Catheter sheath

Abstract

The utility model relates to the technical field of medical instruments, and discloses a catheter sheath which comprises a sheath tube, the sheath tube comprises a sheath tube connector, a first connecting end and a second connecting end, and external threads are arranged on the outer wall of the end portion of one end of the first connecting end; the hemostasis valve connector comprises a second connecting end, and a first clamping ring is arranged on the outer wall of the second connecting end; a second clamping ring is arranged at one end of the connecting piece, a connecting channel is formed in the connecting piece, internal threads matched with the external threads are arranged on the inner wall of the connecting channel, the end, provided with the second clamping ring, of the connecting piece penetrates through the first clamping ring and is arranged outside the hemostasis valve connector in a sleeving mode, and the second connecting end is inserted into the first connecting end. One side of the first clamping ring abuts against the second clamping ring, and the external thread is meshed with the internal thread; when the end face of the first connecting end abuts against the other side of the first clamping ring, the sheath tube connector, the hemostasis valve connector and the connecting piece need to meet the formula d1 + d2gt, d3 + 1P, and d3gt; and d2, the connection can be firmer when the formula is met.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical instrument technical field especially, relate to a kind of catheter sheath. BACKGROUND

[0002] As the auxiliary guide instrument of peripheral and intracardiac minimally invasive intervention surgery, the dilating assembly composed of catheter sheath and dilator plays an important role in interventional therapy. The catheter sheath generally refers to a thin-walled tubular sleeve mainly composed of a dilator, a sheath tube, and a hemostatic valve. The catheter sheath is a common interventional medical instrument that can introduce external liquid medicine or diagnostic or therapeutic instruments into the blood vessels of a patient without the need for re-needling, achieving medical treatment of the patient and avoiding the pain of multiple needle insertions.

[0003] The existing catheter sheath has a connection part fixedly arranged on the hemostatic valve joint to connect the sheath tube joint. The sheath tube joint is fixedly connected with the connection part and cannot be detached. Moreover, the passage for the dilator to enter the hemostatic valve joint is sealed by a sealing gasket. During use, the dilator usually directly passes through the sealing gasket to enter the sheath tube body. In this case, when the catheter sheath is used as a passageway for other instruments, the effective size of the passage is limited due to the sealing gasket, resulting in the inability to pass other instruments with a slightly larger outer diameter. SUMMARY

[0004] The utility model provides a kind of catheter sheath to solve the technical problem that hemostatic valve joint and sheath tube joint cannot be detached, and the effective size of passage is limited, other instruments with slightly larger outer diameter cannot be passed.

[0005] To solve the above technical problems, the utility model embodiment provides the sheath tube, which comprises:

[0006] The sheath tube joint comprises a first connecting end, and an outer thread is arranged on the outer wall of the end portion of one end of the first connecting end.

[0007] The hemostatic valve joint comprises a second connecting end, and a first clasp is arranged on the outer wall of the second connecting end.

[0008] The connecting piece has a second clasp at one end, a connecting channel is arranged in the connecting piece, an inner thread that cooperates with the outer thread is arranged on the inner wall of the connecting channel, and the end of the connecting piece provided with the second clasp passes through the first clasp and is sleeved outside the hemostatic valve joint, the second connecting end is inserted into the first connecting end, the side of the first clasp abuts against the second clasp, and the outer thread engages with the inner thread.

[0009] Wherein, when the end face of the first connecting end abuts against the other side of the first clamping ring, the sheath joint, the hemostasis valve joint and the connecting piece need to satisfy the formula: d1+d2>d3+1P, and d3>d2, wherein, d1 is the length of the internal thread, d2 is the minimum distance from the contact side of the first clamping ring and the second clamping ring to the first connecting end, d3 is the distance between the second clamping ring and the external thread, and P is the pitch.

[0010] Further, an accommodating groove for accommodating the first clamping ring is arranged on the inner wall of the connecting channel, the accommodating groove is located between the second clamping ring and the internal thread, and the second connecting end is inserted into the first connecting end so that the first clamping ring is clamped into the accommodating groove.

[0011] Further, a slope is arranged on the second clamping ring, and one end of the slope is inclined downward from the end face of the outer side of the second clamping ring to the middle part of the connecting channel.

[0012] Further, the outer diameter of the first clamping ring is greater than the inner diameter of the second clamping ring.

[0013] Further, the first connecting end is a 6% Luer internal conical joint, and the second connecting end is a 6% Luer external conical joint.

[0014] Further, the hemostasis valve joint further comprises a third connecting end, the third connecting end is provided with a first channel port, a second channel port and a third channel port, the first channel port and the third channel port are oppositely arranged, the second connecting end is connected at the third channel port, a cover plate is arranged on the first channel port, a through hole for passing through a dilator is arranged in the middle part of the cover plate, a boss is arranged on the end face of the first channel port, and the cover plate is matched with the boss.

[0015] Further, a mounting groove is arranged on one end of the cover plate towards the hemostasis valve joint, a sealing gasket is mounted in the mounting groove, and a cross-shaped cutout is arranged on the sealing gasket.

[0016] Further, a one-word cutout is punched on each side of the sealing gasket, the one-word cutouts on the two sides form the cross-shaped cutout, and the depth of the one-word cutout is half of the thickness of the sealing gasket.

[0017] Further, the sheath further comprises a three-way switch and a sheath tube body, the three-way switch is connected with the third channel port through a catheter, and the sheath tube body is connected on the sheath joint.

[0018] Further, a dilator is also included, the dilator comprising a dilator joint and a dilator tube connected to the dilator joint, the tube diameter of the end of the dilator tube gradually decreases, and in use, the end of the dilator tube penetrates into the sheath tube through the sealing gasket, the second connecting end and the first connecting end.

[0019] The embodiment of the utility model has the advantages of:

[0020] The second connecting end of the hemostasis valve joint can be inserted into the first connecting end of the sheath joint, one end of the connecting piece provided with the second clasp passes through the first clasp and is sleeved outside the second connecting end, the end of the first connecting end is provided with external threads, the inner wall of the connecting piece is provided with internal threads, the first connecting end is screwed into the connecting piece by rotating the connecting piece, the connecting piece can fix the hemostasis valve joint and the sheath joint, and the installation is convenient. Since the connecting piece is sleeved outside the hemostasis valve joint, the connecting piece can move relative to the hemostasis valve joint, when the hemostasis valve joint is not needed, the first connecting end can be screwed out of the connecting piece by reversely rotating the connecting piece, so that the hemostasis valve joint is separated from the sheath joint, the connecting piece can move relative to the hemostasis valve joint, and the reverse rotation of the connecting piece does not affect the use of the sheath tube in the surgical process. In the case that the end face of the first connecting end abuts against the other side of the first clasp, the sheath joint, the hemostasis valve joint and the connecting piece satisfy the formula: d1+d2>d3+1P, and d3>d2, so that the external threads of the sheath joint and the internal threads of the connecting piece can be engaged, and the reliable connection and convenient disassembly between the sheath joint and the connecting piece are ensured. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a structural schematic view of a catheter sheath;

[0022] Figure 2 is a sectional view of a sheath joint;

[0023] Figure 3 is a sectional view of a hemostasis valve joint;

[0024] Figure 4 is a sectional view of a connecting piece;

[0025] Figure 5 is a schematic view of the connection of a hemostasis valve joint and a connecting piece;

[0026] Figure 6 is a schematic view of the connection of a sheath joint, a hemostasis valve joint and a connecting piece.

[0027] In the drawings, the reference signs of the drawings of the specification are as follows:

[0028] 10, sheath, 11, sheath joint, 111, first connecting end, 112, external thread, 12, connecting piece, 121, second snap ring, 1211, slope, 122, internal thread, 123, mounting groove, 13, hemostasis valve joint, 131, second connecting end, 132, third connecting end, 133, first snap ring, 134, cover plate, 135, gasket, 136, first passage opening, 137, second passage opening, 138, third passage opening, 14, three-way switch, 15, sheath tube, 16, catheter, 20, dilator, 21, dilator joint, 22, dilator tube. DETAILED DESCRIPTION

[0029] The specific embodiments of the present application will be further described in conjunction with the drawings and examples. The following examples are used to illustrate the present application, but not to limit the scope of the present application.

[0030] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0031] In the description of the present application, it should be noted that, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, it can be directly connected, or indirectly connected through an intermediate medium, it can be the communication between two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] In the present application, unless specifically defined and limited otherwise, "on" or "under" of a first feature to a second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, "on", "above" and "over" of a first feature to a second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. "Under", "below" and "underneath" of a first feature to a second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0033] Please refer to Figures 1 to 6 The sheath provided by the embodiment of the present application comprises a sheath tube 10, the sheath tube 10 comprises:

[0034] The sheath tube joint 11 comprises a first connecting end 111, and an outer thread 112 is arranged on the end surface of one end of the first connecting end 111.

[0035] The hemostasis valve joint 13 comprises a second connecting end 131, and a first clamping ring 133 is arranged on the outer wall of the second connecting end 131.

[0036] The connecting piece 12 is provided with a second clamping ring 121 at one end, and the connecting piece 12 is provided with a connecting channel, an inner thread 122 that is matched with the outer thread 112 is arranged on the inner wall of the connecting channel, and the one end of the connecting piece 12 provided with the second clamping ring 121 passes through the first clamping ring 133 and is sleeved outside the hemostasis valve joint 13, the second connecting end 131 is inserted into the first connecting end 111, the side of the first clamping ring 133 abuts against the second clamping ring 121, and the outer thread 112 is engaged with the inner thread 122.

[0037] In the embodiment, when the end surface of the first connecting end 111 abuts against the other side of the first clamping ring 133, the sheath tube joint 11, the hemostasis valve joint 13 and the connecting piece 12 need to satisfy the formula: d1+d2>d3+1P, and d3>d2, wherein d1 is the length of the inner thread 122, d2 is the minimum distance from the contact side of the first clamping ring 133 to the second clamping ring 121 to the first connecting end 111, d3 is the distance between the second clamping ring 121 and the outer thread 112, and P is the pitch.

[0038] Specifically, the hemostasis valve joint 13 and the sheath tube joint 11 are both tubular structures.

[0039] Preferably, the first connecting end 111 is a 6% Luer inner conical joint, and the second connecting end 131 is a 6% Luer outer conical joint.

[0040] Specifically, the pipe diameter of the connecting channel is greater than the outer diameter of the first connecting end 111 of the sheath tube joint 11.

[0041] Specifically, the inner diameter of the second clamping ring 121 is smaller than the outer diameter of the first clamping ring 133, so that the second clamping ring 121 can be limited on the inner side of the first clamping ring 133 and cannot slide out of the second connecting end 131, thereby achieving limiting.

[0042] In the embodiment, as shown in Figure 3 , 4 both sides of the first clamping ring 133 and the second clamping ring 121 are flat. In other embodiments, as shown in Figure 5 one side of the end face of the first clamping ring 133 facing the second connecting end 131 is beveled, and the other side is flat. The second clamping ring 121 can pass through the first clamping ring 133 along the bevel, which is more labor-saving and convenient to install.

[0043] As shown in Figure 4 , preferably, the second clamping ring 121 can be provided with a slope 1211, one end of the slope 1211 being inclined downward from the end face of the outer side of the second clamping ring 121 to the middle of the connecting channel. During the process of the second clamping ring 121 passing through the first clamping ring 133, the first clamping ring 133 can slide along the slope 1211, so that the second clamping ring 121 passes through the first clamping ring 133, which is convenient to install.

[0044] As shown in Figure 5 , specifically, one end of the second clamping ring 121 of the connecting piece 12 passes through the first clamping ring 133 and is sleeved outside the hemostatic valve connector 13, which means that one end of the second clamping ring 121 of the connecting piece 12 passes through the first clamping ring 133, so that the second clamping ring 121 is clamped on one side of the first clamping ring 133, and the other side of the first clamping ring 133 is inserted into the first connecting end 111. It can be understood that the connecting piece 12 and the hemostatic valve connector 13 are detachably connected, and the connecting piece 12 can move relative to the hemostatic valve connector 13.

[0045] The installation process of the sheath 10 is as follows:

[0046] One end of the second clamping ring 121 of the connecting piece 12 passes through the first clamping ring 133, so that the connecting piece 12 is sleeved outside the hemostatic valve connector 13, the second connecting end 131 of the hemostatic valve connector 13 is inserted into the first connecting end 111 of the sheath connector 11, the end face of the outer thread 112 of the first connecting end 111 abuts against the end face of the inner thread 122, and the connecting piece 12 is rotated to make the outer thread 112 engage with the inner thread 122, so that the connecting piece 12 fixes the hemostatic valve connector 13 and the sheath connector 11.

[0047] To ensure that the outer thread 112 of the sheath connector 11 can engage with the inner thread 122 of the connecting piece 12, as shown in Figure 6As shown, when the end face of the first connecting end 111 moves to abut against the side wall of the first retaining ring 133, the sheath connector 11, the hemostatic valve connector 13, and the connecting piece 12 must satisfy the following formula: d1+d2>d3+1P, and d3>d2, where d1 is the length of the internal thread 122, d2 is the minimum distance from the contact side of the first retaining ring 133 and the second retaining ring 121 to the first connecting end 111, d3 is the distance between the second retaining ring 121 and the external thread 112, and P is the thread pitch. Thus, when this formula is satisfied, the connection between the sheath connector and the connecting piece is secure, and the threaded connection facilitates assembly and disassembly.

[0048] In this embodiment, the second connecting end 131 of the hemostatic valve connector 13 can be inserted into the first connecting end 111 of the sheath connector 11. One end of the connector 12, which has a second retaining ring 121, passes through the first retaining ring 133 and is fitted over the second connecting end 131. The end of the first connecting end 111 has an external thread 112, and the inner wall of the connector 12 has an internal thread 122. Rotating the connector 12 screws the first connecting end 111 into the connector 12, thereby fixing the hemostatic valve connector 13 and the sheath connector 11. Since the connector 12 is fitted over the hemostatic valve connector 13, it can move relative to the hemostatic valve connector 13. When the hemostatic valve connector 13 is not needed, the connector 12 can be rotated in the opposite direction to unscrew the first connecting end 111 from the connector 12, thus detaching the hemostatic valve connector 13 from the sheath connector 11. Furthermore, the connector 12 can move relative to the hemostatic valve connector 13, and unscrewing the connector 12 in the opposite direction during surgery does not affect the use of the sheath body 15.

[0049] Specifically, the inner wall of the connecting channel is provided with a receiving groove for accommodating the first retaining ring 133. The receiving groove is located between the second retaining ring 121 and the internal thread 122. The second connecting end 131 is inserted into the first connecting end 111, so that the first retaining ring 133 is engaged in the receiving groove.

[0050] like Figure 3 As shown, specifically, the hemostatic valve connector 13 also includes a third connecting end 132. The third connecting end 132 is provided with a first channel port 136, a second channel port 137 and a third channel port 138. The first channel port 136 and the third channel port 138 are arranged opposite to each other. The second connecting end 131 is connected to the third channel port 138. The first channel port 136 is provided with a cover plate 134. The middle part of the cover plate 134 is provided with a through hole for the expander 20 to pass through. The end face of the first channel port 136 is provided with a boss. The cover plate 134 cooperates with the boss.

[0051] In this embodiment, the first connecting end 111 and the third connecting end 132 can be integrally molded parts, which facilitates processing and production.

[0052] The first channel opening 136 and the third channel opening 138 are positioned opposite each other, so that the expander tube 22 can pass through and enter the sheath tube 15.

[0053] Specifically, the cover plate 134 and the boss can be fixed by interference fit.

[0054] Specifically, the cover plate 134 has an installation groove 123 at one end facing the hemostatic valve connector 13, and a sealing gasket 135 is installed in the installation groove 123. The sealing gasket 135 has a cross-shaped cut.

[0055] More specifically, the sealing gasket 135 has a slotted cut punched on both sides, forming a cross-shaped cut, and the depth of the slotted cut is half the thickness of the sealing gasket 135.

[0056] In this embodiment, cross-shaped cuts are formed on both sides, and a tiny through hole is formed in the center of the cross-shaped cuts. When using the expander 20, the expander tube 22 can be aligned with the through hole and enter the hemostatic valve connector 13. When not in use or after the expander 20 is pulled out, the through hole will not leak and will return to a sealed state.

[0057] like Figure 1 As shown, the sheath 10 in this embodiment also includes a three-way switch 14 and a sheath body 15. The three-way switch 14 is connected to the third channel port 138 via a conduit 16, and the sheath body 15 is connected to the sheath connector 11. When disassembling the hemostatic valve connector 13, the conduit 16 connected to the hemostatic connector and the three-way switch 14 are also disassembled.

[0058] The catheter 16 sheath in this embodiment also includes a dilator 20, which includes a dilator connector 21 and a dilator tube 22 connected to the dilator connector 21. The diameter of the end of the dilator tube 22 gradually decreases. In use, the end of the dilator tube 22 passes through the sealing gasket 135, the second connecting end 131 and the first connecting end 111 and enters the sheath tube 15.

[0059] Specifically, one end of the expander tube 22 is fixedly connected to the expander connector 21, and the diameter of the end of the expander tube 22 gradually decreases to facilitate insertion into the hemostatic valve connector 13.

[0060] The hemostatic valve joint 13 can be disassembled when the catheter 16 sheath does not need to use the hemostatic valve joint 13 in the operation process, and the end of the dilator pipe body 22 can be inserted into the hemostatic valve joint 13 and into the sheath pipe body 15 through the through hole of the sealing gasket 135 when the hemostatic valve joint 13 needs to be used. At the same time, since the sealing gasket 135 needs to be passed through to enter the sheath pipe body 15, the effective size of the first passage opening 136 of the hemostatic valve joint 13 is limited when the catheter 16 sheath is used as a passage for other instruments, so that other instruments with a slightly larger outer diameter cannot pass through. The hemostatic valve joint 13 can be disassembled in the embodiment, so that other instruments can be directly inserted into the sheath joint 11, and the influence of the sealing gasket 135 is avoided, so that a more smooth passage is provided for other instruments.

[0061] The above specific embodiments further specifically describe the purpose, technical scheme and beneficial effects of the utility model, and it should be understood that the above description is only for specific embodiments of the utility model and is not used to limit the protection scope of the utility model. It is particularly pointed out that, for those skilled in the art, any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A catheter sheath characterized by, The sheath comprises: The sheath connector comprises a first connecting end, and an outer thread is arranged on the end face of one end of the first connecting end; The hemostatic valve connector comprises a second connecting end, and a first clamping ring is arranged on the outer wall of the second connecting end; and The connecting piece comprises a second clamping ring arranged on one end thereof, and a connecting channel is arranged in the connecting piece, wherein an inner thread is arranged on the inner wall of the connecting channel and cooperates with the outer thread, one end of the connecting piece provided with the second clamping ring penetrates through the first clamping ring and is sleeved outside the hemostatic valve connector, the second connecting end is inserted into the first connecting end, the side of the first clamping ring abuts against the second clamping ring, and the outer thread is engaged with the inner thread. When the end face of the first connecting end abuts against the other side of the first clamping ring, the sheath connector, the hemostatic valve connector and the connecting piece need to satisfy the formula: d1+d2>d3+P, and d3>d2, wherein d1 is the length of the inner thread, d2 is the minimum distance from the contact side of the first clamping ring and the second clamping ring to the first connecting end, d3 is the distance between the second clamping ring and the outer thread, and P is the pitch.

2. The catheter sheath of claim 1, wherein, An accommodating groove for accommodating the first clamping ring is arranged on the inner wall of the connecting channel, and the accommodating groove is located between the second clamping ring and the inner thread, and the second connecting end is inserted into the first connecting end, so that the first clamping ring is clamped into the accommodating groove.

3. The catheter sheath of claim 1, wherein, A slope is arranged on the second clamping ring, and one end of the slope is inclined downward from the end face of the outer side of the second clamping ring to the middle part of the connecting channel.

4. The catheter sheath of claim 1, wherein, The outer diameter of the first clamping ring is greater than the inner diameter of the second clamping ring.

5. The catheter sheath of claim 1, wherein, The first connecting end is a 6% luer inner conical connector, and the second connecting end is a 6% luer outer conical connector.

6. The catheter sheath of claim 5, wherein, The hemostatic valve connector further comprises a third connecting end, and the third connecting end is provided with a first channel opening, a second channel opening and a third channel opening, the first channel opening and the third channel opening are oppositely arranged, the second connecting end is connected at the third channel opening, a cover plate is arranged on the first channel opening, a through hole for passing through a dilator is arranged in the middle part of the cover plate, a boss is arranged on the end face of the first channel opening, and the cover plate cooperates with the boss.

7. The catheter sheath of claim 6, wherein, An installation groove is arranged on one end of the hemostatic valve connector, and a sealing gasket is arranged in the installation groove, and a cross-shaped cut is arranged on the sealing gasket.

8. The catheter sheath of claim 7, wherein, A one-character cut is punched on each side of the sealing gasket, the one-character cuts on the two sides form the cross-shaped cut, and the depth of the one-character cut is half of the thickness of the sealing gasket.

9. The catheter sheath of claim 7, wherein, The sheath further comprises a three-way switch and a sheath tube body, the three-way switch is connected with the third channel opening through a catheter, and the sheath tube body is connected with the sheath connector.

10. The catheter sheath of claim 9, wherein, Further comprising a dilator, the dilator comprises a dilator connector and a dilator tube body connected with the dilator connector, and the tube diameter of the distal end of the dilator tube body gradually decreases, in use, the distal end of the dilator tube body penetrates through the sealing gasket, the second connecting end and the first connecting end and enters the sheath tube body.

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