Percutaneous improved fistulization tube under gastroscope

Abstract

The percutaneous improved fistulization tube under the gastroscope comprises a catheter, an inner fixing piece and an outer sleeve, and the far end of the catheter is provided with a first connector and a second connector; the inner fixing piece is made of a deformable plastic material and is sleeved outside the guide pipe; the outer sleeve sleeves the catheter and can slide between a first position and a second position relative to the catheter; wherein the inner fixing part is constructed to be of a compressible structure in the axial direction, when the outer sleeve is located at the first position, the inner fixing part is in a natural state and forms a cylindrical structure, and when the outer sleeve slides to the second position from the first position, one end of the outer sleeve extrudes the inner fixing part, so that the inner fixing part is switched to be in a compressed state and forms an umbrella-shaped structure. According to the fistulization tube, the fixing effect is guaranteed, meanwhile, operation safety and operation convenience are remarkably improved, and the fistulization tube is particularly suitable for infant patients to use.

Description

TECHNICAL FIELD

[0001] The utility model relates to a fistula tube, especially to a percutaneous improved fistula tube under gastroscope. BACKGROUND

[0002] The percutaneous puncture gastrostomy operation is a kind of operation that directly enters stomach to make fistula through skin, and is suitable for the patient with long-term swallowing disorder but normal gastrointestinal function.

[0003] The gastrostomy tube includes a catheter, and the proximal end (the end into the stomach) of the catheter is provided with an internal fixing part for stopping on the stomach wall to prevent it from coming out of the stomach. The internal fixing part of the current gastrostomy tube is a disc-shaped structure and is made of hard plastic. The inventor found in clinical work that for infants received by maternal and child hospitals, the hard disc-shaped structure is extremely unfriendly to infants when performing gastrostomy, has large size, is difficult to pass, and it is difficult to reach the stomach through the throat and esophagus, and the catheter is prone to tissue damage and other problems. SUMMARY

[0004] The utility model aims at at least one of the technical problems in the related art to some extent. Therefore, the purpose of the utility model is to provide a percutaneous improved fistula tube under gastroscope.

[0005] To achieve the above-mentioned purpose, according to the percutaneous improved fistula tube under gastroscope of the utility model embodiment, comprising:

[0006] A catheter, the distal end of the catheter has a first interface and a second interface;

[0007] An internal fixing part, the internal fixing part is made of deformable plastic material and is sleeved on the catheter;

[0008] An outer sleeve, the outer sleeve is sleeved on the catheter and is slidable relative to the catheter between a first position and a second position;The lower end of the outer sleeve is connected with the internal fixing part;

[0009] Wherein, the internal fixing part is configured as an axial compressible structure, when the outer sleeve is located at the first position, the internal fixing part is in a natural state and forms a cylindrical structure, when the outer sleeve slides from the first position to the second position, one end of the outer sleeve extrudes the internal fixing part, so that the internal fixing part switches to a compressed state and forms an umbrella-shaped structure.

[0010] According to the gastroscopy percutaneous modified fistula tube, the inner fixing part is made of deformable plastic material, and a compressible structure is designed, and the state conversion of the inner fixing part is realized by cooperation of the slidable outer sleeve. Specifically, when the outer sleeve is located at the first position, the inner fixing part is in a natural state of a columnar cylinder, and the structure has a small radial dimension, and the passage resistance of the catheter in the throat, esophagus and other parts of the infant is significantly reduced; when the catheter reaches the target position, the outer sleeve is slid to the second position, and the extrusion effect of the end of the outer sleeve is used to compress and deform the inner fixing part from the columnar cylinder to the umbrella structure, so that the stopping effect in the stomach is realized. The deformable design not only solves the problem of too large size and difficult passage of the traditional hard disc-shaped inner fixing part, but also greatly reduces the damage risk to the infant tissue due to the use of deformable plastic material. The gastroscopy percutaneous modified fistula tube can ensure the fixing effect, significantly improve the operation safety and operation convenience, and is especially suitable for infant patients, and has important clinical application value.

[0011] In addition, the gastroscopy percutaneous modified fistula tube according to the above-mentioned embodiments of the utility model can also have the following additional technical features:

[0012] According to one embodiment of the utility model, the inner fixing part includes a fixed ring, a sliding ring and a sleeve, the fixed ring is fixed at the proximal end of the catheter, the sliding ring is slidably sleeved on the catheter, and the sleeve is sleeved outside the catheter, one end of the sleeve is connected with the fixed ring, and the other end of the sleeve is connected with the sliding ring.

[0013] When one end of the outer sleeve pushes the sliding ring to slide to the proximal end of the catheter, the inner fixing part is compressed to form an umbrella structure.

[0014] According to one embodiment of the utility model, the sleeve includes an upper part, a lower part and a connecting part connected between the upper part and the lower part.

[0015] When the outer sleeve slides to the second position, the upper part is in a horizontal state, the lower part is in an inclined state, and the upper part and the lower part combine to form the umbrella structure.

[0016] According to one embodiment of the utility model, the sleeve has a plurality of openings, the plurality of openings are arranged circumferentially and spaced apart, and each opening extends between the upper part and the lower part.

[0017] According to one embodiment of the utility model, the upper part and the lower part are internally provided with a memory metal sheet.

[0018] According to one embodiment of the utility model, the peripheral wall of the outer sleeve is provided with a first hole group and a second hole group, the first hole group and the second hole group are arranged at intervals in the axial direction of the outer sleeve, and the first hole group and the second hole group each include at least one positioning hole.

[0019] The outer wall of the catheter is provided with at least one protruding positioning protrusion, and the at least one positioning protrusion corresponds to the at least one positioning hole in a one-to-one manner.

[0020] When the outer sleeve is located at the first position, the positioning protrusion is positioned and matched with the positioning hole of the first hole group, and when the outer sleeve slides from the first position to the second position, the positioning protrusion is positioned and matched with the positioning hole of the second hole group.

[0021] According to one embodiment of the utility model, the surface of the upper part is provided with anti-skid texture, and the anti-skid texture includes a plurality of circumferentially distributed dot-shaped parts.

[0022] According to one embodiment of the utility model, the outer fixing member is slidably sleeved on the outer sleeve.

[0023] Additional aspects and advantages of the utility model will be partially given in the following description, partially will become obvious from the following description, or will be understood through the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained from the structure shown in the drawings without creative labor.

[0025] Fig. 1 It is the structure schematic diagram of the percutaneous modified fistula tube under gastroscope of the embodiment of the utility model;

[0026] Fig. 2 It is the partial structure schematic diagram of the percutaneous modified fistula tube under gastroscope of the embodiment of the utility model;

[0027] Fig. 3 It is the exploded view of the percutaneous modified fistula tube under gastroscope of the embodiment of the utility model.

[0028] REFERENCE NUMERALS:

[0029] 10, catheter;

[0030] 101, positioning protrusion;

[0031] H101, first interface;

[0032] H102, second interface;

[0033] 20, inner fixing member;

[0034] 201, sliding ring;

[0035] 202, fixed ring;

[0036] 203, baffle sleeve;

[0037] 203a, upper part;

[0038] 203b, lower part;

[0039] 203c, connecting part;

[0040] H20, opening;

[0041] 30, outer sleeve;

[0042] H301, first hole group;

[0043] H302, second hole group;

[0044] 40, outer fixing member.

[0045] The realization, functional features and advantages of the utility model will be further described with reference to the drawings in combination with embodiments. DETAILED DESCRIPTION

[0046] The embodiments of the utility model will be described in detail below, examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the utility model, and cannot be understood as a limitation of the utility model, all other embodiments obtained by those skilled in the art without creative labor based on the embodiments in the utility model belong to the scope protected by the utility model.

[0047] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms 'center', 'longitudinal', 'transverse', 'length', 'width', 'thickness', 'upper', 'lower', 'front','rear', 'left', 'right','vertical', 'horizontal', 'top', 'bottom', 'inner', 'outer', 'clockwise', 'counterclockwise', 'axial', 'circumferential', 'radial' and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and is not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation of the utility model.

[0048] In addition, the terms "first", "second", etc. are used only for descriptive purposes and should not be construed as indicating or implying relative importance or an indicated number of technical features. Therefore, the features defined as "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0049] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0050] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature in the second feature can include the direct contact of the first and second features, or it can include the contact of the first and second features through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature in the second feature include the vertical direction of the first feature above and obliquely above the second feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The "lower", "lower" and "lower" of the first feature in the second feature include the vertical direction of the first feature below and obliquely below the second feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0051] The percutaneous modified gastrostomy tube under gastroscopy according to the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0052] Referring to Figs. 1 to 3 As shown in the drawings, the percutaneous modified gastrostomy tube under gastroscopy provided by the embodiments of the present application comprises a catheter 10, an internal fixation member 20 and an external sleeve 30.

[0053] Specifically, the distal end of the catheter 10 has a first interface H101 and a second interface H102, and the distal end refers to the end exposed outside the body. A plurality of scale marks are arranged on the wall of the catheter 10 in the axial direction, which facilitates the medical staff to judge the insertion depth of the catheter 10. The first interface H101 is used to connect a nutrient infusion device, and the second interface H102 can be used for drug injection or flushing.

[0054] The inner fixing member 20 is made of deformable plastic material and is sleeved on the catheter 10. Exemplarily, the inner fixing member 20 can be made of thermoplastic polyurethane (TPU) material. The inner fixing member 20 has a hollow structure with an inner diameter greater than the outer diameter of the catheter 10, and can be sleeved on the proximal end of the catheter 10, which is the end entering the stomach. Preferably, the inner fixing member 20 is designed with multiple creases in the circumferential direction, which are uniformly distributed in the axial direction, so that it has controllable compression deformation characteristics. In the natural state, the inner fixing member 20 is in the form of a regular cylinder with an outer diameter smaller than the inner diameter of the esophagus of the infant, facilitating the insertion operation of the catheter 10.

[0055] The outer sleeve 30 is sleeved on the catheter 10 and is slidable relative to the catheter 10 between a first position and a second position. The lower end of the outer sleeve 30 is connected to the inner fixing member 20, for example, fixedly connected, integrally formed, etc. The outer sleeve 30 is made of medical grade plastic and has appropriate hardness, so that it can slide freely on the catheter 10. The inner diameter of the outer sleeve 30 is slightly larger than the outer diameter of the catheter 10, ensuring smooth sliding. The first position is located away from the inner fixing member 20, which does not affect the natural state of the inner fixing member 20; the second position is close to the inner fixing member 20, and the end of the outer sleeve 30 can exert axial pressure on the inner fixing member 20.

[0056] The inner fixing member 20 is configured as an axially compressible structure, and when the outer sleeve 30 is in the first position, the inner fixing member 20 is in a natural state and forms a cylindrical structure, and when the outer sleeve 30 slides from the first position to the second position, one end of the outer sleeve 30 presses the inner fixing member 20, so that the inner fixing member 20 switches to a compressed state and forms an umbrella-shaped structure.

[0057] That is, in specific applications, when the outer sleeve 30 is in the first position, the inner fixing member 20 maintains the natural form of the cylindrical shape and is generally in the form of a cylindrical structure, and at this time the radial dimension of the inner fixing member 20 is small, facilitating insertion through the throat and esophagus into the stomach. When the catheter 10 reaches the predetermined position, the doctor pushes the outer sleeve 30 to the second position, and the end of the outer sleeve 30 exerts axial pressure on the inner fixing member 20. Under the action of this pressure, the inner fixing member 20 deforms and is compressed from a cylindrical shape to an umbrella-shaped structure. The outer diameter of this umbrella-shaped structure is significantly greater than the diameter of the catheter 10, which can effectively block the inside of the stomach wall and prevent the catheter 10 from coming out.

[0058] According to the gastroscope percutaneous modified fistula tube, the inner fixing part 20 is made of deformable plastic material, and a compressible structure is designed, and the state conversion of the inner fixing part 20 is realized by cooperation of the slidable outer sleeve 30. Specifically, when the outer sleeve 30 is located at the first position, the inner fixing part 20 presents a natural state of a columnar cylinder, and the structure has a small radial dimension, and the passage resistance of the catheter 10 in the throat, esophagus and other parts of the infant is significantly reduced; when the catheter 10 reaches the target position, the outer sleeve 30 is slid to the second position, and the extrusion effect of the end of the outer sleeve 30 is utilized to compress and deform the inner fixing part 20 from the columnar cylinder into an umbrella structure, so that the stopping effect in the stomach is realized. The deformable design not only solves the problem of too large size and difficult passage of the traditional hard disc-shaped inner fixing part 20, but also greatly reduces the damage risk to the infant tissue due to the use of deformable plastic material. The gastroscope percutaneous modified fistula tube can ensure the fixing effect, significantly improve the operation safety and operation convenience, and is especially suitable for infant patients, and has important clinical application value.

[0059] In an embodiment of the utility model, inner fixing part 20 includes fixed ring 202, sliding ring 201 and baffle 203, fixed ring 202 is fixed in the proximal end of catheter 10, sliding ring 201 is slidably sleeved on catheter 10, baffle 203 is sleeved on catheter 10, and one end of baffle 203 is connected with fixed ring 202, and the other end of baffle 203 is connected with sliding ring 201.

[0060] When one end of outer sleeve 30 pushes sliding ring 201 to slide to the proximal end of catheter 10, inner fixing part 20 is compressed to form an umbrella structure.

[0061] Specifically, the inner diameter of fixed ring 202 is matched with the outer diameter of catheter 10, and is firmly fixed at the proximal end of catheter 10 by bonding, hot melting or the like. The inner diameter of sliding ring 201 is slightly larger than the outer diameter of catheter 10, so that it can smoothly slide on the surface of catheter 10. Preferably, fixed ring 202, sliding ring 201 and baffle ring are made of the same material. Fixed ring 202 and sliding ring 201 are formed in an integral structure with baffle 203. Baffle 203 is a thin-walled hollow structure, and the wall thickness is 1.5 to 3.5 mm, which not only ensures sufficient strength, but also ensures appropriate compressibility.

[0062] In use, after the catheter 10 is inserted into a predetermined position, the physician pushes the outer sleeve 30 to move proximally. The end of the outer sleeve 30 first contacts the sliding ring 201 and pushes the sliding ring 201 to move towards the fixed ring 202. Since the fixed ring 202 is fixed in position and the sliding ring 201 is forced to approach the fixed ring 202, the blocking sleeve 203 connected between the two will be compressed. During compression, the blocking sleeve 203 expands and deforms radially outward, and finally forms an umbrella structure.

[0063] In this embodiment, the structure of the fixed ring 202, the sliding ring 201 and the blocking sleeve 203 is combined, and the cooperation of the fixed ring 202 and the sliding ring 201 realizes the control of the deformation of the blocking sleeve 203. The whole structure is simple and reliable, and is easy to manufacture and assemble.

[0064] Preferably, the lower end of the outer sleeve 30 is formed in an integral structure with the sliding ring 201, or is fixedly connected together by bonding or welding, and thus facilitates the switching of the inner fixation member 20 between the two states.

[0065] In an embodiment of the utility model, the blocking sleeve 203 comprises an upper portion 203a, a lower portion 203b and a connecting portion 203c connected between the upper portion 203a and the lower portion 203b.

[0066] When the outer sleeve 30 slides to the second position, the upper portion 203a is in a horizontal state, the lower portion 203b is in an inclined state, and the upper portion 203a and the lower portion 203b combine to form the umbrella structure.

[0067] That is, in this embodiment, the blocking sleeve 203 mainly comprises an upper portion 203a, a lower portion 203b and a connecting portion 203c connected between the upper portion 203a and the lower portion 203b. The upper portion 203a and the lower portion 203b adopt a thin-walled hollow structure, and the connecting portion 203c connects the upper portion 203a and the lower portion 203b. In the natural state, the upper portion 203a, the lower portion 203b and the connecting portion 203c are coaxially arranged in a columnar shape, and the whole blocking sleeve 203 has a straight cylindrical shape.

[0068] When the outer sleeve 30 slides to the second position, one end thereof pushes the upper portion 203a and pushes downward. Due to the constraint of the fixed ring 202, the lower portion 203b can only expand radially outward and tilt, and the upper portion 203a moves downward and expands outward to finally form a horizontal state. The connecting portion 203c provides a reliable bending position, so that the upper portion 203a and the lower portion 203b are compressed to form an umbrella structure.

[0069] The combination design of the upper portion 203a, the lower portion 203b and the connecting portion 203c of the blocking sleeve 203 makes the blocking sleeve 203 have reliable compressible deformation capability. When the outer sleeve 30 is pushed downward, the umbrella structure is naturally formed, thereby efficiently realizing the state conversion function of the inner fixing member 20. This design not only has simple operation, but also has soft and controllable deformation process, thereby significantly improving the reliability.

[0070] Preferably, the crease is arranged on the connecting portion 203c and extends in the circumferential direction, so that when the blocking sleeve 203 is compressed, controllable compression deformation is realized.

[0071] In an embodiment of the utility model, the blocking sleeve 203 has a plurality of openings H20, the plurality of openings H20 are arranged in the circumferential direction and spaced apart, and each opening H20 extends between the upper portion 203a and the lower portion 203b.

[0072] Preferably, the openings H20 are long strip-shaped holes penetrating the upper portion 203a and the lower portion 203b of the blocking sleeve 203. The length of the opening H20 accounts for about 60%-80% of the overall length of the blocking sleeve 203, which is sufficient to enable the upper portion 203a and the lower portion 203b to move relative to each other when deformed. The number of openings H20 is generally 3-6, which are uniformly distributed in the circumferential direction. The appropriate number of openings H20 can ensure the overall strength of the blocking sleeve 203 while providing sufficient freedom for the compression movement of the upper portion 203a and the lower portion 203b.

[0073] By designing a plurality of circumferentially spaced openings H20 on the blocking sleeve 203, the blocking sleeve 203 can be efficiently switched between the umbrella shape and the cylindrical shape, and the deformation process is more flexible, without excessive stretching of the material, thereby reducing the risk of structural failure and improving the reliability of the structure.

[0074] Advantageously, the upper portion 203a and the lower portion 203b are internally provided with a memory metal sheet. The memory metal sheet is made of a shape memory alloy material, such as a Nitinol material. Such an alloy exhibits different inherent shapes at different temperatures. The shape of the memory metal sheet is usually designed as a geometric shape matching the umbrella structure of the blocking sleeve 203. In the manufacturing process, the memory metal sheet is first processed into an umbrella structure at high temperature, and then stretched into a straight line shape at low temperature. In the natural state, the shape of the memory metal sheet is consistent with the blocking sleeve 203, both of which are in the form of a cylindrical straight pipe structure.

[0075] When the outer sleeve 30 pushes the lower part 203b, the area where the memory metal sheet is located first begins to deform. As the deformation deepens, the memory metal sheet will gradually recover to the umbrella-shaped memory shape at high temperature under the action of internal tension and restoring force. This recovery shape process provides additional driving force for the deformation of the retaining sleeve 203, so that it more smoothly completes the conversion from the columnar shape to the umbrella shape.

[0076] In an embodiment of the present application, the peripheral wall of the outer sleeve 30 is provided with a first hole group H301 and a second hole group H302, the first hole group H301 and the second hole group H302 are arranged at intervals in the axial direction of the outer sleeve 30, and the first hole group H301 and the second hole group H302 each include at least one positioning hole.

[0077] The outer wall of the catheter 10 is provided with at least one protruding positioning protrusion 101, and the at least one positioning protrusion 101 corresponds to the at least one positioning hole one by one.

[0078] When the outer sleeve 30 is located at the first position, the positioning protrusion 101 is positioned and matched with the positioning hole of the first hole group H301, and when the outer sleeve 30 slides from the first position to the second position, the positioning protrusion 101 is positioned and matched with the positioning hole of the second hole group H302.

[0079] In this embodiment, in order to accurately control the positioning of the outer sleeve 30 at the first position and the second position, the first hole group H301 and the second hole group H302 are arranged on the peripheral wall of the outer sleeve 30, and the corresponding positioning protrusion 101 is arranged on the outer wall of the catheter 10. The shape of the positioning hole can be designed as a circle, a square or other geometric shapes, and the size needs to match the positioning protrusion 101.

[0080] In use, when the outer sleeve 30 is in the first position, the positioning hole of the first hole group H301 is accurately engaged with the positioning protrusion 101 on the catheter 10, so as to firmly lock the outer sleeve 30 in this position and avoid sliding. When it is needed to push the outer sleeve 30 to the second position, the operator pushes the outer sleeve 30 until the positioning protrusion 101 is re-locked with the positioning hole of the second hole group H302, that is, the position conversion is completed.

[0081] The design of the positioning structure enables the outer sleeve 30 to be accurately positioned at two positions, and the engagement mode of the positioning protrusion 101 and the positioning hole can effectively prevent the outer sleeve 30 from moving accidentally during use, and the internal fixation member 20 maintains a stable columnar shape or umbrella shape at different positions, ensuring the safety and reliability of the operation.

[0082] In one embodiment of the utility model, the surface of the upper part 203a is provided with anti-skid texture, and the anti-skid texture comprises a plurality of circumferentially distributed dot-shaped parts. Exemplarily, the dot-shaped parts are in a hemispherical convex structure. The dot-shaped parts are integrally formed with the same TPU material as the baffle 203, thereby ensuring good biocompatibility.

[0083] When the inner fixing part 20 is compressed to form an umbrella-shaped structure under the action of the outer sleeve 30, the upper part 203a is in a horizontal state, and the dot-shaped parts on the surface thereof are in direct contact with the stomach wall. These uniformly distributed small protrusions can increase the contact area, provide moderate friction, and improve the stopping and fixing effect of the inner fixing part 20.

[0084] The embodiment sets the dot-shaped anti-skid texture on the surface of the upper part 203a, thereby improving the fixing stability between the inner fixing part 20 and the stomach wall and ensuring good biocompatibility and safety.

[0085] In one embodiment of the utility model, the outer fixing part 40 is slidably sleeved on the outer sleeve 30.

[0086] The outer fixing part 40 is usually a disc-shaped structure and is slidably sleeved on the outer sleeve 30. In use, after the proximal end of the catheter 10 is placed inside the stomach, the outer sleeve 30 is pushed down to switch the inner fixing part 20 to an umbrella-shaped structure, stop it against the stomach wall, and then the outer fixing part 40 is slid down to the body surface of the human body and is fixed on the body surface of the human body by a fixing part such as a medical adhesive tape.

[0087] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the utility model. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or features of the embodiments or examples described in the specification without contradiction.

[0088] The above is only the preferred embodiment of the utility model, and does not limit the patent range of the utility model, and any equivalent structural transformation made by using the contents of the utility model specification and drawings, or direct / indirect application in other related technical fields is included in the patent protection range of the utility model.

Claims

1. A percutaneous modified gastrostomy tube under gastroscopy, characterized in that, The application relates to a catheter device, comprising: a catheter, the distal end of the catheter being provided with a first interface and a second interface; an inner fixing member, the inner fixing member being made of deformable plastic material and sleeved on the catheter; an outer sleeve, the outer sleeve being sleeved on the catheter and slidable relative to the catheter between a first position and a second position, the lower end of the outer sleeve being connected with the inner fixing member; wherein the inner fixing member is configured as an axial compressible structure, when the outer sleeve is located at the first position, the inner fixing member is in a natural state and forms a cylindrical structure, when the outer sleeve is slid from the first position to the second position, one end of the outer sleeve presses the inner fixing member, so that the inner fixing member is switched to a compressed state and forms an umbrella-shaped structure.

2. The endoscopic percutaneous modified fistula tube of claim 1, wherein, The inner fixing member comprises a fixed ring, a sliding ring and a retaining sleeve, the fixed ring is fixed at the proximal end of the catheter, the sliding ring is slidably sleeved on the catheter, the retaining sleeve is sleeved on the catheter, and one end of the retaining sleeve is connected with the fixed ring, and the other end of the retaining sleeve is connected with the sliding ring; when one end of the outer sleeve pushes the sliding ring to slide towards the proximal end of the catheter, the inner fixing member is compressed to form an umbrella-shaped structure.

3. The endoscopic percutaneous modified fistula tube of claim 2, wherein, The retaining sleeve comprises an upper part, a lower part and a connecting part connected between the upper part and the lower part; when the outer sleeve is slid to the second position, the upper part is in a horizontal state, the lower part is in an inclined state, and the upper part and the lower part combine to form the umbrella-shaped structure.

4. The endoscopic percutaneous modified fistula tube of claim 3, wherein, The retaining sleeve has a plurality of openings, the plurality of openings are circumferentially spaced, and each opening extends between the upper part and the lower part.

5. The endoscopic percutaneous modified fistula tube of claim 3, wherein, The upper part and the lower part are internally provided with memory metal sheets.

6. The endoscopic percutaneous modified fistula graft of claim 1, wherein, The peripheral wall of the outer sleeve is provided with a first hole group and a second hole group, the first hole group and the second hole group are arranged at intervals in the axial direction of the outer sleeve, and the first hole group and the second hole group each comprise at least one positioning hole; The outer wall of the catheter is provided with at least one protruding positioning protrusion, and the at least one positioning protrusion corresponds to the at least one positioning hole in a one-to-one manner; when the outer sleeve is located at the first position, the positioning protrusion is positioned and matched with the positioning hole of the first hole group, and when the outer sleeve is slid from the first position to the second position, the positioning protrusion is positioned and matched with the positioning hole of the second hole group.

7. The endoscopic percutaneous modified fistula graft of claim 3, wherein, The surface of the upper part is provided with anti-slip textures, and the anti-slip textures comprise a plurality of circumferentially distributed dot-shaped parts.

8. The endoscopic percutaneous modified fistula tube of claim 1, wherein, The application further comprises an outer fixing member, the outer fixing member being slidably sleeved on the outer sleeve.

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