Vascular puncture cannulation assembly

Abstract

The present disclosure relates to the technical field of medical equipment, and provides a blood vessel puncture catheterization assembly, which comprises a hard outer tube, a soft inner tube, a movable plate and a blood oxygen detection sensor. The hard outer tube comprises a connected in-vivo section and an in-vitro section, and the side wall of the in-vivo section is provided with a through hole. The soft inner tube is movably arranged in the hard outer tube. The movable plate is movably arranged in the through hole. The movable plate comprises a first position and a second position. When the movable plate is in the first position, the movable plate is located in the hard outer tube and abuts against the soft inner tube, and the movable plate and the inner wall of the hard outer tube cooperatively clamp the soft inner tube. When the movable plate is in the second position, at least part of the movable plate penetrates out of the through hole. The blood oxygen detection sensor is arranged at one end of the in-vivo section away from the in-vitro section. The blood vessel puncture catheterization assembly provided by the present disclosure can reduce the occurrence of various damage types with different severity degrees caused by the blood vessel wall damage in the blood vessel puncture operation process.

Description

Technical Field

[0001] This disclosure relates to the field of medical device technology, and in particular to a vascular puncture and catheterization assembly. Background Technology

[0002] In clinical practice today, vascular puncture and catheterization are often required. Common types of vascular puncture and catheterization include central venous catheterization and arterial puncture and catheterization.

[0003] Indications for central venous catheterization include: Critical care: Severe trauma, shock, acute circulatory failure requiring rapid volume expansion, or monitoring of central venous pressure to assess volume status. Surgical needs: Cardiovascular surgery under cardiopulmonary bypass, off-pump surgery with anticipated significant hemodynamic fluctuations, and intraoperative and postoperative monitoring during major and medium-sized surgeries. Special treatments: Long-term infusion of hypertonic nutrition, irritating / corrosive drugs; placement of temporary / permanent pacemakers, floating catheters; continuous hemofiltration, hemodialysis, and plasma exchange.

[0004] Indications for arterial puncture and catheterization include: Hemodynamic monitoring: Continuous invasive monitoring of arterial blood pressure is required during major surgeries and intensive care to promptly capture blood pressure fluctuations. Frequent blood sampling: Repeated arterial blood sampling is necessary for blood gas analysis and electrolyte / lactate testing to avoid repeated puncture damage. Special procedures / treatments: Cardiovascular interventional procedures (such as coronary angiography and peripheral angiography) require establishing an arterial access; shock resuscitation requires precise guidance on fluid resuscitation and vasopressor administration; some blood purification treatments require arterial access.

[0005] Clinically, based on the above needs, sometimes arterial puncture is required, and sometimes venous puncture is required. Currently, vascular puncture and catheterization are generally based on clinical experience. Often, it is only after puncturing the blood vessel that it can be determined whether it is an artery or a vein. This often leads to multiple punctures to puncture the correct target vessel, which can easily result in the accidental puncture of an artery or vein, increasing the possibility of accidental vascular injury. At the same time, it can also reduce the risk of vascular wall damage of varying degrees and types of injury caused during the vascular puncture procedure. Summary of the Invention

[0006] In order to solve the above-mentioned technical problems, or at least partially solve the above-mentioned technical problems, the present invention provides a vascular puncture and catheterization assembly.

[0007] This application provides a vascular puncture and catheterization assembly, comprising: a rigid external tube including an internal segment and an external segment connected together, the internal segment having a through-hole on its side wall; a flexible internal tube movably inserted into the rigid external tube; a movable plate movably disposed at the through-hole, the movable plate having a first position and a second position; when the movable plate is in the first position, the movable plate is located inside the rigid external tube and abuts against the flexible internal tube, the movable plate and the inner wall of the rigid external tube clamping the flexible internal tube; when the movable plate is in the second position, at least a portion of the movable plate protrudes from the through-hole; and a blood oxygen detection sensor disposed at one end of the internal segment opposite to the external segment.

[0008] According to the vascular puncture and catheterization assembly provided in this application embodiment, medical personnel first align the vascular puncture and catheterization assembly with the patient's target area. At this time, the movable plate is in the first position, and the soft inner tube and the rigid outer tube are fixed in position through the movable plate and the inner wall of the rigid outer tube. Medical personnel then puncture the rigid outer tube and the soft inner tube toward the target position. When the target position is reached, the blood oxygen detection sensor can detect the blood vessel to determine whether it is an artery or a vein, ensuring accurate vascular puncture in clinical practice and avoiding accidental puncture that could increase the possibility of accidental damage to the blood vessel. If it is the target artery or target vein, the vascular puncture and catheterization assembly is further punctured into the target blood vessel. After the rigid outer tube punctures the blood vessel, the movable plate is adjusted from the first position to the second position. At this time, part of the movable plate protrudes from the penetration opening, and the movable plate abuts against the outer wall of the blood vessel, preventing the rigid outer tube from extending too far into the blood vessel and reducing the occurrence of serious collateral damage such as damage to the posterior wall of the blood vessel due to excessive puncture.

[0009] In one possible implementation of this application, the movable plate is provided with a first connecting part at one end near the outer segment, and the through-hole is provided with a second connecting part on the inner wall of one side near the outer segment. The first connecting part and the second connecting part are rotatably connected so that the movable plate can switch between the first position and the second position.

[0010] In one possible implementation of this application, a torsion spring is provided between the first connecting portion and the second connecting portion, and the torsion spring always applies a force to the movable plate toward the second position.

[0011] In one possible implementation of this application, the vascular puncture and catheterization assembly further includes: a pull cord, the pull cord having a first end and a second end opposite to each other, the first end being connected to the movable plate, the second end extending toward the external segment and passing through the port of the external segment opposite to the internal segment, the second end being connected to a collar; and a first positioning post, the first positioning post being disposed on the circumferential outer side of the external segment, wherein when the movable plate is in the first position, the collar is detachably fitted onto the first positioning post, and the pull cord is in a taut state.

[0012] In one possible implementation of this application, the vascular puncture and catheterization assembly further includes: a second positioning post, which is located on the circumferential outer side of the external segment and on the side of the first positioning post opposite to the internal segment. When the movable plate is in the second position, the collar is detachably sleeved on the second positioning post.

[0013] In one possible implementation of this application, the vascular puncture and catheterization assembly further includes: a threaded microtube disposed on the inner wall of the rigid outer tube, and the pull cord being threaded through the threaded microtube.

[0014] In one possible implementation of this application, the vascular puncture and catheterization assembly further includes: an abutment block disposed on the inner wall of the internal segment and opposite to the penetration port; when the movable plate is in the first position, the movable plate is located inside the rigid outer tube and abuts against the soft inner tube, and the movable plate and the abutment block cooperate to clamp the soft inner tube.

[0015] In one possible implementation of this application, the movable plate includes an abutment surface facing the abutment block, and when the movable plate is in a first position, the abutment surface abuts against the soft inner tube.

[0016] In one possible implementation of this application, the abutting surface is provided with an abutting protrusion, which protrudes from a portion of the abutting surface toward the abutting block.

[0017] In one possible implementation of this application, the number of abutting protrusions is multiple, and the multiple abutting protrusions are spaced apart.

[0018] In one possible implementation of this application, the abutment block includes a guide surface facing the outer segment, and the guide surface is inclined toward the through opening in the direction from the outer segment toward the inner segment. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 A schematic diagram of a vascular puncture and catheterization assembly provided in some embodiments of this application; Figure 2 for Figure 1 The diagram shows the movable plate of the vascular puncture and catheterization assembly in the second position; Figure 3 for Figure 1 The enlarged view of point A shown in the image.

[0022] Figure label: 100. Vascular puncture and catheterization kit; 110. Rigid outer tube; 111. Inner segment; 112. Outer segment; 113. Penetration port; 120. Flexible inner tube; 130. Abutment block; 131. Guide surface; 140. Movable plate; 141. First connecting part; 143. Abutting surface; 144. Abutting protrusion; 180. Blood oxygen sensor; 181. Dual-color indicator light; 190. Pull rope; 191. First locking post; 192. Second locking post; 193. Threading tube. Detailed Implementation

[0023] To better understand the above-mentioned objectives, features, and advantages of the present invention, the solutions of the present invention will be further described below. It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other.

[0024] Many specific details are set forth in the following description in order to provide a full understanding of the invention, but the invention may also be practiced in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of the invention, and not all embodiments.

[0025] In clinical practice today, vascular puncture and catheterization are often required. Common types of vascular puncture and catheterization include central venous catheterization and arterial puncture and catheterization.

[0026] Indications for central venous catheterization include: Critical care: Severe trauma, shock, acute circulatory failure requiring rapid volume expansion, or monitoring of central venous pressure to assess volume status. Surgical needs: Cardiovascular surgery under cardiopulmonary bypass, off-pump surgery with anticipated significant hemodynamic fluctuations, and intraoperative and postoperative monitoring during major and medium-sized surgeries. Special treatments: Long-term infusion of hypertonic nutrition, irritating / corrosive drugs; placement of temporary / permanent pacemakers, floating catheters; continuous hemofiltration, hemodialysis, and plasma exchange.

[0027] Indications for arterial puncture and catheterization include: Hemodynamic monitoring: Continuous invasive monitoring of arterial blood pressure is required during major surgeries and intensive care to promptly capture blood pressure fluctuations. Frequent blood sampling: Repeated arterial blood sampling is necessary for blood gas analysis and electrolyte / lactate testing to avoid repeated puncture damage. Special procedures / treatments: Cardiovascular interventional procedures (such as coronary angiography and peripheral angiography) require establishing an arterial access; shock resuscitation requires precise guidance on fluid resuscitation and vasopressor administration; some blood purification treatments require arterial access.

[0028] Clinically, based on the above needs, sometimes arterial puncture is required, and sometimes venous puncture is necessary. Currently, vascular puncture and catheter placement generally requires inserting the puncture into the blood vessel before determining whether it is an artery or vein. This often necessitates multiple punctures to ensure the correct target vessel is punctured, increasing the risk of accidental puncture of arteries or veins and raising the possibility of accidental vascular injury. Simultaneously, this procedure can reduce the risk of vascular wall damage of varying degrees and severity during vascular puncture. To address these technical issues, please refer to [link to relevant documentation]. Figures 1 to 3 This application provides a vascular puncture and catheterization assembly 100, which may include a rigid outer tube 110, a soft inner tube 120, an abutment block 130, a movable plate 140, and a blood oxygen detection sensor 180.

[0029] Specifically, the rigid external tube 110 can be made of metal, such as stainless steel or nickel-titanium alloy. The rigid external tube 110 is formed into a cylindrical tubular structure. In the extension direction of the rigid external tube 110, there are connected internal segments 111 and external segments 112. The internal segments 111 and external segments 112 can be integrally formed. During the operation of the vascular puncture and catheterization assembly 100, the free end of the internal segment 111 faces the patient's target treatment area. When the rigid external tube 110 is inserted into the patient's tissue and reaches the target blood vessel, the free end of the internal segment 111 is used to puncture the blood vessel to provide a channel for the soft internal tube 120 to continue to penetrate. At this time, the internal segment 111 is located inside the patient's body, and the external segment 112 is located outside the patient's body.

[0030] It is understandable that, for different operational requirements and blood vessels in different tissue locations, the length of the rigid external tube 110 extending into the patient's tissue may vary, and the portion of the internal segment 111 near the external segment 112 may also be located outside the patient's body.

[0031] Furthermore, the inner wall of the inner segment 111 is provided with a through-hole 113. Specifically, the through-hole 113 is located near the free end of the inner segment 111. The distance between the inner wall of the through-hole 113 near the free end of the inner segment 111 and the free end of the inner segment 111 is greater than or equal to 0.5 mm and less than or equal to 2 mm.

[0032] In the specific implementation process, the through-hole 113 is formed as an elongated hole. The length direction of the through-hole 113 is consistent with the extension direction of the rigid outer tube 110. The distance between the inner wall of the through-hole 113 near the free end of the inner section 111 and the free end of the inner section 111 can be 0.5mm, 1mm, 1.5mm or 2mm, etc.

[0033] Of course, in order to enable the rigid outer tube 110 to penetrate the patient's tissues and blood vessels, the free end of the inner segment 111 can be formed into a beveled sharp blade structure.

[0034] The outer diameter of the flexible inner tube 120 is smaller than the outer diameter of the rigid outer tube 110, and the flexible inner tube 120 is movably inserted inside the rigid outer tube 110. The material of the flexible inner tube 120 can be polytetrafluoroethylene, Teflon, etc.

[0035] The abutment block 130 is disposed on the inner wall of the inner section 111 and is disposed opposite to the through opening 113. The abutment block 130 can be formed into a rectangular block shape, and the surface of the abutment block 130 facing the through opening 113 can be formed into an arc-shaped surface that is compatible with the soft inner tube 120.

[0036] Furthermore, the abutment block 130 includes a guide surface 131 facing the outer section 112. In the direction from the outer section 112 to the inner section 111, the guide surface 131 is inclined toward the through opening 113. It should be noted that when the soft inner tube 120 is inserted into the hard outer tube 110 and the insertion operation continues, by setting the guide surface 131 at an inclination, the soft inner tube 120 can pass through the inner section 111 along the inclined guide surface 131 and continue to move toward the free end of the inner section 111, which can avoid the abutment block 130 blocking the movement of the soft inner tube 120.

[0037] The movable plate 140 is movably disposed in the through opening 113. The movable plate 140 includes a first position and a second position. When the movable plate 140 is in the first position (e.g., Figure 1 (The position of the movable plate 140 shown in the figure) The movable plate 140 is located inside the rigid outer tube 110 and abuts against the flexible inner tube 120. The movable plate 140 cooperates with the abutment block 130 to clamp the flexible inner tube 120. When the movable plate 140 is in the second position (e.g.) Figure 2 (as shown in the position of the movable plate 140), at least a portion of the movable plate 140 extends through the through-hole 113.

[0038] The blood oxygen detection sensor 180 is located at the end of the in vivo segment 111 opposite to the external segment 112. The blood oxygen detection sensor 180 can be a blood oxygen photoelectric detection sensor.

[0039] It should be noted that, according to the principle of the blood oxygen detection sensor 180, blood oxygen is detected by working with a dual-wavelength light source of red and infrared light: oxygenated hemoglobin is more red and will absorb more infrared light and reflect more red light; deoxygenated hemoglobin is the opposite. The blood oxygen detection sensor 180 calculates blood oxygen saturation by comparing the absorption ratio of the two types of light.

[0040] When the blood oxygen detection sensor 180 approaches the target blood vessel, specifically when the free end of the in vivo segment 111 comes into contact with the target blood vessel, if the detected blood oxygen saturation is greater than 95%, the target blood vessel is an artery; if the detected blood oxygen saturation is less than 75%, the target blood vessel is a vein.

[0041] In this way, when using the vascular puncture and catheterization assembly 100 provided in this application, medical personnel first align the vascular puncture and catheterization assembly 100 with the patient's target area. At this time, the movable plate 140 is in the first position, and the soft inner tube 120 and the rigid outer tube 110 are fixed in position by the movable plate 140 and the abutment block 130. Medical personnel puncture the rigid outer tube 110 and the soft inner tube 120 toward the target position. When the target position is reached, the blood oxygen detection sensor 180 can detect the blood vessel to determine whether the blood vessel is an artery or a vein. If it is the target artery or the target vein, the vascular puncture and catheterization assembly 100 is further punctured into the target blood vessel. When the rigid outer tube 110 punctures the blood vessel, the movable plate 140 is adjusted from the first position to the second position. At this time, part of the movable plate 140 protrudes through the penetration port 113 and abuts against the outer wall of the blood vessel, avoiding excessive insertion of the rigid outer tube 110 into the blood vessel and reducing the occurrence of serious collateral damage such as damage to the posterior wall of the blood vessel due to excessive puncture.

[0042] At this time, the soft inner tube 120 can move relative to the rigid outer tube 110 to continue to penetrate the blood vessel for the operation. When the soft inner tube 120 is punctured to the treatment position and fully inserted, the movable plate 140 is adjusted from the second position to the first position, and the rigid outer tube 110 is pulled out to complete the puncture operation.

[0043] During the removal of the rigid external tube 110, adjusting the movable plate 140 from the first position to the second position can minimize the possibility of damage to the tissues surrounding the blood vessels caused by the movable plate 140 extending out of the rigid external tube 110.

[0044] It should be noted that the end of the soft inner tube 120 facing the blood vessel is provided with a marker post, and at least a portion of the marker post can block X-rays from passing through so that it can be visualized in X-ray images.

[0045] In some embodiments of this application, the movable plate 140 is provided with a first connecting part 141 at one end near the external section 112, and the through opening 113 is provided with a second connecting part on the inner wall of one side near the external section 112. The first connecting part 141 and the second connecting part are rotatably connected so that the movable plate 140 can switch between a first position and a second position.

[0046] Specifically, the movable plate 140 is formed in the shape of a fan. The smaller end of the fan-shaped movable plate 140 is located close to the external section 112. Through the rotation between the first connecting part 141 and the second connecting part, the larger end of the fan-shaped movable plate 140 can extend out of the through-hole 113 to achieve contact with the outer wall of the blood vessel.

[0047] Furthermore, a torsion spring is provided between the first connecting part 141 and the second connecting part, and the torsion spring always applies a force to the movable plate 140 to move toward the second position.

[0048] Specifically, the first connecting part 141 is formed as a rotating column, and the second connecting part is formed as a rotating groove. The rotating groove is rotatably sleeved on the rotating column. The torsion spring includes a torsion spring body, a first pin, and a second pin. The torsion spring body is sleeved on the rotating column, the first pin is fixed to the rotating column, and the second pin extends out and abuts against the inner wall of the rigid outer tube 110, so as to realize that the torsion spring applies a force to the movable plate 140 to rotate from the first position to the second position.

[0049] In some embodiments of this application, the vascular puncture and catheterization assembly 100 may further include a pull cord 190 and a first positioning post. The pull cord 190 includes a first end and a second end opposite to each other. The first end is connected to the movable plate 140, and the second end extends toward the external section 112 and passes through the port of the external section 112 away from the internal section 111. The second end is connected to a collar. The first positioning post is located on the circumferential outer side of the external section 112. When the movable plate 140 is in the first position, the collar is detachably sleeved on the first positioning post, and the pull cord 190 is in a taut state.

[0050] In this way, by setting up the pull rope 190, medical staff can pull the second end of the pull rope 190 to rotate the movable plate 140 located in the second position to the first position.

[0051] Specifically, the movable plate 140 is provided with a connecting hole, and the first end passes through the connecting hole to achieve a binding connection with the movable plate 140. Furthermore, the distance between the connecting hole and the end of the movable plate 140 away from the external segment 112 is less than the distance between the connecting hole and the end of the movable plate 140 close to the external segment 112. In this way, medical staff can move the movable plate 140 from the second position to the first position with a smaller pulling force. The second end has a ring-shaped structure, and the first locking post 191 is cylindrical. The ring can be fitted around the outer circumference of the first locking post 191 to position the movable plate 140 in the first position.

[0052] Furthermore, the vascular puncture and catheterization assembly 100 may also include a second positioning post 192, which is located on the circumferential outer side of the external segment 112. The second positioning post 192 is located on the side of the first positioning post 191 opposite to the internal segment 111. When the movable plate 140 is in the second position, the collar is detachably fitted onto the second positioning post.

[0053] Thus, it can be understood that by setting the second locking post 192, the rotational transition of the movable plate 140 can be avoided, thus preventing the movable plate 140 from completely detaching from the rigid outer tube 110.

[0054] In some embodiments of this application, the vascular puncture and catheterization assembly 100 may further include: a threaded microtube 193 disposed on the inner wall of the rigid outer tube 110, and a pull cord 190 threaded through the threaded microtube 193.

[0055] Therefore, by setting the threading microtube 193, interference between the soft inner tube 120 and the pull rope 190 can be avoided when the soft inner tube 120 moves between the hard outer tube 110, thus preventing the soft inner tube 120 from operating normally.

[0056] In some embodiments of this application, the movable plate 140 includes an abutment surface 143 facing the abutment block 130, and when the movable plate 140 is in a first position, the abutment surface 143 abuts against the flexible inner tube 120.

[0057] Therefore, by setting the contact surface 143, the surface contact between the movable plate 140 and the soft inner tube 120 is achieved, the friction between the movable plate 140 and the soft inner tube 120 is increased, and the stability of the fixed connection between the soft inner tube 120 and the hard outer tube 110 is ensured.

[0058] Furthermore, the abutting surface 143 is provided with an abutting protrusion 144, which protrudes from a portion of the abutting surface 143 toward the abutting block 130.

[0059] Furthermore, there are multiple abutment protrusions 144, which are spaced apart. Thus, by providing multiple abutment protrusions 144, the roughness of the abutment surface 143 can be further improved, and the friction between the movable plate 140 and the flexible inner tube 120 can be further improved.

[0060] In some embodiments of this application, the vascular puncture and catheterization assembly 100 may further include a dual-color indicator light 181. The dual-color indicator light 181 is disposed on the outer wall of the external segment 112. The dual-color indicator light 181 is electrically connected to the blood oxygen detection sensor 180. When the blood oxygen monitoring sensor detects that the blood oxygen saturation is greater than 95%, the dual-color indicator light 181 lights up the first color. When the blood oxygen detector detects that the blood oxygen saturation is less than 75%, the dual-color indicator light 181 lights up the second color, thereby helping medical staff to identify whether the blood vessel is an artery or a vein.

[0061] Furthermore, a power supply, controller, and other electrical components can be electrically connected between the dual-color indicator light 181 and the blood oxygen detection sensor 180. The power supply is used to power the dual-color indicator light 181, the blood oxygen detection sensor 180, and the controller. The controller is used to receive the electrical signal from the blood oxygen detection sensor 180 and then convert and transmit the signal to the dual-color indicator light 181 to control the lighting color of the dual-color indicator light 181.

[0062] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0063] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features of the invention herein.

Claims

1. A vascular puncture and catheter placement assembly, characterized in that, include: A rigid outer tube, comprising a connected inner section and an outer section, wherein the side wall of the inner section is provided with a through opening; A flexible inner tube, which is movably inserted into the rigid outer tube; A movable plate is movably disposed in the through-hole. The movable plate has a first position and a second position. When the movable plate is in the first position, it is located inside the rigid outer tube and abuts against the flexible inner tube. The movable plate cooperates with the inner wall of the rigid outer tube to clamp the flexible inner tube. When the movable plate is in the second position, at least a portion of the movable plate protrudes through the through-hole. A blood oxygen detection sensor, wherein the blood oxygen detection sensor is located at the end of the in vivo segment opposite to the external segment.

2. The vascular puncture and catheterization assembly according to claim 1, characterized in that, The movable plate is provided with a first connecting part at one end near the outer section, and the through opening is provided with a second connecting part on the inner wall of one side near the outer section. The first connecting part and the second connecting part are rotatably connected so that the movable plate can switch between the first position and the second position.

3. The vascular puncture and catheterization assembly according to claim 2, characterized in that, A torsion spring is provided between the first connecting part and the second connecting part, and the torsion spring always applies a force to the movable plate toward the second position.

4. The vascular puncture and catheterization assembly according to claim 2, characterized in that, Also includes: A pull rope, comprising a first end and a second end opposite to each other, the first end being connected to the movable plate, the second end extending toward the outer section and passing through the port of the outer section opposite to the inner section, and the second end being connected to a collar; The first locking post is located on the circumferential outer side of the outer body section. When the movable plate is in the first position, the collar is detachably fitted onto the first locking post, and the pull rope is in a taut state.

5. The vascular puncture and catheterization assembly according to claim 4, characterized in that, Also includes: The second positioning post is located on the circumferential outer side of the external segment and on the side of the first positioning post away from the internal segment. When the movable plate is in the second position, the collar is detachably fitted onto the second positioning post.

6. The vascular puncture and catheterization assembly according to claim 4, characterized in that, Also includes: A threading microtube is disposed on the inner wall of the rigid outer tube, and the pull rope is threaded through the threading microtube.

7. The vascular puncture and catheterization assembly according to claim 1, characterized in that, Also includes: An abutment block is disposed on the inner wall of the inner section of the body and is opposite to the through opening; When the movable plate is in the first position, the movable plate is located inside the rigid outer tube and abuts against the soft inner tube. The movable plate and the abutting block cooperate to clamp the soft inner tube.

8. The vascular puncture and catheterization assembly according to claim 7, characterized in that, The movable plate includes an abutting surface facing the abutting block, and when the movable plate is in the first position, the abutting surface abuts against the soft inner tube.

9. The vascular puncture and catheterization assembly according to claim 8, characterized in that, The abutting surface is provided with abutting protrusions, which protrude from a portion of the abutting surface toward the abutting block.

10. The vascular puncture and catheterization assembly according to claim 7, characterized in that, The abutment block includes a guide surface facing the outer segment, and the guide surface is inclined toward the through-hole in the direction from the outer segment toward the inner segment.

Images