A hepatic portal flow blocking auxiliary device

Abstract

The application relates to the technical field of medical devices, in particular to a hepatic portal blood flow blocking auxiliary device which comprises a binding belt; a sleeve ring for adjusting the fixed length of the binding belt is slidably matched on the binding belt; a clamping mechanism for fixing the binding belt is arranged on the sleeve ring; a puncture end for blood vessel puncture is arranged at one end of the binding belt; an expansion sac is fixedly connected on the puncture end; an air pipe is communicated with the expansion sac and located in the binding belt; the application has the advantages of simple operation and reliable blocking, and can be used for improving the safety of liver surgery and shortening the surgery time, facilitating the surgery recovery of patients.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to an auxiliary device for blocking hepatic hilum blood flow. Background Technology

[0002] The portal vein occlusion technique is a core method for controlling bleeding in liver surgery. Its core objective is to provide a clear surgical field for liver parenchyma transection and reduce intraoperative bleeding by temporarily blocking blood flow into or out of the liver.

[0003] In existing technologies, the scope and mechanism of hepatic portal blood flow occlusion are generally divided into total hepatic blood flow occlusion, inflow hepatic blood flow occlusion, and selective blood flow occlusion. Total hepatic blood flow occlusion, by simultaneously blocking inflow (hepatic artery and portal vein) and outflow (hepatic vein and inferior vena cava), is suitable for repairing central hepatocellular carcinoma or inferior vena cava injuries. However, this technique requires complete mobilization of the perihepatic ligaments, is complex to perform, and has a significant impact on systemic circulation, easily leading to multi-organ complications postoperatively. Inflow hepatic blood flow occlusion, by blocking the hepatic artery and portal vein to reduce the amount of blood entering the liver, is the most commonly used technique in clinical practice. Its advantages lie in its simplicity and wide applicability, but it cannot control reflux bleeding from the hepatic veins and needs to be combined with measures such as reducing central venous pressure (CVP) to reduce lesion bleeding. Selective blood flow occlusion includes hemihepatic occlusion and segmental hepatic occlusion, which achieves lesion-side blood flow occlusion by dissecting the Glisson sheath or hepatic pedicle while preserving the function of the healthy side of the liver. This technique can prolong the safe occlusion time, but requires senior physicians to perform and carries the risk of accidental injury to the bile duct or blood vessels.

[0004] Therefore, the widely used blood flow occlusion method in clinical practice is the Pringle technique. This involves using a cotton rope, nylon catheter, or a specialized vascular occlusion band to bypass the hepatoduodenal ligament, and then tightening it with vascular clamps or Hem-o-lok clamps to temporarily interrupt blood flow into the liver, thus reducing intraoperative bleeding. However, because the effectiveness of blood flow occlusion is determined based on the tightening effect, fluctuations in the occlusion effect can easily occur, requiring readjustment. Furthermore, since the Pringle technique does not directly occlude the hepatic vein or inferior vena cava, blood may flow back into the liver through the hepatic vein, leading to bleeding from the liver resection surface.

[0005] To address the aforementioned issues, this invention provides a simple and reliable auxiliary device for blocking hepatic portal blood flow, thereby improving the safety of liver surgery and shortening the operation time. Summary of the Invention

[0006] To address the aforementioned problems, this invention provides an auxiliary device for blocking hepatic hilum blood flow, which has the advantages of simple operation and reliable blocking, and is used to improve the safety of liver surgery, shorten operation time, and facilitate patient recovery.

[0007] To achieve the above objectives, the technical solution of the present invention is as follows: a hepatic hilum blood flow blocking auxiliary device, comprising a restraint belt; a collar for adjusting the fixed length of the restraint belt is slidably fitted on the restraint belt, and a clamping mechanism for fixing the restraint belt is provided on the collar;

[0008] One end of the restraint band is equipped with a puncture end for vascular puncture, and an expansion bladder is fixedly connected to the puncture end. The expansion bladder is connected to a trachea, which is located inside the restraint band.

[0009] Furthermore, the collar includes a central block, with a first channel and a second channel fixedly connected to both sides of the central block. A pull rope is provided in the first channel, and a restraint strap is located in the second channel.

[0010] The clamping mechanism includes a fixed plate located inside the first channel and a tensioning bar located in the second channel. The tensioning bar has a pull rope located on both sides of the fixed plate in the first channel. One end of the tensioning bar is fixedly connected to the center block, and the other end of the tensioning bar is in clearance fit with the second channel. The end of the tensioning bar in the second channel is in sliding fit with the center block. A central shaft is coaxially fixedly connected to the center of the fixed plate. The two ends of the central shaft are in rotational fit with the first channel. A spiral guide groove is opened on the central shaft, and a slider is slidably fitted in the guide groove. The slider is fixedly connected to the first channel.

[0011] When the slider is at the lowest point of the guide groove, the central axis is at the highest point of the first channel, and the fixing plate is at the center of the first channel; when the slider is at the highest point of the guide groove, the central axis is at the lowest point of the first channel, and the fixing plate abuts against the pull rope.

[0012] Furthermore, the restraint strap includes a flexible layer, a pull rope is located between the flexible layer and the puncture end, an air reservoir is fixedly connected to the surface of the flexible layer, the air reservoir is connected to the expansion bladder through a trachea, and a one-way valve is provided between the air reservoir and the expansion bladder, the one-way valve can only allow air from the air reservoir to enter the expansion bladder.

[0013] Furthermore, buttons are fixedly connected to both ends of the central shaft, with the buttons located outside the collar.

[0014] Furthermore, a bending plate is provided in the second channel. The bending plate is used to open the second channel, and the bending plate rotates with the central block at the center of the collar.

[0015] The center block has a clamping cavity, the tensioning bar is located inside the clamping cavity, and the clamping cavity has an extension block, which is fixedly connected to the bending plate; when the bending plate opens the second channel, the extension block abuts against the tensioning bar.

[0016] Furthermore, several first pressure sensors are fixedly connected to the surface of the inflatable bladder. The first pressure sensors are electrically connected to a display component, which is located at the top of the collar. The display component includes a control panel and indicator lights.

[0017] The first pressure sensor is used to detect the pressure data when the expansion bladder is in contact with the tissue at the current time. The control panel is used to compare the pressure data with the set start value. If the pressure data is greater than the start value, a start command is sent to the indicator light. If the pressure data is less than the start value, a standby command is sent to the indicator light.

[0018] Furthermore, a second pressure sensor is fixedly connected to the flexible layer surface of the restraint strap. The second pressure sensor is electrically connected to the control panel and is used to measure the contact pressure data during the contact process between the restraint strap and the ligament.

[0019] The control panel is used to compare the contact pressure data with the set reminder value. If the contact pressure data is greater than the reminder value, a flashing command is sent to the indicator light and a start command is sent to the first pressure sensor. If the contact pressure data is less than the reminder value, a standby command is sent to the indicator light and a standby command is sent to the first pressure sensor.

[0020] Furthermore, the surfaces of both the fixing plate and the tensioning strip are fixedly connected with several friction marks.

[0021] Furthermore, an external tube is connected at the center of the puncture end, which is used to deliver external fluid.

[0022] Furthermore, the restraint straps and pull ropes are fixedly connected with several scale lines.

[0023] The above approach has the following beneficial effects:

[0024] 1. This solution uses a loop to move on the restraint band, which allows for adjustment of the basic fixed length of the restraint band, facilitating subsequent tightening of the hepatoduodenal ligament (hereinafter referred to as the ligament). At the same time, after tightening is completed, the restraint band is fixed in position by a clamping mechanism to ensure the blood flow blocking effect, making it convenient to use.

[0025] 2. In this solution, during use, the device is tightened externally by wrapping around the ligaments with a restraint strap to achieve external hemostasis. Then, the device is inserted into the blood vessel through the puncture end to block the bleeding using the expansion bladder, thereby combining external hemostasis to enhance the hemostatic effect.

[0026] 3. This approach combines hemostasis via the contraction of a restraint band and hemostasis via an internal expansion bladder. After the restraint band is loosened, the expansion bladder at the puncture site maintains hemostasis in the main blood vessels, reducing the backflow of hepatic veins into the liver and thus reducing liver bleeding. This improves the safety of liver surgery, shortens the operation time, and facilitates postoperative recovery for the patient.

[0027] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0028] Figure 1 This is an isometric view of an embodiment of the hepatic portal blood flow occlusion auxiliary device of the present invention;

[0029] Figure 2 This is a top view of an embodiment of the hepatic portal blood flow occlusion auxiliary device of the present invention;

[0030] Figure 3 for Figure 2 A schematic cross-sectional view along the AA direction;

[0031] Figure 4 for Figure 3 A schematic diagram of the fixing plate in the middle;

[0032] Figure 5 for Figure 3 A magnified schematic diagram of part B in the middle.

[0033] The reference numerals in the accompanying drawings include: 1. restraint strap; 11. pull rope; 12. puncture end; 2. collar; 21. bending plate; 22. tensioning strip; 23. extension block; 3. fixing plate; 31. button; 32. central shaft; 33. guide groove; 4. expansion bladder. Detailed Implementation

[0034] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0037] The following detailed description illustrates the specific implementation methods:

[0038] Example 1:

[0039] As attached Figures 1 to 5 As shown: A hepatic hilum blood flow blocking auxiliary device includes a restraint belt 1; a collar 2 for adjusting the fixed length of the restraint belt 1 is slidably fitted on the restraint belt 1, and a clamping mechanism for fixing the restraint belt 1 is provided on the collar 2; a puncture end 12 for vascular puncture is provided at one end of the restraint belt 1, and an expansion balloon 4 is fixedly connected to the puncture end 12, the expansion balloon 4 is connected to a trachea, and the trachea is located inside the restraint belt 1.

[0040] The collar 2 includes a central block, with a first channel and a second channel fixedly connected to both sides of the central block. A pull rope 11 is installed in the first channel, and a restraint strap 1 is located in the second channel. The clamping mechanism includes a fixing plate 3 located inside the first channel and a tensioning bar 22 located in the second channel. The pull rope 11 in the first channel is located on both sides of the fixing plate 3. One end of the tensioning bar 22 is fixedly connected to the central block, and the other end of the tensioning bar 22 is in clearance fit with the second channel. The end of the tensioning bar 22 in the second channel is in sliding fit with the central block. A central shaft 32 is coaxially fixedly connected to the center of the fixing plate 3. Both ends of the central shaft 32 are rotatably fitted with the first channel. A spiral guide groove 33 is opened on the central shaft 32, and a slider is slidably fitted within the guide groove 33. The slider is fixedly connected to the first channel. Several friction marks are fixedly connected to the surfaces of both the fixing plate 3 and the tensioning bar 22. The friction texture increases the friction between the fixing plate 3 and the pull rope 11, as well as the friction between the tensioning strip 22 and the restraint strap 1, thereby improving the fixing effect on the restraint strap 1 and the pull rope 11 and ensuring the adjustment of the tightening degree.

[0041] When the slider is at the lowest point of the guide groove 33, the central shaft 32 is at the highest point of the first channel, and the fixing plate 3 is at the center of the first channel; when the slider is at the highest point of the guide groove 33, the central shaft 32 is at the lowest point of the first channel, and the fixing plate 3 abuts against the pull rope 11.

[0042] The restraint strap 1 includes a flexible layer, and the pull rope 11 is located between the flexible layer and the puncture end 12. An air reservoir is fixedly connected to the surface of the flexible layer. The air reservoir is connected to the expansion bladder 4 through an air tube, and a one-way valve is provided between the air reservoir and the expansion bladder 4. The one-way valve allows air from the air reservoir to enter the expansion bladder 4.

[0043] The specific implementation process is as follows:

[0044] First, the restraint strap 1 is installed on the collar 2. As the restraint strap 1 slides inside the collar 2, the ligament is placed inside the second channel by the restraint strap 1. The restraint strap 1 is positioned between the tension bar 22 and the center block. The pull rope 11 is placed inside the first channel, so that the restraint strap 1 forms a circular loop to place the ligament. When it is necessary to tighten the restraint strap 1, the tension bar 22 is wrapped around the pull rope 11. As the pull rope 11 is stretched, it drives the tension bar 22 to move, so that the pull rope 11 continuously drives the tension bar 22 to move towards the center of the collar 2 (center block). The restraint strap 1 is fixed by the clamping action of the tension bar 22.

[0045] After the pull rope 11 clamps the ligament, the central shaft 32 is manually pressed, causing the slider to move inside the guide groove 33. Based on the slider's position along the guide groove 33, the rotation angle of the fixing plate 3 is adjusted. When the central shaft 32 is manually pressed downwards and positioned at the lowest point of the first channel, the fixing plate 3 misaligns and locks the pull ropes 11 on both sides to maintain the tightness of the pull ropes 11. When the central shaft 32 is manually pressed downwards and positioned at the lowest point of the first channel, the fixing plate 3 no longer locks the pull ropes 11, allowing for adjustment of the tightness of the pull ropes 11 and ensuring convenience during use.

[0046] The manual movement of the collar 2 on the restraint band 1 allows for adjustment of the basic fixed length of the restraint band 1, facilitating subsequent tightening of the hepatoduodenal ligament. Simultaneously, after tightening, the clamping mechanism fixes the restraint band 1 in place to ensure effective blood flow occlusion and ease of use. Meanwhile, the air reservoir forms a buffer on the ligament or tissue surface, using pressure dispersion to reduce tissue damage during contact between the restraint band 1 and external tissues. Furthermore, the pressure during the tightening of the restraint band 1 compresses the air inside the air reservoir, allowing it to enter the expansion bladder 4, which then blocks blood vessels within the body, enhancing the blood flow occlusion effect.

[0047] The device achieves external hemostasis by tightening the restraint strap 1 around the ligaments, and then using the expansion balloon 4 to block the blood vessel through the puncture end 12, thus combining external hemostasis to enhance the hemostatic effect. After the restraint strap 1 is loosened, the expansion balloon 4 on the puncture end 12 maintains hemostasis in the main blood vessels, reducing hepatic venous reflux back into the liver, thereby reducing liver bleeding, improving the safety of liver surgery, shortening operation time, and facilitating postoperative recovery.

[0048] Example 2:

[0049] The difference from Embodiment 1 is that buttons 31 are fixedly connected to both ends of the central shaft 32, and the buttons 31 are located outside the collar 2.

[0050] The specific implementation process is as follows: By using button 31, the contact area between the central shaft 32 and the finger is increased, so that the movement of the central shaft 32 can be adjusted manually, thereby improving the controllability of the fixing of the fixing plate 3 and the pull rope 11 during use.

[0051] Example 3:

[0052] The difference from Embodiment 2 is that a bending plate 21 is provided in the second channel. The bending plate 21 is used to open the second channel. The bending plate 21 is rotatably engaged with the center block at the center of the collar 2. A clamping cavity is opened in the center block. The tensioning strip 22 is located inside the clamping cavity. An extension block 23 is provided in the clamping cavity. The extension block 23 is fixedly connected to the bending plate 21. When the bending plate 21 opens the second channel, the extension block 23 abuts against the tensioning strip 22.

[0053] The specific implementation process is as follows: The second channel is opened by rotating the bending plate 21. The bending plate 21 drives the extension block 23 to clamp the tensioning strip 22, ensuring the fixation of one end of the restraint strap 1. This facilitates the adjustment and control of the stretching length of the pull rope 11 on the other side, improving the convenience of use.

[0054] Example 4:

[0055] The difference from Embodiment 3 is that a number of first pressure sensors are fixedly connected to the surface of the expansion bladder 4. The first pressure sensors are electrically connected to a display component (not shown in the figure). The display component is located at the top of the collar 2 and includes a control panel and an indicator light. The first pressure sensors are used to detect the pressure data when the expansion bladder 4 is in contact with the tissue at the current time. The control panel is used to compare the pressure data with the set start value. If the pressure data is greater than the start value, a start command is sent to the indicator light. If the pressure data is less than the start value, a standby command is sent to the indicator light.

[0056] For example, during the inflation of the balloon 4, the pressure data is compared with the activation value to determine whether the balloon 4 is causing an internal blockage to the blood vessels. The activation status of the indicator light provides a reminder so that medical staff can remove the restraint band 1, thus ensuring the safety of liver surgery.

[0057] Example 5:

[0058] The difference from Embodiment 4 is that a second pressure sensor is fixedly connected to the flexible layer surface of the restraint band 1. The second pressure sensor is electrically connected to the control panel and is used to measure the contact pressure data during the contact process between the restraint band 1 and the ligament. The control panel is used to compare the contact pressure data with a set reminder value. If the contact pressure data is greater than the reminder value, a flashing command is sent to the indicator light and a start command is sent to the first pressure sensor. If the contact pressure data is less than the reminder value, a standby command is sent to the indicator light and a standby command is sent to the first pressure sensor.

[0059] For example, during the tightening process of the restraint band 1, after the restraint band 1 clamps with the ligament, the ligament will apply pressure to the second pressure sensor. Based on the contact pressure data, the sensor compares the data with the warning value and flashes the indicator light to remind medical staff to reduce the degree of tightening and thus reduce tissue damage. At the same time, the sensor activates the operation of the first pressure sensor to reduce daily energy consumption and extend the working time of electrical components.

[0060] In another embodiment, the puncture end 12 is also provided with a flow rate sensor for detecting changes in blood flow velocity. When the contact pressure data is greater than the warning value, a start command is sent to the flow rate sensor. By comparing the flow rate change with the warning value corresponding to blood vessel blockage, a blood flow termination warning command is sent to the indicator light so that medical personnel can determine whether the blood vessel in the body is blocked by the expansion bladder 4 and stop the bleeding.

[0061] Example 6:

[0062] The difference from Example 5 is that an external tube is connected to the center of the puncture end 12, which is used to deliver external fluid (e.g., normal saline). By injecting normal saline into the external tube, the blood volume in the blood vessels is replenished to maintain stable blood pressure, thereby reducing the occurrence of hepatic vein reflux back into the liver after the blood flow blockage is restored, and improving the safety of liver surgery.

[0063] Example 7:

[0064] The difference from Embodiment 6 is that several scale lines (not shown in the figure) are fixedly connected to the restraint strap 1 and the pull rope 11.

[0065] The specific implementation process is as follows: The size of the scale mark when the restraint strap 1 and the pull rope 11 pass through the loop 2 is so as to determine the tightness of the restraint strap 1 based on the scale reading of the restraint strap 1 and the pull rope 11.

[0066] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A portal vein blood flow occlusion auxiliary device, comprising a restraint strap (1); characterized in that, The restraint strap (1) is slidably fitted with a collar (2) for adjusting the fixed length of the restraint strap (1), and the collar (2) is provided with a clamping mechanism for fixing the restraint strap (1); One end of the restraint band (1) is provided with a puncture end (12) for vascular puncture. An expansion bladder (4) is fixedly connected to the puncture end (12). The expansion bladder (4) is connected to a trachea, which is located inside the restraint band (1).

2. The auxiliary device for blocking hepatic blood flow according to claim 1, characterized in that, The collar (2) includes a central block, and a first channel and a second channel are fixedly connected to both sides of the central block. A pull rope (11) is provided in the first channel, and a restraint strap (1) is located in the second channel. The clamping mechanism includes a fixed plate (3) located inside the first channel and a tensioning bar (22) located in the second channel. The pull rope (11) in the first channel is located on both sides of the fixed plate (3). One end of the tensioning bar (22) is fixedly connected to the center block, and the other end of the tensioning bar (22) is in clearance fit with the second channel. The end of the tensioning bar (22) located in the second channel is in sliding fit with the center block. The fixed plate (3) is coaxially fixedly connected to a central shaft (32). The two ends of the central shaft (32) are in rotational fit with the first channel. A spiral guide groove (33) is opened on the central shaft (32). A slider is slidably fitted in the guide groove (33). The slider is fixedly connected to the first channel. When the slider is at the lowest point of the guide groove (33), the central shaft (32) is at the highest point of the first channel, and the fixing plate (3) is at the center of the first channel; when the slider is at the highest point of the guide groove (33), the central shaft (32) is at the lowest point of the first channel, and the fixing plate (3) abuts against the pull rope (11).

3. The auxiliary device for blocking hepatic blood flow according to claim 2, characterized in that, The restraint strap (1) includes a flexible layer, and the pull rope (11) is located between the flexible layer and the puncture end (12). An air reservoir is fixedly connected to the surface of the flexible layer. The air reservoir is connected to the expansion bladder (4) through the trachea. A one-way valve is provided between the air reservoir and the expansion bladder (4). The one-way valve can only allow the air in the air reservoir to enter the expansion bladder (4).

4. The auxiliary device for blocking hepatic blood flow according to claim 3, characterized in that, Buttons (31) are fixedly connected to both ends of the central shaft (32), and the buttons (31) are located outside the collar (2).

5. The auxiliary device for blocking hepatic blood flow according to claim 4, characterized in that, The second channel is provided with a bending plate (21), which is used to open the second channel. The bending plate (21) rotates with the center block at the center of the collar (2). The center block has a clamping cavity, the tension bar (22) is located inside the clamping cavity, and the clamping cavity is provided with an extension block (23), which is fixedly connected to the bending plate (21); when the bending plate (21) opens the second channel, the extension block (23) abuts against the tension bar (22).

6. The auxiliary device for blocking hepatic blood flow according to claim 5, characterized in that, Several first pressure sensors are fixedly connected to the surface of the expansion bladder (4). The first pressure sensors are electrically connected to a display component. The display component is located on the top of the collar (2). The display component includes a control panel and indicator lights. The first pressure sensor is used to detect the pressure data when the expansion bladder (4) is in contact with the tissue at the current time. The control panel is used to compare the pressure data with the set start value. If the pressure data is greater than the start value, a start command is sent to the indicator light. If the pressure data is less than the start value, a standby command is sent to the indicator light.

7. The auxiliary device for blocking hepatic blood flow according to claim 6, characterized in that, A second pressure sensor is fixedly connected to the flexible layer surface of the restraint band (1). The second pressure sensor is electrically connected to the control panel. The second pressure sensor is used to measure the contact pressure data during the contact process between the restraint band (1) and the ligament. The control panel is used to compare the contact pressure data with the set reminder value. If the contact pressure data is greater than the reminder value, a flashing command is sent to the indicator light and a start command is sent to the first pressure sensor. If the contact pressure data is less than the reminder value, a standby command is sent to the indicator light and a standby command is sent to the first pressure sensor.

8. The auxiliary device for blocking hepatic blood flow according to claim 7, characterized in that, The surfaces of the fixing plate (3) and the tensioning strip (22) are both fixedly connected with several friction marks.

9. The auxiliary device for blocking hepatic blood flow according to claim 8, characterized in that, An external tube is connected at the center of the puncture end (12), which is used to transport external liquid.

10. The auxiliary device for blocking hepatic blood flow according to claim 9, characterized in that, Several scale lines are fixedly connected to the restraint strap (1) and the pull rope (11).

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