Tightening-adjustable catheter fixing device

Abstract

According to the screwing-adjustable catheter fixing device, a fixing base is a topless shell with a hollow inner cavity, and a rotating core is rotationally connected into the topless shell; the rotating core comprises a rotating shaft capable of rotating relative to the fixed seat, the upper part of the rotating shaft is connected with a holding part synchronously rotating with the rotating shaft, and the lower part of the rotating shaft is provided with a winding section for winding the rope body; the rope body comprises at least one positioning section fixed to the winding section, and the part, penetrating out of the outer wire hole and exposed to the outside, of the rope body serves as an adjusting section used for fixing the catheter. The holding part drives the rotating shaft to rotate synchronously, so that the length of the adjusting section is adjusted, and the adjusting section clings to the peripheral surfaces of catheters with different calibers. The fixing strength is freely adjusted by rotating the holding part, the fixing requirements of catheters with different diameters and hardness are met, the dual effects of fixing the catheter and adjusting the peripheral pressure of the catheter are achieved through the adjusting section, interference of the catheter fixing device on liquid in the catheter is effectively reduced, and the stability of infusion / drainage operation is guaranteed.

Description

Technical Field

[0001] The invention relates to the field of medical device technology, and in particular to a screw-tight and adjustable catheter fixing device. Background Art

[0002] The catheter holder is a medical device product, mainly used to fix various catheters to prevent errors or displacement during use. It is widely used to fix puncture needle protection, indwelling needle fixation, intravenous cannulation, medical drainage catheters, etc.

[0003] Catheter fixers usually use structures such as snaps or adjustable Velcro to fix the catheter, and are combined with mounting structures such as substrates with adhesive layers or adhesive sheets to fix the fixture on the mounting surface. The existing catheter fixers have limited adjustment gears, mostly 3-5 gears. For different patients and catheter specifications for different parts, multiple catheter fixers of corresponding specifications need to be equipped, which increases the burden of equipment management. At the same time, the fixing force of the existing catheter fixers is not adjustable, and the pressure on the outer periphery of the catheter cannot be adjusted in a targeted manner. For tubes with different hardness or special cross-sections, such as hoses or multi-lumen catheters, the pressure on the force-bearing surface is uneven, and excessive extrusion is prone to cause deformation of the catheter, thereby affecting the infusion or drainage effect, and it cannot meet the needs of fine-tuning. Summary of the invention

[0004] The purpose of the present invention is to solve the existing technical problems and to propose a catheter fixing device which can realize catheter fixing and peripheral pressure regulation.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a tightening adjustable catheter fixing device, comprising a rope body, a rotating core and a fixing seat for fixing on a mounting surface,

[0006] The fixed seat is a topless shell with a hollow inner cavity, the side wall of the topless shell is provided with an external line hole connecting the outside and the hollow inner cavity, and a rotating core is rotatably connected inside the topless shell;

[0007] The rotating core comprises a rotating shaft which can rotate relative to the fixed seat, the upper part of the rotating shaft is connected to a gripping part which rotates synchronously with the rotating shaft, and the lower part of the rotating shaft is provided with a winding section for winding the rope body;

[0008] The rope body includes at least one positioning section fixed on the winding section, the rope body passes through the outer wire hole to the outside, and the portion of the rope body passing through the outer wire hole and exposed to the outside serves as an adjustment section for fixing the catheter;

[0009] The holding portion drives the rotating shaft to rotate synchronously, so as to adjust the length of the adjusting section so that the adjusting section can be closely attached to the peripheral surface of catheters with different calibers.

[0010] Specifically, the bottom of the fixing seat extends horizontally to form a base plate, the lower surface of the base plate is connected with an adhesive layer, the lower surface of the adhesive layer is covered with release paper, and the catheter fixing device is fixed to the installation surface through the adhesive layer, and the installation surface is the human epidermis or the surface of the instrument.

[0011] Preferably, there are two positioning sections, both ends of the rope body are fixed on the winding section, and the adjustment section is a first adjustment sleeve with an adjustable inner diameter.

[0012] Preferably, there is one positioning section, one end of the rope body is fixed on the winding section, and the other end passes through the outer wire hole, surrounds the outer circumference of the catheter and is fastened to the adjustment section through a snap buckle. The adjustment section is an adjustment rope with adjustable length.

[0013] Specifically, a limiting block which slides freely along the adjusting section is provided on the adjusting section, and the outer diameter of the limiting block is larger than the inner diameter of the outer wire hole.

[0014] Preferably, the hollow inner cavity is provided with a reducing section whose inner diameter gradually decreases from top to bottom, and a positioning slope is formed on the inner wall of the fixed seat of the reducing section, and a plurality of anti-return blocks are circumferentially arranged on the positioning slope; a flexible arm is connected to the rotating shaft and is in unidirectional contact with the anti-return block, and the distance between the lower part of the outer wall of the flexible arm and the rotating shaft is smaller than the distance between the upper part of the outer wall of the flexible arm and the rotating shaft, so that when the flexible arm is in contact with the anti-return block, the orthographic projection of the flexible arm overlaps with the orthographic projection of the positioning slope, and a first vertical gap is left between the flexible arm and the positioning slope; when the flexible arm moves downward, the flexible arm is squeezed and fitted with the positioning slope.

[0015] Preferably, the hollow inner cavity is provided with a reducing section whose inner diameter gradually decreases from top to bottom, and a positioning slope is formed on the inner wall of the fixed seat; the bottom of the non-return block is connected to the positioning slope, and the lower part of the outer wall of the flexible arm is provided with a rounded corner, so that when the flexible arm abuts the non-return block, the orthographic projection of the flexible arm overlaps with the orthographic projection of the positioning slope, and a first vertical gap is left between the flexible arm and the positioning slope; when the flexible arm moves downward, the flexible arm is squeezed and fitted with the positioning slope.

[0016] Preferably, the flexible arm is located between the gripping portion and the winding section, one end of the flexible arm is connected to the rotating shaft, and the other end is provided with an abutment portion that abuts unidirectionally with the non-return block, so that the length of the adjustment section can be shortened by the unidirectional rotation of the rotating core.

[0017] Preferably, the hollow inner cavity is also equipped with an elastic member, one end of which is fixed to the bottom of the rotating core, and the other end is fixed to the bottom wall of the hollow inner cavity; when the elastic member is in a natural state, the flexible arm abuts against the anti-return block in one direction, and a second vertical gap is left between the lower end surface of the rotating core and the bottom wall of the hollow inner cavity.

[0018] Preferably, a limiting part protrudes outward at the bottom of the holding part, and a limiting step for clamping the limiting part is arranged on the inner side wall of the fixing seat, so that the limiting part abuts against the limiting step upward; the anti-reverse stop block is located below the limiting step, and the upper end surface of the anti-reverse stop block abuts against the limiting part downward.

[0019] Specifically, the top of the holding part is a T-shaped, flat-shaped or cylindrical handle.

[0020] Preferably, the rotating core further includes a mounting cover; the elastic member is a spring coaxially arranged with the rotating shaft, the mounting cover is fixed to the bottom of the rotating shaft, the mounting cover is sleeved outside the spring, and the outer diameter of the mounting cover is larger than the outer diameter of the rotating shaft.

[0021] The beneficial effects of the present invention are as follows: By rotating the holding part, the fixing force can be freely adjusted to meet the fixing requirements of catheters with different diameters and hardnesses, and it can be applied to catheters with specifications of F6 (2mm)-F36 (12mm);

[0022] The adjustment operation is simple and convenient. Rotating the holding part in one direction can shorten the adjustment section to achieve an efficient catheter fixing effect. On the contrary, pressing the handle downward and rotating it in the reverse direction can pull the rope body outward to make the adjustment section extend, so as to disassemble the catheter;

[0023] The double effects of fixing the catheter and adjusting the peripheral pressure of the catheter are achieved through the adjustment section, effectively reducing the interference of the catheter fixing device on the liquid in the catheter and ensuring the stability of the infusion / drainage operation. Description of the Drawings

[0024] Figure 1 It is a usage state diagram of a screw-tightening adjustable catheter fixing device of the present invention;

[0025] Figure 2 It is an assembly schematic diagram of a screw-tightening adjustable catheter fixing device of the present invention and an adhesive layer;

[0026] Figure 3 It is an exploded view of a screw-tightening adjustable catheter fixing device of the present invention;

[0027] Figure 4 It is a structural schematic diagram of the rotating core of the present invention;

[0028] Figure 5 It is a structural schematic diagram of the fixing seat of the present invention;

[0029] Figure 6 It is a horizontal sectional view schematic diagram of the present invention;

[0030] Figure 7 It is a vertical sectional view schematic of the present invention Figure 1 ;

[0031] Figure 8 It is a vertical sectional view schematic of the present invention Figure 2 ;

[0032] Figure 9 For Figure 8 The enlarged view at position A in Specific embodiments

[0033] Next, in combination with the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0034] A rotatable and adjustable catheter fixing device of the present invention, as Figures 1-5 shown, includes a rope body 3, a rotating core 2, and a fixing base 1 for fixing on the mounting surface. The fixing base 1 is a roofless shell with a hollow inner cavity. An outer wire hole 14 communicating with the outside and the hollow inner cavity is opened on the side wall of the roofless shell. A rotating core 2 is rotatably connected inside the roofless shell;

[0035] The rotating core 2 includes a rotating shaft that can rotate relative to the fixing base 1. A holding portion 20 that rotates synchronously with the rotating shaft is connected to the upper part of the rotating shaft. A winding section 21 for winding the rope body 3 is provided at the lower part of the rotating shaft;

[0036] The rope body 3 includes at least one positioning section fixed on the winding section 21. The rope body 3 passes through the outer wire hole 14 and exits to the outside. The part of the rope body 3 exposed to the outside after passing through the outer wire hole 14 is used as an adjustment section 30 for fixing the catheter 6;

[0037] By driving the rotating shaft to rotate synchronously through the holding portion 20, the length of the adjustment section 30 is adjusted so that it closely adheres to the circumferential surface of catheters 6 with different diameters.

[0038] Specifically, a substrate 10 extends horizontally at the bottom of the fixing base 1. An adhesive layer 5 is connected to the lower surface of the substrate 10. A release paper is covered on the lower surface of the adhesive layer 5. The catheter fixing device is fixed on the mounting surface through the adhesive layer. The mounting surface is the human epidermis or the surface of the instrument.

[0039] Such as Figure 5 And 8 shown, the fixing base 1 on the substrate 10 can be one, two, or more. The fixing base 1 is located at the center, both ends, or equidistantly arranged on the substrate 10. By arranging the fixing bases in a row, the anti-displacement effect is strengthened.

[0040] Specifically, the shape of the adhesive layer 5 can be strip-shaped, butterfly-shaped, elliptical, rectangular, etc., and the corners of the adhesive layer are all rounded. The shape of the substrate is a circular plate or a strip-shaped plate with rounded corners.

[0041] Furthermore, the rope body 3 is a steel wire rope or a cord with low stretchability to achieve a stable anti-displacement effect and avoid the pulling interference of the catheter 6 on the wound. The radial cross-section of the rope body 3 can be circular or flat.

[0042] A screwing and adjustable catheter fixing device, as Figures 6-9 shown, a variable diameter section with a gradually decreasing inner diameter from top to bottom is provided in the hollow inner cavity. A positioning slope 11 is formed on the inner side wall of the fixing seat 1 in the variable diameter section, and a number of anti-backflow stoppers 12 are circumferentially arranged on the positioning slope 11; a flexible arm 22 that is in one-way contact with the anti-backflow stopper 12 is connected to the rotating shaft. The distance between the lower part of the outer side wall 2201 of the flexible arm and the rotating shaft is less than the distance between the upper part of the outer side wall 2201 of the flexible arm and the rotating shaft. When the flexible arm 22 is in contact with the anti-backflow stopper 12, the orthographic projection of the flexible arm 22 overlaps with a part of the orthographic projection of the positioning slope 11, and a first vertical gap 71 is left between the flexible arm 22 and the positioning slope 11; when the flexible arm 22 moves downward, the flexible arm 22 and the positioning slope 11 are in extrusion fit. The positioning slope is used to increase the horizontal support of the fixing seat on the flexible arm to resist the vertical acting force of the catheter on the rotating shaft and assist the anti-displacement function of the catheter in the fixed state.

[0043] Further, the slope of the positioning slope 11 is not less than 10°.

[0044] Further, the anti-backflow stoppers 12 are arranged on the inner side wall of the fixing seat 1 at equal arc distances, and the arc distance between adjacent anti-backflow stoppers 12 can be customized and adjusted according to the fine-tuning requirements. The number of anti-backflow stoppers is at least 8.

[0045] Further, the corner between the outer side wall 2201 of the flexible arm and the bottom surface is a rounded corner or a chamfer to guide the downward movement of the flexible arm and the extrusion fit with the positioning slope.

[0046] Further, the flexible arm 22 is located between the holding part 20 and the winding section 21. One end of the flexible arm 22 is connected to the rotating shaft, and the other end is provided with a contact part 220 that is in one-way contact with the anti-backflow stopper 12. The shortening of the length of the adjustment section is realized by the one-way rotation of the rotating core.

[0047] Further, the number of flexible arms 22 can be one, two or more, and the adjacent flexible arms 22 are arranged at equal arc distances; a radial gap is left between the rotating shaft and the anti-backflow stopper 12.

[0048] Further, a reinforcing part protrudes from the rotating shaft, the outer diameter of the reinforcing part is larger than the outer diameter of the rotating shaft, and the flexible arm 22 is connected to the outer circumference of the reinforcing part.

[0049] A screwing and adjustable catheter fixing device, the rotating core 2 is injection-molded with a lightweight material, and the surface of the rotating core is a rough surface to increase the friction with the fixing seat.

[0050] A screwing and adjustable catheter fixing device, as Figure 2 、 7As shown in Fig. 8, an elastic member 4 is also installed in the hollow inner cavity. One end of the elastic member 4 is fixed to the bottom of the rotating core 2, and the other end is fixed to the bottom wall of the hollow inner cavity. When the elastic member 4 is in its natural state, the flexible arm 22 is in one-way abutment with the anti-reverse stopper 12, and there is a second vertical gap 72 between the lower end face of the rotating core 2 and the bottom wall of the hollow inner cavity. By pressing down the holding part 20 to drive the rotating core downward, the elastic member 4 is compressed and shortened, causing the flexible arm 22 to move downward until the flexible arm 22 completely disengages from the horizontal plane where the anti-reverse stopper 12 is located through the extrusion fit of the positioning slope 11. At this time, the one-way rotation restriction of the rotating shaft is released, and the rope body 3 wound around the winding segment 21 can be released by the reverse rotation of the holding part 20 through synchronous transmission of the rotating shaft.

[0051] Further, the elastic member 4 is a spring coaxially arranged with the rotating core 2. The height of the second vertical gap 72 is greater than the height of the anti-reverse stopper 12. An installation cover 23 is connected to the bottom of the rotating core 2. The installation cover 23 is sleeved outside the spring, and the outer diameter of the installation cover 23 is greater than the outer diameter of the rotating shaft.

[0052] A tightening adjustable catheter fixing device, a limiting part 201 protrudes outward from the bottom of the holding part 20, and a limiting step 13 for clamping the limiting part 201 is provided on the inner side wall of the fixed seat 1, so that the limiting part 201 abuts against the limiting step 13 upward; the anti-reverse stopper 12 is located below the limiting step 13, and the upper end face of the anti-reverse stopper 12 abuts against the limiting part 201 downward. During assembly, the rotating core is placed into the hollow inner cavity from the top, and the installation operation is completed through the clamping fit between the limiting part and the limiting step.

[0053] Further, the limiting step 13 is arranged around the inner side wall of the fixed seat 1, and the limiting part 201 can be a limiting ring or a limiting convex block.

[0054] Further, the top of the holding part 20 is a T-shaped, flat-shaped or cylindrical handle. A plurality of first marking areas are provided on the outer circumference or top of the handle, and a plurality of second marking areas are provided on the top of the fixed seat. When the first marking area and the second marking area are opposite to each other, the orthographic projection of the flexible arm completely falls between the orthographic projections of adjacent anti-reverse stoppers, which is convenient for the reset and installation operation after the rotating core is pressed.

[0055] A tightening adjustable catheter fixing device, as Figure 4 and 9 shown, the rotating core 2 is integrally formed of a flexible material, and a positioning column 24 is also connected between the flexible arm 22 and the holding part 20. The positioning column 24 is located on the inner ring side of the anti-reverse stopper 12 to assist the flexible arm 22 to rebound and reset.

[0056] A tightening adjustable catheter fixing device, the rotating shaft and the holding part are detachably connected. An installation hole is opened at the bottom of the holding part, and the top of the rotating shaft and the holding part are connected by plugging, mortise and tenon connection or clamping fit.

[0057] A tightening and adjustable catheter fixing device, wherein an inner wire hole 210 is opened on a winding segment 21, a positioning segment passes through the inner wire hole 210 and is tied and fixed, or the positioning segment passes through the inner wire hole and forms a positioning knot 31 by itself, the outer diameter of the positioning knot 31 is larger than the aperture of the inner wire hole 210, the rope body in the inner wire hole 210 serves as a positioning segment fixed relative to the winding segment, and the inner wire hole 210 is radially penetrated through the winding segment.

[0058] A screw-tight adjustable catheter fixing device, such as Figure 7 As shown, there are two positioning sections, both ends of the rope body 3 are fixed on the winding section 21, and the adjustment section 30 is a first adjustment sleeve 301 with an adjustable inner diameter. The rope body 3 passes through the outer thread hole 14 and then passes back through the outer thread hole 14, forming a first adjustment sleeve 301 with an opening close to the outer thread hole 14 on the outside, so that when the winding section 21 rotates for an arc length of d, the retracted length of the adjustment section 30 is 2d. Through the conversion of the double retracted length of the adjustment section 30, an efficient and fast retracting and retracting adjustment process is achieved.

[0059] In the initial state, the flexible arm 22 is in a one-way abutment state. After the catheter 6 passes through the first adjustment sleeve 301 and the fixing seat 1 is confirmed to be fixed on the mounting surface, the gripping portion 20 can be rotated clockwise / counterclockwise to drive the rope body on the winding segment 21 to be rolled up through the synchronous rotation of the rotating shaft, and the inner diameter of the first adjustment sleeve 301 is quickly shortened until it is adapted to the diameter of the catheter 6, thereby achieving the effect of preventing the catheter from shifting. When fine-tuning is required, the gripping portion 20 only needs to be pressed downward to make the flexible arm 22 out of the one-way abutment state, and the gripping portion 20 can be rotated counterclockwise / clockwise. At this time, the fixing effect of the catheter 6 can be fine-tuned. The rope body 3 retreating on the rope segment 21 is pulled out from the outer line hole 14 as the catheter 6 moves, so that the length of the adjustment segment 30 is extended, and the inner diameter of the first adjustment sleeve 301 is increased. After the adjustment is completed, ensure that the first marking area and the second marking area are matched and matched, and the pressure on the gripping part 20 is released. The gripping part 20 automatically rebounds with the assistance of the elastic member 4 to achieve the horizontal height reset of the flexible arm 22. The flexible arm 22 and the non-return block 12 can be unidirectionally abutted to achieve the locking of the fine-tuning effect. When it is necessary to separate the fixing device from the catheter, the inner diameter of the first adjustment sleeve can be enlarged through the fine-tuning operation. At this time, the adjustment segment can be cut off, or the catheter can be passed through the first adjustment sleeve.

[0060] Furthermore, the maximum radius of the first adjustment sleeve 301 is R, the vertical distance from the outer wire hole 14 to the mounting surface is L, R<L, so that there is a gap between the catheter and the mounting surface to prevent the catheter from being affected by gravity and causing pressure damage to the mounting surface.

[0061] A tightening adjustable catheter fixing device, the number of the positioning section is one, one end of the rope body is fixed on the winding section, the other end is passed through the outer line hole, and is connected to the adjustment section through a snap button after being wrapped around the outer circumference of the catheter 6. The adjustment section is an adjustable length adjustment rope. In the initial state, the adjustment section is an adjustment rope. When the fixing operation is performed, the adjustment rope is wrapped around the outer circumference of the catheter and connected to itself through a snap button. The adjustment rope is deformed into a second adjustment sleeve with an adjustable inner diameter. At this time, the gripping part is rotated clockwise / counterclockwise to drive the rope body on the winding section to reel up through the rotating shaft, and then the second adjustment sleeve is gradually tightened to achieve catheter fixation. When fine-tuning is required, press down the grip so that the flexible arm is located below the non-return block and out of the one-way abutment state, and rotate the grip counterclockwise / clockwise to fine-tune the catheter fixing effect. The rope ladder retreating around the rope segment is pulled out from the outer line hole as the catheter moves or the adjustment segment is pulled, so that the length of the adjustment segment is extended. The inner diameter of the second adjustment sleeve is adjusted by pulling the second adjustment sleeve. After the adjustment is completed, rotate the grip until the first marking area and the second marking area match each other, release the pressure on the grip, and the grip automatically rebounds with the assistance of the elastic member to reset the horizontal height of the flexible arm. The flexible arm and the non-return block can be in one-way abutment. When the fixing device needs to be separated from the catheter, just unfasten the buckle.

[0062] Furthermore, a limit block is provided on the adjustment section 30 and slides freely along the adjustment section 30. The outer diameter of the limit block is larger than the inner diameter of the outer line hole 14. The limit block can also be a limit ball to prevent the grip from being over-reeled so that the adjustment section is completely retracted into the hollow inner cavity. The limit block can also be used to adjust the peripheral pressure of the catheter. The eccentric transfer of the peripheral pressure of the catheter is achieved by sliding the limit block, which is suitable for special-section hoses or multi-lumen catheters that require auxiliary shaping.

[0063] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A screwing and adjustable catheter fixing device, comprising a rope body, a rotating core, and a fixing base for fixing on an installation surface, characterized in that: The fixing base is a roofless shell with a hollow inner cavity. An outer wire hole communicating the outside with the hollow inner cavity is formed on the side wall of the roofless shell, and a rotating core is rotatably connected inside the roofless shell; The rotating core includes a rotating shaft capable of rotating relative to the fixing base. A holding part synchronously rotating with the rotating shaft is connected to the upper part of the rotating shaft, and a winding section for winding the rope body is provided at the lower part of the rotating shaft; The rope body includes at least one positioning section fixed on the winding section. The rope body passes through the outer wire hole and extends to the outside. The part of the rope body exposed to the outside after passing through the outer wire hole is used as an adjusting section for fixing the catheter; By driving the rotating shaft to rotate synchronously through the holding part, the length of the adjusting section is adjusted so that it closely adheres to the circumferential surface of catheters with different diameters.

2. The adjustable catheter fixing device with screwing according to claim 1, wherein: The number of positioning sections is two. Both the head and the tail ends of the rope body are fixed on the winding section, and the adjusting section is a first adjusting sleeve with an adjustable inner diameter.

3. The adjustable catheter fixing device with screwing according to claim 1, wherein: The number of positioning sections is one. One end of the rope body is fixed on the winding section, and the other end passes through the outer wire hole. After surrounding the outer circumference of the catheter, it is tied to the adjusting section through a quick-release buckle, and the adjusting section is an adjusting rope with an adjustable length.

4. A rotatably adjustable catheter fixing device according to any one of claims 1-3, characterized in that: A limiting block sliding freely along the adjusting section is arranged on the adjusting section, and the outer diameter of the limiting block is larger than the inner diameter of the outer wire hole.

5. The adjustable catheter fixing device with screwing according to claim 1, characterized in that: The hollow inner cavity is provided with a variable-diameter section with a gradually decreasing inner diameter from top to bottom. The variable-diameter section forms a positioning slope on the inner side wall of the fixing base, and a number of anti-reverse stop blocks are circumferentially arranged on the positioning slope; a flexible arm that abuts against the anti-reverse stop blocks unidirectionally is connected to the rotating shaft. The distance between the lower part of the outer side wall of the flexible arm and the rotating shaft is smaller than the distance between the upper part of the outer side wall of the flexible arm and the rotating shaft, so that when the flexible arm abuts against the anti-reverse stop block, the orthographic projection of the flexible arm overlaps with part of the orthographic projection of the positioning slope, and a first vertical gap is left between the flexible arm and the positioning slope; when the flexible arm moves downward, the flexible arm and the positioning slope are in extrusion fit.

6. The adjustable catheter fixing device with screwing according to claim 5, wherein: The flexible arm is located between the holding part and the winding section. One end of the flexible arm is connected to the rotating shaft, and the other end is provided with an abutting part that abuts against the anti-reverse stop block unidirectionally. The shortening of the length of the adjusting section is realized through the one-way rotation of the rotating core.

7. The adjustable catheter fixing device with a screwing function according to claim 6, characterized in that: An elastic member is further installed in the hollow inner cavity. One end of the elastic member is fixed to the bottom of the rotating core, and the other end is fixed to the bottom wall of the hollow inner cavity; when the elastic member is in a natural state, the flexible arm abuts against the anti-reverse stop block unidirectionally, and a second vertical gap is left between the lower end surface of the rotating core and the bottom wall of the hollow inner cavity.

8. A screw-tightenable and adjustable catheter fixing device according to claim 5, characterized in that: A limiting part protrudes outward from the bottom of the holding part, and a limiting step for clamping the limiting part is provided on the inner side wall of the fixing base, so that the limiting part abuts against the limiting step when moving upward; the anti-reverse stop block is located below the limiting step, and the upper end surface of the anti-reverse stop block abuts against the limiting part when moving downward.

9. The adjustable catheter fixing device with a screwing function according to claim 1, wherein: The top of the holding part is a T-shaped, flat-shaped or cylindrical handle.

10. A rotatably adjustable catheter fixing device according to claim 7, characterized in that: The rotating core further includes a mounting cover; the elastic member is a spring coaxially arranged with the rotating shaft. The mounting cover is fixed to the bottom of the rotating shaft, the mounting cover covers the outside of the spring, and the outer diameter of the mounting cover is larger than the outer diameter of the rotating shaft.

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