Guide wire for peritoneal dialysis indwelling catheter and indwelling catheter device

Abstract

The invention relates to a guide wire for a peritoneal dialysis indwelling catheter and an indwelling catheter device, and belongs to the technical field of medical instruments. In order to reduce the probability that the guide wire scratches or punctures the peritoneum, the intestinal tract or the blood vessel in the peritoneal dialysis indwelling catheter operation, improve the operation safety and reduce the operation difficulty, the invention provides the guide wire for the peritoneal dialysis indwelling catheter. The guide wire comprises a body, an expansion piece and an expansion piece, the expansion piece is arranged at one end of the body and provided with an expansion cavity, and the side face, away from the body, of the expansion piece is an arc face. And the expanding piece is connected with the main body and is used for expanding or shrinking the expanding piece. In practical application, the guide wire is matched with the dialysis catheter to realize catheter placement operation. The expansion piece arranged on the guide wire head can change the shape of the guide wire head, increase the contact area of the guide wire head and parts such as peritoneum, intestinal tract or blood vessels in the operation process, buffer the pressure applied to the peritoneum, intestinal tract or blood vessels by the guide wire, reduce the probability that the guide wire scratches or punctures the peritoneum, intestinal tract or blood vessels, improve the operation safety and reduce the operation difficulty.

Description

Technical Field

[0001] The invention relates to a guide wire for peritoneal dialysis catheter placement and a catheter placement device, belonging to the technical field of medical devices. Background Art

[0002] Peritoneal dialysis (PD) is an important renal replacement therapy for patients with end-stage renal disease (ESRD). Its core function is to use the peritoneum as a dialysis membrane and peritoneal dialysis fluid for substance exchange. Peritoneal dialysis catheterization is a procedure that inserts a peritoneal dialysis catheter into the patient's abdominal cavity to establish a peritoneal dialysis access. During peritoneal dialysis catheterization, a guidewire is required to support and position the peritoneal dialysis catheter, helping the physician accurately place the catheter in the appropriate location within the abdominal cavity, such as the vesicorectal pouch.

[0003] For example, the patent with the authorization publication number CN204050630U and the announcement date of 20141231 discloses a guidewire for peritoneal dialysis catheter placement, which includes a stainless steel guidewire and a movable slot. The stainless steel guidewire is provided with a measuring scale. The movable slot includes two fixings and a screw. The screw passes through the two fixings, and the two fixings have symmetrical openings to form a slot. One end of the stainless steel guidewire passes through the slot, and the size of the slot is adjusted by turning the screw to fix the stainless steel guidewire. After the stainless steel guidewire is fixed, the maximum outer diameter of the movable slot is larger than the inner diameter of the peritoneal dialysis catheter. A movable slot is added to the stainless steel guidewire, and the movable slot is fixed to different positions on the stainless steel guidewire according to the length of the peritoneal dialysis catheter to prevent the stainless steel guidewire from moving up and down arbitrarily in the peritoneal dialysis catheter and passing through the peritoneal dialysis catheter, thereby damaging the abdominal organs.

[0004] In related technologies, in order to reduce the harm of the guide wire to the patient, the diameter of the guide wire is relatively small. However, in order to support and guide the membrane dialysis catheter into the abdominal cavity, the guide wire also needs to have a certain hardness, which causes the guide wire to easily scratch or puncture the peritoneum, intestines or blood vessels during peritoneal dialysis catheterization surgery, causing secondary harm to the patient. Especially for obese patients, patients with a history of abdominal surgery or abdominal adhesions, the risk is higher, affecting the safety of the operation; and the peritoneal dialysis catheterization surgery is more difficult to operate and requires a high level of doctor experience.

[0005] In view of the shortcomings of the above-mentioned prior art, a peritoneal dialysis catheter guidewire with an enlarged head is designed to overcome the shortcomings of the prior art, so as to reduce the probability of the guidewire scratching or puncturing the peritoneum, intestines or blood vessels during peritoneal dialysis catheterization surgery, improve surgical safety and reduce the difficulty of surgical operation. Summary of the Invention

[0006] In order to overcome the shortcomings of the above-mentioned prior art that the guide wire is prone to scratching or puncturing the peritoneum, intestines or blood vessels, causing secondary damage to the patient, affecting the safety of the operation, and the operation is difficult and requires high experience of the doctor, the present application provides a guide wire and a catheter placement device for peritoneal dialysis catheterization. By arranging an expansion piece on the guide wire head, the shape of the guide wire head is changed to increase its contact area with the peritoneum, intestines or blood vessels during the operation, buffer the pressure applied to the peritoneum, intestines or blood vessels by the guide wire during the operation, reduce the probability of the guide wire scratching or puncturing the peritoneum, intestines or blood vessels, improve the safety of the operation, and reduce the difficulty of the operation.

[0007] Embodiments of the first aspect of the present application provide a guidewire for peritoneal dialysis catheter placement. The guidewire comprises a main body, an expandable member, and a support member. The expandable member is disposed at one end of the main body and has an expansion lumen. The support member connects the main body and the expandable member and allows the expandable member to expand or contract. In practical applications, the guidewire is used in conjunction with a dialysis catheter to facilitate catheter placement.

[0008] In an embodiment of the present application, after the guide wire is connected to the dialysis catheter, part of the structure of the expansion piece extends out of the dialysis catheter, and the expansion piece is placed in an expanded state by the expansion piece. The volume of the expansion piece increases, and the shape of the guide wire head changes. At this time, the guide wire can cooperate with the dialysis catheter to pass through the patient's abdominal incision for catheterization. During the catheterization operation, the expanded expansion piece first contacts the patient's skin texture. The increase in the volume of the expansion piece can increase the contact area of the guide wire head with the peritoneum, intestines or blood vessels during the operation, buffer the pressure applied to the peritoneum, intestines or blood vessels by the guide wire during the operation, reduce the probability of the guide wire scratching or puncturing the peritoneum, intestines or blood vessels, improve the safety of the operation, and also reduce the requirements for the doctor's experience and reduce the difficulty of the operation.

[0009] In some embodiments, the expansion member includes an air bag, and the expansion member includes an air channel, which is disposed in the main body and communicates with the expansion cavity.

[0010] In some embodiments, a first limiting ring is provided at one end of the expansion member close to the main body, and the first limiting ring is provided on the outer wall of the expansion member.

[0011] In some embodiments, the expansion piece includes a head, an expandable part and a tail arranged in sequence along the direction close to the main body, the side of the head away from the tail is an arc surface, the expandable part is provided with multiple folding parts, and the expansion piece is used to stretch or fold the multiple folding parts; the tail is provided with a first limiting ring; the first limiting ring is arranged around the outer wall of the tail.

[0012] In some embodiments, the expansion member includes a plurality of expansion frames that are evenly and spaced apart, and the expansion frame portion is placed in the expansion cavity. Each expansion frame includes a hinged first expansion rod and a second expansion rod, and one end of the first expansion rod and the second expansion rod are hinged to the expandable portion, the other end of the first expansion rod is hinged to the main body, and the other end of the second expansion rod is hinged to the head.

[0013] In some embodiments, the guide wire further includes a limiting plate, which is connected to the main body, and a limiting protrusion is provided on the periphery of one side of the limiting plate close to the expansion piece.

[0014] In some embodiments, the guide wire also includes an adjustment part, which includes a accommodating chamber, a conductive coil and a power supply. The accommodating chamber is arranged inside the main body and is filled with magnetic fluid; the conductive coil is wound around the main body; the power supply is arranged on the limiting plate and is electrically connected to the conductive coil.

[0015] In some embodiments, the adjustment part also includes a first wire and a second wire, one end of the first wire is electrically connected to the power supply, and the other end is electrically connected to one end of the conductive coil; one end of the second wire is electrically connected to the power supply, and the other end is configured to move linearly along the extension direction of the main body to abut against different positions on the conductive coil.

[0016] In some embodiments, the guidewire further includes an ultrasonic probe, which is disposed in the expansion cavity and located at an end of the expansion member away from the main body.

[0017] In some embodiments, the expansion member is formed of a flexible material, including a silicone material.

[0018] An embodiment of the second aspect of the present application provides a catheter placement device, including a peritoneal dialysis catheter placement guidewire in any of the above embodiments, the catheter placement device also including a dialysis catheter, the guidewire being passed through the dialysis catheter, the guidewire including a main body, an expansion piece and an expansion piece, the expansion piece being arranged at one end of the main body and having an expansion cavity; the expansion piece being used to connect the main body and the expansion piece and to expand or contract the expansion piece; a portion of the expansion piece is placed in the dialysis catheter, and the other portion extends from the end of the dialysis catheter.

[0019] In an embodiment of the present application, after the guide wire is connected to the dialysis catheter, part of the structure of the expansion piece extends out of the dialysis catheter, and the expansion piece is placed in an expanded state by the expansion piece. The volume of the expansion piece increases, and the shape of the guide wire head changes. At this time, the guide wire can cooperate with the dialysis catheter to pass through the patient's abdominal incision for catheterization. During the catheterization operation, the expanded expansion piece first contacts the patient's skin texture. The increase in the volume of the expansion piece can increase the contact area of the guide wire head with the peritoneum, intestines or blood vessels during the operation, buffer the pressure applied to the peritoneum, intestines or blood vessels by the guide wire during the operation, reduce the probability of the guide wire scratching or puncturing the peritoneum, intestines or blood vessels, improve the safety of the operation, and also reduce the requirements for the doctor's experience and reduce the difficulty of the operation.

[0020] In some embodiments, a first limiting ring is provided at one end of the expansion piece close to the main body, and the first limiting ring is arranged on the outer wall of the expansion piece; a second limiting ring is provided on the inner wall of the end of the dialysis catheter, and along the extension direction of the dialysis catheter, the projection of the first limiting ring and the projection of the second limiting ring partially overlap. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the structure of a guide wire in one embodiment of the present application.

[0022] Figure 2 Schematic diagram of the connection between the main body and the expansion member in one embodiment of the present application.

[0023] Figure 3 Schematic diagram of the structure of an expansion member in one embodiment of the present application.

[0024] Figure 4 Schematic diagram of the structure of a limiting plate in one embodiment of the present application.

[0025] Figure 5 for Figure 1 Magnified view of area A in the middle.

[0026] Figure 6 Schematic diagram of the structure of the adjustment unit in one embodiment of the present application.

[0027] Figure 7 Schematic diagram of the structure of the adjustment unit in one embodiment of the present application.

[0028] Figure 8 Schematic diagram of the structure of the catheter placement device in one embodiment of the present application.

[0029] Figure 9 This is a top view of the catheter placement device in one embodiment of the present application.

[0030] Figure 10 This is a cross-sectional view of a tube placement device in one embodiment of the present application.

[0031] Figure 11 for Figure 10 Magnified view of area B in the middle.

[0032] Figure 12 This is a cross-sectional view of a tube placement device in one embodiment of the present application.

[0033] Figure 13 for Figure 12 Magnified view of area C in the middle.

[0034] Figure 14 This is a simplified diagram of the shape of the expansion member in one embodiment of the present application.

[0035] Figure 15 This is a simplified diagram of the shape of the expansion member in another embodiment of the present application.

[0036] Figure 16 This is a simplified diagram of the shape of the expansion piece in another embodiment of the present application.

[0037] The marks in the accompanying drawings are: 1-guide wire, 11-main body, 111-first section, 112-second section, 113-hinge seat, 12-expansion piece, 121-expansion cavity, 122-first limiting ring, 123-head, 124-expandable part, 1241-folding part, 125-tail, 13-expansion piece, 131-first expansion rod, 132-second expansion rod, 14-limiting plate, 141-limiting protrusion, 142-through hole, 15-adjustment part, 151-conductive coil, 152-power supply, 153-elastic piece, 154-first wire, 155-second wire, 156-guide plate, 16-handle, 17-ultrasound probe, 2-dialysis catheter, 21-second limiting ring, 22-pressing plate. DETAILED DESCRIPTION

[0038] To facilitate understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present application. However, the present application may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure of the present application.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the relevant listed items.

[0040] When describing positional relationships, unless otherwise specified, when an element such as a layer, film, or substrate is referred to as being "on" another element, it can be directly on the other element or intervening elements may also be present. Furthermore, when a layer is referred to as being "under" another layer, it can be directly under or one or more intervening elements may also be present. It will also be understood that when a layer is referred to as being "between" two layers, it can be the only layer between the two layers or one or more intervening elements may also be present.

[0041] In the case of using “including,” “having,” and “comprising” described herein, another component may be added unless a clear limiting term such as “only,” “consisting of,” etc. is used. Unless mentioned otherwise, a term in the singular form may include a plural form and should not be understood as having one number.

[0042] It should be understood that although the terms "first," "second," etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element, without departing from the scope of this application.

[0043] It should also be understood that when interpreting an element, even if not explicitly described, the element is interpreted as including a range of error, which should be within the acceptable deviation range of the specific value determined by those skilled in the art. For example, "approximately," "approximately," or "substantially" can mean within one or more standard deviations, and is not limited here.

[0044] Furthermore, in the specification, the phrase “planar distribution diagram” refers to a drawing when the target portion is viewed from above, and the phrase “cross-sectional diagram” refers to a drawing when a section taken by vertically cutting the target portion is viewed from the side.

[0045] In addition, the drawings are not drawn to a 1:1 scale, and the relative sizes of the elements in the drawings are drawn only as examples and not necessarily according to the true scale.

[0046] The present application provides a guide wire 1 and a catheter placement device for peritoneal dialysis catheter placement. By providing an expansion piece at the head of the guide wire 1, the shape of the head of the guide wire 1 is changed to increase its contact area with the peritoneum, intestines, blood vessels, etc. during the operation, buffer the pressure applied to the peritoneum, intestines, or blood vessels by the guide wire 1 during the operation, reduce the probability of the guide wire 1 scratching or puncturing the peritoneum, intestines, or blood vessels, improve the safety of the operation, and reduce the difficulty of the surgical operation.

[0047] The embodiment of the first aspect of the present application provides a guide wire 1 for peritoneal dialysis catheter placement, such as Figure 1 As shown, the guidewire 1 includes a main body 11, an expansion member 12, and a support member 13. The expansion member 12 is disposed at one end of the main body 11 and has an expansion cavity 121. The support member 13 is used to connect the main body 11 and the expansion member 12 and to expand or contract the expansion member 12. When expanded, the side of the expansion member 12 away from the main body 11 is a curved surface.

[0048] In the embodiment of the present application, in actual use, the guide wire 1 cooperates with the dialysis catheter 2 to implement the catheterization operation, and the guide wire and the dialysis catheter 2 are in a relatively static state during the catheterization process. Before the guide wire 1 is connected to the dialysis catheter 2, the expansion member 12 is placed in a contracted state by the expansion member 13, so that the guide wire 1 can be inserted into the dialysis catheter 2. The guide wire 1 can give the dialysis catheter 2 a certain degree of rigidity during the catheterization process, thereby guiding the movement of the soft and easily bent dialysis catheter 2, so that the dialysis catheter 2 can pass through the abdominal incision to reach the abdominal cavity and implement the catheterization operation.

[0049] In the embodiment of the present application, after the guidewire 1 is connected to the dialysis catheter 2, a portion of the structure of the expansion member 12 extends out of the dialysis catheter 2. The expansion member 13 places the expansion member 12 in an expanded state, increasing the volume of the expansion member 12 and changing the shape of the head of the guidewire 1. At this point, the guidewire 1 can cooperate with the dialysis catheter 2 to pass through the patient's abdominal incision for catheterization. Preferably, along the extension direction of the dialysis catheter 2, the projection of the expanded expansion member 12 overlaps the projection of the dialysis catheter 2, i.e., the maximum outer diameter of the expanded expansion member 12 is greater than or equal to the outer diameter of the dialysis catheter 2.

[0050] In the embodiment of the present application, during the catheterization operation, the expanded expansion piece 12 first contacts the patient's skin texture. The increase in the volume of the expansion piece 12 can increase the contact area between the head of the guide wire 1 and the peritoneum, intestines or blood vessels during the operation, buffer the pressure applied to the peritoneum, intestines or blood vessels by the buffer guide wire 1 during the operation, reduce the probability of the guide wire 1 scratching or puncturing the peritoneum, intestines or blood vessels, improve the safety of the operation, and also reduce the difficulty of the surgical operation, lower the technical threshold, and reduce the requirements for the doctor's experience in the operation, so that grassroots hospitals can also safely carry out peritoneal dialysis catheterization and promote tiered diagnosis and treatment.

[0051] In the embodiment of the present application, after the dialysis catheter 2 is placed at a designated position in the abdominal cavity, the expansion member 12 is contracted again by the expansion member 13 to reduce its volume, so that the guide wire 1 can be pulled out of the dialysis catheter 2 as a whole, avoiding affecting the subsequent diversion work of the dialysis catheter 2.

[0052] In some embodiments, the expansion member 12 is formed from a flexible material, including but not limited to silicone, natural rubber, silicone rubber, polyurethane, polyvinyl chloride (PVC), and thermoplastic elastomer (TPE). These flexible materials exhibit excellent biocompatibility, elasticity, corrosion resistance, and sealing properties, ensuring the safety and effectiveness of the expansion member 12 in medical applications.

[0053] In some embodiments, the material of the main body 11 can be stainless steel or nickel-titanium alloy, and can also be a bendable material. The end of the main body 11 away from the expansion piece 12 can be folded into an arc as a handle 16, or folded into a ring to fix the guide wire 1, so that medical staff can insert or withdraw the guide wire 1, thereby improving surgical efficiency. Here, bending the main body 11 requires the use of an instrument or a large force. A simple push will not bend the main body 11 into a ring. The length of the guide wire 1 is greater than or equal to 80 cm and less than or equal to 100 cm, and the outer diameter of the main body 11 is greater than or equal to 1 mm and less than or equal to 2 mm. Optionally, the main body 11 also has an inner cavity, and the diameter of the inner cavity is greater than or equal to 0.5 mm and less than or equal to 1.5 mm. The setting of the inner cavity can reduce the materials required for the preparation of the guide wire 1 and reduce the application cost.

[0054] In some embodiments, as Figure 11 and Figure 13 As shown, a first limiting ring 122 is provided at one end of the expansion member 12 near the main body 11. The first limiting ring 122 is disposed around the outer wall of the expansion member 12. A second limiting ring 21 is provided on the inner wall of the distal end of the dialysis catheter 2. Along the extension direction of the dialysis catheter 2, the projection of the first limiting ring 122 is within the projection of the lumen of the dialysis catheter 2, and the projection of the first limiting ring 122 partially overlaps with the projection of the second limiting ring 21.

[0055] In the embodiment of the present application, the projection range of the first limiting ring 122 is located within the projection range of the lumen of the dialysis catheter 2, that is, the outer diameter of the first limiting ring 122 is smaller than the inner diameter of the lumen, so that the guide wire 1 can be smoothly inserted into or withdrawn from the lumen of the dialysis catheter 2. The projection range of the first limiting ring 122 is located within the projection range of the second limiting ring 21, that is, the outer diameter of the first limiting ring 122 is larger than the inner diameter of the second limiting ring 21. When the expansion member 12 moves to the end of the dialysis catheter 2, the first limiting ring 122 abuts against the second limiting ring 21, and the second limiting ring 21 can block the expansion member 12, hindering the guide wire 1 from continuing to advance, preventing the guide wire 1 from detaching from the dialysis catheter 2 and continuing to extend into the abdominal cavity during the catheterization process, reducing the probability of damage to the patient's abdominal cavity wall due to excessive puncture, and improving surgical safety.

[0056] In some embodiments, as Figure 2 、 Figure 3 、 Figure 11 and Figure 13 As shown, the expansion piece 12 includes a head 123, an expandable support portion 124 and a tail 125 arranged in sequence along the direction close to the main body 11. The side of the head 123 away from the tail 125 is an arc surface. The expandable support portion 124 is provided with multiple folding portions 1241. The expansion piece 13 is used to stretch or fold the multiple folding portions 1241; the tail 125 is provided with a first limiting ring 122; the first limiting ring 122 is wrapped around the outer wall of the tail 125.

[0057] In this embodiment of the present application, the projection of the head 123 of the expansion member 12 along the extension direction of the dialysis catheter 2 is located within the projection of the smallest lumen of the dialysis catheter 2. That is, the maximum outer diameter of the head 123 is smaller than the inner diameter of the lumen, facilitating the expansion member 12 to extend or retract into the lumen of the dialysis catheter 2. When the folding portion 1241 is folded, the expansion member 12 is in a contracted state, facilitating the insertion or withdrawal of a guidewire. When the folding portion 1241 is extended, the expansion member 12 expands, reducing the probability of the guidewire 1 scratching the peritoneum during catheterization and improving surgical safety.

[0058] In some embodiments, the expansion member 13 includes a plurality of expansion frames that are evenly and spaced apart, and the expansion frame portion is placed in the expansion cavity 121. Each expansion frame includes a hinged first expansion rod 131 and a second expansion rod 132. One end of the first expansion rod 131 and the second expansion rod 132 is hinged and is also hinged to the expandable portion 124. The other end of the first expansion rod 131 is hinged to the main body 11, and the other end of the second expansion rod 132 is hinged to the head 123. Each folding portion 1241 is located between adjacent expansion frames.

[0059] In the embodiment of this application, Figure 11 As shown, before the catheterization operation, the doctor provides a thrust to the tail end of the main body 11 to push the guide wire 1 into the dialysis catheter 2. The main body 11 and the expansion piece 12 move synchronously. During the insertion process, the expansion piece 13 is subjected to force during the movement, causing the expansion piece 12 to partially expand. However, under the squeezing pressure provided by the lumen, the expansion range of the expansion piece 12 is small. Under the combined effect of the doctor's thrust and the size design of the head 123 of the expansion piece 12, it can still be smoothly extended out of the lumen to ensure working stability.

[0060] In the embodiment of this application, Figure 11 As shown, due to the relatively small outer diameter of the main body 11, after the first expansion rod 131 connects the main body 11 and the expandable portion 124, the first expansion rod 131 is tilted relative to the main body 11 within the expansion chamber 121. The main body 11 is provided with a hinge seat 113, and the first expansion rod 131 is hinged to the main body 11 via the hinge seat 113. The expansion member 13 may include three, four, five, or six expansion racks that are evenly and spaced apart. The greater the number of expansion racks, the higher the stability of the expansion member 12 after expansion. The number of expansion racks can be set according to actual needs and is not limited in this application.

[0061] In the embodiment of this application, Figure 13As shown, under the action of the thrust, the head 123 and part of the expandable portion 124 of the expansion member 12 extend out of the lumen until the first limiting ring 122 abuts the second limiting ring 21, the expansion member 12 engages with the lumen, and stops moving. At this time, the thrust is continued to be applied to the main body 11, and the main body 11 continues to move to push the first expansion rod 131 and the second expansion rod 132 to move. Under the inclination trend of the first expansion rod 131, the non-hinged ends of the first expansion rod 131 and the second expansion rod 132 move in a direction of approaching each other, and the adjacent expansion frames move in a direction of moving away from each other, thereby unfolding the folded portion 1241 between the adjacent expansion frames, causing the expansion member 12 to expand. The thrust applied to the main body 11 is maintained throughout the catheterization process until the dialysis catheter 2 is placed at the designated position in the abdominal cavity, so that the expansion member 12 always remains in an expanded state during the catheterization process, reducing the probability of the guide wire 1 scratching the peritoneum and improving the safety of the operation.

[0062] In the embodiment of the present application, since the expansion frame itself has a certain rigidity, the expansion piece 12 can also have a certain rigidity after expansion. The flexible expansion piece 12 covers the expansion frame, which can buffer the pressure applied to the inner wall of the abdominal cavity by the front end of the guide wire 1 while facilitating the insertion of the guide wire 1, thereby reducing the probability of the guide wire 1 scratching the inner peritoneum during the catheterization process and improving the safety of the operation.

[0063] In some embodiments, the expansion member 13 can also be a structure similar to a folding umbrella rib. In this case, the expansion member 12 is an umbrella structure, which can not only achieve the contraction of the expansion member 12 to facilitate the insertion and withdrawal of the guide wire as a whole, but also achieve the expansion of the expansion member 12 to reduce the probability of the guide wire 1 scratching the peritoneum during the catheterization process, thereby improving the safety of the operation.

[0064] In some embodiments, the expansion member 12 includes an airbag, and the expansion member 13 includes an airway, which is disposed within the main body 11 and communicates with the expansion cavity 121. After the main body 11 and the deflated expansion member 12 are inserted into the lumen of the dialysis catheter 2, an inflatable and exhaust member, such as an air pump, is used to deliver air into the airway to inflate and expand the airbag, and then the airway is closed for catheterization. After the dialysis catheter 2 reaches the designated position in the abdominal cavity, the airway is opened to vent the airbag, reducing the volume of the expansion member 12 so that the guide wire 1 can be withdrawn from the dialysis catheter 2 as a whole, completing the catheterization operation.

[0065] In the embodiment of this application, Figure 14 、 Figure 15 and Figure 16As shown, the expansion member 12 can be spherical, ellipsoidal, hemispherical, or mushroom-shaped. The expansion size and shape of the expansion member 12 can be adjusted based on actual needs and are not limited to symmetry in this application. The expansion member 12 includes, but is not limited to, medical airbags made of materials such as silicone, natural rubber, silicone rubber, polyurethane, polyvinyl chloride (PVC), and thermoplastic elastomer (TPE). It exhibits excellent biocompatibility, softness, elasticity, corrosion resistance, and good sealing properties to ensure its safety and effectiveness in medical applications.

[0066] In some embodiments, the expansion member 12 may also be a water bag, and the airway may also be used to fill the water bag with water.

[0067] In some embodiments, as Figure 4 As shown, the guidewire 1 also includes a limiting plate 14, which is connected to the main body 11. A limiting protrusion 141 is provided on the periphery of one side of the limiting plate 14 near the expansion piece 12. A through hole 142 is provided in the central area of the limiting plate 14, and the main body 11 is connected to the limiting plate 14 through the through hole 142. After the guidewire 1 is inserted into the lumen of the dialysis catheter 2, the limiting protrusion 141 can be engaged with the outer wall of the head end of the dialysis catheter 2 away from the expansion piece 12, which can reduce the probability of the limiting plate 14 shaking relative to the dialysis catheter 2 during the catheterization operation without affecting the insertion and withdrawal of the main body 11. The limiting plate 14 can limit the main body 11, thereby reducing the probability of the main body 11 shaking radially relative to the dialysis catheter 2 during the catheterization operation, improving the connection stability between the guidewire 1 and the dialysis catheter 2, improving the stability of the catheterization operation, and reducing the difficulty of the surgical operation.

[0068] In the embodiment of the present application, during the catheterization procedure, the head end of the dialysis catheter 2 is always placed in the external environment and does not enter the abdominal cavity. The stopper plate 14 can seal the head end of the dialysis catheter 2, reducing the probability of impurities in the external environment entering the abdominal cavity through the dialysis catheter 2, reducing the risk of infection, and further improving surgical safety. The stopper plate 14 can be a circular stopper plate 14, and the shape and size of the stopper plate 14 are set to correspond to the shape and size of the cross section of the dialysis catheter 2.

[0069] In some embodiments, the guidewire 1 further includes an adjustment portion 15, which includes a receiving cavity, a conductive coil 151, and a power supply 152. The receiving cavity is disposed within the main body 11 and is filled with a magnetic fluid; the conductive coil 151 is wound around the main body 11; and the power supply 152 is disposed on the limiting plate 14 and electrically connected to the conductive coil 151. The adjustment portion 15 is integrally connected to the main body 11 and the limiting plate 14. When the main body 11 and the limiting plate 14 are withdrawn from the lumen, the adjustment portion 15 is withdrawn from the lumen simultaneously, without affecting the subsequent dialysis operation of the dialysis catheter 2, thereby ensuring the dialysis effect.

[0070] In an embodiment of the present application, the conductive coil 151 can be located on the side of the limiting plate 14 close to the expansion piece 12, or on the side of the limiting plate 14 away from the expansion piece 12; the setting length of the accommodating cavity, the winding length and winding position of the conductive coil 151 can be set according to actual needs, and this application does not limit this.

[0071] In the embodiment of the present application, the conductive coil 151 and the power supply 152 cooperate to form a magnetic field control mechanism. When the power supply 152 is activated and the conductive coil 151 is energized to generate a magnetic field, the magnetic fluid in the accommodating cavity of the main body 11 is arranged and combined under the influence of the magnetic field, forming a chain-like or columnar compact structure. The overall stiffness of the magnetic fluid is increased, thereby increasing the overall stiffness of the main body 11. As the guidewire 1 and the dialysis catheter 2 enter the abdominal incision and pass through the abdominal fat layer, the power supply 152 can be turned on to increase the stiffness of the main body 11, thereby improving the overall puncture ability of the guidewire 1 and the dialysis catheter 2, thereby facilitating their passage through the abdominal fat layer, improving surgical efficiency, and alleviating pain for the patient.

[0072] In the embodiment of the present application, after the guide wire 1 and the dialysis catheter 2 enter the abdominal cavity, the power supply 152 is turned off, the magnetic field is canceled, the stiffness of the main body 11 is reduced, and the design of the expansion piece 12 makes the front end of the guide wire 1 rounded, which can reduce the pressure applied by the front end of the guide wire 1 to the inner wall of the abdominal cavity, reduce the probability of the guide wire 1 scratching the inner peritoneum during the catheterization process, and improve the safety of the operation.

[0073] In the embodiment of the present application, when the number of turns of the conductive coil 151 is constant, according to Ampere's law, the greater the current passing through the conductive coil 151, the stronger the magnetic field generated. The increase in the intensity of the magnetic field enhances the interaction between the magnetic fluid particles and makes the structure of the magnetic fluid more compact. The macroscopic manifestation is that the stiffness of the magnetic fluid increases, thereby increasing the stiffness of the main body 11. Correspondingly, the smaller the current passing through the coil, the smaller the increase in the stiffness of the main body 11. The strength of the magnetic field can be controlled by controlling the magnitude of the current provided by the power supply 152, thereby controlling the stiffness of the magnetic fluid and controlling the stiffness of the main body 11, so that the guide wire 1 can be applied to patients with different fat thicknesses, thereby improving the applicability and reliability of the guide wire 1.

[0074] In this embodiment of the present application, the body 11 is made of polyether block amide (PEBA), and the magnetic fluid comprises carbonyl iron powder-silicone oil magnetic fluid. The capacity of the magnetic fluid within the body 11 is 12 to 20 μL / cm. The conductive coil 151 is made of silver-plated copper microwire, with a diameter of 0.04 to 0.06 mm. The power supply 152 can provide a maximum current of 1.5 A, resulting in a magnetic field with a magnetic induction intensity of 1.2 Tesla.

[0075] In some embodiments, the adjustment unit 15 further includes a first conductive wire 154 and a second conductive wire 155. One end of the first conductive wire 154 is electrically connected to the power source 152, and the other end is electrically connected to one end of the conductive coil 151. One end of the second conductive wire 155 is electrically connected to the power source 152, and the other end is configured to move linearly along the extension direction of the main body 11 to abut different positions on the conductive coil 151. One end of the first conductive wire 154 and the second conductive wire 155 are connected to the positive and negative poles of the power source 152, respectively, and cooperate with the conductive coil 151 to form a current path.

[0076] In the embodiment of the present application, the second conductive wire 155 can move linearly along the extension direction of the main body 11 to abut against different positions on the conductive coil 151, thereby changing the winding length of the conductive coil 151 between the first conductive wire 154 and the second conductive wire 155, and changing the actual number of energized turns of the conductive coil 151. When the current provided by the power supply 152 remains unchanged, the greater the actual number of energized turns of the conductive coil 151, the stronger the magnetic field intensity generated after energization, the greater the stiffness of the magnetic fluid, and thus the greater the stiffness of the main body 11. This allows the guidewire 1 to be applied to patients with different fat thicknesses, thereby improving the applicability and reliability of the guidewire 1.

[0077] In the embodiment of the present application, when the conductive coil 151 is arranged on the side of the limiting plate 14 close to the expansion piece 12, after the guide wire is connected to the dialysis catheter 2, the conductive coil 151 is placed in the lumen. At this time, the second wire 155 can pass through the limiting plate 14 and be placed outside the dialysis catheter 2, so as to adjust the contact position of the second wire 155 and the conductive coil 151 and adjust the actual number of energized turns of the conductive coil 151.

[0078] In some embodiments, as Figure 5 、 Figure 6 and Figure 7 As shown, the main body 11 includes a first section 111 and a second section 112, the first section 111 is connected to the expansion piece 12, and the second section 112 is connected to the limit plate 14; the adjustment part 15 also includes an elastic member 153, and the elastic member 153 is arranged between the first section 111 and the second section 112; the conductive coil 151 is wound around the second section 112 and is located on the side of the limit plate 14 close to the expansion piece 12; the power supply 152 is arranged on the limit plate 14; one end of the first wire 154 is electrically connected to the power supply 152, and the other end is electrically connected to the end of the conductive coil 151; one end of the second wire 155 is electrically connected to the power supply 152, and the other end is in contact with the surface of the conductive coil 151.

[0079] In the embodiment of the present application, after the expansion member 12 is expanded and the catheter is placed, a thrust is continuously applied to the first section 111 of the main body 11. The first section 111 compresses the elastic member 153, causing it to move toward the second section 112, thereby driving the conductive coil 151 connected to the first section 111 to move away from the limiting plate 14. During this process, the first conductive wire 154 has a redundant section to provide it with movement margin, allowing one end of the first conductive wire 154 to move synchronously with the conductive coil 151, ensuring the formation of a current path. One end of the second conductive wire 155 is connected to the power source 152. The second conductive wire 155 is covered with a shell, making the second conductive wire 155 rigid as a whole. The movement of the first section 111 and the conductive coil 151 will not affect the position and shape of the second conductive wire 155.

[0080] In the embodiment of the present application, the conductive coil 151 moves in a direction away from the limiting plate 14, the end of the first wire 154 connected to it follows the movement, and the second wire 155 does not move. The distance between the end of the second wire 155 abutting the conductive coil 151 and the end of the first wire 154 connected to the conductive coil 151 increases, the actual number of energized turns of the conductive coil 151 increases, the magnetic field is enhanced, and the stiffness of the main body 11 is increased in conjunction with the magnetic fluid, which helps the guide wire 1 to cooperate with the dialysis catheter 2 to pass through the excessively thick fat layer of obese patients, thereby improving the efficiency of the operation.

[0081] In the embodiment of the present application, after the guide wire 1 cooperates with the dialysis catheter 2 to pass through a thicker fat layer, the thrust applied to the main body 11 is appropriately reduced, and the first section 111 moves in a direction away from the second section 112 under the action of the elastic member 153, and the conductive coil 151 moves in a direction close to the limit plate 14. The distance between the end of the second wire 155 abutting the conductive coil 151 and the end of the first wire 154 connected to the conductive coil 151 is reduced, the actual number of energized turns of the conductive coil 151 is reduced, and the stiffness of the main body 11 is reduced, which can reduce the pressure applied to the inner wall of the abdominal cavity by the front end of the guide wire 1, reduce the probability of the guide wire 1 scratching the inner peritoneum during the catheterization process, and improve the safety of the operation.

[0082] In the embodiment of the present application, the elastic member 153 may be a spring, and the material of the elastic member 153 includes a superelastic nickel-titanium alloy. Two guide plates 156 are provided on the conductive coil 151, which are parallel to each other and extend in a direction parallel to the main body 11. The end of the second conductive wire 155 that abuts the conductive coil 151 is located between the two guide plates 156. The guide plate 156 can guide the movement of the second conductive wire 155 relative to the conductive coil 151, thereby improving the abutment stability of the second conductive wire 155 and the conductive coil 151, reducing the probability of disconnection between the second conductive wire 155 and the conductive coil 151, improving the stiffness adjustment stability of the main body 11, and improving the operating stability of the guidewire 1.

[0083] In some embodiments, as Figure 11 and Figure 13 As shown, the guidewire 1 further includes an ultrasonic probe 17, which is disposed within the expansion cavity 121 and located at the end of the expansion member 12 away from the main body 11. The ultrasonic probe 17 can be used in conjunction with ultrasonic imaging technology to locate the head 123 of the guidewire 1, thereby achieving real-time visual guidance of the guidewire 1 and the dialysis catheter 2. This allows the doctor to clearly observe the position of the expansion member 12 during the operation, thereby determining the position of the dialysis catheter 2, and facilitating rapid and efficient placement of the dialysis catheter 2 into the lowest position of the abdominal cavity (such as the vesicorectal fossa). This reduces operational difficulty, improves surgical efficiency, and reduces the dependence of the operation on the doctor's experience. It can also reduce abdominal cavity contamination caused by repeated adjustments to the catheter position due to blind insertion, thereby reducing the probability of infectious complications such as peritonitis.

[0084] In some embodiments, a handle 16 is provided at one end of the main body 11 away from the expansion piece 12 to facilitate the doctor to apply pushing or pulling force to the main body 11 during the catheterization process, thereby improving the insertion and extraction efficiency of the guide wire 1.

[0085] The embodiment of the second aspect of the present application provides a catheter placement device, including the peritoneal dialysis catheter placement guide wire 1 in any of the above embodiments, such as Figure 8 、 Figure 10 and Figure 12 As shown, the catheterization device also includes a dialysis catheter 2, into which a guidewire 1 is inserted. The guidewire 1 comprises a main body 11, an expansion member 12, and a support member 13. The expansion member 12 is disposed at one end of the main body 11 and has an expansion cavity 121. The support member 13 is used to connect the main body 11 and the expansion member 12 and to expand or contract the expansion member 12. A portion of the expansion member 12 is disposed within the dialysis catheter 2, while the other portion extends from the end of the dialysis catheter 2.

[0086] In the embodiment of the present application, after the guide wire 1 is connected to the dialysis catheter 2, part of the structure of the expansion piece 12 extends out of the dialysis catheter 2, and the expansion piece 13 is used to put the expansion piece 12 in an expanded state. The volume of the expansion piece 12 increases, and the shape of the head of the guide wire 1 changes. At this time, the guide wire 1 can cooperate with the dialysis catheter 2 to pass through the patient's abdominal incision for catheterization. During the catheterization operation, the expanded expansion piece 12 first contacts the patient's skin texture. The increase in the volume of the expansion piece 12 can increase the contact area of the head of the guide wire 1 with the peritoneum, intestines or blood vessels during the operation, buffer the pressure applied to the peritoneum, intestines or blood vessels by the guide wire 1 during the operation, reduce the probability of the guide wire 1 scratching or puncturing the peritoneum, intestines or blood vessels, improve the safety of the operation, and also reduce the requirements for the doctor's experience and reduce the difficulty of the operation.

[0087] In this embodiment, the dialysis catheter 2 is made of polyurethane (PU). Polyurethane has advantages such as good biocompatibility and flexibility, making it suitable for long-term indwelling dialysis catheters. The smooth surface of the dialysis catheter 2 reduces the risk of thrombosis and improves dialysis effectiveness and safety. The outer diameter of the dialysis catheter 2 is greater than or equal to 8 mm and less than or equal to 9 mm.

[0088] In some embodiments, as Figure 11 and Figure 13 As shown, the end of the expansion member 12 close to the main body 11 is provided with a first limiting ring 122, which is arranged around the outer wall of the expansion member 12; the inner wall of the end of the dialysis catheter 2 is provided with a second limiting ring 21, and along the extension direction of the dialysis catheter 2, the projection of the first limiting ring 122 and the projection of the second limiting ring 21 partially overlap. When the expansion member 12 moves to the end of the dialysis catheter 2, the first limiting ring 122 abuts against the second limiting ring 21, and the second limiting ring 21 can block the expansion member 12, hindering the further advancement of the guide wire 1, preventing the guide wire 1 from detaching from the catheter and continuing to extend into the abdominal cavity during the catheterization process, reducing the probability of damage to the patient's abdominal cavity wall due to excessive puncture, and improving the safety of the operation.

[0089] In some embodiments, as Figure 8 、 Figure 9 and Figure 10 As shown, a pressure plate 22 is provided on the outer wall of the end of the dialysis catheter 2 away from the expansion member 12. The pressure plates 22 can be symmetrically positioned on either side of the dialysis catheter 2. When inserting the guidewire 1, the thumb presses the handle 16 at one end of the main body 11, while the index and middle fingers press against the back of the pressure plates 22. This facilitates applying thrust to the guidewire 1, adjusting the thrust in real time, and maintaining a stable thrust. This ensures that the guidewire 1 and the dialysis catheter 2 remain relatively stationary during insertion, improving the stability of the insertion procedure.

[0090] In the embodiment of the present application, a limiting groove is provided on the pressing plate 22, and the limiting protrusion 141 on the limiting plate 14 can also be engaged with the limiting groove. This can reduce the probability of the limiting plate 14 and the main body 11 connected thereto shaking relative to the dialysis catheter 2 during the catheterization operation without affecting the insertion and withdrawal of the main body 11, thereby improving the connection stability between the guide wire 1 and the dialysis catheter 2 and improving the stability of the catheterization operation.

[0091] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0092] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A guide wire (1) for peritoneal dialysis catheter placement, characterized in that: The invention comprises a main body (11), an expansion piece (12) and an expansion piece (13); the expansion piece (12) is arranged at one end of the main body (11) and has an expansion cavity (121); the expansion piece (13) is used to connect the main body (11) and the expansion piece (12) and to expand or contract the expansion piece (12).

2. The peritoneal dialysis catheter guide wire (1) according to claim 1, characterized in that: The expansion member (12) includes a head portion (123), an expandable support portion (124), and a tail portion (125) which are sequentially arranged in a direction close to the main body (11); A side surface of the head portion (123) away from the tail portion (125) is a curved surface; The expandable portion (124) is provided with a plurality of folding portions (1241), and the expansion member (13) is used to expand or fold the plurality of folding portions (1241); The tail portion (125) is provided with a first limiting ring (122), and the first limiting ring (122) is arranged around the outer wall of the tail portion (125).

3. The peritoneal dialysis catheter guide wire (1) according to claim 2, characterized in that: The expansion member (13) includes a plurality of expansion frames that are evenly and spaced apart, and the expansion frame portion is placed in the expansion cavity (121). Each expansion frame includes a hinged first expansion rod (131) and a second expansion rod (132). One end of the first expansion rod (131) and the second expansion rod (132) is hinged to the expandable portion (124). The other end of the first expansion rod (131) is hinged to the main body (11), and the other end of the second expansion rod (132) is hinged to the head (123).

4. The peritoneal dialysis catheter guide wire (1) according to claim 1, characterized in that: It also includes a limiting plate (14), which is connected to the main body (11), and a limiting protrusion (141) is provided on the periphery of one side of the limiting plate (14) close to the expansion piece (12).

5. The peritoneal dialysis catheter guide wire (1) according to claim 4, characterized in that: It also includes an adjustment portion (15), the adjustment portion (15) include: A receiving cavity is provided inside the main body (11), and the receiving cavity is filled with magnetic fluid; A conductive coil (151) is wound around the main body (11); The power supply (152) is disposed on the limiting plate (14) and is electrically connected to the conductive coil (151).

6. The peritoneal dialysis catheter guide wire (1) according to claim 5, characterized in that: The adjustment portion (15) further includes a first wire (154) and a second wire (155), wherein one end of the first wire (154) is electrically connected to the power source (152), and the other end is electrically connected to one end of the conductive coil (151); and one end of the second wire (155) is electrically connected to the power source (152), and the other end is configured to move linearly along the extension direction of the main body (11) to abut against different positions on the conductive coil (151).

7. The peritoneal dialysis catheter guide wire (1) according to claim 1, characterized in that: It also includes an ultrasonic probe (17), which is arranged in the expansion cavity (121) and is located at an end of the expansion member (12) away from the main body (11).

8. The peritoneal dialysis catheter guide wire (1) according to claim 1, characterized in that: The expansion member (12) is formed of a flexible material, and the flexible material includes a silicone material.

9. A catheter placement device, comprising the peritoneal dialysis catheter placement guide wire (1) according to any one of claims 1 to 8, characterized in that: It also includes a dialysis catheter (2), wherein the guide wire (1) is inserted into the dialysis catheter (2); The guide wire (1) comprises a main body (11), an expansion piece (12) and an expansion piece (13); the expansion piece (12) is arranged at one end of the main body (11) and has an expansion cavity (121); the expansion piece (13) is used to connect the main body (11) and the expansion piece (12) and to expand or contract the expansion piece (12); A portion of the expansion piece (12) is placed inside the dialysis catheter (2), and another portion extends from the end of the dialysis catheter (2).

10. The catheter placement device according to claim 9, characterized in that: A first limiting ring (122) is provided at one end of the expansion piece (12) close to the main body (11), and the first limiting ring (122) is wound around the outer wall of the expansion piece (12); A second limiting ring (21) is provided on the inner wall of the end of the dialysis catheter (2), and along the extension direction of the dialysis catheter (2), the projection of the first limiting ring (122) and the projection of the second limiting ring (21) partially overlap.

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