Tunnel puncture outfit and medical instrument for subcutaneous puncture

Abstract

The utility model discloses a tunnel puncture outfit and a medical instrument used for subcutaneous puncture, the tunnel puncture outfit is the medical instrument suitable for subcutaneous puncture, the tunnel puncture outfit comprises a handle used for being held by hand; the puncture head is used for penetrating into the subcutaneous part and penetrating out of the subcutaneous part; one end of the tunnel rod is connected with the handle, the other end of the tunnel rod is connected with the puncture head, the tunnel rod comprises a plurality of sections of connecting rods, and the wall thickness of at least one section of connecting rod is different from that of other connecting rods, so that the rigidity of the tunnel rod is different in the length direction. According to the tunnel puncture outfit and the medical instrument for subcutaneous puncture, gradient distribution of rigidity of the tunnel puncture outfit can be achieved, puncture strength and tissue protection are both considered, and the problem that a traditional single rigid rod is too rigid or too soft is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to subcutaneous puncture medical equipment technical field especially, a kind of tunnel puncture device and medical apparatus for subcutaneous puncture. BACKGROUND

[0002] In deep brain stimulation (DBS) surgery, electrode leads are implanted into the patient's head, while implantable pulse generators (IPGs) are usually placed in front of the chest, and the two are connected by extension leads. One end of the extension lead is connected to the electrode lead, and the other end is inserted into the IPG channel to form an electrical signal path through contact. During implantation, the extension lead or electrode lead needs to establish a tunnel under the skin first, and a tunnel puncture device is usually used to pre-tunnel, and a puncture cannula is left in the tunnel, and then the lead is pulled out along the cannula to complete the subcutaneous implantation.

[0003] However, due to differences in subcutaneous tissue structure and the curvature of the puncture path of different patients, the existing puncture device or tunnel device is usually a straight rigid structure, with no curvature in the initial state. Doctors need to manually bend it to fit the specific puncture path before use. However, due to the uniform thickness design of the traditional puncture rod, the overall stiffness is consistent, which may cause the following problems when bending:

[0004] (1) Difficulty bending: due to the large stiffness of the rod body, the doctor needs to exert a large force to bend it, which is inconvenient to operate.

[0005] (2) Inaccurate curvature control: it is difficult to accurately adjust the bending position and angle, which may cause the actual puncture path to deviate from the expected path.

[0006] (3) Repeated adjustment affects efficiency: if the bending curvature is not ideal, it needs to be adjusted several times, which prolongs the operation time.

[0007] In addition, after bending the existing puncture device, due to uneven stiffness distribution, local stress concentration may occur during puncture, increasing the risk of tissue damage. Although a PP (polypropylene) tube is usually used to reduce tissue friction during puncture, the traditional puncture rod with uniform stiffness may still affect the puncture smoothness due to improper bending.

[0008] To solve at least one of the above technical problems, the utility model provides a tunnel puncture device and medical apparatus for subcutaneous puncture. UTILITY MODEL CONTENT

[0009] The utility model aims to provide a tunnel puncture device and medical apparatus for subcutaneous puncture, which can realize gradient distribution of the rigidity of the tunnel puncture device, balance the puncture force and tissue protection, and avoid the problem of over-rigid or over-flexible traditional single rigid rod.

[0010] The utility model achieves the above-mentioned technical effects by adopting the following technical solutions:

[0011] In one aspect, the utility model provides a tunnel puncture ware, be applicable to the medical equipment of subcutaneous puncture, the tunnel puncture ware includes:

[0012] Handle, the handle is used for hand holding;

[0013] Puncture head, the puncture head is used for entering into subcutaneous and from subcutaneous and go out;

[0014] Tunnel rod, one end of the tunnel rod is connected the handle, the other end of the tunnel rod is connected the puncture head, the tunnel rod includes multiple connecting rods, wherein the wall thickness of at least one connecting rod is different from the wall thickness of other connecting rods, so that the rigidity of the tunnel rod is different along the length direction.

[0015] The beneficial effects of the above scheme are that the utility model is adapted to the non-uniform characteristics of subcutaneous tissue, the part with stronger rigidity provides puncture support force, and the part with weaker rigidity improves flexibility and reduces damage to the tissue. In addition, by improving the wall thickness of each connecting rod, the gradient distribution of the rigidity of the tunnel puncture ware is realized, the puncture force and tissue protection are considered, the problem of over-rigidity or over-flexibility of the traditional single rigid rod is avoided, the operation difficulty of the doctor is reduced, and the accuracy of the operation is improved.

[0016] Further, the connecting rod includes first connecting rods and second connecting rods arranged alternately, the wall thickness of each second connecting rod is the same or different, the wall thickness of each first connecting rod is the same or different, and the wall thickness of the first connecting rod is greater than that of the second connecting rod.

[0017] The beneficial effects of the above scheme are that the utility model forms a rigidity gradient by alternately arranging the first connecting rods and the second connecting rods, and further optimizes the stress distribution. Specifically, by adjusting the wall thickness of the first connecting rods and the second connecting rods, the local bending resistance and bending adaptability are enhanced, and a rigidity distribution (such as increasing or decreasing rigidity at the proximal end) that meets the operation requirements can be obtained.

[0018] Further, the tunnel rod includes first and second ends arranged oppositely, the first end is connected to the handle, the second end is detachably connected to the puncture head, and the connecting rods connecting the first end and the second end are all first connecting rods.

[0019] The beneficial effects of the above scheme are that the utility model sets the detachable puncture head, which facilitates replacement of puncture heads of different specifications to meet different operation requirements or disinfection and maintenance. In addition, the utility model uses the first connecting rods with large diameters at both ends to ensure the stability of the connection with the handle and the puncture head, and at the same time avoid the risk of fracture caused by stress concentration.

[0020] Further, from the second end to the first end, the wall thickness of the second connecting rod near the first end is greater than or equal to the wall thickness of the second connecting rod near the second end.

[0021] The beneficial effect of the above scheme is that the wall thickness of the second connecting rod near the handle end is greater than or equal to the wall thickness of the second connecting rod far from the handle end, forming a rigid gradient decrease, which meets the bending requirement of shallow to deep during puncture.

[0022] Further, the lengths of the second connecting rods are the same or different, the lengths of the first connecting rods are the same or different, and the length of the second connecting rod is less than the length of the first connecting rod.

[0023] The beneficial effect of the above scheme is that the length of the connecting rod is further optimized to optimize the flexibility of the tunnel rod. For example, short first connecting rods and long second connecting rods increase local flexibility; long first connecting rods and short second connecting rods maintain overall coherence. In addition, by setting short second connecting rods and long first connecting rods, an alternating structure of rigid nodes and flexible short sections is formed, which enhances the segmented deformation capability of the rod body when bending and reduces tissue damage.

[0024] Further, from the second end to the first end, the length of the first connecting rod near the first end is greater than or equal to the length of the first connecting rod near the second end.

[0025] The beneficial effect of the above scheme is that the first connecting rod near the handle end is longer, gradually enhancing the overall rigidity, and matching the requirement that the handle side needs to bear greater operating force during the puncture process.

[0026] Further, the second connecting rod comprises:

[0027] The connecting rod body is provided with a first connecting terminal and a second connecting terminal at both ends, respectively, the first connecting terminal and the second connecting terminal are both circular truncated cone structures, the upper platform of the circular truncated cone structure is connected to the connecting rod body, and the lower platform of the circular truncated cone structure is connected to the first connecting rod.

[0028] Further, the first connecting terminal and the second connecting terminal are both symmetrically arranged circular truncated cone structures, the diameter of the upper platform of the circular truncated cone structure is equal to the outer diameter of the connecting rod body, and the diameter of the lower platform of the circular truncated cone structure is equal to the outer diameter of the first connecting rod.

[0029] The beneficial effect of the above scheme is that the connecting terminal of the circular truncated cone structure realizes smooth transition and reduces stress concentration at the diameter mutation. In addition, the symmetric first connecting terminal and the second connecting terminal ensure the stability of the connection and avoid twisting deviation.

[0030] The utility model provides a kind of medical apparatus for subcutaneous puncture, comprising:

[0031] The tunnel puncture device, one side of the puncture head of the tunnel puncture device is a conical structure, and the other side of the puncture head is detachably connected to the tunnel rod.

[0032] An outer sleeve is provided on the tunnel rod of the tunnel puncture device.

[0033] The utility model has the beneficial effects that the conical puncture head reduces the resistance to entering the skin, and the detachable connection facilitates assembly with the tunnel rod. In addition, the outer sleeve protects the tunnel rod and isolates the tissue, reducing the risk of infection.

[0034] Further, the outer diameter of the puncture head is greater than the outer diameter of the tunnel rod, the puncture head is detachably connected to the second end of the tunnel rod, and a limiting platform is formed at the connection;

[0035] The medical apparatus for subcutaneous puncture further comprises:

[0036] A limiting body is provided at the first end opposite to the second end of the tunnel rod.

[0037] The utility model has the beneficial effects that the limiting body and the limiting platform of the puncture head prevent the outer sleeve from slipping off and accurately position the puncture depth.

[0038] Compared with the prior art, the utility model has at least the following beneficial effects:

[0039] The utility model improves the wall thickness of each joint rod to achieve a gradient distribution of the rigidity of the tunnel puncture device, taking into account the puncture force and tissue protection, avoiding the problem of excessive rigidity or softness of traditional single rigid rods, reducing the difficulty of operation for doctors, and improving the accuracy of surgery. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 is a structural schematic diagram of the tunnel puncture device of the utility model embodiment.

[0041] Figure 2 is a structural schematic diagram of the medical apparatus for subcutaneous puncture of the utility model embodiment.

[0042] Figure 3 is a structural schematic diagram of the outer sleeve of the utility model embodiment.

[0043] In the figure: 1, tunnel puncture device; 11, puncture head; 111, conical structure; 112, connecting port; 113, limiting table; 12, tunnel rod; 1202, first end; 1201, second end; 121, first connecting rod; 122, second connecting rod; 1221, connecting rod body; 1222, second connecting terminal; 1223, first connecting terminal; 13, handle; 14, limiting body; 2, outer sleeve; 3, subcutaneous puncture medical device. DETAILED DESCRIPTION

[0044] Example embodiments now will be described more fully hereinafter with reference to the accompanying drawings; however, the example embodiments can be implemented in many different forms and should not be construed as limited to the implementations set forth herein; rather, these implementations are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the example embodiments to those skilled in the art. Like reference numerals refer to like elements throughout the several views and the description of the figures.

[0045] The words expressing position and direction described in the present application are explained by taking the drawings as an example, but changes can also be made as needed, and the changes made are included in the protection scope of the present application.

[0046] Next, first, one of the application fields of the present application embodiment (i.e. implantable device) will be briefly described. The implantable nerve stimulation system (an implantable medical system) mainly includes: a stimulator implanted in the patient's body and a programming device arranged outside the patient's body. The existing nerve regulation technology mainly implants electrodes in the body through stereotactic surgery at a specific structure (i.e. target point), and the stimulator implanted in the patient's body sends an electrical pulse width to the target point through the electrode, regulates the electrical activity and function of the corresponding nerve structure and network, and thus improves the symptoms and relieves the pain. Among them, the stimulator can be any one of an implantable nerve electrical stimulation device, an implantable cardiac electrical stimulation system (also known as a cardiac pacemaker), an implantable drug delivery device (Implantable Drug Delivery System, abbreviated as IDDS) and a lead adapter device. The implantable nerve electrical stimulation device is, for example: a deep brain electrical stimulation system (Deep Brain Stimulation, abbreviated as DBS), an implantable brain cortex stimulation system (Cortical Nerve Stimulation, abbreviated as CNS), an implantable spinal cord electrical stimulation system (Spinal Cord Stimulation, abbreviated as SCS), an implantable sacral nerve electrical stimulation system (Sacral Nerve Stimulation, abbreviated as SNS), an implantable vagus nerve electrical stimulation system (Vagus Nerve Stimulation, abbreviated as VNS), etc.

[0047] In some embodiments, the stimulator can include an implantable pulse generator (IPG), an electrode lead, and an extension lead disposed between the IPG and the electrode lead, through which data interaction between the IPG and the electrode lead is achieved, the IPG being disposed in the patient's body. In response to the programming instructions sent by the programming device, controllable electrical stimulation energy is provided to the in-vivo tissue by means of a sealed battery and circuitry, and one or two controllable specific electrical stimulation signals are delivered to a specific region of the in-vivo tissue through the implanted extension lead and the electrode lead. The extension lead is used in conjunction with the IPG as a transmission medium for the electrical stimulation signals generated by the IPG, and the electrical stimulation signals generated by the IPG are transmitted to the electrode lead. The electrode lead delivers electrical stimulation to a specific region of the in-vivo tissue through the electrode contacts thereon. The stimulator is provided with one or more electrode leads on one side or both sides, and a plurality of electrode contacts are disposed on the electrode leads.

[0048] In other embodiments, the stimulator can only include an IPG and an electrode lead. In this case, the IPG can be embedded on the patient's skull, and the electrode lead is implanted in the patient's skull, and the IPG is directly connected to the electrode lead without the need for an extension lead.

[0049] The electrode lead can be a neurostimulation electrode, and the electrode lead delivers electrical stimulation to a specific region of the in-vivo tissue through a plurality of electrode contacts. The stimulator is provided with one or more electrode leads on one side or both sides, and a plurality of electrode contacts are disposed on the electrode leads, which can be uniformly or non-uniformly arranged in the circumferential direction of the electrode lead. As an example, the electrode contacts can be arranged in a 4-row-by-3-column array (a total of 12 electrode contacts) in the circumferential direction of the electrode lead. The electrode contacts can include stimulation contacts and / or collection contacts. The electrode contacts can have a sheet shape, a ring shape, a dot shape, etc.

[0050] In some possible ways, the in-vivo tissue to be stimulated can be the patient's brain tissue, and the stimulated site can be a specific site of the brain tissue. When the patient's disease type is different, the stimulated site is generally different, and the number of stimulation contacts (single source or multiple sources) used, the use of one or more specific electrical stimulation signals (single channel or multiple channels), and the stimulation parameter data are also different. It can be considered that when the stimulation contacts used are multiple sources and multiple channels (multiple channels), a larger amount of data will be generated compared to single source and single channel.

[0051] The embodiment of the utility model is not limited to the disease type, which can be deep brain stimulation (DBS), spinal cord stimulation (SCS), pelvic stimulation, stomach stimulation, peripheral nerve stimulation, functional electrical stimulation, and the disease type of the application. Among them, the disease type that DBS can be used for treatment or management includes: but is not limited to: convulsive disease (for example: epilepsy), pain, migraine, mental illness (for example: major depressive disorder (MDD)), bipolar disorder, anxiety disorder, post-traumatic stress disorder, mild depression, obsessive-compulsive disorder (OCD), behavior disorder, emotional disorder, memory disorder, mental state disorder, movement disorder (for example: essential tremor or Parkinson's disease), Huntington's disease, Alzheimer's disease, drug addiction, autism or other neurological or psychiatric diseases and injuries.

[0052] The stimulation parameters can include one or more of the following: stimulation frequency (for example, the number of electrical stimulation pulse width signals per unit time 1s, unit Hz), pulse width (duration of each pulse width, unit us), current amplitude (generally expressed by voltage, that is, the intensity of each pulse width, unit V), timing (for example, it can be continuous or triggered), stimulation mode (including one or more of current mode, voltage mode, timing stimulation mode and cycle stimulation mode), doctor control upper and lower limit (range adjustable by the doctor) and patient control upper and lower limit (range adjustable by the patient).

[0053] In order to improve the problem that the tunnel puncture device 1 is difficult to bend and has large bending radius difference, the utility model introduces a tunnel puncture device 1 suitable for subcutaneous puncture.

[0054] The application is that the tunnel puncture device 1 can preset the bending radius, is convenient to adjust, has small puncture resistance, can improve the operation efficiency and reduce the operation difficulty.

[0055] The tunnel puncture device 1 of the utility model comprises: a handle 13, a puncture head 11 and a tunnel rod 12.

[0056] One end of the tunnel rod 12 is connected with the handle 13. In application, the handle 13 is an integral structure formed by the extension of the first end 1202 of the tunnel rod 12, which is used for the hand holding of medical staff in operation. Preferably, the handle 13 and the tunnel rod 12 are integrally injection molded by medical grade polycarbonate. In addition, the handle 13 can be annular or other shapes suitable for ergonomics, for example, a ring type shape, a pistol type shape and a palm support type shape, which is convenient for medical staff to hold in operation. In actual application, a limiting body 14 is arranged between the first end 1202 of the tunnel rod 12 and the handle 13 to limit the hand holding range of the hand of the medical staff, so as to avoid the pollution of the tunnel rod 12.

[0057] The other end of the tunnel rod 12 is connected with the puncture head 11, which is used to penetrate into and out of the subcutaneous tissue. In application, the second end 1201 of the tunnel rod 12 is detachably connected with the puncture head 11. Preferably, the puncture head 11 is threadedly connected with the second end 1201 of the tunnel rod 12, for example, by using M1.4 microthreads (thread pitch 0.35 mm), 2.5 turns can complete locking, and a conical sealing surface (angle 16°) is matched to prevent reverse infiltration of body fluids. In actual application, one side of the puncture head 11 is a conical structure 111, and the other side of the puncture head 11 is provided with an opening to form a connecting port 112, which is sleeved on the second end 1201 of the tunnel rod 12. The second end 1201 of the tunnel rod 12 is oppositely arranged with the first end 1202.

[0058] The tunnel rod 12 of the utility model comprises a plurality of connecting rods, at least one of which has a wall thickness different from that of the other connecting rods, so that the rigidity of the tunnel rod 12 is different along the length direction.

[0059] In application, the connecting rod between the first end 1202 and the second end 1201 of the tunnel rod 12 comprises first connecting rods 121 and second connecting rods 122 arranged alternately, and the connecting rod directly connecting the first end 1202 and the second end 1201 is the first connecting rod 121.

[0060] In some embodiments, the wall thickness of each second connecting rod 122 is the same or different, and the wall thickness of each first connecting rod 121 is the same or different.

[0061] In application, the wall thickness of the first connecting rod 121 is greater than that of the second connecting rod 122. Preferably, the outer diameter of the second connecting rod 122 is greater than 1.6 mm, and the outer diameter of the first connecting rod 121 is less than 3.2 mm.

[0062] The first connecting rod 121 is a high-rigidity section, which provides axial propulsion force conduction and prevents buckling instability. In addition, the first connecting rod 121 is made of medical 316L stainless steel, with a yield strength ≥690 MPa and a wall thickness ranging from 1.8 to 3.0 mm (preferably 2.2 mm). The second connecting rod 122 is a low-rigidity section, which realizes controllable bending deformation and has an energy absorption rate >85%. In addition, the second connecting rod 122 is made of nickel-titanium alloy, with a super-elasticity interval >7% strain and a wall thickness ranging from 0.9 to 1.6 mm (preferably 1.1 mm).

[0063] In actual application, from the second end 1201 to the first end 1202, the wall thickness of the second connecting rod 122 close to the first end 1202 is greater than or equal to that of the second connecting rod 122 close to the second end 1201.

[0064] For example, the tunnel rod 12 includes five connecting rods. From the first end 1202 to the second end 1201: the first section is the first connecting rod 121, the wall thickness is 3.0 mm, the bending stiffness is 3200 N·mm 2 , the deflection angle is 5°, and it is used as the force transmission core area of the handle 13; the second section is the second connecting rod 122, the wall thickness is 1.8 mm, the bending stiffness is 850 N·mm 2 , the deflection angle is 15°, and it is used as the primary bending buffer section; the third section is the first connecting rod 121, the wall thickness is 2.5 mm, the bending stiffness is 2200 N·mm 2 , the deflection angle is 10°, and it is used as the torque stable transition area; the fourth section is the second connecting rod 122, the wall thickness is 1.4 mm, the bending stiffness is 600 N·mm 2 , the deflection angle is 18°, and it is used as the terminal flexible adjustment section; and the fifth section is the first connecting rod 121, the wall thickness is 2.0 mm, the bending stiffness is 1500 N·mm 2 , the deflection angle is 12°, and it is used as the puncture head 11 connection reinforcement area.

[0065] In some embodiments, the lengths of the second connecting rods 122 are the same or different, and the lengths of the first connecting rods 121 are the same or different.

[0066] In application, the length of the second connecting rod 122 is less than the length of the first connecting rod 121. Preferably, the length of the second connecting rod 122 is less than half the length of the first connecting rod 121 adjacent thereto, and the length of the second connecting rod 122 is greater than one-third the length of the first connecting rod 121 adjacent thereto.

[0067] In actual application, from the second end 1201 to the first end 1202, the length of the first connecting rod 121 close to the first end 1202 is greater than or equal to the length of the first connecting rod 121 close to the second end 1201.

[0068] For example, the tunnel rod 12 includes five connecting rods. From the first end 1202 to the second end 1201: the first section is the first connecting rod 121, the length is 40 mm, and it is used as the force transmission core area of the handle 13; the second section is the second connecting rod 122, the length is 15 mm, and it is used as the primary bending buffer section; the third section is the first connecting rod 121, the length is 35 mm, and it is used as the torque stable transition area; the fourth section is the second connecting rod 122, the length is 12 mm, and it is used as the terminal flexible adjustment section; and the fifth section is the first connecting rod 121, the length is 30 mm, and it is used as the puncture head 11 connection reinforcement area. Among them, the first section has the longest length (40 mm), ensuring the stability of the operator holding; the fifth section is shortened by 14% compared with the third section, reducing the puncture resistance torque; the length ratio of the second section to the fourth section is 1.25:1, forming a bending curvature gradient.

[0069] The second connecting rod 122 comprises a connecting rod body 1221.

[0070] In application, the first connecting terminal 1223 and the second connecting terminal 1222 are both circular truncated cone structures, the upper truncated surface of the circular truncated cone structure is connected with the connecting rod body 1221, and the lower truncated surface of the circular truncated cone structure is connected with the first connecting rod 121.

[0071] In practical application, the first connecting terminal 1223 and the second connecting terminal 1222 are both symmetrically arranged circular truncated cone structures, the diameter of the upper truncated surface of the circular truncated cone structure is equal to the outer diameter of the connecting rod body 1221, and the diameter of the lower truncated surface of the circular truncated cone structure is equal to the outer diameter of the first connecting rod 121.

[0072] Preferably, the taper angle of the circular truncated cone structure is about 15°±0.5°, so that the stress transmission efficiency can be optimized; and the transition round angle is R0.1mm, so that the stress concentration coefficient can be reduced to below 1.2.

[0073] On the other hand, the utility model introduces a kind of medical apparatus 3 for subcutaneous puncture.

[0074] The utility model is used for subcutaneous puncture medical apparatus 3 includes: above-mentioned tunnel puncture ware 1 and outer sleeve tube 2.

[0075] In application, the inner diameter of the puncture head 11 is greater than or equal to the outer diameter of the tunnel rod 12, the puncture head 11 is detachably connected with the second end 1201 of the tunnel rod 12 opposite to the first end 1202, and a limiting platform 113 is formed at the connecting position.

[0076] In practical application, the outer sleeve tube 2 is sleeved on the tunnel rod 12 of the tunnel puncture ware 1, one end of the outer sleeve tube 2 is connected with the limiting body 14, and the other end of the outer sleeve tube 2 is connected with the limiting platform 113. Preferably, the outer sleeve tube 2 is a transparent PP tube outer sleeve tube 2.

[0077] In operation, the transparent PP material outer sleeve tube 2 (ID 3.1mm / OD 4.2mm) is sleeved on the tunnel rod 12 of the tunnel puncture ware 1, the limiting body 14 (height 1.2mm) forms mechanical stopper and is connected with one end of the outer sleeve tube 2, and the limiting platform 113 (taper angle 60°) of the puncture head 11 forms mechanical stopper and is connected with the other end of the outer sleeve tube 2. The operator holds the ergonomic handle 13, so that the puncture head 11 (OD 4.0mm) is inserted into subcutaneous tissue layer at an angle of 30-45° through the first skin incision (about 5mm). The handle 13 is rotated through real-time torque feedback (0.3-0.5N·m), and the gradient rigidity characteristics (stiffness range 600-3200N·mm 2) precisely adjust the puncture path so that the puncture head 11 exits from the second incision (distance 50-150 mm). Rotate the handle 13 counterclockwise ≥ 2.5 turns (M1.4 thread standard) to release the mechanical locking of the puncture head 11 with the tunnel rod 12. Keep the outer sleeve 2 in place fixed, withdraw the tunnel puncture device 1 axially at a constant rate (2 mm / s), finally leaving the outer sleeve 2 subcutaneously to form a low-trauma channel (tissue compression ratio < 15%).

[0078] Although the embodiments of the utility model have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and cannot be understood as limiting the utility model, the ordinary skilled in the art can change, modify, replace and transform the above-mentioned embodiments within the scope of the utility model without departing from the principles and purposes of the utility model, all these changes should belong to the protection scope of the utility model claim.

Claims

1. A tunnel puncher characterized by, Medical equipment suitable for subcutaneous puncture, the tunnel puncture device comprises: a handle (13) for handheld; a puncture head for penetrating into and out of the subcutaneous; a tunnel rod (12) connected to the handle (13) at one end and connected to the puncture head at the other end, the tunnel rod (12) comprising a plurality of connecting rods, wherein the wall thickness of at least one connecting rod is different from that of the other connecting rods, so that the rigidity of the tunnel rod (12) is different along the length direction.

2. The tunneling device of claim 1, wherein, The connecting rods include first connecting rods (121) and second connecting rods (122) arranged alternately, the wall thickness of each second connecting rod (122) is the same or different, and the wall thickness of each first connecting rod (121) is the same or different; and the wall thickness of the first connecting rod (121) is greater than that of the second connecting rod (122).

3. The tunneling device of claim 2, wherein, The tunnel rod (12) includes oppositely arranged first end (1202) and second end (1201), the first end (1202) is connected to the handle (13), the second end (1201) is detachably connected to the puncture head, and the connecting rods connected to the first end (1202) and the second end (1201) are all first connecting rods (121).

4. The tunneling device of claim 3, wherein, From the second end (1201) to the first end (1202), the wall thickness of the second connecting rod (122) near the first end (1202) is greater than or equal to the wall thickness of the second connecting rod (122) near the second end (1201).

5. The tunneling device of claim 3, wherein, The length of each second connecting rod (122) is the same or different, the length of each first connecting rod (121) is the same or different, and the length of the second connecting rod (122) is less than that of the first connecting rod (121).

6. The tunneling device of claim 5, wherein, From the second end (1201) to the first end (1202), the length of the first connecting rod (121) near the first end (1202) is greater than or equal to the length of the first connecting rod (121) near the second end (1201).

7. The tunneling device of claim 3, wherein, The second connecting rod (122) comprises: a connecting rod body (1221) provided with a first connecting terminal (1223) and a second connecting terminal (1222) at both ends respectively, the first connecting terminal (1223) and the second connecting terminal (1222) are both circular truncated cone structures, the upper platform of the circular truncated cone structure is connected to the connecting rod body (1221), and the lower platform of the circular truncated cone structure is connected to the first connecting rod (121).

8. The tunneling device of claim 7, wherein, The first connecting terminal (1223) and the second connecting terminal (1222) are both symmetrically arranged circular truncated cone structures, the diameter of the upper platform of the circular truncated cone structure is equal to the outer diameter of the connecting rod body (1221), and the diameter of the lower platform of the circular truncated cone structure is equal to the outer diameter of the first connecting rod (121).

9. A medical device for subcutaneous puncture, characterized by, It comprises: The tunnel puncture device (1) of any one of claims 1 to 8, one side of the puncture head of the tunnel puncture device (1) is a conical structure (111), and the other side of the puncture head is detachably connected to the tunnel rod (12). An outer sleeve (2) is sleeved on the tunnel rod (12) of the tunnel puncture device (1).

10. The medical device for subcutaneous puncture according to claim 9, wherein The outer diameter of the puncture head is greater than the outer diameter of the tunnel rod (12), the puncture head is detachably connected to the second end (1201) of the tunnel rod (12), and a limiting table (113) is formed at the connection; The medical device (3) for subcutaneous puncture further comprises: A limiting body (14) is arranged at the first end (1202) opposite to the second end (1201) of the tunnel rod (12).

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