A telescoping cardiac pacing electrode

Abstract

The present application relates to the technical field of cardiac pacing electrode, in particular to a telescopic cardiac pacing electrode, which comprises a pulse pacemaker and an electrode lead, the electrode lead comprises an insertion end, a connecting sleeve, a conductive core wire and an electrode end, the insertion end, the connecting sleeve and the electrode end are sequentially fixedly connected, the insertion end is insertedly matched with the pulse pacemaker, the connecting sleeve is internally provided with the conductive core wire, the two ends of the conductive core wire are respectively connected with the insertion end and the electrode end, and the pulse pacemaker generates a pulse electric signal which is transmitted to the inside of an organ through the electrode end; in the present application, the telescopic members and the fixing members are staggered in the subcutaneous section, the initial length is the shortest, the spacing of the fixing members anchored in the subcutaneous tissue is increased with the growth of the patient's trunk, the telescopic members are axially stretched, the length adjustment range covers the entire growth period from childhood to adulthood, the risk of electrode lead tightness, electrode displacement or breakage is fundamentally eliminated, and secondary surgery is avoided.

Description

Technical Field

[0001] This application relates to the field of cardiac pacing electrode technology, and in particular to a retractable cardiac pacing electrode. Background Technology

[0002] A pacemaker is generally an electronic therapeutic device that can be implanted into the body. The basic structure of a pacemaker includes a battery, a pulser, and electrode wires. Traditional cardiac pacing electrodes are implanted into the heart chamber via a vein, with the ends fixed to the endocardium via active coils or passive barbs. Leads are connected via subcutaneous tunnels to a pulse generator within the subclavian pocket. This pulser generates pulsed currents, which are conducted through the electrode wires implanted in the heart, blood vessels, and other tissues to stimulate affected organs, thereby treating functional disorders caused by abnormal heartbeats. Currently, most electrodes are relatively long and need to be wound around the pacemaker's pulse transmitter, increasing the risk of infection, leakage, bulging, and bleeding.

[0003] In the prior art, publication number CN103083808A provides a pacemaker electrode wire and a pacemaker. Specifically, the provided pacemaker electrode wire is made of a composite material of carbon nanotube wire and conductive wire core. Due to the good toughness and mechanical strength of the carbon nanotube wire itself, the electrode wire made of the composite material can still maintain good flexibility and mechanical strength at a small diameter, thereby improving the service life of the electrode wire and thus improving the service life of the pacemaker using the pacemaker.

[0004] While the existing technologies described above can connect to pacemakers, their electrode leads are typically rigid or fixed in length. The subcutaneous portion cannot extend or retract during use, making it difficult for the leads to adapt to patient growth and development. This leads to issues like tautness, breakage, or displacement, increasing the risk of secondary surgery. Secondly, although existing electrode leads are retractable, the subcutaneous tissue completely wraps around and fixes the outer side of the lead. As the patient grows, the outer side of the lead is easily stretched, leading to stress concentration and repeated bending, resulting in fatigue breakage. Therefore, there is room for improvement beyond existing retractable cardiac pacing electrodes. Summary of the Invention

[0005] To address the problems existing in the background art, the present invention proposes a retractable cardiac pacing electrode.

[0006] The retractable cardiac pacing electrode provided in this application adopts the following technical solution:

[0007] A retractable cardiac pacing electrode includes a pulse pacemaker and an electrode lead. The electrode lead includes an insertion end, a connecting sleeve, a conductive core wire, and an electrode end. The insertion end, connecting sleeve, and electrode end are sequentially and fixedly connected. The insertion end is inserted into the pulse pacemaker. The connecting sleeve drives the electrode end to be inserted into a biological organ. The connecting sleeve is a flexible hollow structure. A conductive core wire is disposed inside the connecting sleeve. The two ends of the conductive core wire are connected to the insertion end and the electrode end, respectively. The pulse pacemaker generates a pulse electrical signal, which is transmitted to the organ through the electrode end.

[0008] The connecting sleeve includes a subcutaneous segment and an intravenous segment. The subcutaneous segment is a flexible and stretchable structure that is embedded inside the skin and can adapt to body growth. The intravenous segment is a flexible but non-stretchable structure that extends through the vein into the biological organ. The conductive core wire located inside the subcutaneous segment is a stretchable structure.

[0009] The subcutaneous segment includes a connecting end, a telescopic component, and a fixing component. There are two connecting ends, and the telescopic component and the fixing component are evenly arranged between the two connecting ends. The telescopic component and the fixing component are arranged alternately, and the telescopic component can extend, retract, and bend.

[0010] Furthermore, the telescopic component has a cylindrical hollow structure, and sealing protrusions are fixedly installed at both ends of the telescopic component. The sealing protrusions have a conical structure.

[0011] Furthermore, the outer surface of the telescopic component is smooth, and an anti-cell adhesion layer is coated on the outer surface of the telescopic component.

[0012] Furthermore, the telescopic component has a corrugated structure, and both its inner and outer sides are provided with an elastically retractable protective layer.

[0013] Furthermore, the fixing member has a circular ring structure and is made of rigid biocompatible core material. The fixing member is used to lock and fix two adjacent telescopic members.

[0014] Furthermore, an annular groove is provided on the outer surface of the fixing member, and arc-shaped protrusions are evenly arranged on the annular groove.

[0015] Furthermore, a porous coating is arranged on the gap between two adjacent arc-shaped protrusions on the outer side of the fixing member. The porous coating is one of sintered titanium beads, porous titanium coating, or open-cell silicone.

[0016] Furthermore, the fixing member has annular grooves at both ends, an arc-shaped groove on the inner wall of the annular groove, a locking frame is fixedly installed in the arc-shaped groove, and a locking protrusion corresponding to the locking frame is fixedly installed at the end of the telescopic member.

[0017] Furthermore, the locking frame has an arc-shaped structure, with a mounting hole at one end and an arc-shaped opening at the other end. A sliding groove is provided in the middle of the locking frame, and the thickness of the inner side of the locking frame gradually increases in a clockwise direction. A positioning groove is provided on the inner side of the locking frame near the mounting hole.

[0018] Furthermore, the locking protrusion has a T-shaped structure and includes a connecting rod and a latch. The connecting rod is fixedly installed at the end of the sealing protrusion, and a latch is installed at the end of the connecting rod. The diameter of the latch is smaller than the arc-shaped opening and larger than the width of the sliding groove. The connecting rod can slide along the sliding groove. A positioning protrusion is fixedly installed on the latch. The surface of the positioning protrusion is a rough ground surface, and the positioning protrusion engages with the positioning groove.

[0019] Beneficial effects

[0020] Compared with the prior art, the present invention provides a retractable cardiac pacing electrode, which has the following beneficial effects:

[0021] 1. In this invention, the subcutaneous segment adopts an alternating layout of telescopic and fixed components, with the initial length being the shortest (suitable for children's body size). As the patient's torso grows, the spacing between the fixed components anchored to the subcutaneous tissue increases, and the telescopic components are pulled to extend axially. The length adjustment range covers the entire growth period from childhood to adulthood. The electrode does not need to be set too long initially, reducing the risk of infection leakage, bulging, bleeding, etc. It fundamentally eliminates the risk of electrode wire tautness, electrode displacement or breakage, and avoids secondary surgery.

[0022] 2. In this invention, the annular groove and porous coating design on the surface of the fixation component can promote the ingrowth of fibroblasts, so that the fixation component and the subcutaneous tissue form a permanent fibrous capsule, which has a strong anchoring effect and avoids the phenomenon of falling off. At the same time, the smooth outer surface design of the telescopic component allows the telescopic component to form a tissue tunnel under the skin, thereby avoiding the complete encapsulation of the subcutaneous electrode by the tissue. This makes it easier for the telescopic component to adapt to the growth of the patient's body and avoids the phenomenon of stress concentration of the electrode in the subcutaneous segment, repeated bending, and fatigue fracture.

[0023] 3. In this invention, the fixing component and the telescopic component are locked together by a locking bracket and a locking protrusion, which makes the installation and disassembly of the fixing component and the telescopic component simple, and makes it easy to increase or decrease the number of fixing components and telescopic components to suit patients of different ages; at the same time, the locking effect between the fixing component and the telescopic component is good, and no leakage will occur.

[0024] 4. In this invention, the conductive core wire adopts a spiral telescopic design, which prevents bending and metal lattice damage during extension, resulting in a small impedance change rate and ensuring the fidelity of pulse signal transmission. The core wire is covered with a biocompatible insulation layer and a shielding layer (silicone / polyurethane) to suppress electromyographic interference and improve the stability of the pacing threshold. Attached Figure Description

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] Figure 1 This is a three-dimensional structural diagram of this application.

[0027] Figure 2 This is a three-dimensional structural diagram of the pulse pacemaker and connecting cannula of this application.

[0028] Figure 3 This is a three-dimensional structural diagram of the insertion end and the connecting sleeve of this application.

[0029] Figure 4 This is a three-dimensional structural diagram of the insertion end, connecting sleeve and conductive core wire of this application.

[0030] Figure 5 This is a three-dimensional structural diagram of the telescopic component and the fixing component in this application.

[0031] Figure 6 This is a cross-sectional structural diagram of the telescopic component of this application.

[0032] Figure 7 This is a three-dimensional structural diagram of the telescopic component of this application.

[0033] Figure 8 This application Figure 7 A magnified structural diagram at point X in the middle.

[0034] Figure 9 This is a three-dimensional structural diagram of the fastener and locking bracket in this application.

[0035] Figure 10 This is a three-dimensional structural diagram of the locking frame of this application.

[0036] Explanation of reference numerals in the attached drawings: 1. Pulse pacemaker; 2. Electrode lead; 21. Insertion end; 22. Connecting sleeve; 220. Sealing protrusion; 221. Connecting end; 222. Telescopic component; 2221. Locking protrusion; 2222. Connecting rod; 2223. Lock; 2224. Positioning protrusion; 223. Fixing component; 2231. Locking bracket; 2232. Mounting hole; 2233. Arc-shaped opening; 2234. Sliding groove; 2235. Positioning groove; 23. Conductive core wire; 24. Electrode end. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Please see Figure 1-10 The present invention provides a retractable cardiac pacing electrode, comprising: a pulse pacemaker 1 and an electrode lead 2. The electrode lead 2 includes an insertion end 21, a connecting sleeve 22, a conductive core wire 23, and an electrode end 24. The insertion end 21, the connecting sleeve 22, and the electrode end 24 are sequentially fixedly connected. The insertion end 21 is inserted into the pulse pacemaker 1. The connecting sleeve 22 drives the electrode end 24 to be inserted into the biological organ. The connecting sleeve 22 is a flexible hollow structure. The conductive core wire 23 is provided inside the connecting sleeve 22. The two ends of the conductive core wire 23 are respectively connected to the insertion end 21 and the electrode end 24. The pulse pacemaker 1 generates a pulse electrical signal that is transmitted to the organ through the electrode end 24.

[0039] In the above technical solution, the pulse pacemaker 1 includes a power supply and a control circuit (not shown in the figure). The control circuit can generate a pulse current, which is a rectangular pulse with a pulse width of 0.5-0.6ms. The insertion end 21 of the electrode wire 2 can be electrically connected to the control circuit, so that the pulse signal is transmitted to the electrode end 24 through the insertion end 21 and the conductive core wire 23. The electrode end 24 can be implanted inside biological organs (such as the heart, blood vessels, and other tissues).

[0040] See Figure 1 As shown, the electrode 24 has a cylindrical structure, with diagonal braces evenly arranged along its circumference. The diagonal braces are inclined, and the electrode 24 and the diagonal braces are made of biocompatible polymer material. The diagonal braces form a barbed structure on the outside of the electrode 24. When the electrode 24 is inserted into the biological organ, the barbed structure can prevent relative movement or detachment. A conductive end is also installed at the end of the electrode 24. The conductive end contacts the biological organ. When a pulse signal is generated inside the pulse pacemaker 1, the pulse signal is transmitted to the inside of the biological organ through the conductive end, stimulating the biological organ and thus treating certain functional disorders caused by abnormal electrical signals in the biological organ.

[0041] See Figures 1-2 As shown, the connecting sleeve 22 includes a subcutaneous segment and an intravenous segment. The subcutaneous segment is a flexible and stretchable structure that is embedded inside the skin and can adapt to body growth. The intravenous segment is a flexible but non-stretchable structure that extends through the vein into the biological organ. The conductive core wire 23 located inside the subcutaneous segment is a stretchable structure.

[0042] In the above technical solution, the subcutaneous segment is embedded in the subclavian subcutaneous pouch. When used on children or adolescents, the flexible and stretchable subcutaneous segment can automatically adjust the electrode length to adapt to the patient's growth and development, avoiding secondary surgery. At the same time, the stretchable structure eliminates redundant electrode length, reduces mechanical stress on the subcutaneous segment, and lowers the risk of complications. The intravenous segment is a non-stretchable structure, maintaining rigidity or moderate flexibility to ensure stable contact with biological organs.

[0043] See Figure 4 As shown, the telescopic structure of the conductive core wire 23 can be a spiral structure, which provides excellent tensile strength and fatigue resistance. That is, the conductive core wire 23 has sufficient redundant length inside the connecting sleeve 22, and will not be stretched or excessively bent, thus maintaining good electrical signal conduction. The conductive core wire 23 is covered with a flexible, biocompatible insulating layer (such as silicone or polyurethane) and a shielding layer.

[0044] See Figures 2-4 As shown, the subcutaneous segment includes a connecting end 221, a telescopic member 222, and a fixing member 223. There are two connecting ends 221, and the telescopic member 222 and the fixing member 223 are evenly arranged between the two connecting ends 221. The telescopic member 222 and the fixing member 223 are arranged alternately. The telescopic member 222 can be extended and bent.

[0045] In the above technical solution, the telescopic component 222 and the fixing component 223 are arranged alternately, and the number of telescopic components 222 exceeds that of the fixing component 223 by one. That is, the end of the telescopic component 222 is connected to the connecting end 221. When the subcutaneous segment is buried in the subclavian subcutaneous pouch, the fixing component 223 can be fixed to the patient's tissue, while the telescopic component 222 is not connected to the patient's tissue. When the patient's body grows, the telescopic component 222 can expand and contract synchronously with the body's growth. The telescopic component 222 is telescopic, so the electrode length does not need to be set too long initially, so that the electrode does not need to be wrapped around the pulse pacemaker 1, reducing the risk of external infection, bulging, bleeding, etc.

[0046] The subcutaneous segment is presented as follows: connecting end 221 - telescopic component 222 - fixing component 223 - telescopic component 222 - fixing component 223 - ... - telescopic component 222 - connecting end 221. When used for patients of different ages, the number of telescopic components 222 and fixing components 223 can be increased or decreased in order to accurately utilize the patient's body growth.

[0047] In the initial implantation state, all telescopic components 222 are in a free state, with the shortest total length of the subcutaneous segment to accommodate the smaller body size of children. As the child grows taller, the trunk skin and subcutaneous tissue are stretched, and the anchoring components 223 in the tissue are slowly pulled apart, increasing the distance between adjacent anchoring components 223. Pulling the ends of the telescopic components 222 increases the length of the telescopic components 222, thereby adapting to the patient's body growth, avoiding secondary surgery, and preventing the subcutaneous segment from rupturing due to body growth, ensuring the safety of use. The telescopic components 222 are fully or partially extended to reach the designed maximum length to accommodate adult body size, thus avoiding the phenomenon of stress concentration on the outside of the electrode wire due to complete wrapping of the subcutaneous segment, and preventing fatigue fracture of the electrode wire due to repeated bending.

[0048] See Figures 5-7 As shown, in this preferred embodiment, the telescopic member 222 has a cylindrical hollow structure, and sealing protrusions 220 are fixedly installed at both ends of the telescopic member 222. The sealing protrusions 220 have a conical structure.

[0049] In the above technical solution, the sealing protrusion 220 is made of medical silicone. When the telescopic member 222 and the fixing member 223 are fixedly installed, the sealing protrusion 220 can effectively play a sealing and protective role. The sealing protrusion 220 can seal the gap between the telescopic member 222 and the fixing member 223, prevent the infiltration of body fluid, and ensure the sealing effect of the subcutaneous segment.

[0050] See Figures 5-7 As shown, as a preferred technical solution in this embodiment, the outer surface of the telescopic component 222 is smooth. Even though the outer surface of the telescopic component 222 is smooth and anti-adhesive, a biofilm may still form after long-term implantation, affecting sliding or increasing friction. Therefore, an anti-cell adhesion layer (such as a hydrophilic coating or an anti-protein adsorption coating) is coated on the outer surface of the telescopic component 222.

[0051] In the above technical solution, by coating the outer surface of the telescopic component 222 with an anti-cell adhesion layer, the non-specific interaction between the telescopic component 222 and the subcutaneous tissue can be minimized, and the patient's subcutaneous tissue will form a tissue tunnel on the outside of the telescopic component 222. Since the fixation component 223 is fixedly connected to the subcutaneous tissue, when the patient's body grows, it will pull the fixation component 223 apart, so that the telescopic component 222 between the two fixation components 223 can extend freely inside the tissue tunnel, thereby accurately adapting to changes in the patient's body shape.

[0052] See Figure 7 As shown, as a preferred technical solution in this embodiment, the telescopic member 222 has a corrugated structure, and the inner and outer sides of the telescopic member 222 are provided with a protective layer that can be elastically contracted.

[0053] In the above technical solution, the corrugated telescopic component 222 can expand and contract during the traction process, so that the length of the telescopic component 222 can be adjusted as the patient's body grows. The protective layer can make the telescopic component 222 smooth, avoid the exposure of the corrugated structure, and improve the smoothness of the outer surface of the telescopic component 222.

[0054] See Figures 9-10 As shown, in this preferred embodiment, the fixing member 223 has a circular structure and is a rigid biocompatible core material, preferably such as medical-grade titanium alloy, platinum-iridium alloy or PEEK. The fixing member 223 is used to lock and fix two adjacent telescopic members 222.

[0055] In the above technical solution, the fastener 223 can fix and seal two adjacent telescopic members 222, so that the subcutaneous segment has good sealing performance. At the same time, the fastener 223 can be used to provide structural support and conductive path, so that the conductive core wire 23 can pass through.

[0056] See Figure 9 As shown, as a preferred technical solution in this embodiment, an annular groove is provided on the outer side of the fixing member 223, and arc-shaped protrusions are evenly arranged on the annular groove.

[0057] In the above technical solution, the fixation member 223 has an annular groove on the outside, which allows the subcutaneous tissue to extend into the annular groove during growth, increasing the contact area between the fixation member 223 and the subcutaneous tissue. This allows fibroblasts to grow in and form a stable fibrous capsule, enabling the fixation member 223 to be firmly anchored to the subcutaneous tissue. When the patient's body grows, the fixation member 223 can move synchronously with the body skin to increase the distance, thereby pulling the telescopic member 222 inside the tissue tunnel to expand and contract to adapt to growth changes.

[0058] See Figure 9 As shown, as a preferred technical solution of this embodiment, a porous coating is arranged on the gap between two adjacent arc-shaped protrusions on the outer side of the fixing member 223. The porous coating is one of sintered titanium bead layer, porous titanium coating or open-pore silicone.

[0059] In the above technical solution, the porous coating can provide a huge surface area, allowing fibroblasts to grow into the interior of the porous layer structure, thereby further improving the contact strength between the subcutaneous tissue and the fixation member 223 and preventing the fixation member 223 from falling off from the subcutaneous tissue during the patient's body growth.

[0060] See Figures 7-10As shown, in this preferred embodiment, the fixing member 223 has annular grooves at both ends, an arc groove on the inner wall of the annular groove, a locking frame 2231 fixedly installed in the arc groove, and a locking protrusion 2221 corresponding to the locking frame 2231 fixedly installed at the end of the telescopic member 222.

[0061] In the above technical solution, the fastener 223 and the telescopic component 222 are detachable. When it is necessary to increase or decrease the number of fasteners 223 and telescopic components 222, the assembly and fixation are achieved by the plug-in cooperation between the locking protrusion 2221 and the locking bracket 2231. At the same time, the connection between the assembled fastener 223 and the telescopic component 222 is stable and the sealing effect is good.

[0062] See Figure 10 As shown, in this preferred embodiment, the locking frame 2231 has an arc-shaped structure. One end of the locking frame 2231 has a mounting hole 2232, and the other end of the locking frame 2231 has an arc-shaped opening 2233. A sliding groove 2234 is provided in the middle of the locking frame 2231. The thickness of the inner side of the locking frame 2231 gradually increases in the clockwise direction. A positioning groove 2235 is provided on the inner side of the locking frame 2231 near the mounting hole.

[0063] See Figure 7 As shown, in this preferred embodiment, the locking protrusion 2221 has a T-shaped structure. The locking protrusion 2221 includes a connecting rod 2222 and a latch 2223. The connecting rod 2222 is fixedly installed at the end of the sealing protrusion 220. The latch 2223 is installed at the end of the connecting rod 2222. The diameter of the latch 2223 is smaller than that of the arc-shaped opening 2233, and the diameter of the latch 2223 is larger than that of the sliding groove 2234. The connecting rod 2222 can slide along the sliding groove 2234. A positioning protrusion 2224 is fixedly installed on the latch 2223. The surface of the positioning protrusion 2224 is a rough ground surface. The positioning protrusion 2224 is engaged with the positioning groove 2235.

[0064] In the above technical solution, when locking the fastener 223 and the telescopic member 222, the locking protrusion 2221 at the end of the telescopic member 222 is inserted into the locking bracket 2231 on the fastener 223. Specifically, the connecting rod 2222 and the latch 2223 are first inserted into the arc-shaped opening 2233. Then, the telescopic member 222 is turned clockwise, causing the connecting rod 2222 to move along the sliding groove 2234, and the latch 2223 to abut against the inner side of the locking bracket 2231. Since the thickness of the locking bracket 2231 gradually increases in the clockwise direction, the telescopic member 222... As the lever 2222 is gradually turned, the connecting rod 2222 will gradually extend inward, and the gap between the fixing part 223 and the telescopic part 222 will gradually decrease. The sealing protrusion 220 will contact the outer side of the fixing part 223 and gradually press it together. When a "click" is heard, the positioning protrusion 2224 on the latch 2223 will engage with the positioning groove 2235 on the inner side of the locking bracket 2231. The rough grinding surface of the positioning protrusion 2224 can increase the friction, so that the fixing part 223 and the telescopic part 222 are stably connected, which can ensure the tightness of the connection and improve the sealing effect of the connection.

[0065] Based on the above structure, the retractable cardiac pacing electrode provided by the present invention operates according to the following steps:

[0066] S1: Electrode implantation and initial anchoring

[0067] Device connection: Connect the insertion end 21 of the electrode lead 2 to the output port of the pulse pacemaker 1 to establish an electrical path.

[0068] Pathway guidance: The electrode 24 is pushed through a vein (such as the subclavian vein) to the target biological organ (such as the right ventricle of the heart) via the intravenous segment of the flexible connecting cannula 22.

[0069] End fixation: The barbed brace structure (made of polymer material) of the electrode 24 is embedded in the organ tissue to form a mechanical anchor and prevent displacement or detachment.

[0070] Initial state: The subcutaneous telescopic component 222 is in a free, unextended state, with the shortest total length, matching the miniaturized body size requirements of children / teenagers.

[0071] S2: Electrical pulse generation and targeted stimulation

[0072] Signal generation: The control circuit of the pulse pacemaker 1 generates a rectangular pulse current with a pulse width of 0.5-0.6 ms.

[0073] Signal conduction: The current passes sequentially through the insertion end 21 → conductive core wire 23 (the subcutaneous section has a retractable spiral structure) → conductive end of electrode 24.

[0074] Organ stimulation: The conductive tip directly contacts biological organs and tissues, releasing electrical pulses to correct functional disorders (such as abnormal heart rhythm) caused by abnormal electrical signals.

[0075] S3: Dynamic scaling and adaptive growth

[0076] Tissue traction trigger: As the patient's body grows, the tissue of the subclavian subcutaneous sac is stretched, increasing the spacing of the fixation elements 223 anchored to the subcutaneous tissue.

[0077] Mechanical response: The movement of the fixed member 223 pulls on both ends of the adjacent telescopic member 222, and the telescopic member 222 (corrugated tube or cylindrical hollow structure) extends axially within the tissue tunnel, increasing its length; the extension range matches the patient's trunk growth (such as height growth from childhood to adulthood); the intravenous segment remains rigid / moderately flexible, ensuring that the contact position of the electrode 24 within the organ remains unchanged.

[0078] S4: Bio-blocking and Anti-adhesion Maintenance

[0079] Dynamic sealing: The silicone sealing protrusions 220 at both ends of the telescopic component 222 continuously press the interface of the fixing component 223 during extension; the conical structure seals the gap and prevents body fluid from seeping into the subcutaneous cavity.

[0080] Anti-adhesion protection: The outer surface of the telescopic component 222 is coated with a hydrophilic coating / anti-protein adsorption layer to inhibit fibroblast adhesion; reduce biofilm formation, so that the subcutaneous tissue will form a tissue tunnel on the outside of the telescopic component 222, which facilitates the free sliding of the telescopic component 222 in the tissue tunnel.

[0081] S5: Long-term anchoring and electrical integrity

[0082] Tissue integration enhancement: The annular groove and porous coating (sintered titanium beads / open-pore silicone) of the fixation element 223 promote fibroblast ingrowth; forming a fibrous capsule to achieve permanent bio-anchoring.

[0083] Electrical path protection: The spiral telescopic structure of the conductive core wire 23 releases redundant length as the subcutaneous segment extends; avoids bending fatigue and maintains a low-impedance electrical signal conduction path; the external insulation layer (silicone / polyurethane) shields against interference and ensures signal purity.

[0084] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A retractable cardiac pacing electrode, characterized in that, include: A pulse pacemaker (1) and an electrode lead (2). The electrode lead (2) includes an insertion end (21), a connecting sleeve (22), a conductive core wire (23), and an electrode end (24). The insertion end (21), the connecting sleeve (22), and the electrode end (24) are fixedly connected in sequence. The insertion end (21) is inserted into the pulse pacemaker (1). The connecting sleeve (22) drives the electrode end (24) to be inserted into the biological organ. The connecting sleeve (22) is a flexible hollow structure. The connecting sleeve (22) is provided with a conductive core wire (23). The two ends of the conductive core wire (23) are connected to the insertion end (21) and the electrode end (24) respectively. The pulse pacemaker (1) generates a pulse electrical signal and transmits it to the inside of the organ through the electrode end (24). The connecting sleeve (22) includes a subcutaneous segment and an intravenous segment. The subcutaneous segment is a flexible and stretchable structure. The subcutaneous segment is embedded in the skin and can adapt to the growth of the body. The intravenous segment is a flexible but non-stretchable structure. The intravenous segment passes through the vein and extends into the biological organ. The conductive core wire (23) located inside the subcutaneous segment is a stretchable structure. The subcutaneous segment includes a connecting end (221), a telescopic component (222), and a fixing component (223). There are two connecting ends (221), and the telescopic component (222) and the fixing component (223) are evenly arranged between the two connecting ends (221). The telescopic component (222) and the fixing component (223) are arranged alternately. The telescopic component (222) can be extended and bent. An annular groove is provided on the outer side of the fastener (223), and arc-shaped protrusions are evenly arranged on the annular groove; A porous coating is arranged on the gap between two adjacent arc-shaped protrusions on the outer side of the fastener (223). The porous coating is one of sintered titanium beads, porous titanium coating or open-pore silicone.

2. The retractable cardiac pacing electrode according to claim 1, characterized in that: The telescopic component (222) has a cylindrical hollow structure, and sealing protrusions (220) are fixedly installed at both ends of the telescopic component (222). The sealing protrusions (220) have a conical structure.

3. The retractable cardiac pacing electrode according to claim 2, characterized in that: The outer surface of the telescopic component (222) is smooth, and an anti-cell adhesion layer is coated on the outer surface of the telescopic component (222).

4. A retractable cardiac pacing electrode according to claim 3, characterized in that: The telescopic component (222) has a corrugated structure, and the inner and outer sides of the telescopic component (222) are provided with a protective layer that can be elastically contracted.

5. A retractable cardiac pacing electrode according to claim 4, characterized in that: The fixing member (223) has a circular structure and is a rigid biocompatible core material. The fixing member (223) is used to lock and fix two adjacent telescopic members (222).

6. A retractable cardiac pacing electrode according to claim 5, characterized in that: The fixing member (223) has annular grooves at both ends, and an arc groove on the inner wall of the annular groove. A locking frame (2231) is fixedly installed in the arc groove. The telescopic member (222) has a locking protrusion (2221) that corresponds one-to-one with the locking frame (2231) fixedly installed at its end.

7. A retractable cardiac pacing electrode according to claim 6, characterized in that: The locking frame (2231) has an arc-shaped structure. One end of the locking frame (2231) has a mounting hole (2232), and the other end of the locking frame (2231) has an arc-shaped opening (2233). A sliding groove (2234) is provided in the middle of the locking frame (2231). The thickness of the inner side of the locking frame (2231) gradually increases in the clockwise direction. A positioning groove (2235) is provided on the inner side of the locking frame (2231) near the mounting hole.

8. A retractable cardiac pacing electrode according to claim 7, characterized in that: The locking protrusion (2221) has a T-shaped structure. The locking protrusion (2221) includes a connecting rod (2222) and a latch (2223). The connecting rod (2222) is fixedly installed at the end of the sealing protrusion (220). The latch (2223) is installed at the end of the connecting rod (2222). The diameter of the latch (2223) is smaller than that of the arc-shaped opening (2233), and the diameter of the latch (2223) is larger than that of the sliding groove (2234). The connecting rod (2222) can slide along the sliding groove (2234). A positioning protrusion (2224) is fixedly installed on the latch (2223). The surface of the positioning protrusion (2224) is a rough ground surface. The positioning protrusion (2224) is engaged with the positioning groove (2235).

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