Vascular puncture sheath convenient to fix and turn

Abstract

The invention provides a blood vessel puncture sheath convenient to fix and steer. The blood vessel puncture sheath comprises a puncture seat; the inner sheathing canal is communicated with the lower end of the puncture seat; the outer sheath tube is movably arranged on the outer side of the inner sheath tube in a sleeving manner; the metal support is fixedly arranged at the lower end of the outer sheath tube; wherein a cavity is formed between the inner sheath tube and the outer sheath tube, a plurality of through holes communicated with the cavity are formed in the tube wall of the outer sheath tube, the metal support comprises a plurality of memory metal wires, the lower ends of the memory metal wires are fixed to the outer wall of the outer sheath tube, and the upper ends of the memory metal wires penetrate into the cavity through the corresponding through holes and are connected to the tube wall of the inner sheath tube; an adjusting mechanism located above the metal support is further arranged in the cavity, and the outer sheath tube moves relative to the inner sheath tube so as to drive the adjusting mechanism to control the metal support to be unfolded or folded. The puncture sheath can be prevented from being separated from a blood vessel in an operation, so that the stability of the puncture sheath in the blood vessel is improved, and a clinician is assisted in operating a guide wire to steer.

Description

Technical Field

[0001] The invention relates to the field of medical instruments, in particular to a blood vessel puncture sheath which is convenient for fixing and turning. Background Art

[0002] Vascular puncture sheath is a medical device used for vascular puncture. Its main function is to establish a surgical channel from the skin to the blood vessel, so that surgical instruments such as catheters and guide wires can enter the blood vessel and reach the lesion site;

[0003] At present, common vascular puncture sheaths have many problems during the operation. For example, it is difficult for the sheath to remain stably punctured in the blood vessel during the operation, and the sheath often falls off during the operation, which requires medical staff to perform a second puncture on the patient, increasing the difficulty of the operation, the incidence of puncture complications and harm to the patient. In addition, when it is necessary to treat blood vessels in different directions / locations that are very close to the same end of the blood vessel and it is difficult to select the target blood vessel, or when it is necessary to perform surgery on the other end of the vascular sheath, the existing vascular sheaths cannot adjust the direction. At this time, a second puncture is required to point the vascular puncture sheath to the target blood vessel. The second puncture also increases the difficulty of the operation, increases the risk of puncture complications and harm to the patient. In many cases, the specificity and difficulty of the anatomy lead to the failure of the puncture, which will affect the outcome of the entire operation.

[0004] Secondly, due to the poor stability of the sheath in the blood vessel, when the clinician inserts the guidewire or other introduction and delivery devices used for vascular intervention into the sheath and during the delivery process, the guidewire or other introduction and delivery devices will inevitably come into contact with the sheath, thereby causing the sheath to move. This phenomenon further increases the difficulty for the clinician to operate the guidewire or other introduction and delivery devices to turn, making the operation process longer and requiring higher surgical experience from the clinician. Summary of the invention

[0005] The purpose of the present invention is to provide a vascular puncture sheath that is easy to fix and turn, which can prevent the puncture sheath from detaching from the blood vessel during surgery, thereby improving the stability of the puncture sheath in the blood vessel, and further assisting clinical physicians in operating the guide wire to turn and facilitate entry into the target blood vessel.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] A vascular puncture sheath convenient for fixation and steering, comprising:

[0008] Piercing seat;

[0009] An inner sheath tube connected to the lower end of the puncture seat;

[0010] An outer sheath tube is movably mounted on the outer side of the inner sheath tube;

[0011] A metal stent is fixed at the lower end of the outer sheath tube and is used to fix the outer sheath tube in the blood vessel;

[0012] There is a longitudinally extending chamber between the inner sheath tube and the outer sheath tube, a plurality of through holes communicating with the chamber are provided on the tube wall of the outer sheath tube, and the metal bracket comprises a plurality of memory metal wires, the lower ends of the memory metal wires are fixed on the outer wall of the outer sheath tube, and the upper ends thereof penetrate into the chamber through the corresponding through holes and are connected to the tube wall of the inner sheath tube;

[0013] The chamber is also provided with an adjusting mechanism located above the metal stent. The outer sheath tube moves relative to the inner sheath tube, thereby driving the adjusting mechanism to control the expansion or contraction of the metal stent.

[0014] Compared with the prior art, the advantages of the present invention are:

[0015] 1. Through the relative sliding between the outer sheath and the inner sheath and the cooperation of the regulating mechanism in the chamber, the metal stent can be expanded or contracted in the blood vessel according to the needs of the operation, so that the metal stent is tightly pressed against the blood vessel when it is expanded, avoiding the outer sheath from being separated from the blood vessel during the operation, and thus facilitating the clinician to operate the guide wire for steering; and when the metal stent is contracted, it is no longer in contact with the blood vessel, so that the clinician can quickly withdraw the sheath from the blood vessel, thereby improving the efficiency of the operation;

[0016] 2. Through the meshing of the ratchet and the pawl, the outer sheath can only rotate in one direction relative to the inner sheath, thereby controlling the metal stent to be deployed step by step in the blood vessel to adapt to different blood vessel diameters and firmly fix the sheath in the blood vessel. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of an embodiment of a vascular puncture sheath that is easy to fix and turn according to the present invention;

[0018] Figure 2 It is a schematic diagram of deploying a metal stent in an embodiment of a vascular puncture sheath that is easy to fix and turn according to the present invention;

[0019] Figure 3 yes Figure 1 The forward structural diagram of

[0020] Figure 4 yes Figure 2 The forward structural diagram of

[0021] Figure 5 yes Figure 2 Structural cross-section diagram;

[0022] Figure 6 yes Figure 5 A magnified view of the structure of part A;

[0023] Figure 7 yes Figure 5 A magnified view of the structure of part B;

[0024] Figure 8 yes Figure 1 Bottom view of

[0025] Fig. 9 yes Figure 2 Bottom view of

[0026] Fig.10 It is a schematic diagram of the structural contraction of the metal stent of the present invention;

[0027] Fig.11 It is a schematic diagram of the structure expansion of the metal stent of the present invention;

[0028] Fig.12 yes Figure 1 A schematic cross-sectional view of the adjustment mechanism in use;

[0029] Fig.13 yes Figure 2 A schematic cross-sectional view of the adjustment mechanism in use;

[0030] Fig.14 yes Fig.13 Structural cross-sectional view of the regulating mechanism;

[0031] Fig.15 It is a simplified structural diagram of the elastic coating of the present invention;

[0032] Fig.16 It is a structural schematic diagram of a blood vessel puncture device of the present invention;

[0033] Fig.17 It is a structural schematic diagram of the puncture core rod of the present invention.

[0034] Description of reference numerals: 1 puncture seat, 101 handle portion, 102 liquid inlet tube, 2 inner sheath tube, 201 annular convex edge, 3 outer sheath tube, 301 through hole, 4 metal bracket, 401 memory metal wire, 5 chamber, 6 adjustment mechanism, 61 ratchet, 62 pawl, 7 elastic coating, 8 puncture core rod, 81 puncture rod, 82 holding handle. DETAILED DESCRIPTION

[0035] The present invention is described in detail below with reference to the accompanying drawings and embodiments:

[0036] like Figure 1-14 FIG. 1 is a schematic diagram of an embodiment of a vascular puncture sheath that is convenient for fixation and steering provided by the present invention:

[0037] A vascular puncture sheath convenient for fixation and steering, comprising:

[0038] Puncture seat 1;

[0039] The inner sheath tube 2 is connected to the lower end of the puncture seat 1;

[0040] The outer sheath tube 3 is movably sleeved on the outer side of the inner sheath tube 2;

[0041] A metal stent 4 is fixed to the lower end of the outer sheath tube 3 and is used to fix the outer sheath tube 3 in the blood vessel;

[0042] Among them, there is a longitudinally extending chamber 5 between the inner sheath tube 2 and the outer sheath tube 3, and a plurality of through holes 301 communicating with the chamber 5 are provided on the tube wall of the outer sheath tube 3, and the metal bracket 4 includes a plurality of memory metal wires 401, the lower ends of the memory metal wires 401 are fixed on the outer wall of the outer sheath tube 3, and the upper ends thereof penetrate into the chamber 5 through the corresponding through holes 301 and are connected to the tube wall of the inner sheath tube 2;

[0043] The chamber 5 is further provided with an adjustment mechanism 6 located above the metal stent 4 . The outer sheath tube 3 moves relative to the inner sheath tube 2 , thereby driving the adjustment mechanism 6 to control the metal stent 4 to expand or contract.

[0044] The outer sheath tube 3 can slide up and down and rotate circumferentially relative to the inner sheath tube 2 , and an annular convex edge 201 for preventing excessive sliding of the outer sheath tube 3 extends outward from the outer wall of the inner sheath tube 2 .

[0045] The upper end of the outer wall of the outer sheath tube 3 is surrounded by a circle of anti-skid patterns to increase friction and facilitate the rotation of the outer sheath tube 3 .

[0046] An elastic sealing ring is also provided on the upper end surface of the annular protrusion 201 to prevent blood from entering the chamber 5 .

[0047] The adjusting mechanism 6 comprises a ratchet 61 arranged on the outer wall of the inner sheath tube 2 and a ratchet 62 fixed on the inner wall of the outer sheath tube 3;

[0048] The pawl 62 can engage or disengage with the ratchet 61 as the outer sheath tube 3 slides up and down. When the pawl 62 engages with the ratchet 61, the outer sheath tube 3 can rotate unidirectionally relative to the inner sheath tube 2 to gradually unfold the metal bracket 4. When the pawl 62 disengages from the ratchet 61, the outer sheath tube 3 can rotate bidirectionally relative to the inner sheath tube 2 to reversely rotate and contract the metal bracket 4.

[0049] The ratchet 62 and the outer sheath tube 3 are integrally formed.

[0050] like Fig.14 As shown, the ratchet pawls 62 are provided in two pairs, and the two pairs of ratchet pawls 62 are respectively arranged on the upper and lower sides of the inner wall of the outer sheath tube 3 .

[0051] The ratchet 61 and the inner sheath tube 2 are integrally formed.

[0052] In certain embodiments, such as Fig.15 As shown, an elastic coating 7 is connected between the middle sections of each adjacent memory metal wire 401, and the elastic coating 7 can be deformed synergistically with the expansion or contraction of the metal bracket 4. The distance between the upper end of the memory metal wire 401 and the elastic coating 7 should not be less than the maximum distance that the outer sheath tube 3 slides up and down relative to the inner sheath tube 2, so that the upper end of the memory metal wire 401 can smoothly enter the chamber 5 through the through hole 301.

[0053] The through hole 301 and the memory metal wire 401 are clearance-matched, and a sealing process is performed between the through hole 301 and the memory metal wire 401 .

[0054] A plurality of memory metal wires 401 are arranged at intervals along the circumferential direction of the outer wall of the outer sheath tube 3 .

[0055] The initial shape of the memory wire 401 is relative to the outer sheath tube 3, such as Fig.11 As shown, the middle section is curved outwardly, and a plurality of memory metal wires 401 are arranged at intervals along the outer wall of the outer sheath tube 3 to form a flat disc-shaped metal bracket 4;

[0056] Before the outer sheath 3 is inserted into the patient's blood vessel, the ratchet 61 and the pawl 62 should be disengaged, and the outer sheath 3 should be rotated in the opposite direction relative to the unidirectional rotation direction of the ratchet 61 and the pawl 62, so that the memory wire 401 is spirally wound around the outer wall of the outer sheath 3. When the ratchet 61 and the pawl 62 are engaged and rotated unidirectionally, a number of memory wires 401 can be elastically restored to their initial shape step by step as the outer sheath 3 continuously rotates relative to the inner sheath 2, thereby gradually adjusting the degree of deployment of the metal stent 4 according to the blood vessel diameter of different patients.

[0057] A handle 101 for easy gripping is provided on the left outer wall of the puncture seat 1 , and a liquid inlet pipe 102 connected to the puncture seat 1 is provided on the right outer wall of the puncture seat 1 .

[0058] The liquid inlet tube 102 is connected to an external pipeline and is used to transport drugs (such as heparin and other anti-thrombotic drugs) into the inner sheath tube 2.

[0059] like Figure 16-17 FIG. 1 is a schematic diagram of an embodiment of a vascular puncture device of the present invention, which includes the above-mentioned vascular puncture sheath that is easy to fix and turn and a puncture core rod 8;

[0060] The puncture core rod 8 includes a longitudinally extending puncture rod 81 and a gripping handle 82 fixed to the upper end of the puncture rod 81. The puncture rod 81 penetrates from the upper end of the puncture seat 1 and passes out from the lower end of the inner sheath tube 2. The lower end of the puncture rod 81 is a conical structure. The puncture core rod 8 is provided with a longitudinally extending channel for accommodating the insertion of a guide wire.

[0061] The present invention provides a vascular puncture sheath that is easy to fix and turn and a puncture core rod that are used in combination as follows:

[0062] The clinician selects a suitable puncture point on the patient and optionally cuts the skin at the puncture point according to the actual situation, and then inserts the puncture sheath with the puncture core rod 8 and the guide wire into the blood vessel (at this time, if Fig.10 As shown, the metal stent 4 should be in a contracted state, each memory metal wire 401 is spirally wound on the outer wall of the outer sheath tube 3, and as shown in FIG. Fig.12 As shown, the ratchet 61 and the pawl 62 are in a disengaged state), under the guidance of the guide wire, the puncture core rod 8 and the puncture sheath smoothly enter the patient's blood vessel, and then withdraw the puncture core rod 8, and the clinician pushes the outer sheath tube 3 outside the patient's body, so that the outer sheath tube 3 slides downward relative to the inner sheath tube 2 (at this time, as shown in FIG. Fig.13 As shown, the ratchet 61 and the pawl 62 are in meshing state, and the outer sheath tube 3 can only rotate unidirectionally relative to the inner sheath tube 2). Then, by continuously rotating the outer sheath tube 3 in one direction, the memory metal wire 401 spirally wound on the outer wall of the outer sheath tube 3 is gradually elastically restored, thereby unfolding the metal stent 4 and pressing it against the inner wall of the patient's blood vessel, so as to achieve reliable fixation of the outer sheath tube 3 in the patient's blood vessel, so that the clinician can operate the guide wire in the lumen of the inner sheath tube 2 for steering or operate other surgical instruments for surgery. After the operation is completed, the clinician pulls the outer sheath tube 3 outside the patient's body, so that the outer sheath tube 3 slides upward relative to the inner sheath tube 2 (at this time, the ratchet 61 and the pawl 62 are disengaged, and the outer sheath tube 3 slides upward relative to the inner sheath tube 2). Tube 3 can rotate freely in a circular direction relative to the inner sheath tube 2), and then, relative to the unidirectional rotation direction of the ratchet 61 and the pawl 62, the outer sheath tube 3 is rotated in the opposite direction, so that the memory metal wire 401 is spirally wound around the outer wall of the outer sheath tube 3 again. At this time, the puncture sheath is withdrawn from the patient's body or the puncture sheath is pulled out until the bottom end of the puncture sheath is located at the puncture port, and the metal stent 4 is unfolded according to the above operation to fix the metal stent 4 at the puncture port, and the puncture sheath is fixed and remains in the blood vessel to avoid secondary puncture of the puncture sheath, and then the guide wire is inserted and extended toward the other end of the blood vessel, and then the metal stent 4 is retracted to allow the puncture sheath to extend along the direction of the guide wire to facilitate surgery on the other end of the blood vessel.

[0063] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A vascular puncture sheath that is easy to fix and turn, characterized in that: It includes: Puncture seat (1); An inner sheath tube (2) is connected to the lower end of the puncture seat (1); An outer sheath tube (3) is movably sleeved on the outer side of the inner sheath tube (2); A metal stent (4) is fixedly mounted on the lower end of the outer sheath tube (3) and is used to fix the outer sheath tube (3) in the blood vessel; There is a longitudinally extending chamber (5) between the inner sheath tube (2) and the outer sheath tube (3), a plurality of through holes (301) communicating with the chamber (5) are provided on the tube wall of the outer sheath tube (3), and the metal support (4) comprises a plurality of memory metal wires (401), the lower ends of the memory metal wires (401) are fixed on the outer wall of the outer sheath tube (3), and the upper ends thereof penetrate into the chamber (5) through the corresponding through holes (301) and are connected to the tube wall of the inner sheath tube (2); The chamber (5) is also provided with an adjustment mechanism (6) located above the metal stent (4); the outer sheath tube (3) moves relative to the inner sheath tube (2), thereby driving the adjustment mechanism (6) to control the expansion or contraction of the metal stent (4).

2. The vascular puncture sheath that is easy to fix and turn according to claim 1, characterized in that: The outer sheath tube (3) can slide up and down and rotate circumferentially relative to the inner sheath tube (2), and an annular convex edge (201) is extended outwardly from the outer wall of the inner sheath tube (2) to prevent the outer sheath tube (3) from excessively sliding.

3. The vascular puncture sheath that is easy to fix and turn according to claim 2, characterized in that: The adjustment mechanism (6) comprises a ratchet (61) arranged on the outer wall of the inner sheath tube (2) and a ratchet claw (62) fixed on the inner wall of the outer sheath tube (3); The ratchet pawl (62) can be engaged with or disengaged from the ratchet teeth (61) as the outer sheath tube (3) slides up and down. When the ratchet pawl (62) is engaged with the ratchet teeth (61), the outer sheath tube (3) can rotate unidirectionally relative to the inner sheath tube (2) to gradually unfold the metal stent (4). When the ratchet pawl (62) is disengaged from the ratchet teeth (61), the outer sheath tube (3) can rotate bidirectionally relative to the inner sheath tube (2) to rotate in the opposite direction to contract the metal stent (4).

4. The vascular puncture sheath that is easy to fix and turn according to claim 1, characterized in that: An elastic coating (7) is connected between the middle sections of each adjacent memory metal wire (401).

5. The vascular puncture sheath that is easy to fix and turn according to claim 1, characterized in that: The through hole (301) and the memory metal wire (401) are clearance-matched.

6. The vascular puncture sheath that is easy to fix and turn according to claim 1, characterized in that: A plurality of memory metal wires (401) are arranged at intervals along the circumferential direction of the outer wall of the outer sheath tube (3).

7. The vascular puncture sheath that is easy to fix and turn according to claim 1, characterized in that: A handle portion (101) for easy gripping is provided on the left outer wall of the puncture seat (1), and a liquid inlet tube (102) in communication with the puncture seat (1) is provided on the right outer wall of the puncture seat (1).

8. A blood vessel puncture device, characterized in that: It comprises a vascular puncture sheath and a puncture core rod (8) that are easy to fix and turn as described in any one of claims 1 to 7; The puncture core rod (8) comprises a longitudinally extending puncture rod (81) and a gripping handle (82) fixedly mounted on the upper end of the puncture rod (81); the puncture rod (81) penetrates from the upper end of the puncture seat (1) and passes out from the lower end of the inner sheath tube (2); the lower end of the puncture rod (81) is a conical structure; the puncture core rod (8) is provided with a longitudinally extending channel for accommodating the penetration of a guide wire.

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