Suction and drainage device capable of manually adjusting negative pressure

Abstract

The invention relates to a suction and drainage device capable of manually adjusting negative pressure. The suction and drainage device comprises an auxiliary cover, a drainage connector with a two-way valve, a locking hand wheel, an injector arranged in the auxiliary cover and a three-way unit. The auxiliary cover comprises a fixed cylinder and a movable cylinder which are slidably arranged, one end of the fixed cylinder communicates with a drainage connector, and the other end of the fixed cylinder is rotationally connected with a locking hand wheel; the locking hand wheel penetrates through the side wall of the fixed cylinder and abuts against the movable cylinder. The injector comprises a needle cylinder and a piston rod, the needle cylinder is fixed in the fixed cylinder, the piston rod is slidably connected in the needle cylinder, and the piston rod is hollow; the three-way unit comprises a three-way connector and a piston cap, a right port of the three-way connector is communicated with the piston rod, the piston cap is elastically and slidably connected between the right port and the left port of the three-way connector, and the piston cap opens and closes the lower port of the three-way connector in a reciprocating mode. The negative pressure drainage device is convenient to operate and carry, can be conveniently fixed on the body of a patient, can accurately control the negative pressure, and can realize drainage of drainage liquid without repeatedly disconnecting and connecting the drainage tube.

Description

Technical Field

[0001] The invention relates to the technical field of medical suction instruments, and in particular to a suction and drainage device with manually adjustable negative pressure. Background Art

[0002] At present, drainage tubes are often required after clinical surgical operations for negative pressure drainage or subcutaneous drainage. Drainage tubes are generally placed in the body cavity. The drainage tubes cooperate with the drain device to drain exudate, blood, body fluids and other fluids from the surgical site to promote healing of the surgical site.

[0003] Some clinical surgeons often make their own small negative pressure drainage devices, which are syringes. The specific operation is as follows: after the drainage tube is buried in the surgical site, one end of the drainage tube is connected to the syringe nipple, the drainage tube is clamped, and the piston is pulled outward with force, and then the needle cap of the syringe is stuck between the piston handle and the barrel wing of the syringe to prevent the piston from retreating. Figure 1 As shown. In this way, negative pressure will be formed inside the syringe, and after the drainage tube is no longer clamped, once there is exudate from the surgical site, it will flow into the syringe along the drainage tube under the action of negative pressure, thereby achieving drainage.

[0004] After the syringe is filled with drainage fluid, it is difficult to use it again. This requires disconnecting the syringe from the drainage tube, pushing the piston inward to discharge the drainage fluid, and then reconnecting it to the drainage tube. It can be seen from this that although the homemade drainage device is simple, it is troublesome to operate: repeatedly disconnecting the syringe from the drainage tube is prone to cross infection; and the needle cap needs to be frequently disassembled and assembled. The needle cap is simply stuck between the piston handle and the barrel wing and is easy to loosen and fall off, and the stability of controlling the negative pressure is poor. Once the negative pressure leaks, negative pressure drainage can no longer be achieved; it is difficult to accurately adjust and control and judge the size of the negative pressure in the syringe. Summary of the invention

[0005] In order to solve the problems that homemade drainage devices are cumbersome to operate and the size of negative pressure is difficult to accurately judge and adjust, the present invention provides a suction drainage device with manually adjustable negative pressure. The drainage fluid can be introduced and discharged by simply pushing the syringe inward and pulling the syringe outward, without disconnecting the drainage tube. At the same time, certain measures are taken to monitor the size of the negative pressure in the syringe.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is: A suction drainage device with manually adjustable negative pressure, used to cooperate with a drainage tube to drain exudate from a surgical site, comprising an auxiliary cover, a drainage joint with a two-way valve, a locking hand wheel, a syringe installed in the auxiliary cover, and a three-way unit with both drainage fluid discharge and negative pressure monitoring functions; The auxiliary cover comprises a fixed cylinder and a movable cylinder which are relatively slidably arranged, so as to facilitate adjustment of the length of the auxiliary cover and thus control the pulling and drawing of the syringe; one end of the fixed cylinder is connected with the drainage joint for connecting the drainage tube, and the two-way valve is convenient for controlling the on-off of the drainage joint; both sides of the other end of the fixed cylinder are rotatably connected with the locking handwheel, and the locking handwheel is an eccentric wheel structure, which is convenient for squeezing the movable cylinder to fix it; the movable cylinder is sleeved in the fixed cylinder, and a liquid level indicator line is arranged on the outer wall of the movable cylinder, which is convenient for counting the amount of drainage liquid and observing the extended length of the movable cylinder; the locking handwheel passes through the side wall of the fixed cylinder and is tightly against the movable cylinder, so as to facilitate fixing the movable cylinder; The syringe comprises a syringe and a piston rod with a piston and a piston handle arranged at both ends, the syringe is fixed in a fixed cylinder, the movable cylinder is slidably sleeved outside the syringe, the piston rod is slidably connected in the syringe, the piston rod is hollow inside, the piston rod, the syringe and the drainage joint are connected in sequence, and the drainage fluid in the syringe will enter the piston rod; The three-way unit includes a transparent three-way joint and a piston cap. A negative pressure indicator line is provided on the outer wall of the three-way joint. The right port of the three-way joint is connected with the piston rod through the movable cylinder. The right port of the three-way joint and the piston rod cooperate to clamp the movable cylinder, so that the movable cylinder drives the piston rod to move together. The piston cap is elastically slidably connected between the right port and the left port of the three-way joint. The piston cap reciprocates to open and close the lower port of the three-way joint, so as to facilitate the closing and opening of the lower port.

[0007] Furthermore, the fixed cylinder and the movable cylinder are both cylindrical bodies with one end open, the open ends of the fixed cylinder and the movable cylinder are arranged opposite to each other, the movable cylinder is slidably connected inside the fixed cylinder, and the inner wall of the fixed cylinder and the outer wall of the movable cylinder are in contact with each other; The fixing tube is also provided with fixing rings at both ends, and ribs are provided between the fixing rings at both ends, the ribs extend along the axial direction of the fixing tube, and the ribs are connected and fixed to the outer wall of the fixing tube. The combination of the fixing rings and the ribs improves the structural strength of the fixing tube itself.

[0008] Furthermore, the drainage joint is arranged at the closed end of the fixed cylinder, the two-way valve is arranged at one end of the drainage joint, and the other end of the drainage joint is in a tapered tubular shape, which is convenient for adapting to drainage tubes of different sizes.

[0009] Furthermore, the locking handwheels are arranged on both sides of the open end of the fixed cylinder, and the number of locking handwheels on each side is two. The two locking handwheels are arranged on both sides of the rib, and the locking handwheel and the rib are rotatably connected, and the locking handwheel is convenient for fixing the piston rod; The locking handwheel is provided with a toggle block, which is arranged along the tangent of the locking handwheel and protrudes from the circumferential surface of the locking handwheel, so as to facilitate the control of the rotation of the locking handwheel.

[0010] Furthermore, one end of the syringe is detachably arranged in the fixed cylinder, which facilitates the disassembly and assembly of the syringe. One end of the syringe is provided with a nipple, and the syringe is connected to the drainage joint through the nipple. The length of the syringe is shorter than the length of the fixed cylinder. There is a gap between the outer wall of the syringe and the inner wall of the fixed cylinder to accommodate a movable cylinder. The movable cylinder is arranged between the outer wall of the syringe and the inner wall of the fixed cylinder, and one end of the movable cylinder extends out of the fixed cylinder.

[0011] Furthermore, the piston rod includes a tubular hollow rod and a plurality of ribs circumferentially arranged around the hollow rod, the hollow rod passes through the piston handle and the piston, the two ends of each rib are respectively against the piston handle and the piston, and the outer wall of the piston is tightly fitted with the inner wall of the syringe.

[0012] Furthermore, after the piston handle extends out of the syringe, it abuts against the closed end of the movable cylinder, and the three-way unit is arranged at the closed end of the movable cylinder. The right port of the three-way joint passes through the closed end of the movable cylinder and extends into the piston rod, and is threadedly connected and fixed with the piston rod. This can not only realize the installation of the three-way unit, but also connect the piston cylinder and the piston rod, so that they can be moved together conveniently.

[0013] Furthermore, the right port of the three-way joint is in the shape of a stepped tube, and a hollow cover plate is embedded in the left port of the three-way joint, which does not affect the air entering and exiting the three-way joint. The piston cap is slidably connected between the left port and the right port of the three-way joint, and the sliding path of the piston cap passes through the lower port of the three-way joint. The outer wall of the piston cap fits tightly with the inner wall of the three-way joint. A compression spring is arranged between one end face of the piston cap and the right port of the three-way joint, and the compression spring drives the piston cap to close the lower port of the three-way joint.

[0014] Through the above technical solution, the beneficial effects of the present invention are: The structural design of the present invention is reasonable. A syringe is installed in an auxiliary cover with adjustable length, which can provide certain protection for the syringe. At the same time, since the auxiliary cover includes a fixed cylinder and a movable cylinder that are slidably connected, it is convenient to control the withdrawal and pulling of the syringe. That is, the withdrawal and pulling of the syringe can be adjusted by sliding the fixed cylinder and the movable cylinder. By withdrawing and pulling the syringe in combination with certain conditions, negative pressure can be generated, which is convenient for the drainage of exudate.

[0015] The fixed cylinder and the movable cylinder of the present invention are controlled by a locking hand wheel in the form of an eccentric wheel. The locking hand wheel can be rotated forward and backward to cause the locking hand wheel to squeeze or not squeeze the movable cylinder, so that the movable cylinder can be locked and unlocked conveniently, and the sliding of the movable cylinder can be adjusted steplessly. The syringe in the syringe is threadedly connected and fixed to the fixed cylinder, so that the syringe can be kept stationary, the piston rod in the syringe can slide, and under the action of the three-way unit, the piston handle and the closed end of the movable cylinder are connected, so that the movable cylinder can move together with the piston part in the syringe.

[0016] The piston rod of the present invention is hollow inside, and the drainage fluid in the syringe can enter the piston rod and flow out through the three-way unit. The three-way unit not only has the function of drainage fluid outflow, but also can judge the negative pressure according to the sliding position of the piston cap inside it and the negative pressure scale. That is, when the syringe is pulled outward, the piston cap is close to the right port of the three-way connector under the action of negative pressure, and the negative pressure can be accurately adjusted according to the different positions of the piston cap on the negative pressure scale.

[0017] When the present invention forms negative pressure: the two-way valve is closed and the movable cylinder is pulled outward to drive the piston rod to move out, and negative pressure is formed in the syringe. At the same time, the piston cap moves to compress the compression spring to cause it to be compressed. After a certain negative pressure is formed, the locking hand wheel can be rotated to squeeze the movable cylinder so that the piston rod remains fixed, thereby forming a stable negative pressure in the syringe. After the two-way valve is opened and the drainage tube is connected, the exudate at the surgical site can be sucked.

[0018] After the syringe and piston rod of the present invention are filled with drainage fluid, the two-way valve is closed, the movable cylinder is unlocked, and the movable cylinder is pushed inward to cause the drainage fluid to enter the piston rod through the piston and be discharged through the three-way joint, so there is no need to repeatedly disconnect and reconnect the drainage tube. Only by simply pulling out the syringe and coordinating the opening and closing of the two-way valve, negative pressure suction can be performed uninterruptedly, which is convenient for promoting the healing of the surgical site. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the conventional state of using a needle cap to prevent the piston from retreating.

[0020] Figure 2 It is a top view of the suction and drainage device with manually adjustable negative pressure of the present invention.

[0021] Figure 3 It is a front view of the suction and drainage device with manually adjustable negative pressure of the present invention.

[0022] Figure 4 The invention is a suction and drainage device for manually adjusting negative pressure. Figure 3 sectional view of .

[0023] Figure 5 The invention is a suction and drainage device for manually adjusting negative pressure. Figure 4 Disconnection diagram.

[0024] Figure 6 It is a schematic diagram of the syringe pulling state of the suction drainage device with manually adjusted negative pressure of the present invention, and the syringe contains drainage fluid.

[0025] Figure 7 This is one of the schematic diagrams of the disassembly of parts of the suction and drainage device with manually adjusted negative pressure of the present invention.

[0026] Figure 8 This is the second schematic diagram of the disassembled parts of the suction and drainage device with manually adjustable negative pressure of the present invention.

[0027] Fig. 9 It is a schematic diagram of the arrangement of the sterilization unit of the suction and drainage device with manually adjustable negative pressure of the present invention.

[0028] The numbers in the accompanying drawings are: 1 piston handle, 2 syringe, 3 cylinder wing, 4 nipple, 5 needle cap, 6 auxiliary cover, 61 fixed cylinder, 62 movable cylinder, 7 two-way valve, 8 drainage joint, 9 locking handwheel, 11 three-way unit, 111 three-way joint, 112 piston cap, 12 liquid level indicator line, 13 fixing ring, 14 ribs, 15 holes, 16 toggle block, 17 piston, 18 piston rod, 181 hollow rod, 182 rib plate, 19 connecting section, 20 cover plate, 21 negative pressure indicator line, 22 right port, 23 left port, 24 lower port, 25 compression spring, 26 lithium battery, 27 ultraviolet light strip, 28 push button switch, 29 elastic clip, 30 power cord, 31 plug. DETAILED DESCRIPTION

[0029] The specific implementation of the present invention is described in detail below with reference to the accompanying drawings: like Figure 2~Figure 9 As shown, the suction and drainage device with manually adjustable negative pressure is used to cooperate with the drainage tube to drain the exudate from the surgical site, and the suction and drainage device can be fixed on the surface of the corresponding part of the patient's body by medical tape, which is convenient for the patient to carry and use. The suction and drainage device includes an auxiliary cover 6, a drainage joint 8 with a two-way valve 7, a locking hand wheel 9, a syringe installed in the auxiliary cover 6, and a three-way unit 11 with both drainage fluid discharge and negative pressure monitoring functions.

[0030] The auxiliary cover 6 is equivalent to a shell, in which the syringe can be loaded. Here, the auxiliary cover 6 includes a fixed cylinder 61 and a movable cylinder 62 that are relatively slidably arranged. The fixed cylinder 61 and the movable cylinder 62 are both cylindrical bodies made of medical plastics with one end open. The open ends of the fixed cylinder 61 and the movable cylinder 62 are arranged relatively, the diameter of the fixed cylinder 61 is larger than that of the movable cylinder 62, and the movable cylinder 62 is sleeved in the fixed cylinder 61, and then the movable cylinder 62 is slidably connected in the fixed cylinder 61, the inner wall of the fixed cylinder 61 and the outer wall of the movable cylinder 62 are fitted, and one end of the movable cylinder 62 extends out of the fixed cylinder 61. A liquid level indicator line 12 is arranged on the outer wall of the movable cylinder 62, and the sliding extension distance of the movable cylinder 62 can be judged according to the liquid level indicator line 12.

[0031] In order to increase the structural strength of the fixed tube 61, fixed rings 13 are provided at both ends of the fixed tube 61, and ribs 14 are provided between the fixed rings 13 at both ends. The ribs 14 extend axially along the fixed tube 61, and the ends of the ribs 14 are connected and fixed to the fixed rings 13, and the ribs 14 are connected and fixed to the outer wall of the fixed tube 61. Thus, the fixed rings 13 and the ribs 14 are added to the fixed tube 61, and the fixed rings 13 and the ribs 14 form a frame, which is equivalent to covering the fixed tube 61 inside, thereby improving the pressure resistance of the fixed tube 61.

[0032] One end of the fixed cylinder 61 is connected to a drainage connector 8 for connecting a drainage tube. Specifically, the drainage connector 8 is arranged at the closed end of the fixed cylinder 61, and a two-way valve 7 is arranged at one end of the drainage connector 8. The two-way valve 7 can control the on-off of the drainage connector 8. The other end of the drainage connector 8 is in a tapered tubular shape, and can be adapted to drainage tubes of different sizes, making it convenient for the drainage tube to be plugged and connected with the tapered end of the drainage connector 8.

[0033] Since the fixed cylinder 61 and the movable cylinder 62 can slide relative to each other, on the basis of the fixed cylinder 61 being fixed in position, in order to realize the sliding control of the movable cylinder 62, locking hand wheels 9 are rotatably connected on both sides of the other end of the fixed cylinder 61, that is, locking hand wheels 9 are arranged on both sides of the open end of the fixed cylinder 61, and there are two locking hand wheels 9 on each side, and the locking hand wheels 9 are eccentric wheel structures.

[0034] When the locking handwheel 9 is installed, the two locking handwheels 9 are arranged on both sides of the rib 14, and the locking handwheel 9 and the rib 14 are rotatably connected. A pin is used here, and the pin is passed between the rib 14 and the two locking handwheels 9. The middle part of the pin is a cylinder and can be rotatably connected to the rib plate. The two ends of the pin are quadrangular prisms, which are respectively plugged into the two locking handwheels 9, and the end of the pin and the locking handwheel 9 are interference fit, thereby realizing the connection and fixation of the locking handwheel 9 and the pin. In this way, the two locking handwheels 9 on one pin can rotate synchronously.

[0035] After installation, the locking handwheel 9 passes through the side wall of the fixed cylinder 61 and is tightly against the movable cylinder 62, that is, a hole 15 is opened on the side wall of the fixed cylinder 61, and the hole 15 corresponds to the locking handwheel 9 and can accommodate the locking handwheel 9 to pass through, so that the locking handwheel 9 can contact the movable cylinder 62 downward through the hole 15. Since the locking handwheel 9 is an eccentric wheel structure, the locking handwheel 9 can contact or not contact the movable cylinder 62 during the rotation process. When the locking handwheel 9 contacts the movable cylinder 62, it squeezes it and fixes the movable cylinder 62, and the movable cylinder 62 no longer moves.

[0036] The rotation of the locking handwheel 9 is manually operated. In order to facilitate the manual rotation of the locking handwheel 9, a toggle block 16 is provided on the locking handwheel 9. The toggle block 16 is arranged along the tangent of the locking handwheel 9. The toggle block 16 protrudes from the circumferential surface of the locking handwheel 9, and then the forward and reverse rotation of the locking handwheel 9 is controlled by the toggle block 16 to achieve locking or unlocking of the movable cylinder 62, which facilitates the sliding adjustment of the movable cylinder 62.

[0037] In this embodiment, the syringe includes a syringe 2 and a piston rod 18 with a piston 17 and a piston handle 1 arranged at both ends, respectively. The piston 17, the piston handle 1 and the piston rod 18 move together. The syringe 2 is fixed in the fixed cylinder 61. The length of the syringe 2 is less than the length of the fixed cylinder 61. There is a gap between the outer wall of the syringe 2 and the inner wall of the fixed cylinder 61. The gap is the space reserved for the movable cylinder 62, that is, the movable cylinder 62 is arranged between the outer wall of the syringe 2 and the inner wall of the fixed cylinder 61. The movable cylinder 62 can slide relative to the syringe 2 and the fixed cylinder 61, and then the movable cylinder 62 is slidably sleeved outside the syringe 2.

[0038] When the syringe 2 is installed, one end of the syringe 2 can be detachably arranged in the fixed cylinder 61, so that the syringe 2 can be disassembled. Here, one end of the syringe 2 expands outward to form a connecting section 19, the diameter of the connecting section 19 is larger than the diameter of the syringe 2, and the connecting section 19 has an external thread, so that the connecting section 19 can be threadedly connected with the inner wall of the fixed cylinder 61, so as to achieve the installation of the syringe 2 and the fixed cylinder 61. After installation, the position of the syringe 2 is fixed and will not move axially with the fixed cylinder 61. There is a nipple 4 at one end of the syringe 2, and the syringe 2 is connected to the drainage joint 8 through the nipple 4, so that the liquid in the drainage joint 8 can enter the syringe 2 through the nipple 4. The liquid level indicator line 12 can also indicate the size of the space in the syringe 2 for liquid storage.

[0039] The syringe 2 is slidably connected with a piston rod 18, which is longer than the syringe 2. The outer wall of the piston 17 at one end of the piston rod 18 fits tightly with the inner wall of the syringe 2. The piston handle 1 at the other end of the piston rod 18 extends out of the syringe 2 and abuts against the closed end of the movable cylinder 62. It should be noted that the piston rod 18 is hollow inside, and then the piston rod 18, the syringe 2 and the drainage joint 8 are connected in sequence, and the liquid in the syringe 2 can enter the piston rod 18.

[0040] Specifically, the piston rod 18 includes a hollow rod 181 and three ribs 182 circumferentially arranged around the hollow rod 181. The hollow rod 181 passes through the piston handle 1 and the piston 17, and the hollow rod 181 corresponds to the drainage joint 8. The ribs 182 are arranged at equal intervals, and both ends of each rib 182 are respectively against the piston handle 1 and the piston 17, and one end of the rib 182 is connected and fixed to the piston handle 1, thereby increasing the strength of the entire piston rod 18 structure.

[0041] In this embodiment, the three-way unit 11 is arranged at the closed end of the movable cylinder 62 and is connected to the piston rod 18. The three-way unit 11 can not only display the magnitude of the negative pressure, but also facilitate the outflow of the liquid in the syringe 2. The three-way unit 11 includes a three-way connector 111 and a piston cap 112. The three-way connector 111 is a transparent tube made of medical plastic.

[0042] When the three-way joint 111 is installed, the right port 22 of the three-way joint 111 is in a stepped tube shape, and the right port 22 of the three-way joint 111 passes through the movable cylinder 62 to communicate with the piston rod 18. Specifically, the right port 22 of the three-way joint 111 passes through the closed end of the movable cylinder 62 and then extends into the piston rod 18 and is threadedly connected and fixed with the piston rod 18. After tightening the three-way joint 111, the right port 22 of the three-way joint 111 and the piston rod 18 cooperate to clamp the movable cylinder 62, and then the three-way unit 11 and the piston rod 18 can be driven to move together by sliding the movable cylinder 62.

[0043] A hollow cover plate 20 is embedded in the left port 23 of the three-way joint 111, and the cover plate 20 can be removed, and the cover plate 20 does not affect the air entering and exiting the three-way joint 111. A piston cap 112 is elastically slidably connected between the right port 22 and the left port 23 of the three-way joint 111, that is, the piston cap 112 is slidably connected between the left port 23 and the right port 22 of the three-way joint 111, and the outer wall of the piston cap 112 is tightly fitted with the inner wall of the three-way joint 111. The sliding path of the piston cap 112 passes through the lower port 24 of the three-way joint 111, and then the piston cap 112 corresponds to or does not correspond to the lower port 24 of the three-way joint 111. When corresponding, the lower port 24 is closed, and when not corresponding, the lower port 24 is opened. In this way, the piston cap 112 can reciprocate to open and close the lower port 24 of the three-way joint 111.

[0044] The sliding of the piston cap 112 is controlled by negative pressure. A negative pressure indicator line 21 is provided on the outer wall of the three-way joint 111. During the sliding process of the piston cap 112, the negative pressure size can be determined according to the different positions of the piston cap 112 on the negative pressure indicator line 21.

[0045] In order to realize the reset of the piston cap 112, the piston cap 112 is a cylinder with a "convex" cross section, and a compression spring 25 is arranged between one end of the piston cap 112 with a small diameter and the right port 22 of the three-way joint 111. The two ends of the compression spring 25 are respectively fixed to corresponding parts, and then the compression spring 25 can drive the piston cap 112 to close the lower port 24 of the three-way joint 111. This is the initial position of the piston cap 112, and the piston cap 112 corresponds to the lower port 24 at this time. The greater the compression degree of the compression spring 25, the stronger the negative pressure attraction of the piston cap 112, which means the greater the negative pressure.

[0046] The principle of the present invention is: on the basis of a drainage tube buried in the surgical site, the drainage connector 8 is plugged and connected with one end of the drainage tube. Since the drainage connector 8 is a tapered tube, the drainage connector 8 can be connected to drainage tubes of different sizes. After the connection, the two-way valve 7 is closed and the movable cylinder 62 is unlocked by the locking hand wheel 9, and then the movable cylinder 62 is manually pulled outward, and then the piston rod 18 gradually moves out of the syringe 2, and negative pressure is formed inside the syringe 2. During the pulling process, the piston cap 112 is gradually close to the piston rod 18 and the compression spring 25 is compressed due to the negative pressure. The size of the negative pressure can be judged according to the indication of the negative pressure scale line, and the moving distance of the movable cylinder 62 and the amount of negative pressure space in the syringe 2 can be judged according to the indication of the liquid scale line.

[0047] After the movable cylinder 62 moves a certain distance away from the fixed cylinder 61, the locking hand wheel 9 is turned to deflect it, and then the locking hand wheel 9 is used to squeeze the movable cylinder 62 to fix the movable cylinder 62, and then the piston rod 18 is also fixed, so that a stable negative pressure can be formed in the syringe 2. Open the two-way valve 7, and once there is exuded liquid at the surgical site, the exuded liquid can be sucked into the syringe 2 and the inside of the piston rod 18 under the action of negative pressure.

[0048] When the syringe is filled with drainage fluid, close the two-way valve 7, rotate the locking handwheel 9 in the opposite direction to unlock the movable cylinder 62, push the movable cylinder 62 inward manually to drive the piston rod 18 to move in, use the piston rod 18 to squeeze the drainage fluid, and cause the drainage fluid to enter the three-way joint 111 through the piston rod 18, and then the piston cap 112 moves away from the piston rod 18, and the compression spring 25 gradually extends until the piston cap 112 does not correspond to the lower port 24 of the three-way joint 111, and then the lower port 24 opens, and the drainage fluid flows out of the syringe through the lower port 24.

[0049] After the drainage fluid in the syringe 2 flows out, the movable cylinder 62 is pulled outward again to drive the piston rod 18 to move outward. At this time, the compression spring 25 continues to be compressed, and the negative pressure gradually increases. After the piston rod 18 moves out a certain distance, the locking hand wheel 9 is turned to fix the piston rod 18, and the two-way valve 7 is opened to continue to attract the exudate. In this way, the exudate from the surgical site can be drained, and the recovery and healing of the surgical site can be promoted.

[0050] The operation of the present invention is convenient and it is easy to carry. It can be conveniently fixed on the patient without affecting the patient's activities. For this purpose, a medical double-sided adhesive is provided outside the fixing cylinder 61. The medical double-sided adhesive can be a sticky dressing. The entire drainage device can be fixed on the body surface by using the medical double-sided adhesive. Specifically, it can be bonded to the patient's clothing or the skin near the wound. During the pulling process of the syringe, the magnitude of the negative pressure can be accurately controlled through the indication of the piston cap 112. Under the locking of the locking handwheel 9, the stability of the negative pressure is ensured. At the same time, the three-way joint 111 also has the function of draining the drainage fluid, so there is no need to repeatedly disconnect and connect the drainage tube, reducing the tediousness of the surgeon's work, saving time and improving efficiency.

[0051] To optimize the product structure and achieve disinfection and sterilization of the drainage fluid, sterilization units are arranged between two adjacent rib plates 182. The number of sterilization units is three, and each sterilization unit can be independently controlled, as Fig. 9 shown. The sterilization unit includes a lithium battery 26, an ultraviolet lamp strip 27, and a key switch 28. The lithium battery 26 is a 5V lithium battery 26 with a built-in plug 31. When the lithium battery 26 is installed, an elastic clip 29 with a "U" - shaped cross - section is arranged on the piston 17. The lithium battery 26 is inserted into the elastic clip 29, and the lithium battery 26 can be fixed by clamping it with the elastic clip 29.

[0052] The ultraviolet lamp strip 27 is axially arranged along the outer wall of the hollow rod 181. The ultraviolet lamp strip 27 irradiates the drainage fluid inside the hollow rod 181. The ultraviolet lamp strip 27 is fixed by an adhesive bonding method, and the input voltage of the ultraviolet lamp strip 27 is 5V. The ultraviolet lamp strip 27 is self - equipped with a power cord 30 with a plug 31 at the end. Thus, the ultraviolet lamp strip 27 can be connected to the plug 31 of the lithium battery 26, facilitating the connection and disconnection of the power supply. After disconnection, the lithium battery 26 can be taken out for charging.

[0053] Since the entire sterilization unit is integrated inside the syringe, to facilitate the control of the start and stop of the ultraviolet lamp strip 27, a key switch 28 is arranged on the power cord 30. The key switch 28 is embedded in the closed end of the movable cylinder 62, facilitating manual operation of the key switch 28, thereby realizing the control of the sterilization unit.

[0054] The above - described embodiments are only the preferred embodiments of the present invention, and do not limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made according to the structure, features, and principles described in the scope of the present invention patent should be included within the scope of the patent application of the present invention.

Claims

1. A suction and drainage device with manually adjustable negative pressure, used to cooperate with a drainage tube to drain exudate from the surgical site, characterized in that: It comprises an auxiliary cover (6), a drainage joint (8) with a two-way valve (7), a locking hand wheel (9), a syringe installed in the auxiliary cover (6), and a three-way unit (11) having both drainage fluid discharge and negative pressure monitoring functions; The auxiliary cover (6) comprises a fixed cylinder (61) and a movable cylinder (62) which are arranged to slide relative to each other; one end of the fixed cylinder (61) is connected to the drainage joint (8) for connecting to the drainage tube; both sides of the other end of the fixed cylinder (61) are rotatably connected to the locking handwheel (9); the locking handwheel (9) is an eccentric wheel structure; the movable cylinder (62) is sleeved in the fixed cylinder (61); a liquid level indicator line (12) is arranged on the outer wall of the movable cylinder (62); the locking handwheel (9) passes through the side wall of the fixed cylinder (61) and is tightly abutted against the movable cylinder (62); The syringe comprises a syringe (2) and a piston rod (18) with a piston (17) and a piston handle (1) arranged at both ends respectively, the syringe (2) being fixed in a fixed cylinder (61), the movable cylinder (62) being slidably sleeved outside the syringe (2), the piston rod (18) being slidably connected in the syringe (2), the piston rod (18) being hollow inside, and the piston rod (18), the syringe (2) and the drainage joint (8) being connected in sequence; The three-way unit (11) comprises a three-way joint (111) and a piston cap (112); a negative pressure indicator line (21) is arranged on the outer wall of the three-way joint (111); a right port (22) of the three-way joint (111) passes through a movable cylinder (62) and is communicated with a piston rod (18); the right port (22) of the three-way joint (111) and the piston rod (18) cooperate to clamp the movable cylinder (62); the piston cap (112) is elastically slidably connected between the right port (22) and the left port (23) of the three-way joint (111); and the piston cap (112) reciprocates to open and close the lower port (24) of the three-way joint (111).

2. The suction and drainage device with manually adjustable negative pressure according to claim 1, characterized in that: The fixed cylinder (61) and the movable cylinder (62) are both cylindrical bodies with one end open, the open ends of the fixed cylinder (61) and the movable cylinder (62) are arranged opposite to each other, the movable cylinder (62) is slidably connected inside the fixed cylinder (61), and the inner wall of the fixed cylinder (61) and the outer wall of the movable cylinder (62) are in close contact with each other; Both ends of the fixing cylinder (61) are provided with fixing rings (13), and ribs (14) are provided between the fixing rings (13) at both ends. The ribs (14) extend axially along the fixing cylinder (61), and the ribs (14) are connected and fixed to the outer wall of the fixing cylinder (61).

3. The suction and drainage device with manually adjustable negative pressure according to claim 2, characterized in that: The drainage joint (8) is arranged at the closed end of the fixed cylinder (61), the two-way valve (7) is arranged at one end of the drainage joint (8), and the other end of the drainage joint (8) is in a tapered tubular shape.

4. The suction and drainage device with manually adjustable negative pressure according to claim 2, characterized in that: The locking hand wheels (9) are arranged on both sides of the open end of the fixed cylinder (61), and the number of the locking hand wheels (9) on each side is two. The two locking hand wheels (9) are arranged on both sides of the rib (14), and the locking hand wheels (9) and the rib (14) are rotatably connected; The locking hand wheel (9) is provided with a toggle block (16), the toggle block (16) is arranged along a tangent line of the locking hand wheel (9), and the toggle block (16) protrudes from the circumferential surface of the locking hand wheel (9).

5. The suction and drainage device with manually adjustable negative pressure according to claim 1, characterized in that: One end of the syringe (2) is detachably arranged in the fixed cylinder (61); one end of the syringe (2) is provided with a nipple (4); the syringe (2) is connected to the drainage joint (8) via the nipple (4); the length of the syringe (2) is shorter than the length of the fixed cylinder (61); there is a gap between the outer wall of the syringe (2) and the inner wall of the fixed cylinder (61); the movable cylinder (62) is arranged between the outer wall of the syringe (2) and the inner wall of the fixed cylinder (61); one end of the movable cylinder (62) extends out of the fixed cylinder (61).

6. The suction and drainage device with manually adjustable negative pressure according to claim 1, characterized in that: The piston rod (18) comprises a hollow rod (181) and a plurality of ribs (182) circumferentially arranged on the circumference of the hollow rod (181); the hollow rod (181) passes through the piston handle (1) and the piston (17); two ends of each rib (182) respectively abut against the piston handle (1) and the piston (17); and the outer wall of the piston (17) is in close contact with the inner wall of the syringe (2).

7. The suction and drainage device with manually adjustable negative pressure according to claim 2, characterized in that: After the piston handle (1) extends out of the syringe (2), it abuts against the closed end of the movable cylinder (62). The three-way unit (11) is arranged at the closed end of the movable cylinder (62). The right port (22) of the three-way joint (111) passes through the closed end of the movable cylinder (62) and then extends into the piston rod (18) and is threadedly connected and fixed to the piston rod (18).

8. The suction and drainage device with manually adjustable negative pressure according to claim 1, characterized in that: The right port (22) of the three-way joint (111) is in the shape of a stepped tube. A hollow cover plate (20) is embedded in the left port (23) of the three-way joint (111). The piston cap (112) is slidably connected between the left port (23) and the right port (22) of the three-way joint (111). The sliding path of the piston cap (112) passes through the lower port (24) of the three-way joint (111). The outer wall of the piston cap (112) is tightly fitted with the inner wall of the three-way joint (111). A compression spring (25) is provided between one end surface of the piston cap (112) and the right port (22) of the three-way joint (111). The compression spring (25) drives the piston cap (112) to close the lower port (24) of the three-way joint (111).

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