Dynamic tracking needle

Abstract

The present invention belongs to the technical field of medical devices, and specifically relates to a dynamic tracking needle, including a positioning needle, a positioning sensor arranged at the front end of the positioning needle, and a holding rod for fixing the positioning needle; the holding rod includes a shell and two clamping arms that can be pressed, and the positioning needle includes a locking slot; the locking slot extends into the shell and is buckled with the clamping arm. After the positioning needle embedded with an electromagnetic sensor is inserted into the bone by adopting this solution, the holding rod and the positioning needle can be disassembled, and only the positioning needle is left on the bone, which ensures accurate positioning of the bone while reducing the burden on the bone. In addition, the positioning needle is small in size and can reduce interference with the surgical process. In this solution, the buckled limiting protrusions and locking slots can be unlocked by pressing the rear ends of the two clamping arms with one hand, which is easy to operate. In addition, when pressing the clamping arm, the direction of the applied pressure is perpendicular to the direction of the axis of the positioning needle, which will not affect the depth of the positioning needle inserted into the bone.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, and in particular to a dynamic tracking needle. Background Art

[0002] During orthopedic surgery, since the skeleton is composed of many bones and each bone will undergo slight position changes during the operation, the surgical accuracy is poor, which seriously affects the treatment effect.

[0003] Therefore, it is urgent to design a dynamic tracking needle that can accurately locate bones to ensure the accuracy of the surgery. Summary of the invention

[0004] In view of the above problems, the present invention provides a dynamic tracking needle.

[0005] The scheme of the present invention is as follows:

[0006] A dynamic tracking needle, comprising:

[0007] Positioning pins, bound to bones;

[0008] The positioning sensor is arranged at the front end of the positioning needle.

[0009] Preferably, it also includes a holding rod for fixing the positioning needle;

[0010] The gripping rod comprises: a housing;

[0011] a clamping arm rotatably fixed to the housing;

[0012] The elastic member pushes the clamping arm to clamp the positioning pin.

[0013] Preferably, the clamping arm is arranged on both sides of the shell; the clamping arm is strip-shaped, and a clamping protrusion for clamping the positioning needle is provided at the front end of the clamping arm; the middle part of the clamping arm is hinged on the shell; the rear end of the clamping arm abuts against the shell through the elastic member.

[0014] Preferably, the positioning needle comprises a needle body and a clamping portion provided at the rear end of the needle body;

[0015] The clamping portion includes a cylindrical clamping body and a locking slot provided on an outer side wall of the clamping body; the locking slot is buckled with the clamping protrusion.

[0016] Preferably, the elastic member is a reset spring; a positioning protrusion is provided at the rear end of the clamping arm; and the reset spring is sleeved on the positioning protrusion.

[0017] Preferably, a mounting hole is provided at the front end of the housing for the locking slot to extend into the housing; the mounting hole comprises a first through hole and a second through hole distributed front to back; the first through hole cooperates with the second through hole to form a stepped hole with a larger front and a smaller rear; a stepped surface is formed at the connection between the first through hole and the second through hole;

[0018] The front end of the clamping body is also provided with a limiting shoulder; the limiting shoulder abuts against the step surface in the step hole.

[0019] Preferably, the diameter of the first through hole is slightly larger than the diameter of the positioning shoulder; and the diameter of the second through hole is matched to the diameter of the clamping body.

[0020] Preferably, the rear end of the shell includes a striking platform formed by a flat end surface.

[0021] Preferably, the positioning sensor is an electromagnetic sensor embedded in the positioning needle.

[0022] Preferably, the electromagnetic sensor is connected to a wiring harness for transmitting signals; a wire groove for avoiding the wiring harness is provided on the side wall of the shell; and a notch of the wire groove is formed on the front end surface of the shell.

[0023] By adopting the technical solution of the present invention, during the operation, the positioning needle is inserted into the bone so that the positioning needle is bound to the bone. The position of the bone can be accurately located by using the electromagnetic sensor at the front end of the positioning needle, thereby ensuring the accuracy of the operation. Furthermore, after the positioning needle is bound to the bone, the positioning needle can be separated from the holding rod, and only the positioning needle is left on the bone, which can ensure accurate positioning of the bone while reducing the burden on the bone. Furthermore, the positioning needle is small in size, which can reduce interference with the surgical process. This solution can unlock the buckled limiting protrusion and locking slot by pressing the rear ends of the two clamping arms with one hand, which is easy to operate. Furthermore, when pressing the clamping arm, the direction of the applied pressure is perpendicular to the direction of the axis of the positioning needle, which will not affect the depth of the positioning needle inserted into the bone. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of the explosion structure of the dynamic tracking needle;

[0025] Figure 2 It is a schematic diagram of the cross-sectional structure of the dynamic tracking needle;

[0026] Figure 3 is a schematic diagram of the structure of the positioning needle;

[0027] Figure 4 is a schematic diagram of the cross-sectional structure of the grip rod;

[0028] Figure 5 is a schematic diagram of the structure of the shell;

[0029] Figure 6 Schematic diagram of the structure of the clamping arm.

[0030] In the figure, the shell 1, the mounting hole 11, the first through hole 111, the second through hole 112, the step surface 113, the avoidance hole 12, the wire groove 13, the knocking platform 14, the block 15, the clamping arm 2, the clamping protrusion 21, the hinge seat 22, the hinge hole 221, the positioning protrusion 23, the needle body 3, the spike portion 31, the clamping portion 32, the limit shoulder 321, the locking slot 322, the clamping body 323, the electromagnetic sensor 4, the reset spring 5, the pin shaft 6, and the wiring harness 7. DETAILED DESCRIPTION

[0031] The following is a further detailed description through specific implementation methods:

[0032] In this embodiment, the directional words about "front end" and "front" refer to the direction of the dynamic tracking needle toward the bone, and the directional words about "rear end" and "back" refer to the direction of the dynamic tracking needle away from the bone.

[0033] like Figure 1 and Figure 2 As shown, a dynamic tracking needle includes a positioning needle and a holding rod. The positioning needle includes a rod-shaped needle body 3, a spike portion 31 located at the front end of the needle body 3, and a clamping portion 32 located at the rear end of the needle body 3. The spike portion 31 is composed of three intersecting planes at the front end of the needle body 3. The three planes make the front end of the needle body 3 sharp, which facilitates the front end of the needle body 3 to extend into the bone.

[0034] In this embodiment, the positioning pin is detachably fixed to the front end of the holding rod through the clamping portion 32. Figure 3 As shown, the clamping portion 32 includes a cylindrical clamping body 323, a limiting shoulder 321 and a locking groove 322; the clamping body 323 is coaxial with the needle body 3, and the diameter of the clamping body 323 is larger than the diameter of the needle body 3. The limiting shoulder 321 is formed at the front end of the clamping body 323 and protrudes from the side wall of the clamping body 323. The locking groove 322 is an annular groove provided on the clamping body 323; the locking groove 322 is close to the rear end of the clamping body 323.

[0035] In this embodiment, the needle body 3 is embedded with an electromagnetic sensor 4 for positioning. Taking spinal surgery as an example, during the operation, the positioning needle is nailed into a single vertebra to be operated on, so that the positioning needle is bound to the vertebra, and the spatial position of the electromagnetic sensor 4 in the needle body 3 is captured to accurately determine the spatial situation of the vertebra. During surgery, it is usually necessary to bind two or more vertebrae. The electromagnetic sensor 4 can track the spatial position and relative position changes of the bound vertebrae to guide the doctor to perform surgery accurately. It should be noted that the positioning needle of this scheme is not limited to the spinal surgery recorded in this embodiment, but is also suitable for all orthopedic surgeries such as cervical spine, thoracic spine, joints, etc. that require accurate positioning of the spatial position of bones or tracking of relative position changes of bones.

[0036] When puncturing a bone, the positioning needle at the front end of the holding rod is inserted into the bone by knocking the holding rod, and the electromagnetic sensor 4 in the needle body 3 can accurately capture the position of the bone bound thereto, which is convenient for medical staff to perform precise surgery and can improve the treatment effect. The operation of inserting the positioning needle into the bone by knocking the holding rod is simple, and it can also avoid direct force on the positioning needle and reduce the risk of damage to the electromagnetic sensor 4. After the positioning needle is inserted into the bone, the holding rod can be removed, which can reduce the gravity borne by the bone and the burden on the bone. In addition, the positioning needle is small in size, which can reduce interference with the surgery.

[0037] In this embodiment, a blind hole is provided on the end surface of the rear end of the clamping body 323, and the blind hole makes the positioning needle hollow, and the bottom surface of the blind hole extends into the needle body 3 and is close to the position of the spike portion 31, and the electromagnetic sensor 4 is fixed on the bottom surface of the blind hole. Since the electromagnetic sensor 4 is installed at a position close to the spike portion 31, when the positioning needle pierces the bone, the distance between the electromagnetic sensor 4 and the cone bone is close, which can further ensure the accuracy of positioning.

[0038] In this embodiment, the electromagnetic sensor 4 preferably uses a six-degree-of-freedom electromagnetic sensor 4, which has more comprehensive spatial information and more accurate positioning. The electromagnetic sensor 4 is electrically connected to the wire harness 7 inserted into the blind hole, and the electromagnetic sensor 4 transmits a position signal through the wire harness 7. In some embodiments, existing common positioning methods such as reflected ultrasonic waves can also be used to achieve positioning.

[0039] like Figure 4 and Figure 5 As shown, the gripping rod in this embodiment includes a housing 1 and two clamping arms 2 for fixing the positioning pin. The housing 1 is cylindrical, and the front end of the housing 1 includes a mounting hole 11 for mounting the clamping portion 32; the two sides of the housing 1 are provided with avoidance holes 12 for mounting the clamping arms 2; the rear end of the housing 1 includes a striking platform 14 formed by a flat end surface; the rear end of the housing 1 also includes a stopper 15 formed by protruding inwards; the stopper 15 is located between the two avoidance holes 12.

[0040] In this embodiment, the mounting hole 11 includes a first through hole 111 and a second through hole 112 distributed front to back; the first through hole 111 and the second through hole 112 form a stepped hole that is larger in the front and smaller in the back; a stepped surface 113 is formed at the connection between the first through hole 111 and the second through hole 112. It can be understood that in this embodiment, the aperture of the first through hole 111 is larger than the aperture of the second through hole 112, and the stepped surface 113 is the portion of the second through hole 112 covering the first through hole 111, that is, the transition surface between the first through hole 111 and the second through hole 112.

[0041] In this embodiment, the diameter of the first through hole 111 is slightly larger than the diameter of the limiting shoulder 321. The limiting shoulder 321 is located in the first through hole 111 and abuts against the step surface 113. The diameter of the second through hole 112 is adapted to the diameter of the clamping body 323 to prevent the clamping body 323 from shaking radially in the second through hole 112. The locking slot 322 on the clamping body 323 can pass through the first through hole 111 and the second through hole 112 in sequence and extend into the interior of the housing 1. The two clamping arms 2 are buckled with the positioning pins through the locking slot 322.

[0042] The limiting shoulder 321 in this embodiment abuts against the step surface 113, which can not only limit the positioning needle to prevent the positioning needle from extending too deeply into the shell 1; but also, when the holding rod is knocked, the shell 1 can provide axial thrust for the positioning needle through the step surface 113 and the limiting shoulder 321, so that the positioning needle can easily penetrate the bone.

[0043] like Figure 6 As shown, in this embodiment, two clamping arms 2 are relatively installed in the avoidance holes 12 on both sides of the housing 1. The clamping arms 2 are strip-shaped, with a clamping protrusion 21 at the front end of the clamping arm 2, a hinge seat 22 formed in the middle of the clamping arm 2, and a positioning protrusion 23 at the rear end of the clamping arm 2. The hinge seat 22 is a protrusion formed in the middle of the clamping arm 2; a hinge hole 221 is formed on the hinge seat 22, and a pin 6 is passed through the hinge hole 221 to hinge the clamping arm 2 to the housing 1. Through holes are formed on both sides of the avoidance hole 12 of the housing 1, and both ends of the pin 6 are fixed in the through holes.

[0044] In this embodiment, when the limiting shoulder 321 on the positioning pin abuts against the step surface 113 on the housing 1, the clamping protrusions 21 at the front ends of the two clamping arms 2 can be buckled into the locking slot 322 to fix the positioning pin. The mounting hole 11 on the gripping rod and the clamping portion 32 of the clamping arm 2 and the positioning pin cooperate with each other to limit the axial movement and circumferential rotation of the positioning pin, thereby ensuring that the positioning pin is firmly fixed. A reset spring 5 is sleeved on the positioning protrusions 23 at the rear ends of the two clamping arms 2, one end of the reset spring 5 abuts against the rear end of the clamping arm 2, and the other end abuts against the stopper 15 in the housing 1. The reset spring 5 pushes the rear ends of the two clamping arms 2 to open each other, so that the front ends of the clamping arms 2 are close to each other, and the clamping protrusions 21 at the front ends of the clamping arms 2 are buckled into the locking slot 322. During operation, the gripping rod is held and the buckled limiting protrusions and the locking slot 322 can be unlocked by pressing the rear ends of the two clamping arms 2 with two fingers. The positioning needle of the gripping rod can be separated by one hand, which is easy to operate. In addition, when pressing the clamping arm 2, the direction of applying pressure is perpendicular to the direction of the axis of the positioning needle, which will not affect the depth of the positioning needle penetrating into the bone.

[0045] The return spring 5 in this embodiment is preferably a conical helical spring, which can adapt to the nonlinear displacement of the rear end of the clamping arm 2. The return spring 5 is sleeved on the positioning protrusion 23 to prevent the return spring 5 from slipping. In some embodiments, the return spring can be replaced by common elastic parts such as spring sheets and elastic rubber.

[0046] In this embodiment, a wire groove 13 is further provided on the side wall of the housing 1. The wire groove 13 allows the wire harness 7 to pass through the housing 1 and connect with the electromagnetic sensor 4 in the positioning pin. The notch of the wire groove 13 is provided on the front end surface of the housing 1. When the gripping rod and the positioning pin are separated, the wire harness 7 can directly leave the wire groove 13 from the notch of the wire groove 13 to avoid interference between the wire harness 7 and the housing 1.

[0047] When installing the positioning pin and the holding rod, first apply pressure to the rear ends of the two clamping arms 2 so that the rear ends of the two clamping arms 2 are close to each other and the front ends of the two clamping arms 2 are opened; then put the clamping portion 32 of the positioning pin into the mounting hole 11, and when the limiting shoulder 321 abuts against the step surface 113, the locking groove 322 on the clamping portion 32 is located between the clamping protrusions 21 at the front ends of the two clamping arms 2. Then, the pressure on the rear ends of the two clamping arms 2 is removed, and the two clamping arms 2 are pushed away from each other by the reset spring 5, so that the front ends of the two clamping arms 2 are close to each other, and the clamping protrusions 21 at the front ends of the two clamping arms 2 are engaged with the locking groove 322, and the positioning pin is fixed to the housing 1.

[0048] When puncturing a bone, first hold the gripping rod with one hand and place the positioning needle at the position to be inserted; then knock the knocking platform 14 at the rear end of the gripping rod, and the gripping rod transmits axial thrust to the positioning needle through the step surface 113 at the front end of the housing 1 and the limiting shoulder 321 on the clamping part, so that the positioning needle can easily penetrate into the bone and bind to the bone. The operation of inserting the positioning needle into the bone by knocking the gripping rod is simple, and it can also prevent the positioning needle from being directly subjected to force, reducing the risk of damage to the sensor in the needle body 3.

[0049] After the positioning needle is inserted into the bone, two fingers are used to apply pressure to the rear ends of the two clamping arms 2 respectively, so that the rear ends of the two clamping arms 2 overcome the thrust of the reset spring 5 and move closer to each other; the front ends of the two clamping arms 2 are opened, the clamping protrusions 21 and the locking slots 322 are unlocked, and the gripping rod and the positioning needle are separated, leaving only the positioning needle with the electromagnetic sensor 4 bound to the bone. After the gripping rod is removed, the gravity on the bone can be reduced, the burden on the bone can be reduced, and the positioning needle is small in size, which can reduce interference with the surgery.

[0050] During the subsequent operation, the doctor can accurately locate the position of the bone based on the electromagnetic sensor 4 in the positioning needle to ensure the treatment effect.

[0051] The present invention is not limited to what is described in the specification and implementation modes, and therefore additional advantages and modifications can be easily realized by those skilled in the art. Therefore, without departing from the spirit and scope of the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details, representative devices, and illustrative examples shown and described herein.

Claims

1. A dynamic tracking needle, characterized in that: include: Positioning pins, bound to bones; A positioning sensor, arranged at the front end of the positioning needle; Also included is a holding rod for fixing the positioning needle; The gripping rod comprises: a housing; a clamping arm rotatably fixed to the housing; An elastic member, pushing the clamping arm to clamp the positioning pin; The clamping arms are arranged on both sides of the housing; the clamping arms are strip-shaped, and a clamping protrusion for clamping the positioning pin is arranged at the front end of the clamping arms; the middle part of the clamping arms is hinged on the housing; the rear end of the clamping arms abuts against the housing through the elastic member; The positioning needle comprises a needle body and a clamping portion arranged at the rear end of the needle body; The clamping portion includes a cylindrical clamping body and a locking slot provided on an outer side wall of the clamping body; the locking slot is buckled with the clamping protrusion; The elastic member is a reset spring; a positioning protrusion is provided at the rear end of the clamping arm; the reset spring is sleeved on the positioning protrusion; The front end of the housing is provided with a mounting hole for the locking slot to extend into the housing; the mounting hole includes a first through hole and a second through hole distributed front to back; the first through hole cooperates with the second through hole to form a stepped hole with a larger front and a smaller rear; a stepped surface is formed at the connection between the first through hole and the second through hole; The front end of the clamping body is provided with a limiting shoulder; the limiting shoulder abuts against the step surface in the step hole; A blind hole is provided on the end surface of the rear end of the clamping body, the bottom surface of the blind hole extends into the needle body and is close to the spike portion at the front end of the needle body, and the positioning sensor is fixed on the bottom surface of the blind hole.

2. The dynamic tracking needle according to claim 1, characterized in that: The diameter of the first through hole is slightly larger than the diameter of the limiting shoulder; and the diameter of the second through hole is matched with the diameter of the clamping body.

3. The dynamic tracking needle according to claim 2, characterized in that: The rear end of the shell includes a striking platform formed by a flat end surface.

4. The dynamic tracking needle according to claim 3, characterized in that: The positioning sensor is an electromagnetic sensor embedded in the positioning needle.

5. The dynamic tracking needle according to claim 4, characterized in that: The electromagnetic sensor is connected to a wire harness for transmitting signals; a wire groove for avoiding the wire harness is provided on the side wall of the shell; and a notch of the wire groove is formed on the front end surface of the shell.

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