Bullet sheath

Abstract

The invention relates to a bullet sheath. The bullet sheath comprises a sheath tube body, a sheath tube clamp and an inner expansion tube made of an elastic material, the inner expansion tube penetrates through the interior of the sheath tube body; the front end and the rear end of the inner expansion tube respectively exceed the front end and the rear end of the sheath tube body; the inner diameter of the inner expansion tube is matched with the outer diameter of the guide wire; the main body of the sheath tube clamp is tubular; the rear end of the sheath tube body is inserted into the front end of the sheath tube clamp; the rear end of the inner expansion tube is fixedly inserted into the rear end of the sheath clamp; a conical head A is arranged at the front end of the inner expansion tube; a flaring section is arranged at the part of the front end of the inner expansion tube beyond the front end of the sheath tube clamp; the outer diameter of the flaring section is larger than the inner diameter of the front end orifice of the sheath body; the two ends of the flaring section are in smooth transition connection with the inner expansion pipe. The inner expansion pipe is additionally arranged; the inner expansion tube smoothly enters a wound left by a puncture needle through the conical head A matched with the guide wire, and the wound is expanded outwards through the flaring section, so that the sheath tube body smoothly passes through the wound; the externally expanded wound is matched with the sheath tube body, so that the probability of external infection is effectively reduced.

Description

Technical Field

[0001] The invention relates to the technical field of medical instruments, in particular to a bullet sheath. Background Art

[0002] The catheter sheath is a common medical device for establishing a catheter channel, and is mostly used to guide the catheter into the blood vessel smoothly during vascular intervention surgery. The existing catheter sheath insertion process includes the following steps: ① Use a puncture needle to puncture the puncture point; ② Use a guide wire to penetrate from the tail of the puncture needle and penetrate into the body to an appropriate depth; ③ Hold the guide wire tightly and pull out the puncture needle along the guide wire; ④ Perform local anesthesia on the puncture point to prepare for the subsequent wound dilation operation; ⑤ Use a dilation scalpel to dilate the wound left by the puncture with the guide wire as the center; ⑥ Insert the catheter sheath from the tail of the guide wire and push it into the body to an appropriate depth; when inserting the catheter sheath, slightly rotate the catheter sheath to ensure that the catheter sheath enters the subcutaneous tissue smoothly and the side tube of the catheter sheath exposed outside the body is facing the surgical direction; ⑦ Pull out the guide wire. During actual operation, the relationship between the outer diameter of the puncture needle, the guide wire diameter, and the outer diameter of the sheath tube of the catheter sheath is: the outer diameter of the sheath tube of the catheter sheath > the outer diameter of the puncture needle > the guide wire diameter; and the epidermal tissue at the wound has great toughness, so when the catheter sheath is inserted, the wound left by pulling out the puncture needle is not conducive to the entry of the sheath tube of the catheter sheath, and a scalpel is needed to expand and cut the wound; this leads to the following shortcomings in the existing catheter sheath insertion process: 1) The wound enlarged by the scalpel is often larger than the outer diameter of the sheath tube of the catheter sheath, increasing the chance of external infection; 2) The skin expansion scalpel may accidentally injure other blood vessels in the human body, causing unnecessary bleeding and affecting the efficiency of catheterization; 3) The skin expansion scalpel may accidentally cut lymph nodes, resulting in exudate, increasing maintenance costs, and increasing the chance of external infection. Summary of the invention

[0003] The purpose of the present invention is to solve the above problems and provide a bullet sheath.

[0004] The technical scheme of the present invention is as follows: a bullet sheath comprises a sheath tube body, a sheath tube clamp and an inner expansion tube made of elastic material; the inner expansion tube passes through the inside of the sheath tube body; the front end and the rear end of the inner expansion tube respectively exceed the front end and the rear end of the sheath tube body; the inner diameter of the inner expansion tube matches the outer diameter of the guide wire; the inner expansion tube is used to guide the sheath tube body into the blood vessel; after the puncture needle is pulled out, the inner expansion tube can enter the blood vessel along the guide wire to prepare for the sheath tube body to enter the blood vessel; thereafter, the sheath tube body enters the blood vessel along with the inner expansion tube; the main body of the sheath tube clamp is tubular; the rear end of the sheath tube body is inserted into the front end of the sheath tube clamp; the sheath tube clamp provides a stable operating end for the bullet sheath; the rear end of the inner expansion tube is fixedly inserted into the rear end of the sheath tube clamp, so that the inner expansion tube can move forward with the sheath tube body, and can also be pulled backward relative to the sheath tube body; the initial wound is formed at the puncture point when the puncture needle punctures; a cone is provided at the front end of the inner expansion tube shaped head armor, so that the inner dilator tube can pass through the initial wound smoothly; the part of the front end of the inner dilator tube that exceeds the front end of the sheath clamp is provided with a flared section; the outer diameter of the flared section is greater than the inner diameter of the front end of the sheath tube body; the flared section can expand the initial wound outward when passing through the initial wound, so as to facilitate the entry of the sheath tube body; the two ends of the flared section are smoothly connected to the inner dilator tube, so that the flared section can pass through the initial wound smoothly; when the sheath tube body enters the human body, the outward-expanded wound will hold the sheath tube body tightly to form a final wound, which on the one hand increases the resistance required for the sheath tube body to be dislodged, and on the other hand minimizes the size of the final wound and reduces the chance of external infection, which has great clinical significance; finally, the inner dilator tube is pulled out along the sheath tube body, the front end of the sheath tube body is placed into the human body, and the rear end of the sheath tube body is exposed outside the human body; the corresponding catheter is inserted along the sheath tube body; when the catheter enters the human body to a suitable depth, the sheath tube body is pulled out from the rear end of the catheter.

[0005] Preferably, the expansion section is arranged adjacent to the conical head armor, so that as soon as the conical head armor enters the human body, the expansion section expands the initial wound outward to prevent the wound from directly hugging the inner expansion tube and affecting the smooth entry of the sheath tube into the wound.

[0006] Preferably, the middle part of the sheath clamp has two operating wings extending radially outward; the two operating wings are symmetrically arranged about the sheath clamp; when operating, the rear end of the sheath clamp can be grasped by hand, basically into a fist shape; the fist-shaped hand can not only increase the friction with the rear end of the sheath clamp, but also act on the sheath body through the operating wings, so that the sheath body enters the blood vessel along with the inner dilation tube.

[0007] Increase the convenience of stripping the sheath body. Increase the convenience of stripping the sheath body. Further, the sheath clamp includes a tubular sheath clamp seat and a fixed tube; the rear end of the sheath body is fixedly connected to the front end of the sheath clamp seat; the sheath clamp seat is provided with an axially penetrating fan-shaped notch; the inner end of the fan-shaped notch penetrates the tube wall of the sheath clamp seat; after the inner expansion tube is pulled out and the catheter is introduced through the sheath body, the sheath clamp seat can be divided into left and right halves along the fan-shaped notch, tearing the sheath body and leaving the catheter; the operating wing plate is staggered with the fan-shaped notch; the operating wing plate is arranged on the sheath clamp seat; the rear end of the sheath clamp seat is threadedly connected to the front end of the fixed tube, so that the sheath body, the sheath clamp seat and the fixed tube are ensured to be a whole when the sheath body is pushed forward, which is convenient for the operation of the sheath body.

[0008] Furthermore, the operating fin plate is arranged to be tilted backward relative to the sheath tube clamp, thereby increasing the convenience of stripping the sheath tube body.

[0009] Furthermore, the rear side of the operating fin plate is evenly distributed with friction ridges, which increases the convenience of stripping the sheath tube body.

[0010] Furthermore, a forward-extending limit block is provided at the outer end of the operating fin plate to improve the convenience of the glass sheath tube body.

[0011] Furthermore, an insertion cone tube and an internal threaded tube coaxial with the fixed tube extend forward from the middle part of the fixed tube; the internal threaded tube is arranged outside the insertion cone tube and cooperates with the thread of the outer wall at the rear end of the sheath tube clamp seat; the front end of the insertion cone tube exceeds the front end of the fixed tube; the rear end of the sheath tube clamp seat is provided with an insertion cone cavity coaxial with the sheath tube clamp seat; the insertion cone tube is matched and inserted into the insertion cone cavity, which can ensure that the inner expansion tube is concentrically arranged with the sheath tube body; the inner hole of the insertion cone tube is fixedly connected to the outer wall of the inner expansion tube; when the inner expansion tube is pulled out, the inner expansion tube can be directly pulled out through the fixed tube.

[0012] Furthermore, a bell-mouth structure with a narrow mouth in advance is provided in the middle of the fixed tube; a bonding gap is left between the narrow mouth of the bell-mouth structure and the outer wall of the inner expansion tube; the inner expansion tube and the narrow mouth of the bell-mouth structure are bonded and connected; the narrow mouth of the bell-mouth structure is facing downward; at this time, the bell-mouth structure can guide the glue used for bonding, so that the glue gathers in the bonding gap, thereby ensuring a stable connection between the inner expansion tube and the fixed tube.

[0013] Furthermore, the outer wall of the internally threaded tube is evenly distributed with friction ridges to facilitate the operation of rotating the internally threaded tube.

[0014] Preferably, a conical head B is provided at the front end of the sheath body to facilitate the sheath body to pass through the wound smoothly.

[0015] The beneficial effects of the present invention are as follows: the bullet sheath of the present invention has the following advantages:

[0016] (1) The inner expansion tube of the present invention smoothly enters the wound left by the puncture needle through the conical head armor matching the guide wire, and expands the wound outward through the expansion section so that the sheath tube body can smoothly pass through the wound; the wound after expansion matches the sheath tube body, effectively reducing the chance of external infection; this can reduce the operation of local anesthesia and scalpel expansion, avoid accidental injury of other blood vessels and lymph nodes of the human body by the scalpel, ensure the efficiency of catheterization, and reduce maintenance costs and the chance of postoperative external infection;

[0017] (2) The expansion section of the present invention is arranged adjacent to the conical head armor, so that as soon as the conical head armor enters the human body, the expansion section expands the initial wound outward to prevent the wound from directly hugging the inner dilation tube and affecting the smooth entry of the sheath tube into the wound. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a perspective view of the bullet sheath of the present invention;

[0019] Figure 2 yes Figure 1 Axial cross-sectional view of

[0020] Figure 3 yes Figure 2 I magnified view of;

[0021] Figure 4 It is a three-dimensional sheath clamp. Figure 1 ;

[0022] Figure 5 It is a three-dimensional sheath clamp. Figure 2 ;

[0023] Figure 6 It is a real photo of the bullet sheath of the present invention;

[0024] In the figure: 1. sheath tube body, 11. conical head B, 2. sheath tube clamp, 21. operating fin plate, 211. friction ridge, 212. limit block, 22. sheath tube clamp seat, 2211. large notch, 2212. small notch, 2213. tearing rib, 222. insert cone cavity, 23. fixing tube, 231. insert cone tube, 232. internal threaded tube, 2321. friction ridge B, 233. flare structure, 234. cementing gap, 3. internal expansion tube, 31. conical head, 32. flaring section. DETAILED DESCRIPTION

[0025] Example 1: See Figure 1-5A bullet sheath comprises a sheath tube body 1, a sheath tube clamp 2 and an inner expansion tube 3 made of elastic material; the inner expansion tube 3 passes through the inside of the sheath tube body 1; the front end and the rear end of the inner expansion tube 3 respectively exceed the front end and the rear end of the sheath tube body 1; the inner diameter of the inner expansion tube 3 matches the outer diameter of the guide wire; the inner expansion tube 3 is used to guide the sheath tube body 1 into the blood vessel; after the puncture needle is pulled out, the inner expansion tube 3 can enter the blood vessel along the guide wire to prepare for the sheath tube body 1 to enter the blood vessel; thereafter, the sheath tube body 1 enters the blood vessel along with the inner expansion tube 3; the main body of the sheath tube clamp 2 is Tubular; the rear end of the sheath tube body 1 is inserted into the front end of the sheath tube clamp 2; the sheath tube clamp 2 provides a stable operating end for the bullet sheath; the rear end of the inner expansion tube 3 is fixedly inserted into the rear end of the sheath tube clamp 2, so that the inner expansion tube 3 can move forward together with the sheath tube body 1, and can also be withdrawn backward relative to the sheath tube body 1; when the puncture needle punctures, an initial wound is formed at the puncture point; the front end of the inner expansion tube 3 is provided with a conical head armor 31, so that the inner expansion tube 3 can pass through the initial wound smoothly; the front end of the inner expansion tube 3 is provided with a flared section 32 at the part beyond the front end of the sheath tube clamp 2; the outer diameter of the flared section 32 is greater than the inner diameter of the front end of the sheath tube body 1; see Figure 3 In this embodiment, the inner diameter of the front end tube opening of the sheath tube body 1 is equivalent to the outer diameter of the other sections of the inner expansion tube 3 except the expansion section 32, both of which are d1; the outer diameter of the expansion section 32 is d2; d2>d1; the expansion section 32 can expand the initial wound outward when passing through the initial wound, so as to facilitate the entry of the sheath tube body 1; the two ends of the expansion section 32 are smoothly connected with the inner expansion tube 3, so as to facilitate the expansion section 32 to pass through the initial wound smoothly; when the sheath tube body 1 enters the human body, the outward expansion wound will hold the sheath tube body 1 tightly to form a final wound, on the one hand, it will increase the resistance required for the sheath tube body 1 to dislodge, on the other hand, it will minimize the size of the final wound and reduce the probability of external infection, which has great clinical significance; finally, the inner expansion tube 3 is pulled out along the sheath tube body 1, the front end of the sheath tube body 1 is placed inside the human body, and the rear end of the sheath tube body 1 is exposed outside the human body; the corresponding catheter is inserted along the sheath tube body 1; when the catheter enters the human body to a suitable depth, the sheath tube body 1 is pulled out from the rear end of the catheter.

[0026] Compared with the prior art, the present invention adds an inner expansion tube 3; the inner expansion tube 3 smoothly enters the wound left by the puncture needle through the conical head 31 that matches the guide wire, and expands the wound outward through the expansion section 32, so that the sheath tube body 1 can smoothly pass through the wound; the wound after expansion matches the sheath tube body 1, effectively reducing the chance of external infection; this can reduce the operation of local anesthesia and scalpel expansion, avoid accidental injury of other blood vessels and lymph nodes of the human body by the scalpel, ensure the efficiency of catheterization, and reduce maintenance costs and the chance of postoperative external infection.

[0027] The expanding section 32 is arranged adjacent to the conical head armor 31, so that as soon as the conical head armor 31 enters the human body, the expanding section 32 expands the initial wound outward to prevent the wound from directly hugging the inner expansion tube 3 and affecting the smooth entry of the sheath tube body 1 into the wound.

[0028] Two operating wings 21 are radially extended outward from the middle of the sheath clamp 2; the two operating wings 21 are symmetrically arranged about the sheath clamp 2; when operating, the rear end of the sheath clamp 2 can be grasped by hand, basically into a fist shape; the fist-shaped hand can not only increase the friction with the rear end of the sheath clamp 2, but also act on the sheath body 1 through the operating wings 21, so that the sheath body 1 enters the blood vessel along with the inner dilation tube 3.

[0029] A conical head B 11 is provided at the front end of the sheath tube body 1 to facilitate the sheath tube body 1 to pass through the wound smoothly.

[0030] The working process of this embodiment is as follows: after the puncture needle is pulled out along the guide wire, a part of the guide wire remains in the blood vessel, and the other part remains outside the body; the end of the guide wire remaining outside the body passes through the inner expansion tube 3 along the tube opening of the inner expansion tube 3 at the conical head armor 31, and passes out from the rear end of the sheath clamp 2; one hand holds the end of the guide wire that has passed out, and the other hand holds the rear end of the sheath clamp 2, so that the bullet sheath slides along the guide wire until the conical head armor 31 abuts against the wound left by the puncture needle; the sheath clamp 2 is operated to make the conical head armor 31 pass through the wound smoothly; the sections of the inner expansion tube 3 begin to pass through the wound one after another wound; when the flared section 32 passes through the wound, the wound expands outward to facilitate the passage of the conical head B 11; then the sheath body 1 begins to pass through the expanded wound; the conical head B 11 of the sheath body 1 first passes through the expanded wound, and the other sections of the sheath body 1 pass through the expanded wound in turn; when the length of the sheath body 1 entering the blood vessel reaches the specified requirement, the guide wire is pulled out; the inner dilation tube 3 is pulled out; the catheter is inserted from the exposed outer end of the sheath body 1; when the catheter enters the blood vessel to a suitable length, the sheath body 1 is pulled out from the rear end of the catheter.

[0031] This embodiment is applicable to those situations where the rear end of the catheter does not hinder the withdrawal of the sheath tube body 1 .

[0032] Embodiment 2: Embodiment 2 is basically the same as Embodiment 1, and the similarities are not repeated here. The differences are as follows: the sheath clamp 2 comprises a tubular sheath clamp seat 22 and a fixed tube 23; the rear end of the sheath body 1 is fixedly connected to the front end of the sheath clamp seat 22; the sheath clamp seat 22 is provided with a fan-shaped notch extending axially therethrough; the inner end of the fan-shaped notch penetrates the tube wall of the sheath clamp seat 22; after the inner expansion tube 3 is pulled out and the catheter is introduced through the sheath body 1, the sheath clamp seat 22 can be divided into left and right halves along the fan-shaped notch, tearing the sheath body 1 and leaving the catheter; the operating wing 21 is staggered with the fan-shaped notch; the operating wing 21 is arranged on the sheath clamp seat 22; the rear end of the sheath clamp seat 22 is threadedly connected to the front end of the fixed tube 23, so that when the sheath body 1 is pushed forward, the sheath body 1, the sheath clamp seat 22 and the fixed tube 23 are ensured to be a whole, which is convenient for the operation of the sheath body 1.

[0033] The operating fin plate 21 is arranged to be tilted backward relative to the sheath tube clamp 2 , so as to increase the convenience of peeling the sheath tube body 1 .

[0034] The rear side of the operating fin plate 21 is uniformly provided with friction ridges 211, which increases the convenience of peeling the sheath tube body 1. The outer end of the operating fin plate 21 is provided with a forward-extending limit block 212, which improves the convenience of the glass sheath tube body 1.

[0035] An insertion cone tube 231 and an internal threaded tube 232 coaxial with the fixed tube 23 extend forward from the middle of the fixed tube 23; the internal threaded tube 232 is arranged outside the insertion cone tube 231, and is threadedly matched with the outer wall of the rear end of the sheath clamp seat 22; the front end of the insertion cone tube 231 exceeds the front end of the fixed tube 23; the rear end of the sheath clamp seat 22 is provided with an insertion cone cavity 222 coaxial with the sheath clamp seat 22; the insertion cone tube 231 is matched and inserted into the insertion cone cavity 222, which can ensure that the inner expansion tube 3 is concentrically arranged with the sheath tube body 1; the inner hole of the insertion cone tube 231 is fixedly connected to the outer wall of the inner expansion tube 3; when the inner expansion tube 3 is pulled out, the inner expansion tube 3 can be directly pulled out through the fixed tube 23.

[0036] A bell-mouth structure 233 with a narrow mouth in advance is provided in the middle of the fixed tube 23; a bonding gap 234 is left between the narrow mouth of the bell-mouth structure 233 and the outer wall of the inner expansion tube 3; the inner expansion tube 3 is glued and connected to the narrow mouth of the bell-mouth structure 233; the narrow mouth of the bell-mouth structure 233 is facing downwards; at this time, the bell-mouth structure 233 can guide the glue used for bonding, so that the glue gathers in the bonding gap 234, thereby ensuring a stable connection between the inner expansion tube 3 and the fixed tube 23.

[0037] The outer wall of the internal threaded tube 232 is evenly distributed with friction ridges 2321 to facilitate the operation of rotating the internal threaded tube 232 .

[0038] The fan-shaped notch includes a large notch 2211 and a small notch 2212; the large notch 2211 is arranged at the front end of the sheath clamp 22 to facilitate the sheath clamp 22 to be separated left and right; the small notch 2212 is arranged at the rear end of the sheath clamp 22, penetrating the operating fin 21, which can ensure that there is enough connection area between the fixed tube 23 and the internal threaded tube 232, thereby ensuring the connection strength.

[0039] A tear rib 2213 is provided at the inner end of the small notch 2212 ; the rear end of the sheath clamp 22 is connected to one body through the tear rib 2213 , which ensures the structural stability of the sheath clamp 22 and facilitates tearing of the sheath clamp 22 and the sheath body 1 .

[0040] Compared with the first embodiment, the present embodiment can be applied to those situations where the rear end of the catheter can hinder the withdrawal of the sheath tube body 1; correspondingly, the working process of the present embodiment is basically the same as the working process of the first embodiment; the similarities are not repeated here, and the difference lies in: after the guide wire is withdrawn, the fixing tube 23 is loosened to release the connection between the fixing tube 23 and the sheath tube clamp seat 22; the fixing tube 23 is operated to pull the inner expansion tube 3 out from between the sheath tube body 1; the catheter is inserted from the rear end of the sheath tube clamp seat 22; the catheter smoothly enters the blood vessel along the sheath tube body 1; when the catheter enters the blood vessel to a suitable length, the sheath tube body 1 is withdrawn from the human body from the rear end of the catheter; both hands act on the operating wing plate 21 respectively to make the operating wing plate 21 tilt forward relative to the sheath tube clamp seat 22; the sheath tube clamp seat 22 is separated to the left and right to form two parts; the two parts act on the sheath tube body 1, and also separate the sheath tube body 1 to the left and right, and peel the sheath tube body 1 from the catheter.

Claims

1. A bullet sheath, characterized in that: The utility model comprises a sheath tube body, a sheath tube clamp and an inner expansion tube made of elastic material; the inner expansion tube passes through the inside of the sheath tube body; the front end and the rear end of the inner expansion tube respectively exceed the front end and the rear end of the sheath tube body; the inner diameter of the inner expansion tube matches the outer diameter of the guide wire; the main body of the sheath tube clamp is tubular; the rear end of the sheath tube body is inserted into the front end of the sheath tube clamp; the rear end of the inner expansion tube is fixedly inserted into the rear end of the sheath tube clamp; a conical head is provided at the front end of the inner expansion tube; a flared section is provided at the part of the front end of the inner expansion tube exceeding the front end of the sheath tube clamp; the outer diameter of the flared section is greater than the inner diameter of the tube opening at the front end of the sheath tube body; and both ends of the flared section are smoothly transitionally connected with the inner expansion tube.

2. The bullet sheath according to claim 1, characterized in that: The flared section is arranged adjacent to the conical head armor.

3. The bullet sheath according to claim 1, characterized in that: Two operating fins are radially extended outward from the middle of the sheath tube clamp; the two operating fins are symmetrically arranged with respect to the sheath tube clamp.

4. The bullet sheath according to claim 3, characterized in that: The sheath clamp comprises a tubular sheath clamp seat and a fixed tube; the rear end of the sheath tube body is fixedly connected to the front end of the sheath clamp seat; the sheath clamp seat is provided with a fan-shaped notch which penetrates axially; the inner end of the fan-shaped notch penetrates the tube wall of the sheath clamp seat; the operating wing plate is staggered with the fan-shaped notch; the operating wing plate is arranged on the sheath clamp seat; the rear end of the sheath clamp seat is threadedly connected to the front end of the fixed tube.

5. The bullet sheath according to claim 4, characterized in that: The operating wing plate is arranged to be tilted backward relative to the sheath tube clamp.

6. The bullet sheath according to claim 5, characterized in that: The rear side of the operating fin is evenly distributed with friction ridges.

7. The bullet sheath according to claim 6, characterized in that: An insertion cone tube and an internal threaded tube coaxial with the fixed tube extend forward from the middle of the fixed tube; the internal threaded tube is arranged outside the insertion cone tube and matches with the outer wall thread of the rear end of the sheath tube clamp seat; the front end of the insertion cone tube exceeds the front end of the fixed tube; the rear end of the sheath tube clamp seat is provided with an insertion cone cavity coaxial with the sheath tube clamp seat; the insertion cone tube is matched and inserted into the insertion cone cavity; the inner hole of the insertion cone tube is fixedly connected with the outer wall of the inner expansion tube.

8. The bullet sheath according to claim 7, characterized in that: A bell mouth structure with a narrow mouth in front is arranged in the middle of the fixed pipe; a bonding gap is left between the narrow mouth of the bell mouth structure and the outer wall of the inner expansion pipe; and the inner expansion pipe is connected with the narrow mouth of the bell mouth structure by bonding.

9. The bullet sheath according to claim 7, characterized in that: The outer wall of the internal threaded pipe is evenly distributed with friction ridges.

10. The bullet sheath according to claim 1, characterized in that: A conical head B is arranged at the front end of the sheath tube body.

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