CN213249626U

CN213249626U - Special near-end reaming sighting device for PFNA

Info

Publication number: CN213249626U
Application number: CN202021310000.9U
Authority: CN
Inventors: 徐顺利; 王鑫; 张仁芬
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-07-07
Filing date: 2020-07-07
Publication date: 2021-05-25
Anticipated expiration: 2030-07-07

Abstract

A special near-end marrow expanding sighting device for PFNA comprises a cross positioner, a backward extension rod, a side positioning rod and a groove type guide pin limiting rod, wherein the cross positioner consists of a cross positioner angle scale, a cross positioner longitudinal rod and a cross positioner transverse rod; the cross positioner angle scale is characterized in that a through hole penetrating through a longitudinal rod of the cross positioner is processed at the center of the cross positioner angle scale, a cross positioner limiting sleeve used for screwing a threaded hole of a fixing threaded nail is embedded in the through hole positioned on the longitudinal rod of the cross positioner, a strip-shaped slotted hole for the fixing threaded nail to pass through is processed along the axial direction of a transverse rod of the cross positioner, and a groove with a center angle of 6 degrees is processed on the disc surface of the cross positioner angle scale positioned on one side of the longitudinal rod of the cross positioner.

Description

Special near-end reaming sighting device for PFNA

Technical Field

The utility model relates to a medical instrument especially relates to a thighbone near-end reaming sight when fracture is fixed with PFNA between thighbone tuberosity.

Background

The PFNA treatment of femoral intertrochanteric fracture is an accepted, minimally invasive and effective surgical method, but the technical requirement is high, and the position of a proximal nail feeding point directly influences the placement position and the direction of an intramedullary nail, so that the PFNA treatment is a key initial factor for determining success or failure of surgery. However, PFNA sets 6 ° valgus, and the conventional approach and the currently used open positioner, even if the opening is correct, cannot guarantee the correctness of the 6 ° valgus reaming and the proximal anteroposterior position of the bone tunnel. Improper nail feeding point and proximal reaming can cause difficult needle feeding during operation, bone fracture displacement, iatrogenic lateral wall fracture and proximal bone burst; a series of complications such as postoperative distal stress concentration fracture, hip varus deformity, avascular necrosis of the femoral head, ectopic ossification, hip abduction dysfunction, hip-femoral pain, greater trochanteric pain syndrome and the like. The patient is usually required to be adjusted repeatedly under the positive lateral fluoroscopy of X-ray clinically, the operation time is prolonged, and the radiation to doctors and patients is increased.

Disclosure of Invention

The utility model provides a special near-end reaming sighting device for PFNA, which aims to overcome the problems of difficult positioning of the opening point and deflection of the near-end reaming medullary channel in the prior art. The utility model discloses a sight not only can realize the accurate location of opening point, can realize the near-end moreover and expand the accurate matching of marrow way. The central point of the femoral medullary cavity of the inferior border plane of the lesser trochanter can be found through the femur right side dissection force line, and the point is taken as a target point O1. At O1, a cross-positioner is fixed with its longitudinal rod overlapping the femoral orthopedics force line and measuring the distance a to the greater trochanter tip of the femur and its transverse rod extending outward to the outside of the thigh and having a length mark B. The intersection point of a line which is drawn from the point O1 and is everted by 6 degrees with the femoral orthostatic anatomical force line and the femoral greater trochanter is an orthostatic opening point O2, and the distance C between the point and the femoral orthostatic anatomical force line is measured. The side locating rod overlaps with side position thighbone neck axis, is connected with the cross locator through the back extension rod. A groove type guide pin limiting rod is installed on the side positioning rod according to the length A, the depth of the limiting rod penetrating into the notch of the femoral greater trochanter is B-C, and the guide pin is directly drilled into the limiting groove through the 6-degree eversion.

The utility model discloses the technical scheme who adopts as follows:

the utility model discloses a special near-end reaming marrow sighting device of PFNA includes the cross locator that comprises cross locator angle scale, cross locator longitudinal rod, cross locator horizontal pole, the backward extension rod that is connected perpendicularly with the extension end of cross locator horizontal pole through backward extension rod connecting buckle, the side locating lever that is connected with the lower extreme of backward extension rod through circular threaded disc, and the slot type guide pin gag lever post (forming a frame similar to rectangular structure) that is connected perpendicularly with the side locating lever through slot type buckle; the cross positioner longitudinal rod is combined with the cross positioner angle scale in a consolidation mode, a rectangular through hole for penetrating and installing a cross positioner transverse rod is processed on the cross positioner longitudinal rod positioned at the center of the cross positioner angle scale, and the cross positioner transverse rod is penetrated and installed with the rectangular through hole to be combined with the cross positioner longitudinal rod and is fixed and limited through a lateral screw; the cross positioner angle scale is characterized in that a through hole penetrating through a longitudinal rod of the cross positioner is processed in the center of the cross positioner angle scale, a cross positioner limiting sleeve is embedded in the through hole positioned in the longitudinal rod of the cross positioner, a central hole of the cross positioner limiting sleeve is a fixing threaded nail penetrating hole, a strip-shaped groove hole for a fixing threaded nail to pass through is processed in the axial direction of a cross positioner transverse rod, and an arc-shaped groove for placing a 2.0-Kirschner wire and having a central angle of 6 degrees is processed in the scale surface of the cross positioner angle scale positioned on one side of the longitudinal rod of the cross positioner.

Furthermore, the fixing threaded nail is 200mm long, the front end is 50mm and is not threaded, the middle section is 140mm, thread machining is conducted, the tail end is 10mm and is square, and the cross-shaped positioner is fixed through the fixing threaded nail nut.

The dress is worn in the rectangle through-hole that processes out on the section of extending behind the cross locator transverse bar to the extension rod to through carrying on spacing fixedly to extension rod connection buckle, and be provided with the size scale along the axial of back extension rod.

The connecting end of the backward extension rod and the side positioning rod is a circular threaded disc structure with a central threaded hole.

A strip-shaped guide groove for penetrating and installing a groove type guide pin limiting rod is axially processed along the side positioning rod, and dimension scales are arranged along the axial direction of the side positioning rod; the positioning of the groove type guide pin limiting rod is realized through a groove type buckle clamped on the side positioning rod.

The cross section of the groove type guide pin limiting rod is of a rectangular structure, a triangular limiting groove for the kirschner pin to slide into is machined on one surface of the groove type guide pin limiting rod, and the front end of the groove type guide pin limiting rod is of a triangular structure.

The utility model has the advantages as follows:

the utility model discloses a frame of an approximate rectangle structure that four metal poles formed through special buckle connection, all dissect the line of force with the thighbone on the positive side position and overlap, according to X line perspective back measuring numerical value, ke shi needle director through slot type guide pin stopper rod end, can guarantee to use PFNA when treating fracture between the thighbone trochanter, thighbone near-end opening point and expand on the marrow bone way normal position and dissect the line of force with the thighbone normal position and turn up 6, overlap with thighbone neck axis on the side position, intramedullary nail and femoral head neck internal locking nail are put into to the accurate, avoid improper nail feeding point and the oblique near-end to expand a series of complications that the marrow arouses.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic structural view (front view) of the cross positioner.

FIG. 3 is a schematic view (side view) of the cross positioner.

Fig. 4 is a schematic view of the fixing screw.

FIG. 5 is a schematic view of a rearwardly extending rod.

FIG. 6 is a side positioning rod schematic view.

Fig. 7 is a side view of the channel snap of fig. 6.

Fig. 8 shows a guide pin limiting rod.

Number in the figure: 1. a cross locator angle scale; 2. a cross locator longitudinal rod; 3. a cross locator cross bar; 4. a cross locator limit sleeve; 5. the backward extension rod is connected with a buckle; 6. fixing the threaded nail; 7. fixing the threaded nail nut; 8. a backward extension rod; 9. a circular threaded disc; 10. a lateral position locating rod; 11. a groove type buckle; 12. a slot type guide pin limiting rod.

Detailed Description

The invention will be further described with reference to the following examples (drawings):

as shown in fig. 1, the special proximal reaming sight for PFNA of the present invention comprises a cross positioner (see fig. 2) consisting of a cross positioner angle scale 1, a cross positioner longitudinal rod 2 and a cross positioner transverse rod 3, a backward extension rod 8 vertically connected with the extension end of the cross positioner transverse rod through a backward extension rod connecting buckle 5, a lateral positioning rod 10 connected with the lower end of the backward extension rod 8 through a circular thread disc 9, and a groove guide pin limiting rod 12 (forming a frame with an approximate rectangular structure) vertically connected with the lateral positioning rod 10 through a groove buckle 11; the cross positioner longitudinal rod 2 is combined with the cross positioner angle scale 1 in a consolidation mode, a rectangular through hole for penetrating and installing a cross positioner transverse rod 3 is processed on the cross positioner longitudinal rod 2 positioned at the center of the cross positioner angle scale 1, and the cross positioner transverse rod 3 is penetrated and installed with the rectangular through hole to be combined with the cross positioner longitudinal rod 2 and is fixed and limited through a lateral screw; the center of the cross locator angle scale 1 is provided with a through hole which runs through the cross locator longitudinal rod 2, a cross locator limiting sleeve 4 is embedded in the through hole of the cross locator longitudinal rod 2, the center hole of the cross locator limiting sleeve is a fixing threaded nail 6 penetrating hole (see figure 3), a strip-shaped groove hole for the fixing threaded nail to pass through is axially processed along the cross locator transverse rod 3, and a groove for placing a 2.0 Kirschner wire with a center angle of 6 degrees is processed on the disc surface of the cross locator angle scale 1 on one side of the cross locator longitudinal rod 2.

Further, the fixing screw nail is 200mm long, the front end is 50mm and is not threaded, the middle section is 140mm, the thread processing is performed, the tail end is 10mm and is square, and the cross-shaped positioner is fixed through the fixing screw nail nut (see fig. 4).

The back extension rod 8 is penetrated in the rectangular through hole processed on the extension section behind the cross positioner transverse rod 3 and is limited and fixed by the back extension rod connecting buckle 5.

The connecting ends of the backward extension rod 8 and the side positioning rod 10 are both of a circular threaded disc 9 structure with a central threaded hole (see fig. 5 and 6); a strip-shaped guide groove for penetrating and installing a groove type guide pin limiting rod 12 is axially processed along the side positioning rod 10, and the positioning of the groove type guide pin limiting rod 12 is realized by a groove type buckle 11 clamped on the side positioning rod 10 (see fig. 6 and 7); slot type buckle 11 clamps on side locating lever 10 promptly, and rectangular through-hole that the slot type guide pin gag lever post 12 processed respectively on passing the bar guide slot on side locating lever 10 and the slot type buckle 11 both sides cardboard in proper order can carry out the location of slot type guide pin gag lever post 12 through installing at 11 stop screw of slot type buckle when the adjustment of slot type guide pin gag lever post 12 is to suitable position.

The cross section of the groove type guide pin limiting rod 12 is of a rectangular structure, one side of the groove type guide pin limiting rod is provided with a triangular limiting groove for the sliding of the Kirschner wire, and the front end of the groove type guide pin limiting rod is of a triangular structure (see fig. 8).

More specifically, the cross positioner angle scale 1 is circular, has the diameter of 40mm and the thickness of 1mm, and is provided with a 6-degree groove on the top surface for placing a 2.0 Kirschner wire; the cross positioner longitudinal rod 2 is 200mm long, 4mm wide and 4mm thick, a 2mm high and 4mm wide groove is arranged between the cross positioner longitudinal rod and the angle scale, and the cross positioner transverse rod 3 can pass through the groove; the cross positioner transverse rod 3 is 200mm long, 4mm wide and 2mm thick, the far end 10mm section is 6mm wide and 6mm thick, a square hole of 4mm multiplied by 4mm for the backward extension rod to pass through is arranged, and the cross positioner transverse rod is fixed by a lateral screw; the cross positioner limiting sleeve 4 is connected with the cross positioner longitudinal rod 2, the inner diameter is 3.5mm, the outer diameter is 5.5mm, and a threaded nail passes through the cross positioner limiting sleeve (see figures 2 and 3); the fixed screw 6 is 200mm long, the front part is 50mm and has no screw thread, the middle part is 140mm and has screw thread, the tail end is 10mm and has square shape, and the cross positioner can be fixed by the nut 7 (see figure 4).

The length of the backward extension rod 8 is 200mm, the width is 4mm, the thickness is 4mm, the diameter of the far end (tail end) is 10mm, the thickness of the circular threaded disc 9 is 2mm, and a hole with the diameter of 2mm is processed in the center (see figure 5).

Side locating lever 10 long 200mm, the diameter 10mm of nearly section (front end) 10mm length, the circular screw thread dish of 2mm thick, central processing has 2mm diameter hole, fixed with the disc of backward extension rod through the screw, the middle section processing has the bar guide slot, slot type buckle 11 can fix slot type guide pin gag lever post 12 (see fig. 6, 7).

The groove type guide pin limiting rod is 200mm long, the width of the near end is 190mm, the thickness of the near end is 4mm, a limiting groove with the depth of 2mm, the groove width of 3mm and the groove bottom being everted for 6 degrees and the tangent plane being triangular is processed on one surface (bottom surface) and is used for the kirschner pin to slide into. The distal end (end) is a triangular prism, the front is sharp, and the rear is bottom (see fig. 8).

The working principle of the utility model is as follows (see fig. 1):

the patient takes the supine position after anesthesia and applies the traction bed to draw, reset and fix. c, marking a femur orthopaedics dissection force line, the lower edge of the lesser trochanter and a vertical line of the line on the skin by using a marking pen for perspective and orthopaedics of the arm machine, and drawing a plane line of the vertex of the greater trochanter of the femur in parallel with the vertical line; adjusting the perspective side position of the C-arm machine to enable the femoral head, the neck and the stem to be positioned on a same line, and marking the central axis of the femoral head-neck side position. The intersection point of the femur orthopaedics dissection force line and the inferior border of the lesser trochanter and the vertical line of the line is the central point of the femoral medullary cavity of the inferior border plane of the lesser trochanter, and the point is taken as a target point (O1). The cross positioner is placed so that the longitudinal rod of the cross positioner overlaps the femoral orthopedics force line, the distance (A) from the point to the greater trochanter tip of the femur is read through the upper scale, and the transverse rod of the cross positioner is placed so that the outer end of the transverse rod reaches the skin of the outer side of the thigh, and the length (B) of the section is read. The cross positioner is fixed by using a threaded nail, a kirschner wire is placed in a 6-degree groove of an angle scale 1 of the cross positioner, a marking pen is used for drawing a line which is turned outwards by 6 degrees with a femoral normal dissection force line on skin along the kirschner wire, the intersection point of the marking pen and a femoral greater trochanter plane line is a normal opening point (O2), the distance (C) between the point and the femoral normal dissection force line is measured, a side positioning rod is overlapped with a side femoral head and neck central axis, a backward extension rod is connected and locked with the cross positioner, a groove type guide pin limiting rod is installed on the side positioning rod according to the length A, the depth of the groove type guide pin limiting rod penetrating into the femoral greater trochanter notch is B-C, a guide pin is inserted into a sliding groove of the groove type guide pin limiting rod, and a guide pin is drilled into a triangular limiting groove which is turned outwards by 6 degrees.

Claims

1. The near-end marrow expanding sighting device special for PFNA is characterized by comprising a cross positioner, a backward extension rod, a lateral positioning rod and a groove type guide pin limiting rod, wherein the cross positioner consists of a cross positioner angle scale, a cross positioner longitudinal rod and a cross positioner transverse rod; the cross positioner longitudinal rod is combined with the cross positioner angle scale in a consolidation mode, a rectangular through hole for penetrating and installing a cross positioner transverse rod is processed on the cross positioner longitudinal rod positioned at the center of the cross positioner angle scale, and the cross positioner transverse rod is penetrated and installed with the rectangular through hole to be combined with the cross positioner longitudinal rod and is fixed and limited through a lateral screw; the cross positioner angle scale is characterized in that a through hole penetrating through a longitudinal rod of the cross positioner is processed in the center of the cross positioner angle scale, a cross positioner limiting sleeve is embedded in the through hole positioned in the longitudinal rod of the cross positioner, a central hole of the cross positioner limiting sleeve is a fixing threaded nail penetrating hole, a strip-shaped groove hole for a fixing threaded nail to pass through is processed in the axial direction of a cross positioner transverse rod, and a groove for placing a 2.0 Kirschner wire with a central angle of 6 degrees is processed in the disc surface of the cross positioner angle scale positioned on one side of the longitudinal rod of the cross positioner.

2. The special proximal reaming sight for PFNA according to claim 1, wherein the front end of the fixing screw nail has no screw thread, the middle section is threaded, the tail end is square, and the cross-shaped positioner is fixed by the fixing screw nail nut.

3. The special proximal end reaming sight for the PFNA according to claim 1, wherein the backward extending rod is inserted into a rectangular through hole processed on the backward extending section of the cross-shaped locator transverse rod, is limited and fixed by a backward extending rod connecting buckle, and is provided with dimension scales along the axial direction of the backward extending rod.

4. The special proximal end reaming sight for PFNA according to claim 1, wherein the connecting ends of the backward extending rod and the side positioning rod are both circular thread disc structures with central threaded holes.

5. The special near-end reaming sighting device for the PFNA according to claim 1, wherein a strip-shaped guide groove for penetrating and installing a groove type guide pin limiting rod is processed along the axial direction of the side positioning rod, and dimension scales are arranged along the axial direction of the side positioning rod; the positioning of the groove type guide pin limiting rod is realized through a groove type buckle clamped on the side positioning rod.

6. The special proximal reaming sighting device for PFNA according to claim 1, wherein the cross section of the groove type guide pin limiting rod is rectangular, one side of the groove type guide pin limiting rod is provided with a triangular limiting groove for the sliding entry of the Kirschner wire, and the front end of the groove type guide pin limiting rod is triangular.