A tubular negative pressure drainage device for orthopedics

Abstract

The present invention discloses a tubular negative pressure drainage device for orthopedics, which includes an inner tube located inside the wound and an outer tube located outside the wound. The outer tube is located at the top of the inner tube and the inner tube and the outer tube are communicated with each other. A plurality of uniformly distributed side holes are formed on the side wall of the inner tube, and the inside of the inner tube is filled with sponge. The present invention improves the existing aspirator by stuffing the sponge into the inner tube structure. There are side holes on the inner tube, so there will be no problems such as sponge block falling off and difficulty in replacement. The advantage is that the tubular negative pressure drainage device can be safely used for deeper sinus tracts or wounds of the wound and there will be no risk of sponge shedding, etc., and the negative pressure attraction force inside the wound is more uniform. The structure of the present invention is simple. When the sponge needs to be taken out, it can be taken out completely very conveniently, avoiding the generation of dead space, thereby accelerating the healing of the wound.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and particularly relates to a tubular negative pressure drainer for orthopedics. Background Art

[0002] The negative pressure drainer is used for clinical orthopedic drainage, and is a medical device that guides body fluids such as pus, blood, and liquid exuded or accumulated in the wound surface of the human tissue with surface defects or avulsions to the outside of the body, prevents the accumulation of wound fluid, infection, and promotes wound healing. There are many types of orthopedic negative pressure drainers used clinically, and they are generally made of materials such as sponges, sterile sealing films, and silicone rubber drain tubes. When in use, part of the sponge is placed at the drainage site of the wound surface with skin defects or avulsions, covered with a sealing protective film. After the sealing film is perforated, it is connected to the drainage connecting tube and further connected to other external devices, such as a drainage bottle. The terminal is connected to the negative pressure suction port of the ward equipment belt, and is drained to the outside through the action of the negative pressure of the negative pressure suction end.

[0003] The existing drain tubes have the following disadvantages and deficiencies: (1) The existing drain tubes have insufficient drainage and are prone to blood accumulation and infection inside the wound; (2) Since the drain tubes are not externally connected to a pressure gauge and are all operated with an ear syringe, the pressure of each operation is unknown and uncontrollable. Even if the suction force is controlled to be the same, the pressure of each side hole cannot reach the same, and it cannot be applied to special positions such as the femur, brain tissue, and intestinal tract; (3) The existing drain tubes are prone to blockage during use.

[0004] For the wound surface of the sinus tract type, it is difficult to place the sponge part of the traditional negative pressure suction device. It is necessary to completely place the sponge part at the bottom of the sinus tract to ensure that there is no dead space left and achieve the effect of sufficient drainage. However, it is a very troublesome thing to replace the sponge. It is necessary to open the sinus tract wound to remove the sponge. When the sponge is removed, fine particles fall off due to adhesion, and sometimes it is even difficult to remove the sponge when it falls off. Therefore, there is an urgent need for a drainage device that solves the problems of difficult sponge replacement and related issues. Summary of the Invention

[0005] The purpose of the present invention is to provide a tubular negative pressure drainer for orthopedics, which solves the problems of troublesome sponge replacement and inability to remove the sponge that exist in the existing drainers.

[0006] The technical solution adopted by the present invention is: a tubular negative pressure drainer for orthopedics, including an inner tube located inside the wound and an outer tube located outside the wound. The outer tube is located at the top of the inner tube and the inner tube and the outer tube are connected and communicate with each other. A plurality of uniformly distributed side holes are opened on the side wall of the inner tube. The distance between adjacent side holes from the top to the bottom of the inner tube is the same, and the aperture sizes of the side holes are different. The inside of the inner tube is filled with a VSD sponge.

[0007] The characteristics of the technical solution adopted by the present invention further lie in that,

[0008] The aperture size distribution of the side holes meets the following requirements:

[0009]

[0010] In the formula: The pipe section from hole k to hole k + 1 is the k-th pipe section, k≥1, s dk is the cross-sectional area of hole k, ρ is the density of the pipe, g is the acceleration due to gravity, h f is the head loss along the way, p0 is the suction force at the outlet of the inner pipe, p k is the suction force of the k-th pipe section, s dk is the cross-sectional area of hole k.

[0011] The bottom of the inner pipe is a closed structure.

[0012] The outer pipe is a double-layer sleeve structure, and the inner diameter of the outer pipe is smaller than that of the inner pipe.

[0013] A negative pressure suction port is connected to one end of the outer pipe far from the inner pipe.

[0014] A baffle is horizontally arranged at the connection between the outer pipe and the inner pipe. The baffle is a ring structure, and the outer edge of the baffle is integrally structured with the inner pipe and the outer pipe respectively.

[0015] One end of the outer pipe far from the inner pipe is a flexible pipe.

[0016] The beneficial effects of the present invention are as follows: In the device of the present invention, there is an inner pipe on the surface of the sponge placed at the bottom of the wound or sinus tract at the distal end. The side wall of the inner pipe is provided with side holes, which can ensure that the side walls of the wound or sinus tract are evenly stressed during the negative pressure suction process. The outer pipe is designed with a double-layer sleeve, and its inner diameter is smaller than that of the inner pipe, which ensures that the sponge of the tubular negative pressure drainage device does not fall off. When it needs to be taken out, it can be taken out completely very conveniently, avoiding the generation of dead space, thereby accelerating the healing of the wound. The sponge of the present invention is a VSD sponge, and the sponge has large pores, ensuring that the pressure difference at each position of the sponge is relatively small, so that the attraction force of each part of the sponge is quite the same. The aperture of the side holes of the drainage pipe of the present invention is set according to a certain rule, so that the attraction force is uniform during the use of the drainage pipe, ensuring the drainage effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a structural schematic diagram of a tubular negative pressure drainage device for orthopedics according to the present invention Figure 1 ;

[0018] Figure 2 is a structural schematic diagram of the aperture size design according to the present invention;

[0019] Figure 3Structural schematic of a tubular negative pressure drain for orthopedics according to the present invention Figure 2 ;

[0020] Figure 4 Structural schematic of a tubular negative pressure drain for orthopedics according to the present invention Figure 3 。

[0021] In the figure: 1. Inner tube, 2. Outer tube, 3. Side holes, 4. Baffle, 5. VSD sponge. Specific embodiments

[0022] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0023] As Figure 1 shown, it is a structural schematic diagram of a tubular negative pressure drain for orthopedics according to the present invention, including an inner tube 1 located inside the wound and an outer tube 2 located outside the wound. The outer tube 2 is located at the top of the inner tube 1 and the inner tube 1 and the outer tube 2 are connected and communicate with each other. The inner tube 1 is used for liquid inlet, and the outer tube 2 is used for liquid outlet. The bottom end of the inner tube 1 is a closed structure. A number of evenly distributed side holes 3 are opened on the side wall of the inner tube 1. The side holes 3 of the inner tube 1 are used for liquid inlet, and the inside of the inner tube 1 is filled with a VSD sponge 5.

[0024] One end of the outer tube 2 far from the inner tube 1 is connected with a negative pressure suction port.

[0025] The aperture sizes of the side holes 3 are different, and the distances between adjacent side holes 3 from the top to the bottom of the inner tube 1 are the same. The aperture size distribution of the side holes 3 meets the following requirements:

[0026]

[0027] In the formula: there are k holes from the top to the bottom of the inner tube, k = 1, 2,..., and the section of the tube from hole k to hole k + 1 is the kth section of the tube, s dk is the cross-sectional area of hole k, ρ is the density of the tube, g is the acceleration due to gravity, h<000********** f is the head loss along the way, p0 is the suction force at the outlet of the inner tube, p<000********** k is the suction force of the kth section of the tube, s<000********** dk is the cross-sectional area of hole k.

[0028] As Figure 2 shown, one end of hole k is externally connected to a negative pressure suction port. There are k holes from the top to the bottom of the inner tube, k = 1, 2,.... Let the section of the tube from hole k to hole k + 1 be the kth section of the tube. The inlet cross-sectional area of the kth section of the tube is A<000********** k , and the outlet cross-sectional area is A'<000********** k . For the kth section of the tube, according to Bernoulli's equation, we can obtain

[0029]

[0030] wherein, p k is the suction at the inlet of the k-th pipe section, p' k is the suction at the outlet of the k-th pipe section, ρ is the density, v k is the flow velocity of the k-th pipe section, v' k is the flow velocity of the k-th pipe section, g is the acceleration due to gravity, h f is the head loss along the way.

[0031] According to the law of conservation of mass, we can obtain:

[0032] Q k = A k v k = Q' k = A' k v' k (0.2)

[0033] wherein, the cross-sectional area of orifice k is s dk , the flow velocity is v dk , Q K is the volume flow rate through the inlet of orifice k, Q' k is the volume flow rate through the outlet of orifice k, and the flow rate into the pipe through orifice k is:

[0034] ΔQ k = s dk v dk (0.3)

[0035] Assume that orifice k is very small, then the suction on the left and right cross-sections of orifice k is approximately equal, that is:

[0036] p k = p' k-1 (0.4)

[0037] According to Bernoulli's equation, the flow velocity v dk can be expressed as:

[0038]

[0039] Because it is assumed that orifice k is very small, the left and right cross-sectional areas of orifice k are approximately equal, that is:

[0040] A' k-1 = A k (0.6)

[0041] Therefore, according to equations (0.2) and (0.6), we can obtain:

[0042] A k v k = A k+1 v' k(0.7)

[0043] Analysis:

[0044] For the case where the pipe diameter remains unchanged and the hole diameters are the same, that is

[0045] A k = A k+1 (0.8)

[0046] s dk = s dk+1 (0.9)

[0047] From equations (0.2) and (0.8), we can obtain

[0048] v k = v' k (0.10)

[0049] From equations (0.1) and (0.10), we can obtain

[0050] p k = p' k + ρgh fk (0.11)

[0051] The flow velocity of hole k is

[0052]

[0053] The flow velocity of hole k + 1 is

[0054]

[0055] By comparing equations (0.12) and (0.13), it can be found that the flow velocity v of hole k + 1 dk+1 is greater than the flow velocity v of hole k dk . Also, since the cross-sectional area s of hole k + 1 dk+1 and the cross-sectional area s of hole k dk are equal, according to equation (0.3), the flow rate ΔQ of hole k + 1 k+1 is greater than the flow rate ΔQ of hole k k . The closer to the negative pressure suction port, the greater the suction force of the hole.

[0056] To keep the suction force of each hole the same, the following two solutions can be adopted.

[0057] Solution 1: Keep the pipe diameter unchanged and change the hole diameter.

[0058] When the pipe diameter remains unchanged, that is

[0059] A k = A k+1 (0.14)

[0060] From equations (0.2) and (0.14), we can obtain

[0061] v k = v′ k (0.15)

[0062] From equations (0.1) and (0.15), we can obtain

[0063] p k = p′ k + ρ g h fk (0.16)

[0064] The flow rates of holes k and k + 1 are respectively

[0065]

[0066]

[0067] To make the suction forces of holes k and k + 1 the same, that is

[0068] ΔQ k = ΔQ k+1 (0.19)

[0069] Then it is necessary to satisfy

[0070]

[0071] That is, make the holes near the top of the inner tube smaller and the holes far from the top of the inner tube larger. The solution of the present invention adopts Solution 1.

[0072] Solution 2: Keep the hole diameter unchanged and change the pipe diameter.

[0073] When the hole diameter remains unchanged, that is

[0074] s dk = s dk+1 (0.21)

[0075] To make the suction forces of each hole the same, that is

[0076] ΔQ k = ΔQ k+1 (0.22)

[0077] According to equations (0.3) and (0.21), we can obtain

[0078] v dk = v dk+1 (0.23)

[0079] The flow velocities of holes k and k + 1 can be respectively expressed as

[0080]

[0081]

[0082] Therefore

[0083] p k = p' k (0.26)

[0084] According to equations (0.1) and (0.26), it can be obtained that

[0085]

[0086] That is

[0087]

[0088] According to equation (0.7), it can be obtained that

[0089]

[0090] That is, the diameter of the tube near the top of the inner tube is larger, and the diameter of the tube far from the top of the inner tube is smaller.

[0091] The sponge 5 of the device of the present invention adopts a VSD sponge. The VSD sponge has a larger pore size, and the attraction at its proximal end and distal end is basically the same, and the use effect of the VSD sponge will not be affected by different positions. The sponge 5 is placed in the inner tube 1. Due to the porous material of the VSD sponge, it not only has good water absorption, but also can play a filtering role. During the outward drainage process, blood cell clumps and blood clots will be adsorbed in the sponge and will not enter the tube, which will not cause blockage of the tube and also avoid the formation of foreign bodies. The filtering and blocking effect of the sponge will also block red blood cells, fibrin, etc. and leave them inside the wound, and further organize to form scar tissue, thereby promoting the healing of the wound.

[0092] Such as Figure 3 shown, the bottom end of the inner tube 1 can be a straight tube vertically arranged inside the wound; it can also be a bent tube horizontally arranged inside the wound. Such as Figure 1 shown, the outer tube 2 is a double-layer sleeve structure, and the inner diameter of the outer tube 2 is smaller than the inner diameter of the inner tube 1, so as to ensure that during the operation of the drainage device, the sponge 5 is fixed inside the inner tube 1 and will not run out.

[0093] Such as Figure 4 shown, the outer tube 2 can also be designed to have the same inner diameter as the inner tube 1. A baffle 4 is horizontally provided at the connection between the outer tube 2 and the inner tube 1. The baffle 4 is a ring structure, and the outer edge of the baffle 4 is integrally formed with the inner tube 1 and the outer tube 2 respectively. The sponge 5 cannot pass through the baffle 4 under the action of pressure.

[0094] One end of the outer tube 2 away from the inner tube 1 is a flexible tube, and a switch clamping device is provided on the flexible tube to avoid backflow phenomenon when not in use.

[0095] The working process of the present invention is as follows: The present invention includes a wound inner tube 1 for liquid inlet and a wound outer tube 2 for liquid outlet. One end of the outer tube 2 is connected to a negative pressure suction port. The negative pressure suction device is turned on, and body fluid such as pus, blood, and liquid exuded or accumulated from the surface defect or degloving of the human tissue wound outside the wound or sinus tract is sucked into the inner tube 1 through the side holes 3 and then led out through the outer tube 2. Usually, it is no longer necessary to seal the outside of the wound or sinus tract with a dressing. In special cases, a sterile sealing film can be used to seal the gap between the drainage tube and the wound surface. The external part of the drainage tube is finally connected to the negative pressure suction port of the ward equipment belt.

[0096] The present invention improves the existing suction device by stuffing the sponge into the inner tube structure. There are side holes on the inner tube, and the aperture diameters of the side holes are set according to a certain rule, so that the pressure of each side hole is kept consistent, which is beneficial to the drainage, and avoids the uneven drainage degree at each part inside the wound due to different suction forces during the drainage process, affecting the overall drainage efficiency. The setting of the side holes 3 will not have problems such as sponge block falling off and being difficult to replace. The advantage is that the tubular negative pressure drainage device can be safely used for deeper sinus tracts or wounds, and there is no risk of sponge falling off, and the negative pressure suction force inside the wound is more uniform. The structure of the present invention is simple. When the sponge needs to be taken out, it can be taken out completely very conveniently, avoiding the generation of dead space, thus accelerating the wound healing.

Claims

1. A tubular negative pressure drain for orthopedics, characterized in that, It includes an inner tube (1) located inside the wound and an outer tube (2) located outside the wound. The outer tube (2) is located at the top of the inner tube (1), and the inner tube (1) and the outer tube (2) are in communication. A number of evenly distributed side holes (3) are formed in the side wall of the inner tube (1). The distance between adjacent side holes (3) from the top end to the bottom end of the inner tube (1) is the same, and the aperture sizes of the side holes (3) are different. The inside of the inner tube (1) is filled with a VSD sponge (5). The aperture size distribution of the side holes (3) meets the following requirements: Where: There are holes in the direction from the top to the bottom of the inner tube, = 1, 2, …, the section of the tube from hole to hole + 1 is the th section of the tube, is the cross-sectional area of hole , is the density of the tube, is the acceleration due to gravity, is the head loss along the way, is the suction at the outlet of the inner tube, is the suction of the th section of the tube, is the cross-sectional area of hole + 1; The bottom of the inner tube (1) is a closed structure; The outer tube (2) is a double-layer sleeve structure, and the inner diameter of the outer tube (2) is smaller than the inner diameter of the inner tube (1).

2. The tubular negative pressure drainage device for orthopedics according to claim 1, wherein, One end of the outer tube (2) far from the inner tube (1) is connected with a negative pressure suction port.

3. The tubular negative pressure drainage device for orthopedics according to claim 1, wherein A baffle (4) is horizontally arranged at the connection between the outer tube (2) and the inner tube (1). The baffle (4) is a ring structure, and the outer edge of the baffle (4) is integrally structured with the inner tube (1) and the outer tube (2) respectively.

4. The tubular negative pressure drainage device for orthopedics according to claim 1, characterized in that, One end of the outer tube (2) far from the inner tube (1) is a flexible tube.

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