 of the inner cylinder 2, and a connecting part 43 disposed on the inner cylinder 2 and connecting the adsorption part 41 and the pushing part 42. When the inner cylinder 2 is pushed to contact the surface of the object to be punctured, the pushing part 42 is driven to run. The pushing part 42 controls the adsorption part 41 to support and contact the surface of the object to be punctured through the connecting part 43, thereby increasing the contact area of ​​the inner cylinder 2 and reducing the possibility of slippage of the inner cylinder 2. In addition, the pushing part 42 can also make the adsorption part 41 adsorb onto the surface of the object to be punctured through the connecting part 43, so that the first end 21 of the inner cylinder 2 cannot easily detach from the surface of the object to be punctured, thereby preventing the inner cylinder 2 from slipping and increasing the difficulty and time of operation. At the same time, after being limited inside the inner cylinder 2, when the drainage needle 3 is pushed to puncture, the first end 21 of the drainage needle 3 will not deviate from the puncture site, thereby increasing the safety of puncture and reducing the difficulty and time of puncture.

[0030] The adsorption unit 41 includes an airbag 411, which is circumferentially disposed around the outer wall of the inner cylinder 2 at the end of the first end 21 of the inner cylinder 2. The inner cavity of the airbag 411 is connected to the connecting part 43. The airbag 411 can be made of medical rubber, nylon, or other materials, and has the characteristics of high tensile strength. The airbag 411 is sealed to the inner cylinder 2. When the airbag 411 expands under the action of the pushing part 42 through the connecting part 43, the airbag 411 unfolds at the first end 21 of the inner cylinder 2, so that the airbag 411 facing away from the outer wall of the inner cylinder 2 fits against the surface of the object to be punctured, so that the side of the airbag 411 facing away from the second end 22 of the inner cylinder 2 unfolds flat, while the side of the airbag 411 facing the second end 22 of the inner cylinder 2 has an arc surface that protrudes towards the second end 22 of the inner cylinder 2. When the first end 21 of the inner cylinder 2 abuts against the surface of the object to be punctured and the airbag 411 is inflated, the side of the airbag 411 facing away from the second end 22 of the inner cylinder 2 unfolds relative to the end portion of the first end 21 of the inner cylinder 2 and adheres to the surface of the object to be punctured, thereby increasing the contact area between the airbag 411 and the surface of the object to be punctured. Since the friction between the surface of the airbag 411 and the skin is relatively large after the airbag 411 comes into contact with the skin of the pregnant woman's abdomen due to the characteristics of the material of the airbag 411 itself, the airbag 411 attached to the skin reduces the possibility of the inner cylinder 2 slipping, which not only saves puncture time, but also reduces the difficulty of operation, reduces the workload of medical staff, provides safety guarantee for amniotic fluid drainage treatment, and the airbag 411 has low usage cost.

[0031] Reference Figures 1 to 4As shown, the connecting part 43 includes a first conveying channel 431 formed on the inner cylinder 2 and connecting the airbag 411 and the pushing part 42 respectively, and a second conveying channel 432 formed on the inner cylinder 2. The first end of the second conveying channel 432 extends and penetrates to the end of the first end 21 of the inner cylinder 2. The first end of the second conveying channel 432 extending to the end of the first end 21 of the inner cylinder 2 is located outside the airbag 411 and is not connected. That is, the airbag 411 is located outside the second conveying channel 432 and is not connected to the second conveying channel 432. The airbag 411 is arranged around the second conveying channel 432 so that the airbag 411 and the second conveying channel 432 are independently set. The second end of the second conveying channel 432 is connected to the pushing part 42. When the pushing part 42 is running, the pushing part 42 delivers gas into the airbag 411 through the first conveying channel 431 to expand the wall or extracts gas from the airbag 411 to contract the airbag 411. When the balloon 411 contracts, because the material of the balloon 411 is relatively soft, when vaginal amniotic fluid drainage is required, the contracted balloon 411 will not prevent the inner tube 2 from penetrating the cervix. When the inner cylinder 2 is pressed against the surface of the punctured object and the pushing part 42 is running, the drainage needle 3 blocks the receiving cavity 23 due to the cooperation between the drainage needle 3 and the second sliding sleeve 24. At this time, the pushing part 42 draws out the gas between the inflated airbag 411 and the surface of the punctured object or delivers gas between the airbag 411 and the surface of the punctured object through the second delivery channel 432. When the pushing part 42 draws out the gas between the airbag 411 and the surface of the punctured object through the second delivery channel 432, the airbag 411 gradually adheres to the surface of the punctured object until it is tightly adhered. Especially for vaginal amniotic fluid drainage, since the surface of the fetal membrane is smoother than the skin, it is difficult to keep the inner cylinder 2 from slipping by the friction of the airbag 411 alone. However, after the second delivery channel 432 in this embodiment is used, it can be ensured that the airbag 411 is tightly adhered to the fetal membrane under the action of negative pressure. The fetal membrane at the puncture site can also be kept as dry as possible before use by using the water-absorbing part. When the pushing unit 42 delivers gas between the airbag 411 and the surface of the object to be punctured through the second conveying channel 432, the airbag 411, which is tightly attached to the surface of the object to be punctured, easily detaches from the surface of the object to be punctured, thereby reducing the difficulty of disassembly while ensuring the safe separation between the airbag 411 and the surface of the object to be punctured. Compared with using external force to tear the airbag 411 off the surface of the object to be punctured and causing damage to the surface of the object to be punctured, the operation method of this embodiment is safer and more reliable.

[0032] The pushing unit 42 includes an air cylinder 421 fixed on the second end 22 of the inner cylinder 2, a cavity 422 formed inside the air cylinder 421 and sealed around the outer wall of the inner cylinder 2, and a pushing member 423 arranged along the length of the inner cylinder 2 and slidably connected to the inner wall of the cavity 422. The first end of the air cylinder 421 is close to the air bag 411. The cavity 422 is connected to the first delivery channel 431 and the second delivery channel 432. By pushing the pushing member 423, the pushing member 423 slides in the cavity 422 inside the air cylinder 421 to deliver or extract gas into the first delivery channel 431 and the second delivery channel 432, thereby enabling the adsorption unit 41 to achieve the corresponding purpose.

[0033] The air cylinder 421 is cylindrical in shape. The first end of the air cylinder 421 can be connected to the second end 22 of the inner cylinder 2, or the air cylinder 421 can be sleeved on the second end 22 of the inner cylinder 2. The air cylinder 421 and the inner cylinder 2 are fixedly connected and coaxially arranged. In this embodiment, the air cylinder 421 is fixedly sleeved on the second end 22 of the inner cylinder 2, and the second end of the air cylinder 421 is flush with the end face of the second end 22 of the inner cylinder 2. This allows the receiving cavity 23 on the inner cylinder 2 to extend towards the inside of the air cylinder 421 to penetrate it. The second end 22 of the drainage needle 3 extends towards the side away from the airbag 411 to the outside of the receiving cavity 23 inside the inner cylinder 2 and the air cylinder 421.

[0034] The cavity 422 is formed by a recess extending outward along the radial direction of the inner wall of the cylinder 421 where it contacts the inner cylinder 2. The cavity 422 is also formed by a circumferential recess around the cylinder 421, resulting in a cylindrical shape. The cylinder 421 and the inner cylinder 2 are sealed together to keep the cavity 422 sealed. The second ends of both the first conveying channel 431 and the second conveying channel 432 extend to the side of the cavity 422 facing the inner cylinder 2 and penetrate into the cavity 422 to communicate with it. It should be noted that the cavity 422 can also be formed by a recess on the inner wall of the cylinder 421 where it contacts the inner cylinder 2, resulting in a prismatic shape. Furthermore, at least two cavities 422 can be formed and equidistantly distributed along the circumferential direction of the inner cylinder 2.

[0035] The air-pushing component 423 is sealed within the cavity 422, dividing the cavity 422 into a first air chamber 4221 for connecting the first delivery channel 431 and a second air chamber 4222 for connecting the second delivery channel 432. The first air chamber 4221 is located near the first end of the air cylinder 421, and the second air chamber 4222 is located near the second end of the air cylinder 421. When the air-pushing component 423 is pushed to slide within the cavity 422, the gas in the first air chamber 4221 causes the airbag 411 to expand or contract through the first delivery channel 431, and the gas in the second air chamber 4222 draws or delivers air between the surface of the punctured object and the airbag 411 through the second delivery channel 432, thereby achieving the purpose of confining or detaching the inner cylinder 2 from the surface of the punctured object.

[0036] The air-pushing component 423 includes a piston 4231 that is slidably connected to the cavity 422, a push rod 4232 whose first end is fixedly connected to the piston 4231 and whose second end extends out of the second end of the air cylinder 421 along the length of the inner cylinder 2, a compression chamber 4233 recessed on the side of the piston 4231 near the airbag 411, a sealing plug 4234 movably disposed in the compression chamber 4233 and used to seal the opening of the compression chamber 4233, and a spring 4235 disposed in the compression chamber 4233 along the length of the inner cylinder 2. The piston 4231 is used to divide the cavity 422 into a first air chamber 4221 and a second air chamber 4222. The push rod 4232 is easy for medical personnel to push to drive the piston 4231 to slide in the cavity 422. The push rod 4232 is sealed and cooperates with the air cylinder 421, thereby realizing the delivery and intake of air to the first delivery channel 431 and the second delivery channel 432. During the movement of piston 4231, as the first air chamber 4221 is compressed and its volume decreases, the second air chamber 4222's volume increases; conversely, as the first air chamber 4221's volume increases, the second air chamber 4222 is compressed and its volume decreases. Thus, during the inflation of airbag 411, the second air chamber 4222 draws gas from between the surface of the punctured object and airbag 411 through the second delivery channel 432, causing airbag 411 to adhere to the surface of the punctured object. During the deflation of airbag 411, the second air chamber 4222 delivers gas between the surface of the punctured object and airbag 411 through the second delivery channel 432, causing airbag 411 to separate from the surface of the punctured object. During the compression process of the first air chamber 4221, when the airbag 411 is filled and no more gas can enter, the sealing plug 4234, the compression chamber 4233 and the spring 4235 cooperate with each other to ensure that the gas can be output through the third delivery channel 4236 and that the piston 4231 can continue to move. Thus, after the airbag 411 expands, it continues to draw air between the airbag 411 and the surface of the punctured object, so that the expanded airbag 411 can adhere to the surface of the punctured object.

[0037] The piston 4231 has a ring-shaped cylindrical structure corresponding to the cavity 422, and the inner and outer diameters of the piston 4231 are consistent with the inner and outer diameters of the cavity 422 so that the piston 4231 can slide within the cavity 422 while sealing with the cavity 422. Thus, a first air cavity 4221 and a second air cavity 4222 are formed within the cavity 422 and are not interconnected and are respectively sealed. The push rod 4232 can be a ring-shaped cylindrical structure or can be configured as at least two rod-shaped structures. When the push rod 4232 is a rod-shaped structure, each push rod 4232 is equidistantly distributed around the circumference of the inner cylinder 2. There is a gap between the inner wall of the push rod 4232 and the inner walls of the cavity 422. After the first end of the push rod 4232 is fixedly connected to the piston 4231, a through hole is opened on the second end face of the air cylinder 421 for the push rod 4232 to pass through. The second end of the push rod 4232 moves out of the through hole and is sealed with the through hole, so that the push rod 4232 can slide relative to the through hole while ensuring the sealing of the cavity 422. Specifically, a sealing ring or rubber ring can be set at the through hole to ensure the sealing between the through hole and the push rod 4232. Preferably, a pressing ring is fixedly connected to the second end of the push rod 4232 that moves out of the through hole. The pressing ring is circular and coaxial with the air cylinder 421. The inner diameter of the pressing ring is larger than the diameter of the receiving cavity 23. The second end 22 of the drainage needle 3 moves through the inner ring side of the pressing ring so that the drainage needle 3 can freely shuttle inside the push rod 4232.

[0038] Preferably, the portion between the piston 4231 and the cavity 422 near the airbag 411 is the first air chamber 4221 (e.g., ...). Figure 2 , Figure 3 The portion on the left side of piston 4231 shown, the portion between piston 4231 and the side of cavity 422 away from airbag 411 (as shown) Figure 2 , Figure 3 The portion to the right of the piston 4231 shown is the second air chamber 4222, and the second end of the first delivery channel 431 (as shown) Figure 2 The first conveying channel 431 shown is located at one end on the right side, and the inner wall of the first end of the air cylinder 421 (as shown) Figure 2The distance between the cavity 422 (located on the left inner wall) is less than the length of the piston 4231 parallel to the length of the inner cylinder 2. The distance between the second end of the first delivery channel 431 and the inner wall of the first end of the air cylinder 421 is greater than half the length of the piston 4231 parallel to the length of the inner cylinder 2. This is so that when the piston 4231 moves toward the air bladder 411 to compress the first air cavity 4221, the air bladder 411 expands. When the piston 4231 moves to the second end of the first delivery channel 431, the air bladder 411 is fully expanded. The piston 4231 blocks the first delivery channel 431, thus preventing further inflation into the air bladder 411. Even if the piston 4231 abuts against the inner wall of the first end of the air cylinder 421, the piston 4231 can still continue to block the first delivery channel 431 to ensure that the air bladder 411 does not leak air. The second end of the second delivery channel 432 is close to the inner wall of the second end of the air cylinder 421, so that when the piston 4231 moves toward the airbag 411, the second air chamber 4222 can promptly draw in the gas between the airbag 411 and the surface of the object being punctured through the second delivery channel 432. Thus, even if the piston 4231 moves toward the airbag 411 after blocking the first delivery channel 431, it will not affect the airbag 411. Simultaneously, it allows the volume of the second air chamber 4222 to continue to increase, generating negative pressure. This ensures that the second air chamber 4222 can continue to draw in the air between the airbag 411 and the surface of the object being punctured after the airbag 411 has fully expanded, thereby ensuring that the airbag 411 can adhere to the surface of the object being punctured. It should be noted that even if the piston 4231 continues to move after the airbag 411 is fully inflated and can no longer take in air, and the second end of the first delivery channel 431 is not blocked by the piston 4231, the first air chamber 4221 is compressed and the gas can no longer enter the saturated first delivery channel 431 and airbag 411. At this time, the first air chamber 4221 is under high pressure and squeezes and blocks the sealing plug 4234 at the opening of the compression chamber 4233 until the sealing plug 4234 can no longer block the opening of the compression chamber 4233. Then the gas in the first air chamber 4221 will be depressurized through the compression chamber 4233 to ensure that the piston 4231 can continue to move toward the airbag 411. Since the piston 4231 is still moving, the high-pressure airflow keeps the gas in the first delivery channel 431 saturated.

[0039] Reference Figure 5As shown, the compression chamber 4233 is cylindrical, and its axial direction is parallel to the length direction of the inner cylinder 2. A convex ring is provided around the opening of the compression chamber 4233, and the convex ring is integrally formed with the piston 4231. The two ends of the spring 4235 are respectively connected to the sealing plug 4234 and the inner wall of the compression chamber 4233 away from the opening, so that the sealing plug 4234 can move relative to the compression chamber 4233 along the axial direction of the compression chamber 4233 under the action of the spring 4235. On the side of the sealing plug 4234 facing the opening of the compression chamber 4233, a bowl-shaped convex surface is formed facing the opening, and the maximum diameter of the convex surface is larger than the inner diameter of the convex ring. The sealing plug 4234 can be made of materials such as rubber or silicone. The spring 4235 squeezes the sealing plug 4234 toward the opening side without external force, so that the sealing plug 4234 presses against the convex ring, so that the sealing plug 4234 blocks the inner side of the convex ring, and the gas in the first air chamber 4221 cannot enter the compression chamber 4233 before the air bag 411 is saturated. The sealing plug 4234 may not be connected to the inner wall of the compression chamber 4233. The sealing plug 4234 only needs to have a maximum diameter greater than the inner diameter of the convex ring to achieve a movable fit between the sealing plug 4234 and the compression chamber 4233. In this case, the first end of the third conveying channel 4236 can be connected to any part of the compression chamber 4233. Alternatively, a sliding groove can be opened on the sealing plug 4234, and a slide rail can be set along its axial direction on the inner wall of the compression chamber 4233 so that the sealing plug 4234 can be slidably set on the slide rail through the sliding groove to slide fit with the compression chamber 4233. In this case, the first end of the third conveying channel 4236 is located at the intersection of the compression chamber 4233 and the convex ring, so that after the sealing plug 4234 opens the opening of the compression chamber 4233, the first air chamber 4221 can be connected to the third conveying channel 4236 through the compression chamber 4233. Preferably, a third delivery channel 4236 is formed on the piston 4231, with its first end connected to the compression chamber 4233. The second end of the third delivery channel 4236 extends and passes through the second end of the push rod 4232. When the piston 4231 slides toward the air bladder 411, the gas in the first air chamber 4221 is pushed toward the first delivery channel 431 to inflate the air bladder 411. When the air bladder 411 is filled or the piston 4231 blocks the first delivery channel 431 and continues to slide, the gas in the first air chamber 4221 is compressed and pushes the sealing plug 4234 toward the compression chamber 4233 so that the gas in the first air chamber 4221 is output to the outside of the push rod 4232 through the third delivery channel 4236, thereby ensuring that the piston 4231 can continue to slide in the cavity 422. While the volume of the first air chamber 4221 decreases, the volume of the second air chamber 4222 increases, forming a negative pressure.

[0040] Example 2

[0041] Reference Figure 6 and Figure 7As shown, the first ends of the inner tube 2 and the drainage needle 3 are inclined relative to the middle and second ends of the inner tube 2 and the drainage needle 3, so that when performing transvaginal amniotic fluid drainage, since the passage in the cervix is ​​inclined relative to the vagina, the corresponding first ends are inclined so that the inner tube 2 and the drainage needle 3 can more easily enter the uterus through the cervix. The first end 21 of the inner cylinder 2 and the corresponding storage cavity 23, first delivery channel 431 and second delivery channel 432 are all inclined relative to the middle of the inner cylinder 2. The drainage needle 3 includes a needle tip 32 slidably disposed in the storage cavity 23 of the first end 21 of the inner cylinder 2, a soft tube fixedly connected to the needle tip 32 at its first end, a drainage tube 33 fixedly connected to the second end of the soft tube in the storage cavity 23 of the middle of the inner cylinder 2 and the second end 22 of the inner cylinder 2, and a bending sleeve 34 made of a rigid and bendable material wrapped around the soft tube. When medical staff push the second end of the drainage needle 3, the soft tube and the bending sleeve 34 can be bent so that the needle tip 32 can pass out of the inner cylinder 2. The bending sleeve 34 can prevent the soft tube from being squeezed and folded during the process of pushing the drainage needle 3, so that the needle tip 32 cannot pass out of the inner cylinder 2, and ensure that the drainage needle 3 can slide relative to the inner cylinder 2 in the bent state. The needle tip 32 is the first end of the drainage needle 3. Both the needle tip 32 and the drainage tube 33 are made of corrosion-resistant metal to ensure sufficient strength. Specifically, the needle tip 32 is located in the receiving cavity 23 of the inclined portion of the inner cylinder 2 and is slidably disposed in the inner cylinder 2 via a third sliding sleeve. The third sliding sleeve is designed with reference to the first sliding sleeve 11 or the second sliding sleeve 24, which will not be described in detail here. The bending sleeve 34 can be designed with reference to the structure of a metal bellows, as it can be bent and ensures that the inner tube will not be excessively bent, causing tube blockage. At the same time, it has sufficient rigidity to ensure that the drainage needle 3 can move the needle tip 32 through the tube and the bending sleeve 34 when pushed. It also ensures that the tube and the bending sleeve 34 can pass through the first end 21 and the bend in the middle of the inner cylinder 2, thereby ensuring that the drainage needle 3 can be used normally after entering the uterus.

[0042] The operation of one embodiment of the amniotic fluid drainage device of the present invention is as follows: First, a relatively safe amniotic puncture site is selected, and the thickness of the amniotic sac at the puncture site is considered. The position of the limiting block 31 on the drainage needle 3 is adjusted. A vaginal speculum is used to open the pregnant woman's vagina. The outer tube 1 is inserted into the pregnant woman's vagina. Then, the inner tube 2 is pushed out towards the cervix and enters the cervix. At the same time, the B-ultrasound equipment monitors the inner tube 2. After the inner tube 2 enters the uterus and abuts against the selected amniotic puncture site, the push rod 4232 is pushed towards the balloon 411, so that the first air chamber 4221 is squeezed and inflates the balloon 411, causing the balloon 411 to gradually expand. After 411 is fully inflated and presses against the fetal membrane, piston 4231 blocks the first delivery channel 431 and continues to move toward the side of airbag 411. At this time, the volume of the second airbag 411 continues to increase and forms a negative pressure, drawing the air between airbag 411 and fetal membrane into the second air chamber 4222 so that airbag 411 is tightly attached to fetal membrane. At this time, the interface on the second end of the drainage needle 3 is connected to the amniotic fluid storage device, the drainage needle 3 is pushed and the drainage needle 3 is pushed out of the inner cylinder 2 and punctures the fetal membrane until the limiting block 31 presses against the fetal membrane and the drainage needle 3 can no longer move. Then, the needle tip of the drainage needle 3 enters the fetal membrane, and the amniotic fluid is output through the drainage needle 3 for amniotic fluid drainage.

Claims

1. An amniotic fluid drainage device for obstetrics, characterized in that: The device includes an outer cylinder and an inner cylinder that are hollow inside and open at both ends. The inner cylinder has a first end and a second end, with the first end slidably disposed in the inner cavity of the outer cylinder. A drainage needle with a first end and a second end is disposed inside the inner cylinder and slidably disposed along the length direction of the inner cylinder. The second end of the drainage needle protrudes out of the inner cylinder. A positioning mechanism is provided on the inner cylinder, which is used to restrict the first end of the inner cylinder to the puncture site on the surface of the object to be punctured before puncture. The positioning mechanism includes an adsorption part disposed on the first end of the inner cylinder, a pushing part disposed on the second end of the inner cylinder, and a connecting part disposed on the inner cylinder and connecting the adsorption part and the pushing part. The pushing part operates and controls the adsorption part to adsorb onto the surface of the object to be punctured through the connecting part. The adsorption unit includes an airbag arranged circumferentially around the outer wall of the inner cylinder on the first end of the inner cylinder. The inner cavity of the airbag is connected to the connecting part. When the airbag expands through the connecting part under the action of the pushing part, the airbag unfolds at the first end of the inner cylinder so that the airbag faces away from the outer wall of the inner cylinder and adheres to the surface of the object to be punctured. The pushing unit includes an air cylinder fixed to the second end of the inner cylinder, a cavity formed inside the air cylinder and sealed around the outer wall of the inner cylinder, and a pushing member arranged along the length of the inner cylinder and slidably and sealed to the inner wall of the cavity. The first end of the air cylinder is close to the airbag. The pushing member divides the cavity into a first air chamber close to the first end of the air cylinder and a second air chamber close to the second end of the air cylinder. When the pushing member slides in the cavity, the gas in the first air chamber causes the airbag to expand or contract through the first delivery channel, and the gas in the second air chamber draws air between the surface of the punctured object and the airbag through the second delivery channel. The connecting portion includes a first delivery channel formed on the inner cylinder and respectively connecting the airbag and the propulsion portion; The connecting portion further includes a second conveying channel formed on the inner cylinder, the first end of the second conveying channel extending through to the first end of the inner cylinder, the first end of the second conveying channel being located outside the airbag, and the second end of the second conveying channel being connected to the pushing portion; The air-pushing component includes a piston that is sealed and slidably connected to the cavity, and a push rod whose first end is fixedly connected to the piston and whose second end extends out of the second end of the air cylinder along the length direction of the inner cylinder. The push rod is sealed and slidably connected to the second end of the air cylinder. The second end of the first conveying channel and the second end of the second conveying channel are both in communication with the cavity. The air-pushing component also includes a compression chamber recessed on the side of the piston near the airbag, a sealing plug movably disposed in the compression chamber and used to seal the opening of the compression chamber, and a spring disposed in the compression chamber along the length of the inner cylinder. The two ends of the spring are respectively connected to the sealing plug and the inner wall of the compression chamber. A third conveying channel with a first end connected to the compression chamber is formed on the piston. The second end of the third conveying channel extends and passes through the second end of the push rod. When the piston slides toward the airbag side, the gas in the first air chamber is pushed toward the first conveying channel to inflate the airbag. When the piston blocks the first conveying channel and continues to slide, the gas in the first air chamber is compressed and squeezes the sealing plug toward the compression chamber to make the gas in the first air chamber output through the third conveying channel. The volume in the second air chamber increases and forms a negative pressure.

2. The amniotic fluid drainage device for obstetric use as described in claim 1, characterized in that: The inner cylinder has a storage cavity that extends through both ends of the inner cylinder along its length, and the drainage needle is slidably disposed in the storage cavity.

3. The amniotic fluid drainage device for obstetric use as described in claim 2, characterized in that: The drainage needle is sealed and slidably disposed in the receiving cavity. When the pushing part runs and the first end of the inner cylinder abuts against the surface of the punctured object, the pushing part continues to run and can draw air between the surface of the punctured object and the airbag through the second delivery channel.

4. The amniotic fluid drainage device for obstetric use as described in claim 3, characterized in that: The second end of the drainage needle is movably inserted through the inner side of the push rod; the distance between the second end of the first delivery channel and the inner wall of the first end of the air cylinder is less than the length of the piston parallel to the length of the inner cylinder and greater than half of the length of the piston parallel to the length of the inner cylinder, and the second end of the second delivery channel is located close to the second end of the air cylinder.

5. The amniotic fluid drainage device for obstetric use as described in claim 1, characterized in that: Both the inner cylinder and the drainage needle are cylindrical.

6. The amniotic fluid drainage device for obstetric use as described in claim 5, characterized in that: The first end of the inner cylinder and the corresponding storage cavity, first conveying channel and second conveying channel are all inclined relative to the middle of the inner cylinder. The drainage needle includes a needle tip section that is slidably disposed in the storage cavity at the first end of the inner cylinder, a flexible tube fixedly connected to the needle tip section at one end, a drainage tube that is slidably disposed in the storage cavity at the middle of the inner cylinder and the second end of the inner cylinder and fixedly connected to the other end of the flexible tube, and a bending sleeve made of a rigid and bendable material wrapped around the flexible tube. The needle tip section and the drainage tube are both made of corrosion-resistant metal material.

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