Micro-diameter flexible joint for peritoneal dialysis catheter

Abstract

The utility model relates to the technical field of medical instruments, in particular to a micro-diameter flexible joint for a peritoneal dialysis catheter, which comprises a near-end joint and a far-end joint which are connected with each other, the near-end joint is connected with a base, and both the near-end joint and the far-end joint are of bendable structures; the near-end joint is connected with a plurality of first bending deformation transmission strips, the first bending deformation transmission strips extend out of the base, the near-end joint can be bent by pushing and pulling the first bending deformation transmission strips, the far-end joint is connected with a plurality of second bending deformation transmission strips, and the second bending deformation transmission strips penetrate through the near-end joint and then extend out of the base. The far-end joint can be bent by pushing and pulling the second bending deformation transmission strip; the diameter of the flexible joint is smaller than or equal to 2.2 mm, and the length of the flexible joint ranges from 140 mm to 200 mm. According to the micro-diameter auxiliary device for the peritoneal dialysis catheter operation, the position of a peritoneal dialysis catheter can be conveniently adjusted, and abdominal pain catheter dysfunction is relieved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical instruments, in particular to a micro-diameter auxiliary device for peritoneal dialysis catheter surgery. Background Art

[0002] According to the Chinese Kidney Disease Data Registry, by the end of 2020, more than 800,000 people in my country were receiving dialysis treatment, with annual dialysis treatment costs exceeding 50 billion. Peritoneal dialysis (PD) is one of the important renal replacement therapies for patients with end-stage renal disease. As a home treatment method, its efficacy and cost advantages in the treatment of end-stage renal disease are increasingly gaining attention.

[0003] Peritoneal dialysis catheter dysfunction (peritoneal dialysis catheter blockage, displacement) and peritoneal failure are two important reasons for the failure of peritoneal dialysis treatment.

[0004] Dysfunction of the peritoneal dialysis catheter will directly and seriously affect the effect of peritoneal dialysis treatment. The current solutions mainly include blind reduction, surgical reduction and peritoneoscopic reduction. However, these reduction methods have low success rates and increase surgical trauma and anesthesia risks.

[0005] Peritoneal failure is caused by various factors that change the peritoneal tissue structure of peritoneal dialysis patients after long-term dialysis, leading to peritoneal failure and forcing patients to quit peritoneal dialysis. Peritoneal biopsy can solve this problem. Peritoneal biopsy dynamically observes the changes in peritoneal morphology and pathology, and takes appropriate intervention measures as early as possible to avoid peritoneal failure. However, it is difficult to observe the peritoneum in a minimally invasive manner in reality, making it difficult to promote in clinical practice.

[0006] There are some technologies with single joint passive bending function in the prior art, such as the technical solution disclosed in US Pat. No. 20030069522A1. The wire core shaft 333 can also be used to change the curvature of the tubular wire 320 according to the needs of the user. For example, the tubular guide wire 320 can form its curved or inclined part (such as the curved distal end 340 to be discussed temporarily), and then the straight wire core shaft 333 can be inserted into the guide wire to straighten it, and then removed when necessary to allow the guide wire to restore the curved shape. This bending function is very limited, and it is difficult to achieve flexible operation and accurate positioning of the peritoneal dialysis catheter in the abdominal cavity. At the same time, there is also a lack of feedback of in vivo information when performing peritoneal dialysis catheterization surgery, which also increases the difficulty of operating and positioning the peritoneal dialysis catheter in the body.

[0007] In addition, the Chinese patent document CN116277142A applied by Peking University discloses a flexible dual-joint robot with multiple degrees of freedom and flexible operation, which consists of a proximal joint and a distal joint, and has the characteristics of high operational flexibility and precise control under small-scale requirements. However, its flexible joint includes a hollow drive backbone with a compression spring, which has a complex structure and a large size, and is not suitable for operation in a narrow peritoneal dialysis catheter in the field of peritoneal dialysis. Therefore, it is necessary to propose a new technical solution to solve the above problems. Utility Model Content

[0008] 1. Technical issues to be resolved

[0009] The utility model aims to provide a micro-diameter auxiliary device for peritoneal dialysis catheter surgery, aiming to solve the problem in the prior art that it is difficult to realize flexible operation and accurate positioning of the peritoneal dialysis catheter in the body.

[0010] (II) Technical solution

[0011] In order to achieve the above-mentioned purpose, the utility model provides a micro-diameter flexible joint for a peritoneal dialysis catheter, comprising a proximal joint and a distal joint that are connected to each other and independently controlled, wherein the proximal joint and the distal joint both comprise an elastic hose and a plurality of support blocks that are arranged inside the elastic hose, spaced apart along the length direction, and provide radial support to the elastic hose;

[0012] It also includes a joint middle fixing piece arranged at the connection between the proximal joint and the distal joint; and a joint end fixing piece arranged at the end of the distal joint;

[0013] The joint middle fixing piece and the support block are both provided with a plurality of first through holes and a second through hole;

[0014] A plurality of first bending deformation transmission strips are passed through the plurality of first through holes of the plurality of support blocks one by one from one end of the proximal joint and then fixed to the joint middle fixing member, and pushing and pulling the first bending deformation transmission strips can cause the proximal joint to bend;

[0015] A plurality of second bending deformation transmission strips are passed through the second through holes of the plurality of support blocks of the proximal joint, the plurality of first through holes of the plurality of support blocks of the distal joint and the plurality of first through holes of the joint middle fixing piece from one end of the proximal joint, and then fixed to the joint end fixing piece. Pushing and pulling the second bending deformation transmission strips can cause the distal joint to bend.

[0016] The maximum diameter of the flexible joint is less than or equal to 2.2 mm.

[0017] Preferably, the joint middle fixing piece is a cylinder matching the outer diameter of the elastic hose, the support block is a cylinder matching the inner diameter of the elastic hose, and the multiple first through holes penetrate along the length direction of the cylinder and are evenly distributed circumferentially on its end surface.

[0018] Preferably, the number of the first bending deformation transmission strips and the number of the second bending deformation transmission strips are both more than three and they are distributed circumferentially.

[0019] Preferably, the first bending deformation transfer strip and the second bending deformation transfer strip are driving wires or tension springs respectively.

[0020] Preferably, a hollow support spring is included in the proximal joint and / or the distal joint, and the support spring is located in an inner space defined by the circumferentially distributed drive wires.

[0021] Preferably, the support block in the proximal joint is provided with a second through hole located at a central position, and the support spring passes through the second through hole.

[0022] Preferably, a support spring connected between a joint middle fixing piece and a joint end fixing piece is included in the distal joint, and the support spring is located in an internal space defined by the second bending deformation transfer strip.

[0023] Preferably, the support block in the distal joint is provided with a second through hole located at a central position, and the support spring passes through the second through hole.

[0024] Preferably, a visual module is connected to the end of the flexible joint.

[0025] Preferably, the joint middle fixing piece and the support block are both provided with a second through hole at the center, and the wires of the visual module extend out after passing through the plurality of second through holes.

[0026] Furthermore, the visual module uses the OVM 6984 endoscope module and integrates the light source, and its diameter is 0.7-0.8mm

[0027] Furthermore, the flexible joint is directly connected to the base, and a multi-lumen flexible catheter is connected between the base and the flexible joint. The multi-lumen flexible catheter is provided with multiple lumens extending along its axial direction, and the first curved deformation transfer strip and the second curved deformation transfer strip pass through the lumens.

[0028] Furthermore, the diameter of the multi-lumen flexible catheter is less than 2.2 mm, and the length of the multi-lumen flexible catheter is 40-100 mm.

[0029] (III) Beneficial effects

[0030] The micro-diameter flexible joint for peritoneal dialysis catheter surgery provided by the utility model can control the maximum size of the joint within 2.2 mm, meeting the restriction requirements of the internal space of the peritoneal dialysis catheter. When in use, the flexible joint is inserted into the peritoneal dialysis catheter. The size of the flexible joint is adapted to the common peritoneal dialysis catheters currently on the market. The flexible joint can be bent by pushing and stretching the bending deformation transmission strip outside the base. During the catheterization process, the flexible joint drives the peritoneal dialysis catheter to bend so that the peritoneal dialysis catheter can bend and move forward in the patient's body to avoid the peritoneal dialysis catheter being blocked by the organs and unable to be placed in place. Since the flexible joint is set to bend in two sections, this allows the flexible joint to have a high degree of freedom and can perform complex bending; when the peritoneal dialysis catheter is blocked, the flexible joint can also clear the peritoneal dialysis catheter.

[0031] In a preferred embodiment, a visual module is provided at the end of the flexible joint, through which the situation in the patient's abdominal cavity can be observed. The multi-degree-of-freedom bending characteristics of the flexible joint can effectively avoid organs in the narrow abdominal cavity to effectively place the catheter; the visual module can also intuitively observe whether the peritoneal dialysis catheter is blocked; and it can also observe the situation of the peritoneum at multiple angles and points in the patient's abdominal cavity to achieve peritoneal biopsy.

[0032] Therefore, this micro-diameter auxiliary device used for peritoneal dialysis catheter surgery can adjust the position of the peritoneal dialysis catheter and relieve the dysfunction of the peritoneal dialysis catheter in a minimally invasive and visual manner. It can also perform peritoneal biopsy according to clinical needs and take timely intervention measures, thereby reducing the failure rate of peritoneal dialysis treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a three-dimensional structural diagram of the micro-diameter auxiliary device for peritoneal dialysis catheter surgery of the utility model;

[0034] Figure 2 The utility model is a decomposition structure of a micro-diameter auxiliary device for peritoneal dialysis catheter surgery. Figure 1 ;

[0035] Figure 3 The utility model is a decomposition structure of a micro-diameter auxiliary device for peritoneal dialysis catheter surgery. Figure 2 ;

[0036] Figure 4 The utility model is a decomposition structure of a micro-diameter auxiliary device for peritoneal dialysis catheter surgery. Figure 3 ;

[0037] Figure 5 It is a breakdown structure diagram of a flexible joint;

[0038] Figure 6 yes Figure 5 A partial enlarged view of part A;

[0039] Figure 7 yes Figure 5 A partial enlarged view of part B;

[0040] Figure 8 It is a three-dimensional structural diagram of the support block.

[0041] [Description of Reference Numerals]

[0042] 1. Base;

[0043] 2. Flexible joint; 21. Proximal joint; 22. Distal joint; 23. Middle joint fixing piece; 24. End joint fixing piece; 25. Support block; 26. Support spring; 27. Elastic hose;

[0044] 3. Multi-lumen flexible catheter;

[0045] 4. A first bending deformation transfer strip;

[0046] 5. Second bending deformation transfer strip;

[0047] 6. Visual module. DETAILED DESCRIPTION

[0048] The present invention is described in detail below in conjunction with specific embodiments.

[0049] In the present invention, unless otherwise specified and limited, when terms such as "disposed on", "connected" and "connected" appear, these terms should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can also be a mechanical connection; it can be directly connected, or connected through an intermediate medium, or the two elements can be internally connected. Unless there is a specific description of a specific connection relationship.

[0050] Please refer to Figures 1 to 8 The present embodiment provides a micro-diameter auxiliary device for peritoneal dialysis catheter surgery, which includes a base 1 and a flexible joint 2; the flexible joint 2 includes a connected proximal joint 21 and a distal joint 22, the proximal joint 21 is connected to the base 1, and the proximal joint 21 and the distal joint 22 are both bendable structures; the proximal joint 21 is connected to a plurality of first bending deformation transmission strips 4, the first bending deformation transmission strips 4 extend from the base 1, and pushing and pulling the first bending deformation transmission strips 4 can bend the proximal joint 21, and the distal joint 22 is connected to a plurality of second bending deformation transmission strips 5, the second bending deformation transmission strips 5 extend from the base 1 after passing through the proximal joint 21, and pushing and pulling the second bending deformation transmission strips 5 can bend the distal joint 22; the diameter of the flexible joint 2 is less than 2.2 mm, and the length of the flexible joint 2 is 140-200 mm.

[0051] When the micro-diameter auxiliary device for peritoneal dialysis catheter surgery is used, the flexible joint 2 is inserted into the peritoneal dialysis catheter. The size of the flexible joint 2 is adapted to the common peritoneal dialysis catheters currently on the market. The flexible joint 2 is bent by pushing and pulling the bending deformation transmission strip. During the catheter placement process, the flexible joint 2 drives the peritoneal dialysis catheter to bend so that the peritoneal dialysis catheter can bend and advance in the patient's body to avoid the peritoneal dialysis catheter being blocked by the internal organs and unable to be placed in place. Moreover, since the flexible joint 2 is set to bend in two sections, the flexible joint 2 has a high degree of freedom and can perform complex bending. When the peritoneal dialysis catheter is blocked, the flexible joint 2 can also clear the peritoneal dialysis catheter.

[0052] Regarding the operation of the flexible joint 2, there are various devices in the prior art for pushing and pulling the bending deformation transfer strip, which are not described in detail in this embodiment.

[0053] Please refer to Figures 1 to 4 In this embodiment, a joint middle fixing part 23 is provided at the connection between the proximal joint 21 and the distal joint 22, one end of the first bending deformation transmission strip 4 is connected to the joint middle fixing part 23 and the other end extends out of the base 1; a joint end fixing part 24 is provided at the end of the distal joint 22, one end of the second bending deformation transmission strip 5 is connected to the joint end fixing part 24 and the other end extends out of the base 1; the joint middle fixing part 23 is provided with a guide hole for the second bending deformation transmission strip 5 to pass through. Based on the above structural setting, two sets of bending deformation transmission mechanisms are formed to realize the function of two-stage bending.

[0054] Please refer to Figures 5 to 8 In this embodiment, the proximal joint 21 and the distal joint 22 both include an elastic hose 27 and a plurality of support blocks 25 disposed inside the elastic hose 27. The support blocks 25 are provided with through holes, through which the first bending deformation transmission strip 4 and the second bending deformation transmission strip 5 pass. The elastic hose 27 wraps all the bending deformation transmission strips and the wires of the visual module 6 described below, making the surface of the entire flexible joint 2 smooth and preventing external impurities from affecting the operation of the bending deformation transmission strips and the wires. The support blocks 25 are used to support the elastic hose 27 and also provide guidance for the bending deformation transmission strips. Providing more support blocks 25 can also improve the accuracy of bending deformation transmission.

[0055] In this embodiment, the number of the first bending deformation transmission strips 4 and the second bending deformation transmission strips 5 is more than three and they are distributed circumferentially. When the number of the first bending deformation transmission strips 4 and the second bending deformation transmission strips 5 is more than three, the proximal joint 21 and the distal joint 22 can be respectively rotated 360 degrees, so that the proximal joint 21 and the distal joint 22 have sufficient degrees of freedom. Of course, it is also possible to set more first bending deformation transmission strips 4 and second bending deformation transmission strips 5, so that the accuracy of bending transmission can be improved.

[0056] In this embodiment, the first bending deformation transmission strip 4 is a tension spring. The tension spring has good bending characteristics and overall stiffness, can provide push-pull and support functions at the same time, can effectively achieve accurate positioning of the peritoneal dialysis catheter, and because of its internal channel characteristics, can also be used as a driving channel when the first bending deformation transmission strip 4 passes through the proximal joint 21, thereby realizing the combination of these two sections of bending design mechanisms and simplifying the structure.

[0057] The second bending deformation transmission strip 5 is a driving wire, and the driving wire passes through a tension spring; the driving wire has a small diameter, which is beneficial to reducing the overall diameter of the flexible joint 2. A support spring 26 is connected between the middle joint fixture 23 and the end joint fixture 24. Since the driving wire can mainly transmit tensile force but has little effect on the transmission of thrust, a support spring 26 is set in the distal joint 22 as a supporting skeleton so that the distal joint 22 can be bent accurately. The above-mentioned first bending deformation transmission strip 4 uses a tension spring, the second bending deformation transmission strip 5 uses a driving wire, and the setting that the driving wire passes through the tension spring can effectively meet the multi-degree-of-freedom requirements and miniaturization requirements of the flexible joint 2, and also avoid mutual interference between the proximal joint 21 and the distal joint 22 during movement.

[0058] Of course, the first bending deformation transmission strip 4 can also be a driving wire, and its two ends are respectively fixed to the middle joint fixing part 23 and the middle handle fixing part 33. At the same time, a support spring is connected inside the proximal joint 21 and between the middle joint fixing part 23 and the middle handle fixing part 33, and the driving wire is distributed therein or around it. The first bending deformation transmission strip 4 and the second bending deformation transmission strip 5 are physically isolated by the support spring in this section to avoid mutual interference.

[0059] Of course, the second bending deformation transmission strip 5 can also be a tension spring.

[0060] In this embodiment, the end of the flexible joint 2 is connected to a visual module 6. Preferably, the visual module 6 adopts an OVM6984 endoscope module and integrates a light source, and its diameter is 0.7-0.8 mm; the wire of the visual module 6 passes through the proximal joint 21 and the distal joint 22 and then extends from the base 1. The visual module 6 can observe the situation in the patient's abdominal cavity, and with the help of the multi-degree-of-freedom bending characteristics of the flexible joint 2, it can efficiently avoid the organs in the narrow abdominal cavity to efficiently place the catheter; the visual module 6 can also intuitively observe whether the peritoneal dialysis catheter is blocked; and it can also observe the situation of the peritoneum at multiple angles and multiple points in the patient's abdominal cavity to achieve peritoneal biopsy.

[0061] Please refer to Figures 1 to 4In this embodiment, a multi-lumen flexible catheter 3 is connected between the base 1 and the flexible joint 2. A plurality of cavities extending along its axial direction are arranged inside the multi-lumen flexible catheter 3, and a first curved deformation transmission strip 4 and a second curved deformation transmission strip 5 pass through the cavities. The multi-lumen flexible catheter 3 is used to open the distance between the flexible joint 2 and the base 1, increase the depth of the flexible joint 2 extending into the human abdominal cavity, and mainly control the end of the peritoneal dialysis catheter in actual use. The diameter of the multi-lumen flexible catheter 3 is less than 2.2mm, and the length of the multi-lumen flexible catheter 3 is 40-100mm. The above-mentioned size setting makes the multi-lumen flexible catheter 3 match the common peritoneal dialysis catheters on the market, and has strong applicability.

[0062] In summary, this micro-diameter auxiliary device for peritoneal dialysis catheter surgery can adjust the position of the peritoneal dialysis catheter in a minimally invasive and visual manner, relieve the dysfunction of the peritoneal catheter, perform peritoneal biopsy according to clinical needs, and take timely intervention measures, thereby reducing the failure rate of peritoneal dialysis treatment.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit the protection scope of the utility model. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the utility model.

Claims

1. A micro-diameter flexible joint for a peritoneal dialysis catheter, characterized in that: The invention comprises a proximal joint (21) and a distal joint (22) which are connected to each other and are independently controlled, wherein the proximal joint (21) and the distal joint (22) each comprise an elastic hose (27) and a plurality of support blocks (25) which are arranged inside the elastic hose (27) and are spaced apart along the length direction to provide radial support for the elastic hose; It also includes a joint middle fixing piece (23) arranged at the connection between the proximal joint (21) and the distal joint (22); and a joint end fixing piece (24) arranged at the end of the distal joint (22); The joint middle fixing piece and the support block are both provided with a plurality of first through holes and a second through hole; A plurality of first bending deformation transmission strips (4) are passed through the plurality of first through holes of the plurality of support blocks one by one from one end of the proximal joint (21) and are then fixed to the joint middle fixing member, and pushing and pulling the first bending deformation transmission strips (4) can cause the proximal joint (21) to bend; A plurality of second bending deformation transmission strips (5) are passed through the second through holes of the plurality of support blocks of the proximal joint, the plurality of first through holes of the plurality of support blocks of the distal joint and the plurality of first through holes of the joint middle fixing piece from one end of the proximal joint (21) and are then fixed to the joint end fixing piece (24). Pushing and pulling the second bending deformation transmission strips (5) can cause the distal joint (22) to bend. The maximum diameter of the flexible joint (2) is less than or equal to 2.2 mm.

2. The micro-diameter flexible joint for peritoneal dialysis catheter according to claim 1, characterized in that: The joint middle fixing piece is a cylinder matching the outer diameter of the elastic hose, the support block is a cylinder matching the inner diameter of the elastic hose, and the multiple first through holes penetrate along the length direction of the cylinder and are evenly distributed circumferentially on its end surface.

3. The micro-diameter flexible joint for peritoneal dialysis catheter according to claim 1, characterized in that: The number of the first bending deformation transmission strips (4) and the number of the second bending deformation transmission strips (5) are both more than three and they are distributed in a circumferential manner.

4. The micro-diameter flexible joint for peritoneal dialysis catheter according to claim 2, characterized in that: The first bending deformation transmission strip (4) and the second bending deformation transmission strip (5) are respectively drive wires or tension springs.

5. The micro-diameter flexible joint for peritoneal dialysis catheter according to claim 4, characterized in that: A hollow support spring is included in the proximal joint and / or the distal joint, and the support spring is located in an inner space defined by the circumferentially distributed drive wires.

6. The micro-diameter flexible joint for peritoneal dialysis catheter according to claim 5, characterized in that: The support block in the proximal joint is provided with a second through hole located at a central position, and the support spring passes through the second through hole.

7. The micro-diameter flexible joint for peritoneal dialysis catheter according to claim 4, characterized in that: A support spring connected between a joint middle fixing piece (23) and a joint end fixing piece (24) is included in the distal joint, and the support spring is located in the internal space defined by the second bending deformation transmission strip (5).

8. The micro-diameter flexible joint for peritoneal dialysis catheter according to claim 7, characterized in that: The support block in the distal joint is provided with a second through hole located at a central position, and the support spring passes through the second through hole.

9. The micro-diameter flexible joint for peritoneal dialysis catheter according to claim 1, characterized in that: The end of the flexible joint (2) is connected with a vision module (6).

10. The micro-diameter flexible joint for peritoneal dialysis catheter according to claim 9, characterized in that: The joint middle fixing piece and the support block are both provided with a second through hole located at a central position, and the wires of the visual module (6) extend out after passing through the plurality of second through holes.

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