Disposable Peripheral Access Medium Length Catheter

Abstract

The invention relates to a disposable medium-length catheter for peripheral puncture. Compared with a traditional indwelling needle, the medium-length catheter is a soft catheter that can be inserted into a blood vessel to a longer length and will not puncture or damage the blood vessel. Therefore, the catheter has a longer service life and is safer. The medium-length catheter is provided with a main sleeve and a combined sleeve that are connected to each other. The catheter is slidably connected in the main sleeve, the puncture needle is fixed to the lower end of the inner sleeve of the combined sleeve and extends into the catheter, and the guide wire is connected to the outer sleeve of the sleeve assembly through a traction sleeve and extends into the puncture needle. Therefore, the guide wire, the puncture needle and the catheter are combined into a whole, and one person can continuously complete the operation of inserting the catheter. Therefore, the invention is easy to operate and use, improves the efficiency of inserting the catheter and reduces the burden on doctors.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, and in particular to a disposable peripheral puncture medium-length catheter. Background Art

[0002] Indwelling needles are often used in clinical practice. Indwelling needles can be left in place for a long time to reduce the patient's vascular damage and mental pain caused by repeated punctures, and reduce the nursing staff's workload in venipuncture. Since the indwelling needle is made of hard material and inserted into the patient's blood vessel, it cannot be inserted too long to avoid puncturing the blood vessel. Therefore, the material of the indwelling needle and the length of insertion into the blood vessel determine its short use time, usually only 1-3 days. There are currently no indwelling needles suitable for medium to long-term use on the market. Therefore, it is necessary to design a medium-length catheter to replace the indwelling needle to solve this problem.

[0003] At present, the steps for doctors to insert a catheter during surgery are: first insert a puncture needle, then slowly insert a guide wire along the puncture needle, pull out the puncture needle, and finally insert the catheter into the patient's body along the guide wire. After the catheter is properly fixed, the guide wire is pulled out to complete the operation. The puncture needle, guide wire, and catheter tube used for the above-mentioned catheter insertion are usually placed in a tool box. When in use, according to the doctor's needs, the nurse delivers the puncture needle, guide wire, and catheter tube to the doctor one by one. This method of catheter insertion requires the doctor and the nurse to cooperate to perform the operation one by one. Therefore, the process of catheter insertion is complicated and cumbersome, which will consume a lot of doctor's energy. In order to solve the above problems, it is necessary to design an integrated catheter insertion component that is easy to operate and use. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a disposable peripheral puncture medium-length catheter.

[0005] The technical solution of the present invention is: a disposable medium-length catheter for peripheral puncture, characterized in that: the medium-length catheter comprises a cylindrical main sleeve, a combined sleeve, a guide wire assembly, a puncture needle, and a catheter assembly;

[0006] A square notch A is provided on the side wall of the main sleeve along the axis, one end of the square notch A is close to the upper end face of the main sleeve, and the other end passes through the lower end face of the main sleeve. The catheter assembly is installed in the main sleeve, including a tapered joint, a transparent catheter concentrically fixedly connected to the tapered joint, a cylindrical portion is concentrically provided at the upper end of the tapered joint, and the cylindrical portion is slidably connected to the main sleeve to form a sliding pair, and a push-pull block located between the square notches A is provided in the middle of the outer side wall of the tapered joint; a tearable catheter sheath is sheathed at the lower end of the main sleeve, and the transparent catheter concentrically passes through the tearable catheter sheath;

[0007] The combined sleeve comprises a cylindrical inner sleeve and an outer sleeve sleeved on the inner sleeve. A square notch B is provided on the inner sleeve along the axis line, which passes through the upper and lower end surfaces and corresponds to the square notch A. A positioning hole is provided at the lower end of the side wall of the inner sleeve on the side corresponding to the square notch B. A positioning spring piece A is provided at the upper end, and a square limiting boss A is provided on the outer side surface. A slope is provided at the upper end of the limiting boss A. A stepped axial connector with a through hole is concentrically provided on the lower end surface of the inner sleeve. The connector is sleeved in the upper port of the main sleeve and is interference-fitted with the connector to connect the combined sleeve and the main sleeve. The upper end of the puncture needle is fixed in the through hole of the connector, and the lower end extends into the main sleeve and passes through the tapered joint into the transparent catheter. When the tapered joint is located at the uppermost end in the main sleeve, the needle tip of the puncture needle extends out of the transparent catheter.

[0008] A square notch C is provided on the side wall of the outer sleeve along the axis, the position of which coincides with the square notch B and the size of which matches the square notch B. One end of the square notch C passes through the lower end face of the outer sleeve, and the other end is close to the upper end face of the outer sleeve. A square notch D is provided in the middle of the side wall of the outer sleeve on the side corresponding to the square notch C. The above-mentioned limiting boss A is located in the square notch. A stopper is provided on the upper part of the square notch D. A positioning spring piece B is provided on the outer sleeve at the lower part of the square notch D. A positioning block matching the above-mentioned positioning hole is provided on the inner side face of the positioning spring piece B, and a limiting boss B is provided on the outer side face;

[0009] The guide wire assembly includes a cylindrical traction sleeve which is sleeved on the outer sleeve and a guide wire. A limit slider is provided on the inner wall of the traction sleeve radially inward. The limit slider is located in the square notch C to form a sliding pair. A guide wire connecting column concentric with the traction sleeve is provided on the end face of the limit slider. The upper end of the guide wire is fixed in the guide wire connecting column, and the lower end is downwardly inserted into the puncture needle below. An elastic push-pull handle is provided on the outer side face of the traction sleeve, and a positioning hook which can be hooked into the square notch A at the upper end of the main sleeve is provided on the inner side face of the lower end of the push-pull handle.

[0010] Preferably, a positioning convex strip is provided on the outer side wall of the stepped axial connector along the axis, and a groove is provided on the upper end of the inner side wall of the main sleeve along the axis, and the positioning convex strip is matched and snapped into the groove.

[0011] Preferably, the circular tube body in the middle of the tearable catheter sheath extends upward, and the extended part is matched and inserted into the main tube body. The upper end face of the circular tube body is provided with a narrow notch downward, and the upper end face of the corresponding side of the slit is provided with a wide notch downward. Two symmetrical elastic baffles are provided outward on both sides of the wide notch, and the two elastic baffles are pressed tightly on the main sleeve on both sides of the square notch A.

[0012] Preferably, an inverted figure-eight opening is provided on the square notch A at the lower port of the main sleeve.

[0013] Preferably, a conical guide groove is coaxially provided inwardly on the upper end surface of the stepped axial connector.

[0014] Preferably, a non-slip gripping block is provided at the lower end of the outer side wall of the main sleeve.

[0015] Preferably, a sliding plane is provided on the outer side wall of the main sleeve between the square notch A and the upper end surface of the main sleeve.

[0016] Preferably, a circular sealing sheet made of elastic material is provided in the conical joint, and a through slit is provided in the middle of the sealing gasket.

[0017] Preferably, a chamfer is provided at the lower end of the transparent catheter.

[0018] The beneficial technical effects of the present invention are:

[0019] The present invention designs a medium-length catheter for peripheral puncture. Compared with a traditional indwelling needle, the soft catheter can be inserted into a blood vessel to a longer length without puncturing or damaging the blood vessel. Therefore, the catheter has a longer service life and higher safety.

[0020] The present invention is provided with a main sleeve and a combined sleeve that are connected to each other, the catheter is slidably connected in the main sleeve, the puncture needle is fixed to the lower end of the inner sleeve of the combined sleeve and extends into the catheter, the guide wire is connected to the outer sleeve of the sleeve assembly through a traction sliding sleeve and extends into the puncture needle, so the guide wire, the puncture needle and the catheter are combined into a whole, and one person can continuously complete the operation of inserting the catheter. The present invention is easy to operate and use, improves the efficiency of inserting the catheter, and reduces the surgical burden of the doctor.

[0021] The present invention achieves guidewire insertion by moving the outer sleeve downward along the inner sleeve and sliding downward to pull the sliding sleeve. This design reduces the overall length of the product while ensuring the delivery length of the guidewire. The catheter is inserted by sliding the tapered connector downward in the main sleeve, thereby improving the stability of catheter insertion. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional structural schematic diagram of the present invention;

[0023] Figure 2 It is one of the three-dimensional structural schematic diagrams of the combined sleeve of the present invention;

[0024] Figure 3 This is the second schematic diagram of the three-dimensional structure of the combined sleeve of the present invention;

[0025] Figure 4 It is a schematic diagram of the three-dimensional structure of the inner sleeve of the present invention;

[0026] Figure 5 It is a three-dimensional structural schematic diagram of the main sleeve and the tearable catheter sheath being separated, and the guide wire and the puncture needle being pulled out of the catheter;

[0027] Figure 6 is a schematic diagram of the three-dimensional structure of the catheter assembly of the present invention;

[0028] Figure 7 It is a schematic diagram of the three-dimensional structure of the tearable catheter sheath of the present invention;

[0029] Figure 8 It is a schematic diagram of the three-dimensional structure of the guidewire assembly of the present invention;

[0030] Fig. 9 Schematic diagram of the three-dimensional structure of the sealing sheet;

[0031] Fig.10 It is a cross-sectional structural schematic diagram of the initial state of the present invention;

[0032] Fig.11 yes Fig.10 A partial enlarged view of

[0033] Fig.12 is a schematic diagram of the cross-sectional structure after the guide wire is delivered according to the present invention;

[0034] Fig.13 yes Fig.12 A magnified image of point A;

[0035] Fig.14 yes Fig.12 The enlarged view of point B;

[0036] Fig.15 is a schematic diagram of the cross-sectional structure of the delivery catheter of the present invention;

[0037] Fig.16 yes Fig.15 A partial enlarged view of

[0038] Fig.17 It is a schematic diagram of the structure after the transparent catheter is connected to the extension tube and the locking assembly.

[0039] 01 Main sleeve, 11. Square notch A, 12. Anti-slip gripping block, 13. Sliding plane, 14. Inverted eight-shaped opening, 21. Traction sliding sleeve, 211. Limiting slider, 212. Guide wire connecting column, 213. Push-pull handle, 214. Positioning hook, 22. Guide wire, 03. Combined sleeve, 31. Outer sleeve, 311. Square notch C, 312. Square notch D, 313. Block, 314. Positioning spring piece B, 315. Positioning block, 316. Limiting boss B, 32. Inner sleeve, 321. Positioning hole, 322. Positioning spring piece A , 323. limiting boss A, 324. slope, 325. connector, 326. positioning convex strip, 327. tapered guide groove, 328. square notch B, 04. puncture needle, 05. catheter assembly, 51. tapered joint, 52. cylinder, 53. push-pull block, 54. transparent catheter, 55. chamfer, 06. tearable catheter sheath, 61. round tube, 62. narrow notch, 63. elastic baffle, 81. sealing sheet, 82. slit, 91. extension tube, 92. locking assembly. DETAILED DESCRIPTION

[0040] Embodiment 1, referring to the attached drawings (1 - 17) of the specification, a disposable medium-length catheter for peripheral puncture, characterized in that: the medium-length catheter comprises a cylindrical main sleeve, a combined sleeve, a guide wire assembly, a puncture needle, and a catheter assembly; a square notch A is opened along the axis of the side wall of the main sleeve, one end of the square notch A is close to the upper end face of the main sleeve, and the other end passes through the lower end face of the main sleeve; the catheter assembly is installed in the main sleeve, and comprises a tapered joint, a transparent catheter concentrically fixedly connected to the tapered joint, a cylindrical portion is concentrically provided at the upper end of the tapered joint, and the cylindrical portion is slidably connected to the main sleeve to form a sliding pair, and a push-pull portion is provided in the middle of the outer wall of the tapered joint between the square notch A. The catheter can be pushed downward by pushing the push-pull block with a finger; a tearable catheter sheath is sleeved on the lower port of the main sleeve, and a transparent catheter is concentrically passed through the tearable catheter sheath, and the catheter sheath guides the catheter and fixes the conical joint; an extension tube is connected to the conical joint, and a locking assembly is provided on the extension tube; a circular sealing sheet made of elastic material is provided in the conical joint, and a through slit is provided in the middle of the sealing gasket, and the puncture needle passes through the slit, so that blood backflow from the conical connector is avoided during puncture; an anti-slip gripping block is provided at the lower end of the outer wall of the main sleeve, which improves the grip feel and avoids slipping during gripping.

[0041] The combined sleeve comprises a cylindrical inner sleeve and an outer sleeve sleeved on the inner sleeve. A square notch B is provided on the inner sleeve along the axis line, which passes through the upper and lower end surfaces and corresponds to the above-mentioned square notch A. A positioning hole is provided at the lower end of the side wall of the inner sleeve on the side corresponding to the square notch B. A positioning spring piece A is provided at the upper end, and a limiting boss A is provided on the outer side surface. A slope is provided at the upper end of the limiting boss A. A stepped axial connector with a through hole inside is concentrically provided on the lower end surface of the inner sleeve. The connector is sleeved in the upper port of the main sleeve and is interference-fitted with it to connect the combined sleeve and the main sleeve. The upper end of the puncture needle is fixed in the through hole of the connector, and the lower end extends into the main sleeve and passes through the tapered joint into the transparent catheter. When the tapered joint is located at the uppermost end in the main sleeve, the needle tip of the puncture needle extends out of the transparent catheter.

[0042] A square notch C is provided on the side wall of the outer sleeve along the axis, the position of which coincides with the square notch B and the size of which matches the square notch B. One end of the square notch C passes through the lower end face of the outer sleeve, and the other end is close to the upper end face of the outer sleeve. A square notch D is provided in the middle of the side wall of the outer sleeve on the side corresponding to the square notch C. The above-mentioned limiting boss A is located in the square notch, and a stopper is provided on the upper part of the square notch D. A positioning spring piece B is provided on the outer sleeve at the lower part of the square notch D. A positioning block matching the above-mentioned positioning hole is provided on the inner side surface of the positioning spring piece, and a limiting boss B is provided on the outer side surface; when the outer sleeve moves downward along the inner sleeve to its lower end, the positioning block moves downward and is inserted into the positioning hole, and the limiting boss A on the outer side surface of the positioning spring piece A will pass over the stopper through the slope at its upper end, thereby playing a limiting role and preventing the two sleeves from slipping off.

[0043] The guide wire assembly includes a cylindrical traction sleeve and a guide wire which are sleeved on the outer sleeve. A limit slider is provided on the inner side wall of the traction sleeve radially inward. When the traction sleeve slides downward on the outer sleeve, the limit slider can prevent it from rotating left and right to ensure stable operation. The limit slider is located in the square notch C to form a sliding pair. A guide wire connecting column concentric with the traction sleeve is provided on the end face of the limit slider. The upper end of the guide wire is fixed in the guide wire connecting column, and the lower end is inserted downward into the puncture needle below. An elastic push-pull handle is provided on the outer side face of the traction sleeve A positioning hook is provided on the inner side surface of the lower end of the push-pull handle, which can be hooked into the square notch armor at the upper end of the main sleeve. The positioning hook is used to hook into the upper end of the rectangular notch to ensure that the guide wire is in a fixed state after being inserted into the patient's body. A positioning convex strip is provided on the outer wall of the stepped axial connector along the axis, and a groove is provided on the upper end of the inner wall of the main sleeve along the axis. The positioning convex strip is matched and snapped into the groove. A sliding plane is provided on the outer wall of the sleeve between the square notch armor and the upper end face of the main sleeve. The sliding plane makes it easier for the positioning hook to slide into the square notch armor.

[0044] The circular tube body in the middle of the tearable catheter sheath extends upward, and the extended part is matched and inserted into the main body. The upper end face of the circular tube body is provided with a narrow notch downward, and the upper end face of the corresponding side of the slit opens a wide notch downward, so that the upper port of the circular tube body can be elastically deformed when subjected to pressure, and two symmetrical elastic baffles are provided outwardly on both sides of the wide notch, and the two elastic baffles are pressed tightly on the main sleeve on both sides of the square notch A. The two elastic baffles are supported on the square notch to ensure the tight connection of the tearable catheter sheath, and an inverted eight-shaped opening is provided on the square notch A at the lower port of the main sleeve, and the inverted eight-shaped opening is used to block the elastic baffle, thereby preventing the tearable sheath from loosening and slipping.

[0045] The upper end surface of the stepped axial connector is concentrically provided with a tapered guide groove inwardly, which facilitates the guide wire to enter the puncture needle during assembly; the lower end of the transparent catheter is provided with a chamfer, which forms a puncture slope with the puncture needle, so the catheter will not affect normal puncture.

[0046] The method of using the present invention is:

[0047] puncture

[0048] Slide the tapered joint upward to make the needle tip of the puncture needle extend out of the lower port of the transparent catheter, slide the outer sleeve and the traction sleeve upward to retract the lower end of the guide wire into the puncture needle, hold the lower end of the main sleeve with one hand and insert the puncture needle together with the lower end of the main catheter into the puncture point.

[0049] Delivery Guidewire

[0050] After the lower end of the transparent catheter and the puncture needle enter the blood vessel from the puncture point and the blood returning in the transparent catheter can be seen, use the other hand to slide the traction sleeve downward to deliver the guide wire. When the lower end surface of the traction sleeve contacts the limiting boss B on the outer surface of the positioning spring piece B, the outer sleeve will be driven to slide downward on the inner sleeve to continue to deliver the guide wire. When the outer sleeve slides to the lower end of the inner sleeve, the positioning block on the inner surface of the positioning spring piece B will be inserted into the positioning hole for positioning. The limiting boss A on the outer surface of the positioning spring piece A will pass over the block through the slope at its upper end to play a limiting role to prevent the two sleeves from slipping off. At the same time, the positioning hook on the traction sleeve will be hooked tightly into the square notch A on the main sleeve to fix the traction sleeve, thereby completing the delivery and fixation of the guide wire.

[0051] Delivery catheter

[0052] After the guidewire is delivered, use your other hand to push the tapered hub down until it snaps into the tearable catheter sheath. The catheter then follows the guidewire into the blood vessel, completing the delivery of the catheter.

[0053] Separate the puncture needle and guide wire

[0054] After the catheter is delivered, pinch the tearable catheter sheath with one hand and pinch the lower end of the main catheter with the other hand and pull upward to separate the main catheter and the tearable catheter sheath, then pull out the puncture needle and guide wire. At this time, only the catheter assembly remains in the blood vessel.

[0055] Connect the extension tube and fix the catheter assembly

[0056] Fix the joint of the extension tube and the conical joint of the catheter assembly, connect the outer end of the extension tube to the closed infusion joint, close the clip on the extension joint, then fasten the locking assembly to the conical joint of the catheter assembly and stick it to the skin, and stick the locking assembly with a transparent film.

Claims

1. A disposable peripheral puncture medium-length catheter, characterized in that: The medium-length catheter comprises a cylindrical main sleeve, a combined sleeve, a guide wire assembly, a puncture needle, and a catheter assembly; A square notch A is provided on the side wall of the main sleeve along the axis, one end of the square notch A is close to the upper end face of the main sleeve, and the other end passes through the lower end face of the main sleeve. The catheter assembly is installed in the main sleeve, including a tapered joint, a transparent catheter concentrically fixedly connected to the tapered joint, a cylindrical portion is concentrically provided at the upper end of the tapered joint, and the cylindrical portion is slidably connected to the main sleeve to form a sliding pair, and a push-pull block located between the square notches A is provided in the middle of the outer side wall of the tapered joint; a tearable catheter sheath is sheathed at the lower end of the main sleeve, and the transparent catheter concentrically passes through the tearable catheter sheath; The combined sleeve comprises a cylindrical inner sleeve and an outer sleeve sleeved on the inner sleeve. A square notch B is provided on the inner sleeve along the axis line, which passes through the upper and lower end surfaces and corresponds to the square notch A. A positioning hole is provided at the lower end of the side wall of the inner sleeve on the side corresponding to the square notch B. A positioning spring piece A is provided at the upper end, and a square limiting boss A is provided on the outer side surface. A slope is provided at the upper end of the limiting boss A. A stepped axial connector with a through hole is concentrically provided on the lower end surface of the inner sleeve. The connector is sleeved in the upper port of the main sleeve and is interference-fitted with the connector to connect the combined sleeve and the main sleeve. The upper end of the puncture needle is fixed in the through hole of the connector, and the lower end extends into the main sleeve and passes through the tapered joint into the transparent catheter. When the tapered joint is located at the uppermost end in the main sleeve, the needle tip of the puncture needle extends out of the transparent catheter. A square notch C is provided on the side wall of the outer sleeve along the axis, the position of which coincides with the square notch B and the size of which matches the square notch B. One end of the square notch C passes through the lower end face of the outer sleeve, and the other end is close to the upper end face of the outer sleeve. A square notch D is provided in the middle of the side wall of the outer sleeve on the side corresponding to the square notch C. The above-mentioned limiting boss A is located in the square notch. A stopper is provided on the upper part of the square notch D. A positioning spring piece B is provided on the outer sleeve at the lower part of the square notch D. A positioning block matching the above-mentioned positioning hole is provided on the inner side face of the positioning spring piece B, and a limiting boss B is provided on the outer side face; The guide wire assembly comprises a cylindrical traction sleeve sleeved on the outer sleeve and a guide wire, a limit slider is provided on the inner side wall of the traction sleeve radially inwardly, the limit slider is located in the square notch C to form a sliding pair, a guide wire connecting column concentric with the traction sleeve is provided on the end face of the limit slider, the upper end of the guide wire is fixed in the guide wire connecting column, and the lower end is inserted downward into the puncture needle below, an elastic push-pull handle is provided on the outer side face of the traction sleeve, and a positioning hook that can be hooked into the square notch A at the upper end of the main sleeve is provided on the inner side face of the lower end of the push-pull handle; The outer side wall of the stepped shaft-shaped connector is provided with a positioning convex strip along the axis, and the upper end of the inner side wall of the main sleeve is provided with a groove along the axis, and the positioning convex strip is matched and inserted into the groove; The circular tube body in the middle of the tearable catheter sheath extends upward, and the extended part is matched and inserted into the main tube body. A narrow notch is provided downward on the upper end face of the circular tube body, and a wide notch is provided downward on the upper end face of the corresponding side of the slit. Two symmetrical elastic baffles are provided outward on both sides of the wide notch, and the two elastic baffles are pressed tightly on the main sleeve on both sides of the square notch A.

2. A disposable peripheral puncture medium-length catheter according to claim 1, characterized in that: An inverted eight-shaped opening is arranged on the square notch A at the lower end of the main sleeve.

3. A disposable peripheral puncture medium-length catheter according to claim 1, characterized in that: The upper end surface of the stepped shaft-shaped connector is coaxially provided with a tapered guide groove inwardly.

4. A disposable peripheral puncture medium-length catheter according to claim 1, characterized in that: An anti-slip gripping block is provided at the lower end of the outer side wall of the main sleeve.

5. A disposable peripheral puncture medium-length catheter according to claim 1, characterized in that: A sliding plane is arranged on the outer side wall of the main sleeve between the square notch A and the upper end surface of the main sleeve.

6. A disposable peripheral puncture medium-length catheter according to claim 1, characterized in that: A circular sealing sheet made of elastic material is arranged in the conical joint, and a through slit is arranged in the middle of the sealing pad.

7. A disposable peripheral puncture medium-length catheter according to claim 1, characterized in that: The lower end of the transparent catheter is provided with a chamfer.

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