Central venous catheter suite for ultrasound-guided puncture

Abstract

The invention belongs to the field of medical instruments, and discloses a central venous catheter suite for ultrasonic guided puncture, which can simplify the process steps during single-person and single-hand operation so as to greatly improve the efficiency of central venous catheterization, and comprises a shell and a cannula unit, the shell is provided with a puncture guide channel, and the puncture guide channel is provided with a puncture opening; the cannula unit comprises a puncture needle tube, a vein built-in tube and an indwelling catheter guide wire, the vein built-in tube is provided with an indwelling catheter end section, the indwelling catheter guide wire is provided with an in-vivo screw end section, the puncture needle tube, the indwelling catheter end section and the in-vivo screw end section are sequentially connected in a sleeved mode from outside to inside, and the puncture needle tube, the indwelling catheter end section, the in-vivo screw end section and a puncture guide channel all extend in the same direction; the puncture needle tube is arranged in the puncture guide channel, the tip of the puncture needle tube is located beside the puncture opening and faces the puncture opening, the puncture needle tube can move relative to the puncture guide channel, the catheter guide wire can move relative to the puncture needle tube, and the intravenous catheter can move relative to the catheter guide wire.

Description

Technical Field

[0001] The present invention belongs to the field of medical devices and discloses a central venous catheter kit for ultrasound-guided puncture. Background Art

[0002] Central venous puncture and catheterization is a technique of puncturing through the body surface to the corresponding vein and inserting various catheters into the large blood vessel lumen or the heart cavity. It is used to measure various physiological parameters and also provides a direct and convenient route for various treatments. It is an indispensable means in the intensive care unit, major surgeries, and the treatment of critically ill patients.

[0003] An important implementation tool for central venous puncture and catheterization: The central venous catheter and the central venous puncture kit are important tools for establishing venous access. Currently, they are generally designed and produced based on the Seldinger technique principle. The Seldinger technique, also known as the micro-intubation sheath technique (MST), is a technique of percutaneous puncture and catheter insertion using a guide wire exchange method. This technique was invented by a radiologist named Seldinger in Sweden in 1953.

[0004] With the popularization of ultrasound equipment, the ultrasound-guided puncture technique has been widely used to guide puncture and catheterization and interventional therapy. Currently, the process of central venous puncture and catheterization with the cooperation of an ultrasound probe is as follows: First, the operator holds the ultrasound probe with one hand and applies the probe to the corresponding body surface of the patient to locate and display the vein to be punctured and catheterized. After the blood vessel is displayed, the puncture target and the puncture path are determined; while the blood vessel and its surrounding structures are displayed on the ultrasound device, the operator holds the puncture needle with the other hand, pierces the skin, and under the guidance of the ultrasound image, guides the puncture needle into the target venous blood vessel. This process requires the coordinated cooperation of the operator's left and right hands to real-time display the image of the puncture needle in the central venous blood vessel. Then, keeping the puncture needle stable, obtain a pre-prepared guide wire from the vicinity, slowly insert the guide wire through the puncture needle tube, and extend the guide wire a predetermined length along the extension direction of the central venous blood vessel. At the same time, ensure that the ultrasound probe tracks the image of the guide wire in the central vein. And in the above two steps, it is necessary to prevent the guide wire from being damaged due to interference with the puncture needle tube, and prevent the puncture needle and the guide wire from shifting and slipping. Finally, remove the puncture needle tube from the guide wire outside the body of the person to be catheterized, put the indwelling catheter outside the guide wire, and slowly push it into the central vein of the person to be catheterized along the guide wire. During this process, it is necessary to avoid impact damage to the central vein by the puncture needle and the indwelling catheter, and avoid displacement, so as to ensure the safety and comfort of the person to be catheterized, and then withdraw the guide wire to complete the catheterization work.

[0005] However, the deficiencies of this implementation method are also obvious: if one operator is involved, the process will be too complicated, and any improper action during the process will cause the displacement of the puncture needle and guide wire, or cause damage to the patient or discomfort to the patient; if two operators are involved, due to the relatively small operation space corresponding to the external area, action interference is likely to occur, resulting in damage to the guide wire or discomfort to the catheterized person. And in either of the above situations, the efficiency of central venous catheterization is greatly reduced. Summary of the Invention

[0006] Aiming at the deficiencies of the prior art, the present invention provides a central venous catheter kit for ultrasound-guided puncture, which can simplify the process steps during single-person and single-hand operation, thereby greatly improving the efficiency of central venous catheterization.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A central venous catheter kit for ultrasound-guided puncture, characterized by comprising: a housing having a puncture guiding channel, the puncture guiding channel extending linearly and having a puncture opening portion open to the outside, with the extending direction being the puncture direction; a cannula unit including a puncture needle tube, an intravascular catheter, and a catheter guide wire. Among them, the intravascular catheter has an inserted tube end segment close to the puncture opening portion, and the catheter guide wire has a body wire end segment close to the puncture opening portion. The puncture needle tube, the inserted tube end segment, and the body wire end segment are sleeved from outside to inside in sequence. The puncture needle tube, the inserted tube end segment, the body wire end segment, and the puncture guiding channel all extend along the puncture direction. The puncture needle tube is arranged in the puncture guiding channel, and the tip of the puncture needle tube is located near the puncture opening portion and faces the puncture opening portion. The puncture needle tube is movable along the puncture direction relative to the puncture guiding channel, the catheter guide wire is movable along the puncture direction relative to the puncture needle tube, and the intravascular catheter is movable relative to the catheter guide wire. When performing central venous intravascular catheterization, the puncture opening portion is brought close to the body surface of the catheterized person, and the puncture needle tube is moved relative to the puncture guiding channel. When the body surface of the catheterized person is punctured and the predetermined vein is punctured, the catheter guide wire is moved relative to the puncture needle tube. The catheter guide wire enters the predetermined vein through the puncture needle tube. When the catheter guide wire enters the predetermined vein a predetermined length along the extending direction of the predetermined vein, the intravascular catheter is moved relative to the catheter guide wire, so that the intravascular catheter is inserted into the predetermined vein along the catheter guide wire.

[0009] Preferably, the housing further has a receiving cavity, the puncture guiding channel communicates with the receiving cavity, the housing is formed by buckling two identical half-housings, and the two half-housings equally divide the volumes of the puncture guiding channel and the receiving cavity.

[0010] Furthermore, the accommodating inner cavity has a pair of guide wire moving through-holes, and the puncture conduction channel has a pair of through-piercing inner tube moving through-holes. The guide wire moving through-holes are used to apply a clamping force to the external counter tube guide wire and enable the catheter guide wire to move relative to the puncture needle tube; the inner tube moving through-holes are used to apply a clamping force to the venous inner catheter from the outside and enable the venous inner catheter to move relative to the catheter guide wire.

[0011] Still further, the catheter guide wire straightly enters the accommodating inner cavity from the puncture guiding channel.

[0012] Still further, the present invention further includes a wire releasing assembly, including a wire winding wheel which is rotatably arranged inside the accommodating inner cavity, and the wire winding wheel further has a driving turning handle passing through the housing. The driving turning handle is used for being pinched and rotated by fingers to drive the wire winding wheel to rotate. The catheter guide wire has a winding fixed end opposite to the inserted tube end section. The catheter guide wire is fixed on the circumferential surface of the wire winding wheel through the winding fixed end, and part of the catheter guide wire is wound on the circumferential surface of the wire winding wheel.

[0013] Still further, the wire releasing assembly further includes a turning wheel which is rotatably arranged inside the accommodating inner cavity. The catheter guide wire led out from the wire winding wheel surrounds part of the circumferential surface of the turning wheel. Thus, after passing through the turning wheel, the extending direction of the catheter guide wire changes and enters the puncture guiding channel straightly.

[0014] Still further, the present invention further includes a damping increasing assembly, including a pair of guide wire pressing buttons and a pair of inner tube pressing buttons. The pair of guide wire pressing buttons are respectively inserted into the pair of guide wire moving through-holes correspondingly, and the guide wire pressing buttons are movable along the inserting direction. The pair of inner tube pressing buttons are respectively inserted into the pair of inner tube moving through-holes correspondingly, and the inner tube pressing buttons are movable along the inserting direction. The inner tube pressing buttons have the same structure as the guide wire pressing buttons. The guide wire pressing button includes an integrally continuous pressing end portion, an inserting rod portion and a damping increasing end portion. The pressing end portion forms a flange relative to the inserting rod portion, and a reset structure located outside the housing is arranged on the circumferential surface of the inserting rod portion. The pressing end portions of the guide wire pressing button and the inner tube pressing button are both used for applying pressure by fingers. The inserting rod portions of the guide wire pressing button and the inner tube pressing button are correspondingly inserted into the guide wire moving through-holes and the inner tube moving through-holes. The damping increasing end portions of the guide wire pressing button and the inner tube pressing button are used for correspondingly pressing the catheter guide wire and the venous inner catheter from the relative circumferential surfaces of the catheter guide wire and the venous inner catheter.

[0015] Furthermore, the reset structure is a conical circumferential surface along the extending direction of the insertion rod portion, and the large end of the reset structure is adjacent to the pressing end portion. When an external force pushes the damping-increasing end portion to be in damping contact with the venous indwelling catheter or the catheter guide wire through the pressing end portion, the reset structure interferes with the guide wire moving through hole or the indwelling catheter moving through hole, so that the surface of the reset structure undergoes elastic deformation and enters the inside of the guide wire moving through hole or the indwelling catheter moving through hole; when the external force is withdrawn, the reset structure elastically returns and thus exits from the inside of the guide wire moving through hole or the indwelling catheter moving through hole.

[0016] Furthermore, the present invention further includes a locking clip, which is in an inverted "U" shape and has two clamping ends, and the distance between the two clamping ends is the locking distance. The locking clip is used to correspondingly clamp the pressing end portions of two guide wire pressing buttons or the pressing end portions of two indwelling catheter pressing buttons through the two clamping ends, so that the guide wire pressing button clamps the catheter guide wire, that is, the catheter guide wire is fixed relative to the puncture needle tube; thus the indwelling catheter pressing button clamps the venous indwelling catheter, that is, the venous indwelling catheter is fixed relative to the catheter guide wire.

[0017] Preferably, the housing further has a needle driving waist groove extending along the puncture direction, and there are pin connecting ears on the opposite sides of the needle driving waist groove. A needle driving protrusion is further formed on the circumferential surface of the puncture needle tube. The driving protrusion is fitted to pass through the driving waist groove. When the driving protrusion moves relative to the puncture guiding channel, the puncture needle tube extends out or retracts into the inside of the puncture guiding channel. The pin connecting ears are used to fix the puncture needle tube relative to the housing by pin connecting the needle driving protrusion.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. Since the central venous catheter kit for ultrasound-guided puncture of the present invention includes a housing and a cannula unit, the housing has a puncture guiding channel with a puncture opening; the cannula unit includes a puncture needle tube, a venous indwelling tube, and a guide wire for indwelling. The venous indwelling tube has an indwelling tube end segment, and the guide wire for indwelling has an in-vivo wire end segment. The puncture needle tube, the indwelling tube end segment, and the in-vivo wire end segment are sleeved from outside to inside in sequence. The puncture needle tube, the indwelling tube end segment, the in-vivo wire end segment, and the puncture guiding channel all extend along the puncture direction. The puncture needle tube is arranged in the puncture guiding channel, and the tip of the puncture needle tube is located near the puncture opening and faces the puncture opening. The puncture needle tube is movable relative to the puncture guiding channel along the puncture direction, the guide wire for indwelling is movable relative to the puncture needle tube along the puncture direction, and the venous indwelling tube is movable relative to the guide wire for indwelling. When performing the operation of central venous indwelling, the puncture opening is brought close to the body surface of the person to be indwelled, and the puncture needle tube is moved relative to the puncture guiding channel. When piercing the body surface of the person to be indwelled and piercing into the predetermined vein, the guide wire for indwelling is moved relative to the puncture needle tube. The guide wire for indwelling enters the predetermined vein through the puncture needle tube. When the guide wire for indwelling enters the predetermined vein by a predetermined length along the extension direction of the predetermined vein, the venous indwelling tube is moved relative to the guide wire for indwelling. Thus, the venous indwelling tube is indwelled into the predetermined vein along the guide wire for indwelling. And throughout the whole process, an ultrasonic probe is used to perform real-time imaging tracking on the operation of central venous indwelling. Therefore, the present invention can simplify the process steps during single-person and single-hand operation, shorten the puncture indwelling time, and reduce the possibility of needle displacement during the operation, thereby greatly improving the efficiency of central venous indwelling.

[0020] 2. Since the housing of the present invention further has a receiving cavity, the puncture guiding channel communicates with the receiving cavity. The housing is formed by buckling two identical half-housings, and the two half-housings equally divide the volumes of the puncture guiding channel and the receiving cavity. Therefore, the guide wire and the venous indwelling tube of the present invention are received inside the housing, so that there is no need to set multiple placement locations, which is convenient for storage. In particular, it also avoids bacterial infection caused by the influence of the environment on the guide wire and the indwelling tube. And the form of buckling of the two half-housings also makes different structures on the housing easy to be injection-molded.

[0021] 3. Since the receiving cavity of the present invention has a pair of guide wire moving through holes, and the puncture conducting channel has a pair of through indwelling tube moving through holes. The guide wire moving through holes are used to apply a clamping force to the guide wire for indwelling from the outside and make the guide wire for indwelling move relative to the puncture needle tube; the indwelling tube moving through holes are used to apply a clamping force to the venous indwelling tube from the outside and make the venous indwelling tube move relative to the guide wire for indwelling. Therefore, the present invention is convenient for moving the guide wire or the venous indwelling tube by using the index finger and the thumb.

[0022] 4. Since the guide wire for indwelling of the present invention enters the receiving cavity straightly from the puncture guiding channel, the guide wire for indwelling of the present invention is conducive to realizing the wire feeding or wire retracting action from the receiving cavity into the puncture guiding channel.

[0023] 5. Since the present invention further includes a wire feeding assembly, which includes a wire winding wheel rotatably arranged inside the accommodating cavity, and the wire winding wheel also has a driving crank handle passing through the housing for pinching and rotating by fingers to drive the wire winding wheel to rotate. The catheter placement guide wire has a winding and fixing end opposite to the end section of the placement catheter. The catheter placement guide wire is fixed on the circumferential surface of the wire winding wheel through the winding and fixing end, and part of the catheter placement guide wire is wound on the circumferential surface of the wire winding wheel. Therefore, the present invention can wind most of the catheter placement guide wire on the circumferential surface of the wire winding wheel, facilitating the single-handed driving of the wire winding wheel by the relevant operating physician, thereby realizing the wire collecting action of the catheter placement guide wire, and this structure makes the overall occupied space of the device smaller and the structure more compact.

[0024] 6. Since the wire feeding assembly of the present invention further includes a turning wheel rotatably arranged inside the accommodating cavity, and the catheter placement guide wire led out from the wire winding wheel wraps around part of the circumferential surface of the turning wheel. Thus, after passing through the turning wheel, the extending direction of the catheter placement guide wire changes and enters the puncture guiding channel straightly. Therefore, the present invention extends the length of the bare wire of the catheter placement guide wire led out from the wire winding wheel before inserting the intravenous catheter through the turning wheel, facilitating the setting of the wire moving through hole.

[0025] 7. Since the present invention further includes a damping increasing assembly, which includes a pair of wire pressing buttons and a pair of inner catheter pressing buttons. The pair of wire pressing buttons are respectively inserted into a pair of wire moving through holes correspondingly, and the wire pressing buttons are movable along the inserting direction. The pair of inner catheter pressing buttons are respectively inserted into a pair of inner catheter moving through holes correspondingly, and the inner catheter pressing buttons are movable along the inserting direction. The inner catheter pressing buttons have the same structure as the wire pressing buttons. The wire pressing button includes an integrally continuous pressing end, an inserting rod part, and a damping increasing end. The pressing end forms a flange relative to the inserting rod part, and a reset structure located outside the housing is provided on the circumferential surface of the inserting rod part. The pressing ends of both the wire pressing button and the inner catheter pressing button are used for applying pressure by fingers. The inserting rod parts of the wire pressing button and the inner catheter pressing button are correspondingly inserted into the wire moving through hole and the inner catheter moving through hole. The damping increasing ends of the wire pressing button and the inner catheter pressing button are used for correspondingly pressing the catheter placement guide wire and the intravenous catheter from the relative circumferential surfaces of the catheter placement guide wire and the intravenous catheter. Therefore, the present invention clamps the catheter placement guide wire and the intravenous catheter correspondingly by pressing or releasing the wire pressing button and the inner catheter pressing button, and increases the damping friction generated by the finger-applied force on the catheter placement guide wire and the intravenous catheter through the damping increasing ends, so as to facilitate the relevant operating physician to pinch the damping increasing ends with the fingertips of the index finger and thumb of one hand and move the catheter placement guide wire and the intravenous catheter by using the damping friction.

[0026] 8. Because the reset structure of the present invention is a conical circumferential surface along the extension direction of the insertion rod, and the large end of the reset structure is adjacent to the pressing end, when the external force pushes the damping increasing end to contact the intravenous catheter or the catheter guide wire damping through the pressing end, the reset structure interferes with the guide wire moving through hole or the built-in tube moving through hole, so that the surface of the reset structure is elastically deformed and enters the guide wire moving through hole or the built-in tube moving through hole; when the external force is removed, the reset structure elastically recovers and withdraws from the guide wire moving through hole or the built-in tube moving through hole. Therefore, the present invention The elastic inclined surface of the movable through hole is matched, so when the relevant operating physician removes the index finger and thumb that are pinching the damping enlarged end, the conical circumference and the guide wire movable through hole or the inserted tube movable through hole undergo self-movement of the inclined surface recovery, thereby releasing the damping contact between the damping enlarged end and the catheter guide wire or the intravenous catheter, facilitating the movement of the damping enlargement component relative to the shell, so that the relevant operating physician can realize the reciprocating movement of the damping enlargement component and form a tube or wire feeding action by pressing the movable catheter guide wire or the intravenous catheter through one hand operation. In particular, the reset structure is simple in structure and can be directly realized by the injection molding process.

[0027] 9. Because the present invention also includes a locking clamp, which is in an inverted "U" shape and has two clamping ends, and the spacing between the two clamping ends is a locking distance, the locking clamp is used to clamp the pressing ends of the two guide wire pressing buttons or the pressing ends of the two internal tube pressing buttons through the two clamping ends, so that the guide wire pressing button clamps the catheter guide wire, that is, the catheter guide wire is fixed relative to the puncture needle tube; and the internal tube pressing button clamps the intravenous catheter, that is, the intravenous catheter is fixed relative to the catheter guide wire. Therefore, the present invention clamps and fixes the catheter guide wire or the intravenous catheter through the locking clamp, so that it is convenient for the doctor to operate without related operations, that is, when the catheter guide wire is fed relative to the puncture needle tube, the intravenous catheter is fixed relative to the puncture needle tube, and when the intravenous catheter is moved relative to the shell and inserted into the human body, the catheter guide wire is fixed relative to the shell.

[0028] 10. Because the shell of the present invention also has a needle-driving waist groove extending along the puncture direction, a needle-driving protrusion is also formed on the circumferential surface of the puncture needle tube, and the driving protrusion cooperates to pass through the driving waist groove. When the driving protrusion moves relative to the puncture guide channel, the puncture needle tube extends out or retracts into the interior of the puncture guide channel. Therefore, the present invention realizes the relative position of the puncture needle tube to the shell through a simple structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of a central venous catheter kit for ultrasound-guided puncture according to an embodiment of the present invention;

[0030] Figure 2 It is a schematic structural diagram of a central venous catheter kit for ultrasound-guided puncture according to an embodiment of the present invention;

[0031] Figure 3 An exploded view of the central venous catheter kit for ultrasound-guided puncture according to an embodiment of the present invention (the puncture needle tube is sketched, and part of the intravascular catheter is shown);

[0032] Figure 4 A schematic diagram of the cooperation between the cannula unit and the wire feeding assembly of the present invention;

[0033] Figure 5 is Figure 1 The A-A sectional view of;

[0034] Figure 6 A cooperation diagram of the locking clip and the damping increasing assembly of the present invention;

[0035] Figure 7 A unilateral exploded view of the locking clip and the damping increasing assembly of the present invention.

[0036] In the figure: 100, a central venous catheter kit for ultrasound-guided puncture; D, the puncture direction; 10, a housing; 10A, a semi-housing; 10a, a puncture guiding channel; 10b, a receiving cavity; 10c, a puncture opening; 10d, a through hole for the movement of the intravascular catheter; 10e, a through hole for the movement of the guide wire; 10f, a driving opening; 10g, a pin connecting ear; 20, a cannula unit; 21, a puncture needle tube; 211, a needle driving protrusion; 22, an intravascular catheter; 23, a catheter guide wire; 23a, a turning section; 30, a wire feeding assembly; 31, a wire winding wheel; 311, a driving turning handle; 32, a turning wheel; 41, an intravascular catheter pressing button; 411, a pressing end; 411a, a matching recess; 412, an inserting rod part; 4121, a reset structure; 413, a damping increasing part; 42, a guide wire pressing button; 50, a locking clip; 51, a clamping end; 51a, a positioning convex point; 52, a strengthening part. Detailed implementation manners

[0037] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the following embodiments will specifically describe the central venous catheter kit for ultrasound-guided puncture of the present invention in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation to the present invention.

[0038] As Figure 1 and Figure 2 shown, the central venous catheter kit 100 for ultrasound-guided puncture in this embodiment includes a housing 10, a cannula unit 20, a wire feeding assembly 30, a damping increasing assembly and a locking clip 50. Specifically, the central venous catheter kit 100 for ultrasound-guided puncture is used to face the body surface of the person to be catheterized, penetrate the body surface and penetrate into a predetermined vein, and insert an intravascular catheter into the predetermined vein.

[0039] As shown Figure 3 in FIG. 1, the housing 10 is formed by snap - fitting two identical half - housings 10A. Inside the housing 10, there are formed a puncture guiding channel 10a, a receiving cavity 10b, an inner tube moving through - hole 10d, a guide wire moving through - hole 10e, and a needle driving waist groove (not shown in the drawings) that are in communication with each other. And the two half - housings 10A bisect the volumes of the puncture guiding channel 10a and the receiving cavity 10b.

[0040] The puncture guiding channel 10a extends in a straight line and has a puncture opening 10c that opens to the outside. Taking the extending direction as the puncture direction D, specifically, the puncture opening 10c faces the body surface of the catheterized person. Along the puncture direction D, the puncture guiding channel 10a is closer to the body surface of the catheterized person than the receiving cavity 10b.

[0041] The number of the inner tube moving through - holes 10d and the guide wire moving through - holes 10e is one pair each. The puncture conducting channel 10a opens to the outside of the housing 10 through a pair of inner tube moving through - holes 10d, and the receiving cavity 10b opens to the outside of the housing 10 through a pair of guide wire moving through - holes 10e. Specifically, a pair of inner tube moving through - holes 10d and a pair of guide wire moving through - holes 10e are oppositely arranged on the housing 10.

[0042] Specifically, on the half - housing 10A, there is also formed a driving rotation opening 10f that is in communication with the receiving cavity 10b and opens the receiving cavity 10b to the outside. In this embodiment, at least one half - housing 10A is formed with the driving rotation opening 10f.

[0043] The needle driving waist groove extends along the puncture direction D, and the opposite sides of the needle driving waist groove have pin - connecting ears 10g. Specifically, the needle driving waist groove is formed near the puncture opening 10c. Each mating end face of the half - housing 10A is formed with a needle driving half - groove (not shown in the drawings) that extends along the puncture direction D. When the two half - housings 10A are snap - fitted to form the housing 10, the two needle driving half - grooves form the needle driving waist groove. The number of the pin - connecting ears 10g is two pairs. The two pairs of pin - connecting ears 10g are respectively formed near the two ends of the needle driving waist groove along the puncture direction D, and each pair of pin - connecting ears 10g is respectively formed at the notch edge of the needle driving half - grooves of the two half - housings 10A. In this embodiment, one end of the needle driving waist groove opens to the outside.

[0044] As shown Figure 4 in FIG. 2, the cannula unit 20 includes a puncture needle tube 21, an intravenous inner tube 22, and a catheter - placing guide wire 23.

[0045] The puncture needle tube 21 is arranged in the puncture guiding channel 10a. The tip of the puncture needle tube 21 is located near the puncture opening 10c and faces the puncture opening 10c.

[0046] The intravascular catheter 22 has an inserted catheter end segment near the puncture orifice 10c (not shown in the drawings), the catheter guide wire 23 has a wire end segment inside the body near the puncture orifice 10c (not shown in the drawings), the puncture needle tube 21, the inserted catheter end segment, and the wire end segment inside the body are sleeved in sequence from outside to inside, and the puncture needle tube 21, the inserted catheter end segment, the wire end segment inside the body, and the puncture guiding channel all extend along the puncture direction D.

[0047] The puncture needle tube 21 is movable relative to the puncture guiding channel 10a along the puncture direction D, the catheter guide wire 23 is movable relative to the puncture needle tube 21 along the puncture direction D, the intravascular catheter 22 is movable relative to the catheter guide wire 23 along the puncture direction D, and the catheter guide wire 23 enters the accommodation lumen 10b straightly from the puncture guiding channel 10a. Specifically, the puncture needle tube 21 and the intravascular catheter 22 are in an elastic interference fit, and when the friction force between the puncture needle tube 21 and the intravascular catheter 22 is overcome, the puncture needle tube 21 and the intravascular catheter 22 can move relative to each other. The intravascular catheter 22 and the catheter guide wire 23 are in a clearance fit.

[0048] A needle driving protrusion 211 is further formed on the circumferential surface of the puncture needle tube 21. The driving protrusion 211 is fitted to pass through the driving waist groove. When an external force pushes the driving protrusion 211 to drive the puncture needle tube 21 to move relative to the puncture guiding channel 10a, the puncture needle tube 21 extends out or retracts into the interior of the puncture guiding channel 10a. The pin connecting ear 10g and the needle driving protrusion 211 have pin connecting holes (not shown in the drawings). The pin connecting ear 10g is used to fix the puncture needle tube 21 relative to the housing 10 at two positions by pin connecting the needle driving protrusion 211. Specifically, when the puncture needle tube 21 is fixed relative to the housing 10, the puncture needle tube 21 retracts into the puncture guiding channel 10a, or pierces the body surface of the catheterized person and pierces into the interior of the predetermined vein.

[0049] The built-in catheter moving through hole 10d corresponds to the intravascular catheter 22, and is used to apply a clamping force to the intravascular catheter 22 from the outside and make the intravascular catheter 22 move relative to the catheter guide wire 23; the guide wire moving through hole 10e corresponds to the catheter guide wire 23, and is used to apply a clamping force to the catheter guide wire 23 from the outside and make the catheter guide wire 23 move relative to the puncture needle tube 21.

[0050] The wire releasing assembly 30 is located inside the accommodation lumen 10b. The wire releasing assembly 30 includes a wire winding runner 31 and a turning wheel 32. Specifically, the minimum angle formed by the central connection line of the wire winding runner 31 and the turning wheel 32 and the puncture direction D is an acute angle greater than 45°.

[0051] The wire winding wheel 31 is rotatably arranged inside the accommodation cavity 10b, and the wire winding wheel 31 also has a driving rotation handle 311 passing through the housing 10. The driving rotation handle 311 is used to be pinched by fingers and apply force to drive its rotation, driving the wire winding wheel 31 to rotate. The catheter placement guide wire 23 has a winding and fixing end (not shown in the drawings) opposite to the catheter placement end segment. The catheter placement guide wire 23 is fixed on the circumferential surface of the wire winding wheel 31 through the winding and fixing end, and a part of the catheter placement guide wire 23 is wound around the circumferential surface of the wire winding wheel 31. Specifically, the driving rotation handle 311 passes through the housing 10 through the driving rotation opening 10f, and the driving rotation handle 311 is pinched and forcefully rotated by the index finger and thumb of one hand.

[0052] The steering wheel 32 is rotatably arranged inside the accommodation cavity 10b. The catheter placement guide wire 23 led out by the wire winding wheel 31 wraps around a part of the circumferential surface of the steering wheel 32. Thus, after the catheter placement guide wire 23 passes through the steering wheel 32, the extending direction changes and it enters the puncture guiding channel 10a straight along the puncture direction D. A section of the catheter placement guide wire 23 located between the puncture guiding channel 10a and the steering wheel 32 along the puncture direction D forms a folding section 23a.

[0053] As Figure 5 shown, the damping increasing assembly includes a pair of inner catheter pressing buttons 41 and a pair of guide wire pressing buttons 42. Specifically, the damping increasing assembly facilitates the relevant operating physician to apply a clamping force to the intravenous catheter 22 and the catheter placement guide wire 23 with the index finger and thumb of one hand from the outside of the inner catheter moving through hole 10d and the guide wire moving through hole 10e through the pressing buttons.

[0054] A pair of inner catheter pressing buttons 41 are respectively inserted into a pair of inner catheter moving through holes 10d, and the inner catheter pressing buttons 41 can be pressed and moved along the insertion direction. A pair of guide wire pressing buttons 42 are respectively inserted into a pair of guide wire moving through holes 10e, and the guide wire pressing buttons 42 can be moved along the insertion direction.

[0055] The inner catheter pressing button 41 has the same structure as the guide wire pressing button 42. The guide wire pressing button 42 includes an integrally continuous pressing end portion 411, an insertion rod portion 412, and a damping increasing end portion 413.

[0056] The pressing end portion 41 forms a flange relative to the insertion rod portion 412. Specifically, the relevant operating physician applies a clamping force to the intravenous catheter 22 and the catheter placement guide wire 23 by pressing the two pressing end portions 41 with fingers, and a matching depression 411a is also formed on the outer surface of the pressing end portion 41.

[0057] The circumferential surface of the insertion rod portion 412 is provided with a reset structure 4121 located outside the housing 10. The reset structure 4121 is a conical circumferential surface along the extending direction of the insertion rod portion 412, and the large end of the reset structure is adjacent to the pressing end portion 411. Specifically, the reset structure 4121 has shrinkage elasticity. Thus, when the insertion rod portion 412 penetrates into the inner tube movement through-hole 10d and the guide wire movement through-hole 10e under the action of the clamping force, the reset structure 4121 enters the inner tube movement through-hole 10d and the guide wire movement through-hole 10e through elastic deformation. After the clamping force is withdrawn, the reset structure 4121 automatically pops out from the inner tube movement through-hole 10d and the guide wire movement through-hole 10e through elastic recovery.

[0058] Specifically, the material of the damping increasing portion 413 is a material with a large friction coefficient. By contacting the venous inner tube 22 and the catheter guide wire 23, the venous inner tube 22 and the catheter guide wire 23 are fixed relative to the puncture needle tube 21. In this embodiment, the damping increasing portion 413 is in the shape of a cuboid, the length direction is greater than the width of the inner tube movement through-hole 10d and the guide wire movement through-hole 10e, and the width direction is less than the width of the inner tube movement through-hole 10d and the guide wire movement through-hole 10e, so as to facilitate the insertion and assembly of the inner tube pressing button 41 and the guide wire pressing button 42 corresponding to the inner tube movement through-hole 10d and the guide wire movement through-hole 10e.

[0059] That is, the pressing end portions 411 of both the guide wire pressing button 42 and the inner tube pressing button 41 are used for the relevant operating physician to apply pressure with fingers. The insertion rod portions 412 of the guide wire pressing button 42 and the inner tube pressing button 41 are correspondingly inserted into the guide wire movement through-hole 10e and the inner tube movement through-hole 10d, and the damping increasing end portions 413 of the guide wire pressing button 42 and the inner tube pressing button 41 are used to press the catheter guide wire 23 and the venous inner tube 22 tightly from the relative circumferential surfaces of the catheter guide wire 23 and the venous inner tube 22.

[0060] Moreover, when an external force pushes the damping increasing end portion 413 to be in damping contact with the venous inner tube 22 or the catheter guide wire 23 through the pressing end portion 411, the reset structure 4121 interferes with the guide wire movement through-hole 10e or the inner tube movement through-hole 10f. Thus, the surface of the reset structure 4121 undergoes elastic deformation and enters the inside of the guide wire movement through-hole 10e or the inner tube movement through-hole 10f; when the external force is withdrawn, the reset structure 4121 elastically recovers and thus exits from the inside of the guide wire movement through-hole 1oe or the inner tube movement through-hole 10f.

[0061] Such as Figure 6 and Figure 7As shown, the locking clip 50 is a detachable accessory, in an inverted "U" shape, having two clamping ends 51, and the distance between the two clamping ends 51 is the locking distance. Specifically, there are two locking clips 50, detachably corresponding to be arranged on the two pressing ends 411 of a pair of wire pressing buttons 42 and a pair of inner tube pressing buttons 41. Thus, the locking distance enables the venous inner tube 22 and the catheter guide wire 23 to be clamped and positioned relative to the housing 10, and the locking distance can be elastically changed and restored. In this embodiment, the middle part of the locking clip 50 also has a reinforcing part 52.

[0062] The locking clip 50 is used to correspondingly clamp the pressing ends 411 of the two wire pressing buttons 42 or the pressing ends 411 of the two inner tube pressing buttons 41 through the two clamping ends 51. Thus, the wire pressing button 42 clamps and positions the catheter guide wire 23 relative to the housing 10, that is, the catheter guide wire 23 is clamped and positioned relative to the puncture needle tube 23; thus, the inner tube pressing button 42 clamps the venous inner tube 22, that is, the venous inner tube 22 is fixed relative to the catheter guide wire 23. Specifically, an elastic embedding and fitting recess 411a and a positioning bump 51a are further formed on the clamping end 51. Thus, on the premise that the locking clip 51 makes the venous prefabricated tube 22 and the catheter guide wire 23 not move relative to the housing 10, the locking clip 51 will not fall off from the pressing end 411 under the overall vibration of the device caused by environmental reasons.

[0063] The operation process of the central venous catheter kit 100 for ultrasound-guided puncture will be described below in conjunction with embodiments:

[0064] When performing a central venous catheterization operation, the relevant operating physician holds the housing 10. First, bring the puncture opening 10c close to the body surface of the patient to be catheterized. By applying a thrust to the driving protrusion 211, the puncture needle tube 21 is moved relative to the puncture guiding channel 10a to push out of the puncture opening 10c. Then, when the puncture needle tube 21 pierces the body surface of the patient to be catheterized and penetrates into the predetermined vein, the relevant operating physician pins and fixes the puncture needle tube 21 through the pin connection ear 10g. Then, the relevant operating physician pinches the guide wire pressing button 42 with one hand, clamps the catheter guide wire 23, and moves the catheter guide wire 23 along the puncture direction D towards the puncture opening 10c. Then release the guide wire pressing button 42 so that the catheter guide wire 23 is released, and the guide wire pressing button 42 is retracted in a non-pinching manner. Through multiple cycles of pinching - moving, releasing - retracting actions, continuous wire feeding inside the predetermined vein of the patient to be catheterized is achieved, that is, the catheter guide wire 23 extends a predetermined length along the extension of the predetermined vein. Then, the catheter guide wire 23 is clamped and positioned relative to the housing 10 through the locking clip 50. Then, the relevant operating physician pinches the internal catheter pressing button 41 with one hand, clamps the venous internal catheter 22, and moves the venous internal catheter 22 along the puncture direction D towards the puncture opening 10c. Then release the internal catheter pressing button 41 so that the venous internal catheter 22 is released, and the internal catheter pressing button 41 is retracted in a non-pinching manner. Through multiple cycles of pinching - moving, releasing - retracting actions, continuous tube feeding inside the predetermined vein of the patient to be catheterized is achieved. And since the venous internal catheter 22 is sleeved on the catheter guide wire 23, the venous internal catheter 22 enters the inside of the predetermined vein, and the venous internal catheter 22 completely leaves the central venous catheter kit 100 for ultrasound-guided puncture. And the venous internal catheter 22 is manually separated from the puncture needle tube 21, and one end of the venous internal catheter 22 is fixed on the body surface of the patient to be catheterized. Then, the relevant operating physician retracts the puncture needle tube 21 back into the puncture guiding channel 10a by pushing the needle-reversing protrusion 211, and fixes the puncture needle tube 21 again through the pin connection ear 10g. Then, the relevant operating physician retracts the catheter guide wire 23 into the puncture guiding channel 10a by operating the drive crank 311 with one hand.

[0065] The above embodiments are preferred cases of the present invention and are not used to limit the protection scope of the present invention. Various deformations or modifications that can be made by those of ordinary skill in the art without creative labor within the scope of the appended claims still fall within the protection scope of this patent.

Claims

1. A central venous catheter kit for ultrasound-guided puncture, characterized in that: include: The housing has a puncture guide channel, the puncture guide channel extends in a straight line and has a puncture opening portion open to the outside, and the extension direction is used as the puncture direction; The cannula unit includes a puncture needle, an intravenous cannula, and a cannula guidewire. Wherein, the intravenous catheter has an insertion tube end section close to the puncture opening, and the catheter guide wire has an in vivo wire end section close to the puncture opening. The puncture needle tube, the insertion tube end section and the in vivo wire end section are sleeved in sequence from outside to inside, and the puncture needle tube, the insertion tube end section, the in vivo wire end section and the puncture guide channel all extend along the puncture direction. The puncture needle tube is arranged in the puncture guide channel, and the tip of the puncture needle tube is located near the puncture opening and faces the puncture opening. The puncture needle tube is movable relative to the puncture guide channel along the puncture direction, the catheter guide wire is movable relative to the puncture needle tube along the puncture direction, and the intravenous catheter is movable relative to the catheter guide wire. When performing a central venous catheterization operation, the puncture port is brought close to the body surface of the patient, and the puncture needle is moved relative to the puncture guide channel. When the body surface of the patient is pierced and the predetermined vein is inserted, the catheterization guide wire is moved relative to the puncture needle, and the catheterization guide wire enters the predetermined vein through the puncture needle. When the catheterization guide wire enters the predetermined vein along the extension direction of the predetermined vein and a predetermined length, the intravenous catheter is moved relative to the catheterization guide wire, so that the intravenous catheter is inserted into the predetermined vein along the catheterization guide wire.

2. The central venous catheter kit for ultrasound-guided puncture according to claim 1, characterized in that: in, The housing also has an accommodating inner cavity, and the puncture guide channel is communicated with the accommodating inner cavity. The shell is formed by buckling two identical half shells, and the two half shells equally divide the volume of the puncture guide channel and the accommodating inner cavity.

3. The central venous catheter kit for ultrasound-guided puncture according to claim 2, characterized in that: in, The accommodating inner cavity has a pair of guide wire moving through holes, and the puncture conducting channel has a pair of built-in tube moving through holes that penetrate each other. The guide wire moving through hole is used to apply a clamping force to the catheter guide wire from the outside, and to move the catheter guide wire relative to the puncture needle tube; the internal tube moving through hole is used to apply a clamping force to the intravenous catheter from the outside, and to move the intravenous catheter relative to the catheter guide wire.

4. The central venous catheter kit for ultrasound-guided puncture according to claim 3, characterized in that: in, The catheter guide wire enters the accommodating inner cavity straightly from the puncture guide channel.

5. The central venous catheter kit for ultrasound-guided puncture according to claim 3, characterized in that: Also includes: The wire unwinding assembly comprises a wire winding wheel, which is rotatably arranged inside the accommodating inner cavity, and the wire winding wheel also has a driving crank that passes through the shell, and the driving crank is used for rotating by fingers to drive the wire winding wheel to rotate. The catheter placement guide wire has a winding fixed end opposite to the insertion tube end section, the catheter placement guide wire is fixed to the circumference of the wire winding wheel through the winding fixed end, and part of the catheter placement guide wire is wound and arranged on the circumference of the wire winding wheel.

6. The central venous catheter kit for ultrasound-guided puncture according to claim 5, characterized in that: in, The wire unwinding assembly further comprises a steering wheel, which is rotatably disposed inside the accommodating inner cavity. The catheter placement guide wire led out by the wire winding wheel wraps around part of the circumference of the steering wheel, so that after passing through the steering wheel, the extension direction of the catheter placement guide wire changes and the guide wire straightly enters the puncture guide channel.

7. The central venous catheter kit for ultrasound-guided puncture according to claim 3, characterized in that: Also includes: The damping enhancement component includes a pair of guide wire pressing buttons and a pair of built-in tube pressing buttons. The pair of guide wire pressing buttons are respectively inserted into the pair of guide wire moving through holes, and the guide wire pressing buttons are movable along the insertion direction; the pair of built-in tube pressing buttons are respectively inserted into the pair of built-in tube moving through holes, and the built-in tube pressing buttons are movable along the insertion direction. The built-in tube pressing button has the same structure as the guide wire pressing button, and the guide wire pressing button includes an integral and continuous pressing end, an insertion rod, and a damping increasing end, the pressing end forms a flange relative to the insertion rod, and the peripheral surface of the insertion rod has a reset structure located outside the housing, The pressing ends of the guidewire pressing button and the embedded tube pressing button are both used to apply pressure with fingers, the insertion rods of the guidewire pressing button and the embedded tube pressing button are correspondingly inserted into the guidewire moving through hole and the embedded tube moving through hole, and the damping increasing ends of the guidewire pressing button and the embedded tube pressing button are used to correspondingly press the catheter guidewire and the embedded intravenous catheter from the relative circumferential surfaces of the catheter guidewire and the embedded intravenous catheter.

8. The central venous catheter kit for ultrasound-guided puncture according to claim 7, characterized in that: in, The reset structure is a conical circumferential surface along the extension direction of the insertion rod, and the large end of the reset structure is adjacent to the pressing end. When external force pushes the damping increasing end through the pressing end to contact the intravenous catheter or the catheter guide wire damping, the reset structure interferes with the guide wire moving through hole or the catheter moving through hole, so that the surface of the reset structure is elastically deformed and enters the interior of the guide wire moving through hole or the catheter moving through hole; when the external force is removed, the reset structure elastically recovers, thereby exiting from the guide wire moving through hole or the catheter moving through hole.

9. The central venous catheter kit for ultrasound-guided puncture according to claim 7 or 8, characterized in that: Also includes: The locking clamp is in an inverted "U" shape, has two clamping ends, and the distance between the two clamping ends is the locking distance. The locking clamp is used to clamp the pressing ends of the two guidewire pressing buttons or the pressing ends of the two inserted tube pressing buttons through the two clamping ends, so that the guidewire pressing button clamps the inserted tube guidewire, that is, the inserted tube guidewire is fixed relative to the puncture needle tube; so that the inserted tube pressing button clamps the intravenous catheter, that is, the intravenous catheter is fixed relative to the catheter guidewire.

10. The central venous catheter kit for ultrasound-guided puncture according to claim 1, characterized in that: in, The housing also has a needle driving waist groove extending along the puncture direction, and the two opposite sides of the needle driving waist groove have pin connection ears. A needle driving protrusion is also formed on the circumferential surface of the puncture needle tube, and the driving protrusion cooperates and passes through the driving waist groove. When the driving protrusion moves relative to the puncture guide channel, the puncture needle tube extends out or retracts into the interior of the puncture guide channel, and the pin connection ear is used to fix the puncture needle tube relative to the shell by pinning the needle driving protrusion.

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