CN219557507U - Subcutaneous tunnel guide and assembly thereof - Google Patents

Abstract

The utility model discloses a subcutaneous tunnel guide and components thereof, and belongs to the field of medical appliances. The subcutaneous tunnel guide device comprises an arc-shaped guide needle and an outer sheath sleeved on the outer wall of the arc-shaped guide needle; the shape and the size of the outer sheath are matched with those of the outer wall of the arc-shaped guide needle; the outer wall of the arc-shaped guide needle is bent to form an arc-shaped structure; the needle head and the needle tail of the arc-shaped guide needle are both in an open structure; the inside of the needle body of the arc-shaped guide needle is hollow, and the diameter of the periphery of the inner wall of the needle body is larger than that of the periphery of the outer wall of the nerve block catheter; the outer sheath is of an arc tubular structure with the front end and the rear end open; the arc-shaped tubular structure is provided with a front section and a rear section; the front section and the rear section are connected to form an outer sheath. The subcutaneous tunnel guide can effectively avoid drainage effect caused by direct leading-out of the nerve blocking catheter from the skin outlet A, so that the nerve blocking agent for local anesthesia flows out of the body along the catheter, the risks of catheter escape and local infection can be reduced, and meanwhile, the damage to the catheter caused by needle tip puncture or accidental injury to operators can be well avoided.

Description

Subcutaneous tunnel guide and assembly thereof

Technical Field

The utility model belongs to the field of medical instruments, and particularly relates to a subcutaneous tunnel guide and components thereof.

Background

Local anesthetics are injected around the nerve trunk, plexus and node to block impulse conduction, so that the innervated area generates anesthetic action, which is called nerve block. The nerve block can obtain a larger anesthetic region by only injecting one part. However, there is a possibility of serious complications, so that the operation must be familiar with the local anatomy, and the tissue through which the puncture needle passes, and the nearby blood vessels, organs, body cavities, and the like.

A nerve block catheter (hereinafter referred to as a catheter) is a device for local nerve block anesthesia or analgesia for a period of time (hours to days) for embedding near a target nerve for clinical anesthesia and pain treatment. Conventional catheter placement procedures include piercing the skin at one end of the target delivery zone with a needle to form a catheter exit port a, introducing the leading end of the catheter into the target tissue space, and leaving the trailing end of the catheter outside of the catheter exit port a. Generally, the catheter is placed in such a way, so that the liquid medicine (nerve retarder) in the tissue clearance can leak outwards along the wall of the catheter rapidly due to the drainage effect of the catheter, the treatment effect is seriously affected, and the risks of accidental removal of the catheter, local infection and the like are increased. The nerve block catheter passes through the skin after passing a certain distance under the skin, namely, the construction of the subcutaneous tunnel is a method for solving the problem of outward leakage, and the occurrence rate of clinical adverse events such as accidental removal of the catheter, local infection and the like can be reduced by the subcutaneous tunnel.

There is no clinically specific tool available for establishing such a catheter subcutaneous tunnel, and the usual procedures in the clinic are at present: the catheter was reversely penetrated by a 20ml syringe needle through the catheter exit port B (the position of the catheter at which the tail end of the catheter is percutaneous) to guide the catheter to establish the subcutaneous tunnel. The method has the defects of difficult operation, easy accidental injury of the catheter and medical staff by the sharp tool, shorter and smaller subcutaneous tunnel, superficial surface and the like.

Therefore, there is a need in the art to develop a special tool for subcutaneous tunnel guide that can guide the catheter to travel subcutaneously from the catheter exit a to the catheter exit B in a forward direction, so that the occurrence of clinically relevant adverse events can be effectively avoided, and the medical safety can be improved.

Disclosure of Invention

The utility model provides a subcutaneous tunnel guide with a brand new structure, which aims to solve the technical problems that the traditional puncture needle is easy to puncture and damage a nerve blocking catheter and is easy to accidentally injure medical staff in the reverse puncture process.

The technical scheme of the utility model is as follows:

the subcutaneous tunnel guide device is characterized by comprising an arc-shaped guide needle and an outer sheath sleeved on the outer wall of the arc-shaped guide needle; the shape and the size of the outer sheath are matched with those of the outer wall of the arc-shaped guide needle;

the outer wall of the arc-shaped guide needle is bent to form an arc-shaped structure;

the needle head and the needle tail of the arc-shaped guide needle are both in an open structure; the inside of the needle body of the arc-shaped guide needle is hollow, and the diameter of the periphery of the inner wall of the needle body is larger than that of the periphery of the outer wall of the nerve block catheter;

the outer sheath is of an arc tubular structure with the front end and the rear end open; the arc-shaped tubular structure is provided with a front section and a rear section; the front section and the rear section are connected to form an outer sheath.

The arc-shaped guide needle is used for facilitating forward puncture to enable the nerve block catheter to be used as a subcutaneous tunnel. The general use scene is that after the puncture is carried out on the target administration area by using a straight needle to form the skin outlet A, the nerve blocking catheter exposed outside is clamped at the catheter clamping position of the outer sheath of the subcutaneous tunnel guide, and the subcutaneous tunnel is made from the skin outlet A after the nerve blocking catheter is placed. The back section of the sheath of the subcutaneous tunnel guide is pulled out, the arc guide needle head enters from the skin outlet A and extends to be used under the skin, and the guide needle head is operated by medical staff to run under the skin. After the guiding needle enters the skin at a certain depth through the skin outlet A, the nerve blocking catheter can be peeled off from the clamping position, the front section of the sheath of the subcutaneous tunnel guide is pulled out along the tail end of the guiding needle, the guiding needle is pushed continuously along the original puncture direction, and the guiding needle is penetrated out from the skin outlet B to a proper distance. The guide needle can be sleeved in the rear section of the outer sheath of the subcutaneous tunnel guide device from the needle tip part of the guide needle after penetrating out from the skin outlet B, so that the safety protection effect is achieved. The guide nerve block catheter tail is inserted from the guide needle tail and exits from the guide needle head. At this time, the guiding needle is pulled away along the tail end of the nerve block catheter along the insertion direction, and the subcutaneous tunnel of the nerve block catheter can be formed. The method is also suitable for the catheters with the tube diameters similar to those of nerve block catheters, such as epidural catheters and the like, and is used for establishing subcutaneous tunnels. Since the catheter is placed using a special nerve block puncture needle and a straight needle is necessary, the skin outlet a cannot be formed by directly puncturing with an arc-shaped guide needle.

The front section and the rear section of the outer sheath are connected in a clamping way;

preferably, a clamping groove is radially formed in the outer wall of the tail periphery of the front section of the arc-shaped tubular structure;

a clamping block radially extends out of the outer wall of the periphery of the head of the rear section of the arc-shaped tubular structure;

preferably, the shape and the size of the clamping groove are matched with those of the clamping block.

The number of the clamping grooves and the clamping blocks is 1-4;

preferably, the number of the clamping grooves and the clamping blocks is 2, and the clamping grooves and the clamping blocks are uniformly distributed on the outer wall of the arc-shaped tubular structure.

A clamping structure is arranged on the outer wall of the outer sheath close to the front end of the front section along the axial direction; the setting of screens structure is in order to block the pipe front end, and screens structure is part of the sheath, with the pipe card in this position (play skin mouth A) of sheath, makes the arc guide needle when penetrating pipe play skin mouth A, and the pipe is at the dorsal part of its puncture route, produces the effect of avoiding the accidental injury pipe.

Preferably, the clamping structure comprises 2 outward bulges extending radially;

preferably, the top surfaces of the outer walls opposite to the 2 outward bulges are convex cambered surfaces; the clamping structure formed by the 2 outward bulges plays a role in protecting the catheter when the guide needle penetrates into the catheter skin outlet A, so that the 2 outward bulges form a similar semi-surrounding structure, the catheter is clamped in the middle of the 2 outward bulges, and the catheter can be stripped from the semi-surrounding structure due to certain toughness or flexibility of the sheath material.

Preferably, the apex spacing of the 2 outwardly convex cambered surfaces is 0.5-0.8mm, preferably 0.6mm;

preferably, the 2 outward protrusions have a radial length of 4-6mm, preferably 5mm;

preferably, the 2 outward protrusions have elasticity; when the space opposite to the 2 outward bulges generates pressure to cause the inward elastic rheology of the bulges, the vertex spacing of the outward cambered surfaces of the 2 outward bulges is 1.5-2.0mm, preferably 1.6mm;

preferably, the outer protrusion is made of silica gel or rubber.

Preferably, the radians of the front and rear sections of the sheath are 1.565-1.575rad, preferably 1.57rad, respectively;

preferably, the arc of the arcuate introducer needle is 3.13-3.15rad, preferably 3.14rad;

preferably, the arc radius of the arc-shaped guide needle is 2.2-2.5cm, preferably 2.24cm;

preferably, the outer diameter of the shank of the arcuate guide needle is 2.5-2.8mm, preferably 2.6mm, and the inner diameter is 1.8-2.2mm, preferably 2mm.

The rear section of the outer sheath is provided with a hand-held part A;

preferably, the hand-held part A is positioned at the middle rear part of the rear section of the outer sheath, the inside of the hand-held part A is hollow, and the shape and the size of the inside are matched with the shape and the size of the needle body of the arc-shaped guide needle;

preferably, the outer wall of the middle part of the rear section of the outer sheath with the arc-shaped tubular structure of the handheld part A outwards forms an outwards convex cambered surface; the space formed by wrapping the convex cambered surface is an ellipsoid;

preferably, the ellipsoid has a major diameter of 0.8-1.2cm, preferably 1cm;

preferably, the shorter diameter of the ellipsoid is greater than the diameter of the arc-shaped tubular structure.

A hand-held part B is arranged at the front section of the outer sheath near the front end;

preferably, the outer wall of the front section of the outer sheath with the arc-shaped tubular structure of the handheld part B forms an outwards convex cambered surface; the space formed by wrapping the convex cambered surface is an ellipsoid;

preferably, the ellipsoid has a major diameter of 1-1.4cm, preferably 1.2cm;

preferably, the shorter diameter of the ellipsoid is greater than the diameter of the arc-shaped tubular structure.

The arc-shaped tubular structure is made of silica gel or rubber;

preferably, the inner diameter of the arc-shaped tubular structure is 2.5-2.8mm, preferably 2.6mm, corresponding to the outer diameter of the arc-shaped introducer needle.

The subcutaneous tunnel guide further comprises: a front end protective cap;

preferably, the inner diameter of the front end protective cap is the short diameter of the ellipsoid of the handheld part B at the front section of the outer sheath, the inner diameter is 0.6-0.9cm, preferably 0.8cm, and the length is 1.4cm-2cm, preferably 1.7cm;

preferably, the front end protective cap is a cylinder with one end open and one end closed;

preferably, the front end protective cap is made of plastic.

The front end protective cap can be sleeved into the handheld part B through the front end and is tightly attached to the ellipsoid of the handheld part B, so as to protect the front end of the outer sheath of the subcutaneous tunnel guide.

A subcutaneous tunnel assembly, comprising: the subcutaneous tunnel guide, the nerve block catheter and the nerve block puncture needle.

The nerve block catheter (catheter) is an administration catheter guided by a nerve block puncture needle and is placed around nerve tissue of a target administration area through skin for continuously applying local anesthetic drugs to enable nerves to continuously generate a blocking effect. The skin outlet A is the skin puncturing opening of the nerve block puncture needle, after the nerve block puncture needle of the front end of the catheter passing through the skin outlet A is placed, the puncture needle is pulled out (withdrawn from the tail end of the catheter), and the skin outlet A only remains the tail end of the nerve block catheter.

The outer sheath which is wrapped by the arc-shaped guide needle needs to be used as a subcutaneous tunnel guide device to approach, and the needle head of the arc-shaped guide needle is used for entering from the skin outlet A through manual operation of medical staff; when the catheter is in, the front end of the catheter is clamped by a clamping structure at one side of the outer sheath; the medical staff slowly releases the arc-shaped guide needle forwards from the outer sheath and runs subcutaneously and passes out from the skin outlet B to form a subcutaneous tunnel.

At this time, the tail end of the catheter is inserted from the tail of the arc-shaped guide needle, passes through the needle body and the needle head of the arc-shaped guide needle and passes out from the skin outlet B, namely, the tail end of the catheter moves from the skin outlet A of the catheter to the skin outlet B of the catheter.

The curved introducer needle is then withdrawn from the catheter tail end, leaving only the catheter remaining subcutaneously. Medical staff holds the tail part of the catheter penetrating out of the catheter exit port B to adjust the embedding length of the subcutaneous catheter, and the front end of the catheter is pulled away from the catheter exit port A towards the direction of the catheter exit port B, namely, after a subcutaneous tunnel is established, the catheter exit port A cannot see the catheter, the catheter enters a subcutaneous region from the exit port A, and the exit port A is naturally closed. The tail part of the catheter is longer in the external part, so that the front end position of the catheter is unchanged in the operation process, and the catheter is always kept in a target administration area.

The utility model provides a subcutaneous tunnel guide with a brand new structure. When the subcutaneous tunnel guide is used, the front end of the outer sheath sleeved with the arc-shaped guide needle is placed at the catheter exit port A, the rear section of the outer sheath is removed (the tail part of the arc-shaped guide needle can be exposed at the moment), and the needle head of the arc-shaped guide needle is gradually pushed into the catheter exit port A to move subcutaneously until reaching the catheter exit port B and penetrating out of the skin.

And then the front section of the outer sheath which is still partially sleeved at the tail part of the arc-shaped guide needle is pulled out in the opposite direction of needle insertion, and when the outer sheath is pulled out, an operator can sleeve the rear section of the outer sheath which is pulled out before on the needle head part of the guide needle to prevent the operator from being accidentally injured. After the front section of the outer sheath is removed, only the arcuate guide needle remains under the skin.

At this point, the nerve block catheter may be inserted from the tail of the curved introducer needle and passed along the interior of the introducer needle to the catheter exit port B and out of the skin.

After the nerve block catheter is penetrated out of the guide needle, the guide needle sleeved outside the catheter can be pulled out along the needle inserting direction, and only the nerve block catheter is kept under the skin. The nerve blocking catheter enters from the catheter exit port A and passes out from the catheter exit port B to form a through subcutaneous tunnel, and the catheter passes through the subcutaneous tunnel, so that the drainage effect caused by the direct guiding of the nerve blocking catheter from the catheter exit port A can be effectively avoided, the local anesthetic nerve blocking agent can flow out of the body along the catheter, the risks of the catheter falling out and local infection can be reduced, and meanwhile, the damage to the catheter caused by the puncture of a needle point or the accidental injury to operators can be well avoided.

Drawings

Fig. 1 is a schematic structural view of a front section of an outer sheath and a rear section of the outer sheath of a subcutaneous tunnel guide according to 1 embodiment of the present utility model.

Fig. 2 is a schematic structural view of an outer sheath formed by clamping and combining an outer sheath front section and an outer sheath rear section of a subcutaneous tunnel guide according to another embodiment of the present utility model.

Fig. 3 is a schematic view of the structure of an arc-shaped guide needle of a subcutaneous tunnel guide according to 1 embodiment of the present utility model. The upper view is a schematic diagram of the front view structure of the arc-shaped guide needle, and the lower view is a schematic diagram of the top view structure of the arc-shaped guide needle.

Fig. 4 is a schematic diagram illustrating a first step in operation of the subcutaneous tunnel director according to another embodiment of the present utility model.

Fig. 5 is a schematic diagram illustrating the operation of the subcutaneous tunnel director according to the second embodiment of the present utility model.

Fig. 6 is a schematic diagram illustrating the operation of the subcutaneous tunnel director according to the third step in the operation of the subcutaneous tunnel director according to the embodiment of the present utility model.

Fig. 7 is a schematic diagram illustrating the operation of the subcutaneous tunnel director according to the fourth step in the operation of the subcutaneous tunnel director according to the embodiment of the present utility model.

Fig. 8 is a schematic diagram illustrating the operation of the subcutaneous tunnel director according to the fifth step in the operation of the subcutaneous tunnel director according to the embodiment of the present utility model.

Fig. 9 is a schematic diagram illustrating a sixth step in operation of the subcutaneous tunnel director according to the 1 embodiment of the present utility model.

Fig. 10 is a schematic diagram illustrating a seventh operation step of the subcutaneous tunnel director according to the embodiment of the present utility model.

Fig. 11 is a schematic diagram illustrating an eighth step of operation of the subcutaneous tunnel director according to the 1 embodiment of the present utility model.

Fig. 12 is a schematic diagram illustrating an operation of the subcutaneous tunnel director according to the ninth step in the operation of the subcutaneous tunnel director according to the 1 embodiment of the utility model.

Fig. 13 is a schematic view of the structure of the front section of the sheath of the subcutaneous tunnel guide according to another embodiment of the utility model.

The labels in the figures are listed below: 1-an arc-shaped guide needle, 11-a needle head and 12-a needle tail; 2-sheath, 21-front section of sheath, 211-clamping groove, 212-hand-held part B, 22-rear section of sheath, 221-clamping block, 222-hand-held part A, 23-clamping structure, 231-outwards bulge; 3-nerve block catheter, front end of 31-catheter, tail end of 32-catheter; 4-target administration area, 41-exit port A, 42-exit port B.

Detailed Description

The following describes the utility model in further detail with reference to specific examples and drawings, but is not intended to limit the scope of the utility model.

The term "catheter exit port" and "exit port" as used herein refer to a percutaneous port formed by a needle or introducer needle penetrating the skin, and are intended to have conventional technical meanings known to those of ordinary skill in the medical arts.

As used herein, "nerve block catheter" and "catheter" refer to devices for clinical anesthesia and pain management that are used to embed in the vicinity of the nerve in the targeted delivery area for local nerve block anesthesia or analgesia over a period of time (hours to days), as is well known to those of ordinary skill in the medical arts.

Group 1 embodiment, subcutaneous tunnel guide of the present utility model

The present set of embodiments provides a subcutaneous tunnel director. All embodiments of this group share the following common features: as shown in fig. 1 and 2, the subcutaneous tunnel guide comprises an arc-shaped guide needle 1 and an outer sheath 2 sleeved on the outer wall of the arc-shaped guide needle; the shape and the size of the outer sheath 2 are matched with those of the outer wall of the arc-shaped guide needle 1;

as shown in fig. 3, the outer wall of the arc-shaped guide needle 1 is bent to form an arc-shaped structure; the needle head 11 and the needle tail 12 of the arc-shaped guide needle 1 are both in an open structure; the inside of the needle body of the arc-shaped guide needle 1 is hollow, and the diameter of the periphery of the inner wall of the needle body is larger than that of the periphery of the outer wall of the nerve block catheter 3;

as shown in fig. 1 and 2, the outer sheath 2 has an arc-shaped tubular structure with open front and rear ends; the arc-shaped tubular structure is provided with a front section 21 and a rear section 22; the front section 21 is connected to the rear section 22 to form the outer sheath 2.

In some embodiments, the connection between the front section 21 and the rear section 22 of the sheath 2 is a clip connection;

preferably, the outer wall of the tail periphery of the front section 21 of the arc-shaped tubular structure is radially provided with a clamping groove 211;

a clamping block 221 radially extends from the outer wall of the head periphery of the rear section 22 of the arc-shaped tubular structure;

preferably, the shape and size of the clamping groove 211 are matched with those of the clamping block 221.

In a specific embodiment, the number of the clamping grooves 211 and the clamping blocks 221 is 1-4;

preferably, the number of the clamping grooves 211 and the clamping blocks 221 is 2 and the clamping grooves and the clamping blocks are uniformly distributed on the outer wall of the arc-shaped tubular structure.

In other embodiments, as shown in fig. 2, a detent structure 23 is provided on the outer wall of the outer sheath 2 near the front end of the outer sheath front section 21 in the axial direction;

in some embodiments, the detent structure 23 may be provided on the outer wall of the ellipsoid of the handpiece B, or may be provided at the front end closer to the front section 21 of the outer sheath 2.

In a preferred embodiment, the catch structure 23 is preferably provided at the front end of the sheath front section 21, as shown in fig. 13, which provides the advantage that: since the distal end 31 of the catheter 3 is already placed at the exit port a41 and the other part of the catheter 3 is passed out from the exit port a41 when the subcutaneous tunnel guide (outer sheath) is used, the catheter 3 needs to be locked on the back side of the puncture path of the arc-shaped guide needle 1 by the locking structure 23 of the outer sheath 2 in order to prevent the arc-shaped guide needle 1 from being damaged when it is introduced from the exit port a41.

Preferably, as shown in fig. 13, the detent structure 23 includes 2 radially extending outward protrusions 231;

preferably, the top surfaces of the outer walls opposite to the 2 outward bulges 231 are all convex cambered surfaces;

preferably, the apex pitch of the outwardly convex cambered surface of the 2 outward protrusions 231 is 0.5-0.8mm, preferably 0.6mm;

preferably, the radial length of the 2 outward protrusions 231 is 4-6mm, preferably 5mm;

preferably, the 2 outward protrusions 231 have elasticity; when the space opposite to the 2 outward bulges generates pressure to cause the inward elastic rheology of the bulges, the vertex spacing of the outward cambered surfaces of the 2 outward bulges is 1.5-2.0mm, preferably 1.6mm;

preferably, the outward bulge 231 is made of silica gel or rubber.

In some embodiments, the arc of the arcuate introducer needle 1 is 3.13-3.15rad, preferably 3.14rad;

preferably, the radians of the front section 21 and the rear section 22 of the sheath 2 are 1.565-1.575rad, preferably 1.57rad, respectively;

preferably, the arc radius of the arc-shaped guide needle 1 is 2.2-2.5cm, preferably 2.24cm;

the radius of the circle where the radian of the front section 21 and the rear section 22 of the outer sheath is consistent with the radius of the arc where the arc of the arc-shaped guide needle 1 is located.

Preferably, the outer diameter of the shank of the arcuate guide needle 1 is 2.5-2.8mm, preferably 2.6mm, and the inner diameter is 1.8-2.2mm, preferably 2mm.

In some specific embodiments, as shown in fig. 1 and 2, the sheath back section 22 is provided with a hand-held portion a222; the hand-held part A222 is positioned at the middle rear part of the rear section 22 of the outer sheath, the inside of the hand-held part A222 is hollow, and the shape and the size of the inside are matched with those of the needle body of the arc-shaped guide needle;

preferably, the outer wall of the middle part of the rear section of the sheath with the arc-shaped tubular structure of the handheld part A222 forms an outwards convex cambered surface outwards; the space formed by wrapping the convex cambered surface is an ellipsoid;

preferably, the ellipsoid has a major diameter of 0.8-1.2cm, preferably 1cm;

preferably, the shorter diameter of the ellipsoid is greater than the diameter of the arc-shaped tubular structure.

In some embodiments, the sheath front section 21 is provided with a grip B212 near the front end;

preferably, the outer wall of the front section of the outer sheath of the handheld part B212 with the arc-shaped tubular structure forms an outwards convex cambered surface outwards; the space formed by wrapping the convex cambered surface is an ellipsoid;

preferably, the ellipsoid has a major diameter of 1-1.4cm, preferably 1.2cm;

in some embodiments, as shown in fig. 1-2, the ellipsoidal size of the hand-held portion B212 can also be set smaller than the ellipsoidal size of the hand-held portion a 222.

Preferably, the shorter diameter of the ellipsoid is greater than the diameter of the arc-shaped tubular structure.

In a specific embodiment, the material of the arc-shaped tubular structure is silica gel or rubber;

preferably, the inner diameter of the arc-shaped tubular structure is 2.5-2.8mm, preferably 2.6mm, corresponding to the outer diameter of the arc-shaped introducer needle.

In a further embodiment, the subcutaneous tunnel director further comprises: a front end protective cap (not shown in the drawings);

preferably, the inner diameter of the front end protective cap is the short diameter of the ellipsoid of the hand-held part B212 of the front section 21 of the outer sheath 2, the inner diameter is 0.6-0.9cm, preferably 0.8cm, and the length is 1.4cm-2cm, preferably 1.7cm;

preferably, the front end protective cap is a cylinder with one end open and one end closed, and the inside of the cylinder is hollow;

in a specific embodiment, the shape and size of the hollow interior of the front end cap is adapted to the shape and size of the front end of the front section 21 of the outer sheath 2.

Preferably, the front end protective cap is made of plastic.

Group 2 embodiment subcutaneous tunnel assembly of the utility model

The present set of embodiments provides a subcutaneous tunnel assembly. All embodiments of this group share the following common features: the subcutaneous tunnel assembly includes: a subcutaneous tunnel guide, a nerve block catheter 3, and a nerve block puncture needle according to any of the embodiments of group 1.

The specific operation steps of the subcutaneous tunnel assembly of the utility model are as follows:

the first step: as shown in fig. 4, the tip 31 of the nerve block catheter (simply referred to as catheter) 3 is guided by a nerve block puncture needle (straight needle, not shown in the figure) and is placed percutaneously around the nerve tissue of the target administration area 4 to form a percutaneous port a41. Nerve block needles (straight needles) are needles commonly used in the art and are commercially available. The skin outlet a41 is the skin piercing opening of the nerve block puncture needle, and after the front end 31 of the catheter 3 is placed through the nerve block puncture needle of the skin outlet a41, the puncture needle is pulled out (withdrawn from the tail end of the catheter), and the skin outlet a only remains the nerve block catheter 3.

At this time, the outer sheath 2 surrounding the arc-shaped guide needle 1 with the subcutaneous tunnel guide is brought close, and the front end of the front section 21 of the outer sheath 2 is aligned with the exit port a41.

And a second step of: as shown in fig. 5, the needle head 11 of the arc-shaped guide needle 1 is manually operated by medical staff to enter from the skin outlet A41; when the catheter is accessed, the arc-shaped guide needle 1 needs to be manually operated, the rear section 22 of the outer sheath needs to be removed, and the clamping structure 23 on one side of the outer sheath 2 is used for clamping the front end 31 of the catheter 3.

And a third step of: as shown in fig. 6, the medical staff slowly releases the arc-shaped guide needle 1 forward from the outer sheath 2 and runs subcutaneously and out through the exit port B42 to form a subcutaneous tunnel.

Fourth, as shown in fig. 7, the removed rear section 22 of the outer sheath can be sleeved on the needle head 11 of the arc-shaped guide needle 1 extending out of the skin outlet B42, so as to avoid injuring operators accidentally.

Fifth, as shown in fig. 8, the tail end 32 of the catheter 3 is inserted from the tail 12 of the arc-shaped guide needle 1.

Sixth, as shown in fig. 9, the tail end 32 of the catheter 3 passes through the needle body and the needle head 11 of the arc-shaped guide needle 1 under the guidance of the arc-shaped guide needle 1, and passes out from the skin outlet B, that is, the tail end 32 of the catheter moves from the catheter skin outlet a41 to the catheter skin outlet B42.

Seventh, as shown in fig. 10, the curved introducer needle 1 is then slowly withdrawn from the trailing end 32 of the catheter 3.

Eighth, as shown in fig. 11, only the catheter 3 remains subcutaneously.

Ninth, as shown in fig. 12, the medical staff holds the tail end 32 of the catheter 3 penetrating through the catheter exit port B42 again to adjust the embedding length of the subcutaneous catheter 3, and pulls the front end 31 of the catheter 3 away from the catheter exit port a41 toward the catheter exit port B42, that is, after the subcutaneous tunnel is established, the front end 31 of the catheter 3 is not seen by the catheter exit port a41, the catheter 3 enters the subcutaneous region from the exit port a41, and the exit port a41 is naturally closed. Since the trailing end 32 of the catheter 3 is longer in the extracorporeal portion, the position of the leading end 31 of the catheter 3 is unchanged during operation, and remains at the tissue space embedding position of the target delivery zone 4.

Claims (16)

1. The subcutaneous tunnel guide device is characterized by comprising an arc-shaped guide needle and an outer sheath sleeved on the outer wall of the arc-shaped guide needle; the shape and the size of the outer sheath are matched with those of the outer wall of the arc-shaped guide needle;

the outer wall of the arc-shaped guide needle is bent to form an arc-shaped structure;

the needle head and the needle tail of the arc-shaped guide needle are both in an open structure; the inside of the needle body of the arc-shaped guide needle is hollow, and the diameter of the periphery of the inner wall of the needle body is larger than that of the periphery of the outer wall of the nerve block catheter;

the outer sheath is of an arc tubular structure with the front end and the rear end open; the arc-shaped tubular structure is provided with a front section and a rear section; the front section and the rear section are connected to form an outer sheath.

2. The subcutaneous tunnel guide according to claim 1, wherein the connection of the anterior segment and the posterior segment of the sheath is a snap-fit;

and/or, the outer wall of the tail periphery of the front section of the arc-shaped tubular structure is radially provided with a clamping groove;

a clamping block radially extends out of the outer wall of the periphery of the head of the rear section of the arc-shaped tubular structure;

and/or the clamping groove is matched with the clamping block in shape and size.

3. The subcutaneous tunnel guide according to claim 2, wherein the number of the clamping grooves and clamping blocks is 1-4;

and/or the number of the clamping grooves and the clamping blocks is 2 and the clamping grooves and the clamping blocks are uniformly distributed on the outer wall of the arc-shaped tubular structure.

4. The subcutaneous tunnel guide according to claim 1 or 2, wherein a detent structure is provided on the outer wall of the outer sheath near the front end of the anterior segment in the axial direction;

and/or, the clamping structure comprises 2 outwards bulges extending radially;

and/or the top surfaces of the outer walls opposite to the 2 outward bulges are convex cambered surfaces;

and/or the vertex spacing of the 2 outwards-convex cambered surfaces is 0.5-0.8mm;

and/or 2 outward protrusions having a radial length of 4-6mm;

and/or, 2 outward protrusions have elasticity; when the space opposite to the 2 outward bulges generates pressure to cause the inward elastic rheology of the bulges, the vertex spacing of the outward cambered surfaces of the 2 outward bulges is 1.5-2.0mm;

and/or the outer bulge is made of silica gel or rubber.

5. The subcutaneous tunnel guide according to claim 4, wherein the apex pitch of the 2 outwardly convex cambered surfaces is 0.6mm;

and/or 2 outward protrusions having a radial length of 5mm;

and/or, the vertex spacing of the 2 outwards-convex cambered surfaces is 1.6mm.

6. The subcutaneous tunnel guide according to claim 1, wherein the arc of the arcuate guide needle is 3.13-3.15rad;

and/or the radians of the front section and the rear section of the outer sheath are respectively 1.565-1.575rad;

and/or the radius of the arc guide needle is 2.2-2.5cm;

and/or the outer diameter of the needle body of the arc-shaped guide needle is 2.5-2.8mm, and the inner diameter is 1.8-2.2mm.

7. The subcutaneous tunnel guide according to claim 6, wherein the arc of the arcuate guide needle is 3.14rad;

and/or, the radians of the front section and the rear section of the outer sheath are respectively 1.57rad;

and/or the radius of the arc where the arc of the arc-shaped guide needle is positioned is 2.24cm;

and/or the outer diameter of the needle body of the arc-shaped guide needle is 2.6mm, and the inner diameter is 2mm.

8. The subcutaneous tunnel guide according to claim 1 or 2, characterized in that the rear section of the outer sheath is provided with a hand-held portion a;

and/or the hand-held part A is positioned at the middle rear part of the rear section of the outer sheath, the inside of the hand-held part A is hollow, and the shape and the size of the inside are matched with the shape and the size of the needle body of the arc-shaped guide needle;

and/or, the outer wall of the middle part of the rear section of the outer sheath of the arc-shaped tubular structure of the handheld part A outwards forms an outwards convex cambered surface; the space formed by wrapping the convex cambered surface is an ellipsoid;

and/or, the length and diameter of the ellipsoid are 0.8-1.2cm;

and/or the short diameter of the ellipsoid is larger than the pipe diameter of the arc-shaped tubular structure.

9. The subcutaneous tunnel guide according to claim 8, wherein the ellipsoid has a major diameter of 1cm.

10. The subcutaneous tunnel guide according to claim 1 or 2, wherein the front section of the outer sheath is provided with a hand-held part B near the front end;

and/or, the outer wall of the front section of the outer sheath with the arc-shaped tubular structure of the handheld part B outwards forms an outwards convex cambered surface; the space formed by wrapping the convex cambered surface is an ellipsoid;

and/or, the length and diameter of the ellipsoid are 1-1.4cm;

and/or the short diameter of the ellipsoid is larger than the pipe diameter of the arc-shaped tubular structure.

11. The subcutaneous tunnel guide according to claim 10, wherein the ellipsoid has a major diameter of 1.2cm.

12. A subcutaneous tunnel guide according to any of claims 1-3, wherein the arcuate tubular structure is of silicone or rubber;

and/or the inner diameter of the arc-shaped tubular structure is 2.5-2.8mm, which is consistent with the outer diameter of the arc-shaped guide needle.

13. The subcutaneous tunnel guide according to claim 12, wherein the inner diameter of the arcuate tubular structure is 2.6mm.

14. The subcutaneous tunnel director of claim 12, further comprising: a front end protective cap;

and/or the inner diameter of the front end protective cap is the short diameter of the ellipsoid of the handheld part B at the front section of the outer sheath, the inner diameter is 0.6-0.9cm, preferably 0.8cm, and the length is 1.4cm-2cm, preferably 1.7cm;

and/or the front end protective cap is a cylinder with one end open and one end closed;

and/or the front end protective cap is made of plastic.

15. The subcutaneous tunnel guide according to claim 14, wherein the front end protective cap has an inner diameter of 0.8cm and a length of 1.7cm.

16. A subcutaneous tunnel assembly, comprising: the subcutaneous tunnel guide, nerve block catheter, and nerve block puncture needle of any one of claims 1-15.