CN219557440U - Hepatic portal blood flow blocking device - Google Patents

Abstract

The utility model discloses a hepatic portal blood flow blocking device which comprises a locking mechanism, a tension indicating mechanism and a blocking belt, wherein the tension indicating mechanism is connected between the locking mechanism and the blocking belt, and the locking mechanism is suitable for locking the blocking belt to form a binding space and unlocking the blocking belt to adjust the binding space. According to the technical scheme, the tension indicating mechanism is arranged on the hepatic portal blood flow blocking device to feed back the magnitude of the binding pressure, so that the optimal blood flow blocking effect is realized, and the bound part of a patient is prevented from being damaged due to overlarge binding pressure or the blood flow blocking is not thorough due to the overlarge binding pressure. Through setting up locking mechanism and blocking the locking and unlocking cooperation of area to can realize blocking repeatedly and recovering the blood flow according to the operation process, the cooperation tension indicating mechanism can ensure that the pressure that produces when blocking the blood flow at every turn can be referenced from beginning to end, the size is unanimous. The technical scheme of the utility model can be fully implanted into the body of an operator without increasing or occupying a poking hole and affecting the visual field and operation of the laparoscope.

Description

Hepatic portal blood flow blocking device

Technical Field

The utility model relates to the technical field of medical appliances, in particular to a hepatic portal blood flow blocking device.

Background

Liver is a human organ with abundant blood supply, and the liver operation process needs to block blood flow to prevent massive hemorrhage in the operation process, and the hepatic portal blood flow blocking device in the related art is used for controlling binding pressure according to the operation experience of doctors during binding.

Disclosure of Invention

The present utility model aims to solve the technical problems in the related art at least to some extent. The utility model provides a hepatic portal blood flow blocking device.

To achieve the above object, the present utility model discloses a hepatic portal blood flow blocking device comprising a locking mechanism, a tension indicating mechanism and a blocking strap, wherein the tension indicating mechanism is connected between the locking mechanism and the blocking strap, the locking mechanism is adapted to lock the blocking strap to form a binding space, and is also adapted to unlock the blocking strap to release the binding space

In some embodiments of the utility model, the tension indicating mechanism is adapted to elastically deform in its direction of extension under the force of a force.

In some embodiments of the utility model, the tension indicating mechanism comprises a resilient deformation body, one end of which is connected to the locking mechanism, the other end of which is connected to the blocking strap, and a pointer, which is connected to one of the locking mechanism and the blocking strap and extends towards the other of the locking mechanism and the blocking strap, the resilient deformation body and/or the pointer being provided with an indication portion.

In some embodiments of the present utility model, the elastic deformation body is provided with a cavity along the length direction thereof, the pointer is arranged in the cavity, and the elastic deformation body is transparent.

In some embodiments of the utility model, the indicator is an indicator scale provided to the elastic deformation body.

In some embodiments of the utility model, the blocking strap is provided with a ratchet along its length, and the locking mechanism comprises a pawl configured to be resiliently movable, the blocking strap being adapted to pass through the locking mechanism to engage the ratchet with the pawl to effect locking of the blocking strap.

In some embodiments of the utility model, the blocking strap has first and second opposite sides, the first side facing the strapping space when the strapping space is formed, the second side facing away from the strapping space, the ratchet tooth being provided on the second side.

In some embodiments of the present utility model, the locking mechanism further includes a pressing handle, one end of the pressing handle is provided on the pawl, and the other end of the pressing handle is suspended and adapted to be pressed to separate the pawl from the ratchet, so as to unlock the blocking strap.

In some embodiments of the utility model, the locking mechanism further comprises a locking seat provided with a locking space for the blocking strap to pass through, the pawl extends towards the locking space, and the pressing handle extends away from the locking space.

In some embodiments of the present utility model, the pressing handle and the pawl form a lever structure, the pawl or the middle of the pressing handle and the pawl is connected with the lock base through a flexible hinge, and the pressing handle extends away from the locking space to a greater extent than the pawl extends toward the locking space.

According to the technical scheme, the tension indicating mechanism is arranged on the hepatic portal blood flow blocking device to feed back the magnitude of the binding pressure, so that the optimal blood flow blocking effect is realized, and the phenomenon that the bound part (such as a hepatic duodenal ligament) of a patient is damaged due to excessive binding pressure or the blood flow blocking is incomplete due to the too low binding pressure is avoided. Through setting up locking mechanism and blocking the locking and unlocking cooperation of area to can realize blocking repeatedly and recovering the blood flow according to the operation process, the cooperation tension indicating mechanism can ensure that the pressure that produces when blocking the blood flow at every turn can be referenced from beginning to end, the size is unanimous. The hepatic portal blood flow blocking device provided by the technical scheme of the utility model is of a flexible strip-shaped structure, can be fully implanted into a patient through the puncture hole of the abdominal cavity, is simple and quick to operate under the laparoscope, does not need to increase or occupy the puncture hole, and does not influence the visual field and operation of the laparoscope.

Additional advantages of the utility model 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 utility model.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other designs can be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a portal blood flow blocking device in some embodiments;

FIG. 2 is a cross-sectional view of a portal blood flow blocking device in some embodiments;

FIG. 3 is a schematic binding diagram of a portal blood flow blocking device in some embodiments;

FIG. 4 is a schematic drawing of tension change of the tension indicating mechanism of the portal blood flow blocking device (wherein one of the tension indicating mechanisms does not show the elastoplasty);

FIG. 5 is a schematic diagram of a portal blood flow blocking device (pointer and locking device connected) in some embodiments;

FIG. 6 is a schematic diagram of a locking mechanism of a portal blood flow blocking device in some embodiments;

fig. 7 is a schematic view of an elastic deformation body of the portal blood flow blocking device in some embodiments.

Reference numerals illustrate:

a lock mechanism 1000, a lock base 1100, a lock space 1110, a pawl 1200, and a pressing handle 1300;

tension indicating mechanism 2000, elastic deformation body 2100, cavity 2110, pointer 2200, first end 2210, second end 2220, indicator 2300;

a blocking band 3000, a first side 3100, a second side 3200, ratchet teeth 3210, a guide surface 3211, and an abutment surface 3212;

the space 4000 is bundled.

The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.

In the present utility model, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

Hepatectomy is a major treatment for hepatocellular carcinoma, and also for hepatic hemangioma, benign tumors of the liver, and other diseases. Along with the gradual progress of laparoscopic surgery becoming the most preferred way of considering hepatectomy, laparoscopic surgery has a number of advantages including small trauma, few complications, less pain after the patient is operated, quick recovery, short hospital stay, etc. However, laparoscopic surgery has the disadvantages of small operation space, limited channel size and visual field, flexible and convenient instrument operation compared with open surgery (human hand), and the like, and challenges to standard liver-cutting operation procedures such as hepatic portal blood flow blocking and the like.

The liver is a human organ with very abundant blood supply and has multiple complex functions of digestion, immunity, metabolism and the like. One of the keys to success of liver cutting surgery is to control intraoperative hemorrhage. On the one hand, the intraoperative massive hemorrhage is the main reason for the need to switch to open surgery for laparoscopic surgery. On the other hand, increased bleeding during hepatectomy is also a risk factor leading to increased postoperative morbidity and mortality.

The blood flow blocking technology is one of the main power for reducing bleeding in operation and promoting the rapid development of liver surgery. The liver blood flow blocking method is a variety of methods, and most commonly used are a complete liver blood flow blocking method, an intermittent liver blood flow blocking method and a half-bar liver blood flow blocking method, and in order to block blood flow, the method needs to be implemented by using corresponding medical instruments. Therefore, the present utility model provides a portal blood flow blocking device capable of precisely controlling the binding pressure, intuitively realizing the optimal blood flow blocking effect, preventing the patient from being damaged by the excessive pressure (hereinafter, the duodenal ligament will be described as an example), and preventing the blood flow from being blocked incompletely due to the too low pressure.

As shown in connection with fig. 1-3, in some embodiments of the present utility model, a portal blood flow blocking device includes a locking mechanism 1000, a tension indicating mechanism 2000, and a blocking strap 3000, the tension indicating mechanism 2000 being coupled between the locking mechanism 1000 and the blocking strap 3000, the locking mechanism 1000 being adapted to lock the blocking strap 3000 to form a strapping space 4000, and also adapted to unlock the blocking strap 3000 to adjust the strapping space 4000.

When the hepatic portal blood flow blocking device is in the non-binding state, the whole body of the hepatic portal blood flow blocking device is unfolded to be in a strip shape, wherein the blocking band 3000 is a main component for forming the binding space 4000, has a longer length, and the blocking band 3000 is integrally formed into a flat strip-shaped structure, and can have certain elasticity and flexibility, so that the hepatic portal blood flow blocking device is easier to bend to realize the matching with the locking mechanism 1000. For example, the occluding tape 3000 may be made of biocompatible plastic, rubber, or carbon fiber, and the like, typically between 100-200mm in length, 5-10mm in width, and 0.5-2.5mm in thickness.

The lock mechanism 1000 is a mechanism for achieving locking and unlocking of the occluding tape 3000, and can achieve locking and unlocking of the occluding tape 3000 when the duodenal ligament is bundled. It will be appreciated that the locking mechanism 1000 locks the occluding tape 3000 to form a strapping space 4000. The strapping space 4000 is formed by the combination of the locking mechanism 1000, the tension indicating mechanism 2000 and the occluding tape 3000, with the duodenal ligament being located in the strapping space 4000 and thereby being strapped. When the blocking band 3000 is locked by the locking mechanism 1000, the locking mechanism 1000 and the blocking band 3000 cannot move relatively, so that the size of the binding space 4000 formed is unchanged, and compression of the duodenal ligament, that is, compression of the blood vessel is realized, and blood flow into the liver is interrupted or controlled. Since the length of the occluding tape 3000 is longer than the locking mechanism 1000 and the tension indicating mechanism 2000, compression of the duodenum may be considered to be accomplished primarily by the occluding tape 3000.

For example, the procedure for using the portal blood flow blocking device is as follows: when the laparoscopic descending hepatic portal is blocked, the blocking band 3000 is penetrated from the lower part of the duodenal ligament by using a pair of laparoscopic forceps, then the blocking band 3000 is wound to be matched with the locking mechanism 1000 and is tensioned, at the moment, the blocking band 3000 is locked under the action of the locking mechanism 1000, and a proper binding space 4000 is formed, so that the binding of the duodenal ligament is formed, and the liver blood flow is interrupted or controlled.

In the laparoscopic surgery, the blood flow into the liver cannot be interrupted for a long time, otherwise ischemic injury is easily caused to the liver, and blood flow upstream of the liver is easily deposited and blocked, and even thrombus is formed. The locking mechanism 1000 is also configured to unlock the occluding tape 3000 to release the strapping space 4000 for restoration of blood flow supply. For example, in laparoscopic surgery, the locking mechanism 1000 may be controlled by a laparoscopic forceps to unlock the blocking band 3000, the blocking band 3000 is released, that is, the bundling space 4000 is released, and at this time, the blocking band 3000 releases the bundling of the duodenal ligament, that is, the compression of the blood vessel under the action of its own tension or under the pushing of another forceps, thereby restoring the blood supply to the liver. The locking mechanism 1000 may lock the blocking band 3000 for 15-20min, and then the locking mechanism 1000 may unlock the blocking band 3000 for 5min, and the above steps are repeated to supply and interrupt blood flow until the liver cutting operation is completed.

It will be appreciated that the locking mechanism 1000 may unlock the blocking strap 3000 to release the strapping space 4000 either by enlarging the strapping space 4000 or by eliminating the strapping space 4000. The binding space 4000 is increased, that is, the binding needs to be performed loose after a certain time of binding, so that the restoration supply of blood flow is realized. And the elimination of the binding space 4000 is performed after the laparoscopic surgery is completed, the locking mechanism 1000 needs to be controlled to unlock the blocking tape 3000, so that the blocking tape 3000 and the locking mechanism 1000 are separated, and at this time, the binding space 4000 disappears, so that the hepatic portal blood flow blocking device can be conveniently taken out from the abdominal cavity of the patient.

As described above, in the laparoscopic surgery, the locking mechanism 1000 is required to repeatedly lock and unlock the blocking band 3000, and it is critical to ensure that the locking degree is consistent between the front and rear times, and the blocking effect on blood flow is inconsistent when the locking degree is inconsistent, and the time is wasted due to the repeated adjustment when the locking degree is inconsistent, and the duodenal ligament is damaged due to bleeding caused by incomplete blood flow blocking or excessive binding pressure when the locking degree is heavy. For this purpose, in this embodiment, a tension indicating mechanism 2000 is provided, the tension indicating mechanism 2000 is connected between the lock mechanism 1000 and the blocking belt 3000, and two tension indicating mechanisms 2000 are provided. When the portal blood flow blocking device forms the binding space 4000, the locking mechanism 1000, the tension indicating mechanism 2000 and the blocking belt 3000 form a closed annular structure together, and since the portal blood flow blocking device can press the duodenal ligament during binding, the compression degree of the portal blood flow blocking device to the blood vessel is in direct proportion or positive correlation with the tensioning degree (tension) of the blocking belt 3000, at the moment, the tension indicating mechanism 2000 can be acted by the force of the blocking belt 3000, the tension indicating mechanism 2000 can form an indication according to the acted force, and the indication can feed back the current binding pressure. That is, the tension indicating mechanism 2000 provides a visual indication for the current binding pressure, and in the surgical process, even if the unlocking and locking of the blocking band 3000 need to be repeatedly implemented, the front and rear binding effects can be ensured to be consistent, thereby implementing the optimal blocking effect of the blood flow in the whole process, avoiding wasting long time for debugging, and saving the surgical time.

It will be appreciated that the tension indicating mechanism 2000 may be configured to indicate the magnitude of the current binding pressure, and the indication provided by the tension indicating mechanism 2000 may be based on a relative position or may be based on a numerical value, i.e., the tension indicating mechanism 2000 may be configured to translate into a corresponding indication using the force applied thereto. For example, since the tension indicating mechanism 2000 is subjected to the force of the blocking tape 3000, it may be designed to be deformable, and different deformation states of the tension indicating mechanism 2000 correspond to different binding pressures, so that a position reference may be formed to give an indication. Alternatively, the tension indicating mechanism 2000 may be configured to display a force value, to translate the force applied to a particular value, in a manner similar to a spring balance. Of course, the manner of the tension indicating mechanism 2000 is not limited to the first two, and the purpose is to feed back the current magnitude of the binding pressure.

The tension indicating mechanism 2000 may set a plurality of indication states, each representing a different binding pressure, for example, a corresponding indication may be set corresponding to a portal vein and hepatic artery total occlusion, a portal vein total occlusion and hepatic artery partial occlusion, etc. In laparoscopic surgery, place the patient's abdominal cavity with the hepatic portal blood flow blocking device in order to bind the duodenal ligament, doctor adjusts suitable binding state according to the different instructions on the tension indicating mechanism 2000, and in the locking and unlocking process that is repeated, tension indicating mechanism 2000 can be for different binding states in order to instruct, ensures accurate control, prevents that pressure is too big and damage the duodenal ligament, also can prevent that pressure is too low and blood flow is blocked incompletely to realize best blood flow blocking effect. Because of the different conditions of different patients, based on the indication of the tension indicating mechanism 2000, the locking and unlocking of the blocking band 3000 by the locking mechanism 1000 can achieve fine adjustment of the binding state so as to more precisely control the blocking and supply of blood flow.

As can be seen from the description, the hepatic portal blood flow blocking device is integrally placed in the abdominal cavity of a patient to bind the duodenal ligament, is a fully-implanted scheme, is small and compact, does not occupy excessive space, is simple and convenient to operate under a laparoscope, does not need to increase or occupy a poking hole, does not influence the visual field and operation of the laparoscope, and is extremely convenient to use.

It will be appreciated that as a medical device for binding the duodenal ligament in a surgical operation, the whole hepatic portal blood flow blocking device should be made of a biocompatible material having a certain flexibility, elasticity and strength, and may be coated on the surface of the product according to actual needs so as not to easily damage the contacted tissue when performing a blood flow blocking operation.

According to the technical scheme, the tension indicating mechanism 2000 is arranged on the hepatic portal blood flow blocking device to feed back the magnitude of the binding pressure, so that the optimal blood flow blocking effect is realized, and the situation that the duodenal ligament is damaged due to overlarge binding pressure or the blood flow blocking is incomplete due to overlarge binding pressure is avoided. By providing the locking mechanism 1000 and the locking and unlocking mechanism of the blocking tape 2000, repeated blocking and restoration of blood flow can be realized according to the operation progress, and the tension indicating mechanism 2000 can ensure that the pressure generated during each blocking of blood flow can be referenced back and forth, and the sizes are consistent. The hepatic portal blood flow blocking device of the technical scheme of the utility model can be fully implanted into the body of an operator, is simple and quick to operate under the laparoscope, does not need to increase or occupy a poking hole, and does not influence the visual field and operation of the laparoscope.

In some embodiments of the present utility model, as shown in fig. 3 and 4, the tension indicating mechanism 2000 is adapted to elastically deform along its length direction under the action of force, so that the structure of the whole hepatic portal blood flow blocking device is simpler and the indication of different blocking effects is easier to achieve.

Specifically, when the tension indicating mechanism 2000 binds the duodenal ligament with the portal blood flow blocking device, the tension indicating mechanism 2000 can be elastically deformed in the length direction thereof under the tensioning action of the blocking band 3000, that is, the tension indicating mechanism 2000 is deformed to generate different position changes so as to realize the indication of the binding pressure. For example, the greater the elastic deformation of the tension indicating mechanism 2000, the greater the binding pressure, and thus the more blood flow blocking is achieved, whereas when the elastic deformation of the tension indicating mechanism 2000 is smaller, the less the binding pressure is represented, and thus the partial blood flow blocking is achieved. It will be appreciated that different variables of the tension indicating mechanism 2000 form different indications, and that different indications correspond to different blood flow blocking effects, such that during a procedure, regulation of blood flow blocking may be achieved according to different indications.

Because the tension indicating mechanism 2000 is connected between the locking mechanism 1000 and the blocking belt 3000, in the process of binding the duodenal ligament, the locking mechanism 1000, the tension indicating mechanism 2000 and the blocking belt 3000 form a closed ring shape, the blocking belt 3000 can directly exert force on the tension indicating mechanism 2000, tension generated by the blocking belt 3000 is prevented from being separated to other parts, the tension indicating mechanism 2000 indicates binding pressure more accurately, and the tension indicating mechanism 2000 is elastically deformed into different position changes without any electronic components to realize the indication of the binding pressure, so that the cost is greatly reduced.

Alternatively, as shown in conjunction with fig. 4 and 5, in some embodiments of the present utility model, the tension indicating mechanism 2000 includes an elastic deformation body 2100 and a pointer 2200, one end of the elastic deformation body 2100 is connected to the locking mechanism 1000, the other end of the elastic deformation body 2100 is connected to the blocking band 3000, the pointer 2200 is connected to one of the locking mechanism 1000 and the blocking band 3000, and extends toward the other of the locking mechanism 1000 and the blocking band 3000, and the elastic deformation body 2100 and/or the pointer 2200 are provided with an indication portion 2300, so that indication of the magnitude of binding pressure is effectively achieved.

Specifically, the elastic deformation body 2100 is a strip-shaped structure made of a material capable of realizing elastic deformation, for example, the elastic deformation body 2100 is a strip-shaped structure made of a transparent silica gel material, and may be flat strip-shaped or tubular. Of course, the elastic deformation body 2100 may be a spring. Alternatively, the elastic deformable body 2100 includes a spring and a protective cover covering the outside of the spring, and the spring and the protective cover are connected to the locking mechanism 1000 and the blocking band 3000, respectively. Regardless of the materials and arrangements used to make the elastic deformation body 2100, it is necessary to ensure that one end of the elastic deformation body 2100 is connected to the locking mechanism 1000 and the other end is connected to the blocking band 3000, so that when the locking mechanism 1000 locks the blocking band 3000, the closed strapping space 4000 is realized and elastic deformation is realized under the tension of the blocking band 3000.

The pointer 2200 needs to be connected to one of the locking mechanism 1000 and the blocking band 3000 and extend toward the other. When the duodenal ligament is bound, under the tension of the blocking band 3000, when the elastic deformation body 2100 is stretched, since one end (first end 2210) of the pointer 2200 is connected to one of the locking mechanism 1000 and the blocking band 3000, the other end (second end 2220) of the pointer 2200 is changed in position with respect to the other of the locking mechanism 1000 and the blocking band 3000 during the stretching of the elastic deformation body 2100, whereas when the elastic deformation body 2100 is contracted, the other end of the pointer 2200 is also changed in position with respect to the other of the locking mechanism 1000 and the blocking band 3000.

As shown in fig. 4, 5 and 7, in order to facilitate the observation of the relative position of the pointer 2200, an indication portion 2300 is provided on the elastic deformation body 2100 and/or the pointer 2200, and the indication portion 2300 may be provided to more intuitively identify the current position of the pointer 2200, thereby more intuitively knowing the current binding effect.

For example, a plurality of indication portions 2300 are provided on the elastic deformation body 2100 along the longitudinal direction of the elastic deformation body 2100, and different indication portions 2300 correspond to different binding states, and when the second end 2220 of the pointer 2200 moves to the corresponding indication portion 2300, the current binding state can be known.

The pointer 2200 may be provided outside the elastic deformation body 2100, a plurality of indication portions 2300 may be provided in the longitudinal direction of the pointer 2200, different indication portions 2300 may be provided in correspondence with different binding states, the length of the pointer 2200 may be longer than the length of the elastic deformation body 2100, and when the pointer 2200 moves, the other one of the lock mechanism 1000 and the blocking band 3000 may be provided in correspondence with the different indication portion 2300, so that the binding state may be indicated.

The pointer 2200 may be provided with a plurality of indication portions 2300 along the length direction thereof, and the different indication portions 2300 may be associated with different binding states, and the elastic deformation body 2100 may be provided with indication marks, and when the pointer 2200 moves, the indication marks may be associated with the different indication portions 2300, so that the binding states may be indicated.

For example, the elastic deformation body 2100 is made of rubber material, one end is connected to the locking mechanism 1000, and the other end is connected to the blocking band 3000, and the connection may be made in various manners, for example, dissolution, clamping, injection molding, and the like, so long as the elastic deformation body 2100 is not separated from the locking mechanism 1000 and the blocking band 3000 during binding. The first end 2210 of the pointer 2200 is connected to the blocking band 3000, and the second end 2220 of the pointer 2200 is not connected to the locking mechanism 1000, and it is understood that since one of the ends of the elastic deformation body 2100 is connected to the blocking band 3000, it can be considered that the pointer 2200 is connected to the elastic deformation body 2100. When the duodenal ligament is tied, the elastic deformation body 2100 stretches, the pointer 2200 follows the movement, and when the elastic deformation body 2100 contracts, the pointer 2200 also follows the movement. The indication of different binding states/effects can be realized through the arrangement of the indication part 2300, the scheme is simply realized, and the accurate regulation and control of blood flow blocking are ensured.

Optionally, as shown in fig. 4 and 7, in some embodiments of the present utility model, the elastic deformation body 2100 is provided with a cavity 2110 along the length direction thereof, the pointer 2200 is provided in the cavity 2110, and the elastic deformation body 2100 is transparent, so that the indication of different binding states can be more conveniently realized, the indication effect is clear, and the pointer 2200 can be prevented from being disturbed or even damaged during the operation.

Specifically, the elastic deformation body 2100 is provided with a cavity 2110, the cavity 2110 extending along the length direction of the elastic deformation body 2100, for example, the elastic deformation body 2100 is a hollow tube shape prepared from a rubber material, so that the pointer 2200 can be placed in the cavity 2110. When the portal blood flow blocking device binds the duodenal ligament, the elastic deformation body 2100 bends, so that the pointer 2200 is driven to bend synchronously, and the indication of the position can be more accurate. For example, when the elastic deformation body 2100 is provided with the indication portion 2300 and the pointer 2200 is not provided with the indication portion 2300, since the pointer 2200 and the elastic deformation body 2100 are bent in synchronization, the pointer 2200 can be better fitted with the indication portion 2300 when moving. If the pointer 2200 is provided outside the elastic deformation body 2100, the pointer 2200 does not necessarily follow the deformation when the elastic deformation body 2100 is deformed, and the pointer 2200 needs to be manually moved to attach to the elastic deformation body 2100 so that the position between the pointer 2200 and the indication portion 2300 can be known, and the operation is slightly troublesome. In addition, since the pointer 2200 is provided in the elastic deformation body 2100, when the elastic deformation body 2100 is bent, the pointer 2200 does not tilt to affect the relevant tissue of the operation site, and the safety and convenience in use are improved.

It will be appreciated that when the indicator 2300 is positioned in the cavity 2110, with the first end 2210 of the pointer 2200 and one of the locking mechanism 1000 and the blocking band 3000 connected, and the second end 2220 of the pointer 2200 and the other of the locking mechanism 1000 and the blocking band 3000 disconnected, the second end 2220 of the pointer 2200 is positioned between the locking mechanism 1000 and the blocking band 3000, the indicator 2300 may be positioned on the elastic deformation body 2100 or the pointer 2200. Taking the example that the first end 2210 of the pointer 2200 is connected to the blocking band 3000, when the elastic deformation body 2100 is stretched, the second end 2220 is far away from the locking mechanism 1000, when the elastic deformation body 2100 is contracted, the second end 2220 is close to the locking mechanism 1000, the elastic deformation body 2100 is provided with a plurality of indication parts 2300, and at this time, the second end 2220 corresponds to different indication parts 2300 to identify different binding states, thereby providing visual display for doctors.

The indication portion 2300 may be any of a variety of means as long as indication of the relative position of the pointer 2200 can be achieved. For example, the indication portion 2300 may be formed as a protrusion, and may be integrally formed with the pointer 2200 and the elastic deformable body 2100. The indication portion 2300 may be printed with indication marks.

To facilitate the viewing of the relative position of the pointer 2200, the elastic deformation body 2100 is transparent, so that the pointer 2200 can be viewed through the elastic deformation body 2100. For example, an indication scale is printed on the outer surface of the elastic deformation body 2100, and when the elastic deformation body 2100 is deformed, the relative position between the pointer 2200 and the indication scale can be observed through the elastic deformation body 2100, so that a visual indication is provided for adjustment of the binding pressure. It is to be understood that the elastic deformation body 2100 may be made of a transparent material to form a transparent shape, or the elastic deformation body 2100 may be formed to form a transparent shape by showing the position of the pointer 2200 by the light, which is equivalent to forming a transparent shape.

As shown in connection with fig. 1 and 2, in some embodiments of the present utility model, the blocking strap 3000 is provided with ratchet teeth 3210 along its length, the locking mechanism 1000 includes a pawl 1200, the pawl 1200 is configured to be resiliently movable, and the blocking strap 3000 is adapted to pass through the locking mechanism 1000 such that the ratchet teeth 3210 engage the pawl 1200 to effect locking of the blocking strap 3000.

Specifically, the cooperation of the ratchet teeth 3210 and the pawls 1200 can achieve the effect of blocking the unidirectional movement of the belt 3000 while locking in the opposite direction. Since the pawl 1200 is provided to be elastically movable, when the blocking band 3000 is passed through the locking mechanism 1000 to encounter the pawl 1200, the pawl 1200 is elastically deformed to change its position, and when the blocking band 3000 is moved to a proper position, the pawl 1200 is restored to be deformed to be restored, thereby preventing the blocking band 3000 from being separated from the locking mechanism 1000 in the opposite direction.

For example, the ratchet teeth 3210 are right triangle ratchet teeth 3210, and have a guide surface 3211 and an abutment surface 3212, the guide surface 3211 forms an inclined surface, the abutment surface 3212 forms a right angle surface, and when the blocking band 3000 is manually controlled to pass through the lock mechanism 1000, the guide surface 3211 encounters the pawl 1200, and the guide surface 3211 is an inclined surface, so that the pawl 1200 is forced to elastically deform and change position, and the blocking band 3000 can continue to pass through the lock mechanism 1000. When the blocking band 3000 moves in place, the ratchet teeth 3210 no longer promote the elastic deformation of the pawl 1200, and the pawl 1200 returns to its original shape, and at this time, the right-angle surfaces of the ratchet teeth 3210 abut against the pawl 1200, thereby preventing the blocking band 3000 from moving in the opposite direction, and thus locking of the blocking band 3000 is achieved.

Optionally, as shown in connection with fig. 2, the occluding tape 3000 has a first side 3100 and a second side 3200 opposite to each other, the first side 3100 facing the strapping space 4000 when the strapping space 4000 is formed, the second side 3200 facing away from the strapping space 4000, and ratchet teeth 3210 provided on the second side 3200, so that damage to the duodenal ligament when strapping the duodenal ligament can be prevented.

Specifically, since the unidirectional movement and the reverse locking effect are achieved by the cooperation of the ratchet teeth 3210 and the ratchet pawls 1200, adjacent ratchet teeth 3210 are generally spaced apart from each other by a distance of 0.5-2.5mm. When the hepatic portal blood flow blocking device binds the duodenal ligament, certain pressure is formed on the duodenal ligament, if the second side 3200 faces towards the binding space 4000, the pressure formed on the duodenal ligament can be dispersed to each ratchet 3210, tooth marks can be formed on the duodenal ligament, the depth of the tooth marks caused by the ratchet 3210 is larger relative to the joint of the first side 3100 and the duodenal ligament, and the damage to the duodenal ligament is more easily caused, so that the second side 3200 faces away from the binding space 4000, the first side 3100 faces towards the binding space 4000 and is jointed with the duodenal ligament, and the damage to the duodenal ligament is avoided.

As shown in fig. 2 and 6, in some embodiments of the present utility model, the locking mechanism 1000 further includes a pressing handle 1300, one end of the pressing handle 1300 is disposed on the pawl 1200, and the other end of the pressing handle 1300 is suspended and adapted to be pressed to separate the pawl 1200 from the ratchet 3210, so as to achieve unlocking of the blocking band 3000, which is more convenient for unlocking the blocking band 3000.

Specifically, the pressing handle 1300 and the pawl 1200 may be manufactured by integrally molding, so that one end of the pressing handle 1300 is disposed on the pawl 1200, and the other end is suspended. Since the pawl 1200 is configured to be elastically deformed, by providing the pressing handle 1300, the pawl 1200 can be conveniently driven to deform to release the engagement with the ratchet 3210, thereby unlocking the blocking band 3000. During the operation, the laparoscopic forceps can be used to press the pressing handle 1300 to separate the ratchet 3210 from the pawl 1200, and at this time, the blocking band 3000 releases the compression and blocking of the blood vessel under the action of the self tension of the blocking band 3000 or under the pushing of another forceps, thus restoring the blood supply to the liver.

As further shown in fig. 2 and 6, in some embodiments of the present utility model, the locking mechanism 1000 further includes a lock base 1100, the lock base 1100 is provided with a locking space 1110, the locking space 1110 is used for the blocking strap 3000 to pass through, the pawl 1200 extends toward the locking space 1110, and the pressing handle 1300 extends away from the locking space 1110. By the arrangement of the lock housing 1100, the arrangement of the pawl 1200 is facilitated, and the pressing of the handle 1300 to release the engagement of the pawl 1200 and the ratchet 3210 is more conveniently handled.

Specifically, the lock base 1100, the pawl 1200 and the pressing handle 1300 can be manufactured through an integral molding process, and by arranging the lock base 1100, the lock base 1100 carries the pawl 1200 and the pressing handle 1300, so that the integral feeling of the locking mechanism 1000 is better, and when the unlocking operation is performed, the lock base 1100 provides an impetus, and the operation is more convenient.

Since the pawl 1200 extends toward the locking space 1110, it may protrude into the locking space 1110, and thus, the pawl 1200 is encountered when the blocking band 3000 is passed through the locking space 1110, thereby forcing the pawl 1200 to be elastically deformed. When the blocking band 3000 moves to a predetermined position, the tooth space between the adjacent two ratchet teeth 3210 allows the pawl 1200 to be restored and engage with the pawl 1200, thereby stopping the ratchet teeth 3210 in the opposite direction and preventing the blocking band 3000 from moving in the opposite direction. When the blocking band 3000 needs to be released, the forceps can integrally clamp the lock base 1100 and the pressing handle 1300, and the lock base 1100 provides an impetus to conveniently press the pressing handle 1300, so that the operation is more convenient.

Alternatively, as further shown in connection with fig. 2 and 6, in some embodiments of the present utility model, the pressing handle 1300 extends away from the locking space 1110 to a greater extent than the pawl 1200 extends toward the locking space 1110, i.e., the pressing handle 1300 forms a greater moment arm that more easily causes the pawl 1200 to elastically deform out of engagement with the ratchet teeth 3210.

The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the specification and drawings of the present utility model or direct/indirect application in other related technical fields are included in the scope of the present utility model.

Claims (10)

1. The hepatic portal blood flow blocking device is characterized by comprising a locking mechanism, a tension indicating mechanism and a blocking belt, wherein the tension indicating mechanism is connected between the locking mechanism and the blocking belt, and the locking mechanism is suitable for locking the blocking belt to form a binding space and unlocking the blocking belt to release the binding space.

2. The portal blood flow blocking device according to claim 1, wherein the tension indicating mechanism is adapted to elastically deform in its direction of extension under the force.

3. The hepatic portal blood flow blocking device according to claim 1, wherein the tension indicating mechanism includes an elastic deformation body and a pointer, one end of the elastic deformation body is connected to the locking mechanism, the other end of the elastic deformation body is connected to the blocking band, the pointer is connected to one of the locking mechanism and the blocking band and extends toward the other of the locking mechanism and the blocking band, and the elastic deformation body and/or the pointer is provided with an indicating portion.

4. A portal blood flow blocking device as recited in claim 3, wherein the elastic deformation body is provided with a cavity along a length direction thereof, the pointer is provided in the cavity, and the elastic deformation body is transparent.

5. The hepatic portal blood flow blocking device according to claim 3, wherein the indication portion is an indication scale provided on the elastic deformation body.

6. The hepatic portal blood flow blocking device of claim 1, wherein the blocking strap is provided with a ratchet along its length, the locking mechanism comprising a pawl configured to resiliently move, the blocking strap adapted to pass through the locking mechanism to engage the ratchet with the pawl to effect locking of the blocking strap.

7. The portal blood flow blocking device of claim 6, wherein the blocking strap has first and second opposite sides, the first side facing the binding space when the binding space is formed, the second side facing away from the binding space, the ratchet being provided on the second side.

8. The hepatic portal blood flow blocking device of claim 6 wherein the locking mechanism further comprises a pressing handle having one end disposed on the pawl and the other end of the pressing handle suspended and adapted to be pressed to separate the pawl from the ratchet to effect unlocking of the blocking strap.

9. The hepatic portal blood flow blocking device of claim 8, wherein the locking mechanism further comprises a lock seat provided with a locking space for the blocking strap to pass through, the pawl extending toward the locking space, the pressing handle extending away from the locking space.

10. The hepatic portal blood flow blocking device of claim 9, wherein the pressing handle and the pawl form a lever structure, the pawl or the middle of the pressing handle and the pawl is connected with a lock base through a flexible hinge, and the pressing handle extends away from the locking space to a greater extent than the pawl extends toward the locking space.