Puncture sampling catheter
By optimizing the structural design of the puncture sampling catheter, including the coordinated operation of the main tube, inner needle assembly, rotating handle, and sealing cap, the problems of sealing, flexibility, and depth control of existing catheters have been solved, achieving highly accurate and safe sampling operations.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- QINGDAO UNITED FAMILY HOSPITAL CO LTD
- Filing Date
- 2025-04-21
- Publication Date
- 2026-06-26
AI Technical Summary
Existing puncture sampling catheters suffer from insufficient sealing performance, lack of structural flexibility, unreasonable catheter opening design, and lack of depth control mechanisms, resulting in low sampling accuracy, inflexible operation, and increased risk of infection and tissue damage.
A puncture sampling catheter was designed, comprising a main tube body, an inner needle assembly, a rotating handle, a sealing cap, and a fixing seat. The inclined opening, the sealing cap, and the fixing seat work together to form a sealed structure. The inner needle assembly can slide and rotate. The rotating handle is ergonomic. The main tube body is equipped with scale lines to control the puncture depth.
It improves the accuracy and flexibility of puncture sampling, reduces tissue damage, ensures sampling quality and safety, and reduces the risk of infection.
Smart Images
Figure CN224403688U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of puncture sampling catheter technology, and specifically relates to a puncture sampling catheter. Background Technology
[0002] Biopsy, a crucial diagnostic tool in clinical medicine, plays an irreplaceable role in the diagnosis of many diseases. By inserting a catheter deep into human tissue to accurately obtain samples and send them to the laboratory for pathological examination, this process provides doctors with vital diagnostic information. Especially in tumor diagnosis, accurate biopsy results directly affect the formulation and implementation of subsequent treatment plans, profoundly impacting patients' quality of life and prognosis. In the differential diagnosis of infectious diseases, it helps doctors quickly identify the type of pathogen, enabling timely and targeted treatment measures to effectively control disease progression.
[0003] Currently, most commercially available puncture sampling catheters consist primarily of two core components: the needle tube and the inner needle. In practice, doctors rely on their experience to gradually advance the needle tube to the target tissue area and then extract the sample. However, this traditional design has revealed a series of problems that urgently need to be addressed in practical applications. First, the sealing performance between the needle tube and the inner needle is severely flawed. During puncture, due to the lack of an effective sealing mechanism, bodily fluids are prone to leakage, which can not only contaminate surrounding tissues but also cause the sample to be interfered with by external substances, seriously affecting the sampling quality. Simultaneously, the entry of air disrupts the original sterile environment, increasing the risk of infection and creating potential problems for subsequent diagnosis and treatment. Second, the overall structure of the catheter lacks flexibility. In the complex environment of human tissue, doctors often need to flexibly adjust the angle and direction of the needle according to the actual situation to ensure accurate sample acquisition from the lesion site. However, existing catheter designs cannot meet this requirement, imposing many limitations on doctors during operation, leading to a significant reduction in sampling accuracy and increasing the likelihood of missed or misdiagnosed cases. Third, the design of the catheter opening is not reasonable enough. Traditional opening methods can easily cause secondary damage to surrounding tissues during puncture, increasing patient discomfort and potentially affecting the integrity of tissue samples, thus interfering with the accuracy of pathological examination results. Fourth, existing puncture sampling catheters generally lack reliable depth control mechanisms. Doctors rely primarily on touch and experience to judge puncture depth during the procedure, which undoubtedly increases the uncertainty of the operation. If the puncture is too deep, it can easily lead to serious complications such as blood vessel rupture and organ damage, posing a significant safety risk to the patient. Utility Model Content
[0004] In view of this, the puncture sampling catheter provided by this utility model solves the technical problems of low sampling accuracy and inflexible operation of the existing puncture sampling catheters.
[0005] This utility model is implemented as follows:
[0006] This utility model provides a puncture sampling catheter, comprising: a main body, an inner needle assembly, a rotating handle, a sealing cap, and a fixing seat; the main body is a hollow cylindrical structure, with a beveled opening at the distal end and a connection port at the proximal end; the inner needle assembly includes a needle tip and a needle handle, the needle tip and the needle handle being fixedly connected, the needle tip being slidably disposed in the inner cavity of the main body, the tip of the needle tip extending to the beveled opening of the main body and abutting against the edge of the beveled opening; a rotating handle is fixedly connected to the proximal connection port of the main body, the rotating handle being annular; the sealing cap is installed at the proximal connection port of the main body via a threaded connection, the sealing cap having a through hole in its center, the needle handle passing through the through hole in the center of the sealing cap and connecting to the fixing seat; the fixing seat is disposed outside the sealing cap, the fixing seat having a rotating groove inside, the end of the needle handle being inserted into the rotating groove and able to rotate within the rotating groove.
[0007] The technical advantages of the puncture sampling catheter provided by this utility model are as follows: Through the coordinated cooperation of the main tube, inner needle assembly, rotating handle, sealing cap, and fixing seat, a puncture sampling catheter with a reasonable structure is formed. The inclined opening design of the main tube facilitates tissue cutting, the inner needle assembly can slide and rotate within the main tube, and the sealing cap and fixing seat cooperate to form a sealing structure, while ensuring that the needle handle can rotate within the rotating groove of the fixing seat. This improves the accuracy and flexibility of puncture sampling, reduces tissue damage, and improves sampling quality and safety.
[0008] Based on the above technical solution, the puncture sampling catheter of this utility model can be further improved as follows:
[0009] The main body is made of medical-grade stainless steel, and the outer wall of the main body is provided with scale lines, which are spaced apart along the length of the main body; the inner wall surface of the main body is polished.
[0010] The inner wall roughness Ra value of the main tube is no greater than 0.4 μm, the outer diameter of the main tube is 2 to 8 mm, the wall thickness is 0.2 to 0.8 mm, and the length of the main tube is 80 to 200 mm. The main tube is made of medical-grade stainless steel, which has good biocompatibility and mechanical strength. The graduation lines on the outer wall of the main tube facilitate medical personnel in controlling the puncture depth. The inner wall is polished to reduce tissue friction resistance and lower the risk of tissue damage. The reasonable design of the outer diameter, wall thickness, and length ensures the strength and flexibility of the catheter, making it suitable for puncture and sampling needs at different sites.
[0011] Furthermore, the beveled opening is elliptical, the bevel angle of the beveled opening is 20 to 45°, the edge of the beveled opening is provided with a reinforcing ring, and the reinforcing ring is integrally formed with the distal end of the main body; the edge of the beveled opening is chamfered to reduce tissue damage; a lateral sampling hole is provided in the long axis direction of the beveled opening.
[0012] The chamfer radius of the beveled opening is 0.1 to 0.3 mm; the diameter of the lateral sampling port is 1 to 3 mm. The beveled opening has a reasonable bevel angle design, which facilitates tissue cutting for sampling; the reinforcing ring structure enhances the strength of the opening edge and prevents deformation; the chamfered edge treatment reduces secondary damage to the tissue; the lateral sampling port increases the sampling pathways, improves the diversity and adaptability of sampling, and enables doctors to choose the best sampling method according to the characteristics of different lesions.
[0013] Furthermore, the needle tip of the inner needle assembly is a solid structure, and the outer diameter of the needle tip is 0.1 to 0.5 mm smaller than the inner diameter of the main tube, forming an annular gap; the front end of the needle tip is a triangular tip with an angle of 15 to 30°; the outer diameter of the needle handle is larger than the outer diameter of the needle tip, and the needle handle and the needle tip are connected by a stepped transition section.
[0014] The stepped transition section has a length of 5 to 15 mm. The needle tip of the inner needle assembly has a solid structure, which improves puncture strength and orientation accuracy; the triangular tip design reduces puncture resistance and facilitates tissue penetration; the annular gap formed by the needle tip's outer diameter being smaller than the tube's inner diameter is beneficial for the collection and preservation of sampled tissue; the stepped transition section connection design improves the connection strength between the needle tip and the needle handle, preventing breakage.
[0015] Furthermore, the inner ring of the rotating handle is provided with multiple annularly distributed inner protrusions, and the outer ring of the rotating handle is provided with anti-slip ridges. The rotating handle is an annular structure, and the inner diameter of the rotating handle matches the outer diameter of the main body. The rotating handle is fixed to the near end of the main body by interference fit. The outer ring surface of the rotating handle is provided with anti-slip ridges, which are distributed in a wavy pattern.
[0016] The rotating handle has a thickness of 5 to 10 mm, an outer diameter of 20 to 35 mm, and a wavy anti-slip texture with a height of 0.5 to 1 mm. The ring-shaped structure of the rotating handle conforms to ergonomic principles, facilitating operation by medical personnel. It is fixed to the main body via an interference fit, ensuring a stable connection. The wavy anti-slip texture on the outer ring surface of the rotating handle increases friction, preventing finger slippage during puncture and improving operational accuracy and safety.
[0017] Furthermore, the sealing cap has a cylindrical structure, and the inner side of the sealing cap is provided with an internal thread that matches the external thread on the outer side of the proximal end of the main body; the outer edge of the sealing cap is provided with multiple annularly distributed protrusions to increase finger grip strength; an annular sealing ring is provided in the through hole in the center of the sealing cap, and the annular sealing ring abuts tightly against the outer wall of the needle handle to form a sealing structure.
[0018] The sealing cap has an outer diameter of 15 to 25 mm and a height of 8 to 15 mm. The sealing cap is installed near the main tube via a threaded connection, forming a detachable structure for easy cleaning and maintenance. The protrusions on the outer edge of the sealing cap increase finger grip and facilitate rotational operation. The annular sealing ring inside the central through hole forms a sealing structure with the needle handle to prevent leakage of bodily fluids and air ingress, ensuring the sterility and safety of the puncture sampling process.
[0019] Furthermore, the annular sealing ring is made of silicone rubber, forming an interference fit; the cross-section of the annular sealing ring is an O-shaped structure.
[0020] The inner diameter of the annular sealing ring is 0.1 to 0.3 mm smaller than the outer diameter of the needle shank, the thickness of the annular sealing ring is 1 to 2 mm, and the diameter of the O-ring structure is 1.5 to 2.5 mm. The annular sealing ring is made of silicone rubber, which has good elasticity and sealing performance; the interference fit design ensures a tight seal and prevents leakage of bodily fluids; the O-ring cross-section structure increases the sealing contact area, improves sealing reliability, and allows the needle shank to slide and rotate freely within the sealing ring without affecting operational flexibility.
[0021] Furthermore, the needle tip is coated with a lubricating coating; the needle tip is made of medical-grade elastic stainless steel, and its length is 5 to 15 mm shorter than the main body.
[0022] The thickness of the lubricating coating is 0.01 to 0.05 mm, and the strength of the needle is greater than 800 MPa. The lubricating coating on the needle surface reduces the frictional resistance with tissue and lowers the risk of tissue damage. The medical-grade elastic stainless steel material has good biocompatibility and appropriate elasticity to prevent the needle from breaking during puncture. The design of the needle length being shorter than the tube body ensures that the needle tip does not protrude excessively, reducing the risk of puncture too deeply.
[0023] Furthermore, the inner ring of the rotary handle is provided with eight evenly distributed annular inner protrusions, which are interference-fitted with the outer wall of the main body to enhance the connection stability between the rotary handle and the main body.
[0024] The height of the inner protrusion is 1 to 2 mm, and the width is 2 to 4 mm. The eight evenly distributed inner protrusions on the inner ring of the rotating handle are connected to the main tube body by interference fit, which enhances the connection stability. The reasonable height and width design of the inner protrusions ensures sufficient connection strength, prevents the rotating handle from loosening or falling off during use, and improves the overall stability and operational safety of the puncture catheter.
[0025] Furthermore, the fixing base has a disc-shaped structure; the center of the fixing base is provided with a rotating groove, and the end of the needle handle can rotate freely in the rotating groove; the side wall of the fixing base is provided with annular fingerprint anti-slip texture.
[0026] The fixing base has a diameter of 20 to 30 mm and a thickness of 5 to 10 mm. The depth of the rotating groove is 5 to 15 mm, and the inner diameter of the rotating groove is 0.1 to 0.3 mm larger than the outer diameter of the needle handle end. The depth of the annular fingerprint anti-slip texture is 0.3 to 0.8 mm. The disc-shaped structure of the fixing base provides a stable grip platform; the central rotating groove mates with the end of the needle handle, allowing the needle handle to rotate freely within the rotating groove, facilitating the doctor's adjustment of the needle direction; the annular fingerprint anti-slip texture on the side wall increases friction and improves grip stability, enabling the doctor to accurately control the puncture direction and depth during puncture sampling.
[0027] Compared with the prior art, the beneficial effects of the puncture sampling catheter provided by this utility model are: the puncture sampling catheter provided by this utility model, through the coordinated operation of the main body, inner needle assembly, rotating handle, sealing cap and fixing seat, successfully constructs a puncture sampling device with a scientific and reasonable structure and flexible and convenient operation.
[0028] The beveled opening design of the main tube increases the sampling area while cleverly reducing the resistance encountered when cutting tissue. Meanwhile, the clearly marked graduations on the main tube provide strong support for doctors to accurately control the puncture depth during the puncture process, effectively reducing the risk of complications caused by excessively deep punctures.
[0029] The inner needle assembly can slide freely within the tube and can be easily rotated and adjusted with the aid of the retainer. Its unique triangular tip design significantly reduces tissue resistance during puncture, greatly minimizing damage to the patient's tissues.
[0030] The rotating handle is meticulously designed according to ergonomic principles, conforming to the human hand's operating habits, greatly improving the stability and comfort of doctors during operation, and reducing sampling deviations caused by operational errors;
[0031] The sealing cap and annular sealing ring fit tightly together, forming a reliable dynamic seal through an interference fit based on the principle of fluid sealing. This design not only effectively prevents bodily fluid leakage but also ensures a good seal is maintained throughout the free sliding and rotation of the needle handle, guaranteeing the sterility of the sampling environment. Attached Figure Description
[0032] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0033] Figure 1 A perspective view of a puncture sampling catheter;
[0034] Figure 2 A bottom view of a puncture sampling catheter;
[0035] The attached diagram lists the components represented by each number as follows:
[0036] 10. Main body; 20. Inner needle assembly; 21. Needle tip; 22. Needle handle; 30. Rotating handle; 40. Sealing cap; 50. Fixing base. Detailed Implementation
[0037] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.
[0038] like Figures 1-2The diagram shows a first embodiment of a puncture sampling catheter provided by this utility model. In this embodiment, it includes: a main tube 10, an inner needle assembly 20, a rotating handle 30, a sealing cap 40, and a fixing base 50. The main tube 10 has a hollow cylindrical structure, with a beveled opening at its distal end and a connection port at its proximal end. The inner needle assembly 20 includes a needle tip 21 and a needle handle 22, with the needle tip 21 fixedly connected to the needle handle 22. The needle tip 21 is slidably disposed within the inner cavity of the main tube 10, and the tip of the needle tip 21 extends to the main tube. The inclined opening of the tube body 10 abuts against the edge of the inclined opening; a rotating handle 30 is fixedly connected to the proximal end connection port of the main tube body 10, and the rotating handle 30 is in the shape of a ring; the sealing cover 40 is installed at the proximal end connection port of the main tube body 10 by threaded connection, and a through hole is opened in the center of the sealing cover 40. The needle handle 22 passes through the through hole in the center of the sealing cover 40 and is connected to the fixing seat 50; the fixing seat 50 is located on the outside of the sealing cover 40, and a rotating groove is provided in the fixing seat 50. The end of the needle handle 22 is inserted into the rotating groove and can rotate in the rotating groove.
[0039] In the above technical solution, the main body 10 is made of medical-grade stainless steel, and the outer wall of the main body 10 is provided with scale lines, which are spaced apart along the length of the main body 10; the inner wall surface of the main body 10 is polished.
[0040] Furthermore, in the above technical solution, the inclined opening is elliptical, the bevel angle of the inclined opening is 20 to 45°, the edge of the inclined opening is provided with a reinforcing ring, and the reinforcing ring is integrally formed with the distal end of the main body 10; the edge of the inclined opening is chamfered to reduce tissue damage; a lateral sampling hole is provided in the long axis direction of the inclined opening.
[0041] Furthermore, in the above technical solution, the needle 21 of the inner needle assembly 20 is a solid structure, and the outer diameter of the needle 21 is 0.1 to 0.5 mm smaller than the inner diameter of the main body 10, forming an annular gap; the front end of the needle 21 is a triangular tip with an angle of 15 to 30°; the outer diameter of the needle handle 22 is larger than the outer diameter of the needle 21, and the needle handle 22 and the needle 21 are connected by a stepped transition section.
[0042] Furthermore, in the above technical solution, the inner ring of the rotating handle 30 is provided with a plurality of annularly distributed inner protrusions, the outer ring of the rotating handle 30 is provided with anti-slip textures, the rotating handle 30 is an annular structure, the inner diameter of the rotating handle 30 matches the outer diameter of the main body 10, and the rotating handle 30 is fixed to the near end of the main body 10 by interference fit; the outer ring surface of the rotating handle 30 is provided with anti-slip textures, and the anti-slip textures are distributed in a wave-like pattern.
[0043] Furthermore, in the above technical solution, the sealing cap 40 has a cylindrical structure, and the inner side of the sealing cap 40 is provided with an internal thread, which matches the external thread on the outer side of the proximal end of the main body 10; the outer edge of the sealing cap 40 is provided with multiple annularly distributed protrusions to increase finger gripping force; the through hole in the center of the sealing cap 40 is provided with an annular sealing ring, which abuts tightly against the outer wall of the needle handle 22 to form a sealing structure.
[0044] Furthermore, in the above technical solution, the annular sealing ring is made of silicone rubber, forming an interference fit; the cross-section of the annular sealing ring is an O-shaped structure.
[0045] Furthermore, in the above technical solution, the surface of the needle 21 is coated with a lubricating coating; the material of the needle 21 is medical-grade elastic stainless steel, and the length of the needle 21 is 5 to 15 mm shorter than that of the main body 10.
[0046] Furthermore, in the above technical solution, the inner ring of the rotary handle 30 is provided with 8 annularly distributed inner protrusions, which are interference-fitted with the outer wall of the main body 10 to enhance the connection stability between the rotary handle 30 and the main body 10.
[0047] Furthermore, in the above technical solution, the fixing seat 50 has a disc-shaped structure; the center of the fixing seat 50 is provided with a rotating groove, and the end of the needle handle 22 can rotate freely in the rotating groove; the side wall of the fixing seat 50 is provided with annular fingerprint anti-slip texture.
[0048] Specifically, the principle of this utility model is as follows: The design concept of this utility model closely revolves around the principles of fluid mechanics and materials mechanics. By comprehensively optimizing the catheter structure, the accuracy and safety of puncture sampling are greatly improved.
[0049] The main body employs a beveled opening design, a design rooted in profound cutting mechanics principles. Extensive experimentation and research have verified that setting the beveled opening angle between 20 and 45° yields the optimal tissue cutting effect. At this angle, not only can the sampling area be effectively increased to ensure sufficient tissue sample acquisition, but the resistance generated during cutting is also significantly reduced, minimizing damage to surrounding tissues.
[0050] The triangular tip design of the inner needle assembly is also based on the theory of tip mechanics. The triangular tip structure can concentrate the tissue resistance encountered during puncture at three sharp ends, thereby effectively reducing puncture resistance, reducing the risk of tissue damage, and making the puncture process smoother;
[0051] The design of the sealing cap and annular sealing ring strictly adheres to the principles of fluid sealing. Through careful design of the interference fit parameters between the two, a reliable dynamic seal is achieved without hindering the free sliding and rotation of the needle handle. This design effectively prevents bodily fluid leakage, maintains a sterile environment during sampling, and provides strong assurance for obtaining high-quality samples.
[0052] The rotating groove design of the fixation base draws inspiration from the principle of rotary bearings. By incorporating a precise rotating groove structure within the fixation base, the needle handle can rotate stably within it. This allows doctors to easily and accurately adjust the needle angle according to actual needs, greatly improving the flexibility and precision of puncture procedures.
Claims
1. A puncture sampling catheter, characterized by, include: The system comprises a main body, an inner needle assembly, a rotating handle, a sealing cap, and a fixing base. The main body is a hollow cylindrical structure with a beveled opening at its distal end and a connection port at its proximal end. The inner needle assembly includes a needle tip and a needle shank, which are fixedly connected. The needle tip is slidably disposed within the inner cavity of the main body, with its tip extending to the beveled opening and abutting against the edge of the opening. A rotating handle, in the shape of a ring, is fixedly connected to the connection port at the proximal end of the main body. The sealing cap is threadedly installed at the connection port at the proximal end of the main body, with a through hole at its center. The needle shank passes through this through hole and connects to the fixing base. The fixing base is located outside the sealing cap and has a rotating groove inside. The end of the needle shank is inserted into the rotating groove and can rotate within it.
2. A puncture sampling catheter according to claim 1, wherein, The main body is made of medical-grade stainless steel. The outer wall of the main body is provided with scale lines, which are spaced apart along the length of the main body. The inner wall surface of the main body is polished.
3. A puncture sampling catheter according to claim 2, wherein, The beveled opening is elliptical, with a bevel angle of 20 to 45°. A reinforcing ring is provided at the edge of the beveled opening, and the reinforcing ring is integrally formed with the distal end of the main tube. The edge of the beveled opening is chamfered to reduce tissue damage. A lateral sampling hole is provided along the long axis of the beveled opening.
4. A puncture sampling catheter according to claim 3, wherein, The needle of the inner needle assembly is a solid structure, and the outer diameter of the needle is 0.1 to 0.5 mm smaller than the inner diameter of the main tube, forming an annular gap; the front end of the needle is a triangular tip with an angle of 15 to 30°; the outer diameter of the needle handle is larger than the outer diameter of the needle, and the needle handle and the needle are connected by a stepped transition section.
5. A puncture sampling catheter according to claim 4, wherein, The inner ring of the rotating handle has multiple evenly distributed annular protrusions, and the outer ring of the rotating handle has anti-slip ridges. The rotating handle is a ring structure, and the inner diameter of the rotating handle matches the outer diameter of the main body. The rotating handle is fixed to the near end of the main body by interference fit. The outer ring surface of the rotating handle has anti-slip ridges, which are distributed in a wavy pattern.
6. A puncture sampling catheter according to claim 5, wherein, The sealing cap has a cylindrical structure with an internal thread on its inner side, which matches the external thread on the outer side of the main body near the end. The outer edge of the sealing cap has multiple evenly distributed annular protrusions to increase finger grip strength. The through hole in the center of the sealing cap has an annular sealing ring that abuts tightly against the outer wall of the needle handle to form a sealing structure.
7. A puncture sampling catheter according to claim 6, characterized in that, The annular sealing ring is made of silicone rubber and forms an interference fit; the cross-section of the annular sealing ring is an O-shaped structure.
8. A puncture sampling catheter according to claim 7, characterized in that, The needle tip is coated with a lubricating coating; the needle tip is made of medical-grade elastic stainless steel, and its length is 5 to 15 mm shorter than the main body.
9. A puncture sampling catheter according to claim 8, characterized in that, The inner ring of the rotary handle has eight evenly distributed annular protrusions. The protrusions are interference-fitted with the outer wall of the main body to enhance the connection stability between the rotary handle and the main body.
10. A puncture sampling catheter according to claim 9, characterized in that, The fixing base has a disc-shaped structure; the center of the fixing base has a rotating groove, and the end of the needle handle can rotate freely in the rotating groove; the side wall of the fixing base has annular fingerprint anti-slip texture.