CN210785934U - Medical drainage support - Google Patents

Abstract

A medical drainage stent comprising: a stent body, and a proximal portion and a distal portion at opposite ends of the stent body for apposition connecting the first tissue wall and the second tissue wall, the stent body being secured between the first tissue wall and the second tissue wall to provide a drainage lumen; the bracket is characterized in that the near end part of the bracket is provided with N extending parts, the fixed ends of the extending parts are fixedly connected with the near end edge of the bracket body, and the other ends of the extending parts are free ends in a free state; at least part of the N extending parts protrudes out of the bracket body in the radial direction, so that the proximal end part of the bracket is fixed to the first tissue wall, wherein N is a positive integer. Based on the design, the problem that the abdominal cavity is easy to fall into when the existing support is released can be effectively solved, and the operation difficulty and the operation risk are effectively reduced.

Description

Medical drainage support

Technical Field

The application relates to the field of medical equipment, in particular to a medical drainage support.

Background

Along with the development of scope and ultrasonic endoscope, the metal support of putting under the scope is used for the drainage technique of inosculating between the tissue to obtain corresponding development, for example pancreas cyst drainage, stomach jejunostomy, the gall-bladder is got stone etc. but need the exquisite skill of doctor when implanting about this kind of support at present, the operation is accurate, if not accurate enough when the release, then the risk that the abdominal cavity can be fallen into to the support, can greatly increased operation degree of difficulty, this kind of support is not convenient for retrieve to specific support and retrieves official cavity after the drainage is accomplished at present simultaneously, consequently the research more be convenient for the metal support of operation and drainage between the tissue become urgent of affairs, also possess important clinical meaning.

The current existing anastomosis drainage stent in the market is used for performing, for example, gastrointestinal anastomosis, like the prior art CN204170264U, a biliary pancreas stent is disclosed, the structure of the biliary pancreas stent is an integral hollow structure woven by metal wires, the connection stability degree of the stent in use can be effectively enhanced, and the biliary pancreas stent can be used for fistulization, drainage and establishment of an operation channel between two hollow organs. However, this configuration may result in the stent falling into the abdominal cavity with little carelessness in releasing the stent, and the flange structure of the existing stent is very inconvenient to retrieve after the stent falls into the abdominal cavity, greatly increasing the difficulty and risk of the operation.

SUMMERY OF THE UTILITY MODEL

The utility model provides a medical drainage support to solve prior art release support and can lead to the support to fall into the abdominal cavity and the complicated problem of support manufacturing process carelessly a little. The utility model provides a stent, its near-end possesses the regulation and control nature of drainage section position when an extension can guarantee the release of stent, has reduced the risk in the operation to a certain extent, effectively solves the problem that falls into the abdominal cavity easily when current stent releases, effectively reduces the operation degree of difficulty and operation risk, and the extension possesses certain pull-off power simultaneously, can play the effect of fixed bolster to this stent adopts the good wire of biocompatibility to weave (like nickel titanium memory alloy silk), and simple manufacture process is feasible.

Additionally, the utility model provides a medical drainage support through the flexible portion that sets up on the support body, can adapt to not unidimensional operation for drainage section position's regulation and control nature when can guarantee the support release during the operation falls into abdominal cavity's problem easily when effectively solving current support release, reduces the operation degree of difficulty.

The embodiment of the utility model discloses a realize through following mode:

a medical drainage stent comprising: a stent body, and a proximal portion and a distal portion at opposite ends of the stent body for apposition connecting the first tissue wall and the second tissue wall, the stent body being secured between the first tissue wall and the second tissue wall to provide a drainage lumen; the bracket comprises a bracket body, a bracket body and N extending parts, wherein the near end part of the bracket is provided with N extending parts, the fixed ends of the extending parts are fixedly connected with the near end edge of the bracket body, and the other ends of the extending parts are free ends in a free state; at least part of the N extending parts protrudes out of the bracket body in the radial direction, so that the proximal end part of the bracket is fixed to the first tissue wall, wherein N is a positive integer.

Through setting up the extension that extends to the near-end by the support body, can make when the support releases in the anastomotic tissue of near-end body is enough long, be difficult for falling into the abdominal cavity, security when guaranteeing the support release can be with two organ tissue walls mutual support connection simultaneously, prevent that drainage chamber from taking off by pulling.

Preferably, the extension part is an arc-shaped tube spirally extending along the edge of the near end of the bracket body, the fixed end of the arc-shaped tube is fixed at the edge of the near end of the bracket body, and the other end of the arc-shaped tube is a free end in a free state; the partial structure of the arc-shaped tube protrudes out of the stent body in the radial direction, so that the proximal end portion of the stent is fixed to the first tissue wall. The arc-shaped tube spirally extending along the edge of the proximal end of the stent body ensures that the stent does not damage the technical effect of the tissue wall when being supported on the tissue wall on the basis of ensuring enough pull-off force with the tissue wall.

Preferably, the extension part extends outwards along the radial direction of the bracket body, the fixed end of the extension part is fixed at the edge of the proximal end of the bracket body, and the other end of the extension part is a free end in a free state. Through one end fixation, one end is the structural design of free state, has improved the flexibility of support greatly, has improved the area of contact with the tissue wall on the one hand, promotes the tensile and takes off the performance, and on the one hand, the free end of extension effectively prevents that the support from droing, also is convenient for retrieve.

Preferably, the extending parts are uniformly distributed at the edge of the near end of the bracket body, the included angle between every two adjacent extending parts is 360/N degrees, and N is a positive integer of 2-4. The grasping strength of the proximal portion and the tissue wall can be effectively improved by using a plurality of extensions.

Preferably, the free end of the extension is provided with a fixing structure to realize the fastening connection of the free end and the first tissue wall, wherein the fixing structure is fixedly or non-fixedly connected with the free end, and the supporting force of the fixing structure is larger than that of the extension.

Preferably, the stent further comprises at least one of the following structures:

(1) the proximal end part and/or the distal end part of the bracket are/is provided with a recovery wire;

(2) and a developing piece is arranged on the bracket to display the position of the bracket under rays.

The utility model also provides a medical drainage support, include: a stent body, and a proximal portion and a distal portion at opposite ends of the stent body for apposition connecting the first tissue wall and the second tissue wall, the stent body being secured between the first tissue wall and the second tissue wall to provide a drainage lumen; the bracket body is provided with a flexible part with a supporting force smaller than that of the proximal part and the distal part, and the flexible part can form an inner recess with a reduced inner diameter after being pressed, so that partial structures of the proximal part and the distal part of the bracket protrude out of the bracket body, the proximal part of the bracket is fixed on the first tissue wall, and the distal part of the bracket is fixed on the second tissue wall. Through the design that directly sets up flexible portion on the support body, very big simplification the supporting structure, flexible portion can effectively reduce the stimulation to the tissue, possesses the function of juxtaposition tissue simultaneously again, and the flexible indent structure of support compares with design such as conventional mushroom head, umbelliform turn-up simultaneously, and compressible entering is thinner puts into ware, but the thinner scope pincers way of adaptation clinically.

Preferably, the stent body is provided with more than 2 flexible parts extending along the axial direction of the stent body, and the flexible parts are distributed at equal intervals along the circumferential direction of the stent body.

Preferably, the flexible part covers a partial area of the stent body, and the supporting force of the rest area of the stent body is larger than that of the flexible part. Wherein, flexible portion can be polymer elastic membrane, perhaps the silk thread of polymer material weaves the grid structure that forms, and flexible portion whole holding power is less than other regions of support body, and then when realizing juxtaposing different organ tissue walls, only flexible portion indent, and the tissue wall block is in indent edge, realizes the support to the juxtaposition connection of different tissue walls.

Preferably, the proximal end portion and the distal end portion of the stent are provided with fixing structures at positions protruding from the stent body. Can ensure that the apposition effect of the bracket and the tissue wall is better

Preferably, the stent further comprises at least one of the following structures:

(1) the proximal end part and/or the distal end part of the bracket are/is provided with a recovery wire;

(2) and a developing piece is arranged on the bracket to display the position of the bracket under rays.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.

Fig. 1 is a side view of a bracket according to embodiment 1 of the present invention;

fig. 2 is a top view of a bracket according to embodiment 1 of the present invention;

fig. 3 is a plan view of a bracket according to embodiment 2 of the present invention;

fig. 4 is a side view of a bracket according to embodiment 3 of the present invention;

FIG. 5 is a side view of a stent apposed to a tissue wall in accordance with example 3 of the present invention;

fig. 6 is a side view of a bracket according to embodiment 4 of the present invention;

fig. 7 is a schematic view showing different states of the fixing structure in the stent of embodiment 4 of the present invention when the fixing structure is implanted into an organ;

fig. 8 is a side view of a bracket according to embodiment 5 of the present invention;

fig. 9 is a front view of a flexible part of a bracket according to embodiment 5 of the present invention;

fig. 10 is a top view of a bracket according to embodiment 5 of the present invention;

figure 11 is a side view of a stent apposed to a tissue wall according to example 5 of the present invention.

Fig. 12 is a side view of a bracket according to embodiment 6 of the present invention;

fig. 13 is a top view of a bracket according to embodiment 6 of the present invention;

fig. 14 is a side view of a bracket according to embodiment 7 of the present invention;

fig. 15 is a perspective view of a bracket according to embodiment 8 of the present invention;

fig. 16 is a radial cross-sectional view of a stent in embodiment 8 of the present invention;

fig. 17 is a radial cross-sectional view of a stent in embodiment 9 of the present invention;

wherein:

1-a stent body; 2-a proximal end of the stent; 3-a distal stent portion; 4-a recovery line; 5-a drainage cavity of the stent body; 6-a first tissue wall; 7-a second tissue wall; 8-a fixed structure; 9-an extension; 91-free end; 92-a fixed end; 10-a flexible portion; 11-wire braiding angle.

Detailed Description

The technical solution in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.

One, the utility model discloses conventional concept explanation

1. The utility model discloses well support belongs to the formula support that expands certainly.

2. The utility model can form anastomotic stoma between any two adjacent organs in the stomach, small intestine (duodenum, control field, ileum) and large intestine (cecum, colon), rectum, biliary tract structure or esophagus. The stent can form a passage between the first tissue wall and the second tissue wall of the two organs respectively, and promote the flow of different types of fluids, such as undigested, partially or completely digested food, through a drainage lumen inside the stent.

3. The utility model discloses well support can be woven by the silk thread that metal or alloy material that arbitrary is fit for the internal application of human body made and form, preferably weaves by nickel titanium memory alloy silk thread and forms, has network structure.

4. The utility model discloses the proximal end portion of well support has recovery line 4, can be used to adjust the relative position of the drainage chamber 5 of support inside and the first tissue wall 6 of adjacent two organs in the human body, second tissue wall 7, also can realize the recovery of support.

5. The utility model discloses well whole support is with membrane structure for prevent that drainage material from revealing from the support mesh, can prevent simultaneously that the granulation from growing so that the later stage of support is retrieved.

6. The utility model discloses well distal end portion can be for the limit turn-up structure that outwards overturns and curl the back and form, or mushroom head structure, or the outstanding structure with organizing the wall joint of arbitrary conventionality such as umbelliform flange structure.

7. The proximal end part and the distal end part of the stent of the utility model can be connected with the tissue walls of two different organs in parallel so as to connect different organs, and the stent body forms a drainage cavity therein; wherein, the near-end in the utility model refers to the one end that is close to the operator, and the distal end refers to the one end of keeping away from the operator.

8. The utility model discloses well axial direction indicates along support body axis of ordinates direction extending direction, and radial direction indicates the extending direction of perpendicular to support body axis of ordinates, and the support is inside to indicate the inner space that is surrounded by the support body, and the support outside indicates the support body pipe wall outside space relative with the support is inside.

Second, the utility model discloses a detailed implementation mode of supporting structure

Example 1

The medical drainage stent shown in fig. 1-2 comprises: a stent body 1, a proximal end part 2 and a distal end part 3 which are positioned at two ends of the stent body 1 so as to realize the juxtaposition and connection of a first tissue wall and a second tissue wall, wherein the stent body 1 is fixed between the first tissue wall and the second tissue wall to provide a drainage cavity; the proximal end part 2 of the bracket is provided with 2 extending parts 9, the fixed end 92 of each extending part 9 is fixedly connected with the proximal edge of the bracket body 1, and the other end of each extending part 9 is a free end 91 in a free state; the 2 extensions 9 are substantially configured as a ring around the proximal edge of the stent body 1, and the overall outer diameter of the ring formed by the two extensions is larger than the outer diameter of the stent body, so that the proximal end of the stent is fixed to the first tissue wall. In this embodiment, the extension portion 9 is a circular arc tube spirally extending along the proximal edge of the stent body 1, a fixed end 92 of the circular arc tube is fixed to the proximal edge of the stent body 1, and the other end is a free end 91 in a free state; the partial structure of the arc tube protrudes from the stent body 1 in the radial direction, so that the proximal end part 2 of the stent is fixed on the first tissue wall. In addition, in order to obtain a better pulling-off force, prevent the stent from falling off in use and make the stent more easily pulled off in pulling-off, it is preferable that the extension portion 9 is fixedly connected to the proximal end edge of the stent body 1 from the fixed end thereof along a partial region (1/3 occupying at least the total length of the circular arc tube) in the spiral direction, so that the connection strength between the extension portion and the stent body is enhanced and the deformation resistance of the stent is improved. In addition, the design of the arc-shaped circular tube of the extension part reduces the stimulation effect of the bracket on the tissue wall, the pull-off process has less harm to the human body, and meanwhile, the tube-shaped design has a good supporting effect, so that the firm connection between the proximal end part of the bracket and the tissue wall can be ensured, and the stability of the bracket in the drainage process is ensured.

In order to fixedly clamp the distal end of the stent with the second tissue wall 7, the distal end part 3 of the stent has a curled flange structure, and the outer diameter of the flange is preferably more than 1.2 times of the outer diameter of the stent body 1, so that the distal end of the stent has enough anti-pulling performance, and the stent is prevented from being pulled off and falling into the abdominal cavity in the using process. Meanwhile, the stent in the embodiment is attached with a membrane structure, and the membrane structure can be made of high polymer materials with good biocompatibility, such as a PTFE membrane, a silica gel membrane and the like. The stent proximal portion 2 is provided with a recovery wire 4, the recovery wire 4 can be directly connected to an extension portion 9 of the stent proximal portion 2, and can also be connected to the edge of the proximal end of the stent drainage channel 5, so that the stent can be dragged out of the body cavity; the recycling line 4 can be made of high molecular materials with good biocompatibility, such as PP lines and PE lines; in order to ensure that the recovery wire can effectively pull out the stent, the breaking force of the recovery wire 4 in this embodiment is preferably 10N or more. The support is provided with a display to show the position of the support under radiation, preferably a tantalum marker that can be positioned under X-ray. In this embodiment, the extension 9 is a semi-circular arc-shaped annular structure with two free ends and two fixed ends, which are symmetrically arranged with respect to the center of the cross section of the stent body, and the annular structure can also be replaced by a tubular arc-shaped structure with three or four fixed ends and four fixed ends, which are sequentially adjacent to each other and have the same length and the same interlayer spacing, so that the effective fixation to the tissue wall can be realized.

The specific operation of the bracket in the use process is as follows: conveying the stent to two organs to be juxtaposed by a stent conveying device; the distal end portion 3 of the stent is fitted to the distal side of the second tissue wall 7 of the distal organ at the time of initial release of the stent; gradually releasing the stent until the stent is completely released, and ensuring that the proximal end part 2 of the stent is attached to the proximal side of the first tissue wall 6 of the proximal organ, namely completing the whole releasing process of the stent, and achieving the purpose that the first tissue wall 6 and the second tissue wall 7 form a communication passage through a drainage cavity in the stent.

Example 2

In the medical drainage stent shown in fig. 3, on the basis of the embodiment 1, 1 extension part is replaced by 2 extension parts in the embodiment 1. Namely, the medical drainage stent in the embodiment 2 includes: a stent body 1, a proximal end part 2 and a distal end part 3 which are positioned at two ends of the stent body 1 so as to realize the juxtaposition and connection of a first tissue wall and a second tissue wall, wherein the stent body 1 is fixed between the first tissue wall and the second tissue wall to provide a drainage cavity; the proximal end part 2 of the bracket is provided with 1 extending part 9, the fixed end 92 of the extending part 9 is fixedly connected with the proximal end edge of the bracket body 1, and the other end of the extending part 9 is a free end 91 in a free state; in this embodiment, the extension portion 9 is 1 circular arc tube spirally extending nearly 360 degrees along the proximal edge of the stent body 1, a fixed end 92 of the circular arc tube is fixed to the proximal edge of the stent body 1, the other end of the circular arc tube is a free end 91 in a free state, and a partial structure of the circular arc tube protrudes from the stent body 1 in the radial direction, so that the proximal portion 2 of the stent is fixed to the first tissue wall. In addition, in order to obtain better pulling-out force and prevent the stent from falling off in use, the stent is easier to pull out in pulling-out, the extension part 9 consisting of 1 circular arc tube is fixedly connected with the near-end edge of the stent body 1 from the fixed end 92 along the partial region (at least 1/3 which occupies the total length of the circular arc tube) of the spiral direction, so that the connection strength of the extension part and the stent body is enhanced, and the deformation resistance of the stent is improved.

Example 3

The medical drainage stent shown in fig. 4-5 comprises: a stent body 1, and an extension 9 and a distal portion 3 at a proximal end of said stent body 1 for apposition joining a first tissue wall and a second tissue wall, said stent body 1 being secured between a first tissue wall 6 and a second tissue wall 7 to provide a drainage lumen; wherein, the support proximal end has 2 extension 9, extension 9's stiff end 92 and support body 1 near-end edge fixed connection, extension 9's the other end is the free end 91 that is free state, the extension radially outwards extends along support body 1, and its stiff end 92 is fixed in support body 1 near-end edge, and the other end is the free end 91 that is free state. Through one end fixed, one end is free state's structural design, has improved the flexibility of support greatly, has improved the area of contact with organizing the wall on the one hand, promotes the tensile and takes off the performance, and on the one hand, the free end 91 of extension effectively prevents that the support from droing, also is convenient for retrieve.

In this embodiment, the fixing structure 8 is preferably adopted to fix and clamp the free end of the extension portion 9 to the first tissue wall, so as to greatly improve the connection strength of the stent for connecting the tissue walls of the two organs in parallel and improve the stability and reliability of the operation, wherein the fixing structure 8 is a single structure and is applied to the position to be connected through other surgical instruments. In addition, in order to improve the connection stability of the free end 91 and the tissue wall, the supporting force of the fixing structure 8 is preferably larger than that of the extension portion 9, and the fixing structure may be a conventional fastening structure such as a hemostatic clamp or an anastomosis clamp.

Example 4

Referring to fig. 6-7, in example 3, the medical drainage stent of example 3 is replaced by a flying wing structure directly and fixedly connected with an extension part 9, wherein the fixed structure 8 (such as a hemostatic clamp) fixedly connected with the extension part in example 3 is replaced by the flying wing structure. That is, the medical drainage stent in this embodiment includes: a stent body 1, and an extension 9 and a distal portion 3 at a proximal end of said stent body 1 for apposition joining a first tissue wall and a second tissue wall, said stent body 1 being secured between a first tissue wall 6 and a second tissue wall 7 to provide a drainage lumen; wherein, the support proximal end has 2 extension 9, extension 9's stiff end 92 and support body 1 near-end edge fixed connection, extension 9's the other end is the free end 91 that is free state, the extension radially outwards extends along support body 1, and its stiff end 92 is fixed in support body 1 near-end edge, and the other end is the free end 91 that is free state.

As shown in fig. 6, the free end 91 has a wing-shaped fastening structure 8 extending therefrom, i.e. extending along the inner tube of the tubular extension 9 towards the free end 91 and extending from the mouth of the free end 91 and diverging radially outwards. The winged fixing structure 8 can be specifically shown in fig. 7, a main body of the winged fixing structure 8 is a smooth and flexible hollow or solid tube, one end of the fixing structure 8 extending out of the free end 91 of the extending portion 9 is provided with a wing-shaped structure, one end with the wing-shaped structure is plugged into the tubular structure of the extending portion 9 in the using process, the wing-shaped structure is pressed by the tube wall of the extending portion 10 and yields (as shown in the lower drawing of fig. 7), and the wing-shaped structure is unfolded based on the memory effect of the material of the wing-shaped structure after being pushed to extend out of the free end 91 of the wing-shaped structure, so that the fastening with the tissue wall is realized. Wherein the fixed structure 8 can be made of nickel-iron memory alloy wires or silica gel elastomers.

Example 5

A medical drainage stent as shown in fig. 8-11, comprising: the stent comprises a stent body 1, a proximal end part 2 and a distal end part 3 which are positioned at two ends of the stent body 1 so as to realize juxtaposition and connection of a first tissue wall 6 and a second tissue wall 7, wherein the stent body 1 is fixed between the first tissue wall 6 and the second tissue wall 7 to provide a drainage cavity 5, the proximal end and the distal end of the stent are both provided with a recovery wire 4, and the recovery wire 4 at the distal end can be dragged from the inside of the drainage cavity 5 in the operation process, so that the distal end opening is tightened and the human body is dragged out, the friction between the recovery wire and the human body tissue can be effectively reduced in the process, and the use safety of the stent is improved. The stent body 1 is provided with an elongated flexible part 10 extending along the axial direction of the stent body, the supporting force of the flexible part 1 is smaller than that of the proximal part and the distal part of the stent, and the flexible part 10 can form an indent with a reduced inner diameter after being pressed, so that partial structures of the proximal part 2 and the distal part 3 of the stent protrude out of the stent body 1, the proximal part 2 of the stent is fixed on the first tissue wall 6, and the distal part 3 of the stent is fixed on the second tissue wall 7. Through the design that directly sets up flexible portion 10 on support body 1, very big simplification the supporting structure, flexible portion 10 can effectively reduce to the tissue stimulation, possesses the function of juxtaposition tissue simultaneously again, and the flexible indent structure of support compares with design such as conventional mushroom head, umbelliform turn-up simultaneously, and compressible entering is thinner to put into ware, but the thinner scope pincers way of adaptation clinically. In this embodiment, the flexible portion 10 is preferably formed by weaving a filament yarn formed by a polymer material, has a better flexibility, is more easily deformed than other portions of the stent body 1, and has a smaller supporting force, so that the stent can be radially collapsed and concaved when being compressed by the tissue portion, and the two tissue walls are connected together in a juxtaposed manner.

In this embodiment, the two ends of the stent are formed by axially extending the stent body 1 to the proximal end and the distal end to form an integrated structure, and the stent body 1 is woven by silk thread material with deformation resistance superior to that of the flexible portion 10. In addition, as shown in fig. 10, as seen from the top view of the stent, the end portions of the stent have wire weaving angles 11 which radially shrink towards the longitudinal axis of the stent along the circumferential direction, and by forming the radially shrinking nozzle structures at the two end portions of the stent, when the stent is released on the tissue walls of two adjacent organs, the contact area between the edge of the end portion of the stent and the tissues can be reduced, and the stimulation to the tissue wall surfaces can be effectively avoided.

Example 6

As shown in fig. 12 to 13, in the embodiment 5, the fixing structures 8 are respectively provided at the distal and proximal ends of the flexible portion 10. That is, the medical drainage stent in this embodiment includes: a stent body 1, a proximal end part 2 and a distal end part 3 which are positioned at two ends of the stent body 1 so as to realize the juxtaposition and connection of a first tissue wall 6 and a second tissue wall 7, wherein the stent body 1 is fixed between the first tissue wall 6 and the second tissue wall 7 so as to provide a drainage cavity 5, and a recovery wire 4 is arranged at the proximal end of the stent; the stent body 1 is provided with a flexible part 10 with a supporting force smaller than that of the proximal part and the distal part, and the flexible part 10 can form an inner recess with a reduced inner diameter after being pressed, so that partial structures of the proximal part 2 and the distal part 3 of the stent protrude out of the stent body 1, the proximal part 2 of the stent is fixed on the first tissue wall 6, and the distal part 3 of the stent is fixed on the second tissue wall 7.

As shown in fig. 13, in this embodiment, two flying wing shaped fixing structures 8 are respectively fixedly connected to the far and near ends of the flexible portion 10 for improving the supporting force of the entire stent and ensuring that the stent will not be pulled out and fall into the body during use, the flying wing shaped fixing structures 8 can be formed by sizing a nickel titanium wire, the end portion of the stent is accommodated in the stent body in a state of waiting to be released, when the end portion of the stent is released, the end portion is released and extended from the stent body to the outer side of the stent body based on the self shape memory characteristic and forms an arc-shaped extending structure protruding from the stent body in the radial direction in fig. 13, and the supporting force of the flying wing shaped fixing structures 8 is greater than the supporting force of the flexible portion 10 of the stent, so as to ensure that the two tissue walls of the.

Example 7

As shown in fig. 14, in addition to example 5, two elongated flexible portions 10 extending in the axial direction of the stent body are axially symmetrically provided on the stent body, and the polymer yarn woven structure of the flexible portions 10 is replaced with a polymer film structure. That is, the medical drainage stent in this embodiment includes: a stent body 1, a proximal end part 2 and a distal end part 3 which are positioned at two ends of the stent body 1 so as to realize the juxtaposition and connection of a first tissue wall 6 and a second tissue wall 7, wherein the stent body 1 is fixed between the first tissue wall 6 and the second tissue wall 7 so as to provide a drainage cavity 5, and a recovery wire 4 is arranged at the proximal end of the stent; the stent body 1 is provided with two axially symmetrical elongated flexible portions 10 extending along the axial direction of the stent body, the supporting force of the flexible portions 10 is smaller than that of the proximal portion and the distal portion of the stent, and the flexible portions 10 can form an indent with a reduced inner diameter after being pressed, so that partial structures of the proximal portion 2 and the distal portion 3 of the stent protrude out of the stent body 1, the proximal portion 2 of the stent is fixed to the first tissue wall 6, and the distal portion 3 of the stent is fixed to the second tissue wall 7.

In this embodiment, the flexible portion 10 is preferably a membrane structure formed by a polymer material, the polymer membrane has better flexibility, is easier to deform than other portions of the stent body 1, and has smaller supporting force, so that the stent can collapse inwards in the radial direction when the tissue portion is compressed, two tissue walls are connected together in parallel by the stent, and the polymer membrane can be made of any polymer material suitable for a human body, so that the requirements of the application environment can be met.

Example 8

As shown in fig. 15 to 16, in example 7, three elongated flexible portions 10 extending in the axial direction of the stent body are provided at equal intervals on the stent body. That is, the medical drainage stent in this embodiment includes: a stent body 1, a proximal end part 2 and a distal end part 3 which are positioned at two ends of the stent body 1 so as to realize the juxtaposition and connection of a first tissue wall 6 and a second tissue wall 7, wherein the stent body 1 is fixed between the first tissue wall 6 and the second tissue wall 7 so as to provide a drainage cavity 5, and a recovery wire 4 is arranged at the proximal end of the stent; the three elongated flexible parts 10 extending axially along the stent body are arranged at equal intervals on the stent body, the supporting force of the flexible parts 10 is smaller than that of the proximal part and the distal part of the stent, and the flexible parts 10 can form an indent with a reduced inner diameter after being pressed, so that partial structures of the proximal part 2 and the distal part 3 of the stent protrude out of the stent body 1, the proximal part 2 of the stent is fixed on the first tissue wall 6, and the distal part 3 of the stent is fixed on the second tissue wall 7.

As can be seen from the radial cross-sectional view of the stent shown in fig. 16, three strip-shaped flexible portions 10 extending along the axial direction of the stent body are arranged at equal intervals on the stent body, the three flexible portions 10 are distributed on the outer circumference of the stent body 1 at equal intervals, the arc curvature of the flexible portion structure is larger than that of the stent body, so that an arc-shaped cylinder structure protruding out of the outer wall of the stent body is formed, the contact area between the flexible portions 10 and the tissue wall can be increased through the special-shaped cylinder structure, the area of the clamping and fixing structure between the two ends of the stent and the tissue wall is increased, and the anti-pulling performance of the stent is improved. Of course, the flexible part can be increased or decreased according to the actual treatment position difference, and the number of the arc-shaped column structures with the flexible parts 10 is preferably 2-6.

Example 9

As shown in fig. 17, in example 7, the radial section of the stent body is nearly rectangular, and the flexible portions are symmetrically arranged at the short sides. That is, the medical drainage stent in this embodiment includes: a stent body 1, a proximal end part 2 and a distal end part 3 which are positioned at two ends of the stent body 1 so as to realize the juxtaposition and connection of a first tissue wall 6 and a second tissue wall 7, wherein the stent body 1 is fixed between the first tissue wall 6 and the second tissue wall 7 so as to provide a drainage cavity 5, and a recovery wire 4 is arranged at the proximal end of the stent; the stent body 1 is provided with two axially symmetrical elongated flexible portions 10 extending along the axial direction of the stent body, the supporting force of the flexible portions 10 is smaller than that of the proximal portion and the distal portion of the stent, and the flexible portions 10 can form an indent with a reduced inner diameter after being pressed, so that partial structures of the proximal portion 2 and the distal portion 3 of the stent protrude out of the stent body 1, the proximal portion 2 of the stent is fixed to the first tissue wall 6, and the distal portion 3 of the stent is fixed to the second tissue wall 7.

As can be seen from the radial section view of the stent shown in FIG. 17, the flexible parts 10 are axially symmetrically arranged at both sides of the stent body 1, the radial section is nearly rectangular, the flexible parts 10 are arranged at the short sides, and the long sides of the rectangle have a certain radian so as to reduce the injury to the human tissues. Through set up flexible portion 10 at the minor face, on the basis of guaranteeing the joint intensity of support and tissue wall, can effectively ensure the holistic anti deformability of support, further ensure the support and resist tensile and take off the ability.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (11)

1. A medical drainage stent comprising:

a stent body, and a proximal portion and a distal portion at opposite ends of the stent body for apposition connecting the first tissue wall and the second tissue wall, the stent body being secured between the first tissue wall and the second tissue wall to provide a drainage lumen;

the method is characterized in that:

the bracket is characterized in that the near end part of the bracket is provided with N extending parts, the fixed ends of the extending parts are fixedly connected with the near end edge of the bracket body, and the other ends of the extending parts are free ends in a free state;

at least part of the N extending parts protrudes out of the bracket body in the radial direction, so that the proximal end part of the bracket is fixed to the first tissue wall, wherein N is a positive integer.

2. The medical drainage stent of claim 1, wherein:

the extension part is an arc-shaped pipe spirally extending along the edge of the near end of the bracket body, the fixed end of the arc-shaped pipe is fixed at the edge of the near end of the bracket body, and the other end of the arc-shaped pipe is a free end in a free state; the partial structure of the arc-shaped tube protrudes out of the stent body in the radial direction, so that the proximal end portion of the stent is fixed to the first tissue wall.

3. The medical drainage stent of claim 1, wherein:

the extension part extends outwards along the radial direction of the bracket body, the fixed end of the extension part is fixed at the edge of the near end of the bracket body, and the other end of the extension part is a free end in a free state.

4. The medical drainage stent of any one of claims 1 to 3, wherein:

the extending parts are evenly distributed at the edge of the near end of the bracket body, the included angle between every two adjacent extending parts is 360/N degrees, and N is a positive integer of 2-4.

5. The medical drainage stent of any one of claims 1 to 3, wherein:

the free end of the extension part is provided with a fixing structure so as to realize the fastening connection of the free end and the first tissue wall, wherein the fixing structure is fixedly or non-fixedly connected with the free end, and the supporting force of the fixing structure is larger than that of the extension part.

6. The medical drainage stent of any one of claims 1 to 3, wherein:

the stent further comprises at least one of the following structures:

(1) the proximal end part and/or the distal end part of the bracket are/is provided with a recovery wire;

(2) and a developing piece is arranged on the bracket to display the position of the bracket under rays.

7. A medical drainage stent comprising:

a stent body, and a proximal portion and a distal portion at opposite ends of the stent body for apposition connecting the first tissue wall and the second tissue wall, the stent body being secured between the first tissue wall and the second tissue wall to provide a drainage lumen;

the method is characterized in that:

the bracket body is provided with a flexible part with a supporting force smaller than that of the proximal part and the distal part, and the flexible part can form an inner recess with a reduced inner diameter after being pressed, so that partial structures of the proximal part and the distal part of the bracket protrude out of the bracket body, the proximal part of the bracket is fixed on the first tissue wall, and the distal part of the bracket is fixed on the second tissue wall.

8. The medical drainage stent of claim 7, wherein:

the support body is provided with more than 2 flexible parts extending along the axial direction of the support body, and the flexible parts are distributed at equal intervals along the circumferential direction of the support body.

9. The medical drainage stent of claim 7, wherein:

the flexible part covers partial area of the bracket body, and the supporting force of the rest area of the bracket body is larger than that of the flexible part.

10. The medical drainage stent of any one of claims 7 to 9, wherein:

the proximal and distal portions of the stent have fixation structures protruding out of the stent body.

11. The medical drainage stent of any one of claims 7 to 9, wherein:

the stent further comprises at least one of the following structures:

(1) the proximal end part and/or the distal end part of the bracket are/is provided with a recovery wire;

(2) and a developing piece is arranged on the bracket to display the position of the bracket under rays.

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