CN114404689A - Fluid extraction device for oncology treatment - Google Patents

Abstract

The invention provides an effusion extractor for oncology treatment, comprising: a cylinder body (1); an insertion needle (5); a piston (4); is configured to allow gas to exit the cylinder (1) via a 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) , 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 The 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) via the second one-way valve (14) but to prohibit the passage of gas via the second one-way valve (14) The valve (14) is discharged to the side of the insertion needle (5). The effusion extractor of the present invention can reciprocate extraction, so that the effusion can be extracted more thoroughly and the phenomenon of extraction failure can be avoided.

Description

Fluid extraction device for oncology treatment

technical field

The invention relates to the advanced treatment equipment and service field in the biomedical engineering industry, is a device for tumor treatment, and in particular relates to an effusion extractor for oncology treatment.

Background technique

Generally, in the oncology department of a medical institution, a fluid extraction device is used to extract fluid from a patient's body. When the medical staff performs fluid extraction, the needle of the fluid extraction device is introduced into the target part of the body, and then the fluid is drawn out by negative pressure.

When using the existing effusion extraction equipment to extract the effusion, there is a problem that the effusion cannot be fully extracted, that is, the effusion is not fully extracted. This is because the body tissue around the effusion may block the needle and cause the needle to be sealed. The effusion cannot be completely drained. In addition, the existing effusion extraction equipment cannot extract multiple times when the needle is injected into the needle at one time, and in the case of a large amount of effusion, it is expected that the effusion can be extracted at one time, so as to avoid the need to repeatedly introduce the needle or replace the needle tube. For operation, the effusion extraction device is required to have a larger syringe, which increases the volume of the effusion extraction device.

Further, because the needle is very small, it is easy to be blocked during the extraction process. The existing effusion extraction equipment does not have cleaning means when the needle is blocked, so subsequent extraction cannot be completed, and the needle can only be pulled out and replaced. It is then redrawn, which adds to the patient's suffering.

SUMMARY OF THE INVENTION

The purpose of the present invention is to at least partially overcome the defects of the prior art, and to provide an effusion extractor for oncology treatment.

Another object of the present invention is to provide an effusion extractor for oncology treatment, so that the effusion extractor can be reciprocally extracted, and the operation of repeatedly introducing a needle or replacing a needle tube is avoided.

Another object of the present invention is to provide an effusion extractor for oncology treatment, so that the effusion can be extracted more thoroughly.

Another object of the present invention is to provide an effusion extractor for oncology treatment, which can avoid the occurrence of extraction failure.

In order to achieve the above-mentioned purpose or one of the purposes, the technical solution of the present invention is as follows:

An oncology treatment effusion extractor includes a barrel and an insertion needle connected to a distal end of the barrel, the insertion needle being in fluid communication with the interior of the barrel, the effusion extractor configured to allow accumulation of The fluid enters the barrel through the insertion needle, while the drainage of the accumulated fluid from the barrel through the insertion needle is prohibited.

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

a piston, the piston is arranged in the cylinder;

a first one-way valve disposed on the barrel wall between the piston and the insertion needle and configured to allow gas to exit the barrel via the first one-way valve but prohibit gas from passing through the barrel the first one-way valve enters the barrel; and

A second one-way valve disposed within the barrel between the piston and the insertion needle and on a side of the first one-way valve proximate the insertion needle and configured to allow gas to pass through the second one-way valve The one-way valve enters the space in the barrel between the piston and the second one-way valve but prohibits the exhaust of gas to the side of the insertion needle via the second one-way valve.

According to a preferred embodiment of the present invention, the effusion extractor further comprises an actuating part and a piston rod, the actuating part is directly or indirectly connected with the piston rod, and is used to drive the piston rod to move longitudinally; the piston The rod is located within the barrel and the piston is provided on the end of the piston rod remote from the actuating portion.

According to a preferred embodiment of the present invention, the second one-way valve includes a gas-permeable and liquid-tight membrane, so that the gas can enter the space between the piston and the second one-way valve in the cylinder through the second one-way valve, but the liquid is blocked by the second one-way valve. Access to the space between the piston and the second one-way valve in the barrel is prevented via the second one-way valve.

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

a support rod, arranged in the center of the insertion needle, extending from the distal end of the insertion needle into the barrel;

a sliding sleeve sleeved on the support rod and extending within the barrel and the insertion needle, and the sliding sleeve is configured to be slidable along the support rod; and

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

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

The connecting frame is located in the insertion needle and fixedly arranged on the end of the sliding sleeve away from the piston;

a connecting ring located within the insertion needle and connected to the connecting frame; and

A rigid tube connected to the connecting ring extends from the connecting ring toward the distal end of the insertion needle, and the end of the rigid tube opposite to the connecting ring is connected to the elastic mesh bag.

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

Flexible bladder with multiple penetration holes to allow gas and liquid to pass through;

The center support part is arranged in the center of the flexible pouch;

a plurality of edge supports disposed on the inner wall of the flexible nano-sac; and

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

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

a stud, the end of the stud is provided with a rotating head;

a lift sleeve that is clearance fit with the rotating head and whose rotational movement is restricted; and

A push rod, one end of the push rod is hinged on the lifting sleeve, and the other end is hinged on the sliding sleeve,

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

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 cylinder;

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

According to a preferred embodiment of the present invention, the support rod is a rotating rod, and the fluid collection extractor further comprises:

a filter screen disposed in the distal end of the insertion needle; and

a cleaning rod, the cleaning rod is arranged on the end of the rotating rod and abuts on the outer side of the filter screen,

Wherein, 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.

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

The push rod is arranged on the face of the piston facing the second one-way valve, and the face of the push rod away from the piston is an inclined surface;

The U-shaped rod 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;

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

a rack provided on the end of the second rod portion of the U-shaped rod; and

The gear is fixedly arranged on the rotating rod and cooperates with the rack,

Wherein, the inner wall of the cylindrical body has a movable space, and the horizontal rod portion is arranged in the movable space and is allowed to move in the movable space.

According to a preferred embodiment of the present invention, the effusion extractor further includes an elastic expansion and contraction part, the elastic expansion and contraction part is provided between the surface of the wedge-shaped part facing the cylinder body and the inner wall of the cylinder body.

According to a preferred embodiment of the present invention, the effusion extractor further includes a detachable receiving portion, which is provided on the cylindrical wall of the cylindrical body between the second one-way valve and the insertion needle.

The effusion extractor for oncology treatment according to the present invention is provided with two one-way valves, the first one-way valve and the 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 piston and the insertion needle. The one-way valve is located between the first one-way valve and the insertion needle, and the first one-way valve only allows gas to exit the cylinder through the first one-way valve and prohibits gas from entering the cylinder through the first one-way valve, and the second one-way valve The valve only allows gas to enter the space between the piston and the second one-way valve in the barrel through the second one-way valve and prohibits the gas from being exhausted to the insertion needle side through the second one-way valve. With this arrangement, when the piston is pulled by the actuating portion, the left and right sides of the second one-way valve are in gas communication, so that pressure transmission can be achieved, allowing the fluid in the patient to be sucked into the barrel through the insertion needle. The first one-way valve is closed; and when the actuating part pushes the piston, the first one-way valve opens, allowing the gas to be discharged from the cylinder, but at this time the second one-way valve is closed, and the fluid that has been extracted Or the gas will not enter the patient's body. In this way, the effusion extractor can perform multiple extractions with a single introduction of the insertion needle, without the need to replace the needle cannula or to withdraw the needle and re-introduce a new needle. Therefore, it is very practical in the extraction of a large amount of effusion, which can reduce the pain of the patient, improve the extraction efficiency, and reduce the operation burden.

With the effusion extractor for oncology treatment of the present invention, the extracted effusion does not exist in the cylinder, but is introduced into the storage part (eg, storage bag) connected to the cylinder, so the cylinder does not need to have The larger volume can be connected to different volumes according to actual needs, which reduces the volume of the extractor.

In addition, the effusion extractor for oncology treatment of the present invention is designed to have an elastic mesh bag that can change state. Specifically, the elastic mesh bag can be retracted back into the insertion needle, and can also be extended and deployed from the insertion needle, During the process of introducing the insertion needle into the patient, the elastic mesh bag is retracted in the insertion needle. When the insertion needle is in place for fluid extraction, the elastic mesh bag is driven to open by the mechanical linkage structure, and its opening volume is larger than that of the insertion needle. The volume of the needle head, the elastic mesh bag can be used to stretch and push the human tissue at the effusion site, so that the effusion accumulates together, which is convenient for extraction, and because the human tissue is pushed away, it can avoid blocking the insertion needle of the extractor , therefore, the extraction of effusion can be carried out very thoroughly.

Further, the effusion extractor 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. , resulting in the failure of subsequent effusion extraction. A series of components such as piston rod and push rod driven by the actuating part drive the cleaning rod on the filter screen to scrape on the filter screen to scrape off the solids on the filter screen. Each stroke of the piston scrapes the filter screen. This scraping action is performed before each extraction and when the piston returns to the limit position before extraction preparation, which means that the filter screen can be cleaned before each extraction operation of the piston. Therefore, the extraction of the effusion can be carried out smoothly, and the phenomenon of extraction failure can be avoided.

Description of drawings

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;

Figure 2 is an enlarged view of the circular area in Figure 1;

FIG. 3 is an enlarged view of the right area in FIG. 1

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 deployed state;

Figure 5 is an enlarged view of the circular area in Figure 4; and

FIG. 6 is an enlarged view of the right area in FIG. 4 .

Detailed ways

Exemplary embodiments of the present invention are described in detail below with reference to the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements. Furthermore, in the following detailed description, for convenience of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the present disclosure. Obviously, however, one or more embodiments may be practiced without these specific details. In other instances, well-known structures and devices are shown in diagram form in order to simplify the drawings.

According to the general inventive concept of the present invention, there is provided an effusion extractor for oncology treatment, comprising a barrel and an insertion needle connected to a distal end of the barrel, the insertion needle being in fluid communication with the interior of the barrel, so that The effusion extractor is configured to allow the effusion to enter the barrel via the insertion needle while inhibiting the effusion from draining from the barrel via the insertion needle.

FIG. 1 shows an effusion extractor for oncology treatment according to an embodiment of the present invention, which mainly includes a barrel 1 , an insertion needle 5 and a receiving portion 6 . The cylindrical body 1 is substantially cylindrical and has an accommodating space, and the actuating part 2 , the piston rod 3 and the piston 4 are arranged in the cylindrical body 1 . One end of the piston rod 3 is directly or indirectly connected with the actuating part 2 , and the other end of the piston rod 3 is connected with the piston 4 . The actuating part 2 may be a hydraulic cylinder, which drives the piston rod 3 and the piston 4 to move within the cylinder 1 . An insertion needle 5 is attached to the distal end of the barrel 1 (ie the end that is away from the operator when in use), the insertion needle 5 being in fluid communication with the interior of the barrel 1 .

In order for the piston to reciprocate for multiple draws, it is required that the fluid accumulates into the barrel when the piston is pulled back, and the pressure in the barrel is not transmitted to the body or to the insertion needle when the piston is pushed forward. In this way, 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 . Specifically, the effusion extractor is arranged to include: a first one-way valve 13, which is arranged on the barrel wall of the barrel 1 between the piston 4 and the insertion needle 5, and is It is configured to allow gas to be discharged out of the cylinder body 1 through the first one-way valve 13 but prohibit the gas from entering the cylinder body 1 through the first one-way valve 13; between the insertion needle 5 and the first check valve 13 on the side close to the insertion needle 5 , and the second check valve 14 is configured to allow gas to enter the barrel 1 through the second check valve 14 The space between the piston 4 and the second one-way valve 14 prevents the gas from being discharged to the insertion needle 5 side via 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 all between the piston 4 and the insertion needle 5 . The one-way valve for realizing one-way communication belongs to the prior art, and its specific structure will not be described here. When the actuator pulls the piston, the second one-way valve 14 is turned on, 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 fluid; when the actuator pushes the piston , the second one-way valve 14 is closed, neither gas nor liquid can pass through it, 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 performing extraction.

Preferably, the second one-way valve 14 includes a gas-permeable and liquid-impermeable membrane, so that the 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 the liquid Access to the space between the piston 4 and the second one-way valve 14 in the cylinder 1 is prevented via the second one-way valve 14 . In this way, when the second one-way valve 14 is closed (ie 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 (ie when the piston is pulled), only gas can pass through it, but the fluid drawn from the body cannot pass through the second one-way valve 14 into the piston side. With gas passing through, pressure transfer can be achieved, and fluid extraction can be performed. In this way, it is possible to avoid contamination of the piston with fluid accumulation and affect the operation of the piston.

The storage part 6 can be a disposable storage bag, which can be detachably provided on the cylinder wall of the cylinder 1 between the second one-way valve 14 and the insertion needle 5 . The receiving part 6 can be fixed on the wall surface of the cylinder body 1 by screwing or clamping means. The receiving part 6 can have different specifications and different sizes, and is suitable for extracting different types of effusions, and the receiving part 6 is provided with scales. A ruler for calibrating the amount of effusion pumped. The storage part 6 itself has a self-closing valve. When the accumulated fluid is extracted, the storage part 6 is opened, and the accumulated fluid enters the storage part 6 through the insertion needle 5 and the cylindrical body 1; when the piston is reset, the storage part 6 is closed.

A plurality of first one-way valves 13 can be provided around the outer circumference of the cylinder body 1 and are evenly distributed on the outer circumference of the cylinder body 1 to exhaust air evenly.

The elastic mesh bag and its transmission part of the effusion extractor for oncology treatment of the present invention will be introduced below.

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 rigid tube. The stud 19 is a stud with a nut, and the end of the stud 19 is provided with a rotating head 31. The rotating head 31 can be integrated with the stud, or the two are different parts, which are combined by connecting means. Together, for example, the lower side of the stud may be provided with a threaded hole, and the upper surface of the rotating head 31 is provided with a threaded stud portion, which are joined together by the combination of the threaded stud portion and the threaded hole. A screw hole is provided on the wall surface of the cylinder body 1 between the second one-way valve 14 and the insertion needle 5 , and the stud 19 is screwed into the screw hole, as shown in FIG. 2 . In the case where 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 screwing of the stud in the threaded hole on the wall surface of the cylinder body 1; When the two are separated, the nut of the stud 19 and the stud body can be integrated. At this time, the stud 19 is screwed into the screw hole from the outside of the cylinder body 1, and then combined with the rotating head 31 can be combined.

The lifting sleeve 18 is in clearance fit with the rotating head 31, and the rotational movement of the lifting sleeve 18 is restricted. Two limit baffles can be provided on the lower side of the aforementioned screw holes of the cylinder body 1, and the limit baffles extend from the cylinder body The inner wall of 1 extends vertically downward, and the lifting sleeve 18 is located between the two limiting baffles. The outer contour of the lifting sleeve 18 is in the shape of a rectangular parallelepiped, its top surface has an opening and the interior is hollow, and the shape of the rotating head 31 is T-shaped, with a horizontal section and a vertical section, and the shapes of the horizontal section and the vertical section are cylindrical. It's just that the circumferential diameter of the horizontal segment is larger than the circumferential diameter of the vertical segment. 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 substantially T-shaped, with horizontal and vertical sections corresponding to the horizontal and vertical sections of the rotating head 31 . , but the volume of the hollow interior is slightly larger than the volume of the rotating head 31 to allow the rotating head 31 to rotate within the lifting sleeve 18 .

The rotating rod 15 is arranged in the center of the insertion needle 5 and extends from the distal end of the insertion needle 5 into the cylinder body 1. The sliding sleeve 16 is sleeved on the rotating rod 15 and extends in the cylinder body 1 and the insertion needle 5. The sliding sleeve 16 is less than the length of the rotating rod 15 . The sliding sleeve 16 is configured to be relatively slidable along the rotating rod 15 , one end of the rotating rod 15 is supported on the inner wall of the cylinder 1 by means of the 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 realized by relying on the annular part and the support body extending radially outward from the annular part. The end is fixed on the inner wall of the insertion needle 5, and the rotary rod 15 can rotate in the ring of the annular part. Multiple bearing assemblies and ring components can be provided according to actual support requirements.

Preferably, the stud 19 is provided with a lock nut 20, the lock nut 20 is located between the nut of the stud 19 and the outer wall of the cylinder 1, and the lock nut 20 is used to lock the stud 19 to prevent it move. When the effusion extractor of the present invention is not unsealed, the lock nut 20 is locked, and the stud 19 cannot move at this time. When in use, only after the insertion needle 5 is introduced into the target part of the human body, it needs to contact the lock nut 20 After the elastic mesh bag 27 is opened, the lock nut 20 can also be tightened to prevent the stud 19 from moving.

2 and 5 , the effusion extractor further includes a sealing hose 21 , the sealing hose 21 is arranged between the lifting sleeve 18 and the inner wall of the cylinder body 1 for sealing the screw hole of the cylinder body 1 , Prevent fluid leakage.

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 sliding sleeve 16. On the end of the sleeve 16 away from the piston 4, the connecting frame 22 is a hollow disc-shaped frame, which does not prevent the fluid from passing through the insertion needle. The connecting ring 23 is located in the insertion needle 5 and is connected with the outer periphery of the connecting frame 22; rigid The 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 rigid tube 24 opposite to the connecting ring 23 is connected to the elastic mesh bag 27 . The rigid tube 24 can also be replaced by a frame body, as long as the frame body can extend from the connecting ring 23 toward the needle port. If a rigid tube 24 is used, preferably, a plurality of groups are arranged on the wall surface of the rigid tube 24. Through holes to increase the continuity of the effusion.

The elastic mesh bag 27 is arranged on the edge of the rigid 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 with a plurality of penetrating holes to allow gas and liquid to pass through; a central support part 28 arranged in the center of the flexible bag; a plurality of edge supports 30 arranged in the flexible nano bag and a plurality of springs 29, one end of each spring is connected to the central support 28, and the other end is connected to an edge support 30. The central support portion 28 and the edge support portion 30 may be connecting rings or connecting balls.

The transmission of the contraction and expansion of the elastic mesh bag 27 will be introduced below. When the product is not unsealed, the elastic mesh bag 27 is contracted at the end of the insertion needle 5, see Figures 1 and 3 . The function of the elastic mesh bag 27 is to stretch and push the human tissue at the fluid accumulation site during use, so that the fluid accumulates together and facilitates extraction. Therefore, after the insertion needle 5 is introduced into the human body, the elastic mesh bag 27 needs to be stretched. Therefore, the operator unlocks the locking nut 20 and rotates the stud 19. The stud 19 drives the rotating head 31 to rotate, and at the same time the stud 19 Moving down, the upper end of the push rod 17 is driven to move downward, and 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 disk. The mass tube 24 moves to the right, and then the elastic mesh bag 27 protrudes from the needle port of the insertion needle 5; after the elastic mesh bag 27 protrudes from the needle port, it is no longer constrained by the inner wall of the needle port. Under the action of its own spring 29, the flexible bladder is stretched, see FIG. 6 .

A accommodating space for the elastic mesh bag 27 is prefabricated at the needle opening of the insertion needle 5, and the size of the accommodating space is adapted to the size of the elastic mesh bag 27 when it is contracted. The larger the diameter of the space, the more favorable for the outward release and inward retraction of the elastic mesh bag 27, because it can be guided by the outer peripheral surface of the frustum shape. The edge of the needle port of the insertion needle 5 is smooth 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 sleeved with a rubber ring to provide cushioning and support for the flexible pouch. Different parts use flexible capsular bags of different shapes, for example, elongated strips.

In a further preferred embodiment, straps are provided on the inner wall of the rigid tube 24, for example, there are three straps on the circumference of the inner wall, the distal ends of the straps (ie the end away from the rigid tube) are connected On the inner wall of the flexible pouch, preferably, it is connected to the bottom edge of the right 1/3 sphere of the spherical flexible pouch stretched in FIG. 6 , so that when the sliding sleeve 16 is pulled to the left, the rigid The pulling force of the tube 24 acts relatively uniformly on the whole of the flexible pouch, which can smoothly pull the flexible pouch back into the accommodating space at the needle port of the insertion needle.

As described in the background art section, the insertion needle 5 is easily blocked during actual use. For this reason, preferably, a filter mesh 25 is provided at the head of the insertion needle, and the filter mesh 25 is arranged in the distal end of the insertion needle 5 to filter The net 25 is in the shape of a disk, and the center of the disk has a through hole through which the rotating rod 15 passes, and the rotating rod 15 provides a certain support to the filter screen. The filter screen 25 is divided into two separate parts: a disc at the center and a ring on the outer circumference of the disc, the disc is supported by the rotating rod 15, the ring is combined on the inner wall of the insertion needle 5, and the disc and the ring are connected. There is a gap between the gaps for the rigid pipe 24 to pass through.

In an alternative solution, the filter screen 25 is an integral piece of filter screen, which is supported and fixed by the rotating rod 15 and the inner wall of the insertion needle 5. The filter screen 25 is provided with a plurality of circular holes evenly distributed along the circumference. The front end (that is, the end close to the elastic mesh bag 27 ) is provided with a plurality of cylindrical legs, the cylindrical legs extend through the circular hole and can slide in the circular hole, and the front end of the cylindrical leg is connected to the elastic mesh bag 27 . Flexible bladder connection.

In the technical solution of using the filter screen 25, the filter screen is easily blocked by solids in the accumulated liquid, and the present invention provides a technical means for cleaning the filter screen. specifically,

The effusion extractor also includes a cleaning rod 26, which is arranged on the end of the rotating rod 15 and abuts on the outer side of the filter screen 25, and 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 screen 25 .

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 provided in the cylinder body 1, and the push rod 7 is provided on the piston 4 facing the second one-way On the face of the valve 14, the face of the push rod 17 away from the piston 4 is an inclined surface; the U-shaped rod 8 includes: two vertically extending first and second rod parts; and connecting the first and second rod parts The horizontal rod portion of the rod portion; the wedge-shaped portion 8 is provided on the end of the first rod portion of the U-shaped rod 8 and has an inclined inclined surface facing the push rod 7; the rack 10 is provided on the U-shaped rod 8 On the end of the second rod part; and the gear 11, which is fixedly arranged on the rotating rod 15, and cooperates with the rack 10. Wherein, the inner wall of the cylindrical body 1 has a movable space, and the horizontal rod portion is arranged in the movable space and is allowed to move in the movable space. Two sets of slideways extending downward are provided on the inner wall of the cylinder body 1 , each set of slideways accommodates a vertically extending rod portion (the first rod portion or the second rod portion), and the U-shaped rod can be restricted by the slideways 8 can only move up and down in the vertical direction. The active 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. A rod portion and a second rod portion are respectively located on both sides of the second one-way valve 14 . The side of the wedge 8 remote from the push rod 7 is supported on the face of the second one-way valve 14 .

The effusion extractor further includes an elastic expansion and contraction portion 12 , and the elastic expansion and contraction portion 12 is disposed between the surface of the wedge portion 8 facing the cylindrical body 1 and the inner wall of the cylindrical body 1 . The elastic telescopic part 12 can be a spring or an elastic bellows, which provides a vertical downward force for the wedge-shaped part 8, so that in the absence of external force, the wedge-shaped part 8 is located in a low position, and the horizontal rod part is supported on the closing cover.

The working process of the cleaning rod 26 is:

The initial position of the U-shaped rod 9 is: the horizontal rod part is located at the lowermost end and is supported on the closing cover, and the wedge-shaped part 8 is located at the lowermost end; when the piston is pulled backwards, after one suction is completed, it needs to be suctioned again , the piston is pushed forward, and the first one-way valve 13 is exhausted to the outside until the push rod 7 in front of the piston contacts the inclined surface of the wedge portion 8; the further push of the piston causes the wedge portion 8 to drive the U-shaped rod 9 to move upward, thus The rack 10 also moves upward; the movement of the rack 10 makes the gear 11 rotate, thereby driving the rotating rod 15 to rotate, and driving the cleaning rod 26 to rotate, thereby scraping the filter screen 25 .

After the piston reaches the dead center position, the piston retreats, and the wedge-shaped portion 8 moves downward under the action of the elastic telescopic portion 12, which drives the U-shaped rod 9 to move downward, drives the rack 10 to move downward, and causes the gear 11 to rotate in the reverse direction, driving the The rotating rod 15 rotates in the reverse direction, which drives the cleaning rod 26 to rotate in the reverse direction, and scrapes the filter screen 25 again.

Appropriate sealing means need to be considered at the connection between the closure cover and the U-shaped rod 9 and the connection between the U-shaped rod and the groove. A feasible way is to use an elastic bellows at the first rod portion, and use an elastic bellows at the second rod portion. A common corrugated pipe is used, one end of the corrugated pipe is connected to the inner wall of the cylinder body 1, and the other end is connected to the rod body of the second rod part.

The effusion extractor for oncology treatment according to the present invention is provided with two one-way valves, the first one-way valve and the 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 piston and the insertion needle. The one-way valve is located between the first one-way valve and the insertion needle, and the first one-way valve only allows gas to exit the cylinder through the first one-way valve and prohibits gas from entering the cylinder through the first one-way valve, and the second one-way valve The valve only allows gas to enter the space between the piston and the second one-way valve in the barrel through the second one-way valve and prohibits the gas from being exhausted to the insertion needle side through the second one-way valve. With this arrangement, when the piston is pulled by the actuating portion, the left and right sides of the second one-way valve are in gas communication, so that pressure transmission can be achieved, allowing the fluid in the patient to be sucked into the barrel through the insertion needle. The first one-way valve is closed; and when the actuating part pushes the piston, the first one-way valve opens, allowing the gas to be discharged from the cylinder, but at this time the second one-way valve is closed, and the fluid that has been extracted Or the gas will not enter the patient's body. In this way, the effusion extractor can perform multiple extractions with a single introduction of the insertion needle, without the need to replace the needle cannula or to withdraw the needle and re-introduce a new needle. Therefore, it is very practical in the extraction of a large amount of effusion, which can reduce the pain of the patient, improve the extraction efficiency, and reduce the operation burden.

With the effusion extractor for oncology treatment of the present invention, the extracted effusion does not exist in the cylinder, but is introduced into the storage part (eg, storage bag) connected to the cylinder, so the cylinder does not need to have The larger volume can be connected to different volumes according to actual needs, which reduces the volume of the extractor.

In addition, the effusion extractor for oncology treatment of the present invention is designed to have an elastic mesh bag that can change state. Specifically, the elastic mesh bag can be retracted back into the insertion needle, and can also be extended and deployed from the insertion needle, During the process of introducing the insertion needle into the patient, the elastic mesh bag is retracted in the insertion needle. When the insertion needle is in place for fluid extraction, the elastic mesh bag is driven to open by the mechanical linkage structure, and its opening volume is larger than that of the insertion needle. The volume of the needle head, the elastic mesh bag can be used to stretch and push the human tissue at the effusion site, so that the effusion accumulates together, which is convenient for extraction, and because the human tissue is pushed away, it can avoid blocking the insertion needle of the extractor , therefore, the extraction of effusion can be carried out very thoroughly.

Further, the effusion extractor 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. , resulting in the failure of subsequent effusion extraction. A series of components such as piston rod and push rod driven by the actuating part drive the cleaning rod on the filter screen to scrape on the filter screen to scrape off the solids on the filter screen. Each stroke of the piston scrapes the filter screen. This scraping action is performed before each extraction and when the piston returns to the limit position before extraction preparation, which means that the filter screen can be cleaned before each extraction operation of the piston. Therefore, the extraction of the effusion can be carried out smoothly, and the phenomenon of extraction failure can be avoided.

Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill 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 applicability of the present invention is defined by the appended claims and their equivalents.

List of reference numbers:

1 barrel

2 Actuator

3 Piston rod

4 pistons

5 Insert the needle

6 Storage Department

7 push lever

8 wedges

9 U-bar

10 rack

11 gear

12 Elastic expansion part

13 First check valve

14 Second check valve

15 Rod

16 sliding sleeve

17 putter

18 lift sets

19 Studs

20 Lock Nut

21 Seal hose

22 Connection frame

23 connecting ring

24 Hard Tube

25 Filter

26 Cleaning rod

27 Elastic mesh pouch

28 Center support

29 Spring

30 Edge support

31 Rotate the head.

Claims (10)

1. An effusion extractor for oncology treatment, comprising a barrel (1) and an insertion needle (5) connected on the distal end of the barrel (1), the insertion needle (5) being in fluid communication with the interior of the barrel (1), characterized in that:

the effusion extractor is configured to allow effusion to enter the barrel (1) via the insertion needle (5) while prohibiting effusion to be discharged from the barrel (1) via the insertion needle (5).

2. The dropsy extractor for oncology therapy of claim 1, further comprising:

the piston (4), the said piston (4) is set up in the cylinder (1);

a first one-way valve (13), the first one-way valve (13) being disposed on a barrel wall of the barrel (1) between the piston (4) and the insertion needle (5) and being configured to allow gas to exit the barrel (1) via the first one-way valve (13) but to inhibit gas from entering the barrel (1) via the first one-way valve (13); and

a second check valve (14) provided in the cylinder (1) between the piston (4) and the insertion needle (5) and on a side of the first check valve (13) close to the insertion needle (5), and the second check valve (14) is configured to allow gas to enter a space in the cylinder (1) between the piston (4) and the second check valve (14) via the second check valve (14) but prohibit gas from being discharged to the insertion needle (5) side via the second check valve (14).

3. The dropsy extractor for oncology therapy according to claim 2, wherein:

the effusion extractor further comprises an actuating part (2) and a piston rod (3), wherein the actuating part (2) is directly or indirectly connected with the piston rod (3) and is used for driving the piston rod (3) to move longitudinally; the piston rod (3) is located within the cylinder (1), and the piston (4) is arranged on an end of the piston rod (3) remote from the actuation portion (2).

4. The dropsy extractor for oncology therapy according to claim 3, wherein:

the second one-way valve (14) comprises a gas-permeable, liquid-impermeable membrane, such that gas can enter the space between the piston (4) and the second one-way valve (14) in the cylinder (1) via 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) via the second one-way valve (14).

5. The dropsy extractor for oncology therapy of claim 4, further comprising:

the supporting rod is arranged in the center of the insertion needle (5) and extends into the barrel body (1) from the far end of the insertion needle (5);

a sliding sleeve (16), wherein the sliding sleeve (16) is sleeved on the supporting rod and extends in the barrel body (1) and the insertion needle (5), and the sliding sleeve (16) is configured to slide along the supporting 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 contraction state and a second expansion state.

6. The dropsy extractor for oncology therapy of claim 5, further comprising:

the connecting frame (22) is positioned in the insertion needle (5) and fixedly arranged on the end part of the sliding sleeve (16) far away from the piston (4);

a connection ring (23) which is positioned in the insertion needle (5) and is connected with the connection frame (22); and

a hard tube (24), wherein the hard tube (24) is connected with the connecting ring (23), extends from the connecting ring (23) to the far end of the insertion needle (5), and one end of the hard tube (24) opposite to the connecting ring (23) is connected with the elastic net sac (27).

7. The effusion extractor for oncological treatment according to claim 6, characterized in that the elastic mesh capsule (27) comprises:

a flexible pouch having a plurality of penetration holes to allow gas and liquid to pass through;

a center support (28) disposed at the center of the flexible pouch;

a plurality of edge supports (30) disposed on an inner wall of the flexible nanocapsule; and

a plurality of springs (29), each spring having one end attached to the central support (28) and the other end attached to one of the edge supports (30).

8. The dropsy extractor for oncology therapy of claim 7, further comprising:

a stud (19), a rotating head (31) being provided on an end of the stud (19);

a lifting sleeve (18), the lifting sleeve (18) being clearance fitted with a rotating head (31) and the rotational movement of the lifting sleeve (18) being limited; and

a push rod (17), one end of the push rod (17) is hinged on the lifting sleeve (18), the other end is hinged on the sliding sleeve (16),

the wall surface of the barrel body (1) between the second one-way valve (14) and the insertion needle (5) is provided with a screw hole, and the stud (19) is screwed in the screw hole.

9. The dropsy extractor for oncology therapy according to claim 8, wherein:

the stud (19) is provided with a locking nut (20), and the locking nut (20) is positioned between the nut of the stud (19) and the outer wall of the cylinder body (1);

rotatory head (31) are the T font, lift cover (18) are around the periphery of rotatory head (31), and hydrops extractor still includes sealing hose (21), sealing hose (21) set up between the inner wall of lift cover (18) and barrel (1).

10. An effusion extractor for oncology therapy according to claims 2-9, characterized in that:

hydrops extractor still includes receiving portion (6) that can dismantle, sets up on being located second check valve (14) of barrel (1) and inserting the barrel wall between needle (5).

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