Disposable blood vessel guiding sheath
By designing the sheath mechanism of the disposable vascular guide sheath, the sealing of the hemostatic valve is enhanced by the dislocation and alternating cross-cutting structure, and through the alternative valve pad design, the problem that the hemostatic valve cannot be completely sealed and easily damaged in the prior art is solved, and the use effect of the catheter sheath is improved.
Patent Information
- Application Number
- CN202322849626.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-10-24
- Publication Date
- 2025-03-04
- Estimated Expiration
- 2033-10-24
AI Technical Summary
The hemostatic valve in the existing blood vessel guide sheath cannot be completely sealed when it is passed into other instruments, resulting in blood leakage, and the hemostatic valve is prone to damage after multiple punctures.
A disposable vascular guide sheath is designed, adopting a structure including an expansion mechanism and a sheath mechanism, in which the hemostatic valve of the sheath mechanism is in a dislocation alternating structure through two sets of cross-cut slots, increasing sealing, and designing through a threaded valve seat and valve cover to facilitate replacement of the valve pad after the sealing loss.
Through the dislocation and alternating cross-cut structure, the sealing of the hemostatic valve is enhanced, preventing air from entering and returning blood, improving the resilience of the catheter sheath, and extending the service life through an alternative valve pad design.
Smart Images
Figure CN222549295U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of medical devices, in particular to a disposable vascular guide sheath. Background Art
[0002] Vascular guide sheath plays an important role in interventional treatment. Vascular guide sheath generally refers to a thin-walled tubular sheath mainly composed of a dilator, a dilator tube, and a hemostatic valve. Vascular guide sheath is a common interventional medical device that can introduce external medicine or diagnostic or therapeutic equipment into the patient's blood vessels without the need for re-insertion of the needle, thereby achieving medical treatment for the patient and avoiding the pain of multiple needle insertions for the patient.
[0003] The hemostatic valve in the vascular guide sheath cannot be completely sealed when other instruments are passed through, resulting in blood leakage. The surface of the hemostatic valve is easily damaged after multiple punctures. For this reason, we have proposed a disposable vascular guide sheath. Utility Model Content
[0004] In view of the deficiencies of the prior art, the utility model provides a disposable vascular guide sheath, which solves the problems raised by the above-mentioned background technology.
[0005] The technical solution adopted by the utility model to solve the technical problem is: a disposable vascular guide sheath comprises an expansion mechanism and a sheath tube mechanism;
[0006] The sheath tube mechanism comprises a sheath tube, the rear end of the sheath tube is connected to a hemostatic valve, the outside of the hemostatic valve is connected to an extension tube, and the free end of the extension tube is connected to a three-way valve;
[0007] The hemostatic valve includes a valve seat, and a first valve pad and a second valve pad are sequentially arranged inside the rear end of the valve seat, two groups of cross slits in a staggered alternating structure are arranged in the center of the first valve pad and the second valve pad, the edges of the first valve pad and the second valve pad are commonly connected with a connecting piece, and the rear end of the valve seat is externally threadedly connected with a valve cover.
[0008] Preferably, the expansion mechanism comprises an expansion tube, the front end of the expansion tube is configured as a conical structure, and the rear end of the expansion tube is connected to a connecting seat.
[0009] Preferably, the dilation tube and the sheath tube have the same structure and are both composed of an inner layer, a middle layer and an outer layer.
[0010] Preferably, the inner layers of each group are made of polytetrafluoroethylene material, the middle layers of each group are woven structures and are made of stainless steel material, and the outer layers of each group are made of segmented polyetheramide resin material.
[0011] Preferably, the front end of the valve seat is connected to the rear end of the sheath tube, a guiding inclined groove is provided on the inner surface of the rear end of the valve seat near the first valve pad, and a side port is provided on the annular wall of the valve seat.
[0012] Preferably, an outer surface of the rear end of the valve seat is provided with an outer thread, and an inner surface of the front end of the valve cover is provided with an inner thread, and the structures of the inner thread and the outer thread are matched.
[0013] The beneficial effects of the utility model are:
[0014] 1. The disposable vascular guide sheath of the utility model, when other instruments are introduced into the hemostatic valve, two groups of cross slits are passed through the center of the first valve pad and the second valve pad, and the fan-shaped pieces in the center of the first valve pad and the second valve pad flip toward the front end. Since the two groups of cross slits are in a staggered alternating structure, the fan-shaped pieces in the center of the first valve pad and the second valve pad can complement each other, thereby increasing the sealing performance, preventing air from entering the passage to cause air embolism and blood reflux, etc., and improving the fit of the catheter sheath. The rear end of the valve seat and the front end of the valve cover are threadedly connected, so that after the hemostatic valve is punctured multiple times and the sealing effect is lost, the first valve pad and the second valve pad can be replaced.
[0015] 2. The disposable vascular guide sheath of the utility model has excellent chemical corrosion resistance and temperature resistance by selecting polytetrafluoroethylene material for the inner layer, 304 stainless steel wire braiding for the middle layer, which has the effect of reducing hardness and improving plasticity, and the block polyetheramide resin material for the outer layer has strong flexibility and high resilience, so that the guide sheath has good flexibility, stable structure and easy operation. And according to the different functions of each part of the dilator and sheath, the block polyetheramide resin material of the outer layer is divided into three categories according to hardness, and 72D, 55D and 35D are selected from the proximal to the distal end, respectively, with high overall stability and convenient operation control. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The utility model is further described below in conjunction with the accompanying drawings and embodiments.
[0017] Figure 1 It is a structural schematic diagram of the utility model;
[0018] Figure 2 It is a top view of the dilation tube and the sheath tube in the utility model;
[0019] Figure 3 yes Figure 2 Cross-sectional view of the middle BB;
[0020] Figure 4 It is a top view of the hemostasis valve in the utility model;
[0021] Figure 5 yes Figure 4 Sectional view of AA. DETAILED DESCRIPTION
[0022] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.
[0023] Figure 1 , Figure 2 and Figure 3 As shown, the disposable vascular introducer sheath comprises an expansion mechanism and a sheath mechanism.
[0024] The sheath tube mechanism comprises a sheath tube 3 , the rear end of the sheath tube 3 is connected to a hemostatic valve 4 , the outside of the hemostatic valve 4 is connected to an extension tube 5 , and the free end of the extension tube 5 is connected to a three-way valve 6 .
[0025] The expansion mechanism includes an expansion tube 1, the front end of the expansion tube 1 is set as a conical structure, the rear end of the expansion tube 1 is connected to a connecting seat 2, the expansion tube 1 and the sheath tube 3 have the same structure, and are both composed of an inner layer 7, a middle layer 8 and an outer layer 9, each group of inner layers 7 are made of polytetrafluoroethylene material, each group of middle layers 8 are woven structures and are made of stainless steel, and each group of outer layers 9 are made of segmented polyetheramide resin material.
[0026] It should be noted that the inner layer 7 is made of polytetrafluoroethylene material, which has excellent chemical corrosion resistance and temperature resistance. The middle layer 8 is made of 304 stainless steel wire weaving, which has the effect of reducing hardness and improving plasticity. The outer layer 9 is made of block polyetheramide resin material, which has strong flexibility and high resilience.
[0027] According to the different functions of each part of the dilation tube 1 and the sheath tube 3, the block polyetheramide resin material of the outer layer 9 is divided into three categories according to hardness, 72D, 55D, and 35D are selected from the proximal end to the distal end, respectively, with high overall stability and convenient operation control.
[0028] Figure 4 and Figure 5 As shown, the hemostatic valve 4 includes a valve seat 41, and the first valve pad 42 and the second valve pad 43 are sequentially arranged inside the rear end of the valve seat 41, and two groups of cross slits in a staggered alternating structure are arranged in the center of the first valve pad 42 and the second valve pad 43, and the edges of the first valve pad 42 and the second valve pad 43 are commonly connected with a connecting piece 44, and the rear end of the valve seat 41 is externally threadedly connected with a valve cover 45, and the front end of the valve seat 41 is connected to the rear end of the sheath tube 3, and a guide inclined groove 46 is provided on the inner surface of the rear end of the valve seat 41 and near the first valve pad 42, and a side port 47 is provided on the annular wall of the valve seat 41, and an external thread is provided on the outer surface of the rear end of the valve seat 41, and an internal thread is provided on the inner surface of the front end of the valve cover 45, and the structures of the internal thread and the external thread are adapted to each other.
[0029] It should be noted that when other instruments are passed through the hemostatic valve 4, the two sets of cross slits pass through the center of the first valve pad 42 and the second valve pad 43, and the fan-shaped pieces in the center of the first valve pad 42 and the second valve pad 43 flip toward the front end. Since the two sets of cross slits are in an offset alternating structure, the fan-shaped pieces in the center of the first valve pad 42 and the second valve pad 43 can complement each other, thereby increasing the sealing performance. The rear end of the valve seat 41 and the front end of the valve cover 45 are threadedly connected, so that after the hemostatic valve 4 is punctured multiple times and the sealing effect is lost, the first valve pad 42 and the second valve pad 43 can be replaced. Furthermore, the side port 47 is connected to the extension tube 5.
[0030] Working principle: First, a small incision is made on the skin with a scalpel at the puncture site. The puncture site is punctured with a puncture needle, and then the guide wire is inserted along the needle tube. The sheath mechanism with the dilator inserted is inserted into the blood vessel through the tail end of the guide wire, and then the dilator and guide wire can be withdrawn to establish a percutaneous access pathway for the intravascular device.
[0031] When other instruments are passed through the hemostatic valve 4, the two sets of cross slits pass through the center of the first valve pad 42 and the second valve pad 43, and the fan-shaped pieces in the center of the first valve pad 42 and the second valve pad 43 flip toward the front end. Since the two sets of cross slits are in an offset alternating structure, the fan-shaped pieces in the center of the first valve pad 42 and the second valve pad 43 can complement each other, thereby increasing the sealing performance. The rear end of the valve seat 41 and the front end of the valve cover 45 are threadedly connected, so that after the hemostatic valve 4 is punctured multiple times and the sealing function is lost, the first valve pad 42 and the second valve pad 43 can be replaced.
[0032] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.
Claims
1. A disposable vascular guide sheath, characterized by: It includes a dilation mechanism and a sheath mechanism; The sheath tube mechanism comprises a sheath tube (3), the rear end of the sheath tube (3) is connected to a hemostatic valve (4), the outside of the hemostatic valve (4) is connected to an extension tube (5), and the free end of the extension tube (5) is connected to a three-way valve (6); The hemostatic valve (4) comprises a valve seat (41), a first valve pad (42) and a second valve pad (43) are sequentially arranged inside the rear end of the valve seat (41), two groups of cross slits in a staggered alternating structure are arranged at the center of the first valve pad (42) and the second valve pad (43), the edges of the first valve pad (42) and the second valve pad (43) are commonly connected with a connecting piece (44), and the rear end of the valve seat (41) is externally threadedly connected with a valve cover (45).
2. The disposable vascular guide sheath according to claim 1, characterized in that: The expansion mechanism comprises an expansion tube (1), the front end of the expansion tube (1) being arranged as a conical structure, and the rear end of the expansion tube (1) being connected to a connecting seat (2).
3. The disposable vascular guide sheath according to claim 2, characterized in that: The dilation tube (1) and the sheath tube (3) have the same structure and are both composed of an inner layer (7), a middle layer (8) and an outer layer (9).
4. The disposable vascular guide sheath according to claim 3, characterized in that: Each group of inner layers (7) is made of polytetrafluoroethylene material, each group of intermediate layers (8) is a woven structure and is made of stainless steel material, and each group of outer layers (9) is made of segmented polyetheramide resin material.
5. The disposable vascular guide sheath according to claim 1, characterized in that: The front end of the valve seat (41) is connected to the rear end of the sheath tube (3), a guide groove (46) is provided on the inner surface of the rear end of the valve seat (41) and close to the first valve pad (42), and a side opening (47) is provided on the annular wall of the valve seat (41).
6. The disposable vascular guide sheath according to claim 1, characterized in that: The rear end outer surface of the valve seat (41) is provided with an external thread, and the front end inner surface of the valve cover (45) is provided with an internal thread, and the structures of the internal thread and the external thread are matched.