Guide pin positioning device for forward intramedullary nail for femoral fracture

Abstract

The utility model relates to the technical field of medical instruments, in particular to a femoral fracture consequent intramedullary nail guide needle positioning device which comprises a positioning piece, a sleeve mechanism and a guide needle, the positioning piece is of an annular structure, the shape of an inner cavity of the positioning piece is matched with the shape of an index finger of a medical worker, and a limiting ring is arranged at the bottom of the positioning piece. The inner diameter of the limiting ring is smaller than the outer diameter of the index finger of the medical worker. The sleeve mechanism is of a tubular structure, the lower portion of the outer wall of the sleeve mechanism is connected with the outer wall of the positioning piece, and a guide pin hole for the guide pin to penetrate through is formed in the axial direction of the sleeve mechanism. By means of the positioning piece connected with the sleeve mechanism, when the index finger of a medical worker touches the vertex of greater trochanter, the needle entering point of the guide needle can be positioned, the guide needle is safely positioned at the needle entering point through the bottom end of the sleeve mechanism, the guide needle is guided into the femur through a tool, and the situation that the medical worker is accidentally injured is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a positioning device for an antegrade intramedullary nail guide pin for a femoral fracture. Background Art

[0002] For patients with femoral fractures who require antegrade intramedullary nailing, the following surgical approach is usually used: Depending on the surgeon's preference or the type of fracture, the patient is placed in the supine or lateral position. The affected limb is tractioned and fixed. The healthy limb is extended and lowered, or fixed in a bracket. The affected limb is adducted 10°-15° and aligned with the medullary canal. The healthy side is compared to confirm the length and rotation of the affected limb. Ensure that the C-arm machine has sufficient vision in both the anteroposterior and lateral views, make a longitudinal incision along the anatomical axis of the femur at the proximal end of the greater trochanter, cut the fascia, and the medical staff touch the apex of the greater trochanter with the index finger as the positioning point, and open the bone slightly inside the apex of the greater trochanter (the ideal needle entry point is slightly inside the apex of the greater trochanter, forming a 4° angle with the anatomical axis of the femur in the anteroposterior position and a straight line with the femoral medullary cavity in the lateral position). Then insert the guide needle and penetrate the medullary cavity of the fracture site. After fluoroscopy, confirm that the guide needle is in place, and then use the medullary expansion drill to repeatedly expand the medullary cavity. After expansion, remove the drill and guide needle, and implant the antegrade intramedullary nail. However, since the medical staff needs to touch the apex of the greater trochanter with the index finger as the positioning point, and then use the mouthpiece to open the mouthpiece next to the index finger, the mouthpiece may accidentally injure the index finger of the medical staff, causing infection. In order to reduce the occurrence of the above situation, the incision needs to be enlarged, which prolongs the patient's recovery time.

[0003] Based on the above reasons, the utility model provides a device for positioning a guide pin of an antegrade intramedullary nail for a femoral fracture. Utility Model Content

[0004] The purpose of the utility model is to overcome the deficiencies of the prior art and to provide a guide needle positioning device for an antegrade intramedullary nail of a femoral fracture. Through a positioning piece connected to a sleeve mechanism, medical personnel can locate the insertion point of the guide needle when the index finger touches the apex of the greater trochanter, and safely position the guide needle at the insertion point through the bottom end of the sleeve mechanism. The guide needle is introduced into the femur through a tool, and accidental injury to the medical personnel will not occur.

[0005] In order to achieve the purpose of the utility model, the technical solution adopted by the utility model is:

[0006] The utility model discloses a device for positioning a guide needle for an antegrade intramedullary nail of a femoral fracture, comprising a positioning member, a sleeve mechanism and a guide needle, wherein the positioning member is an annular structure, and the shape of its inner cavity matches the shape of the index finger of a medical staff; a limiting ring is provided at the bottom of the positioning member, and the inner diameter of the limiting ring is smaller than the outer diameter of the index finger of the medical staff; the sleeve mechanism is a tubular structure, and the lower part of its outer wall is connected to the outer wall of the positioning member, and the axial direction of the sleeve mechanism forms a guide needle hole for the guide needle to pass through.

[0007] An angle of 4° is formed between the axis of the sleeve mechanism and the axis of the positioning member.

[0008] The positioning member is in a conical structure with an outer diameter gradually decreasing from top to bottom, and the angle between the side edge and the center line of the longitudinal section is 4°.

[0009] The sleeve mechanism includes a sleeve and a curved section. The lower part of the outer wall of the sleeve is connected to the outer wall of the positioning member. The top of the sleeve mechanism is inclined forward and upward to form the curved section. The bottom end of the curved section is connected to the top of the sleeve. The guide pin hole passes through the top of the sleeve and is connected to the outside.

[0010] The top end of the curved section is connected with a holder, and the holder and the curved section form a "T"-shaped structure.

[0011] The beneficial effects of the utility model are:

[0012] (1) The utility model uses a positioning member connected to the sleeve mechanism to enable medical personnel to locate the insertion point of the guide needle when the index finger touches the apex of the greater trochanter, and safely locate the bottom end of the sleeve mechanism at the insertion point, and guide the guide needle into the femur through the tool, without causing accidental injury to the medical personnel;

[0013] (2) The utility model provides a limiting ring so that when the index finger of the medical staff is inserted into the positioning member, the positioning member can be moved downward along the incision without falling off, and the middle part of the index fingertip of the medical staff can touch the apex of the greater trochanter through the inner ring of the limiting ring;

[0014] (3) The utility model forms a 4° angle between the axis of the sleeve mechanism and the positioning piece. Since the incision is made along the anatomical axis of the femur at the proximal end of the greater trochanter, the medical staff carries the positioning piece with their index finger and moves it downward along the anatomical axis to roughly grind to the apex of the greater trochanter. The bottom end of the sleeve mechanism connected to one side of the positioning piece and forming a 4° angle therewith is the ideal needle insertion point. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model;

[0016] Figure 2It is a cross-sectional schematic diagram of the utility model;

[0017] Figure 3 This is a usage state diagram of the utility model.

[0018] In the figure: 1 positioning member, 2 sleeve mechanism, 3 guide pin, 4 femur, 5 greater trochanter, 6 anatomical axis, 11 limiting ring, 21 guide pin hole, 22 sleeve, 23 curved section, 24 holder. DETAILED DESCRIPTION

[0019] The utility model is further described below:

[0020] See also Figure 1-Figure 3 ,

[0021] The utility model discloses a positioning device for an antegrade intramedullary nail guide pin for a femoral fracture, comprising a positioning member 1, a sleeve mechanism 2 and a guide pin 3. The positioning member 1 is an annular structure, and its inner cavity shape matches the shape of the index finger of a medical staff. A limiting ring 11 is provided at the bottom of the positioning member 1, and the inner diameter of the limiting ring 11 is smaller than the outer diameter of the index finger of the medical staff. The sleeve mechanism 2 is a tubular structure, and the lower part of its outer wall is connected to the outer wall of the positioning member 1. The axial direction of the sleeve mechanism 2 forms a guide pin hole 21 for the guide pin 3 to pass through, and the sleeve mechanism 2 is connected to the outer wall of the positioning member 1. 2. The positioning member 1 connected with the medical staff enables the medical staff to locate the insertion point of the guide needle when the index finger touches the apex of the greater trochanter 5, and safely locate the guide needle at the insertion point through the bottom end of the sleeve mechanism, and guide the guide needle 3 into the femur through the tool, without causing accidental injury to the medical staff; by setting the limiting ring 11, the medical staff can move downward along the incision with the positioning member 1 when the index finger of the medical staff inserts the positioning member 1, and the middle part of the index fingertip of the medical staff can touch the apex of the greater trochanter 5 through the inner circle of the limiting ring 11.

[0022] Furthermore, an angle of 4° is formed between the axis of the sleeve mechanism 2 and the axis of the positioning member 1. Since the incision is made along the anatomical axis 6 of the femur 4 at the proximal end of the greater trochanter 5, the medical staff carries the positioning member 1 with their index finger and moves it downward along the anatomical axis 6 to roughly grind to the apex of the greater trochanter 5. The bottom end of the sleeve mechanism 2 connected to one side of the positioning member 1 and forming an angle of 4° therewith is the ideal needle entry point (located slightly inside the apex of the greater trochanter in the direction of the femoral head, forming an angle of 4° with the anatomical axis 6 of the femur in the anteroposterior position, and forming a straight line with the femoral medullary cavity in the lateral position).

[0023] Furthermore, the positioning member 1 has a conical structure with an outer diameter that gradually decreases from top to bottom, so that the positioning member 1 has an open top, which is convenient for the medical staff to insert their index finger into its inner cavity; the angle between the side of its longitudinal section and the center line is 4°, which is the same as the slope of the sleeve mechanism 2, so that the connection between the sleeve mechanism 2 and the positioning member 1 is more stable and not easy to detach.

[0024] Furthermore, the sleeve mechanism 2 includes a sleeve 22 and a curved section 23. The lower portion of the outer wall of the sleeve 22 is connected to the outer wall of the positioning member 1. The top of the sleeve mechanism 2 is inclined forward and upward to form the curved section 23. The bottom end of the curved section 23 is connected to the top of the sleeve 22. The guide needle hole 21 passes through the top of the sleeve 22 and is connected to the outside. When the medical staff needs to introduce the guide needle 3, they need to hold the top of the sleeve mechanism 2, which may cause the guide needle 3 to accidentally injure the medical staff. By providing the curved section 23, the medical staff can safely hold the sleeve mechanism 2 when the guide needle 3 is introduced into the femur. The curved section 23 bends forward and upward and will not be blocked by the patient's body.

[0025] Furthermore, a holder 24 is connected to the top of the curved section 23, and the holder 24 and the curved section 23 form a "T"-shaped structure, so that after positioning is completed, the medical staff holds the holder 24 to stably position the bottom end of the sleeve mechanism 2 at the needle insertion point, and holding the holder 24 makes the sleeve mechanism 2 more stable, which facilitates the introduction of the guide needle 3.

[0026] Operation process: When the operation begins, a longitudinal incision is made along the anatomical axis 6 of the femur 4 at the proximal end of the greater trochanter 5, the fascia is cut, and the medical staff inserts the index finger into the inner cavity of the positioning member 1. The index finger carrying the positioning member 1 moves downward along the incision. After the middle part of the index fingertip contacts the top of the greater trochanter 5 through the inner circle of the limiting ring 11, the bottom end of the sleeve mechanism 2 connected to the positioning member 1 is the ideal needle entry point.

[0027] The above description is only an embodiment of the present utility model, and does not limit the patent scope of the present utility model. Any equivalent transformation made by using the contents of the specification and drawings of the present utility model or directly or indirectly applied in the relevant technical field is also included in the patent protection scope of the present utility model.

Claims

1. A device for positioning a guide pin for an antegrade intramedullary nail of a femoral fracture, characterized in that: It comprises a positioning member (1), a sleeve mechanism (2) and a guide needle (3). The positioning member (1) is an annular structure, and the shape of its inner cavity matches the shape of the medical staff's index finger. A limiting ring (11) is provided at the bottom of the positioning member (1). The inner diameter of the limiting ring (11) is smaller than the outer diameter of the medical staff's index finger, so that the middle part of the tip of the medical staff's index finger can touch the apex of the greater trochanter (5) through the inner ring of the limiting ring (11); The sleeve mechanism (2) is a tubular structure, the lower part of the outer wall of which is connected to the outer wall of the positioning member (1), and the axial direction of the sleeve mechanism (2) forms a guide needle hole (21) for the guide needle (3) to pass through.

2. The device for positioning a guide pin for an antegrade intramedullary nail for a femoral fracture according to claim 1, characterized in that: An included angle of 4° is formed between the axis of the sleeve mechanism (2) and the axis of the positioning member (1).

3. The device for positioning a guide pin for an antegrade intramedullary nail for a femoral fracture according to claim 2, characterized in that: The positioning member (1) has a conical structure with an outer diameter that gradually decreases from top to bottom, and the angle between the side edge and the center line of its longitudinal section is 4°.

4. The device for positioning a guide pin for an antegrade intramedullary nail for a femoral fracture according to claim 1, characterized in that: The sleeve mechanism (2) comprises a sleeve (22) and a curved section (23); the outer wall of the sleeve (22) is connected to the outer wall of the positioning member (1) at its lower part; the top end of the sleeve mechanism (2) is inclined forward and upward to form the curved section (23); the bottom end of the curved section (23) is connected to the top end of the sleeve (22); and the guide needle hole (21) passes through the top of the sleeve (22) and is in communication with the outside.

5. The device for positioning a guide pin for an antegrade intramedullary nail for a femoral fracture according to claim 4, characterized in that: The top end of the curved section (23) is connected to a holder (24), and the holder (24) and the curved section (23) form a "T"-shaped structure.

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