Fluid extractor for oncology treatment

Abstract

The present invention provides a fluid extraction device for oncology treatment, comprising: a barrel (1); an insertion needle (5); a piston (4); a first one-way valve (13), which is arranged on the barrel wall and configured to allow gas to be discharged from the barrel (1) through the first one-way valve (13) but prohibit gas from entering the barrel (1) through the first one-way valve (13); and a second one-way valve (14), which is arranged in the barrel (1), between the piston (4) and the insertion needle (5), and on the side of the first one-way valve (13) close to the insertion needle (5), and the second one-way valve (14) is configured to allow gas to enter the space between the piston (4) and the second one-way valve (14) in the barrel (1) through the second one-way valve (14) but prohibit gas from being discharged to the insertion needle (5) side through the second one-way valve (14). The fluid extraction device of the present invention can extract reciprocally, so that the extraction of the fluid is more thorough and the occurrence of extraction failure can be avoided.

Description

Technical Field

[0001] The present invention relates to the field of advanced treatment equipment and services in the biomedical engineering industry, and is a device for tumor treatment, and in particular, to an effusion extractor for oncology treatment. Background Art

[0002] Generally, in the oncology department of a medical institution, a fluid extraction device is used to extract the fluid in the patient's body. When the medical staff extracts the fluid, they guide the needle of the fluid extraction device into the target part of the body and then use negative pressure to extract the fluid.

[0003] When using the existing effusion extraction device to extract the effusion, there is a problem that the extraction is not sufficient, that is, the effusion is not completely extracted. This is because the effusion is surrounded by human tissue, which may block the needle, causing the needle to be blocked and the effusion cannot be completely extracted. In addition, the existing effusion extraction device cannot extract multiple times when the needle is injected once. When the amount of effusion is large, it is expected that the effusion can be extracted once to avoid the operation of introducing the needle multiple times or replacing the needle tube. For this purpose, the effusion extraction device needs to have a larger syringe, which increases the volume of the effusion extraction device.

[0004] Furthermore, since the needle is very small, it is easy to get clogged during the extraction process. The existing fluid extraction equipment does not have a cleaning method when the needle is clogged, so subsequent extraction cannot be completed. The patient can only pull out the needle, replace the needle, and then extract again, which increases the patient's pain. Summary of the invention

[0005] The purpose of the present invention is to at least partially overcome the defects of the prior art and provide a fluid extractor for oncology treatment.

[0006] The present invention also aims to provide a fluid extractor for oncology treatment, which enables the fluid extractor to extract reciprocally, avoiding the operation of introducing a needle or replacing a needle tube multiple times.

[0007] The present invention also aims to provide a fluid extraction device for oncology treatment, so that the extraction of fluid is more thorough.

[0008] Another object of the present invention is to provide a fluid extractor for oncology treatment, which can avoid the occurrence of extraction failure.

[0009] To achieve the above purpose or one of the purposes, the technical solution of the present invention is as follows:

[0010] A fluid extractor for oncology treatment includes a barrel and an insertion needle connected to the distal end of the barrel, the insertion needle being in communication with the internal fluid of the barrel. The fluid extractor is configured to allow the accumulated fluid to enter the barrel via the insertion needle, while prohibiting the accumulated fluid from being discharged from the barrel via the insertion needle.

[0011] According to a preferred embodiment of the present invention, the effusion extractor further comprises:

[0012] A piston, wherein the piston is disposed in the cylinder;

[0013] a first one-way valve disposed on a cylinder wall of the cylinder between the piston and the insertion needle and configured to allow gas to be discharged out of the cylinder via the first one-way valve but to prohibit gas from entering the cylinder via the first one-way valve; and

[0014] A second one-way valve is arranged in the cylinder, between the piston and the insertion needle, and is located on the side of the first one-way valve close to the insertion needle, and the second one-way valve is configured to allow gas to enter the space between the piston and the second one-way valve in the cylinder through the second one-way valve but prohibit gas from being discharged to the insertion needle side through the second one-way valve.

[0015] According to a preferred embodiment of the present invention, the fluid extractor also includes an actuating portion and a piston rod, wherein the actuating portion is directly or indirectly connected to the piston rod for driving the piston rod to move longitudinally; the piston rod is located in the cylinder, and the piston is arranged on the end of the piston rod away from the actuating portion.

[0016] According to a preferred embodiment of the present invention, the second one-way valve includes a gas-permeable and liquid-tight membrane, so that gas can enter the space between the piston in the cylinder and the second one-way valve through the second one-way valve, but liquid is prevented from entering the space between the piston in the cylinder and the second one-way valve through the second one-way valve.

[0017] According to a preferred embodiment of the present invention, the effusion extractor further comprises:

[0018] a support rod disposed at the center of the insertion needle and extending from the distal end of the insertion needle into the barrel;

[0019] a sliding sleeve, which is sleeved on the support rod and extends inside the barrel and the insertion needle, and is configured to be able to slide along the support rod; and

[0020] The elastic net bag is directly or indirectly arranged on the sliding sleeve, so that the sliding of the sliding sleeve can drive the elastic net bag to change between a first contracted state and a second expanded state.

[0021] According to a preferred embodiment of the present invention, the effusion extractor further comprises:

[0022] A connecting frame is located inside the insertion needle and fixedly arranged on the end of the sliding sleeve away from the piston;

[0023] a connecting ring, located in the insertion needle and connected to the connecting frame; and

[0024] The hard tube is connected to the connecting ring and extends from the connecting ring toward the distal end of the insertion needle, and one end of the hard tube opposite to the connecting ring is connected to the elastic mesh bag.

[0025] According to a preferred embodiment of the present invention, the elastic mesh bag comprises:

[0026] a flexible bladder having a plurality of perforations to allow gas and liquid to pass therethrough;

[0027] A central support portion, disposed at the center of the flexible bladder;

[0028] A plurality of edge support portions are disposed on the inner wall of the flexible capsule; and

[0029] A plurality of springs, one end of each spring is connected to the central support portion, and the other end of each spring is connected to an edge support portion.

[0030] According to a preferred embodiment of the present invention, the effusion extractor further comprises:

[0031] A stud having a rotating head disposed on an end thereof;

[0032] a lifting sleeve, the lifting sleeve being in clearance fit with the rotating head and the rotational movement of the lifting sleeve being restricted; and

[0033] A push rod, one end of which is hinged on the lifting sleeve, and the other end of which is hinged on the sliding sleeve.

[0034] Wherein, a screw hole is arranged on the wall surface of the cylinder between the second one-way valve and the insertion needle, and the stud is screwed in the screw hole.

[0035] According to a preferred embodiment of the present invention, a locking nut is provided on the stud, and the locking nut is located between the nut of the stud and the outer wall of the barrel;

[0036] The rotating head is T-shaped, the lifting sleeve is wrapped around the periphery of the rotating head, and the accumulated liquid extractor also includes a sealing hose, which is arranged between the lifting sleeve and the inner wall of the cylinder.

[0037] According to a preferred embodiment of the present invention, the support rod is a rotating rod, and the effusion extractor further comprises:

[0038] a filter mesh disposed in the distal end of the insertion needle; and

[0039] A cleaning rod is arranged on the end of the rotating rod and abuts against the outer side of the filter screen.

[0040] The rotating rod can be driven to rotate, so that the cleaning rod rotates around the axis of the rotating rod to clean the filter screen.

[0041] According to a preferred embodiment of the present invention, the effusion extractor further comprises:

[0042] A push rod is arranged on the surface of the piston facing the second one-way valve, and the surface of the push rod away from the piston is an inclined surface;

[0043] The U-shaped rod comprises: two vertically extending first rod portions and a second rod portion; and a horizontal rod portion connecting the first rod portion and the second rod portion;

[0044] a wedge-shaped portion, disposed on an end of the first rod portion of the U-shaped rod and having an inclined surface facing the push rod;

[0045] a rack disposed on an end of the second rod portion of the U-shaped rod; and

[0046] The gear is fixed on the rotating rod and cooperates with the rack.

[0047] There is an activity space in the inner wall of the cylinder, and the horizontal rod is arranged in the activity space and is allowed to move in the activity space.

[0048] According to a preferred embodiment of the present invention, the effusion extractor further comprises an elastic telescopic portion, and the elastic telescopic portion is arranged between the surface of the wedge-shaped portion facing the cylinder and the inner wall of the cylinder.

[0049] According to a preferred embodiment of the present invention, the effusion extractor further comprises a detachable receiving portion disposed on the barrel wall of the barrel between the second one-way valve and the insertion needle.

[0050] According to the oncology treatment fluid extractor of the present invention, two one-way valves are provided for it, namely, a first one-way valve and a second one-way valve. The first one-way valve is located between the piston and the insertion needle, and the second one-way valve is located between the first one-way valve and the insertion needle. The first one-way valve only allows gas to be discharged from the cylinder through the first one-way valve and prohibits gas from entering the cylinder through the first one-way valve. The second one-way valve only allows gas to enter the space between the piston and the second one-way valve in the cylinder through the second one-way valve and prohibits gas from being discharged to the insertion needle side through the second one-way valve. Through such a setting, when the piston is pulled by the actuator, the left and right sides of the second one-way valve are gas-connected, so that pressure transmission can be achieved, allowing the effusion in the patient's body to be sucked into the cylinder through the insertion needle, and the first one-way valve is closed at this time; and when the actuator pushes the piston, the first one-way valve opens, allowing gas to be discharged from the cylinder, but the second one-way valve is closed at this time, and the extracted effusion or gas will not enter the patient's body. In this way, the fluid extraction device can extract multiple times with one insertion needle, without changing the needle tube, or pulling out the needle and re-introducing a new needle. Therefore, it is very practical in the extraction of a large amount of fluid, which can reduce the pain of the patient, improve the extraction efficiency, and reduce the operating burden.

[0051] By utilizing the fluid extractor for oncology treatment of the present invention, the extracted fluid does not exist in the cylinder, but is introduced into a storage portion (such as a storage bag) connected to the cylinder. Therefore, the cylinder does not need to have a large volume, and can be connected to storage bags of different volumes according to actual needs, thereby reducing the volume of the extractor.

[0052] In addition, the fluid extraction device for oncology treatment of the present invention is designed to have an elastic mesh bag that can change its state. Specifically, the elastic mesh bag can shrink back into the insertion needle, and can also extend from the insertion needle and unfold. During the process of introducing the insertion needle into the patient's body, the elastic mesh bag retracts into the insertion needle. When the insertion needle is in place and ready for fluid extraction, the elastic mesh bag is driven to expand through a mechanical linkage structure. The expanded volume is larger than the volume of the insertion needle head. The elastic mesh bag can be used to expand and push away human tissue at the fluid accumulation site, so that the fluid accumulates together for easy extraction. Moreover, because the human tissue is pushed away, it can avoid blocking the insertion needle of the extractor. Therefore, the fluid can be extracted very thoroughly.

[0053] Furthermore, the fluid extraction device for oncology treatment of the present invention includes a filter screen arranged at the head of the insertion needle, and the filter screen can filter solids in the effusion to prevent the solids from entering the insertion needle and blocking the insertion needle, thereby making it impossible to perform subsequent effusion extraction. A series of components such as a piston rod and a push rod driven by an actuator drive the cleaning rod on the filter screen to scrape the filter screen to remove the solids on the filter screen. The filter screen is scraped on each stroke of the piston, and the scraping action is performed before each extraction and when the piston returns to the extreme position before extraction preparation, which means that the filter screen can be cleaned before each extraction operation of the piston, thereby enabling the extraction of the effusion to proceed smoothly and avoiding extraction failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 is a schematic structural diagram of a certain state of the effusion extractor for oncology treatment according to an embodiment of the present invention, wherein the elastic mesh bag of the effusion extractor for oncology treatment is in a first contracted state;

[0055] Figure 2 for Figure 1 Magnified view of the circular area in ;

[0056] Figure 3 for Figure 1 A magnified view of the right area in

[0057] Figure 4 is a schematic structural diagram of another state of the effusion extractor for oncology treatment according to an embodiment of the present invention, wherein the elastic mesh bag of the effusion extractor for oncology treatment is in a second expanded state;

[0058] Figure 5 for Figure 4 A magnified view of the circular area in ; and

[0059] Figure 6 for Figure 4 Magnified view of the right area in . DETAILED DESCRIPTION

[0060] Exemplary embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements. In addition, in the detailed description below, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of the disclosed embodiments. However, it is apparent that one or more embodiments may also be implemented without these specific details. In other cases, known structures and devices are embodied in a schematic manner to simplify the accompanying drawings.

[0061] According to the overall inventive concept of the present invention, there is provided a fluid extractor for oncology treatment, comprising a barrel and an insertion needle connected to the distal end of the barrel, the insertion needle being in communication with the internal fluid of the barrel, the fluid extractor being configured to allow the accumulated fluid to enter the barrel through the insertion needle, while prohibiting the accumulated fluid from being discharged from the barrel through the insertion needle.

[0062] Figure 1 A fluid extractor for oncology treatment according to an embodiment of the present invention is shown, which mainly includes a barrel 1, an insertion needle 5 and a accommodating portion 6. The barrel 1 is roughly cylindrical and has a accommodating space, and an actuating portion 2, a piston rod 3 and a piston 4 are arranged in the barrel 1. One end of the piston rod 3 is directly or indirectly connected to the actuating portion 2, and the other end of the piston rod 3 is connected to the piston 4. The actuating portion 2 can be a hydraulic cylinder, which drives the piston rod 3 and the piston 4 to move in the barrel 1. The insertion needle 5 is connected to the distal end of the barrel 1 (that is, the end away from the operator when in use), and the insertion needle 5 is connected to the internal fluid of the barrel 1.

[0063] In order to allow the piston to reciprocate and extract multiple times, it is necessary that the accumulated fluid enters the cylinder when the piston is pulled backward, and the pressure in the cylinder will not be transmitted to the human body or the insertion needle when the piston is pushed forward. In this way, the accumulated fluid extractor is configured to allow the accumulated fluid to enter the cylinder 1 through the insertion needle 5, while prohibiting the accumulated fluid from being discharged from the cylinder 1 through the insertion needle 5. Specifically, the effusion extractor is configured to include: a first one-way valve 13, which is arranged on the cylinder wall of the cylinder 1 between the piston 4 and the insertion needle 5, and is configured to allow gas to be discharged from the cylinder 1 through the first one-way valve 13 but prohibit gas from entering the cylinder 1 through the first one-way valve 13; and a second one-way valve 14, which is arranged in the cylinder 1, between the piston 4 and the insertion needle 5, and is located on the side of the first one-way valve 13 close to the insertion needle 5, and the second one-way valve 14 is configured to allow gas to enter the space between the piston 4 and the second one-way valve 14 in the cylinder 1 through the second one-way valve 14 but prohibit gas from being discharged to the insertion needle 5 side through the second one-way valve 14. Among them, the second one-way valve 14 is located on the right side of the first one-way valve 13, and they are both between the piston 4 and the insertion needle 5. The one-way valve for achieving one-way communication belongs to the prior art, and its specific structure is not described here. When the actuator pulls the piston, the second one-way valve 14 is turned on and the first one-way valve 13 is closed, and the negative pressure can be transmitted to the insertion needle, so that the insertion needle can extract the accumulated fluid; when the actuator pushes the piston, the second one-way valve 14 is closed, and neither gas nor liquid can pass through it, and the first one-way valve 13 is opened, and the air pressure is released through the first one-way valve 13, allowing the piston 4 to return to the starting position for extraction.

[0064] Preferably, the second one-way valve 14 includes a gas-permeable and liquid-impermeable membrane, so that gas can enter the space between the piston 4 and the second one-way valve 14 in the cylinder 1 through the second one-way valve 14, but liquid is prevented from entering the space between the piston 4 and the second one-way valve 14 in the cylinder 1 through the second one-way valve 14. In this way, when the second one-way valve 14 is closed (i.e., when the piston is pushed), due to the closing effect of the second one-way valve 14 itself, neither gas nor liquid can pass through it; and when the second one-way valve 14 is opened (i.e., when the piston is pulled), only gas can pass through it, but the accumulated fluid extracted from the body cannot pass through the second one-way valve 14 to enter the piston side. Pressure transmission can be achieved with the passage of gas, and the accumulated fluid can be extracted. In this way, it can be avoided that the accumulated fluid contaminates the piston and affects the operation of the piston.

[0065] The storage part 6 can be a disposable storage bag, which can be detachably arranged on the wall of the cylinder 1 between the second one-way valve 14 and the insertion needle 5. The storage part 6 can be fixed on the wall of the cylinder 1 by screwing or clamping means. The storage part 6 can have different specifications and sizes, suitable for extracting different types of effusions, and a scale is provided on the storage part 6 for calibrating the amount of effusion extracted. The storage part 6 itself has a self-closing valve. When the effusion is extracted, the storage part 6 opens, and the effusion enters the storage part 6 through the insertion needle 5 and the cylinder 1; when the piston is reset, the storage part 6 is closed.

[0066] A plurality of first one-way valves 13 may be arranged around the outer circumference of the cylinder 1 and evenly distributed on the outer circumference of the cylinder 1 to evenly exhaust the gas.

[0067] The elastic mesh bag and the transmission part of the fluid extractor for oncology treatment of the present invention are introduced below.

[0068] The effusion extractor is provided with a stud 19, a lifting sleeve 18, a push rod 17, a rotating rod 15 (support rod), a sliding sleeve 16, an elastic mesh bag 27, a connecting frame 22, a connecting ring 23 and a hard tube. The stud 19 is a stud with a nut, and a rotating head 31 is provided on the end of the stud 19. The rotating head 31 can be integrated with the stud, or the two are different components, which are connected together by connecting means. For example, a threaded hole can be provided on the lower side of the stud, and a stud part is provided on the upper surface of the rotating head 31. They are connected together by the combination of the stud part and the threaded hole. A screw hole is provided on the wall surface of the cylinder 1 between the second one-way valve 14 and the insertion needle 5, and the stud 19 is screwed into the screw hole, such as Figure 2When the stud 19 and the rotating head 31 are integrated, the nut of the stud 19 and the stud body should be separate, so as to facilitate the stud to be screwed into the screw hole on the wall of the barrel 1; when the two are separate, the nut of the stud 19 and the stud body can be integrated, in which case the stud 19 is screwed into the screw hole from the outside of the barrel 1 and then combined with the rotating head 31.

[0069] The lifting sleeve 18 is fitted with the rotating head 31 in a clearance, and the rotational movement of the lifting sleeve 18 is limited. Two limit baffles can be set on the lower side of the aforementioned screw hole of the cylinder 1. The limit baffles extend vertically downward from the inner wall of the cylinder 1, and the lifting sleeve 18 is located between the two limit baffles. The outer contour of the lifting sleeve 18 is a rectangular parallelepiped shape, the top surface of which has an opening and the interior is hollow. The shape of the rotating head 31 is T-shaped, with a horizontal section and a vertical section. The horizontal section and the vertical section are both cylindrical in shape, except that the circumferential diameter of the horizontal section is larger than the circumferential diameter of the vertical section. The lifting sleeve 18 is wrapped around the periphery of the rotating head 31, and the shape of the hollow interior of the lifting sleeve 18 is also roughly T-shaped, with a horizontal section and a vertical section corresponding to the horizontal section and the vertical section of the rotating head 31, but the volume of the hollow interior is slightly larger than the volume of the rotating head 31, so as to allow the rotating head 31 to rotate in the lifting sleeve 18.

[0070] The rotating rod 15 is arranged at the center of the insertion needle 5, extending from the distal end of the insertion needle 5 into the barrel 1, and the sliding sleeve 16 is sleeved on the rotating rod 15 and extends in the barrel 1 and the insertion needle 5, and the length of the sliding sleeve 16 is less than the length of the rotating rod 15. The sliding sleeve 16 is configured to be able to slide relatively along the rotating rod 15, one end of the rotating rod 15 is supported on the inner wall of the barrel 1 by a bearing assembly, and the other end of the rotating rod 15 is supported on the inner wall of the insertion needle 5. The support of the rotating rod 15 in the insertion needle 5 can be achieved by a circular ring component and a support body extending radially outward from the circular ring component. A plurality of support bodies are evenly arranged on the outer circumference of the circular ring component, and the distal end of the support body is fixed on the inner wall of the insertion needle 5. The rotating rod 15 can rotate in the ring of the circular ring component. A plurality of bearing assemblies and circular ring components can be provided according to actual support needs.

[0071] Preferably, a locking nut 20 is provided on the stud 19, and the locking nut 20 is located between the nut of the stud 19 and the outer wall of the barrel 1, and the locking nut 20 is used to lock the stud 19 to prevent it from moving. When the effusion extractor of the present invention is not opened, the locking nut 20 is locked, and the stud 19 cannot move at this time. When in use, when the insertion needle 5 is introduced into the target part of the human body, it is necessary to contact the locking of the locking nut 20, and after the elastic mesh bag 27 is expanded, the locking nut 20 can also be tightened to prevent the stud 19 from moving.

[0072] See also Figure 2 and 5The effusion extractor further comprises a sealing hose 21, which is arranged between the lifting sleeve 18 and the inner wall of the cylinder 1 and is used to seal the screw hole of the cylinder 1 to prevent the effusion from leaking out.

[0073] One end of the push rod 17 is hinged on the lifting sleeve 18, and the other end is hinged on the sliding sleeve 16. The end of the sliding sleeve 16 away from the push rod 17 is connected with a connecting frame 22. The connecting frame 22 is located in the insertion needle 5 and is fixedly arranged on the end of the sliding sleeve 16 away from the piston 4. The connecting frame 22 is a hollow disc-shaped frame, which does not hinder the passage of the effusion through the insertion needle. The connecting ring 23 is located in the insertion needle 5 and is connected to the outer periphery of the connecting frame 22. The hard tube 24 is directly connected to the connecting ring 23, extending from the connecting ring 23 toward the distal end of the insertion needle 5, and the end of the hard tube 24 opposite to the connecting ring 23 is connected to the elastic mesh bag 27. The hard tube 24 can also be replaced by a frame, as long as the frame can extend from the connecting ring 23 to the needle port direction. If the hard tube 24 is used, preferably, a plurality of through holes are arranged on the wall surface of the hard tube 24 to increase the permeability of the effusion.

[0074] The elastic mesh bag 27 is arranged on the edge of the hard tube 24, so that the sliding of the sliding sleeve 16 can drive the elastic mesh bag 27 to change between the first contracted state and the second expanded state. The elastic mesh bag 27 includes: a flexible bag having a plurality of penetration holes to allow gas and liquid to pass through; a central support portion 28 arranged at the center of the flexible bag; a plurality of edge support portions 30 arranged on the inner wall of the flexible bag; and a plurality of springs 29, one end of each spring is connected to the central support portion 28, and the other end is connected to one edge support portion 30. The central support portion 28 and the edge support portion 30 can be a connecting ring or a connecting ball.

[0075] The following is an introduction to the transmission of the contraction and expansion of the elastic mesh bag 27. When the product is not unpacked, the elastic mesh bag 27 is contracted at the end of the insertion needle 5. Figure 1 , 3 . The function of the elastic mesh bag 27 is to expand and push away the human tissue at the site of fluid accumulation when in use, so that the accumulated fluid accumulates together and is easy to extract. Therefore, after the insertion needle 5 is introduced into the human body, the elastic mesh bag 27 needs to be expanded. Therefore, the operator releases the lock of the locking nut 20 and rotates the stud 19. The stud 19 drives the rotating head 31 to rotate. At the same time, the stud 19 moves downward, driving the upper end of the push rod 17 to move downward. The push rod 17 acts as a connecting rod. Therefore, the other end of the push rod 17 pushes the sliding sleeve 16 to move to the right, and then drives the connecting frame 22, the connecting ring 23 and the hard tube 24 to move to the right. Then the elastic mesh bag 27 extends from the needle port of the insertion needle 5; after the elastic mesh bag 27 extends from the needle port, it is no longer constrained by the inner wall of the needle port. Therefore, under the action of its own spring 29, the flexible bag is expanded, see Figure 6 .

[0076] A storage space for the elastic mesh bag 27 is prefabricated at the needle port of the insertion needle 5. The size of the storage space is adapted to the size of the elastic mesh bag 27 when it is contracted. Advantageously, the storage space is in the shape of a cone. The closer to the needle port, the larger the diameter of the storage space. This is conducive to the outward release and inward contraction of the elastic mesh bag 27 because it can be guided by the outer peripheral surface of the cone. The edge of the needle port of the insertion needle 5 is smoothly chamfered to reduce the stress acting on the elastic mesh bag 27 when it is stretched. As an example, the edge of the needle port of the insertion needle 5 is provided with a rubber ring to provide buffer support for the flexible bag. The flexible bag can have different shapes, not limited to the spherical shape shown in the figure, and can also adopt flexible bags of different shapes according to different parts of the body, for example, a slender strip.

[0077] In a further preferred embodiment, a strip is provided on the inner wall of the rigid tube 24, for example, three strips are provided on the circumference of the inner wall, and the distal end of the strip (i.e., the end away from the rigid tube) is connected to the inner wall of the flexible bladder, preferably, connected to the inner wall of the flexible bladder. Figure 6 The bottom edge of the right 1 / 3 of the spherical flexible bag that is stretched out in the middle is arranged so that when the sliding sleeve 16 is pulled to the left, the pulling force of the hard tube 24 acts more evenly on the entire flexible bag, and the flexible bag can be smoothly pulled back into the accommodating space at the needle port of the insertion needle.

[0078] As described in the background technology section, the insertion needle 5 is easily clogged during actual use. For this reason, preferably, a filter screen 25 is provided at the head of the insertion needle. The filter screen 25 is provided at the distal end of the insertion needle 5. The filter screen 25 is in the shape of a disk, and the center of the disk has a through hole. The rotating rod 15 passes through the through hole, and the filter screen is provided with a certain support by the rotating rod 15. The filter screen 25 is divided into two separate parts: a disk located in the center and a ring on the outer circumference of the disk. The disk is supported by the rotating rod 15, and the ring is combined with the inner wall of the insertion needle 5. There is a gap between the disk and the ring, and the gap is used for the hard tube 24 to pass through.

[0079] In an alternative embodiment, the filter screen 25 is an integrated filter screen, which is supported and fixed by the inner wall of the rotating rod 15 and the insertion needle 5. The filter screen 25 is provided with a plurality of circular holes evenly distributed along the circumference. The front end of the hard tube 24 (i.e., the end close to the elastic mesh bag 27) is provided with a plurality of cylindrical legs. The cylindrical legs extend through the circular holes and can slide in the circular holes. The front end of the cylindrical legs is connected to the flexible bag of the elastic mesh bag 27.

[0080] In the technical solution using the filter 25, the filter is easily clogged by solid matter in the accumulated liquid. The present invention provides a technical means for cleaning the filter. Specifically,

[0081] The effusion extractor also includes a cleaning rod 26, which is arranged on the end of the rotating rod 15 and abuts against the outer side of the filter 25. The rotating rod 15 can be driven to rotate so that the cleaning rod 26 rotates around the axis of the rotating rod 15 to clean the filter 25.

[0082] The rotation of the rotating rod 15 is achieved in this way: a push rod 7, a U-shaped rod 8, a wedge-shaped portion 8, a rack 10 and a gear 11 are arranged in the cylinder 1. The push rod 7 is arranged on the surface of the piston 4 facing the second one-way valve 14, and the surface of the push rod 17 away from the piston 4 is an inclined surface; the U-shaped rod 8 includes: two vertically extending first rod parts and second rod parts; and a horizontal rod part connecting the first rod part and the second rod part; the wedge-shaped portion 8 is arranged on the end of the first rod part of the U-shaped rod 8 and has an inclined inclined surface facing the push rod 7; the rack 10 is arranged on the end of the second rod part of the U-shaped rod 8; and the gear 11 is fixedly arranged on the rotating rod 15 and cooperates with the rack 10. There is an active space in the inner wall of the cylinder 1, and the horizontal rod part is arranged in the active space and is allowed to move in the active space. Two sets of downwardly extending slideways are provided on the inner wall of the cylinder 1, and each set of slideways accommodates a vertically extending rod (first rod or second rod). The slideways can limit the U-shaped rod 8 to move only up and down in the vertical direction. The movable space in the inner wall of the cylinder 1 is composed of a groove and a closing cover located on the groove. The horizontal rod is accommodated in the groove, and the vertical rod passes through the groove. The first rod and the second rod are respectively located on both sides of the second one-way valve 14. The side of the wedge-shaped portion 8 away from the push rod 7 is supported on the surface of the second one-way valve 14.

[0083] The effusion extractor further comprises an elastic telescopic portion 12, which is arranged between the surface of the wedge-shaped portion 8 facing the cylinder 1 and the inner wall of the cylinder 1. The elastic telescopic portion 12 can be a spring or an elastic bellows, which provides a vertical downward force for the wedge-shaped portion 8, so that in the absence of external force, the wedge-shaped portion 8 is located at a low position, and the horizontal rod portion is supported on the closing cover.

[0084] The working process of the cleaning rod 26 is:

[0085] The initial position of the U-shaped rod 9 is: the horizontal rod portion is located at the lowest end and supported on the closing cover, and the wedge-shaped portion 8 and the like are all located at the lowest end; when the piston is pulled backwards and suction is completed once, when suction is required again, the piston is pushed forward, and the first one-way valve 13 exhausts air outwards until the push rod 7 in front of the piston contacts the inclined surface of the wedge-shaped portion 8; further pushing of the piston causes the wedge-shaped portion 8 to drive the U-shaped rod 9 to move upward, and thus the rack 10 also moves upward; the movement of the rack 10 causes the gear 11 to rotate, thereby driving the rotating rod 15 to rotate, driving the cleaning rod 26 to rotate, thereby scraping the filter screen 25.

[0086] After the piston reaches the dead point, the piston retreats, and the wedge-shaped portion 8 moves downward under the action of the elastic telescopic portion 12, driving the U-shaped rod 9 to move downward, driving the rack 10 to move downward, causing the gear 11 to rotate in the opposite direction, driving the rotating rod 15 to rotate in the opposite direction, driving the cleaning rod 26 to rotate in the opposite direction, and scraping the filter screen 25 again.

[0087] Appropriate sealing means need to be considered at the connection between the closing cover and the U-shaped rod 9, and at the connection between the U-shaped rod and the groove. One feasible way is to use an elastic bellows at the first rod portion and an ordinary bellows at the second rod portion, one end of the bellows is connected to the inner wall of the cylinder 1, and the other end is connected to the rod body of the second rod portion.

[0088] According to the oncology treatment fluid extractor of the present invention, two one-way valves are provided for it, namely, a first one-way valve and a second one-way valve. The first one-way valve is located between the piston and the insertion needle, and the second one-way valve is located between the first one-way valve and the insertion needle. The first one-way valve only allows gas to be discharged from the cylinder through the first one-way valve and prohibits gas from entering the cylinder through the first one-way valve. The second one-way valve only allows gas to enter the space between the piston and the second one-way valve in the cylinder through the second one-way valve and prohibits gas from being discharged to the insertion needle side through the second one-way valve. Through such a setting, when the piston is pulled by the actuator, the left and right sides of the second one-way valve are gas-connected, so that pressure transmission can be achieved, allowing the effusion in the patient's body to be sucked into the cylinder through the insertion needle, and the first one-way valve is closed at this time; and when the actuator pushes the piston, the first one-way valve opens, allowing gas to be discharged from the cylinder, but the second one-way valve is closed at this time, and the extracted effusion or gas will not enter the patient's body. In this way, the fluid extraction device can extract multiple times with one insertion needle, without changing the needle tube, or pulling out the needle and re-introducing a new needle. Therefore, it is very practical in the extraction of a large amount of fluid, which can reduce the pain of the patient, improve the extraction efficiency, and reduce the operating burden.

[0089] By utilizing the fluid extractor for oncology treatment of the present invention, the extracted fluid does not exist in the cylinder, but is introduced into a storage portion (such as a storage bag) connected to the cylinder. Therefore, the cylinder does not need to have a large volume, and can be connected to storage bags of different volumes according to actual needs, thereby reducing the volume of the extractor.

[0090] In addition, the fluid extraction device for oncology treatment of the present invention is designed to have an elastic mesh bag that can change its state. Specifically, the elastic mesh bag can shrink back into the insertion needle, and can also extend from the insertion needle and unfold. During the process of introducing the insertion needle into the patient's body, the elastic mesh bag retracts into the insertion needle. When the insertion needle is in place and ready for fluid extraction, the elastic mesh bag is driven to expand through a mechanical linkage structure. The expanded volume is larger than the volume of the insertion needle head. The elastic mesh bag can be used to expand and push away human tissue at the fluid accumulation site, so that the fluid accumulates together for easy extraction. Moreover, because the human tissue is pushed away, it can avoid blocking the insertion needle of the extractor. Therefore, the fluid can be extracted very thoroughly.

[0091] Furthermore, the fluid extraction device for oncology treatment of the present invention includes a filter screen arranged at the head of the insertion needle, and the filter screen can filter solids in the effusion to prevent the solids from entering the insertion needle and blocking the insertion needle, thereby making it impossible to perform subsequent effusion extraction. A series of components such as a piston rod and a push rod driven by an actuator drive the cleaning rod on the filter screen to scrape the filter screen to remove the solids on the filter screen. The filter screen is scraped on each stroke of the piston, and the scraping action is performed before each extraction and when the piston returns to the extreme position before extraction preparation, which means that the filter screen can be cleaned before each extraction operation of the piston, thereby enabling the extraction of the effusion to proceed smoothly and avoiding extraction failure.

[0092] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes may be made to these embodiments without departing from the principles and spirit of the present invention. The scope of application of the present invention is defined by the appended claims and their equivalents.

[0093] List of reference numerals:

[0094] 1 Cylinder

[0095] 2 Actuator

[0096] 3 Piston rod

[0097] 4 Piston

[0098] 5 Insert the needle

[0099] 6 Storage Department

[0100] 7 Push rod

[0101] 8 Wedge

[0102] 9 U-shaped rod

[0103] 10 Rack

[0104] 11 Gear

[0105] 12 Elastic expansion part

[0106] 13 First check valve

[0107] 14 Second check valve

[0108] 15 Rotating rod

[0109] 16 Slide

[0110] 17 Putter

[0111] 18 Lifting sleeve

[0112] 19 Studs

[0113] 20 Lock nut

[0114] 21 Sealing hose

[0115] 22 Connection frame

[0116] 23 Connecting ring

[0117] 24 Hard pipe

[0118] 25 Filter

[0119] 26 Cleaning rod

[0120] 27 Elastic mesh bag

[0121] 28 Center support

[0122] 29 Spring

[0123] 30 Edge support

[0124] 31 Rotate your head.

Claims

1. A fluid extractor for oncology treatment, comprising a barrel (1) and an insertion needle (5) connected to the distal end of the barrel (1), wherein the insertion needle (5) is in fluid communication with the interior of the barrel (1), characterized in that: The effusion extractor is configured to allow the effusion to enter the barrel (1) via the insertion needle (5), while prohibiting the effusion from being discharged from the barrel (1) via the insertion needle (5); The effusion extractor further comprises: A piston (4), wherein the piston (4) is arranged in the cylinder (1); a first one-way valve (13), which is disposed on a cylinder wall of the cylinder (1) between the piston (4) and the insertion needle (5) and is configured to allow gas to be discharged from the cylinder (1) via the first one-way valve (13) but prohibit gas from entering the cylinder (1) via the first one-way valve (13); and a second one-way valve (14) disposed in the cylinder (1), between the piston (4) and the insertion needle (5), and located on a side of the first one-way valve (13) close to the insertion needle (5), and the second one-way valve (14) is configured to allow gas to enter the space between the piston (4) and the second one-way valve (14) in the cylinder (1) through the second one-way valve (14) but prohibit gas from being discharged to the insertion needle (5) side through the second one-way valve (14), The second one-way valve (14) comprises a gas-permeable but liquid-impermeable membrane, so that gas can enter the space between the piston (4) and the second one-way valve (14) in the cylinder (1) through the second one-way valve (14), but liquid is prevented from entering the space between the piston (4) and the second one-way valve (14) in the cylinder (1) through the second one-way valve (14).

2. The effusion extractor for oncology treatment according to claim 1, characterized in that: The effusion extractor further comprises an actuating portion (2) and a piston rod (3), wherein the actuating portion (2) is directly or indirectly connected to the piston rod (3) and is used to drive the piston rod (3) to move longitudinally; the piston rod (3) is located in the cylinder (1), and the piston (4) is arranged on the end of the piston rod (3) away from the actuating portion (2).

3. The effusion extractor for oncology treatment according to claim 2, characterized in that: The effusion extractor further comprises: A support rod, disposed at the center of the insertion needle (5), extending from the distal end of the insertion needle (5) into the barrel (1); a sliding sleeve (16), the sliding sleeve (16) being sleeved on the support rod and extending inside the barrel (1) and the insertion needle (5), and the sliding sleeve (16) being configured to be able to slide along the support rod; and The elastic net bag (27) is directly or indirectly arranged on the sliding sleeve (16), so that the sliding of the sliding sleeve (16) can drive the elastic net bag (27) to change between a first contracted state and a second expanded state.

4. The effusion extractor for oncology treatment according to claim 3, characterized in that: The effusion extractor further comprises: A connecting frame (22) is located inside the insertion needle (5) and is fixedly arranged on the end of the sliding sleeve (16) away from the piston (4); A connecting ring (23) is located inside the insertion needle (5) and connected to the connecting frame (22); and A hard tube (24) is connected to the connecting ring (23) and extends from the connecting ring (23) toward the distal end of the insertion needle (5), and the end of the hard tube (24) opposite to the connecting ring (23) is connected to the elastic mesh bag (27).

5. The effusion extractor for oncology treatment according to claim 4, characterized in that: The elastic mesh bag (27) comprises: a flexible bladder having a plurality of perforations to allow gas and liquid to pass therethrough; A central support portion (28) disposed at the center of the flexible bladder; A plurality of edge support portions (30) are arranged on the inner wall of the flexible capsule; and A plurality of springs (29), one end of each spring is connected to the central support portion (28), and the other end is connected to an edge support portion (30).

6. The effusion extractor for oncology treatment according to claim 5, characterized in that: The effusion extractor further comprises: A stud (19), wherein a rotating head (31) is provided at the end of the stud (19); A lifting sleeve (18), wherein the lifting sleeve (18) is clearance-matched with the rotating head (31), and the rotational movement of the lifting sleeve (18) is restricted; and A push rod (17), one end of which is hinged on the lifting sleeve (18), and the other end of which is hinged on the sliding sleeve (16). A screw hole is provided on the wall surface of the cylinder (1) between the second one-way valve (14) and the insertion needle (5), and the screw bolt (19) is screwed into the screw hole.

7. The effusion extractor for oncology treatment according to claim 6, characterized in that: The stud (19) is provided with a locking nut (20), and the locking nut (20) is located between the nut of the stud (19) and the outer wall of the barrel (1); The rotating head (31) is T-shaped, the lifting sleeve (18) is wrapped around the periphery of the rotating head (31), and the effluent extractor also includes a sealing hose (21), and the sealing hose (21) is arranged between the lifting sleeve (18) and the inner wall of the cylinder (1).

8. The effusion extractor for oncology treatment according to any one of claims 1 to 7, characterized in that: The effusion extractor further comprises a detachable receiving portion (6) which is arranged on the wall of the barrel (1) between the second one-way valve (14) and the insertion needle (5).

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