A hemodialysis catheter structure

Abstract

The utility model discloses a hemodialysis catheter structure. The inside of dialysis sleeve is installed with the needle core for positioning dialysis sleeve, the outside of dialysis sleeve is installed with the fixed block for cooperating with the adhesive and stably fixing dialysis sleeve, dialysis sleeve includes output pipe and input pipe, and one end of dialysis sleeve is provided with the thread groove for positioning fixed block, and the edge of fixed block is processed as arc surface, and the middle part of fixed block is installed with the bolt for limiting fixed block with thread groove. Through the setting of fixed block and arc surface, the contact area of fixed block and adhesive is increased, the middle part of adhesive is pasted on the surface of fixed block and arc surface, and the edge of adhesive is pasted on the skin of patient, so that dialysis sleeve is not easy to loosen when patient moves. When the needle core is taken out from the inside of dialysis sleeve, the sealing head can be placed on the upper end of fixed block, magnetic block one and magnetic block two are magnetically attracted, the sealing head is on fixed block, and the sealing head will not be contaminated because of being placed in other places and being knocked down.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a hemodialysis catheter structure. Background Technology

[0002] Hemodialysis is one of the renal replacement therapies for patients with acute and chronic renal failure. During hemodialysis, a special catheter is often used to guide the patient's blood into an external hemodialysis device.

[0003] For example, Chinese patent application CN202420290317.2 discloses a hemodialysis catheter structure, which specifically includes a dialysis cannula, a central shell fixed to the lower end of the dialysis cannula, and an infusion tube and a drainage tube fixedly connected to the central shell. The central shell is connected to the dialysis cannula, the infusion tube, and the drainage tube. A guide needle is inserted inside the dialysis cannula, and an adhesive patch is provided on the dialysis cannula to connect with the patient's skin for fixing the dialysis cannula. However, it still has the following technical problems:

[0004] After the dialysis cannula is inserted into the patient's body, because the dialysis cannula is tubular, the adhesive tape is difficult to adhere completely to the dialysis cannula. When the patient moves, the dialysis cannula may become loose, causing discomfort. Utility Model Content

[0005] Therefore, this utility model provides a hemodialysis catheter structure to solve the problem of easy loosening of dialysis catheters in the prior art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A hemodialysis catheter structure, including a dialysis cannula.

[0008] The dialysis cannula has a needle core installed inside for positioning the dialysis cannula, and a fixing block is installed outside the dialysis cannula to secure it with adhesive tape.

[0009] The dialysis cannula includes an output tube and an input tube, and one end of the dialysis cannula has a threaded groove for positioning the fixing block.

[0010] The edge of the fixing block is machined into an arc-shaped surface, and a bolt for limiting the fixing block by engaging with a threaded groove is installed in the middle of the fixing block.

[0011] Furthermore, the rod of the needle core is provided with a scale for positioning the insertion depth of the needle core.

[0012] Furthermore, one end of the dialysis cannula is connected to a connecting block, and the middle of the connecting block has an insertion hole for inserting a needle core. One end of the insertion hole is fitted with a sealing head for sealing the insertion hole.

[0013] Furthermore, the output tube is connected to one end of the connecting block, and the input tube is connected to the other end of the connecting block. Both the output tube and the input tube are equipped with clamps, and both ends of the output tube and the input tube are equipped with connectors.

[0014] Furthermore, an annular groove is machined in the middle of the sealing head, a connecting pipe is installed in the middle of the annular groove, and a magnetic block is installed in the middle of the connecting pipe.

[0015] Furthermore, the inner wall of the annular groove is machined with internal threads, one end of the sealing head is connected to a pipe body, the outer wall of the pipe body is machined with external threads that are threadedly connected to the internal threads, and a rotating block is installed at one end of the pipe body.

[0016] Furthermore, a limiting hole for inserting a dialysis cannula is machined in the middle of the fixing block, and a second magnetic block for magnetic attraction with the first magnetic block is installed inside the fixing block.

[0017] This utility model has the following advantages:

[0018] First, the design of the fixing block and the curved surface increases the contact area between the fixing block and the adhesive, so that the center of the adhesive is attached to the surface of the fixing block and the curved surface, and the edge of the adhesive is attached to the patient's skin, making it less likely for the dialysis cannula to loosen when the patient moves.

[0019] 2. When removing the needle core from the inside of the dialysis cannula, the plug can be placed on the top of the fixing block. Magnetic blocks one and two are attracted to each other, so that the plug is on the fixing block. The plug will not be contaminated if it is bumped or dropped on the ground because it is placed elsewhere. Attached Figure Description

[0020] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0021] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0023] Figure 2 This is a schematic diagram of the needle core of this utility model;

[0024] Figure 3 This is a schematic diagram of the structure of the dialysis cannula of this utility model;

[0025] Figure 4 This is a schematic diagram of the structure of the sealing head of this utility model;

[0026] Figure 5 This is a schematic diagram of the structure of the fixing block of this utility model;

[0027] Figure 6 This is a schematic diagram of the internal structure of the fixing block of this utility model.

[0028] In the diagram: 10-dialysis cannula, 11-threaded groove, 12-connecting block, 13-output tube, 14-input tube, 15-insertion hole, 1-clamp, 2-connector, 40-sealing head, 41-annular groove, 42-connecting tube, 43-magnetic block one, 44-internal thread, 45-tube body, 46-external thread, 47-rotating block.

[0029] 20 - Needle core, 21 - Scale marks;

[0030] 30-Fixing block, 31-Bolt, 32-Limiting hole, 33-Magnetic block two, 34-Arc-shaped surface. Detailed Implementation

[0031] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0032] The terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity of description and are not intended to limit the scope of implementation of this utility model. Any changes or adjustments to their relative relationships, without substantially altering the technical content, shall also be considered within the scope of implementation of this utility model.

[0033] Please see Figures 1-6 This utility model provides a hemodialysis catheter structure, including a dialysis cannula 10.

[0034] The dialysis cannula 10 has a needle core 20 installed inside for positioning. The needle core 20 facilitates the insertion of the dialysis cannula 10 into a predetermined position within the blood vessel. After the dialysis cannula 10 is inserted, the needle core 20 is pulled out from below. Inserting the needle core 20 involves inserting the end of the core rod into the blood vessel until the dialysis cannula 10 reaches the designated position. Insertion of the dialysis cannula 10 into the blood vessel facilitates hemodialysis treatment. The needle core 20 has a scale 21 on its rod for positioning the insertion depth, making it easy to determine the insertion depth.

[0035] The dialysis cannula 10 is externally fitted with a fixing block 30 for securing the dialysis cannula 10 with adhesive tape.

[0036] The dialysis cannula 10 includes an output tube 13 and an input tube 14. One end of the dialysis cannula 10 has a threaded groove 11 for positioning the fixing block 30. A connecting block 12 is fixedly connected to one end of the dialysis cannula 10. The middle of the connecting block 12 has an insertion hole 15 for inserting the needle core 20. A sealing head 40 is installed at one end of the insertion hole 15 for sealing the insertion hole 15. After the needle core 20 is withdrawn from the inside of the dialysis cannula 10, the sealing head 40 seals the insertion hole 15 to prevent blood from flowing out and to prevent infection caused by blood coming into contact with air.

[0037] The output tube 13 is connected to one end of the connecting block 12, and the input tube 14 is connected to the other end of the connecting block 12. Clips 1 are installed on both the output tube 13 and the input tube 14, and connectors 2 are installed at one end of each. The connectors 2 facilitate connection between the dialysis cannula 10 and the dialysis equipment, allowing blood to enter the dialysis equipment through the output tube 13. After entering the dialyzer, the drawn blood undergoes diffusion, convection, and ultrafiltration through the semi-permeable membrane to remove metabolic waste (such as urea and creatinine), excess water, and electrolytes. The dialysate flows in the opposite direction to the blood, utilizing the concentration gradient to promote toxin diffusion while replenishing necessary electrolytes (such as calcium ions) to maintain internal environmental stability. The dialyzed blood is finally transported back into the blood vessels through the input tube 14 and the dialysis cannula 10.

[0038] The sealing head 40 has an annular groove 41 machined in the middle, and a connecting pipe 42 is fixedly installed in the middle of the annular groove 41. A magnetic block 43 is fixedly installed in the middle of the connecting pipe 42. The setting of the magnetic block 43 facilitates the positioning of the sealing head 40 and prevents the sealing head 40 from accidentally falling to the ground and causing infection.

[0039] The inner wall of the annular groove 41 is machined with an internal thread 44. One end of the plugging head 40 is connected to a pipe body 45. The outer wall of the pipe body 45 is machined with an external thread 46 that is threaded to the internal thread 44. A rotating block 47 is fixedly installed at one end of the pipe body 45. After the magnetic block 43 is installed in the middle of the connecting pipe 42, it is inserted into the annular groove 41 through the pipe body 45. By rotating the rotating block 47, the external thread 46 cooperates with the internal thread 44 to drive the rotating block 47 to move towards the plugging head 40, and finally fixes the magnetic block 43 inside the plugging head 40.

[0040] The edge of the fixing block 30 is processed into an arc-shaped surface 34. The setting of the fixing block 30 and the arc-shaped surface 34 makes it easier to increase the contact area between the fixing block 30 and the adhesive, so that the middle part of the adhesive is attached to the surface of the fixing block 30 and the arc-shaped surface 34, and the edge of the adhesive is attached to the patient's skin, so that the dialysis cannula 10 is not easy to loosen when the patient moves.

[0041] A bolt 31 is installed in the middle of the fixing block 30 to limit the fixing block 30 in conjunction with the threaded groove 11. The bolt 31 can be screwed into the threaded groove 11. A limiting hole 32 for inserting the dialysis cannula 10 is machined in the middle of the fixing block 30. A magnetic block 33 is installed inside the fixing block 30 to be magnetically attracted to the magnetic block 43. When installing the fixing block 30, after the dialysis cannula 10 is inserted into the limiting hole 32, the fixing block 30 is moved towards the connecting block 12 and the bolt 31 is screwed into the threaded groove 11 to complete the positioning of the fixing block 30. When the needle core 20 is taken out from the inside of the dialysis cannula 10, the sealing head 40 can be placed on the upper end of the fixing block 30. The magnetic block 43 and the magnetic block 33 are magnetically attracted to each other, so that the sealing head 40 is on the fixing block 30 and will not be contaminated by being knocked over when placed elsewhere.

[0042] Although the present invention has been described in detail above with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A hemodialysis catheter structure, comprising a dialysis cannula (10), characterized in that: The dialysis cannula (10) is equipped with a needle core (20) for positioning the dialysis cannula (10) inside, and a fixing block (30) is installed on the outside of the dialysis cannula (10) for securing the dialysis cannula (10) with adhesive tape. The dialysis cannula (10) includes an output tube (13) and an input tube (14). One end of the dialysis cannula (10) is provided with a threaded groove (11) for positioning the fixing block (30). The edge of the fixing block (30) is machined into an arc-shaped surface (34), and a bolt (31) for limiting the fixing block (30) by cooperating with the threaded groove (11) is installed in the middle of the fixing block (30).

2. The hemodialysis catheter structure according to claim 1, characterized in that: The rod of the needle core (20) is provided with a scale (21) for positioning the insertion depth of the needle core (20).

3. The hemodialysis catheter structure according to claim 1, characterized in that: One end of the dialysis cannula (10) is connected to a connecting block (12), and the middle of the connecting block (12) is provided with an insertion hole (15) for inserting a needle core (20). One end of the insertion hole (15) is equipped with a sealing head (40) for sealing the insertion hole (15).

4. The hemodialysis catheter structure according to claim 3, characterized in that: The output tube (13) is connected to one end of the connecting block (12), and the input tube (14) is connected to the other end of the connecting block (12). Both the output tube (13) and the input tube (14) are equipped with clips (1), and both the output tube (13) and the input tube (14) are equipped with connectors (2).

5. The hemodialysis catheter structure according to claim 3, characterized in that: The sealing head (40) has an annular groove (41) machined in the middle, a connecting pipe (42) is installed in the middle of the annular groove (41), and a magnetic block (43) is installed in the middle of the connecting pipe (42).

6. The hemodialysis catheter structure according to claim 5, characterized in that: The inner wall of the annular groove (41) is machined with an internal thread (44), one end of the sealing head (40) is connected to a pipe body (45), the outer wall of the pipe body (45) is machined with an external thread (46) that is threadedly connected to the internal thread (44), and a rotating block (47) is installed at one end of the pipe body (45).

7. The hemodialysis catheter structure according to claim 5, characterized in that: The fixing block (30) has a limiting hole (32) in the middle for inserting the dialysis cannula (10), and a magnetic block (33) is installed inside the fixing block (30) for magnetic attraction with the magnetic block (43).

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